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- <?php
- /*
- * StatusNet - the distributed open-source microblogging tool
- * Copyright (C) 2009-2010, StatusNet, Inc.
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
- if (!defined('GNUSOCIAL')) { exit(1); }
- /**
- * @package OStatusPlugin
- * @maintainer Brion Vibber <brion@status.net>
- */
- /*
- WebSub (previously PubSubHubbub/PuSH) subscription flow:
- $profile->subscribe()
- sends a sub request to the hub...
- main/push/callback
- hub sends confirmation back to us via GET
- We verify the request, then echo back the challenge.
- On our end, we save the time we subscribed and the lease expiration
- main/push/callback
- hub sends us updates via POST
- */
- /**
- * FeedSub handles low-level WebSub (PubSubHubbub/PuSH) subscriptions.
- * Higher-level behavior building OStatus stuff on top is handled
- * under Ostatus_profile.
- */
- class FeedSub extends Managed_DataObject
- {
- public $__table = 'feedsub';
- public $id;
- public $uri; // varchar(191) not 255 because utf8mb4 takes more space
- // WebSub subscription data
- public $huburi;
- public $secret;
- public $sub_state; // subscribe, active, unsubscribe, inactive, nohub
- public $sub_start;
- public $sub_end;
- public $last_update;
- public $created;
- public $modified;
- public static function schemaDef()
- {
- return array(
- 'fields' => array(
- 'id' => array('type' => 'serial', 'not null' => true, 'description' => 'FeedSub local unique id'),
- 'uri' => array('type' => 'varchar', 'not null' => true, 'length' => 191, 'description' => 'FeedSub uri'),
- 'huburi' => array('type' => 'text', 'description' => 'FeedSub hub-uri'),
- 'secret' => array('type' => 'text', 'description' => 'FeedSub stored secret'),
- 'sub_state' => array('type' => 'enum("subscribe","active","unsubscribe","inactive","nohub")', 'not null' => true, 'description' => 'subscription state'),
- 'sub_start' => array('type' => 'datetime', 'description' => 'subscription start'),
- 'sub_end' => array('type' => 'datetime', 'description' => 'subscription end'),
- 'last_update' => array('type' => 'datetime', 'description' => 'when this record was last updated'),
- 'created' => array('type' => 'datetime', 'not null' => true, 'description' => 'date this record was created'),
- 'modified' => array('type' => 'timestamp', 'not null' => true, 'description' => 'date this record was modified'),
- ),
- 'primary key' => array('id'),
- 'unique keys' => array(
- 'feedsub_uri_key' => array('uri'),
- ),
- );
- }
- /**
- * Get the feed uri (http/https)
- */
- public function getUri()
- {
- if (empty($this->uri)) {
- throw new NoUriException($this);
- }
- return $this->uri;
- }
- function getLeaseRemaining()
- {
- if (empty($this->sub_end)) {
- return null;
- }
- return strtotime($this->sub_end) - time();
- }
- /**
- * Do we have a hub? Then we are a WebSub feed.
- * WebSub standard: https://www.w3.org/TR/websub/
- * old: https://en.wikipedia.org/wiki/PubSubHubbub
- *
- * If huburi is empty, then doublecheck that we are not using
- * a fallback hub. If there is a fallback hub, it is only if the
- * sub_state is "nohub" that we assume it's not a WebSub feed.
- */
- public function isWebSub()
- {
- if (empty($this->huburi)
- && (!common_config('feedsub', 'fallback_hub')
- || $this->sub_state === 'nohub')) {
- // Here we have no huburi set. Also, either there is no
- // fallback hub configured or sub_state is "nohub".
- return false;
- }
- return true;
- }
- /**
- * Fetch the StatusNet-side profile for this feed
- * @return Profile
- */
- public function localProfile()
- {
- if ($this->profile_id) {
- return Profile::getKV('id', $this->profile_id);
- }
- return null;
- }
- /**
- * Fetch the StatusNet-side profile for this feed
- * @return Profile
- */
- public function localGroup()
- {
- if ($this->group_id) {
- return User_group::getKV('id', $this->group_id);
- }
- return null;
- }
- /**
- * @param string $feeduri
- * @return FeedSub
- * @throws FeedSubException if feed is invalid or lacks WebSub setup
- */
- public static function ensureFeed($feeduri)
- {
- $feedsub = self::getKV('uri', $feeduri);
- if ($feedsub instanceof FeedSub) {
- if (!empty($feedsub->huburi)) {
- // If there is already a huburi we don't
- // rediscover it on ensureFeed, call
- // ensureHub to do that (compare ->modified
- // to see if it might be time to do it).
