Update SabreDAV to 1.7.1

102 files changed, 4658 insertions, 4502 deletions

diff --git a/3rdparty/Sabre/CalDAV/Backend/Abstract.php b/3rdparty/Sabre/CalDAV/Backend/Abstract.php
index 7aba1d69ffe..88e5b4a1a07 100755
--- a/3rdparty/Sabre/CalDAV/Backend/Abstract.php
+++ b/3rdparty/Sabre/CalDAV/Backend/Abstract.php
@@ -1,47 +1,19 @@
 <?php
 
+use Sabre\VObject;
+
 /**
  * Abstract Calendaring backend. Extend this class to create your own backends.
  *
+ * Checkout the BackendInterface for all the methods that must be implemented.
+ *
  * @package Sabre
  * @subpackage CalDAV
  * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/) 
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
  */
-abstract class Sabre_CalDAV_Backend_Abstract {
-
-    /**
-     * Returns a list of calendars for a principal.
-     *
-     * Every project is an array with the following keys:
-     *  * id, a unique id that will be used by other functions to modify the
-     *    calendar. This can be the same as the uri or a database key.
-     *  * uri, which the basename of the uri with which the calendar is
-     *    accessed.
-     *  * principaluri. The owner of the calendar. Almost always the same as
-     *    principalUri passed to this method.
-     *
-     * Furthermore it can contain webdav properties in clark notation. A very
-     * common one is '{DAV:}displayname'.
-     *
-     * @param string $principalUri
-     * @return array
-     */
-    abstract function getCalendarsForUser($principalUri);
-
-    /**
-     * Creates a new calendar for a principal.
-     *
-     * If the creation was a success, an id must be returned that can be used to reference
-     * this calendar in other methods, such as updateCalendar.
-     *
-     * @param string $principalUri
-     * @param string $calendarUri
-     * @param array $properties
-     * @return void
-     */
-    abstract function createCalendar($principalUri,$calendarUri,array $properties);
+abstract class Sabre_CalDAV_Backend_Abstract implements Sabre_CalDAV_Backend_BackendInterface {
 
     /**
      * Updates properties for a calendar.
@@ -75,7 +47,7 @@ abstract class Sabre_CalDAV_Backend_Abstract {
      * (403 Forbidden), which in turn also caused {DAV:}owner to fail
      * (424 Failed Dependency) because the request needs to be atomic.
      *
-     * @param string $calendarId
+     * @param mixed $calendarId
      * @param array $mutations
      * @return bool|array
      */
@@ -86,83 +58,97 @@ abstract class Sabre_CalDAV_Backend_Abstract {
     }
 
     /**
-     * Delete a calendar and all it's objects
+     * Performs a calendar-query on the contents of this calendar.
      *
-     * @param string $calendarId
-     * @return void
-     */
-    abstract function deleteCalendar($calendarId);
-
-    /**
-     * Returns all calendar objects within a calendar.
-     *
-     * Every item contains an array with the following keys:
-     *   * id - unique identifier which will be used for subsequent updates
-     *   * calendardata - The iCalendar-compatible calendar data
-     *   * uri - a unique key which will be used to construct the uri. This can be any arbitrary string.
-     *   * lastmodified - a timestamp of the last modification time
-     *   * etag - An arbitrary string, surrounded by double-quotes. (e.g.:
-     *   '  "abcdef"')
-     *   * calendarid - The calendarid as it was passed to this function.
-     *   * size - The size of the calendar objects, in bytes.
-     *
-     * Note that the etag is optional, but it's highly encouraged to return for
-     * speed reasons.
-     *
-     * The calendardata is also optional. If it's not returned
-     * 'getCalendarObject' will be called later, which *is* expected to return
-     * calendardata.
-     *
-     * If neither etag or size are specified, the calendardata will be
-     * used/fetched to determine these numbers. If both are specified the
-     * amount of times this is needed is reduced by a great degree.
-     *
-     * @param string $calendarId
-     * @return array
-     */
-    abstract function getCalendarObjects($calendarId);
-
-    /**
-     * Returns information from a single calendar object, based on it's object
-     * uri.
+     * The calendar-query is defined in RFC4791 : CalDAV. Using the
+     * calendar-query it is possible for a client to request a specific set of
+     * object, based on contents of iCalendar properties, date-ranges and
+     * iCalendar component types (VTODO, VEVENT).
+     *
+     * This method should just return a list of (relative) urls that match this
+     * query.
+     *
+     * The list of filters are specified as an array. The exact array is
+     * documented by Sabre_CalDAV_CalendarQueryParser.
+     *
+     * Note that it is extremely likely that getCalendarObject for every path
+     * returned from this method will be called almost immediately after. You
+     * may want to anticipate this to speed up these requests.
      *
-     * The returned array must have the same keys as getCalendarObjects. The
-     * 'calendardata' object is required here though, while it's not required
-     * for getCalendarObjects.
+     * This method provides a default implementation, which parses *all* the
+     * iCalendar objects in the specified calendar.
      *
-     * @param string $calendarId
-     * @param string $objectUri
+     * This default may well be good enough for personal use, and calendars
+     * that aren't very large. But if you anticipate high usage, big calendars
+     * or high loads, you are strongly adviced to optimize certain paths.
+     *
+     * The best way to do so is override this method and to optimize
+     * specifically for 'common filters'.
+     *
+     * Requests that are extremely common are:
+     *   * requests for just VEVENTS
+     *   * requests for just VTODO
+     *   * requests with a time-range-filter on either VEVENT or VTODO.
+     *
+     * ..and combinations of these requests. It may not be worth it to try to
+     * handle every possible situation and just rely on the (relatively
+     * easy to use) CalendarQueryValidator to handle the rest.
+     *
+     * Note that especially time-range-filters may be difficult to parse. A
+     * time-range filter specified on a VEVENT must for instance also handle
+     * recurrence rules correctly.
+     * A good example of how to interprete all these filters can also simply
+     * be found in Sabre_CalDAV_CalendarQueryFilter. This class is as correct
+     * as possible, so it gives you a good idea on what type of stuff you need
+     * to think of.
+     *
+     * @param mixed $calendarId
+     * @param array $filters
      * @return array
      */
-    abstract function getCalendarObject($calendarId,$objectUri);
+    public function calendarQuery($calendarId, array $filters) {
 
-    /**
-     * Creates a new calendar object.
-     *
-     * @param string $calendarId
-     * @param string $objectUri
-     * @param string $calendarData
-     * @return void
-     */
-    abstract function createCalendarObject($calendarId,$objectUri,$calendarData);
+        $result = array();
+        $objects = $this->getCalendarObjects($calendarId);
 
-    /**
-     * Updates an existing calendarobject, based on it's uri.
-     *
-     * @param string $calendarId
-     * @param string $objectUri
-     * @param string $calendarData
-     * @return void
-     */
-    abstract function updateCalendarObject($calendarId,$objectUri,$calendarData);
+        $validator = new Sabre_CalDAV_CalendarQueryValidator();
+
+        foreach($objects as $object) {
+
+            if ($this->validateFilterForObject($object, $filters)) {
+                $result[] = $object['uri'];
+            }
+
+        }
+
+        return $result;
+
+    }
 
     /**
-     * Deletes an existing calendar object.
+     * This method validates if a filters (as passed to calendarQuery) matches
+     * the given object.
      *
-     * @param string $calendarId
-     * @param string $objectUri
-     * @return void
+     * @param array $object
+     * @param array $filter
+     * @return bool
      */
-    abstract function deleteCalendarObject($calendarId,$objectUri);
+    protected function validateFilterForObject(array $object, array $filters) {
+
+        // Unfortunately, setting the 'calendardata' here is optional. If
+        // it was excluded, we actually need another call to get this as
+        // well.
+        if (!isset($object['calendardata'])) {
+            $object = $this->getCalendarObject($object['calendarid'], $object['uri']);
+        }
+
+        $data = is_resource($object['calendardata'])?stream_get_contents($object['calendardata']):$object['calendardata'];
+        $vObject = VObject\Reader::read($data);
+
+        $validator = new Sabre_CalDAV_CalendarQueryValidator();
+        return $validator->validate($vObject, $filters);
+
+    }
+
 
 }
diff --git a/3rdparty/Sabre/CalDAV/Backend/BackendInterface.php b/3rdparty/Sabre/CalDAV/Backend/BackendInterface.php
new file mode 100755
index 00000000000..881538ab60e
--- /dev/null
+++ b/3rdparty/Sabre/CalDAV/Backend/BackendInterface.php
@@ -0,0 +1,231 @@
+<?php
+
+/**
+ * Every CalDAV backend must at least implement this interface.
+ * 
+ * @package Sabre
+ * @subpackage CalDAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/) 
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+interface Sabre_CalDAV_Backend_BackendInterface {
+
+    /**
+     * Returns a list of calendars for a principal.
+     *
+     * Every project is an array with the following keys:
+     *  * id, a unique id that will be used by other functions to modify the
+     *    calendar. This can be the same as the uri or a database key.
+     *  * uri, which the basename of the uri with which the calendar is
+     *    accessed.
+     *  * principaluri. The owner of the calendar. Almost always the same as
+     *    principalUri passed to this method.
+     *
+     * Furthermore it can contain webdav properties in clark notation. A very
+     * common one is '{DAV:}displayname'.
+     *
+     * @param string $principalUri
+     * @return array
+     */
+    public function getCalendarsForUser($principalUri);
+
+    /**
+     * Creates a new calendar for a principal.
+     *
+     * If the creation was a success, an id must be returned that can be used to reference
+     * this calendar in other methods, such as updateCalendar.
+     *
+     * @param string $principalUri
+     * @param string $calendarUri
+     * @param array $properties
+     * @return void
+     */
+    public function createCalendar($principalUri,$calendarUri,array $properties);
+
+    /**
+     * Updates properties for a calendar.
+     *
+     * The mutations array uses the propertyName in clark-notation as key,
+     * and the array value for the property value. In the case a property
+     * should be deleted, the property value will be null.
+     *
+     * This method must be atomic. If one property cannot be changed, the
+     * entire operation must fail.
+     *
+     * If the operation was successful, true can be returned.
+     * If the operation failed, false can be returned.
+     *
+     * Deletion of a non-existent property is always successful.
+     *
+     * Lastly, it is optional to return detailed information about any
+     * failures. In this case an array should be returned with the following
+     * structure:
+     *
+     * array(
+     *   403 => array(
+     *      '{DAV:}displayname' => null,
+     *   ),
+     *   424 => array(
+     *      '{DAV:}owner' => null,
+     *   )
+     * )
+     *
+     * In this example it was forbidden to update {DAV:}displayname.
+     * (403 Forbidden), which in turn also caused {DAV:}owner to fail
+     * (424 Failed Dependency) because the request needs to be atomic.
+     *
+     * @param mixed $calendarId
+     * @param array $mutations
+     * @return bool|array
+     */
+    public function updateCalendar($calendarId, array $mutations); 
+
+    /**
+     * Delete a calendar and all it's objects
+     *
+     * @param mixed $calendarId
+     * @return void
+     */
+    public function deleteCalendar($calendarId);
+
+    /**
+     * Returns all calendar objects within a calendar.
+     *
+     * Every item contains an array with the following keys:
+     *   * id - unique identifier which will be used for subsequent updates
+     *   * calendardata - The iCalendar-compatible calendar data
+     *   * uri - a unique key which will be used to construct the uri. This can be any arbitrary string.
+     *   * lastmodified - a timestamp of the last modification time
+     *   * etag - An arbitrary string, surrounded by double-quotes. (e.g.:
+     *   '  "abcdef"')
+     *   * calendarid - The calendarid as it was passed to this function.
+     *   * size - The size of the calendar objects, in bytes.
+     *
+     * Note that the etag is optional, but it's highly encouraged to return for
+     * speed reasons.
+     *
+     * The calendardata is also optional. If it's not returned
+     * 'getCalendarObject' will be called later, which *is* expected to return
+     * calendardata.
+     *
+     * If neither etag or size are specified, the calendardata will be
+     * used/fetched to determine these numbers. If both are specified the
+     * amount of times this is needed is reduced by a great degree.
+     *
+     * @param mixed $calendarId
+     * @return array
+     */
+    public function getCalendarObjects($calendarId);
+
+    /**
+     * Returns information from a single calendar object, based on it's object
+     * uri.
+     *
+     * The returned array must have the same keys as getCalendarObjects. The
+     * 'calendardata' object is required here though, while it's not required
+     * for getCalendarObjects.
+     *
+     * @param mixed $calendarId
+     * @param string $objectUri
+     * @return array
+     */
+    public function getCalendarObject($calendarId,$objectUri);
+
+    /**
+     * Creates a new calendar object.
+     *
+     * It is possible return an etag from this function, which will be used in
+     * the response to this PUT request. Note that the ETag must be surrounded
+     * by double-quotes.
+     *
+     * However, you should only really return this ETag if you don't mangle the
+     * calendar-data. If the result of a subsequent GET to this object is not
+     * the exact same as this request body, you should omit the ETag.
+     *
+     * @param mixed $calendarId
+     * @param string $objectUri
+     * @param string $calendarData
+     * @return string|null
+     */
+    public function createCalendarObject($calendarId,$objectUri,$calendarData);
+
+    /**
+     * Updates an existing calendarobject, based on it's uri.
+     *
+     * It is possible return an etag from this function, which will be used in
+     * the response to this PUT request. Note that the ETag must be surrounded
+     * by double-quotes.
+     *
+     * However, you should only really return this ETag if you don't mangle the
+     * calendar-data. If the result of a subsequent GET to this object is not
+     * the exact same as this request body, you should omit the ETag.
+     *
+     * @param mixed $calendarId
+     * @param string $objectUri
+     * @param string $calendarData
+     * @return string|null
+     */
+    public function updateCalendarObject($calendarId,$objectUri,$calendarData);
+
+    /**
+     * Deletes an existing calendar object.
+     *
+     * @param mixed $calendarId
+     * @param string $objectUri
+     * @return void
+     */
+    public function deleteCalendarObject($calendarId,$objectUri);
+
+    /**
+     * Performs a calendar-query on the contents of this calendar.
+     *
+     * The calendar-query is defined in RFC4791 : CalDAV. Using the
+     * calendar-query it is possible for a client to request a specific set of
+     * object, based on contents of iCalendar properties, date-ranges and
+     * iCalendar component types (VTODO, VEVENT).
+     *
+     * This method should just return a list of (relative) urls that match this
+     * query.
+     *
+     * The list of filters are specified as an array. The exact array is
+     * documented by Sabre_CalDAV_CalendarQueryParser.
+     *
+     * Note that it is extremely likely that getCalendarObject for every path
+     * returned from this method will be called almost immediately after. You
+     * may want to anticipate this to speed up these requests.
+     *
+     * This method provides a default implementation, which parses *all* the
+     * iCalendar objects in the specified calendar.
+     *
+     * This default may well be good enough for personal use, and calendars
+     * that aren't very large. But if you anticipate high usage, big calendars
+     * or high loads, you are strongly adviced to optimize certain paths.
+     *
+     * The best way to do so is override this method and to optimize
+     * specifically for 'common filters'.
+     *
+     * Requests that are extremely common are:
+     *   * requests for just VEVENTS
+     *   * requests for just VTODO
+     *   * requests with a time-range-filter on either VEVENT or VTODO.
+     *
+     * ..and combinations of these requests. It may not be worth it to try to
+     * handle every possible situation and just rely on the (relatively
+     * easy to use) CalendarQueryValidator to handle the rest.
+     *
+     * Note that especially time-range-filters may be difficult to parse. A
+     * time-range filter specified on a VEVENT must for instance also handle
+     * recurrence rules correctly.
+     * A good example of how to interprete all these filters can also simply
+     * be found in Sabre_CalDAV_CalendarQueryFilter. This class is as correct
+     * as possible, so it gives you a good idea on what type of stuff you need
+     * to think of.
+     *
+     * @param mixed $calendarId
+     * @param array $filters
+     * @return array
+     */
+    public function calendarQuery($calendarId, array $filters); 
+
+}
diff --git a/3rdparty/Sabre/CalDAV/Backend/NotificationSupport.php b/3rdparty/Sabre/CalDAV/Backend/NotificationSupport.php
new file mode 100755
index 00000000000..d5a1409d9b9
--- /dev/null
+++ b/3rdparty/Sabre/CalDAV/Backend/NotificationSupport.php
@@ -0,0 +1,47 @@
+<?php
+
+/**
+ * Adds caldav notification support to a backend.
+ *
+ * Note: This feature is experimental, and may change in between different
+ * SabreDAV versions.
+ *
+ * Notifications are defined at:
+ * http://svn.calendarserver.org/repository/calendarserver/CalendarServer/trunk/doc/Extensions/caldav-notifications.txt
+ *
+ * These notifications are basically a list of server-generated notifications 
+ * displayed to the user. Users can dismiss notifications by deleting them.
+ *
+ * The primary usecase is to allow for calendar-sharing.
+ *
+ * @package Sabre
+ * @subpackage CalDAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/) 
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+interface Sabre_CalDAV_Backend_NotificationSupport extends Sabre_CalDAV_Backend_BackendInterface {
+
+    /**
+     * Returns a list of notifications for a given principal url.
+     *
+     * The returned array should only consist of implementations of
+     * Sabre_CalDAV_Notifications_INotificationType. 
+     * 
+     * @param string $principalUri
+     * @return array 
+     */
+    public function getNotificationsForPrincipal($principalUri);
+
+    /**
+     * This deletes a specific notifcation.
+     *
+     * This may be called by a client once it deems a notification handled. 
+     * 
+     * @param string $principalUri 
+     * @param Sabre_CalDAV_Notifications_INotificationType $notification 
+     * @return void
+     */
+    public function deleteNotification($principalUri, Sabre_CalDAV_Notifications_INotificationType $notification); 
+
+}
diff --git a/3rdparty/Sabre/CalDAV/Backend/PDO.php b/3rdparty/Sabre/CalDAV/Backend/PDO.php
index ddacf940c74..447f5f590cf 100755
--- a/3rdparty/Sabre/CalDAV/Backend/PDO.php
+++ b/3rdparty/Sabre/CalDAV/Backend/PDO.php
@@ -1,5 +1,7 @@
 <?php
 
+use Sabre\VObject;
+
 /**
  * PDO CalDAV backend
  *
@@ -9,12 +11,22 @@
  * @package Sabre
  * @subpackage CalDAV
  * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/) 
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
  */
 class Sabre_CalDAV_Backend_PDO extends Sabre_CalDAV_Backend_Abstract {
 
     /**
+     * We need to specify a max date, because we need to stop *somewhere*
+     *
+     * On 32 bit system the maximum for a signed integer is 2147483647, so
+     * MAX_DATE cannot be higher than date('Y-m-d', 2147483647) which results
+     * in 2038-01-19 to avoid problems when the date is converted
+     * to a unix timestamp.
+     */
+    const MAX_DATE = '2038-01-01';
+
+    /**
      * pdo
      *
      * @var PDO
@@ -37,8 +49,9 @@ class Sabre_CalDAV_Backend_PDO extends Sabre_CalDAV_Backend_Abstract {
 
     /**
      * List of CalDAV properties, and how they map to database fieldnames
+     * Add your own properties by simply adding on to this array.
      *
-     * Add your own properties by simply adding on to this array
+     * Note that only string-based properties are supported here.
      *
      * @var array
      */
@@ -90,6 +103,7 @@ class Sabre_CalDAV_Backend_PDO extends Sabre_CalDAV_Backend_Abstract {
         $fields[] = 'ctag';
         $fields[] = 'components';
         $fields[] = 'principaluri';
+        $fields[] = 'transparent';
 
         // Making fields a comma-delimited list
         $fields = implode(', ', $fields);
@@ -110,6 +124,7 @@ class Sabre_CalDAV_Backend_PDO extends Sabre_CalDAV_Backend_Abstract {
                 'principaluri' => $row['principaluri'],
                 '{' . Sabre_CalDAV_Plugin::NS_CALENDARSERVER . '}getctag' => $row['ctag']?$row['ctag']:'0',
                 '{' . Sabre_CalDAV_Plugin::NS_CALDAV . '}supported-calendar-component-set' => new Sabre_CalDAV_Property_SupportedCalendarComponentSet($components),
+                '{' . Sabre_CalDAV_Plugin::NS_CALDAV . '}schedule-calendar-transp' => new Sabre_CalDAV_Property_ScheduleCalendarTransp($row['transparent']?'transparent':'opaque'),
             );
 
 
@@ -142,11 +157,13 @@ class Sabre_CalDAV_Backend_PDO extends Sabre_CalDAV_Backend_Abstract {
             'principaluri',
             'uri',
             'ctag',
+            'transparent',
         );
         $values = array(
             ':principaluri' => $principalUri,
             ':uri'          => $calendarUri,
             ':ctag'         => 1,
+            ':transparent'  => 0,
         );
 
         // Default value
@@ -160,6 +177,10 @@ class Sabre_CalDAV_Backend_PDO extends Sabre_CalDAV_Backend_Abstract {
             }
             $values[':components'] = implode(',',$properties[$sccs]->getValue());
         }
+        $transp = '{' . Sabre_CalDAV_Plugin::NS_CALDAV . '}schedule-calendar-transp';
+        if (isset($properties[$transp])) {
+            $values[':transparent'] = $properties[$transp]->getValue()==='transparent';
+        }
 
         foreach($this->propertyMap as $xmlName=>$dbName) {
             if (isset($properties[$xmlName])) {
@@ -225,17 +246,25 @@ class Sabre_CalDAV_Backend_PDO extends Sabre_CalDAV_Backend_Abstract {
 
         foreach($mutations as $propertyName=>$propertyValue) {
 
-            // We don't know about this property.
-            if (!isset($this->propertyMap[$propertyName])) {
-                $hasError = true;
-                $result[403][$propertyName] = null;
-                unset($mutations[$propertyName]);
-                continue;
+            switch($propertyName) {
+                case '{' . Sabre_CalDAV_Plugin::NS_CALDAV . '}schedule-calendar-transp' :
+                    $fieldName = 'transparent';
+                    $newValues[$fieldName] = $propertyValue->getValue()==='transparent';
+                    break;
+                default :
+                    // Checking the property map
+                    if (!isset($this->propertyMap[$propertyName])) {
+                        // We don't know about this property.
+                        $hasError = true;
+                        $result[403][$propertyName] = null;
+                        unset($mutations[$propertyName]);
+                        continue;
+                    }
+
+                    $fieldName = $this->propertyMap[$propertyName];
+                    $newValues[$fieldName] = $propertyValue;
             }
 
-            $fieldName = $this->propertyMap[$propertyName];
-            $newValues[$fieldName] = $propertyValue;
-
         }
 
         // If there were any errors we need to fail the request
@@ -316,9 +345,22 @@ class Sabre_CalDAV_Backend_PDO extends Sabre_CalDAV_Backend_Abstract {
      */
     public function getCalendarObjects($calendarId) {
 
-        $stmt = $this->pdo->prepare('SELECT * FROM '.$this->calendarObjectTableName.' WHERE calendarid = ?');
+        $stmt = $this->pdo->prepare('SELECT id, uri, lastmodified, etag, calendarid, size FROM '.$this->calendarObjectTableName.' WHERE calendarid = ?');
         $stmt->execute(array($calendarId));
-        return $stmt->fetchAll();
+
+        $result = array();
+        foreach($stmt->fetchAll(\PDO::FETCH_ASSOC) as $row) {
+            $result[] = array(
+                'id'           => $row['id'],
+                'uri'          => $row['uri'],
+                'lastmodified' => $row['lastmodified'],
+                'etag'         => '"' . $row['etag'] . '"',
+                'calendarid'   => $row['calendarid'],
+                'size'         => (int)$row['size'],
+            );
+        }
+
+        return $result;
 
     }
 
@@ -336,44 +378,166 @@ class Sabre_CalDAV_Backend_PDO extends Sabre_CalDAV_Backend_Abstract {
      */
     public function getCalendarObject($calendarId,$objectUri) {
 
-        $stmt = $this->pdo->prepare('SELECT * FROM '.$this->calendarObjectTableName.' WHERE calendarid = ? AND uri = ?');
+        $stmt = $this->pdo->prepare('SELECT id, uri, lastmodified, etag, calendarid, size, calendardata FROM '.$this->calendarObjectTableName.' WHERE calendarid = ? AND uri = ?');
         $stmt->execute(array($calendarId, $objectUri));
-        return $stmt->fetch();
+        $row = $stmt->fetch(\PDO::FETCH_ASSOC);
+
+        if(!$row) return null;
+
+        return array(
+            'id'           => $row['id'],
+            'uri'          => $row['uri'],
+            'lastmodified' => $row['lastmodified'],
+            'etag'         => '"' . $row['etag'] . '"',
+            'calendarid'   => $row['calendarid'],
+            'size'         => (int)$row['size'],
+            'calendardata' => $row['calendardata'],
+         );
 
     }
 
+
     /**
      * Creates a new calendar object.
      *
-     * @param string $calendarId
+     * It is possible return an etag from this function, which will be used in
+     * the response to this PUT request. Note that the ETag must be surrounded
+     * by double-quotes.
+     *
+     * However, you should only really return this ETag if you don't mangle the
+     * calendar-data. If the result of a subsequent GET to this object is not
+     * the exact same as this request body, you should omit the ETag.
+     *
+     * @param mixed $calendarId
      * @param string $objectUri
      * @param string $calendarData
-     * @return void
+     * @return string|null
      */
     public function createCalendarObject($calendarId,$objectUri,$calendarData) {
 
-        $stmt = $this->pdo->prepare('INSERT INTO '.$this->calendarObjectTableName.' (calendarid, uri, calendardata, lastmodified) VALUES (?,?,?,?)');
-        $stmt->execute(array($calendarId,$objectUri,$calendarData,time()));
+        $extraData = $this->getDenormalizedData($calendarData);
+
+        $stmt = $this->pdo->prepare('INSERT INTO '.$this->calendarObjectTableName.' (calendarid, uri, calendardata, lastmodified, etag, size, componenttype, firstoccurence, lastoccurence) VALUES (?,?,?,?,?,?,?,?,?)');
+        $stmt->execute(array(
+            $calendarId,
+            $objectUri,
+            $calendarData,
+            time(),
+            $extraData['etag'],
+            $extraData['size'],
+            $extraData['componentType'],
+            $extraData['firstOccurence'],
+            $extraData['lastOccurence'],
+        ));
         $stmt = $this->pdo->prepare('UPDATE '.$this->calendarTableName.' SET ctag = ctag + 1 WHERE id = ?');
         $stmt->execute(array($calendarId));
 
+        return '"' . $extraData['etag'] . '"';
+
     }
 
     /**
      * Updates an existing calendarobject, based on it's uri.
      *
-     * @param string $calendarId
+     * It is possible return an etag from this function, which will be used in
+     * the response to this PUT request. Note that the ETag must be surrounded
+     * by double-quotes.
+     *
+     * However, you should only really return this ETag if you don't mangle the
+     * calendar-data. If the result of a subsequent GET to this object is not
+     * the exact same as this request body, you should omit the ETag.
+     *
+     * @param mixed $calendarId
      * @param string $objectUri
      * @param string $calendarData
-     * @return void
+     * @return string|null
      */
     public function updateCalendarObject($calendarId,$objectUri,$calendarData) {
 
-        $stmt = $this->pdo->prepare('UPDATE '.$this->calendarObjectTableName.' SET calendardata = ?, lastmodified = ? WHERE calendarid = ? AND uri = ?');
-        $stmt->execute(array($calendarData,time(),$calendarId,$objectUri));
+        $extraData = $this->getDenormalizedData($calendarData);
+
+        $stmt = $this->pdo->prepare('UPDATE '.$this->calendarObjectTableName.' SET calendardata = ?, lastmodified = ?, etag = ?, size = ?, componenttype = ?, firstoccurence = ?, lastoccurence = ? WHERE calendarid = ? AND uri = ?');
+        $stmt->execute(array($calendarData,time(), $extraData['etag'], $extraData['size'], $extraData['componentType'], $extraData['firstOccurence'], $extraData['lastOccurence'] ,$calendarId,$objectUri));
         $stmt = $this->pdo->prepare('UPDATE '.$this->calendarTableName.' SET ctag = ctag + 1 WHERE id = ?');
         $stmt->execute(array($calendarId));
 
+        return '"' . $extraData['etag'] . '"';
+
+    }
+
+    /**
+     * Parses some information from calendar objects, used for optimized
+     * calendar-queries.
+     *
+     * Returns an array with the following keys:
+     *   * etag
+     *   * size
+     *   * componentType
+     *   * firstOccurence
+     *   * lastOccurence
+     *
+     * @param string $calendarData
+     * @return array
+     */
+    protected function getDenormalizedData($calendarData) {
+
+        $vObject = VObject\Reader::read($calendarData);
+        $componentType = null;
+        $component = null;
+        $firstOccurence = null;
+        $lastOccurence = null;
+        foreach($vObject->getComponents() as $component) {
+            if ($component->name!=='VTIMEZONE') {
+                $componentType = $component->name;
+                break;
+            }
+        }
+        if (!$componentType) {
+            throw new Sabre_DAV_Exception_BadRequest('Calendar objects must have a VJOURNAL, VEVENT or VTODO component');
+        }
+        if ($componentType === 'VEVENT') {
+            $firstOccurence = $component->DTSTART->getDateTime()->getTimeStamp();
+            // Finding the last occurence is a bit harder
+            if (!isset($component->RRULE)) {
+                if (isset($component->DTEND)) {
+                    $lastOccurence = $component->DTEND->getDateTime()->getTimeStamp();
+                } elseif (isset($component->DURATION)) {
+                    $endDate = clone $component->DTSTART->getDateTime();
+                    $endDate->add(VObject\DateTimeParser::parse($component->DURATION->value));
+                    $lastOccurence = $endDate->getTimeStamp();
+                } elseif ($component->DTSTART->getDateType()===VObject\Property\DateTime::DATE) {
+                    $endDate = clone $component->DTSTART->getDateTime();
+                    $endDate->modify('+1 day');
+                    $lastOccurence = $endDate->getTimeStamp();
+                } else {
+                    $lastOccurence = $firstOccurence;
+                }
+            } else {
+                $it = new VObject\RecurrenceIterator($vObject, (string)$component->UID);
+                $maxDate = new DateTime(self::MAX_DATE);
+                if ($it->isInfinite()) {
+                    $lastOccurence = $maxDate->getTimeStamp();
+                } else {
+                    $end = $it->getDtEnd();
+                    while($it->valid() && $end < $maxDate) {
+                        $end = $it->getDtEnd();
+                        $it->next();
+
+                    }
+                    $lastOccurence = $end->getTimeStamp();
+                }
+
+            }
+        }
+
+        return array(
+            'etag' => md5($calendarData),
+            'size' => strlen($calendarData),
+            'componentType' => $componentType,
+            'firstOccurence' => $firstOccurence,
+            'lastOccurence'  => $lastOccurence,
+        );
+
     }
 
     /**
@@ -392,5 +556,132 @@ class Sabre_CalDAV_Backend_PDO extends Sabre_CalDAV_Backend_Abstract {
 
     }
 
+    /**
+     * Performs a calendar-query on the contents of this calendar.
+     *
+     * The calendar-query is defined in RFC4791 : CalDAV. Using the
+     * calendar-query it is possible for a client to request a specific set of
+     * object, based on contents of iCalendar properties, date-ranges and
+     * iCalendar component types (VTODO, VEVENT).
+     *
+     * This method should just return a list of (relative) urls that match this
+     * query.
+     *
+     * The list of filters are specified as an array. The exact array is
+     * documented by Sabre_CalDAV_CalendarQueryParser.
+     *
+     * Note that it is extremely likely that getCalendarObject for every path
+     * returned from this method will be called almost immediately after. You
+     * may want to anticipate this to speed up these requests.
+     *
+     * This method provides a default implementation, which parses *all* the
+     * iCalendar objects in the specified calendar.
+     *
+     * This default may well be good enough for personal use, and calendars
+     * that aren't very large. But if you anticipate high usage, big calendars
+     * or high loads, you are strongly adviced to optimize certain paths.
+     *
+     * The best way to do so is override this method and to optimize
+     * specifically for 'common filters'.
+     *
+     * Requests that are extremely common are:
+     *   * requests for just VEVENTS
+     *   * requests for just VTODO
+     *   * requests with a time-range-filter on a VEVENT.
+     *
+     * ..and combinations of these requests. It may not be worth it to try to
+     * handle every possible situation and just rely on the (relatively
+     * easy to use) CalendarQueryValidator to handle the rest.
+     *
+     * Note that especially time-range-filters may be difficult to parse. A
+     * time-range filter specified on a VEVENT must for instance also handle
+     * recurrence rules correctly.
+     * A good example of how to interprete all these filters can also simply
+     * be found in Sabre_CalDAV_CalendarQueryFilter. This class is as correct
+     * as possible, so it gives you a good idea on what type of stuff you need
+     * to think of.
+     *
+     * This specific implementation (for the PDO) backend optimizes filters on
+     * specific components, and VEVENT time-ranges.
+     *
+     * @param string $calendarId
+     * @param array $filters
+     * @return array
+     */
+    public function calendarQuery($calendarId, array $filters) {
+
+        $result = array();
+        $validator = new Sabre_CalDAV_CalendarQueryValidator();
+
+        $componentType = null;
+        $requirePostFilter = true;
+        $timeRange = null;
+
+        // if no filters were specified, we don't need to filter after a query
+        if (!$filters['prop-filters'] && !$filters['comp-filters']) {
+            $requirePostFilter = false;
+        }
+
+        // Figuring out if there's a component filter
+        if (count($filters['comp-filters']) > 0 && !$filters['comp-filters'][0]['is-not-defined']) {
+            $componentType = $filters['comp-filters'][0]['name'];
+
+            // Checking if we need post-filters
+            if (!$filters['prop-filters'] && !$filters['comp-filters'][0]['comp-filters'] && !$filters['comp-filters'][0]['time-range'] && !$filters['comp-filters'][0]['prop-filters']) {
+                $requirePostFilter = false;
+            }
+            // There was a time-range filter
+            if ($componentType == 'VEVENT' && isset($filters['comp-filters'][0]['time-range'])) {
+                $timeRange = $filters['comp-filters'][0]['time-range'];
+
+                // If start time OR the end time is not specified, we can do a
+                // 100% accurate mysql query.
+                if (!$filters['prop-filters'] && !$filters['comp-filters'][0]['comp-filters'] && !$filters['comp-filters'][0]['prop-filters'] && (!$timeRange['start'] || !$timeRange['end'])) {
+                    $requirePostFilter = false;
+                }
+            }
 
+        }
+
+        if ($requirePostFilter) {
+            $query = "SELECT uri, calendardata FROM ".$this->calendarObjectTableName." WHERE calendarid = :calendarid";
+        } else {
+            $query = "SELECT uri FROM ".$this->calendarObjectTableName." WHERE calendarid = :calendarid";
+        }
+
+        $values = array(
+            'calendarid' => $calendarId,
+        );
+
+        if ($componentType) {
+            $query.=" AND componenttype = :componenttype";
+            $values['componenttype'] = $componentType;
+        }
+
+        if ($timeRange && $timeRange['start']) {
+            $query.=" AND lastoccurence > :startdate";
+            $values['startdate'] = $timeRange['start']->getTimeStamp();
+        }
+        if ($timeRange && $timeRange['end']) {
+            $query.=" AND firstoccurence < :enddate";
+            $values['enddate'] = $timeRange['end']->getTimeStamp();
+        }
+
+        $stmt = $this->pdo->prepare($query);
+        $stmt->execute($values);
+
+        $result = array();
+        while($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+            if ($requirePostFilter) {
+                if (!$this->validateFilterForObject($row, $filters)) {
+                    continue;
+                }
+            }
+            $result[] = $row['uri'];
+
+        }
+
+        return $result;
+
+    }
 }
diff --git a/3rdparty/Sabre/CalDAV/Backend/SharingSupport.php b/3rdparty/Sabre/CalDAV/Backend/SharingSupport.php
new file mode 100755
index 00000000000..f73f0ff3d8a
--- /dev/null
+++ b/3rdparty/Sabre/CalDAV/Backend/SharingSupport.php
@@ -0,0 +1,238 @@
+<?php
+
+/**
+ * Adds support for sharing features to a CalDAV server.
+ *
+ * Note: This feature is experimental, and may change in between different
+ * SabreDAV versions.
+ *
+ * Early warning: Currently SabreDAV provides no implementation for this. This
+ * is, because in it's current state there is no elegant way to do this.
+ * The problem lies in the fact that a real CalDAV server with sharing support
+ * would first need email support (with invite notifications), and really also
+ * a browser-frontend that allows people to accept or reject these shares.
+ *
+ * In addition, the CalDAV backends are currently kept as independent as
+ * possible, and should not be aware of principals, email addresses or
+ * accounts.
+ *
+ * Adding an implementation for Sharing to standard-sabredav would contradict
+ * these goals, so for this reason this is currently not implemented, although
+ * it may very well in the future; but probably not before SabreDAV 2.0.
+ *
+ * The interface works however, so if you implement all this, and do it
+ * correctly sharing _will_ work. It's not particularly easy, and I _urge you_
+ * to make yourself acquainted with the following document first:
+ *
+ * https://trac.calendarserver.org/browser/CalendarServer/trunk/doc/Extensions/caldav-sharing.txt
+ *
+ * An overview
+ * ===========
+ *
+ * Implementing this interface will allow a user to share his or her calendars
+ * to other users. Effectively, when a calendar is shared the calendar will
+ * show up in both the Sharer's and Sharee's calendar-home root.
+ * This interface adds a few methods that ensure that this happens, and there
+ * are also a number of new requirements in the base-class you must now follow.
+ *
+ *
+ * How it works
+ * ============
+ *
+ * When a user shares a calendar, the addShare() method will be called with a
+ * list of sharees that are now added, and a list of sharees that have been
+ * removed.
+ * Removal is instant, but when a sharee is added the sharee first gets a
+ * chance to accept or reject the invitation for a share.
+ *
+ * After a share is accepted, the calendar will be returned from
+ * getUserCalendars for both the sharer, and the sharee.
+ *
+ * If the sharee deletes the calendar, only their share gets deleted. When the
+ * owner deletes a calendar, it will be removed for everybody.
+ *
+ *
+ * Notifications
+ * =============
+ *
+ * During all these sharing operations, a lot of notifications are sent back
+ * and forward.
+ *
+ * Whenever the list of sharees for a calendar has been changed (they have been
+ * added, removed or modified) all sharees should get a notification for this
+ * change.
+ * This notification is always represented by:
+ *
+ * Sabre_CalDAV_Notifications_Notification_Invite
+ *
+ * In the case of an invite, the sharee may reply with an 'accept' or
+ * 'decline'. These are always represented by:
+ *
+ * Sabre_CalDAV_Notifications_Notification_Invite
+ *
+ *
+ * Calendar access by sharees
+ * ==========================
+ *
+ * As mentioned earlier, shared calendars must now also be returned for
+ * getCalendarsForUser for sharees. A few things change though.
+ *
+ * The following properties must be specified:
+ *
+ * 1. {http://calendarserver.org/ns/}shared-url
+ *
+ * This property MUST contain the url to the original calendar, that is.. the
+ * path to the calendar from the owner.
+ *
+ * 2. {http://sabredav.org/ns}owner-principal
+ *
+ * This is a url to to the principal who is sharing the calendar.
+ *
+ * 3. {http://sabredav.org/ns}read-only
+ *
+ * This should be either 0 or 1, depending on if the user has read-only or
+ * read-write access to the calendar.
+ *
+ * Only when this is done, the calendar will correctly be marked as a calendar
+ * that's shared to him, thus allowing clients to display the correct interface
+ * and ACL enforcement.
+ *
+ * If a sharee deletes their calendar, only their instance of the calendar
+ * should be deleted, the original should still exists.
+ * Pretty much any 'dead' WebDAV properties on these shared calendars should be
+ * specific to a user. This means that if the displayname is changed by a
+ * sharee, the original is not affected. This is also true for:
+ *   * The description
+ *   * The color
+ *   * The order
+ *   * And any other dead properties.
+ *
+ * Properties like a ctag should not be different for multiple instances of the
+ * calendar.
+ *
+ * Lastly, objects *within* calendars should also have user-specific data. The
+ * two things that are user-specific are:
+ *   * VALARM objects
+ *   * The TRANSP property
+ *
+ * This _also_ implies that if a VALARM is deleted by a sharee for some event,
+ * this has no effect on the original VALARM.
+ *
+ * Understandably, the this last requirement is one of the hardest.
+ * Realisticly, I can see people ignoring this part of the spec, but that could
+ * cause a different set of issues.
+ *
+ *
+ * Publishing
+ * ==========
+ *
+ * When a user publishes a url, the server should generate a 'publish url'.
+ * This is a read-only url, anybody can use to consume the calendar feed.
+ *
+ * Calendars are in one of two states:
+ *   * published
+ *   * unpublished
+ *
+ * If a calendar is published, the following property should be returned
+ * for each calendar in getCalendarsForPrincipal.
+ *
+ * {http://calendarserver.org/ns/}publish-url
+ *
+ * This element should contain a {DAV:}href element, which points to the
+ * public url that does not require authentication. Unlike every other href,
+ * this url must be absolute.
+ *
+ * Ideally, the following property is always returned
+ *
+ * {http://calendarserver.org/ns/}pre-publish-url
+ *
+ * This property should contain the url that the calendar _would_ have, if it
+ * were to be published. iCal uses this to display the url, before the user
+ * will actually publish it.
+ *
+ *
+ * Selectively disabling publish or share feature
+ * ==============================================
+ *
+ * If Sabre_CalDAV_Property_AllowedSharingModes is returned from
+ * getCalendarsByUser, this allows the server to specify wether either sharing,
+ * or publishing is supported.
+ *
+ * This allows a client to determine in advance which features are available,
+ * and update the interface appropriately. If this property is not returned by
+ * the backend, the SharingPlugin automatically injects it and assumes both
+ * features are available.
+ *
+ * @package Sabre
+ * @subpackage CalDAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+interface Sabre_CalDAV_Backend_SharingSupport extends Sabre_CalDAV_Backend_NotificationSupport {
+
+    /**
+     * Updates the list of shares.
+     *
+     * The first array is a list of people that are to be added to the
+     * calendar.
+     *
+     * Every element in the add array has the following properties:
+     *   * href - A url. Usually a mailto: address
+     *   * commonName - Usually a first and last name, or false
+     *   * summary - A description of the share, can also be false
+     *   * readOnly - A boolean value
+     *
+     * Every element in the remove array is just the address string.
+     *
+     * Note that if the calendar is currently marked as 'not shared' by and
+     * this method is called, the calendar should be 'upgraded' to a shared
+     * calendar.
+     *
+     * @param mixed $calendarId
+     * @param array $add
+     * @param array $remove
+     * @return void
+     */
+    function updateShares($calendarId, array $add, array $remove);
+
+    /**
+     * Returns the list of people whom this calendar is shared with.
+     *
+     * Every element in this array should have the following properties:
+     *   * href - Often a mailto: address
+     *   * commonName - Optional, for example a first + last name
+     *   * status - See the Sabre_CalDAV_SharingPlugin::STATUS_ constants.
+     *   * readOnly - boolean
+     *   * summary - Optional, a description for the share
+     *
+     * @param mixed $calendarId
+     * @return array
+     */
+    function getShares($calendarId);
+
+    /**
+     * This method is called when a user replied to a request to share.
+     *
+     * If the user chose to accept the share, this method should return the
+     * newly created calendar url.
+     *
+     * @param string href The sharee who is replying (often a mailto: address)
+     * @param int status One of the SharingPlugin::STATUS_* constants
+     * @param string $calendarUri The url to the calendar thats being shared
+     * @param string $inReplyTo The unique id this message is a response to
+     * @param string $summary A description of the reply
+     * @return null|string
+     */
+    function shareReply($href, $status, $calendarUri, $inReplyTo, $summary = null);
+
+    /**
+     * Publishes a calendar
+     *
+     * @param mixed $calendarId
+     * @param bool $value
+     * @return void
+     */
+    function setPublishStatus($calendarId, $value);
+
+}
diff --git a/3rdparty/Sabre/CalDAV/Calendar.php b/3rdparty/Sabre/CalDAV/Calendar.php
index 623df2dd1b8..63253febd5c 100755
--- a/3rdparty/Sabre/CalDAV/Calendar.php
+++ b/3rdparty/Sabre/CalDAV/Calendar.php
@@ -9,7 +9,7 @@
  * @package Sabre
  * @subpackage CalDAV
  * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/) 
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
  */
 class Sabre_CalDAV_Calendar implements Sabre_CalDAV_ICalendar, Sabre_DAV_IProperties, Sabre_DAVACL_IACL {
@@ -24,7 +24,7 @@ class Sabre_CalDAV_Calendar implements Sabre_CalDAV_ICalendar, Sabre_DAV_IProper
     /**
      * CalDAV backend
      *
-     * @var Sabre_CalDAV_Backend_Abstract
+     * @var Sabre_CalDAV_Backend_BackendInterface
      */
     protected $caldavBackend;
 
@@ -39,16 +39,15 @@ class Sabre_CalDAV_Calendar implements Sabre_CalDAV_ICalendar, Sabre_DAV_IProper
      * Constructor
      *
      * @param Sabre_DAVACL_IPrincipalBackend $principalBackend
-     * @param Sabre_CalDAV_Backend_Abstract $caldavBackend
+     * @param Sabre_CalDAV_Backend_BackendInterface $caldavBackend
      * @param array $calendarInfo
      */
-    public function __construct(Sabre_DAVACL_IPrincipalBackend $principalBackend, Sabre_CalDAV_Backend_Abstract $caldavBackend, $calendarInfo) {
+    public function __construct(Sabre_DAVACL_IPrincipalBackend $principalBackend, Sabre_CalDAV_Backend_BackendInterface $caldavBackend, $calendarInfo) {
 
         $this->caldavBackend = $caldavBackend;
         $this->principalBackend = $principalBackend;
         $this->calendarInfo = $calendarInfo;
 
-
     }
 
     /**
@@ -92,9 +91,6 @@ class Sabre_CalDAV_Calendar implements Sabre_CalDAV_ICalendar, Sabre_DAV_IProper
             case '{urn:ietf:params:xml:ns:caldav}supported-collation-set' :
                 $response[$prop] =  new Sabre_CalDAV_Property_SupportedCollationSet();
                 break;
-            case '{DAV:}owner' :
-                $response[$prop] = new Sabre_DAVACL_Property_Principal(Sabre_DAVACL_Property_Principal::HREF,$this->calendarInfo['principaluri']);
-                break;
             default :
                 if (isset($this->calendarInfo[$prop])) $response[$prop] = $this->calendarInfo[$prop];
                 break;
@@ -110,12 +106,21 @@ class Sabre_CalDAV_Calendar implements Sabre_CalDAV_ICalendar, Sabre_DAV_IProper
      * The contained calendar objects are for example Events or Todo's.
      *
      * @param string $name
-     * @return Sabre_DAV_ICalendarObject
+     * @return Sabre_CalDAV_ICalendarObject
      */
     public function getChild($name) {
 
