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Diffstat (limited to 'libs/Zend/Feed/Pubsubhubbub/Subscriber.php')
| -rw-r--r-- | libs/Zend/Feed/Pubsubhubbub/Subscriber.php | 856 |
1 files changed, 856 insertions, 0 deletions
diff --git a/libs/Zend/Feed/Pubsubhubbub/Subscriber.php b/libs/Zend/Feed/Pubsubhubbub/Subscriber.php new file mode 100644 index 0000000000..9921bce594 --- /dev/null +++ b/libs/Zend/Feed/Pubsubhubbub/Subscriber.php @@ -0,0 +1,856 @@ +<?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_Pubsubhubbub + * @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com) + * @license http://framework.zend.com/license/new-bsd New BSD License + */ + +/** + * @see Zend_Feed_Pubsubhubbub + */ +// require_once 'Zend/Feed/Pubsubhubbub.php'; + +/** + * @see Zend_Date + */ +// require_once 'Zend/Date.php'; + +/** + * @category Zend + * @package Zend_Feed_Pubsubhubbub + * @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com) + * @license http://framework.zend.com/license/new-bsd New BSD License + */ +class Zend_Feed_Pubsubhubbub_Subscriber +{ + /** + * An array of URLs for all Hub Servers to subscribe/unsubscribe. + * + * @var array + */ + protected $_hubUrls = array(); + + /** + * An array of optional parameters to be included in any + * (un)subscribe requests. + * + * @var array + */ + protected $_parameters = array(); + + /** + * The URL of the topic (Rss or Atom feed) which is the subject of + * our current intent to subscribe to/unsubscribe from updates from + * the currently configured Hub Servers. + * + * @var string + */ + protected $_topicUrl = ''; + + /** + * The URL Hub Servers must use when communicating with this Subscriber + * + * @var string + */ + protected $_callbackUrl = ''; + + /** + * The number of seconds for which the subscriber would like to have the + * subscription active. Defaults to null, i.e. not sent, to setup a + * permanent subscription if possible. + * + * @var int + */ + protected $_leaseSeconds = null; + + /** + * The preferred verification mode (sync or async). By default, this + * Subscriber prefers synchronous verification, but is considered + * desireable to support asynchronous verification if possible. + * + * Zend_Feed_Pubsubhubbub_Subscriber will always send both modes, whose + * order of occurance in the parameter list determines this preference. + * + * @var string + */ + protected $_preferredVerificationMode + = Zend_Feed_Pubsubhubbub::VERIFICATION_MODE_SYNC; + + /** + * An array of any errors including keys for 'response', 'hubUrl'. + * The response is the actual Zend_Http_Response object. + * + * @var array + */ + protected $_errors = array(); + + /** + * An array of Hub Server URLs for Hubs operating at this time in + * asynchronous verification mode. + * + * @var array + */ + protected $_asyncHubs = array(); + + /** + * An instance of Zend_Feed_Pubsubhubbub_Model_SubscriptionInterface used to background + * save any verification tokens associated with a subscription or other. + * + * @var Zend_Feed_Pubsubhubbub_Model_SubscriptionInterface + */ + protected $_storage = null; + + /** + * An array of authentication credentials for HTTP Basic Authentication + * if required by specific Hubs. The array is indexed by Hub Endpoint URI + * and the value is a simple array of the username and password to apply. + * + * @var array + */ + protected $_authentications = array(); + + /** + * Tells the Subscriber to append any subscription identifier to the path + * of the base Callback URL. E.g. an identifier "subkey1" would be added + * to the callback URL "http://www.example.com/callback" to create a subscription + * specific Callback URL of "http://www.example.com/callback/subkey1". + * + * This is required for all Hubs using the Pubsubhubbub 0.1 Specification. + * It should be manually intercepted and passed to the Callback class using + * Zend_Feed_Pubsubhubbub_Subscriber_Callback::setSubscriptionKey(). Will + * require a route in the form "callback/:subkey" to allow the parameter be + * retrieved from an action using the Zend_Controller_Action::_getParam() + * method. + * + * @var string + */ + protected $_usePathParameter = false; + + /** + * Constructor; accepts an array or Zend_Config instance to preset + * options for the Subscriber without calling all supported setter + * methods in turn. + * + * @param array|Zend_Config $options Options array or Zend_Config instance + * @return void + */ + public function __construct($config = null) + { + if (!is_null($config)) { + $this->setConfig($config); + } + } + + /** + * Process any injected configuration options + * + * @param array|Zend_Config $options Options array or Zend_Config instance + * @return Zend_Feed_Pubsubhubbub_Subscriber + */ + public function setConfig($config) + { + if ($config instanceof Zend_Config) { + $config = $config->toArray(); + } elseif (!is_array($config)) { + // require_once 'Zend/Feed/Pubsubhubbub/Exception.php'; + throw new Zend_Feed_Pubsubhubbub_Exception('Array or Zend_Config object' + . ' expected, got ' . gettype($config)); + } + if (array_key_exists('hubUrls', $config)) { + $this->addHubUrls($config['hubUrls']); + } + if (array_key_exists('callbackUrl', $config)) { + $this->setCallbackUrl($config['callbackUrl']); + } + if (array_key_exists('topicUrl', $config)) { + $this->setTopicUrl($config['topicUrl']); + } + if (array_key_exists('storage', $config)) { + $this->setStorage($config['storage']); + } + if (array_key_exists('leaseSeconds', $config)) { + $this->setLeaseSeconds($config['leaseSeconds']); + } + if (array_key_exists('parameters', $config)) { + $this->setParameters($config['parameters']); + } + if (array_key_exists('authentications', $config)) { + $this->addAuthentications($config['authentications']); + } + if (array_key_exists('usePathParameter', $config)) { + $this->usePathParameter($config['usePathParameter']); + } + if (array_key_exists('preferredVerificationMode', $config)) { + $this->setPreferredVerificationMode( + $config['preferredVerificationMode'] + ); + } + return $this; + } + + /** + * Set the topic URL (RSS or Atom feed) to which the intended (un)subscribe + * event will relate + * + * @param string $url + * @return Zend_Feed_Pubsubhubbub_Subscriber + */ + public function setTopicUrl($url) + { + if (empty($url) || !is_string($url) || !Zend_Uri::check($url)) { + // require_once 'Zend/Feed/Pubsubhubbub/Exception.php'; + throw new Zend_Feed_Pubsubhubbub_Exception('Invalid parameter "url"' + .' of "' . $url . '" must be a non-empty string and a valid' + .' URL'); + } + $this->_topicUrl = $url; + return $this; + } + + /** + * Set the topic URL (RSS or Atom feed) to which the intended (un)subscribe + * event will relate + * + * @return string + */ + public function getTopicUrl() + { + if (empty($this->_topicUrl)) { + // require_once 'Zend/Feed/Pubsubhubbub/Exception.php'; + throw new Zend_Feed_Pubsubhubbub_Exception('A valid Topic (RSS or Atom' + . ' feed) URL MUST be set before attempting any operation'); + } + return $this->_topicUrl; + } + + /** + * Set the number of seconds for which any subscription will remain valid + * + * @param int $seconds + * @return Zend_Feed_Pubsubhubbub_Subscriber + */ + public function setLeaseSeconds($seconds) + { + $seconds = intval($seconds); + if ($seconds <= 0) { + // require_once 'Zend/Feed/Pubsubhubbub/Exception.php'; + throw new Zend_Feed_Pubsubhubbub_Exception('Expected lease seconds' + . ' must be an integer greater than zero'); + } + $this->_leaseSeconds = $seconds; + return $this; + } + + /** + * Get the number of lease seconds on subscriptions + * + * @return int + */ + public function getLeaseSeconds() + { + return $this->_leaseSeconds; + } + + /** + * Set the callback URL to be used by Hub Servers when communicating with + * this Subscriber + * + * @param string $url + * @return