--- /dev/null
+<?php
+/**
+ * Zend Framework (http://framework.zend.com/)
+ *
+ * @link http://github.com/zendframework/zf2 for the canonical source repository
+ * @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license http://framework.zend.com/license/new-bsd New BSD License
+ */
+
+namespace Zend\Feed\PubSubHubbub\Subscriber;
+
+use Zend\Feed\PubSubHubbub;
+use Zend\Feed\PubSubHubbub\Exception;
+use Zend\Feed\Uri;
+
+class Callback extends PubSubHubbub\AbstractCallback
+{
+ /**
+ * Contains the content of any feeds sent as updates to the Callback URL
+ *
+ * @var string
+ */
+ protected $feedUpdate = null;
+
+ /**
+ * Holds a manually set subscription key (i.e. identifies a unique
+ * subscription) which is typical when it is not passed in the query string
+ * but is part of the Callback URL path, requiring manual retrieval e.g.
+ * using a route and the \Zend\Mvc\Router\RouteMatch::getParam() method.
+ *
+ * @var string
+ */
+ protected $subscriptionKey = null;
+
+ /**
+ * After verification, this is set to the verified subscription's data.
+ *
+ * @var array
+ */
+ protected $currentSubscriptionData = null;
+
+ /**
+ * Set a subscription key to use for the current callback request manually.
+ * Required if usePathParameter is enabled for the Subscriber.
+ *
+ * @param string $key
+ * @return \Zend\Feed\PubSubHubbub\Subscriber\Callback
+ */
+ public function setSubscriptionKey($key)
+ {
+ $this->subscriptionKey = $key;
+ return $this;
+ }
+
+ /**
+ * Handle any callback from a Hub Server responding to a subscription or
+ * unsubscription request. This should be the Hub Server confirming the
+ * the request prior to taking action on it.
+ *
+ * @param array $httpGetData GET data if available and not in $_GET
+ * @param bool $sendResponseNow Whether to send response now or when asked
+ * @return void
+ */
+ public function handle(array $httpGetData = null, $sendResponseNow = false)
+ {
+ if ($httpGetData === null) {
+ $httpGetData = $_GET;
+ }
+
+ /**
+ * Handle any feed updates (sorry for the mess :P)
+ *
+ * This DOES NOT attempt to process a feed update. Feed updates
+ * SHOULD be validated/processed by an asynchronous process so as
+ * to avoid holding up responses to the Hub.
+ */
+ $contentType = $this->_getHeader('Content-Type');
+ if (strtolower($_SERVER['REQUEST_METHOD']) == 'post'
+ && $this->_hasValidVerifyToken(null, false)
+ && (stripos($contentType, 'application/atom+xml') === 0
+ || stripos($contentType, 'application/rss+xml') === 0
+ || stripos($contentType, 'application/xml') === 0
+ || stripos($contentType, 'text/xml') === 0
+ || stripos($contentType, 'application/rdf+xml') === 0)
+ ) {
+ $this->setFeedUpdate($this->_getRawBody());
+ $this->getHttpResponse()->setHeader('X-Hub-On-Behalf-Of', $this->getSubscriberCount());
+ /**
+ * Handle any (un)subscribe confirmation requests
+ */
+ } elseif ($this->isValidHubVerification($httpGetData)) {
+ $this->getHttpResponse()->setContent($httpGetData['hub_challenge']);
+
+ switch (strtolower($httpGetData['hub_mode'])) {
+ case 'subscribe':
+ $data = $this->currentSubscriptionData;
+ $data['subscription_state'] = PubSubHubbub\PubSubHubbub::SUBSCRIPTION_VERIFIED;
+ if (isset($httpGetData['hub_lease_seconds'])) {
+ $data['lease_seconds'] = $httpGetData['hub_lease_seconds'];
+ }
+ $this->getStorage()->setSubscription($data);
+ break;
+ case 'unsubscribe':
+ $verifyTokenKey = $this->_detectVerifyTokenKey($httpGetData);
+ $this->getStorage()->deleteSubscription($verifyTokenKey);
+ break;
+ default:
+ throw new Exception\RuntimeException(sprintf(
+ 'Invalid hub_mode ("%s") provided',
+ $httpGetData['hub_mode']
+ ));
+ }
+ /**
+ * Hey, C'mon! We tried everything else!
+ */
+ } else {
+ $this->getHttpResponse()->setStatusCode(404);
+ }
+
+ if ($sendResponseNow) {
+ $this->sendResponse();
+ }
+ }
+
+ /**
+ * Checks validity of the request simply by making a quick pass and
+ * confirming the presence of all REQUIRED parameters.
+ *
+ * @param array $httpGetData
+ * @return bool
+ */
+ public function isValidHubVerification(array $httpGetData)
+ {
+ /**
+ * As per the specification, the hub.verify_token is OPTIONAL. This
+ * implementation of Pubsubhubbub considers it REQUIRED and will
+ * always send a hub.verify_token parameter to be echoed back
+ * by the Hub Server. Therefore, its absence is considered invalid.