         $obj = $this->caldavBackend->getCalendarObject($this->calendarInfo['id'],$name);
         if (!$obj) throw new Sabre_DAV_Exception_NotFound('Calendar object not found');
+
+        $obj['acl'] = $this->getACL();
+        // Removing the irrelivant
+        foreach($obj['acl'] as $key=>$acl) {
+            if ($acl['privilege'] === '{' . Sabre_CalDAV_Plugin::NS_CALDAV . '}read-free-busy') {
+                unset($obj['acl'][$key]);
+            }
+        }
+
         return new Sabre_CalDAV_CalendarObject($this->caldavBackend,$this->calendarInfo,$obj);
 
     }
@@ -130,6 +135,13 @@ class Sabre_CalDAV_Calendar implements Sabre_CalDAV_ICalendar, Sabre_DAV_IProper
         $objs = $this->caldavBackend->getCalendarObjects($this->calendarInfo['id']);
         $children = array();
         foreach($objs as $obj) {
+            $obj['acl'] = $this->getACL();
+            // Removing the irrelivant
+            foreach($obj['acl'] as $key=>$acl) {
+                if ($acl['privilege'] === '{' . Sabre_CalDAV_Plugin::NS_CALDAV . '}read-free-busy') {
+                    unset($obj['acl'][$key]);
+                }
+            }
             $children[] = new Sabre_CalDAV_CalendarObject($this->caldavBackend,$this->calendarInfo,$obj);
         }
         return $children;
@@ -262,27 +274,27 @@ class Sabre_CalDAV_Calendar implements Sabre_CalDAV_ICalendar, Sabre_DAV_IProper
         return array(
             array(
                 'privilege' => '{DAV:}read',
-                'principal' => $this->calendarInfo['principaluri'],
+                'principal' => $this->getOwner(),
                 'protected' => true,
             ),
             array(
                 'privilege' => '{DAV:}write',
-                'principal' => $this->calendarInfo['principaluri'],
+                'principal' => $this->getOwner(),
                 'protected' => true,
             ),
             array(
                 'privilege' => '{DAV:}read',
-                'principal' => $this->calendarInfo['principaluri'] . '/calendar-proxy-write',
+                'principal' => $this->getOwner() . '/calendar-proxy-write',
                 'protected' => true,
             ),
             array(
                 'privilege' => '{DAV:}write',
-                'principal' => $this->calendarInfo['principaluri'] . '/calendar-proxy-write',
+                'principal' => $this->getOwner() . '/calendar-proxy-write',
                 'protected' => true,
             ),
             array(
                 'privilege' => '{DAV:}read',
-                'principal' => $this->calendarInfo['principaluri'] . '/calendar-proxy-read',
+                'principal' => $this->getOwner() . '/calendar-proxy-read',
                 'protected' => true,
             ),
             array(
@@ -340,4 +352,27 @@ class Sabre_CalDAV_Calendar implements Sabre_CalDAV_ICalendar, Sabre_DAV_IProper
 
     }
 
+    /**
+     * Performs a calendar-query on the contents of this calendar.
+     *
+     * The calendar-query is defined in RFC4791 : CalDAV. Using the
+     * calendar-query it is possible for a client to request a specific set of
+     * object, based on contents of iCalendar properties, date-ranges and
+     * iCalendar component types (VTODO, VEVENT).
+     *
+     * This method should just return a list of (relative) urls that match this
+     * query.
+     *
+     * The list of filters are specified as an array. The exact array is
+     * documented by Sabre_CalDAV_CalendarQueryParser.
+     *
+     * @param array $filters
+     * @return array
+     */
+    public function calendarQuery(array $filters) {
+
+        return $this->caldavBackend->calendarQuery($this->calendarInfo['id'], $filters);
+
+    }
+
 }
diff --git a/3rdparty/Sabre/CalDAV/CalendarObject.php b/3rdparty/Sabre/CalDAV/CalendarObject.php
index 72f0a578d16..40bd8588c70 100755
--- a/3rdparty/Sabre/CalDAV/CalendarObject.php
+++ b/3rdparty/Sabre/CalDAV/CalendarObject.php
@@ -6,13 +6,13 @@
  * @package Sabre
  * @subpackage CalDAV
  * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/) 
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
  */
 class Sabre_CalDAV_CalendarObject extends Sabre_DAV_File implements Sabre_CalDAV_ICalendarObject, Sabre_DAVACL_IACL {
 
     /**
-     * Sabre_CalDAV_Backend_Abstract
+     * Sabre_CalDAV_Backend_BackendInterface
      *
      * @var array
      */
@@ -35,11 +35,11 @@ class Sabre_CalDAV_CalendarObject extends Sabre_DAV_File implements Sabre_CalDAV
     /**
      * Constructor
      *
-     * @param Sabre_CalDAV_Backend_Abstract $caldavBackend
+     * @param Sabre_CalDAV_Backend_BackendInterface $caldavBackend
      * @param array $calendarInfo
      * @param array $objectData
      */
-    public function __construct(Sabre_CalDAV_Backend_Abstract $caldavBackend,array $calendarInfo,array $objectData) {
+    public function __construct(Sabre_CalDAV_Backend_BackendInterface $caldavBackend,array $calendarInfo,array $objectData) {
 
         $this->caldavBackend = $caldavBackend;
 
@@ -85,8 +85,8 @@ class Sabre_CalDAV_CalendarObject extends Sabre_DAV_File implements Sabre_CalDAV
     /**
      * Updates the ICalendar-formatted object
      *
-     * @param string $calendarData
-     * @return void
+     * @param string|resource $calendarData
+     * @return string
      */
     public function put($calendarData) {
 
@@ -119,7 +119,7 @@ class Sabre_CalDAV_CalendarObject extends Sabre_DAV_File implements Sabre_CalDAV
      */
     public function getContentType() {
 
-        return 'text/calendar';
+        return 'text/calendar; charset=utf-8';
 
     }
 
@@ -143,7 +143,7 @@ class Sabre_CalDAV_CalendarObject extends Sabre_DAV_File implements Sabre_CalDAV
     /**
      * Returns the last modification date as a unix timestamp
      *
-     * @return time
+     * @return int
      */
     public function getLastModified() {
 
@@ -206,6 +206,12 @@ class Sabre_CalDAV_CalendarObject extends Sabre_DAV_File implements Sabre_CalDAV
      */
     public function getACL() {
 
+        // An alternative acl may be specified in the object data.
+        if (isset($this->objectData['acl'])) {
+            return $this->objectData['acl'];
+        }
+
+        // The default ACL
         return array(
             array(
                 'privilege' => '{DAV:}read',
diff --git a/3rdparty/Sabre/CalDAV/CalendarQueryParser.php b/3rdparty/Sabre/CalDAV/CalendarQueryParser.php
index bd0d343382f..b95095f96fc 100755
--- a/3rdparty/Sabre/CalDAV/CalendarQueryParser.php
+++ b/3rdparty/Sabre/CalDAV/CalendarQueryParser.php
@@ -1,5 +1,7 @@
 <?php
 
+use Sabre\VObject;
+
 /**
  * Parses the calendar-query report request body.
  *
@@ -68,7 +70,7 @@ class Sabre_CalDAV_CalendarQueryParser {
 
         $this->xpath = new DOMXPath($dom);
         $this->xpath->registerNameSpace('cal',Sabre_CalDAV_Plugin::NS_CALDAV);
-        $this->xpath->registerNameSpace('dav','urn:DAV');
+        $this->xpath->registerNameSpace('dav','DAV:');
 
     }
 
@@ -241,12 +243,12 @@ class Sabre_CalDAV_CalendarQueryParser {
         $timeRangeNode = $timeRangeNodes->item(0);
 
         if ($start = $timeRangeNode->getAttribute('start')) {
-            $start = Sabre_VObject_DateTimeParser::parseDateTime($start);
+            $start = VObject\DateTimeParser::parseDateTime($start);
         } else {
             $start = null;
         }
         if ($end = $timeRangeNode->getAttribute('end')) {
-            $end = Sabre_VObject_DateTimeParser::parseDateTime($end);
+            $end = VObject\DateTimeParser::parseDateTime($end);
         } else {
             $end = null;
         }
@@ -274,13 +276,13 @@ class Sabre_CalDAV_CalendarQueryParser {
         if(!$start) {
             throw new Sabre_DAV_Exception_BadRequest('The "start" attribute is required for the CALDAV:expand element');
         } 
-        $start = Sabre_VObject_DateTimeParser::parseDateTime($start);
+        $start = VObject\DateTimeParser::parseDateTime($start);
 
         $end = $parentNode->getAttribute('end');
         if(!$end) {
             throw new Sabre_DAV_Exception_BadRequest('The "end" attribute is required for the CALDAV:expand element');
         } 
-        $end = Sabre_VObject_DateTimeParser::parseDateTime($end);
+        $end = VObject\DateTimeParser::parseDateTime($end);
         
         if ($end <= $start) {
             throw new Sabre_DAV_Exception_BadRequest('The end-date must be larger than the start-date in the expand element.');
diff --git a/3rdparty/Sabre/CalDAV/CalendarQueryValidator.php b/3rdparty/Sabre/CalDAV/CalendarQueryValidator.php
index 8f674840e87..53e86fc509f 100755
--- a/3rdparty/Sabre/CalDAV/CalendarQueryValidator.php
+++ b/3rdparty/Sabre/CalDAV/CalendarQueryValidator.php
@@ -1,5 +1,7 @@
 <?php
 
+use Sabre\VObject;
+
 /**
  * CalendarQuery Validator
  *
@@ -22,11 +24,11 @@ class Sabre_CalDAV_CalendarQueryValidator {
      *
      * The list of filters must be formatted as parsed by Sabre_CalDAV_CalendarQueryParser
      *
-     * @param Sabre_VObject_Component $vObject
+     * @param VObject\Component $vObject
      * @param array $filters
      * @return bool
      */
-    public function validate(Sabre_VObject_Component $vObject,array $filters) {
+    public function validate(VObject\Component $vObject,array $filters) {
 
         // The top level object is always a component filter.
         // We'll parse it manually, as it's pretty simple.
@@ -48,11 +50,11 @@ class Sabre_CalDAV_CalendarQueryValidator {
      * component we're checking should be specified, not the component to check
      * itself.
      *
-     * @param Sabre_VObject_Component $parent
+     * @param VObject\Component $parent
      * @param array $filters
      * @return bool
      */
-    protected function validateCompFilters(Sabre_VObject_Component $parent, array $filters) {
+    protected function validateCompFilters(VObject\Component $parent, array $filters) {
 
         foreach($filters as $filter) {
 
@@ -117,11 +119,11 @@ class Sabre_CalDAV_CalendarQueryValidator {
      * property we're checking should be specified, not the property to check
      * itself.
      *
-     * @param Sabre_VObject_Component $parent
+     * @param VObject\Component $parent
      * @param array $filters
      * @return bool
      */
-    protected function validatePropFilters(Sabre_VObject_Component $parent, array $filters) {
+    protected function validatePropFilters(VObject\Component $parent, array $filters) {
 
         foreach($filters as $filter) {
 
@@ -187,11 +189,11 @@ class Sabre_CalDAV_CalendarQueryValidator {
      * parameter we're checking should be specified, not the parameter to check
      * itself.
      *
-     * @param Sabre_VObject_Property $parent
+     * @param VObject\Property $parent
      * @param array $filters
      * @return bool
      */
-    protected function validateParamFilters(Sabre_VObject_Property $parent, array $filters) {
+    protected function validateParamFilters(VObject\Property $parent, array $filters) {
 
         foreach($filters as $filter) {
 
@@ -243,11 +245,11 @@ class Sabre_CalDAV_CalendarQueryValidator {
      * A single text-match should be specified as well as the specific property
      * or parameter we need to validate.
      *
-     * @param Sabre_VObject_Node $parent
+     * @param VObject\Node $parent
      * @param array $textMatch
      * @return bool
      */
-    protected function validateTextMatch(Sabre_VObject_Node $parent, array $textMatch) {
+    protected function validateTextMatch(VObject\Node $parent, array $textMatch) {
 
         $value = (string)$parent;
 
@@ -263,12 +265,12 @@ class Sabre_CalDAV_CalendarQueryValidator {
      * This is all based on the rules specified in rfc4791, which are quite
      * complex.
      *
-     * @param Sabre_VObject_Node $component
+     * @param VObject\Node $component
      * @param DateTime $start
      * @param DateTime $end
      * @return bool
      */
-    protected function validateTimeRange(Sabre_VObject_Node $component, $start, $end) {
+    protected function validateTimeRange(VObject\Node $component, $start, $end) {
 
         if (is_null($start)) {
             $start = new DateTime('1900-01-01');
@@ -296,7 +298,7 @@ class Sabre_CalDAV_CalendarQueryValidator {
                 if ($component->parent->name === 'VEVENT' && $component->parent->RRULE) {
 
                     // Fire up the iterator!
-                    $it = new Sabre_VObject_RecurrenceIterator($component->parent->parent, (string)$component->parent->UID);
+                    $it = new VObject\RecurrenceIterator($component->parent->parent, (string)$component->parent->UID);
                     while($it->valid()) {
                         $expandedEvent = $it->getEventObject();
 
diff --git a/3rdparty/Sabre/CalDAV/CalendarRootNode.php b/3rdparty/Sabre/CalDAV/CalendarRootNode.php
index 3907913cc78..eb62eea75a6 100755
--- a/3rdparty/Sabre/CalDAV/CalendarRootNode.php
+++ b/3rdparty/Sabre/CalDAV/CalendarRootNode.php
@@ -1,14 +1,15 @@
 <?php
 
 /**
- * Users collection
+ * Calendars collection
  *
- * This object is responsible for generating a collection of users.
+ * This object is responsible for generating a list of calendar-homes for each
+ * user.
  *
  * @package Sabre
  * @subpackage CalDAV
  * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/) 
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
  */
 class Sabre_CalDAV_CalendarRootNode extends Sabre_DAVACL_AbstractPrincipalCollection {
@@ -16,7 +17,7 @@ class Sabre_CalDAV_CalendarRootNode extends Sabre_DAVACL_AbstractPrincipalCollec
     /**
      * CalDAV backend
      *
-     * @var Sabre_CalDAV_Backend_Abstract
+     * @var Sabre_CalDAV_Backend_BackendInterface
      */
     protected $caldavBackend;
 
@@ -32,10 +33,10 @@ class Sabre_CalDAV_CalendarRootNode extends Sabre_DAVACL_AbstractPrincipalCollec
      *
      *
      * @param Sabre_DAVACL_IPrincipalBackend $principalBackend
-     * @param Sabre_CalDAV_Backend_Abstract $caldavBackend
+     * @param Sabre_CalDAV_Backend_BackendInterface $caldavBackend
      * @param string $principalPrefix
      */
-    public function __construct(Sabre_DAVACL_IPrincipalBackend $principalBackend,Sabre_CalDAV_Backend_Abstract $caldavBackend, $principalPrefix = 'principals') {
+    public function __construct(Sabre_DAVACL_IPrincipalBackend $principalBackend,Sabre_CalDAV_Backend_BackendInterface $caldavBackend, $principalPrefix = 'principals') {
 
         parent::__construct($principalBackend, $principalPrefix);
         $this->caldavBackend = $caldavBackend;
diff --git a/3rdparty/Sabre/CalDAV/Exception/InvalidComponentType.php b/3rdparty/Sabre/CalDAV/Exception/InvalidComponentType.php
new file mode 100755
index 00000000000..4ac617d22f0
--- /dev/null
+++ b/3rdparty/Sabre/CalDAV/Exception/InvalidComponentType.php
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * Sabre_CalDAV_Exception_InvalidComponentType
+ *
+ * @package Sabre
+ * @subpackage CalDAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+class Sabre_CalDAV_Exception_InvalidComponentType extends Sabre_DAV_Exception_Forbidden {
+
+    /**
+     * Adds in extra information in the xml response.
+     *
+     * This method adds the {CALDAV:}supported-calendar-component as defined in rfc4791
+     *
+     * @param Sabre_DAV_Server $server
+     * @param DOMElement $errorNode
+     * @return void
+     */
+    public function serialize(Sabre_DAV_Server $server,DOMElement $errorNode) {
+
+        $doc = $errorNode->ownerDocument;
+
+        $np = $doc->createElementNS(Sabre_CalDAV_Plugin::NS_CALDAV,'cal:supported-calendar-component');
+        $errorNode->appendChild($np);
+
+    }
+
+}
\ No newline at end of file
diff --git a/3rdparty/Sabre/CalDAV/ICSExportPlugin.php b/3rdparty/Sabre/CalDAV/ICSExportPlugin.php
index ec42b406b2f..d3e4e7b7201 100755
--- a/3rdparty/Sabre/CalDAV/ICSExportPlugin.php
+++ b/3rdparty/Sabre/CalDAV/ICSExportPlugin.php
@@ -1,5 +1,7 @@
 <?php
 
+use Sabre\VObject;
+
 /**
  * ICS Exporter
  *
@@ -82,7 +84,7 @@ class Sabre_CalDAV_ICSExportPlugin extends Sabre_DAV_ServerPlugin {
      */
     public function generateICS(array $nodes) {
 
-        $calendar = new Sabre_VObject_Component('vcalendar');
+        $calendar = new VObject\Component('vcalendar');
         $calendar->version = '2.0';
         if (Sabre_DAV_Server::$exposeVersion) {
             $calendar->prodid = '-//SabreDAV//SabreDAV ' . Sabre_DAV_Version::VERSION . '//EN';
@@ -103,7 +105,7 @@ class Sabre_CalDAV_ICSExportPlugin extends Sabre_DAV_ServerPlugin {
             }
             $nodeData = $node[200]['{' . Sabre_CalDAV_Plugin::NS_CALDAV . '}calendar-data'];
 
-            $nodeComp = Sabre_VObject_Reader::read($nodeData);
+            $nodeComp = VObject\Reader::read($nodeData);
 
             foreach($nodeComp->children() as $child) {
 
diff --git a/3rdparty/Sabre/CalDAV/ICalendar.php b/3rdparty/Sabre/CalDAV/ICalendar.php
index 15d51ebcf79..40aa9f9579c 100755
--- a/3rdparty/Sabre/CalDAV/ICalendar.php
+++ b/3rdparty/Sabre/CalDAV/ICalendar.php
@@ -8,11 +8,28 @@
  * @package Sabre
  * @subpackage CalDAV
  * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/) 
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
  */
 interface Sabre_CalDAV_ICalendar extends Sabre_DAV_ICollection {
 
-
+    /**
+     * Performs a calendar-query on the contents of this calendar.
+     *
+     * The calendar-query is defined in RFC4791 : CalDAV. Using the
+     * calendar-query it is possible for a client to request a specific set of
+     * object, based on contents of iCalendar properties, date-ranges and
+     * iCalendar component types (VTODO, VEVENT).
+     *
+     * This method should just return a list of (relative) urls that match this
+     * query.
+     *
+     * The list of filters are specified as an array. The exact array is
+     * documented by Sabre_CalDAV_CalendarQueryParser.
+     *
+     * @param array $filters
+     * @return array
+     */
+    public function calendarQuery(array $filters);
 
 }
diff --git a/3rdparty/Sabre/CalDAV/IShareableCalendar.php b/3rdparty/Sabre/CalDAV/IShareableCalendar.php
new file mode 100755
index 00000000000..5b55788c014
--- /dev/null
+++ b/3rdparty/Sabre/CalDAV/IShareableCalendar.php
@@ -0,0 +1,48 @@
+<?php
+
+/**
+ * This interface represents a Calendar that can be shared with other users.
+ *
+ * @package Sabre
+ * @subpackage CalDAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+interface Sabre_CalDAV_IShareableCalendar extends Sabre_CalDAV_ICalendar {
+
+    /**
+     * Updates the list of shares.
+     *
+     * The first array is a list of people that are to be added to the
+     * calendar.
+     *
+     * Every element in the add array has the following properties:
+     *   * href - A url. Usually a mailto: address
+     *   * commonName - Usually a first and last name, or false
+     *   * summary - A description of the share, can also be false
+     *   * readOnly - A boolean value
+     *
+     * Every element in the remove array is just the address string.
+     *
+     * @param array $add
+     * @param array $remove
+     * @return void
+     */
+    function updateShares(array $add, array $remove);
+
+    /**
+     * Returns the list of people whom this calendar is shared with.
+     *
+     * Every element in this array should have the following properties:
+     *   * href - Often a mailto: address
+     *   * commonName - Optional, for example a first + last name
+     *   * status - See the Sabre_CalDAV_SharingPlugin::STATUS_ constants.
+     *   * readOnly - boolean
+     *   * summary - Optional, a description for the share
+     *
+     * @return array
+     */
+    function getShares();
+
+}
diff --git a/3rdparty/Sabre/CalDAV/ISharedCalendar.php b/3rdparty/Sabre/CalDAV/ISharedCalendar.php
new file mode 100755
index 00000000000..eb4d31fead5
--- /dev/null
+++ b/3rdparty/Sabre/CalDAV/ISharedCalendar.php
@@ -0,0 +1,22 @@
+<?php
+
+/**
+ * This interface represents a Calendar that is shared by a different user.
+ *
+ * @package Sabre
+ * @subpackage CalDAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+interface Sabre_CalDAV_ISharedCalendar extends Sabre_CalDAV_ICalendar {
+
+    /**
+     * This method should return the url of the owners' copy of the shared
+     * calendar.
+     *
+     * @return string
+     */
+    function getSharedUrl();
+
+}
diff --git a/3rdparty/Sabre/CalDAV/Notifications/Collection.php b/3rdparty/Sabre/CalDAV/Notifications/Collection.php
new file mode 100755
index 00000000000..83b6c9301dc
--- /dev/null
+++ b/3rdparty/Sabre/CalDAV/Notifications/Collection.php
@@ -0,0 +1,169 @@
+<?php
+
+/**
+ * This node represents a list of notifications.
+ *
+ * It provides no additional functionality, but you must implement this
+ * interface to allow the Notifications plugin to mark the collection
+ * as a notifications collection.
+ *
+ * This collection should only return Sabre_CalDAV_Notifications_INode nodes as
+ * its children.
+ *
+ * @package Sabre
+ * @subpackage CalDAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+class Sabre_CalDAV_Notifications_Collection extends Sabre_DAV_Collection implements Sabre_CalDAV_Notifications_ICollection, Sabre_DAVACL_IACL {
+
+    /**
+     * The notification backend
+     *
+     * @var Sabre_CalDAV_Backend_NotificationSupport
+     */
+    protected $caldavBackend;
+
+    /**
+     * Principal uri
+     *
+     * @var string
+     */
+    protected $principalUri;
+
+    /**
+     * Constructor
+     *
+     * @param Sabre_CalDAV_Backend_NotificationSupport $caldavBackend
+     * @param string $principalUri
+     */
+    public function __construct(Sabre_CalDAV_Backend_NotificationSupport $caldavBackend, $principalUri) {
+
+        $this->caldavBackend = $caldavBackend;
+        $this->principalUri = $principalUri;
+
+    }
+
+    /**
+     * Returns all notifications for a principal
+     *
+     * @return array
+     */
+    public function getChildren() {
+
+        $children = array();
+        $notifications = $this->caldavBackend->getNotificationsForPrincipal($this->principalUri);
+
+        foreach($notifications as $notification) {
+
+            $children[] = new Sabre_CalDAV_Notifications_Node(
+                $this->caldavBackend,
+                $this->principalUri,
+                $notification
+            );
+        }
+
+        return $children;
+
+    }
+
+    /**
+     * Returns the name of this object
+     *
+     * @return string
+     */
+    public function getName() {
+
+        return 'notifications';
+
+    }
+
+    /**
+     * Returns the owner principal
+     *
+     * This must be a url to a principal, or null if there's no owner
+     *
+     * @return string|null
+     */
+    public function getOwner() {
+
+        return $this->principalUri;
+
+    }
+
+    /**
+     * Returns a group principal
+     *
+     * This must be a url to a principal, or null if there's no owner
+     *
+     * @return string|null
+     */
+    public function getGroup() {
+
+        return null;
+
+    }
+
+    /**
+     * Returns a list of ACE's for this node.
+     *
+     * Each ACE has the following properties:
+     *   * 'privilege', a string such as {DAV:}read or {DAV:}write. These are
+     *     currently the only supported privileges
+     *   * 'principal', a url to the principal who owns the node
+     *   * 'protected' (optional), indicating that this ACE is not allowed to
+     *      be updated.
+     *
+     * @return array
+     */
+    public function getACL() {
+
+        return array(
+            array(
+                'principal' => $this->getOwner(),
+                'privilege' => '{DAV:}read',
+                'protected' => true,
+            ),
+            array(
+                'principal' => $this->getOwner(),
+                'privilege' => '{DAV:}write',
+                'protected' => true,
+            )
+        );
+
+    }
+
+    /**
+     * Updates the ACL
+     *
+     * This method will receive a list of new ACE's as an array argument.
+     *
+     * @param array $acl
+     * @return void
+     */
+    public function setACL(array $acl) {
+
+        throw new Sabre_DAV_Exception_NotImplemented('Updating ACLs is not implemented here');
+
+    }
+
+    /**
+     * Returns the list of supported privileges for this node.
+     *
+     * The returned data structure is a list of nested privileges.
+     * See Sabre_DAVACL_Plugin::getDefaultSupportedPrivilegeSet for a simple
+     * standard structure.
+     *
+     * If null is returned from this method, the default privilege set is used,
+     * which is fine for most common usecases.
+     *
+     * @return array|null
+     */
+    public function getSupportedPrivilegeSet() {
+
+        return null;
+
+    }
+
+}
diff --git a/3rdparty/Sabre/CalDAV/Notifications/ICollection.php b/3rdparty/Sabre/CalDAV/Notifications/ICollection.php
new file mode 100755
index 00000000000..eb873af3f92
--- /dev/null
+++ b/3rdparty/Sabre/CalDAV/Notifications/ICollection.php
@@ -0,0 +1,22 @@
+<?php
+
+/**
+ * This node represents a list of notifications.
+ *
+ * It provides no additional functionality, but you must implement this
+ * interface to allow the Notifications plugin to mark the collection
+ * as a notifications collection.
+ *
+ * This collection should only return Sabre_CalDAV_Notifications_INode nodes as
+ * its children.
+ *
+ * @package Sabre
+ * @subpackage CalDAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+interface Sabre_CalDAV_Notifications_ICollection extends Sabre_DAV_ICollection {
+
+
+}
diff --git a/3rdparty/Sabre/CalDAV/Notifications/INode.php b/3rdparty/Sabre/CalDAV/Notifications/INode.php
new file mode 100755
index 00000000000..84721de5ab7
--- /dev/null
+++ b/3rdparty/Sabre/CalDAV/Notifications/INode.php
@@ -0,0 +1,38 @@
+<?php
+
+/**
+ * This node represents a single notification.
+ *
+ * The signature is mostly identical to that of Sabre_DAV_IFile, but the get() method
+ * MUST return an xml document that matches the requirements of the
+ * 'caldav-notifications.txt' spec.
+ *
+ * For a complete example, check out the Notification class, which contains
+ * some helper functions.
+ *
+ * @package Sabre
+ * @subpackage CalDAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+interface Sabre_CalDAV_Notifications_INode {
+
+    /**
+     * This method must return an xml element, using the
+     * Sabre_CalDAV_Notifications_INotificationType classes.
+     *
+     * @return Sabre_DAVNotification_INotificationType
+     */
+    function getNotificationType();
+
+    /**
+     * Returns the etag for the notification.
+     *
+     * The etag must be surrounded by litteral double-quotes.
+     *
+     * @return string
+     */
+    function getETag();
+
+}
diff --git a/3rdparty/Sabre/CalDAV/Notifications/INotificationType.php b/3rdparty/Sabre/CalDAV/Notifications/INotificationType.php
new file mode 100755
index 00000000000..02a65a01fa3
--- /dev/null
+++ b/3rdparty/Sabre/CalDAV/Notifications/INotificationType.php
@@ -0,0 +1,43 @@
+<?php
+
+/**
+ * This interface reflects a single notification type.
+ *
+ * @package Sabre
+ * @subpackage CalDAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+interface Sabre_CalDAV_Notifications_INotificationType extends Sabre_DAV_PropertyInterface {
+
+    /**
+     * This method serializes the entire notification, as it is used in the
+     * response body.
+     *
+     * @param Sabre_DAV_Server $server
+     * @param DOMElement $node
+     * @return void
+     */
+    function serializeBody(Sabre_DAV_Server $server, \DOMElement $node);
+
+    /**
+     * Returns a unique id for this notification
+     *
+     * This is just the base url. This should generally be some kind of unique
+     * id.
+     *
+     * @return string
+     */
+    function getId();
+
+    /**
+     * Returns the ETag for this notification.
+     *
+     * The ETag must be surrounded by literal double-quotes.
+     *
+     * @return string
+     */
+    function getETag();
+
+}
diff --git a/3rdparty/Sabre/CalDAV/Notifications/Node.php b/3rdparty/Sabre/CalDAV/Notifications/Node.php
new file mode 100755
index 00000000000..8021a75debf
--- /dev/null
+++ b/3rdparty/Sabre/CalDAV/Notifications/Node.php
@@ -0,0 +1,188 @@
+<?php
+
+/**
+ * This node represents a single notification.
+ *
+ * The signature is mostly identical to that of Sabre_DAV_IFile, but the get() method
+ * MUST return an xml document that matches the requirements of the
+ * 'caldav-notifications.txt' spec.
+
+ * @package Sabre
+ * @subpackage CalDAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+class Sabre_CalDAV_Notifications_Node extends Sabre_DAV_File implements Sabre_CalDAV_Notifications_INode, Sabre_DAVACL_IACL {
+
+    /**
+     * The notification backend
+     *
+     * @var Sabre_CalDAV_Backend_NotificationSupport
+     */
+    protected $caldavBackend;
+
+    /**
+     * The actual notification
+     *
+     * @var Sabre_CalDAV_Notifications_INotificationType
+     */
+    protected $notification;
+
+    /**
+     * Owner principal of the notification
+     *
+     * @var string
+     */
+    protected $principalUri;
+
+    /**
+     * Constructor
+     *
+     * @param Sabre_CalDAV_Backend_NotificationSupport $caldavBackend
+     * @param string $principalUri
+     * @param Sabre_CalDAV_Notifications_INotificationType $notification
+     */
+    public function __construct(Sabre_CalDAV_Backend_NotificationSupport $caldavBackend, $principalUri, Sabre_CalDAV_Notifications_INotificationType $notification) {
+
+        $this->caldavBackend = $caldavBackend;
+        $this->principalUri = $principalUri;
+        $this->notification = $notification;
+
+    }
+
+    /**
+     * Returns the path name for this notification
+     *
+     * @return id
+     */
+    public function getName() {
+
+        return $this->notification->getId() . '.xml';
+
+    }
+
+    /**
+     * Returns the etag for the notification.
+     *
+     * The etag must be surrounded by litteral double-quotes.
+     *
+     * @return string
+     */
+    public function getETag() {
+
+        return $this->notification->getETag();
+
+    }
+
+    /**
+     * This method must return an xml element, using the
+     * Sabre_CalDAV_Notifications_INotificationType classes.
+     *
+     * @return Sabre_DAVNotification_INotificationType
+     */
+    public function getNotificationType() {
+
+        return $this->notification;
+
+    }
+
+    /**
+     * Deletes this notification
+     *
+     * @return void
+     */
+    public function delete() {
+
+        $this->caldavBackend->deleteNotification($this->getOwner(), $this->notification);
+
+    }
+
+    /**
+     * Returns the owner principal
+     *
+     * This must be a url to a principal, or null if there's no owner
+     *
+     * @return string|null
+     */
+    public function getOwner() {
+
+        return $this->principalUri;
+
+    }
+
+    /**
+     * Returns a group principal
+     *
+     * This must be a url to a principal, or null if there's no owner
+     *
+     * @return string|null
+     */
+    public function getGroup() {
+
+        return null;
+
+    }
+
+    /**
+     * Returns a list of ACE's for this node.
+     *
+     * Each ACE has the following properties:
+     *   * 'privilege', a string such as {DAV:}read or {DAV:}write. These are
+     *     currently the only supported privileges
+     *   * 'principal', a url to the principal who owns the node
+     *   * 'protected' (optional), indicating that this ACE is not allowed to
+     *      be updated.
+     *
+     * @return array
+     */
+    public function getACL() {
+
+        return array(
+            array(
+                'principal' => $this->getOwner(),
+                'privilege' => '{DAV:}read',
+                'protected' => true,
+            ),
+            array(
+                'principal' => $this->getOwner(),
+                'privilege' => '{DAV:}write',
+                'protected' => true,
+            )
+        );
+
+    }
+
+    /**
+     * Updates the ACL
+     *
+     * This method will receive a list of new ACE's as an array argument.
+     *
+     * @param array $acl
+     * @return void
+     */
+    public function setACL(array $acl) {
+
+        throw new Sabre_DAV_Exception_NotImplemented('Updating ACLs is not implemented here');
+
+    }
+
+    /**
+     * Returns the list of supported privileges for this node.
+     *
+     * The returned data structure is a list of nested privileges.
+     * See Sabre_DAVACL_Plugin::getDefaultSupportedPrivilegeSet for a simple
+     * standard structure.
+     *
+     * If null is returned from this method, the default privilege set is used,
+     * which is fine for most common usecases.
+     *
+     * @return array|null
+     */
+    public function getSupportedPrivilegeSet() {
+
+        return null;
+
+    }
+
+}
diff --git a/3rdparty/Sabre/CalDAV/Notifications/Notification/Invite.php b/3rdparty/Sabre/CalDAV/Notifications/Notification/Invite.php
new file mode 100755
index 00000000000..a6b36203f34
--- /dev/null
+++ b/3rdparty/Sabre/CalDAV/Notifications/Notification/Invite.php
@@ -0,0 +1,276 @@
+<?php
+
+use Sabre_CalDAV_SharingPlugin as SharingPlugin;
+
+/**
+ * This class represents the cs:invite-notification notification element.
+ *
+ * @package Sabre
+ * @subpackage CalDAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+class Sabre_CalDAV_Notifications_Notification_Invite extends Sabre_DAV_Property implements Sabre_CalDAV_Notifications_INotificationType {
+
+    /**
+     * A unique id for the message
+     *
+     * @var string
+     */
+    protected $id;
+
+    /**
+     * Timestamp of the notification
+     *
+     * @var DateTime
+     */
+    protected $dtStamp;
+
+    /**
+     * A url to the recipient of the notification. This can be an email
+     * address (mailto:), or a principal url.
+     *
+     * @var string
+     */
+    protected $href;
+
+    /**
+     * The type of message, see the SharingPlugin::STATUS_* constants.
+     *
+     * @var int
+     */
+    protected $type;
+
+    /**
+     * True if access to a calendar is read-only.
+     *
+     * @var bool
+     */
+    protected $readOnly;
+
+    /**
+     * A url to the shared calendar.
+     *
+     * @var string
+     */
+    protected $hostUrl;
+
+    /**
+     * Url to the sharer of the calendar
+     *
+     * @var string
+     */
+    protected $organizer;
+
+    /**
+     * The name of the sharer.
+     *
+     * @var string
+     */
+    protected $commonName;
+
+    /**
+     * A description of the share request
+     *
+     * @var string
+     */
+    protected $summary;
+
+    /**
+     * The Etag for the notification
+     *
+     * @var string
+     */
+    protected $etag;
+
+    /**
+     * The list of supported components
+     *
+     * @var Sabre_CalDAV_Property_SupportedCalendarComponentSet
+     */
+    protected $supportedComponents;
+
+    /**
+     * Creates the Invite notification.
+     *
+     * This constructor receives an array with the following elements:
+     *
+     *   * id           - A unique id
+     *   * etag         - The etag
+     *   * dtStamp      - A DateTime object with a timestamp for the notification.
+     *   * type         - The type of notification, see SharingPlugin::STATUS_*
+     *                    constants for details.
+     *   * readOnly     - This must be set to true, if this is an invite for
+     *                    read-only access to a calendar.
+     *   * hostUrl      - A url to the shared calendar.
+     *   * organizer    - Url to the sharer principal.
+     *   * commonName   - The real name of the sharer (optional).
+     *   * summary      - Description of the share, can be the same as the
+     *                    calendar, but may also be modified (optional).
+     *   * supportedComponents - An instance of
+     *                    Sabre_CalDAV_Property_SupportedCalendarComponentSet.
+     *                    This allows the client to determine which components
+     *                    will be supported in the shared calendar. This is
+     *                    also optional.
+     *
+     * @param array $values All the options
+     */
+    public function __construct(array $values) {
+
+        $required = array(
+            'id',
+            'etag',
+            'href',
+            'dtStamp',
+            'type',
+            'readOnly',
+            'hostUrl',
+            'organizer',
+        );
+        foreach($required as $item) {
+            if (!isset($values[$item])) {
+                throw new InvalidArgumentException($item . ' is a required constructor option');
+            }
+        }
+
+        foreach($values as $key=>$value) {
+            if (!property_exists($this, $key)) {
+                throw new InvalidArgumentException('Unknown option: ' . $key);
+            }
+            $this->$key = $value;
+        }
+
+    }
+
+    /**
+     * Serializes the notification as a single property.
+     *
+     * You should usually just encode the single top-level element of the
+     * notification.
+     *
+     * @param Sabre_DAV_Server $server
+     * @param DOMElement $node
+     * @return void
+     */
+    public function serialize(Sabre_DAV_Server $server, \DOMElement $node) {
+
+        $prop = $node->ownerDocument->createElement('cs:invite-notification');
+        $node->appendChild($prop);
+
+    }
+
+    /**
+     * This method serializes the entire notification, as it is used in the
+     * response body.
+     *
+     * @param Sabre_DAV_Server $server
+     * @param DOMElement $node
+     * @return void
+     */
+    public function serializeBody(Sabre_DAV_Server $server, \DOMElement $node) {
+
+        $doc = $node->ownerDocument;
+
+        $dt = $doc->createElement('cs:dtstamp');
+        $this->dtStamp->setTimezone(new \DateTimezone('GMT'));
+        $dt->appendChild($doc->createTextNode($this->dtStamp->format('Ymd\\THis\\Z')));
+        $node->appendChild($dt);
+
+        $prop = $doc->createElement('cs:invite-notification');
+        $node->appendChild($prop);
+
+        $uid = $doc->createElement('cs:uid');
+        $uid->appendChild( $doc->createTextNode($this->id) );
+        $prop->appendChild($uid);
+
+        $href = $doc->createElement('d:href');
+        $href->appendChild( $doc->createTextNode( $this->href ) );
+        $prop->appendChild($href);
+
+        $nodeName = null;
+        switch($this->type) {
+
+            case SharingPlugin::STATUS_ACCEPTED :
+                $nodeName = 'cs:invite-accepted';
+                break;
+            case SharingPlugin::STATUS_DECLINED :
+                $nodeName = 'cs:invite-declined';
+                break;
+            case SharingPlugin::STATUS_DELETED :
+                $nodeName = 'cs:invite-deleted';
+                break;
+            case SharingPlugin::STATUS_NORESPONSE :
+                $nodeName = 'cs:invite-noresponse';
+                break;
+
+        }
+        $prop->appendChild(
+            $doc->createElement($nodeName)
+        );
+        $hostHref = $doc->createElement('d:href', $server->getBaseUri() . $this->hostUrl);
+        $hostUrl  = $doc->createElement('cs:hosturl');
+        $hostUrl->appendChild($hostHref);
+        $prop->appendChild($hostUrl);
+
+        $access = $doc->createElement('cs:access');
+        if ($this->readOnly) {
+            $access->appendChild($doc->createElement('cs:read'));
+        } else {
+            $access->appendChild($doc->createElement('cs:read-write'));
+        }
+        $prop->appendChild($access);
+
+        $organizerHref = $doc->createElement('d:href', $server->getBaseUri() . $this->organizer);
+        $organizerUrl  = $doc->createElement('cs:organizer');
+        if ($this->commonName) {
+            $commonName = $doc->createElement('cs:common-name');
+            $commonName->appendChild($doc->createTextNode($this->commonName));
+            $organizerUrl->appendChild($commonName);
+        }
+        $organizerUrl->appendChild($organizerHref);
+        $prop->appendChild($organizerUrl);
+
+        if ($this->summary) {
+            $summary = $doc->createElement('cs:summary');
+            $summary->appendChild($doc->createTextNode($this->summary));
+            $prop->appendChild($summary);
+        }
+        if ($this->supportedComponents) {
+
+            $xcomp = $doc->createElement('cal:supported-calendar-component-set');
+            $this->supportedComponents->serialize($server, $xcomp);
+            $prop->appendChild($xcomp);
+
+        }
+
+    }
+
+    /**
+     * Returns a unique id for this notification
+     *
+     * This is just the base url. This should generally be some kind of unique
+     * id.
+     *
+     * @return string
+     */
+    public function getId() {
+
+        return $this->id;
+
+    }
+
+    /**
+     * Returns the ETag for this notification.
+     *
+     * The ETag must be surrounded by literal double-quotes.
+     *
+     * @return string
+     */
+    public function getETag() {
+
+        return $this->etag;
+
+    }
+
+}
diff --git a/3rdparty/Sabre/CalDAV/Notifications/Notification/InviteReply.php b/3rdparty/Sabre/CalDAV/Notifications/Notification/InviteReply.php
new file mode 100755
index 00000000000..e935aa5aa11
--- /dev/null
+++ b/3rdparty/Sabre/CalDAV/Notifications/Notification/InviteReply.php
@@ -0,0 +1,216 @@
+<?php
+
+use Sabre_CalDAV_SharingPlugin as SharingPlugin;
+
+/**
+ * This class represents the cs:invite-reply notification element.
+ *
+ * @package Sabre
+ * @subpackage CalDAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+class Sabre_CalDAV_Notifications_Notification_InviteReply extends Sabre_DAV_Property implements Sabre_CalDAV_Notifications_INotificationType {
+
+    /**
+     * A unique id for the message
+     *
+     * @var string
+     */
+    protected $id;
+
+    /**
+     * Timestamp of the notification
+     *
+     * @var DateTime
+     */
+    protected $dtStamp;
+
+    /**
+     * The unique id of the notification this was a reply to.
+     *
+     * @var string
+     */
+    protected $inReplyTo;
+
+    /**
+     * A url to the recipient of the original (!) notification.
+     *
+     * @var string
+     */
+    protected $href;
+
+    /**
+     * The type of message, see the SharingPlugin::STATUS_ constants.
+     *
+     * @var int
+     */
+    protected $type;
+
+    /**
+     * A url to the shared calendar.
+     *
+     * @var string
+     */
+    protected $hostUrl;
+
+    /**
+     * A description of the share request
+     *
+     * @var string
+     */
+    protected $summary;
+
+    /**
+     * Notification Etag
+     *
+     * @var string
+     */
+    protected $etag;
+
+    /**
+     * Creates the Invite Reply Notification.
+     *
+     * This constructor receives an array with the following elements:
+     *
+     *   * id           - A unique id
+     *   * etag         - The etag
+     *   * dtStamp      - A DateTime object with a timestamp for the notification.
+     *   * inReplyTo    - This should refer to the 'id' of the notification
+     *                    this is a reply to.
+     *   * type         - The type of notification, see SharingPlugin::STATUS_*
+     *                    constants for details.
+     *   * hostUrl      - A url to the shared calendar.
+     *   * summary      - Description of the share, can be the same as the
+     *                    calendar, but may also be modified (optional).
+     */
+    public function __construct(array $values) {
+
+        $required = array(
+            'id',
+            'etag',
+            'href',
+            'dtStamp',
+            'inReplyTo',
+            'type',
+            'hostUrl',
+        );
+        foreach($required as $item) {
+            if (!isset($values[$item])) {
+                throw new InvalidArgumentException($item . ' is a required constructor option');
+            }
+        }
+
+        foreach($values as $key=>$value) {
+            if (!property_exists($this, $key)) {
+                throw new InvalidArgumentException('Unknown option: ' . $key);
+            }
+            $this->$key = $value;
+        }
+
+    }
+
+    /**
+     * Serializes the notification as a single property.
+     *
+     * You should usually just encode the single top-level element of the
+     * notification.
+     *
+     * @param Sabre_DAV_Server $server
+     * @param DOMElement $node
+     * @return void
+     */
+    public function serialize(Sabre_DAV_Server $server, \DOMElement $node) {
+
+        $prop = $node->ownerDocument->createElement('cs:invite-reply');
+        $node->appendChild($prop);
+
+    }
+
+    /**
+     * This method serializes the entire notification, as it is used in the
+     * response body.
+     *
+     * @param Sabre_DAV_Server $server
+     * @param DOMElement $node
+     * @return void
+     */
+    public function serializeBody(Sabre_DAV_Server $server, \DOMElement $node) {
+
+        $doc = $node->ownerDocument;
+
+        $dt = $doc->createElement('cs:dtstamp');
+        $this->dtStamp->setTimezone(new \DateTimezone('GMT'));
+        $dt->appendChild($doc->createTextNode($this->dtStamp->format('Ymd\\THis\\Z')));
+        $node->appendChild($dt);
+
+        $prop = $doc->createElement('cs:invite-reply');
+        $node->appendChild($prop);
+
+        $uid = $doc->createElement('cs:uid');
+        $uid->appendChild($doc->createTextNode($this->id));
+        $prop->appendChild($uid);
+
+        $inReplyTo = $doc->createElement('cs:in-reply-to');
+        $inReplyTo->appendChild( $doc->createTextNode($this->inReplyTo) );
+        $prop->appendChild($inReplyTo);
+
+        $href = $doc->createElement('d:href');
+        $href->appendChild( $doc->createTextNode($this->href) );
+        $prop->appendChild($href);
+
+        $nodeName = null;
+        switch($this->type) {
+
+            case SharingPlugin::STATUS_ACCEPTED :
+                $nodeName = 'cs:invite-accepted';
+                break;
+            case SharingPlugin::STATUS_DECLINED :
+                $nodeName = 'cs:invite-declined';
+                break;
+
+        }
+        $prop->appendChild(
+            $doc->createElement($nodeName)
+        );
+        $hostHref = $doc->createElement('d:href', $server->getBaseUri() . $this->hostUrl);
+        $hostUrl  = $doc->createElement('cs:hosturl');
+        $hostUrl->appendChild($hostHref);
+        $prop->appendChild($hostUrl);
+
+        if ($this->summary) {
+            $summary = $doc->createElement('cs:summary');
+            $summary->appendChild($doc->createTextNode($this->summary));
+            $prop->appendChild($summary);
+        }
+
+    }
+
+    /**
+     * Returns a unique id for this notification
+     *
+     * This is just the base url. This should generally be some kind of unique
+     * id.
+     *
+     * @return string
+     */
+    public function getId() {
+
+        return $this->id;
+
+    }
+
+    /**
+     * Returns the ETag for this notification.
+     *
+     * The ETag must be surrounded by literal double-quotes.
+     *
+     * @return string
+     */
+    public function getETag() {
+
+        return $this->etag;
+
+    }
+}
diff --git a/3rdparty/Sabre/CalDAV/Notifications/Notification/SystemStatus.php b/3rdparty/Sabre/CalDAV/Notifications/Notification/SystemStatus.php
new file mode 100755
index 00000000000..f09ed3525f5
--- /dev/null
+++ b/3rdparty/Sabre/CalDAV/Notifications/Notification/SystemStatus.php
@@ -0,0 +1,179 @@
+<?php
+
+/**
+ * SystemStatus notification
+ *
+ * This notification can be used to indicate to the user that the system is
+ * down.
+ *
+ * @package Sabre
+ * @subpackage CalDAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+class Sabre_CalDAV_Notifications_Notification_SystemStatus extends Sabre_DAV_Property implements Sabre_CalDAV_Notifications_INotificationType {
+
+    const TYPE_LOW = 1;
+    const TYPE_MEDIUM = 2;
+    const TYPE_HIGH = 3;
+
+    /**
+     * A unique id
+     *
+     * @var string
+     */
+    protected $id;
+
+    /**
+     * The type of alert. This should be one of the TYPE_ constants.
+     *
+     * @var int
+     */
+    protected $type;
+
+    /**
+     * A human-readable description of the problem.
+     *
+     * @var string
+     */
+    protected $description;
+
+    /**
+     * A url to a website with more information for the user.
+     *
+     * @var string
+     */
+    protected $href;
+
+    /**
+     * Notification Etag
+     *
+     * @var string
+     */
+    protected $etag;
+
+    /**
+     * Creates the notification.
+     *
+     * Some kind of unique id should be provided. This is used to generate a
+     * url.
+     *
+     * @param string $id
+     * @param string $etag
+     * @param int $type
+     * @param string $description
+     * @param string $href
+     */
+    public function __construct($id, $etag, $type = self::TYPE_HIGH, $description = null, $href = null) {
+
+        $this->id = $id;
+        $this->type = $type;
+        $this->description = $description;
+        $this->href = $href;
+        $this->etag = $etag;
+
+    }
+
+    /**
+     * Serializes the notification as a single property.
+     *
+     * You should usually just encode the single top-level element of the
+     * notification.
+     *
+     * @param Sabre_DAV_Server $server
+     * @param DOMElement $node
+     * @return void
+     */
+    public function serialize(Sabre_DAV_Server $server, \DOMElement $node) {
+
+        switch($this->type) {
+            case self::TYPE_LOW :
+                $type = 'low';
+                break;
+            case self::TYPE_MEDIUM :
+                $type = 'medium';
+                break;
+            default :
+            case self::TYPE_HIGH :
+                $type = 'high';
+                break;
+        }
+
+        $prop = $node->ownerDocument->createElement('cs:systemstatus');
+        $prop->setAttribute('type', $type);
+
+        $node->appendChild($prop);
+
+    }
+
+    /**
+     * This method serializes the entire notification, as it is used in the
+     * response body.
+     *
+     * @param Sabre_DAV_Server $server
+     * @param DOMElement $node
+     * @return void
+     */
+    public function serializeBody(Sabre_DAV_Server $server, \DOMElement $node) {
+
+        switch($this->type) {
+            case self::TYPE_LOW :
+                $type = 'low';
+                break;
+            case self::TYPE_MEDIUM :
+                $type = 'medium';
+                break;
+            default :
+            case self::TYPE_HIGH :
+                $type = 'high';
+                break;
+        }
+
+        $prop = $node->ownerDocument->createElement('cs:systemstatus');
+        $prop->setAttribute('type', $type);
+
+        if ($this->description) {
+            $text = $node->ownerDocument->createTextNode($this->description);
+            $desc = $node->ownerDocument->createElement('cs:description');
+            $desc->appendChild($text);
+            $prop->appendChild($desc);
+        }
+        if ($this->href) {
+            $text = $node->ownerDocument->createTextNode($this->href);
+            $href = $node->ownerDocument->createElement('d:href');
+            $href->appendChild($text);
+            $prop->appendChild($href);
+        }
+
+        $node->appendChild($prop);
+
+    }
+
+    /**
+     * Returns a unique id for this notification
+     *
+     * This is just the base url. This should generally be some kind of unique
+     * id.
+     *
+     * @return string
+     */
+    public function getId() {
+
+        return $this->id;
+
+    }
+
+    /*
+     * Returns the ETag for this notification.
+     *
+     * The ETag must be surrounded by literal double-quotes.
+     *
+     * @return string
+     */
+    public function getETag() {
+
+        return $this->etag;
+
+    }
+}
diff --git a/3rdparty/Sabre/CalDAV/Plugin.php b/3rdparty/Sabre/CalDAV/Plugin.php
index c56ab384844..f3d11969c8b 100755
--- a/3rdparty/Sabre/CalDAV/Plugin.php
+++ b/3rdparty/Sabre/CalDAV/Plugin.php
@@ -1,5 +1,7 @@
 <?php
 