Zend_Feed_Pubsubhubbub_Subscriber + */ + public function setCallbackUrl($url) + { + if (empty($url) || !is_string($url) || !Zend_Uri::check($url)) { + // require_once 'Zend/Feed/Pubsubhubbub/Exception.php'; + throw new Zend_Feed_Pubsubhubbub_Exception('Invalid parameter "url"' + . ' of "' . $url . '" must be a non-empty string and a valid' + . ' URL'); + } + $this->_callbackUrl = $url; + return $this; + } + + /** + * Get the callback URL to be used by Hub Servers when communicating with + * this Subscriber + * + * @return string + */ + public function getCallbackUrl() + { + if (empty($this->_callbackUrl)) { + // require_once 'Zend/Feed/Pubsubhubbub/Exception.php'; + throw new Zend_Feed_Pubsubhubbub_Exception('A valid Callback URL MUST be' + . ' set before attempting any operation'); + } + return $this->_callbackUrl; + } + + /** + * Set preferred verification mode (sync or async). By default, this + * Subscriber prefers synchronous verification, but does support + * asynchronous if that's the Hub Server's utilised mode. + * + * Zend_Feed_Pubsubhubbub_Subscriber will always send both modes, whose + * order of occurance in the parameter list determines this preference. + * + * @param string $mode Should be 'sync' or 'async' + * @return Zend_Feed_Pubsubhubbub_Subscriber + */ + public function setPreferredVerificationMode($mode) + { + if ($mode !== Zend_Feed_Pubsubhubbub::VERIFICATION_MODE_SYNC + && $mode !== Zend_Feed_Pubsubhubbub::VERIFICATION_MODE_ASYNC) { + // require_once 'Zend/Feed/Pubsubhubbub/Exception.php'; + throw new Zend_Feed_Pubsubhubbub_Exception('Invalid preferred' + . ' mode specified: "' . $mode . '" but should be one of' + . ' Zend_Feed_Pubsubhubbub::VERIFICATION_MODE_SYNC or' + . ' Zend_Feed_Pubsubhubbub::VERIFICATION_MODE_ASYNC'); + } + $this->_preferredVerificationMode = $mode; + return $this; + } + + /** + * Get preferred verification mode (sync or async). + * + * @return string + */ + public function getPreferredVerificationMode() + { + return $this->_preferredVerificationMode; + } + + /** + * Add a Hub Server URL supported by Publisher + * + * @param string $url + * @return Zend_Feed_Pubsubhubbub_Subscriber + */ + public function addHubUrl($url) + { + if (empty($url) || !is_string($url) || !Zend_Uri::check($url)) { + // require_once 'Zend/Feed/Pubsubhubbub/Exception.php'; + throw new Zend_Feed_Pubsubhubbub_Exception('Invalid parameter "url"' + . ' of "' . $url . '" must be a non-empty string and a valid' + . ' URL'); + } + $this->_hubUrls[] = $url; + return $this; + } + + /** + * Add an array of Hub Server URLs supported by Publisher + * + * @param array $urls + * @return Zend_Feed_Pubsubhubbub_Subscriber + */ + public function addHubUrls(array $urls) + { + foreach ($urls as $url) { + $this->addHubUrl($url); + } + return $this; + } + + /** + * Remove a Hub Server URL + * + * @param string $url + * @return Zend_Feed_Pubsubhubbub_Subscriber + */ + public function removeHubUrl($url) + { + if (!in_array($url, $this->getHubUrls())) { + return $this; + } + $key = array_search($url, $this->_hubUrls); + unset($this->_hubUrls[$key]); + return $this; + } + + /** + * Return an array of unique Hub Server URLs currently available + * + * @return array + */ + public function getHubUrls() + { + $this->_hubUrls = array_unique($this->_hubUrls); + return $this->_hubUrls; + } + + /** + * Add authentication credentials for a given URL + * + * @param string $url + * @param array $authentication + * @return Zend_Feed_Pubsubhubbub_Subscriber + */ + public function addAuthentication($url, array $authentication) + { + if (empty($url) || !is_string($url) || !Zend_Uri::check($url)) { + // require_once 'Zend/Feed/Pubsubhubbub/Exception.php'; + throw new Zend_Feed_Pubsubhubbub_Exception('Invalid parameter "url"' + . ' of "' . $url . '" must be a non-empty string and a valid' + . ' URL'); + } + $this->_authentications[$url] = $authentication; + return $this; + } + + /** + * Add