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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Feed
* @copyright Copyright (c) 2005-2007 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id$
*/
/**
* @see Zend_Feed_Entry_Abstract
*/
require_once 'Zend/Feed/Entry/Abstract.php';
/**
* Concrete class for working with Atom entries.
*
* @category Zend
* @package Zend_Feed
* @copyright Copyright (c) 2005-2007 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Feed_Entry_Atom extends Zend_Feed_Entry_Abstract
{
/**
* Root XML element for Atom entries.
*
* @var string
*/
protected $_rootElement = 'entry';
/**
* Root namespace for Atom entries.
*
* @var string
*/
protected $_rootNamespace = 'atom';
/**
* Delete an atom entry.
*
* Delete tries to delete this entry from its feed. If the entry
* does not contain a link rel="edit", we throw an error (either
* the entry does not yet exist or this is not an editable
* feed). If we have a link rel="edit", we do the empty-body
* HTTP DELETE to that URI and check for a response of 2xx.
* Usually the response would be 204 No Content, but the Atom
* Publishing Protocol permits it to be 200 OK.
*
* @throws Zend_Feed_Exception
* @return void
*/
public function delete()
{
// Look for link rel="edit" in the entry object.
$deleteUri = $this->link('edit');
if (!$deleteUri) {
throw new Zend_Feed_Exception('Cannot delete entry; no link rel="edit" is present.');
}
// DELETE
$client = Zend_Feed::getHttpClient();
do {
$client->setUri($deleteUri);
if (Zend_Feed::getHttpMethodOverride()) {
$client->setHeader('X-HTTP-Method-Override', 'DELETE');
$response = $client->request('POST');
} else {
$response = $client->request('DELETE');
}
$httpStatus = $response->getStatus();
switch ((int) $httpStatus / 100) {
// Success
case 2:
return true;
// Redirect
case 3:
$deleteUri = $response->getHeader('Location');
continue;
// Error
default:
throw new Zend_Feed_Exception("Expected response code 2xx, got $httpStatus");
}
} while (true);
}
/**
* Save a new or updated Atom entry.
*
* Save is used to either create new entries or to save changes to
* existing ones. If we have a link rel="edit", we are changing
* an existing entry. In this case we re-serialize the entry and
* PUT it to the edit URI, checking for a 200 OK result.
*
* For posting new entries, you must specify the $postUri
* parameter to save() to tell the object where to post itself.
* We use $postUri and POST the serialized entry there, checking
* for a 201 Created response. If the insert is successful, we
* then parse the response from the POST to get any values that
* the server has generated: an id, an updated time, and its new
* link rel="edit".
*
* @param string $postUri Location to POST for creating new entries.
* @throws Zend_Feed_Exception
* @return void
*/
public function save($postUri = null)
{
if ($this->id()) {
// If id is set, look for link rel="edit" in the
// entry object and PUT.
$editUri = $this->link('edit');
if (!$editUri) {
throw new Zend_Feed_Exception('Cannot edit entry; no link rel="edit" is present.');
}
$client = Zend_Feed::getHttpClient();
$client->setUri($editUri);
if (Zend_Feed::getHttpMethodOverride()) {
$client->setHeaders(array('X-HTTP-Method-Override: PUT',
'Content-Type: application/atom+xml'));
$client->setRawData($this->saveXML());
$response = $client->request('POST');
} else {
$client->setHeaders('Content-Type', 'application/atom+xml');
$client->setRawData($this->saveXML());
$response = $client->request('PUT');
}
if ($response->getStatus() !== 200) {
throw new Zend_Feed_Exception('Expected response code 200, got ' . $response->getStatus());
}
} else {
if ($postUri === null) {
throw new Zend_Feed_Exception('PostURI must be specified to save new entries.');
}
$client = Zend_Feed::getHttpClient();
$client->setUri($postUri);
$client->setRawData($this->saveXML());
$response = $client->request('POST');
if ($response->getStatus() !== 201) {
throw new Zend_Feed_Exception('Expected response code 201, got '
. $response->getStatus());
}
}
// Update internal properties using $client->responseBody;
@ini_set('track_errors', 1);
$newEntry = @DOMDocument::loadXML($response->getBody());
@ini_restore('track_errors');
if (!$newEntry) {
throw new Zend_Feed_Exception('XML cannot be parsed: ' . $php_errormsg);
}
$newEntry = $newEntry->getElementsByTagName($this->_rootElement)->item(0);
if (!$newEntry) {
throw new Zend_Feed_Exception('No root <feed> element found in server response:'
. "\n\n" . $client->responseBody);
}
if ($this->_element->parentNode) {
$oldElement = $this->_element;
$this->_element = $oldElement->ownerDocument->importNode($newEntry, true);
$oldElement->parentNode->replaceChild($this->_element, $oldElement);
} else {
$this->_element = $newEntry;
}
}
/**
* Easy access to <link> tags keyed by "rel" attributes.
*
* If $elt->link() is called with no arguments, we will attempt to
* return the value of the <link> tag(s) like all other
* method-syntax attribute access. If an argument is passed to
* link(), however, then we will return the "href" value of the
* first <link> tag that has a "rel" attribute matching $rel:
*
* $elt->link(): returns the value of the link tag.
* $elt->link('self'): returns the href from the first <link rel="self"> in the entry.
*
* @param string $rel The "rel" attribute to look for.
* @return mixed
*/
public function link($rel = null)
{
if ($rel === null) {
return parent::__call('link', null);
}
// index link tags by their "rel" attribute.
$links = parent::__get('link');
if (!is_array($links)) {
if ($links instanceof Zend_Feed_Element) {
$links = array($links);
} else {
return $links;
}
}
foreach ($links as $link) {
if (empty($link['rel'])) {
continue;
}
if ($rel == $link['rel']) {
return $link['href'];
}
}
return null;
}
}
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