+use Sabre\VObject;
+
 /**
  * CalDAV plugin
  *
@@ -25,16 +27,6 @@ class Sabre_CalDAV_Plugin extends Sabre_DAV_ServerPlugin {
     const NS_CALENDARSERVER = 'http://calendarserver.org/ns/';
 
     /**
-     * The following constants are used to differentiate
-     * the various filters for the calendar-query report
-     */
-    const FILTER_COMPFILTER   = 1;
-    const FILTER_TIMERANGE    = 3;
-    const FILTER_PROPFILTER   = 4;
-    const FILTER_PARAMFILTER  = 5;
-    const FILTER_TEXTMATCH    = 6;
-
-    /**
      * The hardcoded root for calendar objects. It is unfortunate
      * that we're stuck with it, but it will have to do for now
      */
@@ -172,16 +164,19 @@ class Sabre_CalDAV_Plugin extends Sabre_DAV_ServerPlugin {
         $server->subscribeEvent('onBrowserPostAction', array($this,'browserPostAction'));
         $server->subscribeEvent('beforeWriteContent', array($this, 'beforeWriteContent'));
         $server->subscribeEvent('beforeCreateFile', array($this, 'beforeCreateFile'));
+        $server->subscribeEvent('beforeMethod', array($this,'beforeMethod'));
 
         $server->xmlNamespaces[self::NS_CALDAV] = 'cal';
         $server->xmlNamespaces[self::NS_CALENDARSERVER] = 'cs';
 
         $server->propertyMap['{' . self::NS_CALDAV . '}supported-calendar-component-set'] = 'Sabre_CalDAV_Property_SupportedCalendarComponentSet';
+        $server->propertyMap['{' . self::NS_CALDAV . '}schedule-calendar-transp'] = 'Sabre_CalDAV_Property_ScheduleCalendarTransp';
 
         $server->resourceTypeMapping['Sabre_CalDAV_ICalendar'] = '{urn:ietf:params:xml:ns:caldav}calendar';
         $server->resourceTypeMapping['Sabre_CalDAV_Schedule_IOutbox'] = '{urn:ietf:params:xml:ns:caldav}schedule-outbox';
         $server->resourceTypeMapping['Sabre_CalDAV_Principal_ProxyRead'] = '{http://calendarserver.org/ns/}calendar-proxy-read';
         $server->resourceTypeMapping['Sabre_CalDAV_Principal_ProxyWrite'] = '{http://calendarserver.org/ns/}calendar-proxy-write';
+        $server->resourceTypeMapping['Sabre_CalDAV_Notifications_ICollection'] = '{' . self::NS_CALENDARSERVER . '}notification';
 
         array_push($server->protectedProperties,
 
@@ -205,7 +200,9 @@ class Sabre_CalDAV_Plugin extends Sabre_DAV_ServerPlugin {
             // CalendarServer extensions
             '{' . self::NS_CALENDARSERVER . '}getctag',
             '{' . self::NS_CALENDARSERVER . '}calendar-proxy-read-for',
-            '{' . self::NS_CALENDARSERVER . '}calendar-proxy-write-for'
+            '{' . self::NS_CALENDARSERVER . '}calendar-proxy-write-for',
+            '{' . self::NS_CALENDARSERVER . '}notification-URL',
+            '{' . self::NS_CALENDARSERVER . '}notificationtype'
 
         );
     }
@@ -226,6 +223,13 @@ class Sabre_CalDAV_Plugin extends Sabre_DAV_ServerPlugin {
                 // unknownMethod event.
                 return false;
             case 'POST' :
+
+                // Checking if this is a text/calendar content type
+                $contentType = $this->server->httpRequest->getHeader('Content-Type');
+                if (strpos($contentType, 'text/calendar')!==0) {
+                    return;
+                }
+
                 // Checking if we're talking to an outbox
                 try {
                     $node = $this->server->tree->getNodeForPath($uri);
@@ -235,7 +239,7 @@ class Sabre_CalDAV_Plugin extends Sabre_DAV_ServerPlugin {
                 if (!$node instanceof Sabre_CalDAV_Schedule_IOutbox)
                     return;
 
-                $this->outboxRequest($node);
+                $this->outboxRequest($node, $uri);
                 return false;
 
         }
@@ -348,7 +352,7 @@ class Sabre_CalDAV_Plugin extends Sabre_DAV_ServerPlugin {
             if (in_array($calProp,$requestedProperties)) {
 
                 $addresses = $node->getAlternateUriSet();
-                $addresses[] = $this->server->getBaseUri() . $node->getPrincipalUrl();
+                $addresses[] = $this->server->getBaseUri() . $node->getPrincipalUrl() . '/';
                 unset($requestedProperties[$calProp]);
                 $returnedProperties[200][$calProp] = new Sabre_DAV_Property_HrefList($addresses, false);
 
@@ -390,8 +394,31 @@ class Sabre_CalDAV_Plugin extends Sabre_DAV_ServerPlugin {
 
             }
 
+            // notification-URL property
+            $notificationUrl = '{' . self::NS_CALENDARSERVER . '}notification-URL';
+            if (($index = array_search($notificationUrl, $requestedProperties)) !== false) {
+                $principalId = $node->getName();
+                $calendarHomePath = 'calendars/' . $principalId . '/notifications/';
+                unset($requestedProperties[$index]);
+                $returnedProperties[200][$notificationUrl] = new Sabre_DAV_Property_Href($calendarHomePath);
+            }
+
         } // instanceof IPrincipal
 
+        if ($node instanceof Sabre_CalDAV_Notifications_INode) {
+
+            $propertyName = '{' . self::NS_CALENDARSERVER . '}notificationtype';
+            if (($index = array_search($propertyName, $requestedProperties)) !== false) {
+
+                $returnedProperties[200][$propertyName] =
+                    $node->getNotificationType();
+
+                unset($requestedProperties[$index]);
+
+            }
+
+        } // instanceof Notifications_INode
+
 
         if ($node instanceof Sabre_CalDAV_ICalendarObject) {
             // The calendar-data property is not supposed to be a 'real'
@@ -424,11 +451,11 @@ class Sabre_CalDAV_Plugin extends Sabre_DAV_ServerPlugin {
     public function calendarMultiGetReport($dom) {
 
         $properties = array_keys(Sabre_DAV_XMLUtil::parseProperties($dom->firstChild));
-        $hrefElems = $dom->getElementsByTagNameNS('urn:DAV','href');
+        $hrefElems = $dom->getElementsByTagNameNS('DAV:','href');
 
         $xpath = new DOMXPath($dom);
         $xpath->registerNameSpace('cal',Sabre_CalDAV_Plugin::NS_CALDAV);
-        $xpath->registerNameSpace('dav','urn:DAV');
+        $xpath->registerNameSpace('dav','DAV:');
 
         $expand = $xpath->query('/cal:calendar-multiget/dav:prop/cal:calendar-data/cal:expand');
         if ($expand->length>0) {
@@ -438,8 +465,8 @@ class Sabre_CalDAV_Plugin extends Sabre_DAV_ServerPlugin {
             if(!$start || !$end) {
                 throw new Sabre_DAV_Exception_BadRequest('The "start" and "end" attributes are required for the CALDAV:expand element');
             }
-            $start = Sabre_VObject_DateTimeParser::parseDateTime($start);
-            $end = Sabre_VObject_DateTimeParser::parseDateTime($end);
+            $start = VObject\DateTimeParser::parseDateTime($start);
+            $end = VObject\DateTimeParser::parseDateTime($end);
 
             if ($end <= $start) {
                 throw new Sabre_DAV_Exception_BadRequest('The end-date must be larger than the start-date in the expand element.');
@@ -458,7 +485,7 @@ class Sabre_CalDAV_Plugin extends Sabre_DAV_ServerPlugin {
             list($objProps) = $this->server->getPropertiesForPath($uri,$properties);
 
             if ($expand && isset($objProps[200]['{' . self::NS_CALDAV . '}calendar-data'])) {
-                $vObject = Sabre_VObject_Reader::read($objProps[200]['{' . self::NS_CALDAV . '}calendar-data']);
+                $vObject = VObject\Reader::read($objProps[200]['{' . self::NS_CALDAV . '}calendar-data']);
                 $vObject->expand($start, $end);
                 $objProps[200]['{' . self::NS_CALDAV . '}calendar-data'] = $vObject->serialize();
             }
@@ -467,9 +494,12 @@ class Sabre_CalDAV_Plugin extends Sabre_DAV_ServerPlugin {
 
         }
 
+        $prefer = $this->server->getHTTPPRefer();
+
         $this->server->httpResponse->sendStatus(207);
         $this->server->httpResponse->setHeader('Content-Type','application/xml; charset=utf-8');
-        $this->server->httpResponse->sendBody($this->server->generateMultiStatus($propertyList));
+        $this->server->httpResponse->setHeader('Vary','Brief,Prefer');
+        $this->server->httpResponse->sendBody($this->server->generateMultiStatus($propertyList, $prefer['return-minimal']));
 
     }
 
@@ -487,54 +517,95 @@ class Sabre_CalDAV_Plugin extends Sabre_DAV_ServerPlugin {
         $parser = new Sabre_CalDAV_CalendarQueryParser($dom);
         $parser->parse();
 
-        $requestedCalendarData = true;
-        $requestedProperties = $parser->requestedProperties;
+        $node = $this->server->tree->getNodeForPath($this->server->getRequestUri());
+        $depth = $this->server->getHTTPDepth(0);
 
-        if (!in_array('{urn:ietf:params:xml:ns:caldav}calendar-data', $requestedProperties)) {
+        // The default result is an empty array
+        $result = array();
 
-            // We always retrieve calendar-data, as we need it for filtering.
-            $requestedProperties[] = '{urn:ietf:params:xml:ns:caldav}calendar-data';
+        // The calendarobject was requested directly. In this case we handle
+        // this locally.
+        if ($depth == 0 && $node instanceof Sabre_CalDAV_ICalendarObject) {
 
-            // If calendar-data wasn't explicitly requested, we need to remove
-            // it after processing.
-            $requestedCalendarData = false;
-        }
+            $requestedCalendarData = true;
+            $requestedProperties = $parser->requestedProperties;
 
-        // These are the list of nodes that potentially match the requirement
-        $candidateNodes = $this->server->getPropertiesForPath(
-            $this->server->getRequestUri(),
-            $requestedProperties,
-            $this->server->getHTTPDepth(0)
-        );
+            if (!in_array('{urn:ietf:params:xml:ns:caldav}calendar-data', $requestedProperties)) {
 
-        $verifiedNodes = array();
+                // We always retrieve calendar-data, as we need it for filtering.
+                $requestedProperties[] = '{urn:ietf:params:xml:ns:caldav}calendar-data';
 
-        $validator = new Sabre_CalDAV_CalendarQueryValidator();
+                // If calendar-data wasn't explicitly requested, we need to remove
+                // it after processing.
+                $requestedCalendarData = false;
+            }
 
-        foreach($candidateNodes as $node) {
+            $properties = $this->server->getPropertiesForPath(
+                $this->server->getRequestUri(),
+                $requestedProperties,
+                0
+            );
 
-            // If the node didn't have a calendar-data property, it must not be a calendar object
-            if (!isset($node[200]['{urn:ietf:params:xml:ns:caldav}calendar-data']))
-                continue;
+            // This array should have only 1 element, the first calendar
+            // object.
+            $properties = current($properties);
 
-            $vObject = Sabre_VObject_Reader::read($node[200]['{urn:ietf:params:xml:ns:caldav}calendar-data']);
-            if ($validator->validate($vObject,$parser->filters)) {
+            // If there wasn't any calendar-data returned somehow, we ignore
+            // this.
+            if (isset($properties[200]['{urn:ietf:params:xml:ns:caldav}calendar-data'])) {
+
+                $validator = new Sabre_CalDAV_CalendarQueryValidator();
+                $vObject = VObject\Reader::read($properties[200]['{urn:ietf:params:xml:ns:caldav}calendar-data']);
+                if ($validator->validate($vObject,$parser->filters)) {
+
+                    // If the client didn't require the calendar-data property,
+                    // we won't give it back.
+                    if (!$requestedCalendarData) {
+                        unset($properties[200]['{urn:ietf:params:xml:ns:caldav}calendar-data']);
+                    } else {
+                        if ($parser->expand) {
+                            $vObject->expand($parser->expand['start'], $parser->expand['end']);
+                            $properties[200]['{' . self::NS_CALDAV . '}calendar-data'] = $vObject->serialize();
+                        }
+                    }
+
+                    $result = array($properties);
 
-                if (!$requestedCalendarData) {
-                    unset($node[200]['{urn:ietf:params:xml:ns:caldav}calendar-data']);
                 }
+
+            }
+
+        }
+        // If we're dealing with a calendar, the calendar itself is responsible
+        // for the calendar-query.
+        if ($node instanceof Sabre_CalDAV_ICalendar && $depth = 1) {
+
+            $nodePaths = $node->calendarQuery($parser->filters);
+
+            foreach($nodePaths as $path) {
+
+                list($properties) =
+                    $this->server->getPropertiesForPath($this->server->getRequestUri() . '/' . $path, $parser->requestedProperties);
+
                 if ($parser->expand) {
+                    // We need to do some post-processing
+                    $vObject = VObject\Reader::read($properties[200]['{urn:ietf:params:xml:ns:caldav}calendar-data']);
                     $vObject->expand($parser->expand['start'], $parser->expand['end']);
-                    $node[200]['{' . self::NS_CALDAV . '}calendar-data'] = $vObject->serialize();
+                    $properties[200]['{' . self::NS_CALDAV . '}calendar-data'] = $vObject->serialize();
                 }
-                $verifiedNodes[] = $node;
+
+                $result[] = $properties;
+
             }
 
         }
 
+        $prefer = $this->server->getHTTPPRefer();
+
         $this->server->httpResponse->sendStatus(207);
         $this->server->httpResponse->setHeader('Content-Type','application/xml; charset=utf-8');
-        $this->server->httpResponse->sendBody($this->server->generateMultiStatus($verifiedNodes));
+        $this->server->httpResponse->setHeader('Vary','Brief,Prefer');
+        $this->server->httpResponse->sendBody($this->server->generateMultiStatus($result, $prefer['return-minimal']));
 
     }
 
@@ -561,10 +632,10 @@ class Sabre_CalDAV_Plugin extends Sabre_DAV_ServerPlugin {
 
         }
         if ($start) {
-            $start = Sabre_VObject_DateTimeParser::parseDateTime($start);
+            $start = VObject\DateTimeParser::parseDateTime($start);
         }
         if ($end) {
-            $end = Sabre_VObject_DateTimeParser::parseDateTime($end);
+            $end = VObject\DateTimeParser::parseDateTime($end);
         }
 
         if (!$start && !$end) {
@@ -583,15 +654,33 @@ class Sabre_CalDAV_Plugin extends Sabre_DAV_ServerPlugin {
             throw new Sabre_DAV_Exception_NotImplemented('The free-busy-query REPORT is only implemented on calendars');
         }
 
-        $objects = array_map(function($child) {
-            $obj = $child->get();
-            if (is_resource($obj)) {
-                $obj = stream_get_contents($obj);
-            }
+        // Doing a calendar-query first, to make sure we get the most
+        // performance.
+        $urls = $calendar->calendarQuery(array(
+            'name' => 'VCALENDAR',
+            'comp-filters' => array(
+                array(
+                    'name' => 'VEVENT',
+                    'comp-filters' => array(),
+                    'prop-filters' => array(),
+                    'is-not-defined' => false,
+                    'time-range' => array(
+                        'start' => $start,
+                        'end' => $end,
+                    ),
+                ),
+            ),
+            'prop-filters' => array(),
+            'is-not-defined' => false,
+            'time-range' => null,
+        ));
+
+        $objects = array_map(function($url) use ($calendar) {
+            $obj = $calendar->getChild($url)->get();
             return $obj;
-        }, $calendar->getChildren());
+        }, $urls);
 
-        $generator = new Sabre_VObject_FreeBusyGenerator();
+        $generator = new VObject\FreeBusyGenerator();
         $generator->setObjects($objects);
         $generator->setTimeRange($start, $end);
         $result = $generator->getResult();
@@ -620,7 +709,7 @@ class Sabre_CalDAV_Plugin extends Sabre_DAV_ServerPlugin {
         if (!$node instanceof Sabre_CalDAV_ICalendarObject)
             return;
 
-        $this->validateICalendar($data);
+        $this->validateICalendar($data, $path);
 
     }
 
@@ -640,7 +729,52 @@ class Sabre_CalDAV_Plugin extends Sabre_DAV_ServerPlugin {
         if (!$parentNode instanceof Sabre_CalDAV_Calendar)
             return;
 
-        $this->validateICalendar($data);
+        $this->validateICalendar($data, $path);
+
+    }
+
+    /**
+     * This event is triggered before any HTTP request is handled.
+     *
+     * We use this to intercept GET calls to notification nodes, and return the
+     * proper response.
+     *
+     * @param string $method
+     * @param string $path
+     * @return void
+     */
+    public function beforeMethod($method, $path) {
+
+        if ($method!=='GET') return;
+
+        try {
+            $node = $this->server->tree->getNodeForPath($path);
+        } catch (Sabre_DAV_Exception_NotFound $e) {
+            return;
+        }
+
+        if (!$node instanceof Sabre_CalDAV_Notifications_INode)
+            return;
+
+        if (!$this->server->checkPreconditions(true)) return false;
+
+        $dom = new DOMDocument('1.0', 'UTF-8');
+        $dom->formatOutput = true;
+
+        $root = $dom->createElement('cs:notification');
+        foreach($this->server->xmlNamespaces as $namespace => $prefix) {
+            $root->setAttribute('xmlns:' . $prefix, $namespace);
+        }
+
+        $dom->appendChild($root);
+        $node->getNotificationType()->serializeBody($this->server, $root);
+
+        $this->server->httpResponse->setHeader('Content-Type','application/xml');
+        $this->server->httpResponse->setHeader('ETag',$node->getETag());
+        $this->server->httpResponse->sendStatus(200);
+        $this->server->httpResponse->sendBody($dom->saveXML());
+
+        return false;
 
     }
 
@@ -650,9 +784,10 @@ class Sabre_CalDAV_Plugin extends Sabre_DAV_ServerPlugin {
      * An exception is thrown if it's not.
      *
      * @param resource|string $data
+     * @param string $path
      * @return void
      */
-    protected function validateICalendar(&$data) {
+    protected function validateICalendar(&$data, $path) {
 
         // If it's a stream, we convert it to a string first.
         if (is_resource($data)) {
@@ -664,9 +799,9 @@ class Sabre_CalDAV_Plugin extends Sabre_DAV_ServerPlugin {
 
         try {
 
-            $vobj = Sabre_VObject_Reader::read($data);
+            $vobj = VObject\Reader::read($data);
 
-        } catch (Sabre_VObject_ParseException $e) {
+        } catch (VObject\ParseException $e) {
 
             throw new Sabre_DAV_Exception_UnsupportedMediaType('This resource only supports valid iCalendar 2.0 data. Parse error: ' . $e->getMessage());
 
@@ -676,6 +811,11 @@ class Sabre_CalDAV_Plugin extends Sabre_DAV_ServerPlugin {
             throw new Sabre_DAV_Exception_UnsupportedMediaType('This collection can only support iCalendar objects.');
         }
 
+        // Get the Supported Components for the target calendar
+        list($parentPath,$object) = Sabre_Dav_URLUtil::splitPath($path);
+        $calendarProperties = $this->server->getProperties($parentPath,array('{urn:ietf:params:xml:ns:caldav}supported-calendar-component-set'));
+        $supportedComponents = $calendarProperties['{urn:ietf:params:xml:ns:caldav}supported-calendar-component-set']->getValue();
+
         $foundType = null;
         $foundUID = null;
         foreach($vobj->getComponents() as $component) {
@@ -687,6 +827,9 @@ class Sabre_CalDAV_Plugin extends Sabre_DAV_ServerPlugin {
                 case 'VJOURNAL' :
                     if (is_null($foundType)) {
                         $foundType = $component->name;
+                        if (!in_array($foundType, $supportedComponents)) {
+                            throw new Sabre_CalDAV_Exception_InvalidComponentType('This calendar only supports ' . implode(', ', $supportedComponents) . '. We found a ' . $foundType);
+                        }
                         if (!isset($component->UID)) {
                             throw new Sabre_DAV_Exception_BadRequest('Every ' . $component->name . ' component must have an UID');
                         }
@@ -711,12 +854,81 @@ class Sabre_CalDAV_Plugin extends Sabre_DAV_ServerPlugin {
     }
 
     /**
-     * This method handles POST requests to the schedule-outbox
+     * This method handles POST requests to the schedule-outbox.
+     *
+     * Currently, two types of requests are support:
+     *   * FREEBUSY requests from RFC 6638
+     *   * Simple iTIP messages from draft-desruisseaux-caldav-sched-04
+     *
+     * The latter is from an expired early draft of the CalDAV scheduling
+     * extensions, but iCal depends on a feature from that spec, so we
+     * implement it.
      *
      * @param Sabre_CalDAV_Schedule_IOutbox $outboxNode
+     * @param string $outboxUri
+     * @return void
+     */
+    public function outboxRequest(Sabre_CalDAV_Schedule_IOutbox $outboxNode, $outboxUri) {
+
+        // Parsing the request body
+        try {
+            $vObject = VObject\Reader::read($this->server->httpRequest->getBody(true));
+        } catch (VObject\ParseException $e) {
+            throw new Sabre_DAV_Exception_BadRequest('The request body must be a valid iCalendar object. Parse error: ' . $e->getMessage());
+        }
+
+        // The incoming iCalendar object must have a METHOD property, and a
+        // component. The combination of both determines what type of request
+        // this is.
+        $componentType = null;
+        foreach($vObject->getComponents() as $component) {
+            if ($component->name !== 'VTIMEZONE') {
+                $componentType = $component->name;
+                break;
+            }
+        }
+        if (is_null($componentType)) {
+            throw new Sabre_DAV_Exception_BadRequest('We expected at least one VTODO, VJOURNAL, VFREEBUSY or VEVENT component');
+        }
+
+        // Validating the METHOD
+        $method = strtoupper((string)$vObject->METHOD);
+        if (!$method) {
+            throw new Sabre_DAV_Exception_BadRequest('A METHOD property must be specified in iTIP messages');
+        }
+
+        // So we support two types of requests:
+        //
+        // REQUEST with a VFREEBUSY component
+        // REQUEST, REPLY, ADD, CANCEL on VEVENT components
+
+        $acl = $this->server->getPlugin('acl');
+
+        if ($componentType === 'VFREEBUSY' && $method === 'REQUEST') {
+
+            $acl && $acl->checkPrivileges($outboxUri,'{' . Sabre_CalDAV_Plugin::NS_CALDAV . '}schedule-query-freebusy');
+            $this->handleFreeBusyRequest($outboxNode, $vObject);
+
+        } elseif ($componentType === 'VEVENT' && in_array($method, array('REQUEST','REPLY','ADD','CANCEL'))) {
+
+            $acl && $acl->checkPrivileges($outboxUri,'{' . Sabre_CalDAV_Plugin::NS_CALDAV . '}schedule-post-vevent');
+            $this->handleEventNotification($outboxNode, $vObject);
+
+        } else {
+
+            throw new Sabre_DAV_Exception_NotImplemented('SabreDAV supports only VFREEBUSY (REQUEST) and VEVENT (REQUEST, REPLY, ADD, CANCEL)');
+
+        }
+
+    }
+
+    /**
+     * This method handles the REQUEST, REPLY, ADD and CANCEL methods for
+     * VEVENT iTip messages.
+     *
      * @return void
      */
-    public function outboxRequest(Sabre_CalDAV_Schedule_IOutbox $outboxNode) {
+    protected function handleEventNotification(Sabre_CalDAV_Schedule_IOutbox $outboxNode, VObject\Component $vObject) {
 
         $originator = $this->server->httpRequest->getHeader('Originator');
         $recipients = $this->server->httpRequest->getHeader('Recipient');
@@ -760,38 +972,10 @@ class Sabre_CalDAV_Plugin extends Sabre_DAV_ServerPlugin {
             throw new Sabre_DAV_Exception_Forbidden('The addresses specified in the Originator header did not match any addresses in the owners calendar-user-address-set header');
         }
 
-        try {
-            $vObject = Sabre_VObject_Reader::read($this->server->httpRequest->getBody(true));
-        } catch (Sabre_VObject_ParseException $e) {
-            throw new Sabre_DAV_Exception_BadRequest('The request body must be a valid iCalendar object. Parse error: ' . $e->getMessage());
-        }
-
-        // Checking for the object type
-        $componentType = null;
-        foreach($vObject->getComponents() as $component) {
-            if ($component->name !== 'VTIMEZONE') {
-                $componentType = $component->name;
-                break;
-            }
-        }
-        if (is_null($componentType)) {
-            throw new Sabre_DAV_Exception_BadRequest('We expected at least one VTODO, VJOURNAL, VFREEBUSY or VEVENT component');
-        }
-
-        // Validating the METHOD
-        $method = strtoupper((string)$vObject->METHOD);
-        if (!$method) {
-            throw new Sabre_DAV_Exception_BadRequest('A METHOD property must be specified in iTIP messages');
-        }
-
-        if (in_array($method, array('REQUEST','REPLY','ADD','CANCEL')) && $componentType==='VEVENT') {
-            $result = $this->iMIPMessage($originator, $recipients, $vObject);
-            $this->server->httpResponse->sendStatus(200);
-            $this->server->httpResponse->setHeader('Content-Type','application/xml');
-            $this->server->httpResponse->sendBody($this->generateScheduleResponse($result));
-        } else {
-            throw new Sabre_DAV_Exception_NotImplemented('This iTIP method is currently not implemented');
-        }
+        $result = $this->iMIPMessage($originator, $recipients, $vObject, $principal);
+        $this->server->httpResponse->sendStatus(200);
+        $this->server->httpResponse->setHeader('Content-Type','application/xml');
+        $this->server->httpResponse->sendBody($this->generateScheduleResponse($result));
 
     }
 
@@ -813,15 +997,15 @@ class Sabre_CalDAV_Plugin extends Sabre_DAV_ServerPlugin {
      *
      * @param string $originator
      * @param array $recipients
-     * @param Sabre_VObject_Component $vObject
+     * @param Sabre\VObject\Component $vObject
      * @return array
      */
-    protected function iMIPMessage($originator, array $recipients, Sabre_VObject_Component $vObject) {
+    protected function iMIPMessage($originator, array $recipients, VObject\Component $vObject, $principal) {
 
         if (!$this->imipHandler) {
             $resultStatus = '5.2;This server does not support this operation';
         } else {
-            $this->imipHandler->sendMessage($originator, $recipients, $vObject);
+            $this->imipHandler->sendMessage($originator, $recipients, $vObject, $principal);
             $resultStatus = '2.0;Success';
         }
 
@@ -832,7 +1016,6 @@ class Sabre_CalDAV_Plugin extends Sabre_DAV_ServerPlugin {
 
         return $result;
 
-
     }
 
     /**
@@ -878,6 +1061,204 @@ class Sabre_CalDAV_Plugin extends Sabre_DAV_ServerPlugin {
     }
 
     /**
+     * This method is responsible for parsing a free-busy query request and
+     * returning it's result.
+     *
+     * @param Sabre_CalDAV_Schedule_IOutbox $outbox
+     * @param string $request
+     * @return string
+     */
+    protected function handleFreeBusyRequest(Sabre_CalDAV_Schedule_IOutbox $outbox, VObject\Component $vObject) {
+
+        $vFreeBusy = $vObject->VFREEBUSY;
+        $organizer = $vFreeBusy->organizer;
+
+        $organizer = (string)$organizer;
+
+        // Validating if the organizer matches the owner of the inbox.
+        $owner = $outbox->getOwner();
+
+        $caldavNS = '{' . Sabre_CalDAV_Plugin::NS_CALDAV . '}';
+
+        $uas = $caldavNS . 'calendar-user-address-set';
+        $props = $this->server->getProperties($owner,array($uas));
+
+        if (empty($props[$uas]) || !in_array($organizer, $props[$uas]->getHrefs())) {
+            throw new Sabre_DAV_Exception_Forbidden('The organizer in the request did not match any of the addresses for the owner of this inbox');
+        }
+
+        if (!isset($vFreeBusy->ATTENDEE)) {
+            throw new Sabre_DAV_Exception_BadRequest('You must at least specify 1 attendee');
+        }
+
+        $attendees = array();
+        foreach($vFreeBusy->ATTENDEE as $attendee) {
+            $attendees[]= (string)$attendee;
+        }
+
+
+        if (!isset($vFreeBusy->DTSTART) || !isset($vFreeBusy->DTEND)) {
+            throw new Sabre_DAV_Exception_BadRequest('DTSTART and DTEND must both be specified');
+        }
+
+        $startRange = $vFreeBusy->DTSTART->getDateTime();
+        $endRange = $vFreeBusy->DTEND->getDateTime();
+
+        $results = array();
+        foreach($attendees as $attendee) {
+            $results[] = $this->getFreeBusyForEmail($attendee, $startRange, $endRange, $vObject);
+        }
+
+        $dom = new DOMDocument('1.0','utf-8');
+        $dom->formatOutput = true;
+        $scheduleResponse = $dom->createElement('cal:schedule-response');
+        foreach($this->server->xmlNamespaces as $namespace=>$prefix) {
+
+            $scheduleResponse->setAttribute('xmlns:' . $prefix,$namespace);
+
+        }
+        $dom->appendChild($scheduleResponse);
+
+        foreach($results as $result) {
+            $response = $dom->createElement('cal:response');
+
+            $recipient = $dom->createElement('cal:recipient');
+            $recipientHref = $dom->createElement('d:href');
+
+            $recipientHref->appendChild($dom->createTextNode($result['href']));
+            $recipient->appendChild($recipientHref);
+            $response->appendChild($recipient);
+
+            $reqStatus = $dom->createElement('cal:request-status');
+            $reqStatus->appendChild($dom->createTextNode($result['request-status']));
+            $response->appendChild($reqStatus);
+
+            if (isset($result['calendar-data'])) {
+
+                $calendardata = $dom->createElement('cal:calendar-data');
+                $calendardata->appendChild($dom->createTextNode(str_replace("\r\n","\n",$result['calendar-data']->serialize())));
+                $response->appendChild($calendardata);
+
+            }
+            $scheduleResponse->appendChild($response);
+        }
+
+        $this->server->httpResponse->sendStatus(200);
+        $this->server->httpResponse->setHeader('Content-Type','application/xml');
+        $this->server->httpResponse->sendBody($dom->saveXML());
+
+    }
+
+    /**
+     * Returns free-busy information for a specific address. The returned
+     * data is an array containing the following properties:
+     *
+     * calendar-data : A VFREEBUSY VObject
+     * request-status : an iTip status code.
+     * href: The principal's email address, as requested
+     *
+     * The following request status codes may be returned:
+     *   * 2.0;description
+     *   * 3.7;description
+     *
+     * @param string $email address
+     * @param DateTime $start
+     * @param DateTime $end
+     * @param Sabre_VObject_Component $request
+     * @return Sabre_VObject_Component
+     */
+    protected function getFreeBusyForEmail($email, DateTime $start, DateTime $end, VObject\Component $request) {
+
+        $caldavNS = '{' . Sabre_CalDAV_Plugin::NS_CALDAV . '}';
+
+        $aclPlugin = $this->server->getPlugin('acl');
+        if (substr($email,0,7)==='mailto:') $email = substr($email,7);
+
+        $result = $aclPlugin->principalSearch(
+            array('{http://sabredav.org/ns}email-address' => $email),
+            array(
+                '{DAV:}principal-URL', $caldavNS . 'calendar-home-set',
+                '{http://sabredav.org/ns}email-address',
+            )
+        );
+
+        if (!count($result)) {
+            return array(
+                'request-status' => '3.7;Could not find principal',
+                'href' => 'mailto:' . $email,
+            );
+        }
+
+        if (!isset($result[0][200][$caldavNS . 'calendar-home-set'])) {
+            return array(
+                'request-status' => '3.7;No calendar-home-set property found',
+                'href' => 'mailto:' . $email,
+            );
+        }
+        $homeSet = $result[0][200][$caldavNS . 'calendar-home-set']->getHref();
+
+        // Grabbing the calendar list
+        $objects = array();
+        foreach($this->server->tree->getNodeForPath($homeSet)->getChildren() as $node) {
+            if (!$node instanceof Sabre_CalDAV_ICalendar) {
+                continue;
+            }
+            $aclPlugin->checkPrivileges($homeSet . $node->getName() ,$caldavNS . 'read-free-busy');
+
+            // Getting the list of object uris within the time-range
+            $urls = $node->calendarQuery(array(
+                'name' => 'VCALENDAR',
+                'comp-filters' => array(
+                    array(
+                        'name' => 'VEVENT',
+                        'comp-filters' => array(),
+                        'prop-filters' => array(),
+                        'is-not-defined' => false,
+                        'time-range' => array(
+                            'start' => $start,
+                            'end' => $end,
+                        ),
+                    ),
+                ),
+                'prop-filters' => array(),
+                'is-not-defined' => false,
+                'time-range' => null,
+            ));
+
+            $calObjects = array_map(function($url) use ($node) {
+                $obj = $node->getChild($url)->get();
+                return $obj;
+            }, $urls);
+
+            $objects = array_merge($objects,$calObjects);
+
+        }
+
+        $vcalendar = VObject\Component::create('VCALENDAR');
+        $vcalendar->VERSION = '2.0';
+        $vcalendar->METHOD = 'REPLY';
+        $vcalendar->CALSCALE = 'GREGORIAN';
+        $vcalendar->PRODID = '-//SabreDAV//SabreDAV ' . Sabre_DAV_Version::VERSION . '//EN';
+
+        $generator = new VObject\FreeBusyGenerator();
+        $generator->setObjects($objects);
+        $generator->setTimeRange($start, $end);
+        $generator->setBaseObject($vcalendar);
+
+        $result = $generator->getResult();
+
+        $vcalendar->VFREEBUSY->ATTENDEE = 'mailto:' . $email;
+        $vcalendar->VFREEBUSY->UID = (string)$request->VFREEBUSY->UID;
+        $vcalendar->VFREEBUSY->ORGANIZER = clone $request->VFREEBUSY->ORGANIZER;
+
+        return array(
+            'calendar-data' => $result,
+            'request-status' => '2.0;Success',
+            'href' => 'mailto:' . $email,
+        );
+    }
+
+    /**
      * This method is used to generate HTML output for the
      * Sabre_DAV_Browser_Plugin. This allows us to generate an interface users
      * can use to create new calendars.
diff --git a/3rdparty/Sabre/CalDAV/Property/AllowedSharingModes.php b/3rdparty/Sabre/CalDAV/Property/AllowedSharingModes.php
new file mode 100755
index 00000000000..efe751732c5
--- /dev/null
+++ b/3rdparty/Sabre/CalDAV/Property/AllowedSharingModes.php
@@ -0,0 +1,72 @@
+<?php
+
+/**
+ * AllowedSharingModes
+ *
+ * This property encodes the 'allowed-sharing-modes' property, as defined by
+ * the 'caldav-sharing-02' spec, in the http://calendarserver.org/ns/
+ * namespace.
+ *
+ * This property is a representation of the supported-calendar_component-set
+ * property in the CalDAV namespace. It simply requires an array of components,
+ * such as VEVENT, VTODO
+ *
+ * @package Sabre
+ * @subpackage CalDAV
+ * @see https://trac.calendarserver.org/browser/CalendarServer/trunk/doc/Extensions/caldav-sharing-02.txt
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+class Sabre_CalDAV_Property_AllowedSharingModes extends Sabre_DAV_Property {
+
+    /**
+     * Whether or not a calendar can be shared with another user
+     *
+     * @var bool
+     */
+    protected $canBeShared;
+
+    /**
+     * Whether or not the calendar can be placed on a public url.
+     *
+     * @var bool
+     */
+    protected $canBePublished;
+
+    /**
+     * Constructor
+     *
+     * @param bool $canBeShared
+     * @param bool $canBePublished
+     * @return void
+     */
+    public function __construct($canBeShared, $canBePublished) {
+
+        $this->canBeShared = $canBeShared;
+        $this->canBePublished = $canBePublished;
+
+    }
+
+    /**
+     * Serializes the property in a DOMDocument
+     *
+     * @param Sabre_DAV_Server $server
+     * @param DOMElement $node
+     * @return void
+     */
+    public function serialize(Sabre_DAV_Server $server,DOMElement $node) {
+
+       $doc = $node->ownerDocument;
+       if ($this->canBeShared) {
+            $xcomp = $doc->createElement('cs:can-be-shared');
+            $node->appendChild($xcomp);
+       }
+       if ($this->canBePublished) {
+            $xcomp = $doc->createElement('cs:can-be-published');
+            $node->appendChild($xcomp);
+       }
+
+    }
+
+}
diff --git a/3rdparty/Sabre/CalDAV/Property/Invite.php b/3rdparty/Sabre/CalDAV/Property/Invite.php
new file mode 100755
index 00000000000..4ed94877df2
--- /dev/null
+++ b/3rdparty/Sabre/CalDAV/Property/Invite.php
@@ -0,0 +1,173 @@
+<?php
+
+use Sabre_CalDAV_SharingPlugin as SharingPlugin;
+
+/**
+ * Invite property
+ *
+ * This property encodes the 'invite' property, as defined by
+ * the 'caldav-sharing-02' spec, in the http://calendarserver.org/ns/
+ * namespace.
+ *
+ * @package Sabre
+ * @subpackage CalDAV
+ * @see https://trac.calendarserver.org/browser/CalendarServer/trunk/doc/Extensions/caldav-sharing-02.txt
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+class Sabre_CalDAV_Property_Invite extends Sabre_DAV_Property {
+
+    /**
+     * The list of users a calendar has been shared to.
+     *
+     * @var array
+     */
+    protected $users;
+
+    /**
+     * Creates the property.
+     *
+     * Users is an array. Each element of the array has the following
+     * properties:
+     *
+     *   * href - Often a mailto: address
+     *   * commonName - Optional, for example a first and lastname for a user.
+     *   * status - One of the SharingPlugin::STATUS_* constants.
+     *   * readOnly - true or false
+     *   * summary - Optional, description of the share
+     *
+     * @param array $users
+     */
+    public function __construct(array $users) {
+
+        $this->users = $users;
+
+    }
+
+    /**
+     * Returns the list of users, as it was passed to the constructor.
+     *
+     * @return array
+     */
+    public function getValue() {
+
+        return $this->users;
+
+    }
+
+    /**
+     * Serializes the property in a DOMDocument
+     *
+     * @param Sabre_DAV_Server $server
+     * @param DOMElement $node
+     * @return void
+     */
+    public function serialize(Sabre_DAV_Server $server,DOMElement $node) {
+
+       $doc = $node->ownerDocument;
+       foreach($this->users as $user) {
+
+           $xuser = $doc->createElement('cs:user');
+
+           $href = $doc->createElement('d:href');
+           $href->appendChild($doc->createTextNode($user['href']));
+           $xuser->appendChild($href);
+
+           if (isset($user['commonName']) && $user['commonName']) {
+               $commonName = $doc->createElement('cs:common-name');
+               $commonName->appendChild($doc->createTextNode($user['commonName']));
+               $xuser->appendChild($commonName);
+           }
+
+           switch($user['status']) {
+
+               case SharingPlugin::STATUS_ACCEPTED :
+                   $status = $doc->createElement('cs:invite-accepted');
+                   $xuser->appendChild($status);
+                   break;
+               case SharingPlugin::STATUS_DECLINED :
+                   $status = $doc->createElement('cs:invite-declined');
+                   $xuser->appendChild($status);
+                   break;
+               case SharingPlugin::STATUS_NORESPONSE :
+                   $status = $doc->createElement('cs:invite-noresponse');
+                   $xuser->appendChild($status);
+                   break;
+               case SharingPlugin::STATUS_INVALID :
+                   $status = $doc->createElement('cs:invite-invalid');
+                   $xuser->appendChild($status);
+                   break;
+
+           }
+
+           $xaccess = $doc->createElement('cs:access');
+
+           if ($user['readOnly']) {
+                $xaccess->appendChild(
+                    $doc->createElement('cs:read')
+                );
+           } else {
+                $xaccess->appendChild(
+                    $doc->createElement('cs:read-write')
+                );
+           }
+           $xuser->appendChild($xaccess);
+
+           if (isset($user['summary']) && $user['summary']) {
+               $summary = $doc->createElement('cs:summary');
+               $summary->appendChild($doc->createTextNode($user['summary']));
+               $xuser->appendChild($summary);
+           }
+
+           $node->appendChild($xuser);
+
+       }
+
+    }
+
+    /**
+     * Unserializes the property.
+     *
+     * This static method should return a an instance of this object.
+     *
+     * @param DOMElement $prop
+     * @return Sabre_DAV_IProperty
+     */
+    static function unserialize(DOMElement $prop) {
+
+        $xpath = new \DOMXPath($prop->ownerDocument);
+        $xpath->registerNamespace('cs', Sabre_CalDAV_Plugin::NS_CALENDARSERVER);
+        $xpath->registerNamespace('d',  'DAV:');
+
+        $users = array();
+
+        foreach($xpath->query('cs:user', $prop) as $user) {
+
+            $status = null;
+            if ($xpath->evaluate('boolean(cs:invite-accepted)', $user)) {
+                $status = SharingPlugin::STATUS_ACCEPTED;
+            } elseif ($xpath->evaluate('boolean(cs:invite-declined)', $user)) {
+                $status = SharingPlugin::STATUS_DECLINED;
+            } elseif ($xpath->evaluate('boolean(cs:invite-noresponse)', $user)) {
+                $status = SharingPlugin::STATUS_NORESPONSE;
+            } elseif ($xpath->evaluate('boolean(cs:invite-invalid)', $user)) {
+                $status = SharingPlugin::STATUS_INVALID;
+            } else {
+                throw new Sabre_DAV_Exception('Every cs:user property must have one of cs:invite-accepted, cs:invite-declined, cs:invite-noresponse or cs:invite-invalid');
+            }
+            $users[] = array(
+                'href' => $xpath->evaluate('string(d:href)', $user),
+                'commonName' => $xpath->evaluate('string(cs:common-name)', $user),
+                'readOnly' => $xpath->evaluate('boolean(cs:access/cs:read)', $user),
+                'summary' => $xpath->evaluate('string(cs:summary)', $user),
+                'status' => $status,
+            );
+
+        }
+
+        return new self($users);
+
+    }
+
+}
diff --git a/3rdparty/Sabre/CalDAV/Property/ScheduleCalendarTransp.php b/3rdparty/Sabre/CalDAV/Property/ScheduleCalendarTransp.php
new file mode 100755
index 00000000000..76c1dbaec21
--- /dev/null
+++ b/3rdparty/Sabre/CalDAV/Property/ScheduleCalendarTransp.php
@@ -0,0 +1,99 @@
+<?php
+
+/**
+ * schedule-calendar-transp property.
+ *
+ * This property is a representation of the schedule-calendar-transp property.
+ * This property is defined in RFC6638 (caldav scheduling).
+ *
+ * Its values are either 'transparent' or 'opaque'. If it's transparent, it
+ * means that this calendar will not be taken into consideration when a
+ * different user queries for free-busy information. If it's 'opaque', it will.
+ *
+ * @package Sabre
+ * @subpackage CalDAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+class Sabre_CalDAV_Property_ScheduleCalendarTransp extends Sabre_DAV_Property {
+
+    const TRANSPARENT = 'transparent';
+    const OPAQUE = 'opaque';
+
+    protected $value;
+
+    /**
+     * Creates the property
+     *
+     * @param string $value
+     */
+    public function __construct($value) {
+
+        if ($value !== self::TRANSPARENT && $value !== self::OPAQUE) {
+            throw new \InvalidArgumentException('The value must either be specified as "transparent" or "opaque"');
+        }
+        $this->value = $value;
+
+    }
+
+    /**
+     * Returns the current value
+     *
+     * @return string
+     */
+    public function getValue() {
+
+        return $this->value;
+
+    }
+
+    /**
+     * Serializes the property in a DOMDocument
+     *
+     * @param Sabre_DAV_Server $server
+     * @param DOMElement $node
+     * @return void
+     */
+    public function serialize(Sabre_DAV_Server $server,DOMElement $node) {
+
+        $doc = $node->ownerDocument;
+        switch($this->value) {
+            case self::TRANSPARENT :
+                $xval = $doc->createElement('cal:transparent');
+                break;
+            case self::OPAQUE :
+                $xval = $doc->createElement('cal:opaque');
+                break;
+        }
+
+        $node->appendChild($xval);
+
+    }
+
+    /**
+     * Unserializes the DOMElement back into a Property class.
+     *
+     * @param DOMElement $node
+     * @return Sabre_CalDAV_Property_ScheduleCalendarTransp
+     */
+    static function unserialize(DOMElement $node) {
+
+        $value = null;
+        foreach($node->childNodes as $childNode) {
+            switch(Sabre_DAV_XMLUtil::toClarkNotation($childNode)) {
+                case '{' . Sabre_CalDAV_Plugin::NS_CALDAV . '}opaque' :
+                    $value = self::OPAQUE;
+                    break;
+                case '{' . Sabre_CalDAV_Plugin::NS_CALDAV . '}transparent' :
+                    $value = self::TRANSPARENT;
+                    break;
+            }
+        }
+        if (is_null($value))
+           return null;
+
+        return new self($value);
+
+    }
+}
diff --git a/3rdparty/Sabre/CalDAV/Schedule/IMip.php b/3rdparty/Sabre/CalDAV/Schedule/IMip.php
index 37e75fcc4a7..92c3c097c15 100755
--- a/3rdparty/Sabre/CalDAV/Schedule/IMip.php
+++ b/3rdparty/Sabre/CalDAV/Schedule/IMip.php
@@ -1,5 +1,7 @@
 <?php
 