+ */
+ if (strtolower($_SERVER['REQUEST_METHOD']) !== 'get') {
+ return false;
+ }
+ $required = [
+ 'hub_mode',
+ 'hub_topic',
+ 'hub_challenge',
+ 'hub_verify_token',
+ ];
+ foreach ($required as $key) {
+ if (! array_key_exists($key, $httpGetData)) {
+ return false;
+ }
+ }
+ if ($httpGetData['hub_mode'] !== 'subscribe'
+ && $httpGetData['hub_mode'] !== 'unsubscribe'
+ ) {
+ return false;
+ }
+ if ($httpGetData['hub_mode'] == 'subscribe'
+ && ! array_key_exists('hub_lease_seconds', $httpGetData)
+ ) {
+ return false;
+ }
+ if (! Uri::factory($httpGetData['hub_topic'])->isValid()) {
+ return false;
+ }
+
+ /**
+ * Attempt to retrieve any Verification Token Key attached to Callback
+ * URL's path by our Subscriber implementation
+ */
+ if (! $this->_hasValidVerifyToken($httpGetData)) {
+ return false;
+ }
+ return true;
+ }
+
+ /**
+ * Sets a newly received feed (Atom/RSS) sent by a Hub as an update to a
+ * Topic we've subscribed to.
+ *
+ * @param string $feed
+ * @return \Zend\Feed\PubSubHubbub\Subscriber\Callback
+ */
+ public function setFeedUpdate($feed)
+ {
+ $this->feedUpdate = $feed;
+ return $this;
+ }
+
+ /**
+ * Check if any newly received feed (Atom/RSS) update was received
+ *
+ * @return bool
+ */
+ public function hasFeedUpdate()
+ {
+ if ($this->feedUpdate === null) {
+ return false;
+ }
+ return true;
+ }
+
+ /**
+ * Gets a newly received feed (Atom/RSS) sent by a Hub as an update to a
+ * Topic we've subscribed to.
+ *
+ * @return string
+ */
+ public function getFeedUpdate()
+ {
+ return $this->feedUpdate;
+ }
+
+ /**
+ * Check for a valid verify_token. By default attempts to compare values
+ * with that sent from Hub, otherwise merely ascertains its existence.
+ *
+ * @param array $httpGetData
+ * @param bool $checkValue
+ * @return bool
+ */
+ // @codingStandardsIgnoreStart
+ protected function _hasValidVerifyToken(array $httpGetData = null, $checkValue = true)
+ {
+ // @codingStandardsIgnoreEnd
+ $verifyTokenKey = $this->_detectVerifyTokenKey($httpGetData);
+ if (empty($verifyTokenKey)) {
+ return false;
+ }
+ $verifyTokenExists = $this->getStorage()->hasSubscription($verifyTokenKey);
+ if (! $verifyTokenExists) {
+ return false;
+ }
+ if ($checkValue) {
+ $data = $this->getStorage()->getSubscription($verifyTokenKey);
+ $verifyToken = $data['verify_token'];
+ if ($verifyToken !== hash('sha256', $httpGetData['hub_verify_token'])) {
+ return false;
+ }
+ $this->currentSubscriptionData = $data;
+ return true;
+ }
+ return true;
+ }
+
+ /**
+ * Attempt to detect the verification token key. This would be passed in
+ * the Callback URL (which we are handling with this class!) as a URI
+ * path part (the last part by convention).
+ *
+ * @param null|array $httpGetData
+ * @return false|string
+ */
+ // @codingStandardsIgnoreStart
+ protected function _detectVerifyTokenKey(array $httpGetData = null)
+ {
+ // @codingStandardsIgnoreEnd
+ /**
+ * Available when sub keys encoding in Callback URL path
+ */
+ if (isset($this->subscriptionKey)) {
+ return $this->subscriptionKey;
+ }
+
+ /**
+ * Available only if allowed by PuSH 0.2 Hubs
+ */
+ if (is_array($httpGetData)
+ && isset($httpGetData['xhub_subscription'])
+ ) {
+ return $httpGetData['xhub_subscription'];
+ }
+
+ /**
+ * Available (possibly) if corrupted in transit and not part of $_GET
+ */
+ $params = $this->_parseQueryString();
+ if (isset($params['xhub.subscription'])) {
+ return rawurldecode($params['xhub.subscription']);
+ }
+
+ return false;
+ }
+
+ /**
+ * Build an array of Query String parameters.
+ * This bypasses $_GET which munges parameter names and cannot accept
+ * multiple parameters with the same key.
+ *
+ * @return array|void
+ */
+ // @codingStandardsIgnoreStart
+ protected function _parseQueryString()
+ {
+ // @codingStandardsIgnoreEnd
+ $params = [];
+ $queryString = '';
+ if (isset($_SERVER['QUERY_STRING'])) {
+ $queryString = $_SERVER['QUERY_STRING'];
+ }
+ if (empty($queryString)) {
+ return [];
+ }
+ $parts = explode('&', $queryString);
+ foreach ($parts as $kvpair) {
+ $pair = explode('=', $kvpair);
+ $key = rawurldecode($pair[0]);
+ $value = rawurldecode($pair[1]);
+ if (isset($params[$key])) {
+ if (is_array($params[$key])) {
+ $params[$key][] = $value;
+ } else {
+ $params[$key] = [$params[$key], $value];
+ }
+ } else {
+ $params[$key] = $value;
+ }
+ }
+ return $params;
+ }
+}
projects / yaffs-website / blobdiff