authentication credentials for hub URLs + * + * @param array $authentications + * @return Zend_Feed_Pubsubhubbub_Subscriber + */ + public function addAuthentications(array $authentications) + { + foreach ($authentications as $url => $authentication) { + $this->addAuthentication($url, $authentication); + } + return $this; + } + + /** + * Get all hub URL authentication credentials + * + * @return array + */ + public function getAuthentications() + { + return $this->_authentications; + } + + /** + * Set flag indicating whether or not to use a path parameter + * + * @param bool $bool + * @return Zend_Feed_Pubsubhubbub_Subscriber + */ + public function usePathParameter($bool = true) + { + $this->_usePathParameter = $bool; + return $this; + } + + /** + * Add an optional parameter to the (un)subscribe requests + * + * @param string $name + * @param string|null $value + * @return Zend_Feed_Pubsubhubbub_Subscriber + */ + public function setParameter($name, $value = null) + { + if (is_array($name)) { + $this->setParameters($name); + return $this; + } + if (empty($name) || !is_string($name)) { + // require_once 'Zend/Feed/Pubsubhubbub/Exception.php'; + throw new Zend_Feed_Pubsubhubbub_Exception('Invalid parameter "name"' + . ' of "' . $name . '" must be a non-empty string'); + } + if ($value === null) { + $this->removeParameter($name); + return $this; + } + if (empty($value) || (!is_string($value) && !is_null($value))) { + // require_once 'Zend/Feed/Pubsubhubbub/Exception.php'; + throw new Zend_Feed_Pubsubhubbub_Exception('Invalid parameter "value"' + . ' of "' . $value . '" must be a non-empty string'); + } + $this->_parameters[$name] = $value; + return $this; + } + + /** + * Add an optional parameter to the (un)subscribe requests + * + * @param string $name + * @param string|null $value + * @return Zend_Feed_Pubsubhubbub_Subscriber + */ + public function setParameters(array $parameters) + { + foreach ($parameters as $name => $value) { + $this->setParameter($name, $value); + } + return $this; + } + + /** + * Remove an optional parameter for the (un)subscribe requests + * + * @param string $name + * @return Zend_Feed_Pubsubhubbub_Subscriber + */ + public function removeParameter($name) + { + if (empty($name) || !is_string($name)) { + // require_once 'Zend/Feed/Pubsubhubbub/Exception.php'; + throw new Zend_Feed_Pubsubhubbub_Exception('Invalid parameter "name"' + . ' of "' . $name . '" must be a non-empty string'); + } + if (array_key_exists($name, $this->_parameters)) { + unset($this->_parameters[$name]); + } + return $this; + } + + /** + * Return an array of optional parameters for (un)subscribe requests + * + * @return array + */ + public function getParameters() + { + return $this->_parameters; + } + + /** + * Sets an instance of Zend_Feed_Pubsubhubbub_Model_SubscriptionInterface used to background + * save any verification tokens associated with a subscription or other. + * + * @param Zend_Feed_Pubsubhubbub_Model_SubscriptionInterface $storage + * @return Zend_Feed_Pubsubhubbub_Subscriber + */ + public function setStorage(Zend_Feed_Pubsubhubbub_Model_SubscriptionInterface $storage) + { + $this->_storage = $storage; + return $this; + } + + /** + * Gets an instance of Zend_Feed_Pubsubhubbub_Storage_StorageInterface used + * to background save any verification tokens associated with a subscription + * or other. + * + * @return Zend_Feed_Pubsubhubbub_Model_SubscriptionInterface + */ + public function getStorage() + { + if ($this->_storage === null) { + // require_once 'Zend/Feed/Pubsubhubbub/Exception.php'; + throw new Zend_Feed_Pubsubhubbub_Exception('No storage vehicle ' + . 