+use Sabre\VObject;
+
 /**
  * iMIP handler.
  *
@@ -42,12 +44,13 @@ class Sabre_CalDAV_Schedule_IMip {
     /**
      * Sends one or more iTip messages through email.
      *
-     * @param string $originator
-     * @param array $recipients
-     * @param Sabre_VObject_Component $vObject
+     * @param string $originator Originator Email
+     * @param array $recipients Array of email addresses
+     * @param Sabre\VObject\Component $vObject
+     * @param string $principal Principal Url of the originator
      * @return void
      */
-    public function sendMessage($originator, array $recipients, Sabre_VObject_Component $vObject) {
+    public function sendMessage($originator, array $recipients, VObject\Component $vObject, $principal) {
 
         foreach($recipients as $recipient) {
 
@@ -83,6 +86,9 @@ class Sabre_CalDAV_Schedule_IMip {
 
     }
 
+    // @codeCoverageIgnoreStart
+    // This is deemed untestable in a reasonable manner
+
     /**
      * This function is reponsible for sending the actual email.
      *
@@ -94,11 +100,11 @@ class Sabre_CalDAV_Schedule_IMip {
      */
     protected function mail($to, $subject, $body, array $headers) {
 
+
         mail($to, $subject, $body, implode("\r\n", $headers));
 
     }
 
+    // @codeCoverageIgnoreEnd
 
 }
-
-?>
diff --git a/3rdparty/Sabre/CalDAV/Schedule/Outbox.php b/3rdparty/Sabre/CalDAV/Schedule/Outbox.php
index 014c37230d1..462aa527e23 100755
--- a/3rdparty/Sabre/CalDAV/Schedule/Outbox.php
+++ b/3rdparty/Sabre/CalDAV/Schedule/Outbox.php
@@ -13,7 +13,7 @@
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
  */
-class Sabre_CalDAV_Schedule_Outbox extends Sabre_DAV_Directory implements Sabre_CalDAV_Schedule_IOutbox {
+class Sabre_CalDAV_Schedule_Outbox extends Sabre_DAV_Collection implements Sabre_CalDAV_Schedule_IOutbox {
 
     /**
      * The principal Uri
@@ -104,6 +104,11 @@ class Sabre_CalDAV_Schedule_Outbox extends Sabre_DAV_Directory implements Sabre_
                 'protected' => true,
             ),
             array(
+                'privilege' => '{' . Sabre_CalDAV_Plugin::NS_CALDAV . '}schedule-post-vevent',
+                'principal' => $this->getOwner(),
+                'protected' => true,
+            ),
+            array(
                 'privilege' => '{DAV:}read',
                 'principal' => $this->getOwner(),
                 'protected' => true,
@@ -144,6 +149,9 @@ class Sabre_CalDAV_Schedule_Outbox extends Sabre_DAV_Directory implements Sabre_
         $default['aggregates'][] = array(
             'privilege' => '{' . Sabre_CalDAV_Plugin::NS_CALDAV . '}schedule-query-freebusy',
         );
+        $default['aggregates'][] = array(
+            'privilege' => '{' . Sabre_CalDAV_Plugin::NS_CALDAV . '}schedule-post-vevent',
+        );
 
         return $default;
 
diff --git a/3rdparty/Sabre/CalDAV/Server.php b/3rdparty/Sabre/CalDAV/Server.php
deleted file mode 100755
index 325e3d80a7f..00000000000
--- a/3rdparty/Sabre/CalDAV/Server.php
+++ /dev/null
@@ -1,68 +0,0 @@
-<?php
-
-/**
- * CalDAV server
- *
- * Deprecated! Warning: This class is now officially deprecated
- *
- * This script is a convenience script. It quickly sets up a WebDAV server
- * with caldav and ACL support, and it creates the root 'principals' and
- * 'calendars' collections.
- *
- * Note that if you plan to do anything moderately complex, you are advised to
- * not subclass this server, but use Sabre_DAV_Server directly instead. This
- * class is nothing more than an 'easy setup'.
- *
- * @package Sabre
- * @subpackage CalDAV
- * @deprecated Don't use this class anymore, it will be removed in version 1.7.
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/) 
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- */
-class Sabre_CalDAV_Server extends Sabre_DAV_Server {
-
-    /**
-     * The authentication realm
-     *
-     * Note that if this changes, the hashes in the auth backend must also
-     * be recalculated.
-     *
-     * @var string
-     */
-    public $authRealm = 'SabreDAV';
-
-    /**
-     * Sets up the object. A PDO object must be passed to setup all the backends.
-     *
-     * @param PDO $pdo
-     */
-    public function __construct(PDO $pdo) {
-
-        /* Backends */
-        $authBackend = new Sabre_DAV_Auth_Backend_PDO($pdo);
-        $calendarBackend = new Sabre_CalDAV_Backend_PDO($pdo);
-        $principalBackend = new Sabre_DAVACL_PrincipalBackend_PDO($pdo);
-
-        /* Directory structure */
-        $tree = array(
-            new Sabre_CalDAV_Principal_Collection($principalBackend),
-            new Sabre_CalDAV_CalendarRootNode($principalBackend, $calendarBackend),
-        );
-
-        /* Initializing server */
-        parent::__construct($tree);
-
-        /* Server Plugins */
-        $authPlugin = new Sabre_DAV_Auth_Plugin($authBackend,$this->authRealm);
-        $this->addPlugin($authPlugin);
-
-        $aclPlugin = new Sabre_DAVACL_Plugin();
-        $this->addPlugin($aclPlugin);
-
-        $caldavPlugin = new Sabre_CalDAV_Plugin();
-        $this->addPlugin($caldavPlugin);
-
-    }
-
-}
diff --git a/3rdparty/Sabre/CalDAV/ShareableCalendar.php b/3rdparty/Sabre/CalDAV/ShareableCalendar.php
new file mode 100755
index 00000000000..0e44885c621
--- /dev/null
+++ b/3rdparty/Sabre/CalDAV/ShareableCalendar.php
@@ -0,0 +1,72 @@
+<?php
+
+/**
+ * This object represents a CalDAV calendar that can be shared with other
+ * users.
+ *
+ * @package Sabre
+ * @subpackage CalDAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+class Sabre_CalDAV_ShareableCalendar extends Sabre_CalDAV_Calendar implements Sabre_CalDAV_IShareableCalendar {
+
+    /**
+     * Updates the list of shares.
+     *
+     * The first array is a list of people that are to be added to the
+     * calendar.
+     *
+     * Every element in the add array has the following properties:
+     *   * href - A url. Usually a mailto: address
+     *   * commonName - Usually a first and last name, or false
+     *   * summary - A description of the share, can also be false
+     *   * readOnly - A boolean value
+     *
+     * Every element in the remove array is just the address string.
+     *
+     * @param array $add
+     * @param array $remove
+     * @return void
+     */
+    public function updateShares(array $add, array $remove) {
+
+        $this->caldavBackend->updateShares($this->calendarInfo['id'], $add, $remove);
+
+    }
+
+    /**
+     * Returns the list of people whom this calendar is shared with.
+     *
+     * Every element in this array should have the following properties:
+     *   * href - Often a mailto: address
+     *   * commonName - Optional, for example a first + last name
+     *   * status - See the Sabre_CalDAV_SharingPlugin::STATUS_ constants.
+     *   * readOnly - boolean
+     *   * summary - Optional, a description for the share
+     *
+     * @return array
+     */
+    public function getShares() {
+
+        return $this->caldavBackend->getShares($this->calendarInfo['id']);
+
+    }
+
+    /**
+     * Marks this calendar as published.
+     *
+     * Publishing a calendar should automatically create a read-only, public,
+     * subscribable calendar.
+     *
+     * @param bool $value
+     * @return void
+     */
+    public function setPublishStatus($value) {
+
+        $this->caldavBackend->setPublishStatus($this->calendarInfo['id'], $value);
+
+    }
+
+}
diff --git a/3rdparty/Sabre/CalDAV/SharedCalendar.php b/3rdparty/Sabre/CalDAV/SharedCalendar.php
new file mode 100755
index 00000000000..9000697d3ec
--- /dev/null
+++ b/3rdparty/Sabre/CalDAV/SharedCalendar.php
@@ -0,0 +1,98 @@
+<?php
+
+/**
+ * This object represents a CalDAV calendar that is shared by a different user.
+ *
+ * @package Sabre
+ * @subpackage CalDAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+class Sabre_CalDAV_SharedCalendar extends Sabre_CalDAV_Calendar implements Sabre_CalDAV_ISharedCalendar {
+
+    /**
+     * Constructor
+     *
+     * @param Sabre_DAVACL_IPrincipalBackend $principalBackend
+     * @param Sabre_CalDAV_Backend_BackendInterface $caldavBackend
+     * @param array $calendarInfo
+     */
+    public function __construct(Sabre_DAVACL_IPrincipalBackend $principalBackend, Sabre_CalDAV_Backend_BackendInterface $caldavBackend, $calendarInfo) {
+
+        $required = array(
+            '{http://calendarserver.org/ns/}shared-url',
+            '{http://sabredav.org/ns}owner-principal',
+            '{http://sabredav.org/ns}read-only',
+        );
+        foreach($required as $r) {
+            if (!isset($calendarInfo[$r])) {
+                throw new InvalidArgumentException('The ' . $r . ' property must be specified for SharedCalendar(s)');
+            }
+        }
+
+        parent::__construct($principalBackend, $caldavBackend, $calendarInfo);
+
+    }
+
+    /**
+     * This method should return the url of the owners' copy of the shared
+     * calendar.
+     *
+     * @return string
+     */
+    public function getSharedUrl() {
+
+        return $this->calendarInfo['{http://calendarserver.org/ns/}shared-url'];
+
+    }
+
+    /**
+     * Returns the owner principal
+     *
+     * This must be a url to a principal, or null if there's no owner
+     *
+     * @return string|null
+     */
+    public function getOwner() {
+
+        return $this->calendarInfo['{http://sabredav.org/ns}owner-principal'];
+
+    }
+
+    /**
+     * Returns a list of ACE's for this node.
+     *
+     * Each ACE has the following properties:
+     *   * 'privilege', a string such as {DAV:}read or {DAV:}write. These are
+     *     currently the only supported privileges
+     *   * 'principal', a url to the principal who owns the node
+     *   * 'protected' (optional), indicating that this ACE is not allowed to
+     *      be updated.
+     *
+     * @return array
+     */
+    public function getACL() {
+
+        // The top-level ACL only contains access information for the true
+        // owner of the calendar, so we need to add the information for the
+        // sharee.
+        $acl = parent::getACL();
+        $acl[] = array(
+            'privilege' => '{DAV:}read',
+            'principal' => $this->calendarInfo['principaluri'],
+            'protected' => true,
+        );
+        if (!$this->calendarInfo['{http://sabredav.org/ns}read-only']) {
+            $acl[] = array(
+                'privilege' => '{DAV:}write',
+                'principal' => $this->calendarInfo['principaluri'],
+                'protected' => true,
+            );
+        }
+        return $acl;
+
+    }
+
+
+}
diff --git a/3rdparty/Sabre/CalDAV/SharingPlugin.php b/3rdparty/Sabre/CalDAV/SharingPlugin.php
new file mode 100755
index 00000000000..31df8057b24
--- /dev/null
+++ b/3rdparty/Sabre/CalDAV/SharingPlugin.php
@@ -0,0 +1,475 @@
+<?php
+
+/**
+ * This plugin implements support for caldav sharing.
+ *
+ * This spec is defined at:
+ * http://svn.calendarserver.org/repository/calendarserver/CalendarServer/trunk/doc/Extensions/caldav-sharing.txt
+ *
+ * See:
+ * Sabre_CalDAV_Backend_SharingSupport for all the documentation.
+ *
+ * Note: This feature is experimental, and may change in between different
+ * SabreDAV versions.
+ *
+ * @package Sabre
+ * @subpackage CalDAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+class Sabre_CalDAV_SharingPlugin extends Sabre_DAV_ServerPlugin {
+
+    /**
+     * These are the various status constants used by sharing-messages.
+     */
+    const STATUS_ACCEPTED = 1;
+    const STATUS_DECLINED = 2;
+    const STATUS_DELETED = 3;
+    const STATUS_NORESPONSE = 4;
+    const STATUS_INVALID = 5;
+
+    /**
+     * Reference to SabreDAV server object.
+     *
+     * @var Sabre_DAV_Server
+     */
+    protected $server;
+
+    /**
+     * This method should return a list of server-features.
+     *
+     * This is for example 'versioning' and is added to the DAV: header
+     * in an OPTIONS response.
+     *
+     * @return array
+     */
+    public function getFeatures() {
+
+        return array('calendarserver-sharing');
+
+    }
+
+    /**
+     * Returns a plugin name.
+     *
+     * Using this name other plugins will be able to access other plugins
+     * using Sabre_DAV_Server::getPlugin
+     *
+     * @return string
+     */
+    public function getPluginName() {
+
+        return 'caldav-sharing';
+
+    }
+
+    /**
+     * This initializes the plugin.
+     *
+     * This function is called by Sabre_DAV_Server, after
+     * addPlugin is called.
+     *
+     * This method should set up the required event subscriptions.
+     *
+     * @param Sabre_DAV_Server $server
+     * @return void
+     */
+    public function initialize(Sabre_DAV_Server $server) {
+
+        $this->server = $server;
+        //$server->resourceTypeMapping['Sabre_CalDAV_IShareableCalendar'] = '{' . Sabre_CalDAV_Plugin::NS_CALENDARSERVER . '}shared-owner';
+        $server->resourceTypeMapping['Sabre_CalDAV_ISharedCalendar'] = '{' . Sabre_CalDAV_Plugin::NS_CALENDARSERVER . '}shared';
+
+        array_push(
+            $this->server->protectedProperties,
+            '{' . Sabre_CalDAV_Plugin::NS_CALENDARSERVER . '}invite',
+            '{' . Sabre_CalDAV_Plugin::NS_CALENDARSERVER . '}allowed-sharing-modes',
+            '{' . Sabre_CalDAV_Plugin::NS_CALENDARSERVER . '}shared-url'
+        );
+
+        $this->server->subscribeEvent('beforeGetProperties', array($this, 'beforeGetProperties'));
+        $this->server->subscribeEvent('afterGetProperties', array($this, 'afterGetProperties'));
+        $this->server->subscribeEvent('updateProperties', array($this, 'updateProperties'));
+        $this->server->subscribeEvent('unknownMethod', array($this,'unknownMethod'));
+
+    }
+
+    /**
+     * This event is triggered when properties are requested for a certain
+     * node.
+     *
+     * This allows us to inject any properties early.
+     *
+     * @param string $path
+     * @param Sabre_DAV_INode $node
+     * @param array $requestedProperties
+     * @param array $returnedProperties
+     * @return void
+     */
+    public function beforeGetProperties($path, Sabre_DAV_INode $node, &$requestedProperties, &$returnedProperties) {
+
+        if ($node instanceof Sabre_CalDAV_IShareableCalendar) {
+            if (($index = array_search('{' . Sabre_CalDAV_Plugin::NS_CALENDARSERVER . '}invite', $requestedProperties))!==false) {
+
+                unset($requestedProperties[$index]);
+                $returnedProperties[200]['{' . Sabre_CalDAV_Plugin::NS_CALENDARSERVER . '}invite'] =
+                    new Sabre_CalDAV_Property_Invite(
+                        $node->getShares()
+                    );
+
+            }
+
+        }
+        if ($node instanceof Sabre_CalDAV_ISharedCalendar) {
+            if (($index = array_search('{' . Sabre_CalDAV_Plugin::NS_CALENDARSERVER . '}shared-url', $requestedProperties))!==false) {
+
+                unset($requestedProperties[$index]);
+                $returnedProperties[200]['{' . Sabre_CalDAV_Plugin::NS_CALENDARSERVER . '}shared-url'] =
+                    new Sabre_DAV_Property_Href(
+                        $node->getSharedUrl()
+                    );
+
+            }
+
+        }
+
+    }
+
+    /**
+     * This method is triggered *after* all properties have been retrieved.
+     * This allows us to inject the correct resourcetype for calendars that
+     * have been shared.
+     *
+     * @param string $path
+     * @param array $properties
+     * @param Sabre_DAV_INode $node
+     * @return void
+     */
+    public function afterGetProperties($path, &$properties, Sabre_DAV_INode $node) {
+
+        if ($node instanceof Sabre_CalDAV_IShareableCalendar) {
+            if (isset($properties[200]['{DAV:}resourcetype'])) {
+                if (count($node->getShares())>0) {
+                    $properties[200]['{DAV:}resourcetype']->add(
+                        '{' . Sabre_CalDAV_Plugin::NS_CALENDARSERVER . '}shared-owner'
+                    );
+                }
+            }
+            $propName = '{' . Sabre_CalDAV_Plugin::NS_CALENDARSERVER . '}allowed-sharing-modes';
+            if (array_key_exists($propName, $properties[404])) {
+                unset($properties[404][$propName]);
+                $properties[200][$propName] = new Sabre_CalDAV_Property_AllowedSharingModes(true,false);
+            }
+
+        }
+
+    }
+
+    /**
+     * This method is trigged when a user attempts to update a node's
+     * properties.
+     *
+     * A previous draft of the sharing spec stated that it was possible to use
+     * PROPPATCH to remove 'shared-owner' from the resourcetype, thus unsharing
+     * the calendar.
+     *
+     * Even though this is no longer in the current spec, we keep this around
+     * because OS X 10.7 may still make use of this feature.
+     *
+     * @param array $mutations
+     * @param array $result
+     * @param Sabre_DAV_INode $node
+     * @return void
+     */
+    public function updateProperties(array &$mutations, array &$result, Sabre_DAV_INode $node) {
+
+        if (!$node instanceof Sabre_CalDAV_IShareableCalendar)
+            return;
+
+        if (!isset($mutations['{DAV:}resourcetype'])) {
+            return;
+        }
+
+        // Only doing something if shared-owner is indeed not in the list.
+        if($mutations['{DAV:}resourcetype']->is('{' . Sabre_CalDAV_Plugin::NS_CALENDARSERVER . '}shared-owner')) return; 
+
+        $shares = $node->getShares();
+        $remove = array();
+        foreach($shares as $share) {
+            $remove[] = $share['href'];
+        }
+        $node->updateShares(array(), $remove);
+
+        // We're marking this update as 200 OK
+        $result[200]['{DAV:}resourcetype'] = null;
+
+        // Removing it from the mutations list
+        unset($mutations['{DAV:}resourcetype']);
+
+    }
+
+    /**
+     * This event is triggered when the server didn't know how to handle a
+     * certain request.
+     *
+     * We intercept this to handle POST requests on calendars.
+     *
+     * @param string $method
+     * @param string $uri
+     * @return null|bool
+     */
+    public function unknownMethod($method, $uri) {
+
+        if ($method!=='POST') {
+            return;
+        }
+
+        // Only handling xml
+        $contentType = $this->server->httpRequest->getHeader('Content-Type');
+        if (strpos($contentType,'application/xml')===false && strpos($contentType,'text/xml')===false)
+            return;
+
+        // Making sure the node exists
+        try {
+            $node = $this->server->tree->getNodeForPath($uri);
+        } catch (Sabre_DAV_Exception_NotFound $e) {
+            return;
+        }
+
+
+        $dom = Sabre_DAV_XMLUtil::loadDOMDocument($this->server->httpRequest->getBody(true));
+
+        $documentType = Sabre_DAV_XMLUtil::toClarkNotation($dom->firstChild);
+
+        switch($documentType) {
+
+            // Dealing with the 'share' document, which modified invitees on a
+            // calendar.
+            case '{' . Sabre_CalDAV_Plugin::NS_CALENDARSERVER . '}share' :
+
+                // We can only deal with IShareableCalendar objects
+                if (!$node instanceof Sabre_CalDAV_IShareableCalendar) {
+                    return;
+                }
+
+                // Getting ACL info
+                $acl = $this->server->getPlugin('acl');
+
+                // If there's no ACL support, we allow everything
+                if ($acl) {
+                    $acl->checkPrivileges($uri, '{DAV:}write');
+                }
+
+                $mutations = $this->parseShareRequest($dom);
+
+                $node->updateShares($mutations[0], $mutations[1]);
+
+                $this->server->httpResponse->sendStatus(200);
+                // Adding this because sending a response body may cause issues,
+                // and I wanted some type of indicator the response was handled.
+                $this->server->httpResponse->setHeader('X-Sabre-Status', 'everything-went-well');
+
+                // Breaking the event chain
+                return false;
+
+            // The invite-reply document is sent when the user replies to an
+            // invitation of a calendar share.
+            case '{'. Sabre_CalDAV_Plugin::NS_CALENDARSERVER.'}invite-reply' :
+
+                // This only works on the calendar-home-root node.
+                if (!$node instanceof Sabre_CalDAV_UserCalendars) {
+                    return;
+                }
+
+                // Getting ACL info
+                $acl = $this->server->getPlugin('acl');
+
+                // If there's no ACL support, we allow everything
+                if ($acl) {
+                    $acl->checkPrivileges($uri, '{DAV:}write');
+                }
+
+                $message = $this->parseInviteReplyRequest($dom);
+
+                $url = $node->shareReply(
+                    $message['href'],
+                    $message['status'],
+                    $message['calendarUri'],
+                    $message['inReplyTo'],
+                    $message['summary']
+                );
+
+                $this->server->httpResponse->sendStatus(200);
+                // Adding this because sending a response body may cause issues,
+                // and I wanted some type of indicator the response was handled.
+                $this->server->httpResponse->setHeader('X-Sabre-Status', 'everything-went-well');
+
+                if ($url) {
+                    $dom = new DOMDocument('1.0', 'UTF-8');
+                    $dom->formatOutput = true;
+
+                    $root = $dom->createElement('cs:shared-as');
+                    foreach($this->server->xmlNamespaces as $namespace => $prefix) {
+                        $root->setAttribute('xmlns:' . $prefix, $namespace);
+                    }
+
+                    $dom->appendChild($root);
+                    $href = new Sabre_DAV_Property_Href($url);
+
+                    $href->serialize($this->server, $root);
+                    $this->server->httpResponse->setHeader('Content-Type','application/xml');
+                    $this->server->httpResponse->sendBody($dom->saveXML());
+
+                }
+
+                // Breaking the event chain
+                return false;
+
+            case '{' . Sabre_CalDAV_Plugin::NS_CALENDARSERVER . '}publish-calendar' :
+
+                // We can only deal with IShareableCalendar objects
+                if (!$node instanceof Sabre_CalDAV_IShareableCalendar) {
+                    return;
+                }
+
+                // Getting ACL info
+                $acl = $this->server->getPlugin('acl');
+
+                // If there's no ACL support, we allow everything
+                if ($acl) {
+                    $acl->checkPrivileges($uri, '{DAV:}write');
+                }
+
+                $node->setPublishStatus(true);
+
+                // iCloud sends back the 202, so we will too.
+                $this->server->httpResponse->sendStatus(202);
+
+                // Adding this because sending a response body may cause issues,
+                // and I wanted some type of indicator the response was handled.
+                $this->server->httpResponse->setHeader('X-Sabre-Status', 'everything-went-well');
+
+                // Breaking the event chain
+                return false;
+
+            case '{' . Sabre_CalDAV_Plugin::NS_CALENDARSERVER . '}unpublish-calendar' :
+
+                // We can only deal with IShareableCalendar objects
+                if (!$node instanceof Sabre_CalDAV_IShareableCalendar) {
+                    return;
+                }
+
+                // Getting ACL info
+                $acl = $this->server->getPlugin('acl');
+
+                // If there's no ACL support, we allow everything
+                if ($acl) {
+                    $acl->checkPrivileges($uri, '{DAV:}write');
+                }
+
+                $node->setPublishStatus(false);
+
+                $this->server->httpResponse->sendStatus(200);
+
+                // Adding this because sending a response body may cause issues,
+                // and I wanted some type of indicator the response was handled.
+                $this->server->httpResponse->setHeader('X-Sabre-Status', 'everything-went-well');
+
+                // Breaking the event chain
+                return false;
+
+        }
+
+
+    }
+
+    /**
+     * Parses the 'share' POST request.
+     *
+     * This method returns an array, containing two arrays.
+     * The first array is a list of new sharees. Every element is a struct
+     * containing a:
+     *   * href element. (usually a mailto: address)
+     *   * commonName element (often a first and lastname, but can also be
+     *     false)
+     *   * readOnly (true or false)
+     *   * summary (A description of the share, can also be false)
+     *
+     * The second array is a list of sharees that are to be removed. This is
+     * just a simple array with 'hrefs'.
+     *
+     * @param DOMDocument $dom
+     * @return array
+     */
+    protected function parseShareRequest(DOMDocument $dom) {
+
+        $xpath = new \DOMXPath($dom);
+        $xpath->registerNamespace('cs', Sabre_CalDAV_Plugin::NS_CALENDARSERVER);
+        $xpath->registerNamespace('d', 'DAV:');
+
+
+        $set = array();
+        $elems = $xpath->query('cs:set');
+
+        for($i=0; $i < $elems->length; $i++) {
+
+            $xset = $elems->item($i);
+            $set[] = array(
+                'href' => $xpath->evaluate('string(d:href)', $xset),
+                'commonName' => $xpath->evaluate('string(cs:common-name)', $xset),
+                'summary' => $xpath->evaluate('string(cs:summary)', $xset),
+                'readOnly' => $xpath->evaluate('boolean(cs:read)', $xset)!==false
+            );
+
+        }
+
+        $remove = array();
+        $elems = $xpath->query('cs:remove');
+
+        for($i=0; $i < $elems->length; $i++) {
+
+            $xremove = $elems->item($i);
+            $remove[] = $xpath->evaluate('string(d:href)', $xremove);
+
+        }
+
+        return array($set, $remove);
+
+    }
+
+    /**
+     * Parses the 'invite-reply' POST request.
+     *
+     * This method returns an array, containing the following properties:
+     *   * href - The sharee who is replying
+     *   * status - One of the self::STATUS_* constants
+     *   * calendarUri - The url of the shared calendar
+     *   * inReplyTo - The unique id of the share invitation.
+     *   * summary - Optional description of the reply.
+     *
+     * @param DOMDocument $dom
+     * @return array
+     */
+    protected function parseInviteReplyRequest(DOMDocument $dom) {
+
+        $xpath = new \DOMXPath($dom);
+        $xpath->registerNamespace('cs', Sabre_CalDAV_Plugin::NS_CALENDARSERVER);
+        $xpath->registerNamespace('d', 'DAV:');
+
+        $hostHref = $xpath->evaluate('string(cs:hosturl/d:href)');
+        if (!$hostHref) {
+            throw new Sabre_DAV_Exception_BadRequest('The {' . Sabre_CalDAV_Plugin::NS_CALENDARSERVER . '}hosturl/{DAV:}href element is required');
+        }
+
+        return array(
+            'href' => $xpath->evaluate('string(d:href)'),
+            'calendarUri' => $this->server->calculateUri($hostHref),
+            'inReplyTo' => $xpath->evaluate('string(cs:in-reply-to)'),
+            'summary' => $xpath->evaluate('string(cs:summary)'),
+            'status' => $xpath->evaluate('boolean(cs:invite-accepted)')?self::STATUS_ACCEPTED:self::STATUS_DECLINED
+        );
+
+    }
+
+}
diff --git a/3rdparty/Sabre/CalDAV/UserCalendars.php b/3rdparty/Sabre/CalDAV/UserCalendars.php
index b8d3f0573fa..3194e6677ab 100755
--- a/3rdparty/Sabre/CalDAV/UserCalendars.php
+++ b/3rdparty/Sabre/CalDAV/UserCalendars.php
@@ -6,7 +6,7 @@
  * @package Sabre
  * @subpackage CalDAV
  * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/) 
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
  */
 class Sabre_CalDAV_UserCalendars implements Sabre_DAV_IExtendedCollection, Sabre_DAVACL_IACL {
@@ -21,7 +21,7 @@ class Sabre_CalDAV_UserCalendars implements Sabre_DAV_IExtendedCollection, Sabre
     /**
      * CalDAV backend
      *
-     * @var Sabre_CalDAV_Backend_Abstract
+     * @var Sabre_CalDAV_Backend_BackendInterface
      */
     protected $caldavBackend;
 
@@ -36,10 +36,10 @@ class Sabre_CalDAV_UserCalendars implements Sabre_DAV_IExtendedCollection, Sabre
      * Constructor
      *
      * @param Sabre_DAVACL_IPrincipalBackend $principalBackend
-     * @param Sabre_CalDAV_Backend_Abstract $caldavBackend
+     * @param Sabre_CalDAV_Backend_BackendInterface $caldavBackend
      * @param mixed $userUri
      */
-    public function __construct(Sabre_DAVACL_IPrincipalBackend $principalBackend, Sabre_CalDAV_Backend_Abstract $caldavBackend, $userUri) {
+    public function __construct(Sabre_DAVACL_IPrincipalBackend $principalBackend, Sabre_CalDAV_Backend_BackendInterface $caldavBackend, $userUri) {
 
         $this->principalBackend = $principalBackend;
         $this->caldavBackend = $caldavBackend;
@@ -168,9 +168,22 @@ class Sabre_CalDAV_UserCalendars implements Sabre_DAV_IExtendedCollection, Sabre
         $calendars = $this->caldavBackend->getCalendarsForUser($this->principalInfo['uri']);
         $objs = array();
         foreach($calendars as $calendar) {
-            $objs[] = new Sabre_CalDAV_Calendar($this->principalBackend, $this->caldavBackend, $calendar);
+            if ($this->caldavBackend instanceof Sabre_CalDAV_Backend_SharingSupport) {
+                if (isset($calendar['{http://calendarserver.org/ns/}shared-url'])) {
+                    $objs[] = new Sabre_CalDAV_SharedCalendar($this->principalBackend, $this->caldavBackend, $calendar);
+                } else {
+                    $objs[] = new Sabre_CalDAV_ShareableCalendar($this->principalBackend, $this->caldavBackend, $calendar);
+                }
+            } else {
+                $objs[] = new Sabre_CalDAV_Calendar($this->principalBackend, $this->caldavBackend, $calendar);
+            }
         }
         $objs[] = new Sabre_CalDAV_Schedule_Outbox($this->principalInfo['uri']);
+
+        // We're adding a notifications node, if it's supported by the backend.
+        if ($this->caldavBackend instanceof Sabre_CalDAV_Backend_NotificationSupport) {
+            $objs[] = new Sabre_CalDAV_Notifications_Collection($this->caldavBackend, $this->principalInfo['uri']);
+        }
         return $objs;
 
     }
@@ -185,8 +198,22 @@ class Sabre_CalDAV_UserCalendars implements Sabre_DAV_IExtendedCollection, Sabre
      */
     public function createExtendedCollection($name, array $resourceType, array $properties) {
 
-        if (!in_array('{urn:ietf:params:xml:ns:caldav}calendar',$resourceType) || count($resourceType)!==2) {
-            throw new Sabre_DAV_Exception_InvalidResourceType('Unknown resourceType for this collection');
+        $isCalendar = false;
+        foreach($resourceType as $rt) {
+            switch ($rt) {
+                case '{DAV:}collection' :
+                case '{http://calendarserver.org/ns/}shared-owner' :
+                    // ignore
+                    break;
+                case '{urn:ietf:params:xml:ns:caldav}calendar' :
+                    $isCalendar = true;
+                    break;
+                default :
+                    throw new Sabre_DAV_Exception_InvalidResourceType('Unknown resourceType: ' . $rt);
+            }
+        }
+        if (!$isCalendar) {
+            throw new Sabre_DAV_Exception_InvalidResourceType('You can only create calendars in this collection');
         }
         $this->caldavBackend->createCalendar($this->principalInfo['uri'], $name, $properties);
 
@@ -295,4 +322,27 @@ class Sabre_CalDAV_UserCalendars implements Sabre_DAV_IExtendedCollection, Sabre
 
     }
 
+    /**
+     * This method is called when a user replied to a request to share.
+     *
+     * This method should return the url of the newly created calendar if the
+     * share was accepted.
+     *
+     * @param string href The sharee who is replying (often a mailto: address)
+     * @param int status One of the SharingPlugin::STATUS_* constants
+     * @param string $calendarUri The url to the calendar thats being shared
+     * @param string $inReplyTo The unique id this message is a response to
+     * @param string $summary A description of the reply
+     * @return null|string
+     */
+    public function shareReply($href, $status, $calendarUri, $inReplyTo, $summary = null) {
+
+        if (!$this->caldavBackend instanceof Sabre_CalDAV_Backend_SharingSupport) {
+            throw new Sabre_DAV_Exception_NotImplemented('Sharing support is not implemented by this backend.');
+        }
+
+        return $this->caldavBackend->shareReply($href, $status, $calendarUri, $inReplyTo, $summary);
+
+    }
+
 }
diff --git a/3rdparty/Sabre/CalDAV/Version.php b/3rdparty/Sabre/CalDAV/Version.php
index ace9901c089..0ad14fa0869 100755
--- a/3rdparty/Sabre/CalDAV/Version.php
+++ b/3rdparty/Sabre/CalDAV/Version.php
@@ -14,7 +14,7 @@ class Sabre_CalDAV_Version {
     /**
      * Full version number
      */
-    const VERSION = '1.6.4';
+    const VERSION = '1.7.0';
 
     /**
      * Stability : alpha, beta, stable
diff --git a/3rdparty/Sabre/CalDAV/includes.php b/3rdparty/Sabre/CalDAV/includes.php
index 1ecb870a0e1..8b38e398f65 100755
--- a/3rdparty/Sabre/CalDAV/includes.php
+++ b/3rdparty/Sabre/CalDAV/includes.php
@@ -16,28 +16,47 @@
  */
 
 // Begin includes
-include __DIR__ . '/Backend/Abstract.php';
-include __DIR__ . '/Backend/PDO.php';
+include __DIR__ . '/Backend/BackendInterface.php';
+include __DIR__ . '/Backend/NotificationSupport.php';
+include __DIR__ . '/Backend/SharingSupport.php';
 include __DIR__ . '/CalendarQueryParser.php';
 include __DIR__ . '/CalendarQueryValidator.php';
 include __DIR__ . '/CalendarRootNode.php';
+include __DIR__ . '/Exception/InvalidComponentType.php';
 include __DIR__ . '/ICalendar.php';
 include __DIR__ . '/ICalendarObject.php';
 include __DIR__ . '/ICSExportPlugin.php';
+include __DIR__ . '/IShareableCalendar.php';
+include __DIR__ . '/ISharedCalendar.php';
+include __DIR__ . '/Notifications/ICollection.php';
+include __DIR__ . '/Notifications/INode.php';
+include __DIR__ . '/Notifications/INotificationType.php';
+include __DIR__ . '/Notifications/Node.php';
+include __DIR__ . '/Notifications/Notification/Invite.php';
+include __DIR__ . '/Notifications/Notification/InviteReply.php';
+include __DIR__ . '/Notifications/Notification/SystemStatus.php';
 include __DIR__ . '/Plugin.php';
 include __DIR__ . '/Principal/Collection.php';
 include __DIR__ . '/Principal/ProxyRead.php';
 include __DIR__ . '/Principal/ProxyWrite.php';
 include __DIR__ . '/Principal/User.php';
+include __DIR__ . '/Property/AllowedSharingModes.php';
+include __DIR__ . '/Property/Invite.php';
+include __DIR__ . '/Property/ScheduleCalendarTransp.php';
 include __DIR__ . '/Property/SupportedCalendarComponentSet.php';
 include __DIR__ . '/Property/SupportedCalendarData.php';
 include __DIR__ . '/Property/SupportedCollationSet.php';
 include __DIR__ . '/Schedule/IMip.php';
 include __DIR__ . '/Schedule/IOutbox.php';
 include __DIR__ . '/Schedule/Outbox.php';
-include __DIR__ . '/Server.php';
+include __DIR__ . '/SharingPlugin.php';
 include __DIR__ . '/UserCalendars.php';
 include __DIR__ . '/Version.php';
+include __DIR__ . '/Backend/Abstract.php';
+include __DIR__ . '/Backend/PDO.php';
 include __DIR__ . '/Calendar.php';
 include __DIR__ . '/CalendarObject.php';
+include __DIR__ . '/Notifications/Collection.php';
+include __DIR__ . '/ShareableCalendar.php';
+include __DIR__ . '/SharedCalendar.php';
 // End includes
diff --git a/3rdparty/Sabre/CardDAV/AddressBook.php b/3rdparty/Sabre/CardDAV/AddressBook.php
index 12297175a85..8d545114d97 100755
--- a/3rdparty/Sabre/CardDAV/AddressBook.php
+++ b/3rdparty/Sabre/CardDAV/AddressBook.php
@@ -55,7 +55,7 @@ class Sabre_CardDAV_AddressBook extends Sabre_DAV_Collection implements Sabre_Ca
      * Returns a card
      *
      * @param string $name
-     * @return Sabre_DAV_Card
+     * @return Sabre_CardDAV_ICard
      */
     public function getChild($name) {
 
@@ -104,7 +104,7 @@ class Sabre_CardDAV_AddressBook extends Sabre_DAV_Collection implements Sabre_Ca
      *
      * @param string $name
      * @param resource $vcardData
-     * @return void|null
+     * @return string|null
      */
     public function createFile($name,$vcardData = null) {
 
diff --git a/3rdparty/Sabre/CardDAV/Card.php b/3rdparty/Sabre/CardDAV/Card.php
index d7c66333837..0e35d321eb8 100755
--- a/3rdparty/Sabre/CardDAV/Card.php
+++ b/3rdparty/Sabre/CardDAV/Card.php
@@ -6,7 +6,7 @@
  * @package Sabre
  * @subpackage CardDAV
  * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/) 
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
  */
 class Sabre_CardDAV_Card extends Sabre_DAV_File implements Sabre_CardDAV_ICard, Sabre_DAVACL_IACL {
@@ -78,7 +78,7 @@ class Sabre_CardDAV_Card extends Sabre_DAV_File implements Sabre_CardDAV_ICard,
      * Updates the VCard-formatted object
      *
      * @param string $cardData
-     * @return void
+     * @return string|null
      */
     public function put($cardData) {
 
@@ -114,7 +114,7 @@ class Sabre_CardDAV_Card extends Sabre_DAV_File implements Sabre_CardDAV_ICard,
      */
     public function getContentType() {
 
-        return 'text/x-vcard';
+        return 'text/x-vcard; charset=utf-8';
 
     }
 
@@ -128,7 +128,13 @@ class Sabre_CardDAV_Card extends Sabre_DAV_File implements Sabre_CardDAV_ICard,
         if (isset($this->cardData['etag'])) {
             return $this->cardData['etag'];
         } else {
-            return '"' . md5($this->get()) . '"';
+            $data = $this->get();
+            if (is_string($data)) {
+                return '"' . md5($data) . '"';
+            } else {
+                // We refuse to calculate the md5 if it's a stream.
+                return null;
+            }
         }
 
     }
@@ -136,7 +142,7 @@ class Sabre_CardDAV_Card extends Sabre_DAV_File implements Sabre_CardDAV_ICard,
     /**
      * Returns the last modification date as a unix timestamp
      *
-     * @return time
+     * @return int
      */
     public function getLastModified() {
 
diff --git a/3rdparty/Sabre/CardDAV/Plugin.php b/3rdparty/Sabre/CardDAV/Plugin.php
index 96def6dd96b..12bccaec4fb 100755
--- a/3rdparty/Sabre/CardDAV/Plugin.php
+++ b/3rdparty/Sabre/CardDAV/Plugin.php
@@ -1,5 +1,7 @@
 <?php
 
+use Sabre\VObject;
+
 /**
  * CardDAV plugin
  *
@@ -48,6 +50,7 @@ class Sabre_CardDAV_Plugin extends Sabre_DAV_ServerPlugin {
 
         /* Events */
         $server->subscribeEvent('beforeGetProperties', array($this, 'beforeGetProperties'));
+        $server->subscribeEvent('afterGetProperties',  array($this, 'afterGetProperties'));
         $server->subscribeEvent('updateProperties', array($this, 'updateProperties'));
         $server->subscribeEvent('report', array($this,'report'));
         $server->subscribeEvent('onHTMLActionsPanel', array($this,'htmlActionsPanel'));
@@ -153,10 +156,6 @@ class Sabre_CardDAV_Plugin extends Sabre_DAV_ServerPlugin {
                 if (is_resource($val))
                     $val = stream_get_contents($val);
 
-                // Taking out \r to not screw up the xml output
-                //$returnedProperties[200][$addressDataProp] = str_replace("\r","", $val);
-                // The stripping of \r breaks the Mail App in OSX Mountain Lion
-                // this is fixed in master, but not backported. /Tanghus
                 $returnedProperties[200][$addressDataProp] = $val;
 
             }
@@ -190,7 +189,7 @@ class Sabre_CardDAV_Plugin extends Sabre_DAV_ServerPlugin {
      * @param array $mutations
      * @param array $result
      * @param Sabre_DAV_INode $node
-     * @return void
+     * @return bool
      */
     public function updateProperties(&$mutations, &$result, $node) {
 
@@ -272,7 +271,7 @@ class Sabre_CardDAV_Plugin extends Sabre_DAV_ServerPlugin {
 
         $properties = array_keys(Sabre_DAV_XMLUtil::parseProperties($dom->firstChild));
 
-        $hrefElems = $dom->getElementsByTagNameNS('urn:DAV','href');
+        $hrefElems = $dom->getElementsByTagNameNS('DAV:','href');
         $propertyList = array();
 
         foreach($hrefElems as $elem) {
@@ -282,9 +281,12 @@ class Sabre_CardDAV_Plugin extends Sabre_DAV_ServerPlugin {
 
         }
 
+        $prefer = $this->server->getHTTPPRefer();
+
         $this->server->httpResponse->sendStatus(207);
         $this->server->httpResponse->setHeader('Content-Type','application/xml; charset=utf-8');
-        $this->server->httpResponse->sendBody($this->server->generateMultiStatus($propertyList));
+        $this->server->httpResponse->setHeader('Vary','Brief,Prefer');
+        $this->server->httpResponse->sendBody($this->server->generateMultiStatus($propertyList, $prefer['return-minimal']));
 
     }
 
@@ -348,9 +350,9 @@ class Sabre_CardDAV_Plugin extends Sabre_DAV_ServerPlugin {
 
         try {
 
-            $vobj = Sabre_VObject_Reader::read($data);
+            $vobj = VObject\Reader::read($data);
 
-        } catch (Sabre_VObject_ParseException $e) {
+        } catch (VObject\ParseException $e) {
 
             throw new Sabre_DAV_Exception_UnsupportedMediaType('This resource only supports valid vcard data. Parse error: ' . $e->getMessage());
 
@@ -360,6 +362,10 @@ class Sabre_CardDAV_Plugin extends Sabre_DAV_ServerPlugin {
             throw new Sabre_DAV_Exception_UnsupportedMediaType('This collection can only support vcard objects.');
         }
 
+        if (!isset($vobj->UID)) {
+            throw new Sabre_DAV_Exception_BadRequest('Every vcard must have an UID.');
+        }
+
     }
 
 
@@ -424,9 +430,12 @@ class Sabre_CardDAV_Plugin extends Sabre_DAV_ServerPlugin {
 
         }
 
+        $prefer = $this->server->getHTTPPRefer();
+
         $this->server->httpResponse->sendStatus(207);
         $this->server->httpResponse->setHeader('Content-Type','application/xml; charset=utf-8');
-        $this->server->httpResponse->sendBody($this->server->generateMultiStatus($result));
+        $this->server->httpResponse->setHeader('Vary','Brief,Prefer');
+        $this->server->httpResponse->sendBody($this->server->generateMultiStatus($result, $prefer['return-minimal']));
 
     }
 
@@ -440,7 +449,7 @@ class Sabre_CardDAV_Plugin extends Sabre_DAV_ServerPlugin {
      */
     public function validateFilters($vcardData, array $filters, $test) {
 
-        $vcard = Sabre_VObject_Reader::read($vcardData);
+        $vcard = VObject\Reader::read($vcardData);
 
         if (!$filters) return true;
 
@@ -616,6 +625,30 @@ class Sabre_CardDAV_Plugin extends Sabre_DAV_ServerPlugin {
     }
 
     /**
+     * This event is triggered after webdav-properties have been retrieved.
+     *
+     * @return bool
+     */
+    public function afterGetProperties($uri, &$properties) {
+
+        // If the request was made using the SOGO connector, we must rewrite
+        // the content-type property. By default SabreDAV will send back
+        // text/x-vcard; charset=utf-8, but for SOGO we must strip that last
+        // part.
+        if (!isset($properties[200]['{DAV:}getcontenttype']))
+            return;
+
+        if (strpos($this->server->httpRequest->getHeader('User-Agent'),'Thunderbird')===false) {
+            return;
+        }
+
+        if (strpos($properties[200]['{DAV:}getcontenttype'],'text/x-vcard')===0) {
+            $properties[200]['{DAV:}getcontenttype'] = 'text/x-vcard';
+        }
+
+    }
+
+    /**
      * This method is used to generate HTML output for the
      * Sabre_DAV_Browser_Plugin. This allows us to generate an interface users
      * can use to create new calendars.
diff --git a/3rdparty/Sabre/CardDAV/VCFExportPlugin.php b/3rdparty/Sabre/CardDAV/VCFExportPlugin.php
new file mode 100755
index 00000000000..8850fef8afb
--- /dev/null
+++ b/3rdparty/Sabre/CardDAV/VCFExportPlugin.php
@@ -0,0 +1,107 @@
+<?php
+
+use Sabre\VObject;
+
+/**
+ * VCF Exporter
+ *
+ * This plugin adds the ability to export entire address books as .vcf files.
+ * This is useful for clients that don't support CardDAV yet. They often do
+ * support vcf files.
+ *
+ * @package Sabre
+ * @subpackage CardDAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @author Thomas Tanghus (http://tanghus.net/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+class Sabre_CardDAV_VCFExportPlugin extends Sabre_DAV_ServerPlugin {
+
+    /**
+     * Reference to Server class
+     *
+     * @var Sabre_DAV_Server
+     */
+    private $server;
+
+    /**
+     * Initializes the plugin and registers event handlers
+     *
+     * @param Sabre_DAV_Server $server
+     * @return void
+     */
+    public function initialize(Sabre_DAV_Server $server) {
+
+        $this->server = $server;
+        $this->server->subscribeEvent('beforeMethod',array($this,'beforeMethod'), 90);
+
+    }
+
+    /**
+     * 'beforeMethod' event handles. This event handles intercepts GET requests ending
+     * with ?export
+     *
+     * @param string $method
+     * @param string $uri
+     * @return bool
+     */
+    public function beforeMethod($method, $uri) {
+
+        if ($method!='GET') return;
+        if ($this->server->httpRequest->getQueryString()!='export') return;
+
+        // splitting uri
+        list($uri) = explode('?',$uri,2);
+
+        $node = $this->server->tree->getNodeForPath($uri);
+
+        if (!($node instanceof Sabre_CardDAV_IAddressBook)) return;
+
+        // Checking ACL, if available.
+        if ($aclPlugin = $this->server->getPlugin('acl')) {
+            $aclPlugin->checkPrivileges($uri, '{DAV:}read');
+        }
+
+        $this->server->httpResponse->setHeader('Content-Type','text/directory');
+        $this->server->httpResponse->sendStatus(200);
+
+        $nodes = $this->server->getPropertiesForPath($uri, array(
+            '{' . Sabre_CardDAV_Plugin::NS_CARDDAV . '}address-data',
+        ),1);
+
+        $this->server->httpResponse->sendBody($this->generateVCF($nodes));
+
+        // Returning false to break the event chain
+        return false;
+
+    }
+
+    /**
+     * Merges all vcard objects, and builds one big vcf export
+     *
+     * @param array $nodes
+     * @return string
+     */
+    public function generateVCF(array $nodes) {
+
+        $output = "";
+
+        foreach($nodes as $node) {
+
+            if (!isset($node[200]['{' . Sabre_CardDAV_Plugin::NS_CARDDAV . '}address-data'])) {
+                continue;
+            }
+            $nodeData = $node[200]['{' . Sabre_CardDAV_Plugin::NS_CARDDAV . '}address-data'];
+
+            // Parsing this node so VObject can clean up the output.
+            $output .=
+               VObject\Reader::read($nodeData)->serialize();
+
+        }
+
+        return $output;
+
+    }
+
+}
diff --git a/3rdparty/Sabre/CardDAV/Version.php b/3rdparty/Sabre/CardDAV/Version.php
index d0623f0d3e8..6b70a2df9b5 100755
--- a/3rdparty/Sabre/CardDAV/Version.php
+++ b/3rdparty/Sabre/CardDAV/Version.php
@@ -16,7 +16,7 @@ class Sabre_CardDAV_Version {
     /**
      * Full version number
      */
-    const VERSION = '1.6.3';
+    const VERSION = '1.7.0';
 
     /**
      * Stability : alpha, beta, stable
diff --git a/3rdparty/Sabre/CardDAV/includes.php b/3rdparty/Sabre/CardDAV/includes.php
index c3b8c04b077..08b4f76bd01 100755
--- a/3rdparty/Sabre/CardDAV/includes.php
+++ b/3rdparty/Sabre/CardDAV/includes.php
@@ -26,6 +26,7 @@ include __DIR__ . '/IDirectory.php';
 include __DIR__ . '/Plugin.php';
 include __DIR__ . '/Property/SupportedAddressData.php';
 include __DIR__ . '/UserAddressBooks.php';
+include __DIR__ . '/VCFExportPlugin.php';
 include __DIR__ . '/Version.php';
 include __DIR__ . '/AddressBook.php';
 include __DIR__ . '/Card.php';
diff --git a/3rdparty/Sabre/DAV/Browser/Plugin.php b/3rdparty/Sabre/DAV/Browser/Plugin.php
index 09bbdd2ae02..b6440ab6340 100755
--- a/3rdparty/Sabre/DAV/Browser/Plugin.php
+++ b/3rdparty/Sabre/DAV/Browser/Plugin.php
@@ -338,7 +338,7 @@ class Sabre_DAV_Browser_Plugin extends Sabre_DAV_ServerPlugin {
             $icon = '';
 
             if ($this->enableAssets) {
-                $node = $parent->getChild($name);
+                $node = $this->server->tree->getNodeForPath(($path?$path.'/':'') . $name);
                 foreach(array_reverse($this->iconMap) as $class=>$iconName) {
 
                     if ($node instanceof $class) {
diff --git a/3rdparty/Sabre/DAV/Client.php b/3rdparty/Sabre/DAV/Client.php
index 9a428765e90..9d9f4c96b02 100755
--- a/3rdparty/Sabre/DAV/Client.php
+++ b/3rdparty/Sabre/DAV/Client.php
@@ -16,12 +16,25 @@
  */
 class Sabre_DAV_Client {
 
+    /**
+     * The propertyMap is a key-value array.
+     *
+     * If you use the propertyMap, any {DAV:}multistatus responses with the
+     * proeprties listed in this array, will automatically be mapped to a
+     * respective class.
+     *
+     * The {DAV:}resourcetype property is automatically added. This maps to
+     * Sabre_DAV_Property_ResourceType
+     *
+     * @var array
+     */
     public $propertyMap = array();
 
     protected $baseUri;
     protected $userName;
     protected $password;
     protected $proxy;
+    protected $trustedCertificates;
 
     /**
      * Basic authentication
@@ -88,6 +101,18 @@ class Sabre_DAV_Client {
     }
 
     /**
+     * Add trusted root certificates to the webdav client.
+     *
+     * The parameter certificates should be a absulute path to a file
+     * which contains all trusted certificates
+     *
+     * @param string $certificates
+     */
+    public function addTrustedCertificates($certificates) {
+        $this->trustedCertificates = $certificates;
+    }
+
+    /**
      * Does a PROPFIND request
      *
      * The list of requested properties must be specified as an array, in clark
@@ -143,13 +168,13 @@ class Sabre_DAV_Client {
         if ($depth===0) {
             reset($result);
             $result = current($result);
-            return $result[200];
+            return isset($result[200])?$result[200]:array();
         }
 
         $newResult = array();
         foreach($result as $href => $statusList) {
 
-            $newResult[$href] = $statusList[200];
+            $newResult[$href] = isset($statusList[200])?$statusList[200]:array();
 
         }
 
@@ -279,6 +304,10 @@ class Sabre_DAV_Client {
             CURLOPT_MAXREDIRS => 5,
         );
 
+        if($this->trustedCertificates) {
+            $curlSettings[CURLOPT_CAINFO] = $this->trustedCertificates;
+        }
+
         switch ($method) {
             case 'HEAD' :
 
@@ -363,10 +392,30 @@ class Sabre_DAV_Client {
 
         if ($response['statusCode']>=400) {
             switch ($response['statusCode']) {
+                case 400 :
+                    throw new Sabre_DAV_Exception_BadRequest('Bad request');
+                case 401 :
+                    throw new Sabre_DAV_Exception_NotAuthenticated('Not authenticated');
+                case 402 :
+                    throw new Sabre_DAV_Exception_PaymentRequired('Payment required');
+                case 403 :
+                    throw new Sabre_DAV_Exception_Forbidden('Forbidden');
                 case 404:
-                    throw new Sabre_DAV_Exception_NotFound('Resource ' . $url . ' not found.');
-                    break;
-
+                    throw new Sabre_DAV_Exception_NotFound('Resource not found.');
+                case 405 :
+                    throw new Sabre_DAV_Exception_MethodNotAllowed('Method not allowed');
+                case 409 :
+                    throw new Sabre_DAV_Exception_Conflict('Conflict');
+                case 412 :
+                    throw new Sabre_DAV_Exception_PreconditionFailed('Precondition failed');
+                case 416 :
+                    throw new Sabre_DAV_Exception_RequestedRangeNotSatisfiable('Requested Range Not Satisfiable');
+                case 500 :
+                    throw new Sabre_DAV_Exception('Internal server error');
+                case 501 :
+                    throw new Sabre_DAV_Exception_NotImplemented('Not Implemented');
+                case 507 :
+                    throw new Sabre_DAV_Exception_InsufficientStorage('Insufficient storage');
                 default:
                     throw new Sabre_DAV_Exception('HTTP error response. (errorcode ' . $response['statusCode'] . ')');
             }
@@ -386,6 +435,7 @@ class Sabre_DAV_Client {
      * @param array $settings
      * @return array
      */
+    // @codeCoverageIgnoreStart
     protected function curlRequest($url, $settings) {
 
         $curl = curl_init($url);
@@ -399,6 +449,7 @@ class Sabre_DAV_Client {
         );
 
     }
+    // @codeCoverageIgnoreEnd
 
     /**
      * Returns the full url based on the given url (which may be relative). All
@@ -453,19 +504,17 @@ class Sabre_DAV_Client {
      */
     public function parseMultiStatus($body) {
 
-        $body = Sabre_DAV_XMLUtil::convertDAVNamespace($body);
-
         $responseXML = simplexml_load_string($body, null, LIBXML_NOBLANKS | LIBXML_NOCDATA);
         if ($responseXML===false) {
             throw new InvalidArgumentException('The passed data is not valid XML');
         }
 
-        $responseXML->registerXPathNamespace('d', 'urn:DAV');
+        $responseXML->registerXPathNamespace('d', 'DAV:');
 
         $propResult = array();
 
         foreach($responseXML->xpath('d:response') as $response) {
-            $response->registerXPathNamespace('d', 'urn:DAV');
+            $response->registerXPathNamespace('d', 'DAV:');
             $href = $response->xpath('d:href');
             $href = (string)$href[0];
 
@@ -473,7 +522,7 @@ class Sabre_DAV_Client {
 
             foreach($response->xpath('d:propstat') as $propStat) {
 
-                $propStat->registerXPathNamespace('d', 'urn:DAV');
+                $propStat->registerXPathNamespace('d', 'DAV:');
                 $status = $propStat->xpath('d:status');
                 list($httpVersion, $statusCode, $message) = explode(' ', (string)$status[0],3);
 
diff --git a/3rdparty/Sabre/DAV/Collection.php b/3rdparty/Sabre/DAV/Collection.php
index 776c22531b2..c7648a8a52d 100755
--- a/3rdparty/Sabre/DAV/Collection.php
+++ b/3rdparty/Sabre/DAV/Collection.php
@@ -17,9 +17,13 @@ abstract class Sabre_DAV_Collection extends Sabre_DAV_Node implements Sabre_DAV_
     /**
      * Returns a child object, by its name.
      *
-     * This method makes use of the getChildren method to grab all the child nodes, and compares the name.
+     * This method makes use of the getChildren method to grab all the child
+     * nodes, and compares the name.
      * Generally its wise to override this, as this can usually be optimized
      *
+     * This method must throw Sabre_DAV_Exception_NotFound if the node does not
+     * exist.
+     *
      * @param string $name
      * @throws Sabre_DAV_Exception_NotFound
      * @return Sabre_DAV_INode
diff --git a/3rdparty/Sabre/DAV/Directory.php b/3rdparty/Sabre/DAV/Directory.php
deleted file mode 100755
index 6db8febc02e..00000000000
--- a/3rdparty/Sabre/DAV/Directory.php
+++ /dev/null
@@ -1,17 +0,0 @@
-<?php
-
-/**
- * Directory class
- *
- * This class is now deprecated in favor of the Sabre_DAV_Collection class.
- *
- * @package Sabre
- * @subpackage DAV
- * @deprecated Use Sabre_DAV_Collection instead
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/) 
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- */
-abstract class Sabre_DAV_Directory extends Sabre_DAV_Collection {
-}
-
diff --git a/3rdparty/Sabre/DAV/Exception/ReportNotImplemented.php b/3rdparty/Sabre/DAV/Exception/ReportNotSupported.php
index e86800f3038..a2906865f8e 100755
--- a/3rdparty/Sabre/DAV/Exception/ReportNotImplemented.php
+++ b/3rdparty/Sabre/DAV/Exception/ReportNotSupported.php
@@ -1,7 +1,7 @@
 <?php
 
 /**
- * ReportNotImplemented
+ * ReportNotSupported
  *
  * This exception is thrown when the client requested an unknown report through the REPORT method
  *
@@ -11,7 +11,7 @@
  * @author Evert Pot (http://www.rooftopsolutions.nl/) 
  * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
  */
-class Sabre_DAV_Exception_ReportNotImplemented extends Sabre_DAV_Exception_NotImplemented {
+class Sabre_DAV_Exception_ReportNotSupported extends Sabre_DAV_Exception_Forbidden {
 
     /**
      * This method allows the exception to include additional information into the WebDAV error response
diff --git a/3rdparty/Sabre/DAV/FS/Directory.php b/3rdparty/Sabre/DAV/FS/Directory.php
index 3af2d755583..72fec744d0f 100755
--- a/3rdparty/Sabre/DAV/FS/Directory.php
+++ b/3rdparty/Sabre/DAV/FS/Directory.php
@@ -17,7 +17,7 @@ class Sabre_DAV_FS_Directory extends Sabre_DAV_FS_Node implements Sabre_DAV_ICol
      * Data will either be supplied as a stream resource, or in certain cases
      * as a string. Keep in mind that you may have to support either.
      *
-     * After succesful creation of the file, you may choose to return the ETag
+     * After successful creation of the file, you may choose to return the ETag
      * of the new file here.
      *
      * The returned ETag must be surrounded by double-quotes (The quotes should
@@ -58,6 +58,9 @@ class Sabre_DAV_FS_Directory extends Sabre_DAV_FS_Node implements Sabre_DAV_ICol
     /**
      * Returns a specific child node, referenced by its name
      *
+     * This method must throw Sabre_DAV_Exception_NotFound if the node does not
+     * exist.
+     *
      * @param string $name
      * @throws Sabre_DAV_Exception_NotFound
      * @return Sabre_DAV_INode
diff --git a/3rdparty/Sabre/DAV/FSExt/Directory.php b/3rdparty/Sabre/DAV/FSExt/Directory.php
index 540057183b3..70dfdc2c3b5 100755
--- a/3rdparty/Sabre/DAV/FSExt/Directory.php
+++ b/3rdparty/Sabre/DAV/FSExt/Directory.php
@@ -17,7 +17,7 @@ class Sabre_DAV_FSExt_Directory extends Sabre_DAV_FSExt_Node implements Sabre_DA
      * Data will either be supplied as a stream resource, or in certain cases
      * as a string. Keep in mind that you may have to support either.
      *
-     * After succesful creation of the file, you may choose to return the ETag
+     * After successful creation of the file, you may choose to return the ETag
      * of the new file here.
      *
      * The returned ETag must be surrounded by double-quotes (The quotes should
@@ -64,6 +64,9 @@ class Sabre_DAV_FSExt_Directory extends Sabre_DAV_FSExt_Node implements Sabre_DA
     /**
      * Returns a specific child node, referenced by its name
      *
+     * This method must throw Sabre_DAV_Exception_NotFound if the node does not
+     * exist.
+     *
      * @param string $name
      * @throws Sabre_DAV_Exception_NotFound
      * @return Sabre_DAV_INode
diff --git a/3rdparty/Sabre/DAV/FSExt/File.php b/3rdparty/Sabre/DAV/FSExt/File.php
index b93ce5aee21..590fb808e61 100755
--- a/3rdparty/Sabre/DAV/FSExt/File.php
+++ b/3rdparty/Sabre/DAV/FSExt/File.php
@@ -9,15 +9,15 @@
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
  */
-class Sabre_DAV_FSExt_File extends Sabre_DAV_FSExt_Node implements Sabre_DAV_IFile {
+class Sabre_DAV_FSExt_File extends Sabre_DAV_FSExt_Node implements Sabre_DAV_PartialUpdate_IFile {
 
     /**
      * Updates the data
      *
      * data is a readable stream resource.
      *
-     * @param resource $data
-     * @return void
+     * @param resource|string $data
+     * @return string
      */
     public function put($data) {
 
@@ -27,9 +27,33 @@ class Sabre_DAV_FSExt_File extends Sabre_DAV_FSExt_Node implements Sabre_DAV_IFi
     }
 
     /**
+     * Updates the data at a given offset
+     *
+     * The data argument is a readable stream resource.
+     * The offset argument is a 0-based offset where the data should be
+     * written.
+     *
+     * param resource|string $data
+     * @return void
+     */
+    public function putRange($data, $offset) {
+
+        $f = fopen($this->path, 'c');
+        fseek($f,$offset-1);
+        if (is_string($data)) {
+            fwrite($f, $data);
+        } else {
+            stream_copy_to_stream($data,$f);
+        }
+        fclose($f);
+        return '"' . md5_file($this->path) . '"';
+
+    }
+
+    /**
      * Returns the data
      *
-     * @return string
+     * @return resource
      */
     public function get() {
 
diff --git a/3rdparty/Sabre/DAV/ICollection.php b/3rdparty/Sabre/DAV/ICollection.php
index 4626038a66e..94431a0c496 100755
--- a/3rdparty/Sabre/DAV/ICollection.php
+++ b/3rdparty/Sabre/DAV/ICollection.php
@@ -19,7 +19,7 @@ interface Sabre_DAV_ICollection extends Sabre_DAV_INode {
      * Data will either be supplied as a stream resource, or in certain cases
      * as a string. Keep in mind that you may have to support either.
      *
-     * After succesful creation of the file, you may choose to return the ETag
+     * After successful creation of the file, you may choose to return the ETag
      * of the new file here.
      *
      * The returned ETag must be surrounded by double-quotes (The quotes should
@@ -50,6 +50,9 @@ interface Sabre_DAV_ICollection extends Sabre_DAV_INode {
     /**
      * Returns a specific child node, referenced by its name
      *
+     * This method must throw Sabre_DAV_Exception_NotFound if the node does not
+     * exist.
+     *
      * @param string $name
      * @return Sabre_DAV_INode
      */
diff --git a/3rdparty/Sabre/DAV/IFile.php b/3rdparty/Sabre/DAV/IFile.php
index 478f822ae71..1eca8986a5c 100755
--- a/3rdparty/Sabre/DAV/IFile.php
+++ b/3rdparty/Sabre/DAV/IFile.php
@@ -51,7 +51,7 @@ interface Sabre_DAV_IFile extends Sabre_DAV_INode {
      *
      * If null is returned, we'll assume application/octet-stream
      *
-     * @return void
+     * @return string|null
      */
     function getContentType();
 
diff --git a/3rdparty/Sabre/DAV/Locks/Plugin.php b/3rdparty/Sabre/DAV/Locks/Plugin.php
index 035b3a63863..957ac506a9c 100755
--- a/3rdparty/Sabre/DAV/Locks/Plugin.php
+++ b/3rdparty/Sabre/DAV/Locks/Plugin.php
@@ -152,6 +152,7 @@ class Sabre_DAV_Locks_Plugin extends Sabre_DAV_ServerPlugin {
             case 'MKCOL' :
             case 'PROPPATCH' :
             case 'PUT' :
+            case 'PATCH' :
                 $lastLock = null;
                 if (!$this->validateLock($uri,$lastLock))
                     throw new Sabre_DAV_Exception_Locked($lastLock);
diff --git a/3rdparty/Sabre/DAV/Node.php b/3rdparty/Sabre/DAV/Node.php
index 070b7176afd..3b95dfec2fa 100755
--- a/3rdparty/Sabre/DAV/Node.php
+++ b/3rdparty/Sabre/DAV/Node.php
@@ -27,7 +27,7 @@ abstract class Sabre_DAV_Node implements Sabre_DAV_INode {
     }
 
     /**
-     * Deleted the current node
+     * Deletes the current node
      *
      * @throws Sabre_DAV_Exception_Forbidden
      * @return void
diff --git a/3rdparty/Sabre/DAV/ObjectTree.php b/3rdparty/Sabre/DAV/ObjectTree.php
index bce51463900..3b7f222d64b 100755
--- a/3rdparty/Sabre/DAV/ObjectTree.php
+++ b/3rdparty/Sabre/DAV/ObjectTree.php
@@ -51,24 +51,30 @@ class Sabre_DAV_ObjectTree extends Sabre_DAV_Tree {
         $path = trim($path,'/');
         if (isset($this->cache[$path])) return $this->cache[$path];
 
-        //if (!$path || $path=='.') return $this->rootNode;
-        $currentNode = $this->rootNode;
+        // Is it the root node?
+        if (!strlen($path)) {
+            return $this->rootNode;
+        }
 
-        // We're splitting up the path variable into folder/subfolder components and traverse to the correct node..
-        foreach(explode('/',$path) as $pathPart) {
+        // Attempting to fetch its parent
+        list($parentName, $baseName) = Sabre_DAV_URLUtil::splitPath($path);
 
-            // If this part of the path is just a dot, it actually means we can skip it
-            if ($pathPart=='.' || $pathPart=='') continue;
+        // If there was no parent, we must simply ask it from the root node.
+        if ($parentName==="") {
+            $node = $this->rootNode->getChild($baseName);
+        } else {
+            // Otherwise, we recursively grab the parent and ask him/her.
+            $parent = $this->getNodeForPath($parentName);
 
-            if (!($currentNode instanceof Sabre_DAV_ICollection))
+            if (!($parent instanceof Sabre_DAV_ICollection))
                 throw new Sabre_DAV_Exception_NotFound('Could not find node at path: ' . $path);
 
-            $currentNode = $currentNode->getChild($pathPart);
+            $node = $parent->getChild($baseName);
 
         }
 
-        $this->cache[$path] = $currentNode;
-        return $currentNode;
+        $this->cache[$path] = $node;
+        return $node;
 
     }
 
diff --git a/3rdparty/Sabre/DAV/PartialUpdate/IFile.php b/3rdparty/Sabre/DAV/PartialUpdate/IFile.php
new file mode 100755
index 00000000000..cf5ad55c6de
--- /dev/null
+++ b/3rdparty/Sabre/DAV/PartialUpdate/IFile.php
@@ -0,0 +1,38 @@
+<?php
+
+/**
+ * This interface provides a way to modify only part of a target resource
+ * It may be used to update a file chunk, upload big a file into smaller
+ * chunks or resume an upload
+ *
+ * @package Sabre
+ * @subpackage DAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Jean-Tiare LE BIGOT (http://www.jtlebi.fr/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+interface Sabre_DAV_PartialUpdate_IFile extends Sabre_DAV_IFile {
+
+    /**
+     * Updates the data at a given offset
+     *
+     * The data argument is a readable stream resource.
+     * The offset argument is an integer describing the offset. Contrary to
+     * what's sent in the request, the offset here is a 0-based index.
+     *
+     * After a successful put operation, you may choose to return an ETag. The
+     * etag must always be surrounded by double-quotes. These quotes must
+     * appear in the actual string you're returning.
+     *
+     * Clients may use the ETag from a PUT request to later on make sure that
+     * when they update the file, the contents haven't changed in the mean
+     * time.
+     *
+     * @param resource $data
+     * @param integer $offset
+     * @return string|null
+     */
+    function putRange($data, $offset);
+
+}
+
diff --git a/3rdparty/Sabre/DAV/PartialUpdate/Plugin.php b/3rdparty/Sabre/DAV/PartialUpdate/Plugin.php
new file mode 100755
index 00000000000..170acbc9785
--- /dev/null
+++ b/3rdparty/Sabre/DAV/PartialUpdate/Plugin.php
@@ -0,0 +1,209 @@
+<?php
+/**
+ * Partial update plugin (Patch method)
+ *
+ * This plugin provides a way to modify only part of a target resource
+ * It may bu used to update a file chunk, upload big a file into smaller
+ * chunks or resume an upload.
+ *
+ * $patchPlugin = new Sabre_DAV_Patch_Plugin();
+ * $server->addPlugin($patchPlugin);
+ *
+ * @package Sabre
+ * @subpackage DAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Jean-Tiare LE BIGOT (http://www.jtlebi.fr/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+class Sabre_DAV_PartialUpdate_Plugin extends Sabre_DAV_ServerPlugin {
+
+    /**
+     * Reference to server
+     *
+     * @var Sabre_DAV_Server
+     */
+    protected $server;
+
+    /**
+     * Initializes the plugin
+     *
+     * This method is automatically called by the Server class after addPlugin.
+     *
+     * @param Sabre_DAV_Server $server
+     * @return void
+     */
+    public function initialize(Sabre_DAV_Server $server) {
+
+        $this->server = $server;
+        $server->subscribeEvent('unknownMethod',array($this,'unknownMethod'));
+
+    }
+
+    /**
+     * Returns a plugin name.
+     *
+     * Using this name other plugins will be able to access other plugins
+     * using Sabre_DAV_Server::getPlugin
+     *
+     * @return string
+     */
+    public function getPluginName() {
+
+        return 'partialupdate';
+
+    }
+
+    /**
+     * This method is called by the Server if the user used an HTTP method
+     * the server didn't recognize.
+     *
+     * This plugin intercepts the PATCH methods.
+     *
+     * @param string $method
+     * @param string $uri
+     * @return bool|null
+     */
+    public function unknownMethod($method, $uri) {
+
+        switch($method) {
+            
+            case 'PATCH':
+                return $this->httpPatch($uri);
+
+        }
+
+    }
+
+    /**
+     * Use this method to tell the server this plugin defines additional
+     * HTTP methods.
+     *
+     * This method is passed a uri. It should only return HTTP methods that are
+     * available for the specified uri.
+     * 
+     * We claim to support PATCH method (partial update) if and only if
+     *     - the node exist
+     *     - the node implements our partial update interface
+     *
+     * @param string $uri
+     * @return array
+     */
+    public function getHTTPMethods($uri) {
+        
+        $tree = $this->server->tree;
+        
+        if ($tree->nodeExists($uri) && 
+            $tree->getNodeForPath($uri) instanceof Sabre_DAV_PartialUpdate_IFile) {
+            return array('PATCH');
+         }
+         
+         return array();
+
+    }
+
+    /**
+     * Returns a list of features for the HTTP OPTIONS Dav: header.
+     *
+     * @return array
+     */
+    public function getFeatures() {
+
+        return array('sabredav-partialupdate');
+
+    }
+
+    /**
+     * Patch an uri
+     *
+     * The WebDAV patch request can be used to modify only a part of an 
+     * existing resource. If the resource does not exist yet and the first
+     * offset is not 0, the request fails
+     *
+     * @param string $uri
+     * @return void
+     */
+    protected function httpPatch($uri) {
+
+        // Get the node. Will throw a 404 if not found
+        $node = $this->server->tree->getNodeForPath($uri);
+        if (!($node instanceof Sabre_DAV_PartialUpdate_IFile)) {
+            throw new Sabre_DAV_Exception_MethodNotAllowed('The target resource does not support the PATCH method.');
+        }
+
+        $range = $this->getHTTPUpdateRange();
+
+        if (!$range) {
+            throw new Sabre_DAV_Exception_BadRequest('No valid "X-Update-Range" found in the headers');
+        }
+        
+        $contentType = strtolower(
+            $this->server->httpRequest->getHeader('Content-Type')
+        );
+        
+        if ($contentType != 'application/x-sabredav-partialupdate') {
+            throw new Sabre_DAV_Exception_UnsupportedMediaType('Unknown Content-Type header "' . $contentType . '"');
+        }
+
+        $len = $this->server->httpRequest->getHeader('Content-Length');
+
+        // Load the begin and end data
+        $start = ($range[0])?$range[0]:0;
+        $end   = ($range[1])?$range[1]:$len-1;
+
+        // Check consistency
+        if($end < $start)
+            throw new Sabre_DAV_Exception_RequestedRangeNotSatisfiable('The end offset (' . $range[1] . ') is lower than the start offset (' . $range[0] . ')');
+        if($end - $start + 1 != $len)
+            throw new Sabre_DAV_Exception_RequestedRangeNotSatisfiable('Actual data length (' . $len . ') is not consistent with begin (' . $range[0] . ') and end (' . $range[1] . ') offsets');
+
+        // Checking If-None-Match and related headers.
+        if (!$this->server->checkPreconditions()) return;
+
+        if (!$this->server->broadcastEvent('beforeWriteContent',array($uri, $node, null)))
+            return;
+
+        $body = $this->server->httpRequest->getBody();
+        $etag = $node->putRange($body, $start-1);
+
+        $this->server->broadcastEvent('afterWriteContent',array($uri, $node));
+
+        $this->server->httpResponse->setHeader('Content-Length','0');
+        if ($etag) $this->server->httpResponse->setHeader('ETag',$etag);
+        $this->server->httpResponse->sendStatus(204);
+
+        return false;
+
+    }
+    
+   /**
+     * Returns the HTTP custom range update header
+     *
+     * This method returns null if there is no well-formed HTTP range request
+     * header or array($start, $end).
+     *
+     * The first number is the offset of the first byte in the range.
+     * The second number is the offset of the last byte in the range.
+     *
+     * If the second offset is null, it should be treated as the offset of the last byte of the entity
+     * If the first offset is null, the second offset should be used to retrieve the last x bytes of the entity
+     *
+     * @return array|null
+     */
+    public function getHTTPUpdateRange() {
+
+        $range = $this->server->httpRequest->getHeader('X-Update-Range');
+        if (is_null($range)) return null;
+
+        // Matching "Range: bytes=1234-5678: both numbers are optional
+
+        if (!preg_match('/^bytes=([0-9]*)-([0-9]*)$/i',$range,$matches)) return null;
+
+        if ($matches[1]==='' && $matches[2]==='') return null;
+
+        return array(
+            $matches[1]!==''?$matches[1]:null,
+            $matches[2]!==''?$matches[2]:null,
+        );
+
+    }
+}
diff --git a/3rdparty/Sabre/DAV/Property.php b/3rdparty/Sabre/DAV/Property.php
index 1cfada3236c..6487bf44bc4 100755
--- a/3rdparty/Sabre/DAV/Property.php
+++ b/3rdparty/Sabre/DAV/Property.php
@@ -11,10 +11,16 @@
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
  */
-abstract class Sabre_DAV_Property {
-
-    abstract function serialize(Sabre_DAV_Server $server, DOMElement $prop);
+abstract class Sabre_DAV_Property implements Sabre_DAV_PropertyInterface {
 
+    /**
+     * Unserializes the property.
+     *
+     * This static method should return a an instance of this object.
+     *
+     * @param DOMElement $prop
+     * @return Sabre_DAV_IProperty
+     */
     static function unserialize(DOMElement $prop) {
 
         throw new Sabre_DAV_Exception('Unserialize has not been implemented for this class');
diff --git a/3rdparty/Sabre/DAV/Property/Href.php b/3rdparty/Sabre/DAV/Property/Href.php
index dac564f24d7..cd1d867f71b 100755
--- a/3rdparty/Sabre/DAV/Property/Href.php
+++ b/3rdparty/Sabre/DAV/Property/Href.php
@@ -82,7 +82,7 @@ class Sabre_DAV_Property_Href extends Sabre_DAV_Property implements Sabre_DAV_Pr
      */
     static function unserialize(DOMElement $dom) {
 
-        if (Sabre_DAV_XMLUtil::toClarkNotation($dom->firstChild)==='{DAV:}href') {
+        if ($dom->firstChild && Sabre_DAV_XMLUtil::toClarkNotation($dom->firstChild)==='{DAV:}href') {
             return new self($dom->firstChild->textContent,false);
         }
 
diff --git a/3rdparty/Sabre/DAV/Property/HrefList.php b/3rdparty/Sabre/DAV/Property/HrefList.php
index 7a52272e885..282c452ca0b 100755
--- a/3rdparty/Sabre/DAV/Property/HrefList.php
+++ b/3rdparty/Sabre/DAV/Property/HrefList.php
@@ -79,7 +79,7 @@ class Sabre_DAV_Property_HrefList extends Sabre_DAV_Property {
      * It will only decode {DAV:}href values.
      *
      * @param DOMElement $dom
-     * @return Sabre_DAV_Property_Href
+     * @return Sabre_DAV_Property_HrefList
      */
     static function unserialize(DOMElement $dom) {
 
diff --git a/3rdparty/Sabre/DAV/Property/Response.php b/3rdparty/Sabre/DAV/Property/Response.php
index 88afbcfb26d..9f21163d12e 100755
--- a/3rdparty/Sabre/DAV/Property/Response.php
+++ b/3rdparty/Sabre/DAV/Property/Response.php
@@ -138,7 +138,7 @@ class Sabre_DAV_Property_Response extends Sabre_DAV_Property implements Sabre_DA
                 if (is_scalar($propertyValue)) {
                     $text = $document->createTextNode($propertyValue);
                     $currentProperty->appendChild($text);
-                } elseif ($propertyValue instanceof Sabre_DAV_Property) {
+                } elseif ($propertyValue instanceof Sabre_DAV_PropertyInterface) {
                     $propertyValue->serialize($server,$currentProperty);
                 } elseif (!is_null($propertyValue)) {
                     throw new Sabre_DAV_Exception('Unknown property value type: ' . gettype($propertyValue) . ' for property: ' . $propertyName);
diff --git a/3rdparty/Sabre/DAV/PropertyInterface.php b/3rdparty/Sabre/DAV/PropertyInterface.php
new file mode 100755
index 00000000000..515072cbd35
--- /dev/null
+++ b/3rdparty/Sabre/DAV/PropertyInterface.php
@@ -0,0 +1,21 @@
+<?php
+
+/**
+ * PropertyInterface
+ *
+ * Implement this interface to create new complex properties
+ *
+ * @package Sabre
+ * @subpackage DAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+interface Sabre_DAV_PropertyInterface {
+
+    public function serialize(Sabre_DAV_Server $server, DOMElement $prop);
+
+    static function unserialize(DOMElement $prop); 
+
+}
+
diff --git a/3rdparty/Sabre/DAV/Server.php b/3rdparty/Sabre/DAV/Server.php
index 0dfac8b0c71..cf6f87e68ab 100755
--- a/3rdparty/Sabre/DAV/Server.php
+++ b/3rdparty/Sabre/DAV/Server.php
@@ -12,7 +12,7 @@
 class Sabre_DAV_Server {
 
     /**
-     * Inifinity is used for some request supporting the HTTP Depth header and indicates that the operation should traverse the entire tree
+     * Infinity is used for some request supporting the HTTP Depth header and indicates that the operation should traverse the entire tree
      */
     const DEPTH_INFINITY = -1;
 
@@ -102,7 +102,6 @@ class Sabre_DAV_Server {
         '{DAV:}getetag',
         '{DAV:}getlastmodified',
         '{DAV:}lockdiscovery',
-        '{DAV:}resourcetype',
         '{DAV:}supportedlock',
 
         // RFC4331
@@ -162,7 +161,7 @@ class Sabre_DAV_Server {
      * If an array is passed, we automatically create a root node, and use
      * the nodes in the array as top-level children.
      *
-     * @param Sabre_DAV_Tree|Sabre_DAV_INode|null $treeOrNode The tree object
+     * @param Sabre_DAV_Tree|Sabre_DAV_INode|array|null $treeOrNode The tree object
      */
     public function __construct($treeOrNode = null) {
 
@@ -207,6 +206,10 @@ class Sabre_DAV_Server {
 
         } catch (Exception $e) {
 
+            try {
+                $this->broadcastEvent('exception', array($e));
+            } catch (Exception $ignore) {
+            }
             $DOM = new DOMDocument('1.0','utf-8');
             $DOM->formatOutput = true;
 
@@ -214,17 +217,23 @@ class Sabre_DAV_Server {
             $error->setAttribute('xmlns:s',self::NS_SABREDAV);
             $DOM->appendChild($error);
 
-            $error->appendChild($DOM->createElement('s:exception',get_class($e)));
-            $error->appendChild($DOM->createElement('s:message',$e->getMessage()));
+            $h = function($v) {
+
+                return htmlspecialchars($v, ENT_NOQUOTES, 'UTF-8');
+
+            };
+
+            $error->appendChild($DOM->createElement('s:exception',$h(get_class($e))));
+            $error->appendChild($DOM->createElement('s:message',$h($e->getMessage())));
             if ($this->debugExceptions) {
-                $error->appendChild($DOM->createElement('s:file',$e->getFile()));
-                $error->appendChild($DOM->createElement('s:line',$e->getLine()));
-                $error->appendChild($DOM->createElement('s:code',$e->getCode()));
-                $error->appendChild($DOM->createElement('s:stacktrace',$e->getTraceAsString()));
+                $error->appendChild($DOM->createElement('s:file',$h($e->getFile())));
+                $error->appendChild($DOM->createElement('s:line',$h($e->getLine())));
+                $error->appendChild($DOM->createElement('s:code',$h($e->getCode())));
+                $error->appendChild($DOM->createElement('s:stacktrace',$h($e->getTraceAsString())));
 
             }
             if (self::$exposeVersion) {
-                $error->appendChild($DOM->createElement('s:sabredav-version',Sabre_DAV_Version::VERSION));
+                $error->appendChild($DOM->createElement('s:sabredav-version',$h(Sabre_DAV_Version::VERSION)));
             }
 
             if($e instanceof Sabre_DAV_Exception) {
@@ -508,7 +517,7 @@ class Sabre_DAV_Server {
 
         if (!$this->checkPreconditions(true)) return false;
 
-        if (!($node instanceof Sabre_DAV_IFile)) throw new Sabre_DAV_Exception_NotImplemented('GET is only implemented on File objects');
+        if (!$node instanceof Sabre_DAV_IFile) throw new Sabre_DAV_Exception_NotImplemented('GET is only implemented on File objects');
         $body = $node->get();
 
         // Converting string into stream, if needed.
@@ -696,6 +705,7 @@ class Sabre_DAV_Server {
         // This is a multi-status response
         $this->httpResponse->sendStatus(207);
         $this->httpResponse->setHeader('Content-Type','application/xml; charset=utf-8');
+        $this->httpResponse->setHeader('Vary','Brief,Prefer');
 
         // Normally this header is only needed for OPTIONS responses, however..
         // iCal seems to also depend on these being set for PROPFIND. Since
@@ -704,7 +714,10 @@ class Sabre_DAV_Server {
         foreach($this->plugins as $plugin) $features = array_merge($features,$plugin->getFeatures());
         $this->httpResponse->setHeader('DAV',implode(', ',$features));
 
-        $data = $this->generateMultiStatus($newProperties);
+        $prefer = $this->getHTTPPrefer();
+        $minimal = $prefer['return-minimal'];
+
+        $data = $this->generateMultiStatus($newProperties, $minimal);
         $this->httpResponse->sendBody($data);
 
     }
@@ -724,6 +737,30 @@ class Sabre_DAV_Server {
 
         $result = $this->updateProperties($uri, $newProperties);
 
+        $prefer = $this->getHTTPPrefer();
+        $this->httpResponse->setHeader('Vary','Brief,Prefer');
+
+        if ($prefer['return-minimal']) {
+
+            // If return-minimal is specified, we only have to check if the
+            // request was succesful, and don't need to return the
+            // multi-status.
+            $ok = true;
+            foreach($result as $code=>$prop) {
+                if ((int)$code > 299) {
+                    $ok = false;
+                }
+            }
+
+            if ($ok) {
+
+                $this->httpResponse->sendStatus(204);
+                return;
+
+            }
+
+        }
+
         $this->httpResponse->sendStatus(207);
         $this->httpResponse->setHeader('Content-Type','application/xml; charset=utf-8');
 
@@ -927,7 +964,7 @@ class Sabre_DAV_Server {
      * This method moves one uri to a different uri. A lot of the actual request processing is done in getCopyMoveInfo
      *
      * @param string $uri
-     * @return void
+     * @return bool
      */
     protected function httpMove($uri) {
 
@@ -1009,7 +1046,7 @@ class Sabre_DAV_Server {
         if ($this->broadcastEvent('report',array($reportName,$dom, $uri))) {
 
             // If broadcastEvent returned true, it means the report was not supported
-            throw new Sabre_DAV_Exception_ReportNotImplemented();
+            throw new Sabre_DAV_Exception_ReportNotSupported();
 
         }
 
@@ -1158,6 +1195,85 @@ class Sabre_DAV_Server {
 
     }
 
+    /**
+     * Returns the HTTP Prefer header information.
+     *
+     * The prefer header is defined in:
+     * http://tools.ietf.org/html/draft-snell-http-prefer-14
+     *
+     * This method will return an array with options.
+     *
+     * Currently, the following options may be returned:
+     *   array(
+     *      'return-asynch'         => true,
+     *      'return-minimal'        => true,
+     *      'return-representation' => true,
+     *      'wait'                  => 30,
+     *      'strict'                => true,
+     *      'lenient'               => true,
+     *   )
+     *
+     * This method also supports the Brief header, and will also return
+     * 'return-minimal' if the brief header was set to 't'.
+     *
+     * For the boolean options, false will be returned if the headers are not
+     * specified. For the integer options it will be 'null'.
+     *
+     * @return array
+     */
+    public function getHTTPPrefer() {
+
+        $result = array(
+            'return-asynch'         => false,
+            'return-minimal'        => false,
+            'return-representation' => false,
+            'wait'                  => null,
+            'strict'                => false,
+            'lenient'               => false,
+        );
+
+        if ($prefer = $this->httpRequest->getHeader('Prefer')) {
+
+            $parameters = array_map('trim',
+                explode(',', $prefer)
+            );
+
+            foreach($parameters as $parameter) {
+
+                // Right now our regex only supports the tokens actually
+                // specified in the draft. We may need to expand this if new
+                // tokens get registered.
+                if(!preg_match('/^(?P<token>[a-z0-9-]+)(?:=(?P<value>[0-9]+))?$/', $parameter, $matches)) {
+                    continue;
+                }
+
+                switch($matches['token']) {
+
+                    case 'return-asynch' :
+                    case 'return-minimal' :
+                    case 'return-representation' :
+                    case 'strict' :
+                    case 'lenient' :
+                        $result[$matches['token']] = true;
+                        break;
+                    case 'wait' :
+                        $result[$matches['token']] = $matches['value'];
+                        break;
+
+                }
+
+            }
+
+        }
+
+        if ($this->httpRequest->getHeader('Brief')=='t') {
+            $result['return-minimal'] = true;
+        }
+
+        return $result;
+
+    }
+
 
     /**
      * Returns information about Copy and Move requests
@@ -1433,15 +1549,18 @@ class Sabre_DAV_Server {
 
             }
 
-            $this->broadcastEvent('afterGetProperties',array(trim($myPath,'/'),&$newProperties));
+            $this->broadcastEvent('afterGetProperties',array(trim($myPath,'/'),&$newProperties, $node));
 
             $newProperties['href'] = trim($myPath,'/');
 