'has been set.'); + } + return $this->_storage; + } + + /** + * Subscribe to one or more Hub Servers using the stored Hub URLs + * for the given Topic URL (RSS or Atom feed) + * + * @return void + */ + public function subscribeAll() + { + return $this->_doRequest('subscribe'); + } + + /** + * Unsubscribe from one or more Hub Servers using the stored Hub URLs + * for the given Topic URL (RSS or Atom feed) + * + * @return void + */ + public function unsubscribeAll() + { + return $this->_doRequest('unsubscribe'); + } + + /** + * Returns a boolean indicator of whether the notifications to Hub + * Servers were ALL successful. If even one failed, FALSE is returned. + * + * @return bool + */ + public function isSuccess() + { + if (count($this->_errors) > 0) { + return false; + } + return true; + } + + /** + * Return an array of errors met from any failures, including keys: + * 'response' => the Zend_Http_Response object from the failure + * 'hubUrl' => the URL of the Hub Server whose notification failed + * + * @return array + */ + public function getErrors() + { + return $this->_errors; + } + + /** + * Return an array of Hub Server URLs who returned a response indicating + * operation in Asynchronous Verification Mode, i.e. they will not confirm + * any (un)subscription immediately but at a later time (Hubs may be + * doing this as a batch process when load balancing) + * + * @return array + */ + public function getAsyncHubs() + { + return $this->_asyncHubs; + } + + /** + * Executes an (un)subscribe request + * + * @param string $mode + * @return void + */ + protected function _doRequest($mode) + { + $client = $this->_getHttpClient(); + $hubs = $this->getHubUrls(); + if (empty($hubs)) { + // require_once 'Zend/Feed/Pubsubhubbub/Exception.php'; + throw new Zend_Feed_Pubsubhubbub_Exception('No Hub Server URLs' + . ' have been set so no subscriptions can be attempted'); + } + $this->_errors = array(); + $this->_asyncHubs = array(); + foreach ($hubs as $url) { + if (array_key_exists($url, $this->_authentications)) { + $auth = $this->_authentications[$url]; + $client->setAuth($auth[0], $auth[1]); + } + $client->setUri($url); + $client->setRawData($this->_getRequestParameters($url, $mode)); + $response = $client->request(); + if ($response->getStatus() !== 204 + && $response->getStatus() !== 202 + ) { + $this->_errors[] = array( + 'response' => $response, + 'hubUrl' => $url, + ); + /** + * At first I thought it was needed, but the backend storage will + * allow tracking async without any user interference. It's left + * here in case the user is interested in knowing what Hubs + * are using async verification modes so they may update Models and + * move these to asynchronous processes. + */ + } elseif ($response->getStatus() == 202) { + $this->_asyncHubs[] = array( + 'response' => $response, + 'hubUrl' => $url, + ); + } + } + } + + /** + * Get a basic prepared HTTP client for use + * + * @param string $mode Must be "subscribe" or "unsubscribe" + * @return Zend_Http_Client + */ + protected function _getHttpClient() + { + $client = Zend_Feed_Pubsubhubbub::getHttpClient(); + $client->setMethod(Zend_Http_Client::POST); + $client->setConfig(array('useragent' => 'Zend_Feed_Pubsubhubbub_Subscriber/' + . Zend_Version::VERSION)); + return $client; + } + + /** + * Return a list of standard protocol/optional parameters for addition to + * client's POST body that are specific to the current Hub Server URL + * + * @param string $hubUrl + * @param mode $hubUrl + * @return string + */ + protected function _getRequestParameters($hubUrl, $mode) + { + if (!in_array($mode, array('subscribe', 'unsubscribe'))) { + // require_once 'Zend/Feed/Pubsubhubbub/Exception.php'; + throw new Zend_Feed_Pubsubhubbub_Exception('Invalid mode specified: "' + . $mode . '" which should have been "subscribe" or "unsubscribe"'); + } + + $params = array( + 'hub.mode' => $mode, + 'hub.topic' => $this->getTopicUrl(), + ); + + if ($this->getPreferredVerificationMode() + == Zend_Feed_Pubsubhubbub::VERIFICATION_MODE_SYNC + ) { + $vmodes = array( + Zend_Feed_Pubsubhubbub::VERIFICATION_MODE_SYNC, + Zend_Feed_Pubsubhubbub::VERIFICATION_MODE_ASYNC, + ); + } else { + $vmodes = array( + Zend_Feed_Pubsubhubbub::VERIFICATION_MODE_ASYNC, + Zend_Feed_Pubsubhubbub::VERIFICATION_MODE_SYNC, + ); + } + $params['hub.verify'] = array(); + foreach($vmodes as $vmode) { + $params['hub.verify'][] = $vmode; + } + + /** + * Establish a persistent verify_token and attach key to callback + * URL's path/querystring + */ + $key = $this->_generateSubscriptionKey($params, $hubUrl); + $token = $this->_generateVerifyToken(); + $params['hub.verify_token'] = $token; + + // Note: query string only usable with PuSH 0.2 Hubs + if (!