             // Its is a WebDAV recommendation to add a trailing slash to collectionnames.
-            // Apple's iCal also requires a trailing slash for principals (rfc 3744).
-            // Therefore we add a trailing / for any non-file. This might need adjustments
-            // if we find there are other edge cases.
-            if ($myPath!='' && isset($newProperties[200]['{DAV:}resourcetype']) && count($newProperties[200]['{DAV:}resourcetype']->getValue())>0) $newProperties['href'] .='/';
+            // Apple's iCal also requires a trailing slash for principals (rfc 3744), though this is non-standard.
+            if ($myPath!='' && isset($newProperties[200]['{DAV:}resourcetype'])) {
+                $rt = $newProperties[200]['{DAV:}resourcetype'];
+                if ($rt->is('{DAV:}collection') || $rt->is('{DAV:}principal')) {
+                    $newProperties['href'] .='/';
+                }
+            }
 
             // If the resourcetype property was manually added to the requested property list,
             // we will remove it again.
@@ -1476,11 +1595,14 @@ class Sabre_DAV_Server {
         if (!$this->broadcastEvent('beforeBind',array($uri))) return false;
 
         $parent = $this->tree->getNodeForPath($dir);
+        if (!$parent instanceof Sabre_DAV_ICollection) {
+            throw new Sabre_DAV_Exception_Conflict('Files can only be created as children of collections');
+        }
 
         if (!$this->broadcastEvent('beforeCreateFile',array($uri, &$data, $parent))) return false;
 
         $etag = $parent->createFile($name,$data);
-        $this->tree->markDirty($dir);
+        $this->tree->markDirty($dir . '/' . $name);
 
         $this->broadcastEvent('afterBind',array($uri));
         $this->broadcastEvent('afterCreateFile',array($uri, $parent));
@@ -1901,12 +2023,15 @@ class Sabre_DAV_Server {
 
 
     /**
-     * Generates a WebDAV propfind response body based on a list of nodes
+     * Generates a WebDAV propfind response body based on a list of nodes.
+     *
+     * If 'strip404s' is set to true, all 404 responses will be removed.
      *
      * @param array $fileProperties The list with nodes
+     * @param bool strip404s
      * @return string
      */
-    public function generateMultiStatus(array $fileProperties) {
+    public function generateMultiStatus(array $fileProperties, $strip404s = false) {
 
         $dom = new DOMDocument('1.0','utf-8');
         //$dom->formatOutput = true;
@@ -1925,6 +2050,10 @@ class Sabre_DAV_Server {
             $href = $entry['href'];
             unset($entry['href']);
 
+            if ($strip404s && isset($entry[404])) {
+                unset($entry[404]);
+            }
+
             $response = new Sabre_DAV_Property_Response($href,$entry);
             $response->serialize($this,$multiStatus);
 
@@ -1995,7 +2124,7 @@ class Sabre_DAV_Server {
         if (!$body) return array();
 
         $dom = Sabre_DAV_XMLUtil::loadDOMDocument($body);
-        $elem = $dom->getElementsByTagNameNS('urn:DAV','propfind')->item(0);
+        $elem = $dom->getElementsByTagNameNS('DAV:','propfind')->item(0);
         return array_keys(Sabre_DAV_XMLUtil::parseProperties($elem));
 
     }
diff --git a/3rdparty/Sabre/DAV/ServerPlugin.php b/3rdparty/Sabre/DAV/ServerPlugin.php
index 131863d13fb..120569ffccd 100755
--- a/3rdparty/Sabre/DAV/ServerPlugin.php
+++ b/3rdparty/Sabre/DAV/ServerPlugin.php
@@ -19,7 +19,7 @@ abstract class Sabre_DAV_ServerPlugin {
      * This function is called by Sabre_DAV_Server, after
      * addPlugin is called.
      *
-     * This method should set up the requires event subscriptions.
+     * This method should set up the required event subscriptions.
      *
      * @param Sabre_DAV_Server $server
      * @return void
diff --git a/3rdparty/Sabre/DAV/SimpleCollection.php b/3rdparty/Sabre/DAV/SimpleCollection.php
index 4acf971caa5..79e2eaaacd4 100755
--- a/3rdparty/Sabre/DAV/SimpleCollection.php
+++ b/3rdparty/Sabre/DAV/SimpleCollection.php
@@ -31,7 +31,7 @@ class Sabre_DAV_SimpleCollection extends Sabre_DAV_Collection {
     /**
      * Creates this node
      *
-     * The name of the node must be passed, child nodes can also be bassed.
+     * The name of the node must be passed, child nodes can also be passed.
      * This nodes must be instances of Sabre_DAV_INode
      *
      * @param string $name
@@ -78,6 +78,9 @@ class Sabre_DAV_SimpleCollection extends Sabre_DAV_Collection {
      * This method makes use of the getChildren method to grab all the child nodes, and compares the name.
      * Generally its wise to override this, as this can usually be optimized
      *
+     * This method must throw Sabre_DAV_Exception_NotFound if the node does not
+     * exist.
+     *
      * @param string $name
      * @throws Sabre_DAV_Exception_NotFound
      * @return Sabre_DAV_INode
diff --git a/3rdparty/Sabre/DAV/SimpleDirectory.php b/3rdparty/Sabre/DAV/SimpleDirectory.php
deleted file mode 100755
index 621222ebc53..00000000000
--- a/3rdparty/Sabre/DAV/SimpleDirectory.php
+++ /dev/null
@@ -1,21 +0,0 @@
-<?php
-
-/**
- * SimpleDirectory
- *
- * The SimpleDirectory is used to quickly setup static directory structures.
- * Just create the object with a proper name, and add children to use it.
- *
- * This class is now deprecated, use Sabre_DAV_SimpleCollection instead.
- *
- * @package Sabre
- * @subpackage DAV
- * @deprecated Use Sabre_DAV_SimpleCollection instead.
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/)
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- */
-class Sabre_DAV_SimpleDirectory extends Sabre_DAV_SimpleCollection {
-
-}
-
diff --git a/3rdparty/Sabre/DAV/Version.php b/3rdparty/Sabre/DAV/Version.php
index 274646240ab..55611cf2148 100755
--- a/3rdparty/Sabre/DAV/Version.php
+++ b/3rdparty/Sabre/DAV/Version.php
@@ -14,7 +14,7 @@ class Sabre_DAV_Version {
     /**
      * Full version number
      */
-    const VERSION = '1.6.4';
+    const VERSION = '1.7.1';
 
     /**
      * Stability : alpha, beta, stable
diff --git a/3rdparty/Sabre/DAV/XMLUtil.php b/3rdparty/Sabre/DAV/XMLUtil.php
index 60eff3b159a..712fa3fc014 100755
--- a/3rdparty/Sabre/DAV/XMLUtil.php
+++ b/3rdparty/Sabre/DAV/XMLUtil.php
@@ -20,9 +20,6 @@ class Sabre_DAV_XMLUtil {
      * {http://www.example.org}myelem
      *
      * This format is used throughout the SabreDAV sourcecode.
-     * Elements encoded with the urn:DAV namespace will
-     * be returned as if they were in the DAV: namespace. This is to avoid
-     * compatibility problems.
      *
      * This function will return null if a nodetype other than an Element is passed.
      *
@@ -33,8 +30,7 @@ class Sabre_DAV_XMLUtil {
 
         if ($dom->nodeType !== XML_ELEMENT_NODE) return null;
 
-        // Mapping back to the real namespace, in case it was dav
-        if ($dom->namespaceURI=='urn:DAV') $ns = 'DAV:'; else $ns = $dom->namespaceURI;
+        $ns = $dom->namespaceURI;
 
         // Mapping to clark notation
         return '{' . $ns . '}' . $dom->localName;
@@ -65,28 +61,10 @@ class Sabre_DAV_XMLUtil {
     }
 
     /**
-     * This method takes an XML document (as string) and converts all instances of the
-     * DAV: namespace to urn:DAV
-     *
-     * This is unfortunately needed, because the DAV: namespace violates the xml namespaces
-     * spec, and causes the DOM to throw errors
-     *
-     * @param string $xmlDocument
-     * @return array|string|null
-     */
-    static function convertDAVNamespace($xmlDocument) {
-
-        // This is used to map the DAV: namespace to urn:DAV. This is needed, because the DAV:
-        // namespace is actually a violation of the XML namespaces specification, and will cause errors
-        return preg_replace("/xmlns(:[A-Za-z0-9_]*)?=(\"|\')DAV:(\\2)/","xmlns\\1=\\2urn:DAV\\2",$xmlDocument);
-
-    }
-
-    /**
      * This method provides a generic way to load a DOMDocument for WebDAV use.
      *
      * This method throws a Sabre_DAV_Exception_BadRequest exception for any xml errors.
-     * It does not preserve whitespace, and it converts the DAV: namespace to urn:DAV.
+     * It does not preserve whitespace.
      *
      * @param string $xml
      * @throws Sabre_DAV_Exception_BadRequest
@@ -118,10 +96,11 @@ class Sabre_DAV_XMLUtil {
         libxml_clear_errors();
 
         $dom = new DOMDocument();
-        $dom->loadXML(self::convertDAVNamespace($xml),LIBXML_NOWARNING | LIBXML_NOERROR);
 
         // We don't generally care about any whitespace
         $dom->preserveWhiteSpace = false;
+        
+        $dom->loadXML($xml,LIBXML_NOWARNING | LIBXML_NOERROR);
 
         if ($error = libxml_get_last_error()) {
             libxml_clear_errors();
diff --git a/3rdparty/Sabre/DAV/includes.php b/3rdparty/Sabre/DAV/includes.php
index 6a4890677ea..6728f88ce76 100755
--- a/3rdparty/Sabre/DAV/includes.php
+++ b/3rdparty/Sabre/DAV/includes.php
@@ -28,7 +28,7 @@ include __DIR__ . '/Locks/Backend/PDO.php';
 include __DIR__ . '/Locks/LockInfo.php';
 include __DIR__ . '/Node.php';
 include __DIR__ . '/Property/IHref.php';
-include __DIR__ . '/Property.php';
+include __DIR__ . '/PropertyInterface.php';
 include __DIR__ . '/Server.php';
 include __DIR__ . '/ServerPlugin.php';
 include __DIR__ . '/StringUtil.php';
@@ -60,7 +60,7 @@ include __DIR__ . '/Exception/NotFound.php';
 include __DIR__ . '/Exception/NotImplemented.php';
 include __DIR__ . '/Exception/PaymentRequired.php';
 include __DIR__ . '/Exception/PreconditionFailed.php';
-include __DIR__ . '/Exception/ReportNotImplemented.php';
+include __DIR__ . '/Exception/ReportNotSupported.php';
 include __DIR__ . '/Exception/RequestedRangeNotSatisfiable.php';
 include __DIR__ . '/Exception/UnsupportedMediaType.php';
 include __DIR__ . '/FS/Node.php';
@@ -72,18 +72,11 @@ include __DIR__ . '/IQuota.php';
 include __DIR__ . '/Locks/Plugin.php';
 include __DIR__ . '/Mount/Plugin.php';
 include __DIR__ . '/ObjectTree.php';
-include __DIR__ . '/Property/GetLastModified.php';
-include __DIR__ . '/Property/Href.php';
-include __DIR__ . '/Property/HrefList.php';
-include __DIR__ . '/Property/LockDiscovery.php';
-include __DIR__ . '/Property/ResourceType.php';
-include __DIR__ . '/Property/Response.php';
-include __DIR__ . '/Property/ResponseList.php';
-include __DIR__ . '/Property/SupportedLock.php';
-include __DIR__ . '/Property/SupportedReportSet.php';
+include __DIR__ . '/PartialUpdate/IFile.php';
+include __DIR__ . '/PartialUpdate/Plugin.php';
+include __DIR__ . '/Property.php';
 include __DIR__ . '/Tree/Filesystem.php';
 include __DIR__ . '/Collection.php';
-include __DIR__ . '/Directory.php';
 include __DIR__ . '/Exception/ConflictingLock.php';
 include __DIR__ . '/Exception/FileNotFound.php';
 include __DIR__ . '/File.php';
@@ -91,7 +84,15 @@ include __DIR__ . '/FS/Directory.php';
 include __DIR__ . '/FS/File.php';
 include __DIR__ . '/FSExt/Directory.php';
 include __DIR__ . '/FSExt/File.php';
+include __DIR__ . '/Property/GetLastModified.php';
+include __DIR__ . '/Property/Href.php';
+include __DIR__ . '/Property/HrefList.php';
+include __DIR__ . '/Property/LockDiscovery.php';
+include __DIR__ . '/Property/ResourceType.php';
+include __DIR__ . '/Property/Response.php';
+include __DIR__ . '/Property/ResponseList.php';
+include __DIR__ . '/Property/SupportedLock.php';
+include __DIR__ . '/Property/SupportedReportSet.php';
 include __DIR__ . '/SimpleCollection.php';
-include __DIR__ . '/SimpleDirectory.php';
 include __DIR__ . '/SimpleFile.php';
 // End includes
diff --git a/3rdparty/Sabre/DAVACL/AbstractPrincipalCollection.php b/3rdparty/Sabre/DAVACL/AbstractPrincipalCollection.php
index e05b7749805..f67eadad6e9 100755
--- a/3rdparty/Sabre/DAVACL/AbstractPrincipalCollection.php
+++ b/3rdparty/Sabre/DAVACL/AbstractPrincipalCollection.php
@@ -107,7 +107,7 @@ abstract class Sabre_DAVACL_AbstractPrincipalCollection extends Sabre_DAV_Collec
      *
      * @param string $name
      * @throws Sabre_DAV_Exception_NotFound
-     * @return Sabre_DAV_IPrincipal
+     * @return Sabre_DAVACL_IPrincipal
      */
     public function getChild($name) {
 
diff --git a/3rdparty/Sabre/DAVACL/IACL.php b/3rdparty/Sabre/DAVACL/IACL.php
index 003e6993483..356bb481d55 100755
--- a/3rdparty/Sabre/DAVACL/IACL.php
+++ b/3rdparty/Sabre/DAVACL/IACL.php
@@ -48,7 +48,7 @@ interface Sabre_DAVACL_IACL extends Sabre_DAV_INode {
     /**
      * Updates the ACL
      *
-     * This method will receive a list of new ACE's.
+     * This method will receive a list of new ACE's as an array argument.
      *
      * @param array $acl
      * @return void
diff --git a/3rdparty/Sabre/DAVACL/Plugin.php b/3rdparty/Sabre/DAVACL/Plugin.php
index 5c828c6d97b..5b17c838475 100755
--- a/3rdparty/Sabre/DAVACL/Plugin.php
+++ b/3rdparty/Sabre/DAVACL/Plugin.php
@@ -3,7 +3,7 @@
 /**
  * SabreDAV ACL Plugin
  *
- * This plugin provides funcitonality to enforce ACL permissions.
+ * This plugin provides functionality to enforce ACL permissions.
  * ACL is defined in RFC3744.
  *
  * In addition it also provides support for the {DAV:}current-user-principal
@@ -102,11 +102,11 @@ class Sabre_DAVACL_Plugin extends Sabre_DAV_ServerPlugin {
     );
 
     /**
-     * Any principal uri's added here, will automatically be added to the list 
-     * of ACL's. They will effectively receive {DAV:}all privileges, as a 
+     * Any principal uri's added here, will automatically be added to the list
+     * of ACL's. They will effectively receive {DAV:}all privileges, as a
      * protected privilege.
-     * 
-     * @var array 
+     *
+     * @var array
      */
     public $adminPrincipals = array();
 
@@ -233,6 +233,7 @@ class Sabre_DAVACL_Plugin extends Sabre_DAV_ServerPlugin {
 
         $authPlugin = $this->server->getPlugin('auth');
         if (is_null($authPlugin)) return null;
+        /** @var $authPlugin Sabre_DAV_Auth_Plugin */
 
         $userName = $authPlugin->getCurrentUser();
         if (!$userName) return null;
@@ -242,6 +243,14 @@ class Sabre_DAVACL_Plugin extends Sabre_DAV_ServerPlugin {
     }
 
     /**
+     * This array holds a cache for all the principals that are associated with
+     * a single principal.
+     *
+     * @var array
+     */
+    protected $currentUserPrincipalsCache = array();
+
+    /**
      * Returns a list of principals that's associated to the current
      * user, either directly or through group membership.
      *
@@ -253,6 +262,11 @@ class Sabre_DAVACL_Plugin extends Sabre_DAV_ServerPlugin {
 
         if (is_null($currentUser)) return array();
 
+        // First check our cache
+        if (isset($this->currentUserPrincipalsCache[$currentUser])) {
+            return $this->currentUserPrincipalsCache[$currentUser];
+        }
+
         $check = array($currentUser);
         $principals = array($currentUser);
 
@@ -277,6 +291,9 @@ class Sabre_DAVACL_Plugin extends Sabre_DAV_ServerPlugin {
 
         }
 
+        // Store the result in the cache
+        $this->currentUserPrincipalsCache[$currentUser] = $principals;
+
         return $principals;
 
     }
@@ -771,7 +788,7 @@ class Sabre_DAVACL_Plugin extends Sabre_DAV_ServerPlugin {
      * @param array $requestedProperties
      * @param array $returnedProperties
      * @TODO really should be broken into multiple methods, or even a class.
-     * @return void
+     * @return bool
      */
     public function beforeGetProperties($uri, Sabre_DAV_INode $node, &$requestedProperties, &$returnedProperties) {
 
@@ -895,6 +912,18 @@ class Sabre_DAVACL_Plugin extends Sabre_DAV_ServerPlugin {
             $returnedProperties[200]['{DAV:}acl-restrictions'] = new Sabre_DAVACL_Property_AclRestrictions();
         }
 
+        /* Adding ACL properties */
+        if ($node instanceof Sabre_DAVACL_IACL) {
+
+            if (false !== ($index = array_search('{DAV:}owner', $requestedProperties))) {
+
+                unset($requestedProperties[$index]);
+                $returnedProperties[200]['{DAV:}owner'] = new Sabre_DAV_Property_Href($node->getOwner() . '/');
+
+            }
+
+        }
+
     }
 
     /**
@@ -928,6 +957,9 @@ class Sabre_DAVACL_Plugin extends Sabre_DAV_ServerPlugin {
         }
 
         $node->setGroupMemberSet($memberSet);
+        // We must also clear our cache, just in case
+
+        $this->currentUserPrincipalsCache = array();
 
         $result[200]['{DAV:}group-member-set'] = null;
         unset($propertyDelta['{DAV:}group-member-set']);
@@ -935,7 +967,7 @@ class Sabre_DAVACL_Plugin extends Sabre_DAV_ServerPlugin {
     }
 
     /**
-     * This method handels HTTP REPORT requests
+     * This method handles HTTP REPORT requests
      *
      * @param string $reportName
      * @param DOMNode $dom
@@ -1268,10 +1300,12 @@ class Sabre_DAVACL_Plugin extends Sabre_DAV_ServerPlugin {
         }
         $result = $this->principalSearch($searchProperties, $requestedProperties, $uri);
 
-        $xml = $this->server->generateMultiStatus($result);
-        $this->server->httpResponse->setHeader('Content-Type','application/xml; charset=utf-8');
+        $prefer = $this->server->getHTTPPRefer();
+
         $this->server->httpResponse->sendStatus(207);
-        $this->server->httpResponse->sendBody($xml);
+        $this->server->httpResponse->setHeader('Content-Type','application/xml; charset=utf-8');
+        $this->server->httpResponse->setHeader('Vary','Brief,Prefer');
+        $this->server->httpResponse->sendBody($this->server->generateMultiStatus($result, $prefer['return-minimal']));
 
     }
 
diff --git a/3rdparty/Sabre/DAVACL/Property/Acl.php b/3rdparty/Sabre/DAVACL/Property/Acl.php
index 05e1a690b3c..3f79a8d532e 100755
--- a/3rdparty/Sabre/DAVACL/Property/Acl.php
+++ b/3rdparty/Sabre/DAVACL/Property/Acl.php
@@ -88,11 +88,11 @@ class Sabre_DAVACL_Property_Acl extends Sabre_DAV_Property {
     static public function unserialize(DOMElement $dom) {
 
         $privileges = array();
-        $xaces = $dom->getElementsByTagNameNS('urn:DAV','ace');
+        $xaces = $dom->getElementsByTagNameNS('DAV:','ace');
         for($ii=0; $ii < $xaces->length; $ii++) {
 
             $xace = $xaces->item($ii);
-            $principal = $xace->getElementsByTagNameNS('urn:DAV','principal');
+            $principal = $xace->getElementsByTagNameNS('DAV:','principal');
             if ($principal->length !== 1) {
                 throw new Sabre_DAV_Exception_BadRequest('Each {DAV:}ace element must have one {DAV:}principal element');
             }
@@ -116,17 +116,17 @@ class Sabre_DAVACL_Property_Acl extends Sabre_DAV_Property {
 
             $protected = false;
 
-            if ($xace->getElementsByTagNameNS('urn:DAV','protected')->length > 0) {
+            if ($xace->getElementsByTagNameNS('DAV:','protected')->length > 0) {
                 $protected = true;
             }
 
-            $grants = $xace->getElementsByTagNameNS('urn:DAV','grant');
+            $grants = $xace->getElementsByTagNameNS('DAV:','grant');
             if ($grants->length < 1) {
                 throw new Sabre_DAV_Exception_NotImplemented('Every {DAV:}ace element must have a {DAV:}grant element. {DAV:}deny is not yet supported');
             }
             $grant = $grants->item(0);
 
-            $xprivs = $grant->getElementsByTagNameNS('urn:DAV','privilege');
+            $xprivs = $grant->getElementsByTagNameNS('DAV:','privilege');
             for($jj=0; $jj<$xprivs->length; $jj++) {
 
                 $xpriv = $xprivs->item($jj);
diff --git a/3rdparty/Sabre/DAVACL/Property/Principal.php b/3rdparty/Sabre/DAVACL/Property/Principal.php
index c36328a58e0..3f681742276 100755
--- a/3rdparty/Sabre/DAVACL/Property/Principal.php
+++ b/3rdparty/Sabre/DAVACL/Property/Principal.php
@@ -15,7 +15,7 @@
 class Sabre_DAVACL_Property_Principal extends Sabre_DAV_Property implements Sabre_DAV_Property_IHref {
 
     /**
-     * To specify a not-logged-in user, use the UNAUTHENTICTED principal
+     * To specify a not-logged-in user, use the UNAUTHENTICATED principal
      */
     const UNAUTHENTICATED = 1;
 
@@ -131,7 +131,7 @@ class Sabre_DAVACL_Property_Principal extends Sabre_DAV_Property implements Sabr
      * Deserializes a DOM element into a property object.
      *
      * @param DOMElement $dom
-     * @return Sabre_DAV_Property_Principal
+     * @return Sabre_DAVACL_Property_Principal
      */
     static public function unserialize(DOMElement $dom) {
 
diff --git a/3rdparty/Sabre/DAVACL/Version.php b/3rdparty/Sabre/DAVACL/Version.php
index 9950f748741..084a9c13c89 100755
--- a/3rdparty/Sabre/DAVACL/Version.php
+++ b/3rdparty/Sabre/DAVACL/Version.php
@@ -14,7 +14,7 @@ class Sabre_DAVACL_Version {
     /**
      * Full version number
      */
-    const VERSION = '1.6.0';
+    const VERSION = '1.7.0';
 
     /**
      * Stability : alpha, beta, stable
diff --git a/3rdparty/Sabre/HTTP/Request.php b/3rdparty/Sabre/HTTP/Request.php
index 4746ef77704..74d5ed3d7ee 100755
--- a/3rdparty/Sabre/HTTP/Request.php
+++ b/3rdparty/Sabre/HTTP/Request.php
@@ -184,7 +184,7 @@ class Sabre_HTTP_Request {
      * This method returns a readable stream resource.
      * If the asString parameter is set to true, a string is sent instead.
      *
-     * @param bool asString
+     * @param bool $asString
      * @return resource
      */
     public function getBody($asString = false) {
diff --git a/3rdparty/Sabre/HTTP/Response.php b/3rdparty/Sabre/HTTP/Response.php
index ffe9bda2082..9d436881bdf 100755
--- a/3rdparty/Sabre/HTTP/Response.php
+++ b/3rdparty/Sabre/HTTP/Response.php
@@ -4,7 +4,7 @@
  * Sabre_HTTP_Response
  *
  * @package Sabre
- * @subpackage HTTP 
+ * @subpackage HTTP
  * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
@@ -85,6 +85,9 @@ class Sabre_HTTP_Response {
 
     }
 
+    // @codeCoverageIgnoreStart
+    // We cannot reasonably test header() related methods.
+
     /**
      * Sends an HTTP status header to the client
      *
@@ -114,7 +117,9 @@ class Sabre_HTTP_Response {
             return header($name . ': ' . $value, $replace);
         else return false;
 
+
     }
+    // @codeCoverageIgnoreEnd
 
     /**
      * Sets a bunch of HTTP Headers
diff --git a/3rdparty/Sabre/HTTP/Version.php b/3rdparty/Sabre/HTTP/Version.php
index e6b4f7e5358..8ccd7c9edf6 100755
--- a/3rdparty/Sabre/HTTP/Version.php
+++ b/3rdparty/Sabre/HTTP/Version.php
@@ -14,7 +14,7 @@ class Sabre_HTTP_Version {
     /**
      * Full version number
      */
-    const VERSION = '1.6.4';
+    const VERSION = '1.7.0';
 
     /**
      * Stability : alpha, beta, stable
diff --git a/3rdparty/Sabre/VObject/Component.php b/3rdparty/Sabre/VObject/Component.php
deleted file mode 100755
index b78a26133fa..00000000000
--- a/3rdparty/Sabre/VObject/Component.php
+++ /dev/null
@@ -1,365 +0,0 @@
-<?php
-
-/**
- * VObject Component
- *
- * This class represents a VCALENDAR/VCARD component. A component is for example
- * VEVENT, VTODO and also VCALENDAR. It starts with BEGIN:COMPONENTNAME and
- * ends with END:COMPONENTNAME
- *
- * @package Sabre
- * @subpackage VObject
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/)
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- */
-class Sabre_VObject_Component extends Sabre_VObject_Element {
-
-    /**
-     * Name, for example VEVENT
-     *
-     * @var string
-     */
-    public $name;
-
-    /**
-     * Children properties and components
-     *
-     * @var array
-     */
-    public $children = array();
-
-    /**
-     * If coponents are added to this map, they will be automatically mapped
-     * to their respective classes, if parsed by the reader or constructed with
-     * the 'create' method.
-     *
-     * @var array
-     */
-    static public $classMap = array(
-        'VCALENDAR'     => 'Sabre_VObject_Component_VCalendar',
-        'VEVENT'        => 'Sabre_VObject_Component_VEvent',
-        'VTODO'         => 'Sabre_VObject_Component_VTodo',
-        'VJOURNAL'      => 'Sabre_VObject_Component_VJournal',
-        'VALARM'        => 'Sabre_VObject_Component_VAlarm',
-    );
-
-    /**
-     * Creates the new component by name, but in addition will also see if
-     * there's a class mapped to the property name.
-     *
-     * @param string $name
-     * @param string $value
-     * @return Sabre_VObject_Component
-     */
-    static public function create($name, $value = null) {
-
-        $name = strtoupper($name);
-
-        if (isset(self::$classMap[$name])) {
-            return new self::$classMap[$name]($name, $value);
-        } else {
-            return new self($name, $value);
-        }
-
-    }
-
-    /**
-     * Creates a new component.
-     *
-     * By default this object will iterate over its own children, but this can
-     * be overridden with the iterator argument
-     *
-     * @param string $name
-     * @param Sabre_VObject_ElementList $iterator
-     */
-    public function __construct($name, Sabre_VObject_ElementList $iterator = null) {
-
-        $this->name = strtoupper($name);
-        if (!is_null($iterator)) $this->iterator = $iterator;
-
-    }
-
-    /**
-     * Turns the object back into a serialized blob.
-     *
-     * @return string
-     */
-    public function serialize() {
-
-        $str = "BEGIN:" . $this->name . "\r\n";
-
-        /**
-         * Gives a component a 'score' for sorting purposes.
-         *
-         * This is solely used by the childrenSort method.
-         *
-         * A higher score means the item will be higher in the list
-         *
-         * @param Sabre_VObject_Node $n
-         * @return int
-         */
-        $sortScore = function($n) {
-
-            if ($n instanceof Sabre_VObject_Component) {
-                // We want to encode VTIMEZONE first, this is a personal
-                // preference.
-                if ($n->name === 'VTIMEZONE') {
-                    return 1;
-                } else {
-                    return 0;
-                }
-            } else {
-                // VCARD version 4.0 wants the VERSION property to appear first
-                if ($n->name === 'VERSION') {
-                    return 3;
-                } else {
-                    return 2;
-                }
-            }
-
-        };
-
-        usort($this->children, function($a, $b) use ($sortScore) {
-
-            $sA = $sortScore($a);
-            $sB = $sortScore($b);
-
-            if ($sA === $sB) return 0;
-
-            return ($sA > $sB) ? -1 : 1;
-
-        });
-
-        foreach($this->children as $child) $str.=$child->serialize();
-        $str.= "END:" . $this->name . "\r\n";
-
-        return $str;
-
-    }
-
-    /**
-     * Adds a new component or element
-     *
-     * You can call this method with the following syntaxes:
-     *
-     * add(Sabre_VObject_Element $element)
-     * add(string $name, $value)
-     *
-     * The first version adds an Element
-     * The second adds a property as a string.
-     *
-     * @param mixed $item
-     * @param mixed $itemValue
-     * @return void
-     */
-    public function add($item, $itemValue = null) {
-
-        if ($item instanceof Sabre_VObject_Element) {
-            if (!is_null($itemValue)) {
-                throw new InvalidArgumentException('The second argument must not be specified, when passing a VObject');
-            }
-            $item->parent = $this;
-            $this->children[] = $item;
-        } elseif(is_string($item)) {
-
-            if (!is_scalar($itemValue)) {
-                throw new InvalidArgumentException('The second argument must be scalar');
-            }
-            $item = Sabre_VObject_Property::create($item,$itemValue);
-            $item->parent = $this;
-            $this->children[] = $item;
-
-        } else {
-
-            throw new InvalidArgumentException('The first argument must either be a Sabre_VObject_Element or a string');
-
-        }
-
-    }
-
-    /**
-     * Returns an iterable list of children
-     *
-     * @return Sabre_VObject_ElementList
-     */
-    public function children() {
-
-        return new Sabre_VObject_ElementList($this->children);
-
-    }
-
-    /**
-     * Returns an array with elements that match the specified name.
-     *
-     * This function is also aware of MIME-Directory groups (as they appear in
-     * vcards). This means that if a property is grouped as "HOME.EMAIL", it
-     * will also be returned when searching for just "EMAIL". If you want to
-     * search for a property in a specific group, you can select on the entire
-     * string ("HOME.EMAIL"). If you want to search on a specific property that
-     * has not been assigned a group, specify ".EMAIL".
-     *
-     * Keys are retained from the 'children' array, which may be confusing in
-     * certain cases.
-     *
-     * @param string $name
-     * @return array
-     */
-    public function select($name) {
-
-        $group = null;
-        $name = strtoupper($name);
-        if (strpos($name,'.')!==false) {
-            list($group,$name) = explode('.', $name, 2);
-        }
-
-        $result = array();
-        foreach($this->children as $key=>$child) {
-
-            if (
-                strtoupper($child->name) === $name &&
-                (is_null($group) || ( $child instanceof Sabre_VObject_Property && strtoupper($child->group) === $group))
-            ) {
-
-                $result[$key] = $child;
-
-            }
-        }
-
-        reset($result);
-        return $result;
-
-    }
-
-    /**
-     * This method only returns a list of sub-components. Properties are
-     * ignored.
-     *
-     * @return array
-     */
-    public function getComponents() {
-
-        $result = array();
-        foreach($this->children as $child) {
-            if ($child instanceof Sabre_VObject_Component) {
-                $result[] = $child;
-            }
-        }
-
-        return $result;
-
-    }
-
-    /* Magic property accessors {{{ */
-
-    /**
-     * Using 'get' you will either get a property or component,
-     *
-     * If there were no child-elements found with the specified name,
-     * null is returned.
-     *
-     * @param string $name
-     * @return Sabre_VObject_Property
-     */
-    public function __get($name) {
-
-        $matches = $this->select($name);
-        if (count($matches)===0) {
-            return null;
-        } else {
-            $firstMatch = current($matches);
-            /** @var $firstMatch Sabre_VObject_Property */
-            $firstMatch->setIterator(new Sabre_VObject_ElementList(array_values($matches)));
-            return $firstMatch;
-        }
-
-    }
-
-    /**
-     * This method checks if a sub-element with the specified name exists.
-     *
-     * @param string $name
-     * @return bool
-     */
-    public function __isset($name) {
-
-        $matches = $this->select($name);
-        return count($matches)>0;
-
-    }
-
-    /**
-     * Using the setter method you can add properties or subcomponents
-     *
-     * You can either pass a Sabre_VObject_Component, Sabre_VObject_Property
-     * object, or a string to automatically create a Property.
-     *
-     * If the item already exists, it will be removed. If you want to add
-     * a new item with the same name, always use the add() method.
-     *
-     * @param string $name
-     * @param mixed $value
-     * @return void
-     */
-    public function __set($name, $value) {
-
-        $matches = $this->select($name);
-        $overWrite = count($matches)?key($matches):null;
-
-        if ($value instanceof Sabre_VObject_Component || $value instanceof Sabre_VObject_Property) {
-            $value->parent = $this;
-            if (!is_null($overWrite)) {
-                $this->children[$overWrite] = $value;
-            } else {
-                $this->children[] = $value;
-            }
-        } elseif (is_scalar($value)) {
-            $property = Sabre_VObject_Property::create($name,$value);
-            $property->parent = $this;
-            if (!is_null($overWrite)) {
-                $this->children[$overWrite] = $property;
-            } else {
-                $this->children[] = $property;
-            }
-        } else {
-            throw new InvalidArgumentException('You must pass a Sabre_VObject_Component, Sabre_VObject_Property or scalar type');
-        }
-
-    }
-
-    /**
-     * Removes all properties and components within this component.
-     *
-     * @param string $name
-     * @return void
-     */
-    public function __unset($name) {
-
-        $matches = $this->select($name);
-        foreach($matches as $k=>$child) {
-
-            unset($this->children[$k]);
-            $child->parent = null;
-
-        }
-
-    }
-
-    /* }}} */
-
-    /**
-     * This method is automatically called when the object is cloned.
-     * Specifically, this will ensure all child elements are also cloned.
-     *
-     * @return void
-     */
-    public function __clone() {
-
-        foreach($this->children as $key=>$child) {
-            $this->children[$key] = clone $child;
-            $this->children[$key]->parent = $this;
-        }
-
-    }
-
-}
diff --git a/3rdparty/Sabre/VObject/Component/VAlarm.php b/3rdparty/Sabre/VObject/Component/VAlarm.php
deleted file mode 100755
index ebb4a9b18f6..00000000000
--- a/3rdparty/Sabre/VObject/Component/VAlarm.php
+++ /dev/null
@@ -1,102 +0,0 @@
-<?php
-
-/**
- * VAlarm component
- *
- * This component contains some additional functionality specific for VALARMs.
- *
- * @package Sabre
- * @subpackage VObject
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/)
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- */
-class Sabre_VObject_Component_VAlarm extends Sabre_VObject_Component {
-
-    /**
-     * Returns a DateTime object when this alarm is going to trigger.
-     *
-     * This ignores repeated alarm, only the first trigger is returned.
-     *
-     * @return DateTime
-     */
-    public function getEffectiveTriggerTime() {
-
-        $trigger = $this->TRIGGER;
-        if(!isset($trigger['VALUE']) || strtoupper($trigger['VALUE']) === 'DURATION') {
-            $triggerDuration = Sabre_VObject_DateTimeParser::parseDuration($this->TRIGGER);
-            $related = (isset($trigger['RELATED']) && strtoupper($trigger['RELATED']) == 'END') ? 'END' : 'START';
-
-            $parentComponent = $this->parent;
-            if ($related === 'START') {
-                $effectiveTrigger = clone $parentComponent->DTSTART->getDateTime();
-                $effectiveTrigger->add($triggerDuration);
-            } else {
-                if ($parentComponent->name === 'VTODO') {
-                    $endProp = 'DUE';
-                } elseif ($parentComponent->name === 'VEVENT') {
-                    $endProp = 'DTEND';
-                } else {
-                    throw new Sabre_DAV_Exception('time-range filters on VALARM components are only supported when they are a child of VTODO or VEVENT');
-                }
-
-                if (isset($parentComponent->$endProp)) {
-                    $effectiveTrigger = clone $parentComponent->$endProp->getDateTime();
-                    $effectiveTrigger->add($triggerDuration);
-                } elseif (isset($parentComponent->DURATION)) {
-                    $effectiveTrigger = clone $parentComponent->DTSTART->getDateTime();
-                    $duration = Sabre_VObject_DateTimeParser::parseDuration($parentComponent->DURATION);
-                    $effectiveTrigger->add($duration);
-                    $effectiveTrigger->add($triggerDuration);
-                } else {
-                    $effectiveTrigger = clone $parentComponent->DTSTART->getDateTime();
-                    $effectiveTrigger->add($triggerDuration);
-                }
-            }
-        } else {
-            $effectiveTrigger = $trigger->getDateTime();
-        }
-        return $effectiveTrigger;
-
-    }
-
-    /**
-     * Returns true or false depending on if the event falls in the specified
-     * time-range. This is used for filtering purposes.
-     *
-     * The rules used to determine if an event falls within the specified
-     * time-range is based on the CalDAV specification.
-     *
-     * @param DateTime $start
-     * @param DateTime $end
-     * @return bool
-     */
-    public function isInTimeRange(DateTime $start, DateTime $end) {
-
-        $effectiveTrigger = $this->getEffectiveTriggerTime();
-
-        if (isset($this->DURATION)) {
-            $duration = Sabre_VObject_DateTimeParser::parseDuration($this->DURATION);
-            $repeat = (string)$this->repeat;
-            if (!$repeat) {
-                $repeat = 1;
-            }
-
-            $period = new DatePeriod($effectiveTrigger, $duration, (int)$repeat);
-
-            foreach($period as $occurrence) {
-
-                if ($start <= $occurrence && $end > $occurrence) {
-                    return true;
-                }
-            }
-            return false;
-        } else {
-            return ($start <= $effectiveTrigger && $end > $effectiveTrigger);
-        }
-
-    }
-
-}
-
-?>
diff --git a/3rdparty/Sabre/VObject/Component/VCalendar.php b/3rdparty/Sabre/VObject/Component/VCalendar.php
deleted file mode 100755
index f3be29afdbb..00000000000
--- a/3rdparty/Sabre/VObject/Component/VCalendar.php
+++ /dev/null
@@ -1,133 +0,0 @@
-<?php
-
-/**
- * The VCalendar component
- *
- * This component adds functionality to a component, specific for a VCALENDAR.
- * 
- * @package Sabre
- * @subpackage VObject
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/) 
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- */
-class Sabre_VObject_Component_VCalendar extends Sabre_VObject_Component {
-
-    /**
-     * Returns a list of all 'base components'. For instance, if an Event has 
-     * a recurrence rule, and one instance is overridden, the overridden event 
-     * will have the same UID, but will be excluded from this list.
-     *
-     * VTIMEZONE components will always be excluded. 
-     *
-     * @param string $componentName filter by component name 
-     * @return array 
-     */
-    public function getBaseComponents($componentName = null) {
-
-        $components = array();
-        foreach($this->children as $component) {
-
-            if (!$component instanceof Sabre_VObject_Component)
-                continue;
-
-            if (isset($component->{'RECURRENCE-ID'})) 
-                continue;
-
-            if ($componentName && $component->name !== strtoupper($componentName)) 
-                continue;
-
-            if ($component->name === 'VTIMEZONE')
-                continue;
-
-            $components[] = $component;
-
-        }
-
-        return $components;
-
-    }
-
-    /**
-     * If this calendar object, has events with recurrence rules, this method 
-     * can be used to expand the event into multiple sub-events.
-     *
-     * Each event will be stripped from it's recurrence information, and only 
-     * the instances of the event in the specified timerange will be left 
-     * alone.
-     *
-     * In addition, this method will cause timezone information to be stripped, 
-     * and normalized to UTC.
-     *
-     * This method will alter the VCalendar. This cannot be reversed.
-     *
-     * This functionality is specifically used by the CalDAV standard. It is 
-     * possible for clients to request expand events, if they are rather simple 
-     * clients and do not have the possibility to calculate recurrences.
-     *
-     * @param DateTime $start
-     * @param DateTime $end 
-     * @return void
-     */
-    public function expand(DateTime $start, DateTime $end) {
-
-        $newEvents = array();
-
-        foreach($this->select('VEVENT') as $key=>$vevent) {
-
-            if (isset($vevent->{'RECURRENCE-ID'})) {
-                unset($this->children[$key]);
-                continue;
-            } 
-
-
-            if (!$vevent->rrule) {
-                unset($this->children[$key]);
-                if ($vevent->isInTimeRange($start, $end)) {
-                    $newEvents[] = $vevent;
-                }
-                continue;
-            }
-
-            $uid = (string)$vevent->uid;
-            if (!$uid) {
-                throw new LogicException('Event did not have a UID!');
-            }
-
-            $it = new Sabre_VObject_RecurrenceIterator($this, $vevent->uid);
-            $it->fastForward($start);
-
-            while($it->valid() && $it->getDTStart() < $end) {
-
-                if ($it->getDTEnd() > $start) {
-
-                    $newEvents[] = $it->getEventObject();
-
-                }
-                $it->next();
-
-            }
-            unset($this->children[$key]);
-
-        }
-
-        foreach($newEvents as $newEvent) {
-
-            foreach($newEvent->children as $child) {
-                if ($child instanceof Sabre_VObject_Property_DateTime &&
-                    $child->getDateType() == Sabre_VObject_Property_DateTime::LOCALTZ) {
-                        $child->setDateTime($child->getDateTime(),Sabre_VObject_Property_DateTime::UTC);
-                    }
-            }
-
-            $this->add($newEvent);
-
-        }
-
-        // Removing all VTIMEZONE components
-        unset($this->VTIMEZONE);
-
-    } 
-
-}
-
diff --git a/3rdparty/Sabre/VObject/Component/VEvent.php b/3rdparty/Sabre/VObject/Component/VEvent.php
deleted file mode 100755
index d6b910874d0..00000000000
--- a/3rdparty/Sabre/VObject/Component/VEvent.php
+++ /dev/null
@@ -1,71 +0,0 @@
-<?php
-
-/**
- * VEvent component
- *
- * This component contains some additional functionality specific for VEVENT's.
- *
- * @package Sabre
- * @subpackage VObject
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/)
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- */
-class Sabre_VObject_Component_VEvent extends Sabre_VObject_Component {
-
-    /**
-     * Returns true or false depending on if the event falls in the specified
-     * time-range. This is used for filtering purposes.
-     *
-     * The rules used to determine if an event falls within the specified
-     * time-range is based on the CalDAV specification.
-     *
-     * @param DateTime $start
-     * @param DateTime $end
-     * @return bool
-     */
-    public function isInTimeRange(DateTime $start, DateTime $end) {
-
-        if ($this->RRULE) {
-            $it = new Sabre_VObject_RecurrenceIterator($this);
-            $it->fastForward($start);
-
-            // We fast-forwarded to a spot where the end-time of the
-            // recurrence instance exceeded the start of the requested
-            // time-range.
-            //
-            // If the starttime of the recurrence did not exceed the
-            // end of the time range as well, we have a match.
-            return ($it->getDTStart() < $end && $it->getDTEnd() > $start);
-
-        }
-
-        $effectiveStart = $this->DTSTART->getDateTime();
-        if (isset($this->DTEND)) {
-
-            // The DTEND property is considered non inclusive. So for a 3 day
-            // event in july, dtstart and dtend would have to be July 1st and
-            // July 4th respectively.
-            //
-            // See:
-            // http://tools.ietf.org/html/rfc5545#page-54
-            $effectiveEnd = $this->DTEND->getDateTime();
-
-        } elseif (isset($this->DURATION)) {
-            $effectiveEnd = clone $effectiveStart;
-            $effectiveEnd->add( Sabre_VObject_DateTimeParser::parseDuration($this->DURATION) );
-        } elseif ($this->DTSTART->getDateType() == Sabre_VObject_Element_DateTime::DATE) {
-            $effectiveEnd = clone $effectiveStart;
-            $effectiveEnd->modify('+1 day');
-        } else {
-            $effectiveEnd = clone $effectiveStart;
-        }
-        return (
-            ($start <= $effectiveEnd) && ($end > $effectiveStart)
-        );
-
-    }
-
-}
-
-?>
diff --git a/3rdparty/Sabre/VObject/Component/VJournal.php b/3rdparty/Sabre/VObject/Component/VJournal.php
deleted file mode 100755
index 22b3ec921e5..00000000000
--- a/3rdparty/Sabre/VObject/Component/VJournal.php
+++ /dev/null
@@ -1,46 +0,0 @@
-<?php
-
-/**
- * VJournal component
- *
- * This component contains some additional functionality specific for VJOURNALs.
- * 
- * @package Sabre
- * @subpackage VObject
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/) 
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- */
-class Sabre_VObject_Component_VJournal extends Sabre_VObject_Component {
-
-    /**
-     * Returns true or false depending on if the event falls in the specified 
-     * time-range. This is used for filtering purposes. 
-     *
-     * The rules used to determine if an event falls within the specified 
-     * time-range is based on the CalDAV specification.
-     *
-     * @param DateTime $start
-     * @param DateTime $end 
-     * @return bool 
-     */
-    public function isInTimeRange(DateTime $start, DateTime $end) {
-
-        $dtstart = isset($this->DTSTART)?$this->DTSTART->getDateTime():null;
-        if ($dtstart) {
-            $effectiveEnd = clone $dtstart;
-            if ($this->DTSTART->getDateType() == Sabre_VObject_Element_DateTime::DATE) {
-                $effectiveEnd->modify('+1 day');
-            }
-
-            return ($start <= $effectiveEnd && $end > $dtstart);
-
-        }
-        return false;
-
-
-    }
-
-}
-
-?>
diff --git a/3rdparty/Sabre/VObject/Component/VTodo.php b/3rdparty/Sabre/VObject/Component/VTodo.php
deleted file mode 100755
index 79d06298d7f..00000000000
--- a/3rdparty/Sabre/VObject/Component/VTodo.php
+++ /dev/null
@@ -1,68 +0,0 @@
-<?php
-
-/**
- * VTodo component
- *
- * This component contains some additional functionality specific for VTODOs.
- * 
- * @package Sabre
- * @subpackage VObject
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/) 
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- */
-class Sabre_VObject_Component_VTodo extends Sabre_VObject_Component {
-
-    /**
-     * Returns true or false depending on if the event falls in the specified 
-     * time-range. This is used for filtering purposes. 
-     *
-     * The rules used to determine if an event falls within the specified 
-     * time-range is based on the CalDAV specification.
-     *
-     * @param DateTime $start
-     * @param DateTime $end 
-     * @return bool 
-     */
-    public function isInTimeRange(DateTime $start, DateTime $end) {
-
-        $dtstart = isset($this->DTSTART)?$this->DTSTART->getDateTime():null;
-        $duration = isset($this->DURATION)?Sabre_VObject_DateTimeParser::parseDuration($this->DURATION):null;
-        $due = isset($this->DUE)?$this->DUE->getDateTime():null;
-        $completed = isset($this->COMPLETED)?$this->COMPLETED->getDateTime():null;
-        $created = isset($this->CREATED)?$this->CREATED->getDateTime():null;
-
-        if ($dtstart) {
-            if ($duration) {
-                $effectiveEnd = clone $dtstart;
-                $effectiveEnd->add($duration);
-                return $start <= $effectiveEnd && $end > $dtstart;
-            } elseif ($due) {
-                return
-                    ($start < $due || $start <= $dtstart) &&
-                    ($end > $dtstart || $end >= $due);
-            } else {
-                return $start <= $dtstart && $end > $dtstart;
-            }
-        }
-        if ($due) {
-            return ($start < $due && $end >= $due);
-        }
-        if ($completed && $created) {
-            return
-                ($start <= $created || $start <= $completed) &&
-                ($end >= $created || $end >= $completed);
-        }
-        if ($completed) {
-            return ($start <= $completed && $end >= $completed);
-        }
-        if ($created) {
-            return ($end > $created);
-        }
-        return true;
-
-    }
-
-}
-
-?>
diff --git a/3rdparty/Sabre/VObject/DateTimeParser.php b/3rdparty/Sabre/VObject/DateTimeParser.php
deleted file mode 100755
index 23a4bb69916..00000000000
--- a/3rdparty/Sabre/VObject/DateTimeParser.php
+++ /dev/null
@@ -1,181 +0,0 @@
-<?php
-
-/**
- * DateTimeParser
- *
- * This class is responsible for parsing the several different date and time
- * formats iCalendar and vCards have.
- *
- * @package Sabre
- * @subpackage VObject
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/)
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- */
-class Sabre_VObject_DateTimeParser {
-
-    /**
-     * Parses an iCalendar (rfc5545) formatted datetime and returns a DateTime object
-     *
-     * Specifying a reference timezone is optional. It will only be used
-     * if the non-UTC format is used. The argument is used as a reference, the
-     * returned DateTime object will still be in the UTC timezone.
-     *
-     * @param string $dt
-     * @param DateTimeZone $tz
-     * @return DateTime
-     */
-    static public function parseDateTime($dt,DateTimeZone $tz = null) {
-
-        // Format is YYYYMMDD + "T" + hhmmss
-        $result = preg_match('/^([1-3][0-9]{3})([0-1][0-9])([0-3][0-9])T([0-2][0-9])([0-5][0-9])([0-5][0-9])([Z]?)$/',$dt,$matches);
-
-        if (!$result) {
-            throw new Sabre_DAV_Exception_BadRequest('The supplied iCalendar datetime value is incorrect: ' . $dt);
-        }
-
-        if ($matches[7]==='Z' || is_null($tz)) {
-            $tz = new DateTimeZone('UTC');
-        }
-        $date = new DateTime($matches[1] . '-' . $matches[2] . '-' . $matches[3] . ' ' . $matches[4] . ':' . $matches[5] .':' . $matches[6], $tz);
-
-        // Still resetting the timezone, to normalize everything to UTC
-        $date->setTimeZone(new DateTimeZone('UTC'));
-        return $date;
-
-    }
-
-    /**
-     * Parses an iCalendar (rfc5545) formatted date and returns a DateTime object
-     *
-     * @param string $date
-     * @return DateTime
-     */
-    static public function parseDate($date) {
-
-        // Format is YYYYMMDD
-        $result = preg_match('/^([1-3][0-9]{3})([0-1][0-9])([0-3][0-9])$/',$date,$matches);
-
-        if (!$result) {
-            throw new Sabre_DAV_Exception_BadRequest('The supplied iCalendar date value is incorrect: ' . $date);
-        }
-
-        $date = new DateTime($matches[1] . '-' . $matches[2] . '-' . $matches[3], new DateTimeZone('UTC'));
-        return $date;
-
-    }
-
-    /**
-     * Parses an iCalendar (RFC5545) formatted duration value.
-     *
-     * This method will either return a DateTimeInterval object, or a string
-     * suitable for strtotime or DateTime::modify.
-     *
-     * @param string $duration
-     * @param bool $asString
-     * @return DateInterval|string
-     */
-    static public function parseDuration($duration, $asString = false) {
-
-        $result = preg_match('/^(?P<plusminus>\+|-)?P((?P<week>\d+)W)?((?P<day>\d+)D)?(T((?P<hour>\d+)H)?((?P<minute>\d+)M)?((?P<second>\d+)S)?)?$/', $duration, $matches);
-        if (!$result) {
-            throw new Sabre_DAV_Exception_BadRequest('The supplied iCalendar duration value is incorrect: ' . $duration);
-        }
-
-        if (!$asString) {
-            $invert = false;
-            if ($matches['plusminus']==='-') {
-                $invert = true;
-            }
-
-
-            $parts = array(
-                'week',
-                'day',
-                'hour',
-                'minute',
-                'second',
-            );
-            foreach($parts as $part) {
-                $matches[$part] = isset($matches[$part])&&$matches[$part]?(int)$matches[$part]:0;
-            }
-
-
-            // We need to re-construct the $duration string, because weeks and
-            // days are not supported by DateInterval in the same string.
-            $duration = 'P';
-            $days = $matches['day'];
-            if ($matches['week']) {
-                $days+=$matches['week']*7;
-            }
-            if ($days)
-                $duration.=$days . 'D';
-
-            if ($matches['minute'] || $matches['second'] || $matches['hour']) {
-                $duration.='T';
-
-                if ($matches['hour'])
-                    $duration.=$matches['hour'].'H';
-
-                if ($matches['minute'])
-                    $duration.=$matches['minute'].'M';
-
-                if ($matches['second'])
-                    $duration.=$matches['second'].'S';
-
-            }
-
-            if ($duration==='P') {
-                $duration = 'PT0S';
-            }
-            $iv = new DateInterval($duration);
-            if ($invert) $iv->invert = true;
-
-            return $iv;
-
-        }
-
-
-
-        $parts = array(
-            'week',
-            'day',
-            'hour',
-            'minute',
-            'second',
-        );
-
-        $newDur = '';
-        foreach($parts as $part) {
-            if (isset($matches[$part]) && $matches[$part]) {
-                $newDur.=' '.$matches[$part] . ' ' . $part . 's';
-            }
-        }
-
-        $newDur = ($matches['plusminus']==='-'?'-':'+') . trim($newDur);
-        if ($newDur === '+') { $newDur = '+0 seconds'; };
-        return $newDur;
-
-    }
-
-    /**
-     * Parses either a Date or DateTime, or Duration value.
-     *
-     * @param string $date
-     * @param DateTimeZone|string $referenceTZ
-     * @return DateTime|DateInterval
-     */
-    static public function parse($date, $referenceTZ = null) {
-
-        if ($date[0]==='P' || ($date[0]==='-' && $date[1]==='P')) {
-            return self::parseDuration($date);
-        } elseif (strlen($date)===8) {
-            return self::parseDate($date);
-        } else {
-            return self::parseDateTime($date, $referenceTZ);
-        }
-
-    }
-
-
-}
diff --git a/3rdparty/Sabre/VObject/Element.php b/3rdparty/Sabre/VObject/Element.php
deleted file mode 100755
index e20ff0b353c..00000000000
--- a/3rdparty/Sabre/VObject/Element.php
+++ /dev/null
@@ -1,16 +0,0 @@
-<?php
-
-/**
- * Base class for all elements
- *
- * @package Sabre
- * @subpackage VObject
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/)
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- */
-abstract class Sabre_VObject_Element extends Sabre_VObject_Node {
-
-    public $parent = null;
-
-}
diff --git a/3rdparty/Sabre/VObject/Element/DateTime.php b/3rdparty/Sabre/VObject/Element/DateTime.php
deleted file mode 100755
index 5e5eb7ab6f2..00000000000
--- a/3rdparty/Sabre/VObject/Element/DateTime.php
+++ /dev/null
@@ -1,37 +0,0 @@
-<?php
-
-/**
- * DateTime property
- *
- * this class got renamed to Sabre_VObject_Property_DateTime
- *
- * @package Sabre
- * @subpackage VObject
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/)
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- * @deprecated
- */
-class Sabre_VObject_Element_DateTime extends Sabre_VObject_Property_DateTime {
-
-    /**
-     * Local 'floating' time
-     */
-    const LOCAL = 1;
-
-    /**
-     * UTC-based time
-     */
-    const UTC = 2;
-
-    /**
-     * Local time plus timezone
-     */
-    const LOCALTZ = 3;
-
-    /**
-     * Only a date, time is ignored
-     */
-    const DATE = 4;
-
-}
diff --git a/3rdparty/Sabre/VObject/Element/MultiDateTime.php b/3rdparty/Sabre/VObject/Element/MultiDateTime.php
deleted file mode 100755
index 8a12ced94a8..00000000000
--- a/3rdparty/Sabre/VObject/Element/MultiDateTime.php
+++ /dev/null
@@ -1,17 +0,0 @@
-<?php
-
-/**
- * Multi-DateTime property
- *
- * This class got renamed to Sabre_VObject_Property_MultiDateTime
- *
- * @package Sabre
- * @subpackage VObject
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/)
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- * @deprecated
- */
-class Sabre_VObject_Element_MultiDateTime extends Sabre_VObject_Property_MultiDateTime {
-
-}
diff --git a/3rdparty/Sabre/VObject/ElementList.php b/3rdparty/Sabre/VObject/ElementList.php
deleted file mode 100755
index 7e508db20f0..00000000000
--- a/3rdparty/Sabre/VObject/ElementList.php
+++ /dev/null
@@ -1,172 +0,0 @@
-<?php
-
-/**
- * VObject ElementList
- *
- * This class represents a list of elements. Lists are the result of queries,
- * such as doing $vcalendar->vevent where there's multiple VEVENT objects.
- *
- * @package Sabre
- * @subpackage VObject
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/)
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- */
-class Sabre_VObject_ElementList implements Iterator, Countable, ArrayAccess {
-
-    /**
-     * Inner elements
-     *
-     * @var array
-     */
-    protected $elements = array();
-
-    /**
-     * Creates the element list.
-     *
-     * @param array $elements
-     */
-    public function __construct(array $elements) {
-
-        $this->elements = $elements;
-
-    }
-
-    /* {{{ Iterator interface */
-
-    /**
-     * Current position
-     *
-     * @var int
-     */
-    private $key = 0;
-
-    /**
-     * Returns current item in iteration
-     *
-     * @return Sabre_VObject_Element
-     */
-    public function current() {
-
-        return $this->elements[$this->key];
-
-    }
-
-    /**
-     * To the next item in the iterator
-     *
-     * @return void
-     */
-    public function next() {
-
-        $this->key++;
-
-    }
-
-    /**
-     * Returns the current iterator key
-     *
-     * @return int
-     */
-    public function key() {
-
-        return $this->key;
-
-    }
-
-    /**
-     * Returns true if the current position in the iterator is a valid one
-     *
-     * @return bool
-     */
-    public function valid() {
-
-        return isset($this->elements[$this->key]);
-
-    }
-
-    /**
-     * Rewinds the iterator
-     *
-     * @return void
-     */
-    public function rewind() {
-
-        $this->key = 0;
-
-    }
-
-    /* }}} */
-
-    /* {{{ Countable interface */
-
-    /**
-     * Returns the number of elements
-     *
-     * @return int
-     */
-    public function count() {
-
-        return count($this->elements);
-
-    }
-
-    /* }}} */
-
-    /* {{{ ArrayAccess Interface */
-
-
-    /**
-     * Checks if an item exists through ArrayAccess.
-     *
-     * @param int $offset
-     * @return bool
-     */
-    public function offsetExists($offset) {
-
-        return isset($this->elements[$offset]);
-
-    }
-
-    /**
-     * Gets an item through ArrayAccess.
-     *
-     * @param int $offset
-     * @return mixed
-     */
-    public function offsetGet($offset) {
-
-        return $this->elements[$offset];
-
-    }
-
-    /**
-     * Sets an item through ArrayAccess.
-     *
-     * @param int $offset
-     * @param mixed $value
-     * @return void
-     */
-    public function offsetSet($offset,$value) {
-
-        throw new LogicException('You can not add new objects to an ElementList');
-
-    }
-
-    /**
-     * Sets an item through ArrayAccess.
-     *
-     * This method just forwards the request to the inner iterator
-     *
-     * @param int $offset
-     * @return void
-     */
-    public function offsetUnset($offset) {
-
-        throw new LogicException('You can not remove objects from an ElementList');
-
-    }
-
-    /* }}} */
-
-}
diff --git a/3rdparty/Sabre/VObject/FreeBusyGenerator.php b/3rdparty/Sabre/VObject/FreeBusyGenerator.php
deleted file mode 100755
index 1c96a64a004..00000000000
--- a/3rdparty/Sabre/VObject/FreeBusyGenerator.php
+++ /dev/null
@@ -1,297 +0,0 @@
-<?php
-
-/**
- * This class helps with generating FREEBUSY reports based on existing sets of
- * objects.
- *
- * It only looks at VEVENT and VFREEBUSY objects from the sourcedata, and
- * generates a single VFREEBUSY object.
- *
- * VFREEBUSY components are described in RFC5545, The rules for what should
- * go in a single freebusy report is taken from RFC4791, section 7.10.
- *
- * @package Sabre
- * @subpackage VObject
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/)
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- */
-class Sabre_VObject_FreeBusyGenerator {
-
-    /**
-     * Input objects
-     *
-     * @var array
-     */
-    protected $objects;
-
-    /**
-     * Start of range
-     *
-     * @var DateTime|null
-     */
-    protected $start;
-
-    /**
-     * End of range
-     *
-     * @var DateTime|null
-     */
-    protected $end;
-
-    /**
-     * VCALENDAR object
-     *
-     * @var Sabre_VObject_Component
-     */
-    protected $baseObject;
-
-    /**
-     * Sets the VCALENDAR object.
-     *
-     * If this is set, it will not be generated for you. You are responsible
-     * for setting things like the METHOD, CALSCALE, VERSION, etc..
-     *
-     * The VFREEBUSY object will be automatically added though.
-     *
-     * @param Sabre_VObject_Component $vcalendar
-     * @return void
-     */
-    public function setBaseObject(Sabre_VObject_Component $vcalendar) {
-
-        $this->baseObject = $vcalendar;
-
-    }
-
-    /**
-     * Sets the input objects
-     *
-     * Every object must either be a string or a Sabre_VObject_Component.
-     *
-     * @param array $objects
-     * @return void
-     */
-    public function setObjects(array $objects) {
-
-        $this->objects = array();
-        foreach($objects as $object) {
-
-            if (is_string($object)) {
-                $this->objects[] = Sabre_VObject_Reader::read($object);
-            } elseif ($object instanceof Sabre_VObject_Component) {
-                $this->objects[] = $object;
-            } else {
-                throw new InvalidArgumentException('You can only pass strings or Sabre_VObject_Component arguments to setObjects');
-            }
-
-        }
-
-    }
-
-    /**
-     * Sets the time range
-     *
-     * Any freebusy object falling outside of this time range will be ignored.
-     *
-     * @param DateTime $start
-     * @param DateTime $end
-     * @return void
-     */
-    public function setTimeRange(DateTime $start = null, DateTime $end = null) {
-
-        $this->start = $start;
-        $this->end = $end;
-
-    }
-
-    /**
-     * Parses the input data and returns a correct VFREEBUSY object, wrapped in
-     * a VCALENDAR.
-     *
-     * @return Sabre_VObject_Component
-     */
-    public function getResult() {
-
-        $busyTimes = array();
-
-        foreach($this->objects as $object) {
-
-            foreach($object->getBaseComponents() as $component) {
-
-                switch($component->name) {
-
-                    case 'VEVENT' :
-
-                        $FBTYPE = 'BUSY';
-                        if (isset($component->TRANSP) && (strtoupper($component->TRANSP) === 'TRANSPARENT')) {
-                            break;
-                        }
-                        if (isset($component->STATUS)) {
-                            $status = strtoupper($component->STATUS);
-                            if ($status==='CANCELLED') {
-                                break;
-                            }
-                            if ($status==='TENTATIVE') {
-                                $FBTYPE = 'BUSY-TENTATIVE';
-                            }
-                        }
-
-                        $times = array();
-
-                        if ($component->RRULE) {
-
-                            $iterator = new Sabre_VObject_RecurrenceIterator($object, (string)$component->uid);
-                            if ($this->start) {
-                                $iterator->fastForward($this->start);
-                            }
-
-                            $maxRecurrences = 200;
-
-                            while($iterator->valid() && --$maxRecurrences) {
-
-                                $startTime = $iterator->getDTStart();
-                                if ($this->end && $startTime > $this->end) {
-                                    break;
-                                }
-                                $times[] = array(
-                                    $iterator->getDTStart(),
-                                    $iterator->getDTEnd(),
-                                );
-
-                                $iterator->next();
-
-                            }
-
-                        } else {
-
-                            $startTime = $component->DTSTART->getDateTime();
-                            if ($this->end && $startTime > $this->end) {
-                                break;
-                            }
-                            $endTime = null;
-                            if (isset($component->DTEND)) {
-                                $endTime = $component->DTEND->getDateTime();
-                            } elseif (isset($component->DURATION)) {
-                                $duration = Sabre_VObject_DateTimeParser::parseDuration((string)$component->DURATION);
-                                $endTime = clone $startTime;
-                                $endTime->add($duration);
-                            } elseif ($component->DTSTART->getDateType() === Sabre_VObject_Property_DateTime::DATE) {
-                                $endTime = clone $startTime;
-                                $endTime->modify('+1 day');
-                            } else {
-                                // The event had no duration (0 seconds)
-                                break;
-                            }
-
-                            $times[] = array($startTime, $endTime);
-
-                        }
-
-                        foreach($times as $time) {
-
-                            if ($this->end && $time[0] > $this->end) break;
-                            if ($this->start && $time[1] < $this->start) break;
-
-                            $busyTimes[] = array(
-                                $time[0],
-                                $time[1],
-                                $FBTYPE,
-                            );
-                        }
-                        break;
-
-                    case 'VFREEBUSY' :
-                        foreach($component->FREEBUSY as $freebusy) {
-
-                            $fbType = isset($freebusy['FBTYPE'])?strtoupper($freebusy['FBTYPE']):'BUSY';
-
-                            // Skipping intervals marked as 'free'
-                            if ($fbType==='FREE')
-                                continue;
-
-                            $values = explode(',', $freebusy);
-                            foreach($values as $value) {
-                                list($startTime, $endTime) = explode('/', $value);
-                                $startTime = Sabre_VObject_DateTimeParser::parseDateTime($startTime);
-
-                                if (substr($endTime,0,1)==='P' || substr($endTime,0,2)==='-P') {
-                                    $duration = Sabre_VObject_DateTimeParser::parseDuration($endTime);
-                                    $endTime = clone $startTime;
-                                    $endTime->add($duration);
-                                } else {
-                                    $endTime = Sabre_VObject_DateTimeParser::parseDateTime($endTime);
-                                }
-
-                                if($this->start && $this->start > $endTime) continue;
-                                if($this->end && $this->end < $startTime) continue;
-                                $busyTimes[] = array(
-                                    $startTime,
-                                    $endTime,
-                                    $fbType
-                                );
-
-                            }
-
-
-                        }
-                        break;
-
-
-
-                }
-
-
-            }
-
-        }
-
-        if ($this->baseObject) {
-            $calendar = $this->baseObject;
-        } else {
-            $calendar = new Sabre_VObject_Component('VCALENDAR');
-            $calendar->version = '2.0';
-            if (Sabre_DAV_Server::$exposeVersion) {
-                $calendar->prodid = '-//SabreDAV//Sabre VObject ' . Sabre_VObject_Version::VERSION . '//EN';
-            } else {
-                $calendar->prodid = '-//SabreDAV//Sabre VObject//EN';
-            }
-            $calendar->calscale = 'GREGORIAN';
-        }
-
-        $vfreebusy = new Sabre_VObject_Component('VFREEBUSY');
-        $calendar->add($vfreebusy);
-
-        if ($this->start) {
-            $dtstart = new Sabre_VObject_Property_DateTime('DTSTART');
-            $dtstart->setDateTime($this->start,Sabre_VObject_Property_DateTime::UTC);
-            $vfreebusy->add($dtstart);
-        }
-        if ($this->end) {
-            $dtend = new Sabre_VObject_Property_DateTime('DTEND');
-            $dtend->setDateTime($this->start,Sabre_VObject_Property_DateTime::UTC);
-            $vfreebusy->add($dtend);
-        }
-        $dtstamp = new Sabre_VObject_Property_DateTime('DTSTAMP');
-        $dtstamp->setDateTime(new DateTime('now'), Sabre_VObject_Property_DateTime::UTC);
-        $vfreebusy->add($dtstamp);
-
-        foreach($busyTimes as $busyTime) {
-
-            $busyTime[0]->setTimeZone(new DateTimeZone('UTC'));
-            $busyTime[1]->setTimeZone(new DateTimeZone('UTC'));
-
-            $prop = new Sabre_VObject_Property(
-                'FREEBUSY',
-                $busyTime[0]->format('Ymd\\THis\\Z') . '/' . $busyTime[1]->format('Ymd\\THis\\Z')
-            );
-            $prop['FBTYPE'] = $busyTime[2];
-            $vfreebusy->add($prop);
-
-        }
-
-        return $calendar;
-
-    }
-
-}
-
diff --git a/3rdparty/Sabre/VObject/Node.php b/3rdparty/Sabre/VObject/Node.php
deleted file mode 100755
index d89e01b56c6..00000000000
--- a/3rdparty/Sabre/VObject/Node.php
+++ /dev/null
@@ -1,149 +0,0 @@
-<?php
-
-/**
- * Base class for all nodes
- *
- * @package Sabre
- * @subpackage VObject
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/)
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- */
-abstract class Sabre_VObject_Node implements IteratorAggregate, ArrayAccess, Countable {
-
-    /**
-     * Turns the object back into a serialized blob.
-     *
-     * @return string
-     */
-    abstract function serialize();
-
-    /**
-     * Iterator override
-     *
-     * @var Sabre_VObject_ElementList
-     */
-    protected $iterator = null;
-
-    /**
-     * A link to the parent node
-     *
-     * @var Sabre_VObject_Node
-     */
-    public $parent = null;
-
-    /* {{{ IteratorAggregator interface */
-
-    /**
-     * Returns the iterator for this object
-     *
-     * @return Sabre_VObject_ElementList
-     */
-    public function getIterator() {
-
-        if (!is_null($this->iterator))
-            return $this->iterator;
-
-        return new Sabre_VObject_ElementList(array($this));
-
-    }
-
-    /**
-     * Sets the overridden iterator
-     *
-     * Note that this is not actually part of the iterator interface
-     *
-     * @param Sabre_VObject_ElementList $iterator
-     * @return void
-     */
-    public function setIterator(Sabre_VObject_ElementList $iterator) {
-
-        $this->iterator = $iterator;
-
-    }
-
-    /* }}} */
-
-    /* {{{ Countable interface */
-
-    /**
-     * Returns the number of elements
-     *
-     * @return int
-     */
-    public function count() {
-
-        $it = $this->getIterator();
-        return $it->count();
-
-    }
-
-    /* }}} */
-
-    /* {{{ ArrayAccess Interface */
-
-
-    /**
-     * Checks if an item exists through ArrayAccess.
-     *
-     * This method just forwards the request to the inner iterator
-     *
-     * @param int $offset
-     * @return bool
-     */
-    public function offsetExists($offset) {
-
-        $iterator = $this->getIterator();
-        return $iterator->offsetExists($offset);
-
-    }
-
-    /**
-     * Gets an item through ArrayAccess.
-     *
-     * This method just forwards the request to the inner iterator
-     *
-     * @param int $offset
-     * @return mixed
-     */
-    public function offsetGet($offset) {
-
-        $iterator = $this->getIterator();
-        return $iterator->offsetGet($offset);
-
-    }
-
-    /**
-     * Sets an item through ArrayAccess.
-     *
-     * This method just forwards the request to the inner iterator
-     *
-     * @param int $offset
-     * @param mixed $value
-     * @return void
-     */
-    public function offsetSet($offset,$value) {
-
-        $iterator = $this->getIterator();
-        return $iterator->offsetSet($offset,$value);
-
-    }
-
-    /**
-     * Sets an item through ArrayAccess.
-     *
-     * This method just forwards the request to the inner iterator
-     *
-     * @param int $offset
-     * @return void
-     */
-    public function offsetUnset($offset) {
-
-        $iterator = $this->getIterator();
-        return $iterator->offsetUnset($offset);
-
-    }
-
-    /* }}} */
-
-}
diff --git a/3rdparty/Sabre/VObject/Parameter.php b/3rdparty/Sabre/VObject/Parameter.php
deleted file mode 100755
index 2e39af5f78a..00000000000
--- a/3rdparty/Sabre/VObject/Parameter.php
+++ /dev/null
@@ -1,84 +0,0 @@
-<?php
-
-/**
- * VObject Parameter
- *
- * This class represents a parameter. A parameter is always tied to a property.
- * In the case of:
- *   DTSTART;VALUE=DATE:20101108
- * VALUE=DATE would be the parameter name and value.
- *
- * @package Sabre
- * @subpackage VObject
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/)
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- */
-class Sabre_VObject_Parameter extends Sabre_VObject_Node {
-
-    /**
-     * Parameter name
-     *
-     * @var string
-     */
-    public $name;
-
-    /**
-     * Parameter value
-     *
-     * @var string
-     */
-    public $value;
-
-    /**
-     * Sets up the object
-     *
-     * @param string $name
-     * @param string $value
-     */
-    public function __construct($name, $value = null) {
-
-        $this->name = strtoupper($name);
-        $this->value = $value;
-
-    }
-
-    /**
-     * Turns the object back into a serialized blob.
-     *
-     * @return string
-     */
-    public function serialize() {
-
-        if (is_null($this->value)) {
-            return $this->name;
-        }
-        $src = array(
-            '\\',
-            "\n",
-            ';',
-            ',',
-        );
-        $out = array(
-            '\\\\',
-            '\n',
-            '\;',
-            '\,',
-        );
-
-        return $this->name . '=' . str_replace($src, $out, $this->value);
-
-    }
-
-    /**
-     * Called when this object is being cast to a string
-     *
-     * @return string
-     */
-    public function __toString() {
-
-        return $this->value;
-
-    }
-
-}
diff --git a/3rdparty/Sabre/VObject/ParseException.php b/3rdparty/Sabre/VObject/ParseException.php
deleted file mode 100755
index 1b5e95bf16e..00000000000
--- a/3rdparty/Sabre/VObject/ParseException.php
+++ /dev/null
@@ -1,12 +0,0 @@
-<?php
-
-/**
- * Exception thrown by Sabre_VObject_Reader if an invalid object was attempted to be parsed.
- *
- * @package Sabre
- * @subpackage VObject
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/)
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- */
-class Sabre_VObject_ParseException extends Exception { }
diff --git a/3rdparty/Sabre/VObject/Property.php b/3rdparty/Sabre/VObject/Property.php
deleted file mode 100755
index ce74fe3865b..00000000000
--- a/3rdparty/Sabre/VObject/Property.php
+++ /dev/null
@@ -1,348 +0,0 @@
-<?php
-
-/**
- * VObject Property
- *
- * A property in VObject is usually in the form PARAMNAME:paramValue.
- * An example is : SUMMARY:Weekly meeting
- *
- * Properties can also have parameters:
- * SUMMARY;LANG=en:Weekly meeting.
- *
- * Parameters can be accessed using the ArrayAccess interface.
- *
- * @package Sabre
- * @subpackage VObject
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/)
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- */
-class Sabre_VObject_Property extends Sabre_VObject_Element {
-
-    /**
-     * Propertyname
-     *
-     * @var string
-     */
-    public $name;
-
-    /**
-     * Group name
-     *
-     * This may be something like 'HOME' for vcards.
-     *
-     * @var string
-     */
-    public $group;
-
-    /**
-     * Property parameters
-     *
-     * @var array
-     */
-    public $parameters = array();
-
-    /**
-     * Property value
-     *
-     * @var string
-     */
-    public $value;
-
-    /**
-     * If properties are added to this map, they will be automatically mapped
-     * to their respective classes, if parsed by the reader or constructed with
-     * the 'create' method.
-     *
-     * @var array
-     */
-    static public $classMap = array(
-        'COMPLETED'     => 'Sabre_VObject_Property_DateTime',
-        'CREATED'       => 'Sabre_VObject_Property_DateTime',
-        'DTEND'         => 'Sabre_VObject_Property_DateTime',
-        'DTSTAMP'       => 'Sabre_VObject_Property_DateTime',
-        'DTSTART'       => 'Sabre_VObject_Property_DateTime',
-        'DUE'           => 'Sabre_VObject_Property_DateTime',
-        'EXDATE'        => 'Sabre_VObject_Property_MultiDateTime',
-        'LAST-MODIFIED' => 'Sabre_VObject_Property_DateTime',
-        'RECURRENCE-ID' => 'Sabre_VObject_Property_DateTime',
-        'TRIGGER'       => 'Sabre_VObject_Property_DateTime',
-    );
-
-    /**
-     * Creates the new property by name, but in addition will also see if
-     * there's a class mapped to the property name.
-     *
-     * @param string $name
-     * @param string $value
-     * @return void
-     */
-    static public function create($name, $value = null) {
-
-        $name = strtoupper($name);
-        $shortName = $name;
-        $group = null;
-        if (strpos($shortName,'.')!==false) {
-            list($group, $shortName) = explode('.', $shortName);
-        }
-
-        if (isset(self::$classMap[$shortName])) {
-            return new self::$classMap[$shortName]($name, $value);
-        } else {
-            return new self($name, $value);
-        }
-
-    }
-
-    /**
-     * Creates a new property object
-     *
-     * By default this object will iterate over its own children, but this can
-     * be overridden with the iterator argument
-     *
-     * @param string $name
-     * @param string $value
-     * @param Sabre_VObject_ElementList $iterator
-     */
-    public function __construct($name, $value = null, $iterator = null) {
-
-        $name = strtoupper($name);
-        $group = null;
-        if (strpos($name,'.')!==false) {
-            list($group, $name) = explode('.', $name);
-        }
-        $this->name = $name;
-        $this->group = $group;
-        if (!is_null($iterator)) $this->iterator = $iterator;
-        $this->setValue($value);
-
-    }
-
-
-
-    /**
-     * Updates the internal value
-     *
-     * @param string $value
-     * @return void
-     */
-    public function setValue($value) {
-
-        $this->value = $value;
-
-    }
-
-    /**
-     * Turns the object back into a serialized blob.
-     *
-     * @return string
-     */
-    public function serialize() {
-
-        $str = $this->name;
-        if ($this->group) $str = $this->group . '.' . $this->name;
-
-        if (count($this->parameters)) {
-            foreach($this->parameters as $param) {
-
-                $str.=';' . $param->serialize();
-
-            }
-        }
-        $src = array(
-            '\\',
-            "\n",
-        );
-        $out = array(
-            '\\\\',
-            '\n',
-        );
-        $str.=':' . str_replace($src, $out, $this->value);
-
-        $out = '';
-        while(strlen($str)>0) {
-            if (strlen($str)>75) {
-                $out.= mb_strcut($str,0,75,'utf-8') . "\r\n";
-                $str = ' ' . mb_strcut($str,75,strlen($str),'utf-8');
-            } else {
-                $out.=$str . "\r\n";
-                $str='';
-                break;
-            }
-        }
-
-        return $out;
-
-    }
-
-    /**
-     * Adds a new componenten or element
-     *
-     * You can call this method with the following syntaxes:
-     *
-     * add(Sabre_VObject_Parameter $element)
-     * add(string $name, $value)
-     *
-     * The first version adds an Parameter
-     * The second adds a property as a string.
-     *
-     * @param mixed $item
-     * @param mixed $itemValue
-     * @return void
-     */
-    public function add($item, $itemValue = null) {
-
-        if ($item instanceof Sabre_VObject_Parameter) {
-            if (!is_null($itemValue)) {
-                throw new InvalidArgumentException('The second argument must not be specified, when passing a VObject');
-            }
-            $item->parent = $this;
-            $this->parameters[] = $item;
-        } elseif(is_string($item)) {
-
-            if (!is_scalar($itemValue) && !is_null($itemValue)) {
-                throw new InvalidArgumentException('The second argument must be scalar');
-            }
-            $parameter = new Sabre_VObject_Parameter($item,$itemValue);
-            $parameter->parent = $this;
-            $this->parameters[] = $parameter;
-
-        } else {
-
-            throw new InvalidArgumentException('The first argument must either be a Sabre_VObject_Element or a string');
-
-        }
-
-    }
-
-    /* ArrayAccess interface {{{ */
-
-    /**
-     * Checks if an array element exists
-     *
-     * @param mixed $name
-     * @return bool
-     */
-    public function offsetExists($name) {
-
-        if (is_int($name)) return parent::offsetExists($name);
-
-        $name = strtoupper($name);
-
-        foreach($this->parameters as $parameter) {
-            if ($parameter->name == $name) return true;
-        }
-        return false;
-
-    }
-
-    /**
-     * Returns a parameter, or parameter list.
-     *
-     * @param string $name
-     * @return Sabre_VObject_Element
-     */
-    public function offsetGet($name) {
-
-        if (is_int($name)) return parent::offsetGet($name);
-        $name = strtoupper($name);
-
-        $result = array();
-        foreach($this->parameters as $parameter) {
-            if ($parameter->name == $name)
-                $result[] = $parameter;
-        }
-
-        if (count($result)===0) {
-            return null;
-        } elseif (count($result)===1) {
-            return $result[0];
-        } else {
-            $result[0]->setIterator(new Sabre_VObject_ElementList($result));
-            return $result[0];
-        }
-
-    }
-
-    /**
-     * Creates a new parameter
-     *
-     * @param string $name
-     * @param mixed $value
-     * @return void
-     */
-    public function offsetSet($name, $value) {
-
-        if (is_int($name)) return parent::offsetSet($name, $value);
-
-        if (is_scalar($value)) {
-            if (!is_string($name))
-                throw new InvalidArgumentException('A parameter name must be specified. This means you cannot use the $array[]="string" to add parameters.');
-
-            $this->offsetUnset($name);
-            $parameter = new Sabre_VObject_Parameter($name, $value);
-            $parameter->parent = $this;
-            $this->parameters[] = $parameter;
-
-        } elseif ($value instanceof Sabre_VObject_Parameter) {
-            if (!is_null($name))
-                throw new InvalidArgumentException('Don\'t specify a parameter name if you\'re passing a Sabre_VObject_Parameter. Add using $array[]=$parameterObject.');
-
-            $value->parent = $this;