$this->_usePathParameter) { + $params['hub.callback'] = $this->getCallbackUrl() + . '?xhub.subscription=' . Zend_Feed_Pubsubhubbub::urlencode($key); + } else { + $params['hub.callback'] = rtrim($this->getCallbackUrl(), '/') + . '/' . Zend_Feed_Pubsubhubbub::urlencode($key); + } + if ($mode == 'subscribe' && !is_null($this->getLeaseSeconds())) { + $params['hub.lease_seconds'] = $this->getLeaseSeconds(); + } + + // hub.secret not currently supported + $optParams = $this->getParameters(); + foreach ($optParams as $name => $value) { + $params[$name] = $value; + } + + // store subscription to storage + $now = new Zend_Date; + $expires = null; + if (isset($params['hub.lease_seconds'])) { + $expires = $now->add($params['hub.lease_seconds'], Zend_Date::SECOND) + ->get('yyyy-MM-dd HH:mm:ss'); + } + $data = array( + 'id' => $key, + 'topic_url' => $params['hub.topic'], + 'hub_url' => $hubUrl, + 'created_time' => $now->get('yyyy-MM-dd HH:mm:ss'), + 'lease_seconds' => $expires, + 'verify_token' => hash('sha256', $params['hub.verify_token']), + 'secret' => null, + 'expiration_time' => $expires, + 'subscription_state' => Zend_Feed_Pubsubhubbub::SUBSCRIPTION_NOTVERIFIED, + ); + $this->getStorage()->setSubscription($data); + + return $this->_toByteValueOrderedString( + $this->_urlEncode($params) + ); + } + + /** + * Simple helper to generate a verification token used in (un)subscribe + * requests to a Hub Server. Follows no particular method, which means + * it might be improved/changed in future. + * + * @param string $hubUrl The Hub Server URL for which this token will apply + * @return string + */ + protected function _generateVerifyToken() + { + if (!empty($this->_testStaticToken)) { + return $this->_testStaticToken; + } + return uniqid(rand(), true) . time(); + } + + /** + * Simple helper to generate a verification token used in (un)subscribe + * requests to a Hub Server. + * + * @param string $hubUrl The Hub Server URL for which this token will apply + * @return string + */ + protected function _generateSubscriptionKey(array $params, $hubUrl) + { + $keyBase = $params['hub.topic'] . $hubUrl; + $key = md5($keyBase); + return $key; + } + + /** + * URL Encode an array of parameters + * + * @param array $params + * @return array + */ + protected function _urlEncode(array $params) + { + $encoded = array(); + foreach ($params as $key => $value) { + if (is_array($value)) { + $ekey = Zend_Feed_Pubsubhubbub::urlencode($key); + $encoded[$ekey] = array(); + foreach ($value as $duplicateKey) { + $encoded[$ekey][] + = Zend_Feed_Pubsubhubbub::urlencode($duplicateKey); + } + } else { + $encoded[Zend_Feed_Pubsubhubbub::urlencode($key)] + = Zend_Feed_Pubsubhubbub::urlencode($value); + } + } + return $encoded; + } + + /** + * Order outgoing parameters + * + * @param array $params + * @return array + */ + protected function _toByteValueOrderedString(array $params) + { + $return = array(); + uksort($params, 'strnatcmp'); + foreach ($params as $key => $value) { + if (is_array($value)) { + foreach ($value as $keyduplicate) { + $return[] = $key . '=' . $keyduplicate; + } + } else { + $return[] = $key . '=' . $value; + } + } + return implode('&', $return); + } + + /** + * This is STRICTLY for testing purposes only... + */ + protected $_testStaticToken = null; + + final public function setTestStaticToken($token) + { + $this->_testStaticToken = (string) $token; + } +} |