-            $this->parameters[] = $value;
-        } else {
-            throw new InvalidArgumentException('You can only add parameters to the property object');
-        }
-
-    }
-
-    /**
-     * Removes one or more parameters with the specified name
-     *
-     * @param string $name
-     * @return void
-     */
-    public function offsetUnset($name) {
-
-        if (is_int($name)) return parent::offsetUnset($name);
-        $name = strtoupper($name);
-
-        foreach($this->parameters as $key=>$parameter) {
-            if ($parameter->name == $name) {
-                $parameter->parent = null;
-                unset($this->parameters[$key]);
-            }
-
-        }
-
-    }
-
-    /* }}} */
-
-    /**
-     * Called when this object is being cast to a string
-     *
-     * @return string
-     */
-    public function __toString() {
-
-        return (string)$this->value;
-
-    }
-
-    /**
-     * This method is automatically called when the object is cloned.
-     * Specifically, this will ensure all child elements are also cloned.
-     *
-     * @return void
-     */
-    public function __clone() {
-
-        foreach($this->parameters as $key=>$child) {
-            $this->parameters[$key] = clone $child;
-            $this->parameters[$key]->parent = $this;
-        }
-
-    }
-
-}
diff --git a/3rdparty/Sabre/VObject/Property/DateTime.php b/3rdparty/Sabre/VObject/Property/DateTime.php
deleted file mode 100755
index fe2372caa81..00000000000
--- a/3rdparty/Sabre/VObject/Property/DateTime.php
+++ /dev/null
@@ -1,260 +0,0 @@
-<?php
-
-/**
- * DateTime property
- *
- * This element is used for iCalendar properties such as the DTSTART property.
- * It basically provides a few helper functions that make it easier to deal
- * with these. It supports both DATE-TIME and DATE values.
- *
- * In order to use this correctly, you must call setDateTime and getDateTime to
- * retrieve and modify dates respectively.
- *
- * If you use the 'value' or properties directly, this object does not keep
- * reference and results might appear incorrectly.
- *
- * @package Sabre
- * @subpackage VObject
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/)
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- */
-class Sabre_VObject_Property_DateTime extends Sabre_VObject_Property {
-
-    /**
-     * Local 'floating' time
-     */
-    const LOCAL = 1;
-
-    /**
-     * UTC-based time
-     */
-    const UTC = 2;
-
-    /**
-     * Local time plus timezone
-     */
-    const LOCALTZ = 3;
-
-    /**
-     * Only a date, time is ignored
-     */
-    const DATE = 4;
-
-    /**
-     * DateTime representation
-     *
-     * @var DateTime
-     */
-    protected $dateTime;
-
-    /**
-     * dateType
-     *
-     * @var int
-     */
-    protected $dateType;
-
-    /**
-     * Updates the Date and Time.
-     *
-     * @param DateTime $dt
-     * @param int $dateType
-     * @return void
-     */
-    public function setDateTime(DateTime $dt, $dateType = self::LOCALTZ) {
-
-        switch($dateType) {
-
-            case self::LOCAL :
-                $this->setValue($dt->format('Ymd\\THis'));
-                $this->offsetUnset('VALUE');
-                $this->offsetUnset('TZID');
-                $this->offsetSet('VALUE','DATE-TIME');
-                break;
-            case self::UTC :
-                $dt->setTimeZone(new DateTimeZone('UTC'));
-                $this->setValue($dt->format('Ymd\\THis\\Z'));
-                $this->offsetUnset('VALUE');
-                $this->offsetUnset('TZID');
-                $this->offsetSet('VALUE','DATE-TIME');
-                break;
-            case self::LOCALTZ :
-                $this->setValue($dt->format('Ymd\\THis'));
-                $this->offsetUnset('VALUE');
-                $this->offsetUnset('TZID');
-                $this->offsetSet('VALUE','DATE-TIME');
-                $this->offsetSet('TZID', $dt->getTimeZone()->getName());
-                break;
-            case self::DATE :
-                $this->setValue($dt->format('Ymd'));
-                $this->offsetUnset('VALUE');
-                $this->offsetUnset('TZID');
-                $this->offsetSet('VALUE','DATE');
-                break;
-            default :
-                throw new InvalidArgumentException('You must pass a valid dateType constant');
-
-        }
-        $this->dateTime = $dt;
-        $this->dateType = $dateType;
-
-    }
-
-    /**
-     * Returns the current DateTime value.
-     *
-     * If no value was set, this method returns null.
-     *
-     * @return DateTime|null
-     */
-    public function getDateTime() {
-
-        if ($this->dateTime)
-            return $this->dateTime;
-
-        list(
-            $this->dateType,
-            $this->dateTime
-        ) = self::parseData($this->value, $this);
-        return $this->dateTime;
-
-    }
-
-    /**
-     * Returns the type of Date format.
-     *
-     * This method returns one of the format constants. If no date was set,
-     * this method will return null.
-     *
-     * @return int|null
-     */
-    public function getDateType() {
-
-        if ($this->dateType)
-            return $this->dateType;
-
-        list(
-            $this->dateType,
-            $this->dateTime,
-        ) = self::parseData($this->value, $this);
-        return $this->dateType;
-
-    }
-
-    /**
-     * Parses the internal data structure to figure out what the current date
-     * and time is.
-     *
-     * The returned array contains two elements:
-     *   1. A 'DateType' constant (as defined on this class), or null.
-     *   2. A DateTime object (or null)
-     *
-     * @param string|null $propertyValue The string to parse (yymmdd or
-     *                                   ymmddThhmmss, etc..)
-     * @param Sabre_VObject_Property|null $property The instance of the
-     *                                              property we're parsing.
-     * @return array
-     */
-    static public function parseData($propertyValue, Sabre_VObject_Property $property = null) {
-
-        if (is_null($propertyValue)) {
-            return array(null, null);
-        }
-
-        $date = '(?P<year>[1-2][0-9]{3})(?P<month>[0-1][0-9])(?P<date>[0-3][0-9])';
-        $time = '(?P<hour>[0-2][0-9])(?P<minute>[0-5][0-9])(?P<second>[0-5][0-9])';
-        $regex = "/^$date(T$time(?P<isutc>Z)?)?$/";
-
-        if (!preg_match($regex, $propertyValue, $matches)) {
-            throw new InvalidArgumentException($propertyValue . ' is not a valid DateTime or Date string');
-        }
-
-        if (!isset($matches['hour'])) {
-            // Date-only
-            return array(
-                self::DATE,
-                new DateTime($matches['year'] . '-' . $matches['month'] . '-' . $matches['date'] . ' 00:00:00'),
-            );
-        }
-
-        $dateStr =
-            $matches['year'] .'-' .
-            $matches['month'] . '-' .
-            $matches['date'] . ' ' .
-            $matches['hour'] . ':' .
-            $matches['minute'] . ':' .
-            $matches['second'];
-
-        if (isset($matches['isutc'])) {
-            $dt = new DateTime($dateStr,new DateTimeZone('UTC'));
-            $dt->setTimeZone(new DateTimeZone('UTC'));
-            return array(
-                self::UTC,
-                $dt
-            );
-        }
-
-        // Finding the timezone.
-        $tzid = $property['TZID'];
-        if (!$tzid) {
-            return array(
-                self::LOCAL,
-                new DateTime($dateStr)
-            );
-        }
-
-        try {
-            // tzid an Olson identifier?
-            $tz = new DateTimeZone($tzid->value);
-        } catch (Exception $e) {
-
-            // Not an Olson id, we're going to try to find the information 
-            // through the time zone name map.
-            $newtzid = Sabre_VObject_WindowsTimezoneMap::lookup($tzid->value);
-            if (is_null($newtzid)) {
-
-                // Not a well known time zone name either, we're going to try 
-                // to find the information through the VTIMEZONE object.
-
-                // First we find the root object
-                $root = $property;
-                while($root->parent) {
-                    $root = $root->parent;
-                }
-
-                if (isset($root->VTIMEZONE)) {
-                    foreach($root->VTIMEZONE as $vtimezone) {
-                        if (((string)$vtimezone->TZID) == $tzid) {
-                            if (isset($vtimezone->{'X-LIC-LOCATION'})) {
-                                $newtzid = (string)$vtimezone->{'X-LIC-LOCATION'};
-                            } else {
-                                // No libical location specified. As a last resort we could 
-                                // try matching $vtimezone's DST rules against all known 
-                                // time zones returned by DateTimeZone::list*
-
-                                // TODO
-                            }
-                        }
-                    }
-                }
-            }
-
-            try {
-                $tz = new DateTimeZone($newtzid);
-            } catch (Exception $e) {
-                // If all else fails, we use the default PHP timezone
-                $tz = new DateTimeZone(date_default_timezone_get()); 
-            }
-        }
-        $dt = new DateTime($dateStr, $tz);
-        $dt->setTimeZone($tz);
-
-        return array(
-            self::LOCALTZ,
-            $dt
-        );
-
-    }
-
-}
diff --git a/3rdparty/Sabre/VObject/Property/MultiDateTime.php b/3rdparty/Sabre/VObject/Property/MultiDateTime.php
deleted file mode 100755
index ae53ab6a617..00000000000
--- a/3rdparty/Sabre/VObject/Property/MultiDateTime.php
+++ /dev/null
@@ -1,166 +0,0 @@
-<?php
-
-/**
- * Multi-DateTime property
- *
- * This element is used for iCalendar properties such as the EXDATE property.
- * It basically provides a few helper functions that make it easier to deal
- * with these. It supports both DATE-TIME and DATE values.
- *
- * In order to use this correctly, you must call setDateTimes and getDateTimes
- * to retrieve and modify dates respectively.
- *
- * If you use the 'value' or properties directly, this object does not keep
- * reference and results might appear incorrectly.
- *
- * @package Sabre
- * @subpackage VObject
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/)
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- */
-class Sabre_VObject_Property_MultiDateTime extends Sabre_VObject_Property {
-
-    /**
-     * DateTime representation
-     *
-     * @var DateTime[]
-     */
-    protected $dateTimes;
-
-    /**
-     * dateType
-     *
-     * This is one of the Sabre_VObject_Property_DateTime constants.
-     *
-     * @var int
-     */
-    protected $dateType;
-
-    /**
-     * Updates the value
-     *
-     * @param array $dt Must be an array of DateTime objects.
-     * @param int $dateType
-     * @return void
-     */
-    public function setDateTimes(array $dt, $dateType = Sabre_VObject_Property_DateTime::LOCALTZ) {
-
-        foreach($dt as $i)
-            if (!$i instanceof DateTime)
-                throw new InvalidArgumentException('You must pass an array of DateTime objects');
-
-        $this->offsetUnset('VALUE');
-        $this->offsetUnset('TZID');
-        switch($dateType) {
-
-            case Sabre_VObject_Property_DateTime::LOCAL :
-                $val = array();
-                foreach($dt as $i) {
-                    $val[] = $i->format('Ymd\\THis');
-                }
-                $this->setValue(implode(',',$val));
-                $this->offsetSet('VALUE','DATE-TIME');
-                break;
-            case Sabre_VObject_Property_DateTime::UTC :
-                $val = array();
-                foreach($dt as $i) {
-                    $i->setTimeZone(new DateTimeZone('UTC'));
-                    $val[] = $i->format('Ymd\\THis\\Z');
-                }
-                $this->setValue(implode(',',$val));
-                $this->offsetSet('VALUE','DATE-TIME');
-                break;
-            case Sabre_VObject_Property_DateTime::LOCALTZ :
-                $val = array();
-                foreach($dt as $i) {
-                    $val[] = $i->format('Ymd\\THis');
-                }
-                $this->setValue(implode(',',$val));
-                $this->offsetSet('VALUE','DATE-TIME');
-                $this->offsetSet('TZID', $dt[0]->getTimeZone()->getName());
-                break;
-            case Sabre_VObject_Property_DateTime::DATE :
-                $val = array();
-                foreach($dt as $i) {
-                    $val[] = $i->format('Ymd');
-                }
-                $this->setValue(implode(',',$val));
-                $this->offsetSet('VALUE','DATE');
-                break;
-            default :
-                throw new InvalidArgumentException('You must pass a valid dateType constant');
-
-        }
-        $this->dateTimes = $dt;
-        $this->dateType = $dateType;
-
-    }
-
-    /**
-     * Returns the current DateTime value.
-     *
-     * If no value was set, this method returns null.
-     *
-     * @return array|null
-     */
-    public function getDateTimes() {
-
-        if ($this->dateTimes)
-            return $this->dateTimes;
-
-        $dts = array();
-
-        if (!$this->value) {
-            $this->dateTimes = null;
-            $this->dateType = null;
-            return null;
-        }
-
-        foreach(explode(',',$this->value) as $val) {
-            list(
-                $type,
-                $dt
-            ) = Sabre_VObject_Property_DateTime::parseData($val, $this);
-            $dts[] = $dt;
-            $this->dateType = $type;
-        }
-        $this->dateTimes = $dts;
-        return $this->dateTimes;
-
-    }
-
-    /**
-     * Returns the type of Date format.
-     *
-     * This method returns one of the format constants. If no date was set,
-     * this method will return null.
-     *
-     * @return int|null
-     */
-    public function getDateType() {
-
-        if ($this->dateType)
-            return $this->dateType;
-
-        if (!$this->value) {
-            $this->dateTimes = null;
-            $this->dateType = null;
-            return null;
-        }
-
-        $dts = array();
-        foreach(explode(',',$this->value) as $val) {
-            list(
-                $type,
-                $dt
-            ) = Sabre_VObject_Property_DateTime::parseData($val, $this);
-            $dts[] = $dt;
-            $this->dateType = $type;
-        }
-        $this->dateTimes = $dts;
-        return $this->dateType;
-
-    }
-
-}
diff --git a/3rdparty/Sabre/VObject/Reader.php b/3rdparty/Sabre/VObject/Reader.php
deleted file mode 100755
index eea73fa3dce..00000000000
--- a/3rdparty/Sabre/VObject/Reader.php
+++ /dev/null
@@ -1,183 +0,0 @@
-<?php
-
-/**
- * VCALENDAR/VCARD reader
- *
- * This class reads the vobject file, and returns a full element tree.
- *
- * TODO: this class currently completely works 'statically'. This is pointless,
- * and defeats OOP principals. Needs refactoring in a future version.
- *
- * @package Sabre
- * @subpackage VObject
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/)
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- */
-class Sabre_VObject_Reader {
-
-    /**
-     * Parses the file and returns the top component
-     *
-     * @param string $data
-     * @return Sabre_VObject_Element
-     */
-    static function read($data) {
-
-        // Normalizing newlines
-        $data = str_replace(array("\r","\n\n"), array("\n","\n"), $data);
-
-        $lines = explode("\n", $data);
-
-        // Unfolding lines
-        $lines2 = array();
-        foreach($lines as $line) {
-
-            // Skipping empty lines
-            if (!$line) continue;
-
-            if ($line[0]===" " || $line[0]==="\t") {
-                $lines2[count($lines2)-1].=substr($line,1);
-            } else {
-                $lines2[] = $line;
-            }
-
-        }
-
-        unset($lines);
-
-        reset($lines2);
-
-        return self::readLine($lines2);
-
-    }
-
-    /**
-     * Reads and parses a single line.
-     *
-     * This method receives the full array of lines. The array pointer is used
-     * to traverse.
-     *
-     * @param array $lines
-     * @return Sabre_VObject_Element
-     */
-    static private function readLine(&$lines) {
-
-        $line = current($lines);
-        $lineNr = key($lines);
-        next($lines);
-
-        // Components
-        if (stripos($line,"BEGIN:")===0) {
-
-            $componentName = strtoupper(substr($line,6));
-            $obj = Sabre_VObject_Component::create($componentName);
-
-            $nextLine = current($lines);
-
-            while(stripos($nextLine,"END:")!==0) {
-
-                $obj->add(self::readLine($lines));
-
-                $nextLine = current($lines);
-
-                if ($nextLine===false)
-                    throw new Sabre_VObject_ParseException('Invalid VObject. Document ended prematurely.');
-
-            }
-
-            // Checking component name of the 'END:' line.
-            if (substr($nextLine,4)!==$obj->name) {
-                throw new Sabre_VObject_ParseException('Invalid VObject, expected: "END:' . $obj->name . '" got: "' . $nextLine . '"');
-            }
-            next($lines);
-
-            return $obj;
-
-        }
-
-        // Properties
-        //$result = preg_match('/(?P<name>[A-Z0-9-]+)(?:;(?P<parameters>^(?<!:):))(.*)$/',$line,$matches);
-
-
-        $token = '[A-Z0-9-\.]+';
-        $parameters = "(?:;(?P<parameters>([^:^\"]|\"([^\"]*)\")*))?";
-        $regex = "/^(?P<name>$token)$parameters:(?P<value>.*)$/i";
-
-        $result = preg_match($regex,$line,$matches);
-
-        if (!$result) {
-            throw new Sabre_VObject_ParseException('Invalid VObject, line ' . ($lineNr+1) . ' did not follow the icalendar/vcard format');
-        }
-
-        $propertyName = strtoupper($matches['name']);
-        $propertyValue = preg_replace_callback('#(\\\\(\\\\|N|n|;|,))#',function($matches) {
-            if ($matches[2]==='n' || $matches[2]==='N') {
-                return "\n";
-            } else {
-                return $matches[2];
-            }
-        }, $matches['value']);
-
-        $obj = Sabre_VObject_Property::create($propertyName, $propertyValue);
-
-        if ($matches['parameters']) {
-
-            foreach(self::readParameters($matches['parameters']) as $param) {
-                $obj->add($param);
-            }
-
-        }
-
-        return $obj;
-
-
-    }
-
-    /**
-     * Reads a parameter list from a property
-     *
-     * This method returns an array of Sabre_VObject_Parameter
-     *
-     * @param string $parameters
-     * @return array
-     */
-    static private function readParameters($parameters) {
-
-        $token = '[A-Z0-9-]+';
-
-        $paramValue = '(?P<paramValue>[^\"^;]*|"[^"]*")';
-
-        $regex = "/(?<=^|;)(?P<paramName>$token)(=$paramValue(?=$|;))?/i";
-        preg_match_all($regex, $parameters, $matches,  PREG_SET_ORDER);
-
-        $params = array();
-        foreach($matches as $match) {
-
-            $value = isset($match['paramValue'])?$match['paramValue']:null;
-
-            if (isset($value[0])) {
-                // Stripping quotes, if needed
-                if ($value[0] === '"') $value = substr($value,1,strlen($value)-2);
-            } else {
-                $value = '';
-            }
-
-            $value = preg_replace_callback('#(\\\\(\\\\|N|n|;|,))#',function($matches) {
-                if ($matches[2]==='n' || $matches[2]==='N') {
-                    return "\n";
-                } else {
-                    return $matches[2];
-                }
-            }, $value);
-
-            $params[] = new Sabre_VObject_Parameter($match['paramName'], $value);
-
-        }
-
-        return $params;
-
-    }
-
-
-}
diff --git a/3rdparty/Sabre/VObject/RecurrenceIterator.php b/3rdparty/Sabre/VObject/RecurrenceIterator.php
deleted file mode 100755
index 740270dd8f0..00000000000
--- a/3rdparty/Sabre/VObject/RecurrenceIterator.php
+++ /dev/null
@@ -1,1043 +0,0 @@
-<?php
-
-/**
- * This class is used to determine new for a recurring event, when the next
- * events occur.
- *
- * This iterator may loop infinitely in the future, therefore it is important
- * that if you use this class, you set hard limits for the amount of iterations
- * you want to handle.
- *
- * Note that currently there is not full support for the entire iCalendar
- * specification, as it's very complex and contains a lot of permutations
- * that's not yet used very often in software.
- *
- * For the focus has been on features as they actually appear in Calendaring
- * software, but this may well get expanded as needed / on demand
- *
- * The following RRULE properties are supported
- *   * UNTIL
- *   * INTERVAL
- *   * COUNT
- *   * FREQ=DAILY
- *     * BYDAY
- *   * FREQ=WEEKLY
- *     * BYDAY
- *     * WKST
- *   * FREQ=MONTHLY
- *     * BYMONTHDAY
- *     * BYDAY
- *     * BYSETPOS
- *   * FREQ=YEARLY
- *     * BYMONTH
- *     * BYMONTHDAY (only if BYMONTH is also set)
- *     * BYDAY (only if BYMONTH is also set)
- *
- * Anything beyond this is 'undefined', which means that it may get ignored, or
- * you may get unexpected results. The effect is that in some applications the
- * specified recurrence may look incorrect, or is missing.
- *
- * @package Sabre
- * @subpackage VObject
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/)
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- */
-class Sabre_VObject_RecurrenceIterator implements Iterator {
-
-    /**
-     * The initial event date
-     *
-     * @var DateTime
-     */
-    public $startDate;
-
-    /**
-     * The end-date of the initial event
-     *
-     * @var DateTime
-     */
-    public $endDate;
-
-    /**
-     * The 'current' recurrence.
-     *
-     * This will be increased for every iteration.
-     *
-     * @var DateTime
-     */
-    public $currentDate;
-
-
-    /**
-     * List of dates that are excluded from the rules.
-     *
-     * This list contains the items that have been overriden by the EXDATE
-     * property.
-     *
-     * @var array
-     */
-    public $exceptionDates = array();
-
-    /**
-     * Base event
-     *
-     * @var Sabre_VObject_Component_VEvent
-     */
-    public $baseEvent;
-
-    /**
-     * List of dates that are overridden by other events.
-     * Similar to $overriddenEvents, but this just contains the original dates.
-     *
-     * @var array
-     */
-    public $overriddenDates = array();
-
-    /**
-     * list of events that are 'overridden'.
-     *
-     * This is an array of Sabre_VObject_Component_VEvent objects.
-     *
-     * @var array
-     */
-    public $overriddenEvents = array();
-
-
-    /**
-     * Frequency is one of: secondly, minutely, hourly, daily, weekly, monthly,
-     * yearly.
-     *
-     * @var string
-     */
-    public $frequency;
-
-    /**
-     * The last instance of this recurrence, inclusively
-     *
-     * @var DateTime|null
-     */
-    public $until;
-
-    /**
-     * The number of recurrences, or 'null' if infinitely recurring.
-     *
-     * @var int
-     */
-    public $count;
-
-    /**
-     * The interval.
-     *
-     * If for example frequency is set to daily, interval = 2 would mean every
-     * 2 days.
-     *
-     * @var int
-     */
-    public $interval = 1;
-
-    /**
-     * Which seconds to recur.
-     *
-     * This is an array of integers (between 0 and 60)
-     *
-     * @var array
-     */
-    public $bySecond;
-
-    /**
-     * Which minutes to recur
-     *
-     * This is an array of integers (between 0 and 59)
-     *
-     * @var array
-     */
-    public $byMinute;
-
-    /**
-     * Which hours to recur
-     *
-     * This is an array of integers (between 0 and 23)
-     *
-     * @var array
-     */
-    public $byHour;
-
-    /**
-     * Which weekdays to recur.
-     *
-     * This is an array of weekdays
-     *
-     * This may also be preceeded by a positive or negative integer. If present,
-     * this indicates the nth occurrence of a specific day within the monthly or
-     * yearly rrule. For instance, -2TU indicates the second-last tuesday of
-     * the month, or year.
-     *
-     * @var array
-     */
-    public $byDay;
-
-    /**
-     * Which days of the month to recur
-     *
-     * This is an array of days of the months (1-31). The value can also be
-     * negative. -5 for instance means the 5th last day of the month.
-     *
-     * @var array
-     */
-    public $byMonthDay;
-
-    /**
-     * Which days of the year to recur.
-     *
-     * This is an array with days of the year (1 to 366). The values can also
-     * be negative. For instance, -1 will always represent the last day of the
-     * year. (December 31st).
-     *
-     * @var array
-     */
-    public $byYearDay;
-
-    /**
-     * Which week numbers to recur.
-     *
-     * This is an array of integers from 1 to 53. The values can also be
-     * negative. -1 will always refer to the last week of the year.
-     *
-     * @var array
-     */
-    public $byWeekNo;
-
-    /**
-     * Which months to recur
-     *
-     * This is an array of integers from 1 to 12.
-     *
-     * @var array
-     */
-    public $byMonth;
-
-    /**
-     * Which items in an existing st to recur.
-     *
-     * These numbers work together with an existing by* rule. It specifies
-     * exactly which items of the existing by-rule to filter.
-     *
-     * Valid values are 1 to 366 and -1 to -366. As an example, this can be
-     * used to recur the last workday of the month.
-     *
-     * This would be done by setting frequency to 'monthly', byDay to
-     * 'MO,TU,WE,TH,FR' and bySetPos to -1.
-     *
-     * @var array
-     */
-    public $bySetPos;
-
-    /**
-     * When a week starts
-     *
-     * @var string
-     */
-    public $weekStart = 'MO';
-
-    /**
-     * The current item in the list
-     *
-     * @var int
-     */
-    public $counter = 0;
-
-    /**
-     * Simple mapping from iCalendar day names to day numbers
-     *
-     * @var array
-     */
-    private $dayMap = array(
-        'SU' => 0,
-        'MO' => 1,
-        'TU' => 2,
-        'WE' => 3,
-        'TH' => 4,
-        'FR' => 5,
-        'SA' => 6,
-    );
-
-    /**
-     * Mappings between the day number and english day name.
-     *
-     * @var array
-     */
-    private $dayNames = array(
-        0 => 'Sunday',
-        1 => 'Monday',
-        2 => 'Tuesday',
-        3 => 'Wednesday',
-        4 => 'Thursday',
-        5 => 'Friday',
-        6 => 'Saturday',
-    );
-
-    /**
-     * If the current iteration of the event is an overriden event, this
-     * property will hold the VObject
-     *
-     * @var Sabre_Component_VObject
-     */
-    private $currentOverriddenEvent;
-
-    /**
-     * This property may contain the date of the next not-overridden event.
-     * This date is calculated sometimes a bit early, before overridden events
-     * are evaluated.
-     *
-     * @var DateTime
-     */
-    private $nextDate;
-
-    /**
-     * Creates the iterator
-     *
-     * You should pass a VCALENDAR component, as well as the UID of the event
-     * we're going to traverse.
-     *
-     * @param Sabre_VObject_Component $vcal
-     * @param string|null $uid
-     */
-    public function __construct(Sabre_VObject_Component $vcal, $uid=null) {
-
-        if (is_null($uid)) {
-            if ($vcal->name === 'VCALENDAR') {
-                throw new InvalidArgumentException('If you pass a VCALENDAR object, you must pass a uid argument as well');
-            }
-            $components = array($vcal);
-            $uid = (string)$vcal->uid;
-        } else {
-            $components = $vcal->select('VEVENT');
-        }
-        foreach($components as $component) {
-            if ((string)$component->uid == $uid) {
-                if (isset($component->{'RECURRENCE-ID'})) {
-                    $this->overriddenEvents[$component->DTSTART->getDateTime()->getTimeStamp()] = $component;
-                    $this->overriddenDates[] = $component->{'RECURRENCE-ID'}->getDateTime();
-                } else {
-                    $this->baseEvent = $component;
-                }
-            }
-        }
-        if (!$this->baseEvent) {
-            throw new InvalidArgumentException('Could not find a base event with uid: ' . $uid);
-        }
-
-        $this->startDate = clone $this->baseEvent->DTSTART->getDateTime();
-
-        $this->endDate = null;
-        if (isset($this->baseEvent->DTEND)) {
-            $this->endDate = clone $this->baseEvent->DTEND->getDateTime();
-        } else {
-            $this->endDate = clone $this->startDate;
-            if (isset($this->baseEvent->DURATION)) {
-                $this->endDate->add(Sabre_VObject_DateTimeParser::parse($this->baseEvent->DURATION->value));
-            } elseif ($this->baseEvent->DTSTART->getDateType()===Sabre_VObject_Property_DateTime::DATE) {
-                $this->endDate->modify('+1 day');
-            }
-        }
-        $this->currentDate = clone $this->startDate;
-
-        $rrule = (string)$this->baseEvent->RRULE;
-
-        $parts = explode(';', $rrule);
-
-        foreach($parts as $part) {
-
-            list($key, $value) = explode('=', $part, 2);
-
-            switch(strtoupper($key)) {
-
-                case 'FREQ' :
-                    if (!in_array(
-                        strtolower($value),
-                        array('secondly','minutely','hourly','daily','weekly','monthly','yearly')
-                    )) {
-                        throw new InvalidArgumentException('Unknown value for FREQ=' . strtoupper($value));
-
-                    }
-                    $this->frequency = strtolower($value);
-                    break;
-
-                case 'UNTIL' :
-                    $this->until = Sabre_VObject_DateTimeParser::parse($value);
-                    break;
-
-                case 'COUNT' :
-                    $this->count = (int)$value;
-                    break;
-
-                case 'INTERVAL' :
-                    $this->interval = (int)$value;
-                    break;
-
-                case 'BYSECOND' :
-                    $this->bySecond = explode(',', $value);
-                    break;
-
-                case 'BYMINUTE' :
-                    $this->byMinute = explode(',', $value);
-                    break;
-
-                case 'BYHOUR' :
-                    $this->byHour = explode(',', $value);
-                    break;
-
-                case 'BYDAY' :
-                    $this->byDay = explode(',', strtoupper($value));
-                    break;
-
-                case 'BYMONTHDAY' :
-                    $this->byMonthDay = explode(',', $value);
-                    break;
-
-                case 'BYYEARDAY' :
-                    $this->byYearDay = explode(',', $value);
-                    break;
-
-                case 'BYWEEKNO' :
-                    $this->byWeekNo = explode(',', $value);
-                    break;
-
-                case 'BYMONTH' :
-                    $this->byMonth = explode(',', $value);
-                    break;
-
-                case 'BYSETPOS' :
-                    $this->bySetPos = explode(',', $value);
-                    break;
-
-                case 'WKST' :
-                    $this->weekStart = strtoupper($value);
-                    break;
-
-            }
-
-        }
-
-        // Parsing exception dates
-        if (isset($this->baseEvent->EXDATE)) {
-            foreach($this->baseEvent->EXDATE as $exDate) {
-
-                foreach(explode(',', (string)$exDate) as $exceptionDate) {
-
-                    $this->exceptionDates[] =
-                        Sabre_VObject_DateTimeParser::parse($exceptionDate, $this->startDate->getTimeZone());
-
-                }
-
-            }
-
-        }
-
-    }
-
-    /**
-     * Returns the current item in the list
-     *
-     * @return DateTime
-     */
-    public function current() {
-
-        if (!$this->valid()) return null;
-        return clone $this->currentDate;
-
-    }
-
-    /**
-     * This method returns the startdate for the current iteration of the
-     * event.
-     *
-     * @return DateTime
-     */
-    public function getDtStart() {
-
-        if (!$this->valid()) return null;
-        return clone $this->currentDate;
-
-    }
-
-    /**
-     * This method returns the enddate for the current iteration of the
-     * event.
-     *
-     * @return DateTime
-     */
-    public function getDtEnd() {
-
-        if (!$this->valid()) return null;
-        $dtEnd = clone $this->currentDate;
-        $dtEnd->add( $this->startDate->diff( $this->endDate ) );
-        return clone $dtEnd;
-
-    }
-
-    /**
-     * Returns a VEVENT object with the updated start and end date.
-     *
-     * Any recurrence information is removed, and this function may return an
-     * 'overridden' event instead.
-     *
-     * This method always returns a cloned instance.
-     *
-     * @return void
-     */
-    public function getEventObject() {
-
-        if ($this->currentOverriddenEvent) {
-            return clone $this->currentOverriddenEvent;
-        }
-        $event = clone $this->baseEvent;
-        unset($event->RRULE);
-        unset($event->EXDATE);
-        unset($event->RDATE);
-        unset($event->EXRULE);
-
-        $event->DTSTART->setDateTime($this->getDTStart(), $event->DTSTART->getDateType());
-        if (isset($event->DTEND)) {
-            $event->DTEND->setDateTime($this->getDtEnd(), $event->DTSTART->getDateType());
-        }
-        if ($this->counter > 0) {
-            $event->{'RECURRENCE-ID'} = (string)$event->DTSTART;
-        }
-
-        return $event;
-
-    }
-
-    /**
-     * Returns the current item number
-     *
-     * @return int
-     */
-    public function key() {
-
-        return $this->counter;
-
-    }
-
-    /**
-     * Whether or not there is a 'next item'
-     *
-     * @return bool
-     */
-    public function valid() {
-
-        if (!is_null($this->count)) {
-            return $this->counter < $this->count;
-        }
-        if (!is_null($this->until)) {
-            return $this->currentDate <= $this->until;
-        }
-        return true;
-
-    }
-
-    /**
-     * Resets the iterator
-     *
-     * @return void
-     */
-    public function rewind() {
-
-        $this->currentDate = clone $this->startDate;
-        $this->counter = 0;
-
-    }
-
-    /**
-     * This method allows you to quickly go to the next occurrence after the
-     * specified date.
-     *
-     * Note that this checks the current 'endDate', not the 'stardDate'. This
-     * means that if you forward to January 1st, the iterator will stop at the
-     * first event that ends *after* January 1st.
-     *
-     * @param DateTime $dt
-     * @return void
-     */
-    public function fastForward(DateTime $dt) {
-
-        while($this->valid() && $this->getDTEnd() <= $dt) {
-            $this->next();
-        }
-
-    }
-
-    /**
-     * Goes on to the next iteration
-     *
-     * @return void
-     */
-    public function next() {
-
-        /*
-        if (!is_null($this->count) && $this->counter >= $this->count) {
-            $this->currentDate = null;
-        }*/
-
-
-        $previousStamp = $this->currentDate->getTimeStamp();
-
-        while(true) {
-
-            $this->currentOverriddenEvent = null;
-
-            // If we have a next date 'stored', we use that
-            if ($this->nextDate) {
-                $this->currentDate = $this->nextDate;
-                $currentStamp = $this->currentDate->getTimeStamp();
-                $this->nextDate = null;
-            } else {
-
-                // Otherwise, we calculate it
-                switch($this->frequency) {
-
-                    case 'daily' :
-                        $this->nextDaily();
-                        break;
-
-                    case 'weekly' :
-                        $this->nextWeekly();
-                        break;
-
-                    case 'monthly' :
-                        $this->nextMonthly();
-                        break;
-
-                    case 'yearly' :
-                        $this->nextYearly();
-                        break;
-
-                }
-                $currentStamp = $this->currentDate->getTimeStamp();
-
-                // Checking exception dates
-                foreach($this->exceptionDates as $exceptionDate) {
-                    if ($this->currentDate == $exceptionDate) {
-                        $this->counter++;
-                        continue 2;
-                    }
-                }
-                foreach($this->overriddenDates as $overriddenDate) {
-                    if ($this->currentDate == $overriddenDate) {
-                        continue 2;
-                    }
-                }
-
-            }
-
-            // Checking overriden events
-            foreach($this->overriddenEvents as $index=>$event) {
-                if ($index > $previousStamp && $index <= $currentStamp) {
-
-                    // We're moving the 'next date' aside, for later use.
-                    $this->nextDate = clone $this->currentDate;
-
-                    $this->currentDate = $event->DTSTART->getDateTime();
-                    $this->currentOverriddenEvent = $event;
-
-                    break;
-                }
-            }
-
-            break;
-
-        }
-
-        /*
-        if (!is_null($this->until)) {
-            if($this->currentDate > $this->until) {
-                $this->currentDate = null;
-            }
-        }*/
-
-        $this->counter++;
-
-    }
-
-    /**
-     * Does the processing for advancing the iterator for daily frequency.
-     *
-     * @return void
-     */
-    protected function nextDaily() {
-
-        if (!$this->byDay) {
-            $this->currentDate->modify('+' . $this->interval . ' days');
-            return;
-        }
-
-        $recurrenceDays = array();
-        foreach($this->byDay as $byDay) {
-
-            // The day may be preceeded with a positive (+n) or
-            // negative (-n) integer. However, this does not make
-            // sense in 'weekly' so we ignore it here.
-            $recurrenceDays[] = $this->dayMap[substr($byDay,-2)];
-
-        }
-
-        do {
-
-            $this->currentDate->modify('+' . $this->interval . ' days');
-
-            // Current day of the week
-            $currentDay = $this->currentDate->format('w');
-
-        } while (!in_array($currentDay, $recurrenceDays));
-
-    }
-
-    /**
-     * Does the processing for advancing the iterator for weekly frequency.
-     *
-     * @return void
-     */
-    protected function nextWeekly() {
-
-        if (!$this->byDay) {
-            $this->currentDate->modify('+' . $this->interval . ' weeks');
-            return;
-        }
-
-        $recurrenceDays = array();
-        foreach($this->byDay as $byDay) {
-
-            // The day may be preceeded with a positive (+n) or
-            // negative (-n) integer. However, this does not make
-            // sense in 'weekly' so we ignore it here.
-            $recurrenceDays[] = $this->dayMap[substr($byDay,-2)];
-
-        }
-
-        // Current day of the week
-        $currentDay = $this->currentDate->format('w');
-
-        // First day of the week:
-        $firstDay = $this->dayMap[$this->weekStart];
-
-        $time = array(
-            $this->currentDate->format('H'),
-            $this->currentDate->format('i'),
-            $this->currentDate->format('s')
-        );
-
-        // Increasing the 'current day' until we find our next
-        // occurrence.
-        while(true) {
-
-            $currentDay++;
-
-            if ($currentDay>6) {
-                $currentDay = 0;
-            }
-
-            // We need to roll over to the next week
-            if ($currentDay === $firstDay) {
-                $this->currentDate->modify('+' . $this->interval . ' weeks');
-
-                // We need to go to the first day of this week, but only if we
-                // are not already on this first day of this week.
-                if($this->currentDate->format('w') != $firstDay) {
-                    $this->currentDate->modify('last ' . $this->dayNames[$this->dayMap[$this->weekStart]]);
-                    $this->currentDate->setTime($time[0],$time[1],$time[2]);
-                }
-            }
-
-            // We have a match
-            if (in_array($currentDay ,$recurrenceDays)) {
-                $this->currentDate->modify($this->dayNames[$currentDay]);
-                $this->currentDate->setTime($time[0],$time[1],$time[2]);
-                break;
-            }
-
-        }
-
-    }
-
-    /**
-     * Does the processing for advancing the iterator for monthly frequency.
-     *
-     * @return void
-     */
-    protected function nextMonthly() {
-
-        $currentDayOfMonth = $this->currentDate->format('j');
-        if (!$this->byMonthDay && !$this->byDay) {
-
-            // If the current day is higher than the 28th, rollover can
-            // occur to the next month. We Must skip these invalid
-            // entries.
-            if ($currentDayOfMonth < 29) {
-                $this->currentDate->modify('+' . $this->interval . ' months');
-            } else {
-                $increase = 0;
-                do {
-                    $increase++;
-                    $tempDate = clone $this->currentDate;
-                    $tempDate->modify('+ ' . ($this->interval*$increase) . ' months');
-                } while ($tempDate->format('j') != $currentDayOfMonth);
-                $this->currentDate = $tempDate;
-            }
-            return;
-        }
-
-        while(true) {
-
-            $occurrences = $this->getMonthlyOccurrences();
-
-            foreach($occurrences as $occurrence) {
-
-                // The first occurrence thats higher than the current
-                // day of the month wins.
-                if ($occurrence > $currentDayOfMonth) {
-                    break 2;
-                }
-
-            }
-
-            // If we made it all the way here, it means there were no
-            // valid occurrences, and we need to advance to the next
-            // month.
-            $this->currentDate->modify('first day of this month');
-            $this->currentDate->modify('+ ' . $this->interval . ' months');
-
-            // This goes to 0 because we need to start counting at hte
-            // beginning.
-            $currentDayOfMonth = 0;
-
-        }
-
-        $this->currentDate->setDate($this->currentDate->format('Y'), $this->currentDate->format('n'), $occurrence);
-
-    }
-
-    /**
-     * Does the processing for advancing the iterator for yearly frequency.
-     *
-     * @return void
-     */
-    protected function nextYearly() {
-
-        $currentMonth = $this->currentDate->format('n');
-        $currentYear = $this->currentDate->format('Y');
-        $currentDayOfMonth = $this->currentDate->format('j');
-
-        // No sub-rules, so we just advance by year
-        if (!$this->byMonth) {
-
-            // Unless it was a leap day!
-            if ($currentMonth==2 && $currentDayOfMonth==29) {
-
-                $counter = 0;
-                do {
-                    $counter++;
-                    // Here we increase the year count by the interval, until
-                    // we hit a date that's also in a leap year.
-                    //
-                    // We could just find the next interval that's dividable by
-                    // 4, but that would ignore the rule that there's no leap
-                    // year every year that's dividable by a 100, but not by
-                    // 400. (1800, 1900, 2100). So we just rely on the datetime
-                    // functions instead.
-                    $nextDate = clone $this->currentDate;
-                    $nextDate->modify('+ ' . ($this->interval*$counter) . ' years');
-                } while ($nextDate->format('n')!=2);
-                $this->currentDate = $nextDate;
-
-                return;
-
-            }
-
-            // The easiest form
-            $this->currentDate->modify('+' . $this->interval . ' years');
-            return;
-
-        }
-
-        $currentMonth = $this->currentDate->format('n');
-        $currentYear = $this->currentDate->format('Y');
-        $currentDayOfMonth = $this->currentDate->format('j');
-
-        $advancedToNewMonth = false;
-
-        // If we got a byDay or getMonthDay filter, we must first expand
-        // further.
-        if ($this->byDay || $this->byMonthDay) {
-
-            while(true) {
-
-                $occurrences = $this->getMonthlyOccurrences();
-
-                foreach($occurrences as $occurrence) {
-
-                    // The first occurrence that's higher than the current
-                    // day of the month wins.
-                    // If we advanced to the next month or year, the first
-                    // occurence is always correct.
-                    if ($occurrence > $currentDayOfMonth || $advancedToNewMonth) {
-                        break 2;
-                    }
-
-                }
-
-                // If we made it here, it means we need to advance to
-                // the next month or year.
-                $currentDayOfMonth = 1;
-                $advancedToNewMonth = true;
-                do {
-
-                    $currentMonth++;
-                    if ($currentMonth>12) {
-                        $currentYear+=$this->interval;
-                        $currentMonth = 1;
-                    }
-                } while (!in_array($currentMonth, $this->byMonth));
-
-                $this->currentDate->setDate($currentYear, $currentMonth, $currentDayOfMonth);
-
-            }
-
-            // If we made it here, it means we got a valid occurrence
-            $this->currentDate->setDate($currentYear, $currentMonth, $occurrence);
-            return;
-
-        } else {
-
-            // These are the 'byMonth' rules, if there are no byDay or
-            // byMonthDay sub-rules.
-            do {
-
-                $currentMonth++;
-                if ($currentMonth>12) {
-                    $currentYear+=$this->interval;
-                    $currentMonth = 1;
-                }
-            } while (!in_array($currentMonth, $this->byMonth));
-            $this->currentDate->setDate($currentYear, $currentMonth, $currentDayOfMonth);
-
-            return;
-
-        }
-
-    }
-
-    /**
-     * Returns all the occurrences for a monthly frequency with a 'byDay' or
-     * 'byMonthDay' expansion for the current month.
-     *
-     * The returned list is an array of integers with the day of month (1-31).
-     *
-     * @return array
-     */
-    protected function getMonthlyOccurrences() {
-
-        $startDate = clone $this->currentDate;
-
-        $byDayResults = array();
-
-        // Our strategy is to simply go through the byDays, advance the date to
-        // that point and add it to the results.
-        if ($this->byDay) foreach($this->byDay as $day) {
-
-            $dayName = $this->dayNames[$this->dayMap[substr($day,-2)]];
-
-            // Dayname will be something like 'wednesday'. Now we need to find
-            // all wednesdays in this month.
-            $dayHits = array();
-
-            $checkDate = clone $startDate;
-            $checkDate->modify('first day of this month');
-            $checkDate->modify($dayName);
-
-            do {
-                $dayHits[] = $checkDate->format('j');
-                $checkDate->modify('next ' . $dayName);
-            } while ($checkDate->format('n') === $startDate->format('n'));
-
-            // So now we have 'all wednesdays' for month. It is however
-            // possible that the user only really wanted the 1st, 2nd or last
-            // wednesday.
-            if (strlen($day)>2) {
-                $offset = (int)substr($day,0,-2);
-
-                if ($offset>0) {
-                    // It is possible that the day does not exist, such as a
-                    // 5th or 6th wednesday of the month.
-                    if (isset($dayHits[$offset-1])) {
-                        $byDayResults[] = $dayHits[$offset-1];
-                    }
-                } else {
-
-                    // if it was negative we count from the end of the array
-                    $byDayResults[] = $dayHits[count($dayHits) + $offset];
-                }
-            } else {
-                // There was no counter (first, second, last wednesdays), so we
-                // just need to add the all to the list).
-                $byDayResults = array_merge($byDayResults, $dayHits);
-
-            }
-
-        }
-
-        $byMonthDayResults = array();
-        if ($this->byMonthDay) foreach($this->byMonthDay as $monthDay) {
-
-            // Removing values that are out of range for this month
-            if ($monthDay > $startDate->format('t') ||
-                $monthDay < 0-$startDate->format('t')) {
-                    continue;
-            }
-            if ($monthDay>0) {
-                $byMonthDayResults[] = $monthDay;
-            } else {
-                // Negative values
-                $byMonthDayResults[] = $startDate->format('t') + 1 + $monthDay;
-            }
-        }
-
-        // If there was just byDay or just byMonthDay, they just specify our
-        // (almost) final list. If both were provided, then byDay limits the
-        // list.
-        if ($this->byMonthDay && $this->byDay) {
-            $result = array_intersect($byMonthDayResults, $byDayResults);
-        } elseif ($this->byMonthDay) {
-            $result = $byMonthDayResults;
-        } else {
-            $result = $byDayResults;
-        }
-        $result = array_unique($result);
-        sort($result, SORT_NUMERIC);
-
-        // The last thing that needs checking is the BYSETPOS. If it's set, it
-        // means only certain items in the set survive the filter.
-        if (!$this->bySetPos) {
-            return $result;
-        }
-
-        $filteredResult = array();
-        foreach($this->bySetPos as $setPos) {
-
-            if ($setPos<0) {
-                $setPos = count($result)-($setPos+1);
-            }
-            if (isset($result[$setPos-1])) {
-                $filteredResult[] = $result[$setPos-1];
-            }
-        }
-
-        sort($filteredResult, SORT_NUMERIC);
-        return $filteredResult;
-
-    }
-
-
-}
-
diff --git a/3rdparty/Sabre/VObject/Version.php b/3rdparty/Sabre/VObject/Version.php
deleted file mode 100755
index 9ee03d87118..00000000000
--- a/3rdparty/Sabre/VObject/Version.php
+++ /dev/null
@@ -1,24 +0,0 @@
-<?php
-
-/**
- * This class contains the version number for the VObject package
- *
- * @package Sabre
- * @subpackage VObject
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/)
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- */
-class Sabre_VObject_Version {
-
-    /**
-     * Full version number
-     */
-    const VERSION = '1.3.4';
-
-    /**
-     * Stability : alpha, beta, stable
-     */
-    const STABILITY = 'stable';
-
-}
diff --git a/3rdparty/Sabre/VObject/WindowsTimezoneMap.php b/3rdparty/Sabre/VObject/WindowsTimezoneMap.php
deleted file mode 100755
index 5e1cc5d479b..00000000000
--- a/3rdparty/Sabre/VObject/WindowsTimezoneMap.php
+++ /dev/null
@@ -1,128 +0,0 @@
-<?php
-
-/**
- * Time zone name translation
- *
- * This file translates well-known time zone names into "Olson database" time zone names.
- *
- * @package Sabre
- * @subpackage VObject 
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Frank Edelhaeuser (fedel@users.sourceforge.net) 
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- */
-class Sabre_VObject_WindowsTimezoneMap {
-
-    protected static $map = array(
-
-        // from http://unicode.org/repos/cldr-tmp/trunk/diff/supplemental/zone_tzid.html
-        // snapshot taken on 2012/01/16
-
-        // windows
-        'AUS Central Standard Time'=>'Australia/Darwin',
-        'AUS Eastern Standard Time'=>'Australia/Sydney',
-        'Afghanistan Standard Time'=>'Asia/Kabul',
-        'Alaskan Standard Time'=>'America/Anchorage',
-        'Arab Standard Time'=>'Asia/Riyadh',
-        'Arabian Standard Time'=>'Asia/Dubai',
-        'Arabic Standard Time'=>'Asia/Baghdad',
-        'Argentina Standard Time'=>'America/Buenos_Aires',
-        'Armenian Standard Time'=>'Asia/Yerevan',
-        'Atlantic Standard Time'=>'America/Halifax',
-        'Azerbaijan Standard Time'=>'Asia/Baku',
-        'Azores Standard Time'=>'Atlantic/Azores',
-        'Bangladesh Standard Time'=>'Asia/Dhaka',
-        'Canada Central Standard Time'=>'America/Regina',
-        'Cape Verde Standard Time'=>'Atlantic/Cape_Verde',
-        'Caucasus Standard Time'=>'Asia/Yerevan',
-        'Cen. Australia Standard Time'=>'Australia/Adelaide',
-        'Central America Standard Time'=>'America/Guatemala',
-        'Central Asia Standard Time'=>'Asia/Almaty',
-        'Central Brazilian Standard Time'=>'America/Cuiaba',
-        'Central Europe Standard Time'=>'Europe/Budapest',
-        'Central European Standard Time'=>'Europe/Warsaw',
-        'Central Pacific Standard Time'=>'Pacific/Guadalcanal',
-        'Central Standard Time'=>'America/Chicago',
-        'Central Standard Time (Mexico)'=>'America/Mexico_City',
-        'China Standard Time'=>'Asia/Shanghai',
-        'Dateline Standard Time'=>'Etc/GMT+12',
-        'E. Africa Standard Time'=>'Africa/Nairobi',
-        'E. Australia Standard Time'=>'Australia/Brisbane',
-        'E. Europe Standard Time'=>'Europe/Minsk',
-        'E. South America Standard Time'=>'America/Sao_Paulo',
-        'Eastern Standard Time'=>'America/New_York',
-        'Egypt Standard Time'=>'Africa/Cairo',
-        'Ekaterinburg Standard Time'=>'Asia/Yekaterinburg',
-        'FLE Standard Time'=>'Europe/Kiev',
-        'Fiji Standard Time'=>'Pacific/Fiji',
-        'GMT Standard Time'=>'Europe/London',
-        'GTB Standard Time'=>'Europe/Istanbul',
-        'Georgian Standard Time'=>'Asia/Tbilisi',
-        'Greenland Standard Time'=>'America/Godthab',
-        'Greenwich Standard Time'=>'Atlantic/Reykjavik',
-        'Hawaiian Standard Time'=>'Pacific/Honolulu',
-        'India Standard Time'=>'Asia/Calcutta',
-        'Iran Standard Time'=>'Asia/Tehran',
-        'Israel Standard Time'=>'Asia/Jerusalem',
-        'Jordan Standard Time'=>'Asia/Amman',
-        'Kamchatka Standard Time'=>'Asia/Kamchatka',
-        'Korea Standard Time'=>'Asia/Seoul',
-        'Magadan Standard Time'=>'Asia/Magadan',
-        'Mauritius Standard Time'=>'Indian/Mauritius',
-        'Mexico Standard Time'=>'America/Mexico_City',
-        'Mexico Standard Time 2'=>'America/Chihuahua',
-        'Mid-Atlantic Standard Time'=>'Etc/GMT+2',
-        'Middle East Standard Time'=>'Asia/Beirut',
-        'Montevideo Standard Time'=>'America/Montevideo',
-        'Morocco Standard Time'=>'Africa/Casablanca',
-        'Mountain Standard Time'=>'America/Denver',
-        'Mountain Standard Time (Mexico)'=>'America/Chihuahua',
-        'Myanmar Standard Time'=>'Asia/Rangoon',
-        'N. Central Asia Standard Time'=>'Asia/Novosibirsk',
-        'Namibia Standard Time'=>'Africa/Windhoek',
-        'Nepal Standard Time'=>'Asia/Katmandu',
-        'New Zealand Standard Time'=>'Pacific/Auckland',
-        'Newfoundland Standard Time'=>'America/St_Johns',
-        'North Asia East Standard Time'=>'Asia/Irkutsk',
-        'North Asia Standard Time'=>'Asia/Krasnoyarsk',
-        'Pacific SA Standard Time'=>'America/Santiago',
-        'Pacific Standard Time'=>'America/Los_Angeles',
-        'Pacific Standard Time (Mexico)'=>'America/Santa_Isabel',
-        'Pakistan Standard Time'=>'Asia/Karachi',
-        'Paraguay Standard Time'=>'America/Asuncion',
-        'Romance Standard Time'=>'Europe/Paris',
-        'Russian Standard Time'=>'Europe/Moscow',
-        'SA Eastern Standard Time'=>'America/Cayenne',
-        'SA Pacific Standard Time'=>'America/Bogota',
-        'SA Western Standard Time'=>'America/La_Paz',
-        'SE Asia Standard Time'=>'Asia/Bangkok',
-        'Samoa Standard Time'=>'Pacific/Apia',
-        'Singapore Standard Time'=>'Asia/Singapore',
-        'South Africa Standard Time'=>'Africa/Johannesburg',
-        'Sri Lanka Standard Time'=>'Asia/Colombo',
-        'Syria Standard Time'=>'Asia/Damascus',
-        'Taipei Standard Time'=>'Asia/Taipei',
-        'Tasmania Standard Time'=>'Australia/Hobart',
-        'Tokyo Standard Time'=>'Asia/Tokyo',
-        'Tonga Standard Time'=>'Pacific/Tongatapu',
-        'US Eastern Standard Time'=>'America/Indianapolis',
-        'US Mountain Standard Time'=>'America/Phoenix',
-        'UTC'=>'Etc/GMT',
-        'UTC+12'=>'Etc/GMT-12',
-        'UTC-02'=>'Etc/GMT+2',
-        'UTC-11'=>'Etc/GMT+11',
-        'Ulaanbaatar Standard Time'=>'Asia/Ulaanbaatar',
-        'Venezuela Standard Time'=>'America/Caracas',
-        'Vladivostok Standard Time'=>'Asia/Vladivostok',
-        'W. Australia Standard Time'=>'Australia/Perth',
-        'W. Central Africa Standard Time'=>'Africa/Lagos',
-        'W. Europe Standard Time'=>'Europe/Berlin',
-        'West Asia Standard Time'=>'Asia/Tashkent',
-        'West Pacific Standard Time'=>'Pacific/Port_Moresby',
-        'Yakutsk Standard Time'=>'Asia/Yakutsk',
-    );
-
-    static public function lookup($tzid) {
-        return isset(self::$map[$tzid]) ? self::$map[$tzid] : null;
-    }
-}
diff --git a/3rdparty/Sabre/VObject/includes.php b/3rdparty/Sabre/VObject/includes.php
deleted file mode 100755
index 0177a8f1ba6..00000000000
--- a/3rdparty/Sabre/VObject/includes.php
+++ /dev/null
@@ -1,41 +0,0 @@
-<?php
-
-/**
- * Sabre_VObject includes file
- *
- * Including this file will automatically include all files from the VObject
- * package.
- *
- * This often allows faster loadtimes, as autoload-speed is often quite slow.
- *
- * @package Sabre
- * @subpackage VObject
- * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
- * @author Evert Pot (http://www.rooftopsolutions.nl/)
- * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
- */
-
-// Begin includes
-include __DIR__ . '/DateTimeParser.php';
-include __DIR__ . '/ElementList.php';
-include __DIR__ . '/FreeBusyGenerator.php';
-include __DIR__ . '/Node.php';
-include __DIR__ . '/Parameter.php';
-include __DIR__ . '/ParseException.php';
-include __DIR__ . '/Reader.php';
-include __DIR__ . '/RecurrenceIterator.php';
-include __DIR__ . '/Version.php';
-include __DIR__ . '/WindowsTimezoneMap.php';
-include __DIR__ . '/Element.php';
-include __DIR__ . '/Property.php';
-include __DIR__ . '/Component.php';
-include __DIR__ . '/Property/DateTime.php';
-include __DIR__ . '/Property/MultiDateTime.php';
-include __DIR__ . '/Component/VAlarm.php';
-include __DIR__ . '/Component/VCalendar.php';
-include __DIR__ . '/Component/VEvent.php';
-include __DIR__ . '/Component/VJournal.php';
-include __DIR__ . '/Component/VTodo.php';
-include __DIR__ . '/Element/DateTime.php';
-include __DIR__ . '/Element/MultiDateTime.php';
-// End includes
diff --git a/3rdparty/Sabre/autoload.php b/3rdparty/Sabre/autoload.php
index c7b537d83d3..505bd36efb0 100755
--- a/3rdparty/Sabre/autoload.php
+++ b/3rdparty/Sabre/autoload.php
@@ -1,31 +1,27 @@
 <?php
 
 /**
- * SabreDAV's PHP autoloader
+ * SabreDAV's autoloader
  *
- * If you love the autoloader, and don't care as much about performance, this
- * file register a new autoload function using spl_autoload_register.
+ * This file is kept for backwards compatibility purposes.
+ * SabreDAV now uses the composer autoloader.
+ *
+ * You should stop including this file, and include 'vendor/autoload.php'
+ * instead.
  *
  * @package Sabre
  * @subpackage DAV
+ * @deprecated Will be removed in a future version!
  * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
  */
 
 /**
- * @param string $className
- * @return void
+ * We are assuming that the composer autoloader is just 2 directories up.
+ *
+ * This is not the case when sabredav is installed as a dependency. But, in
+ * those cases it's not expected that people will look for this file anyway.
  */
-function Sabre_autoload($className) {
-
-    if(strpos($className,'Sabre_')===0) {
-
-        include dirname(__FILE__) . '/' . str_replace('_','/',substr($className,6)) . '.php';
-
-    }
-
-}
-
-spl_autoload_register('Sabre_autoload');
 
+require __DIR__ . '/../../vendor/autoload.php';