- return $feedsub;
- }
- if ($feedsub->sub_state !== 'inactive') {
- throw new ServerException('Can only ensure WebSub hub for inactive (unsubscribed) feeds.');
- }
- // If huburi is empty we continue with ensureHub
- } else {
- // If we don't have that local feed URI
- // stored then we create a new DB object.
- $feedsub = new FeedSub();
- $feedsub->uri = $feeduri;
- $feedsub->sub_state = 'inactive';
- }
- try {
- // discover the hub uri
- $feedsub->ensureHub();
- } catch (FeedSubNoHubException $e) {
- // Only throw this exception if we can't handle huburi-less feeds
- // (i.e. we have a fallback hub or we can do feed polling (nohub)
- if (!common_config('feedsub', 'fallback_hub') && !common_config('feedsub', 'nohub')) {
- throw $e;
- }
- }
- if (empty($feedsub->id)) {
- // if $feedsub doesn't have an id we'll insert it into the db here
- $feedsub->created = common_sql_now();
- $feedsub->modified = common_sql_now();
- $result = $feedsub->insert();
- if ($result === false) {
- throw new FeedDBException($feedsub);
- }
- }
- return $feedsub;
- }
- /**
- * ensureHub will only do $this->update if !empty($this->id)
- * because otherwise the object has not been created yet.
- *
- * @param bool $rediscovered Whether the hub info is rediscovered (to avoid endless loop nesting)
- *
- * @return null if actively avoiding the database
- * int number of rows updated in the database (0 means untouched)
- *
- * @throws ServerException if something went wrong when updating the database
- * FeedSubNoHubException if no hub URL was discovered
- */
- public function ensureHub($rediscovered=false)
- {
- common_debug('Now inside ensureHub again, $rediscovered=='._ve($rediscovered));
- if ($this->sub_state !== 'inactive') {
- common_log(LOG_INFO, sprintf(__METHOD__ . ': Running hub discovery a possibly active feed in %s state for URI %s', _ve($this->sub_state), _ve($this->uri)));
- }
- $discover = new FeedDiscovery();
- $discover->discoverFromFeedURL($this->uri);
- $huburi = $discover->getHubLink();
- if (empty($huburi)) {
- // Will be caught and treated with if statements in regards to
- // fallback hub and feed polling (nohub) configuration.
- throw new FeedSubNoHubException();
- }
- // if we've already got a DB object stored, we want to UPDATE, not INSERT
- $orig = !empty($this->id) ? clone($this) : null;
- $old_huburi = $this->huburi; // most likely null if we're INSERTing
- $this->huburi = $huburi;
- if (!empty($this->id)) {
- common_debug(sprintf(__METHOD__ . ': Feed uri==%s huburi before=%s after=%s (identical==%s)', _ve($this->uri), _ve($old_huburi), _ve($this->huburi), _ve($old_huburi===$this->huburi)));
- $result = $this->update($orig);
- if ($result === false) {
- // TODO: Get a DB exception class going...
- common_debug('Database update failed for FeedSub id=='._ve($this->id).' with new huburi: '._ve($this->huburi));
- throw new ServerException('Database update failed for FeedSub.');
- }
- if (!$rediscovered) {
- $this->renew();
- }
- return $result;
- }
- return null; // we haven't done anything with the database
- }
- /**
- * Send a subscription request to the hub for this feed.
- * The hub will later send us a confirmation POST to /main/push/callback.
- *
- * @return void
- * @throws ServerException if feed state is not valid
- */
- public function subscribe($rediscovered=false)
- {
- if ($this->sub_state && $this->sub_state != 'inactive') {
- common_log(LOG_WARNING, sprintf('Attempting to (re)start WebSub subscription to %s in unexpected state %s', $this->getUri(), $this->sub_state));
- }
- if (!Event::handle('FeedSubscribe', array($this))) {
- // A plugin handled it
- return;
- }
- if (empty($this->huburi)) {
- if (common_config('feedsub', 'fallback_hub')) {
- // No native hub on this feed?
- // Use our fallback hub, which handles polling on our behalf.
- } else if (common_config('feedsub', 'nohub')) {
- // For this to actually work, we'll need some polling mechanism.
- // The FeedPoller plugin should take care of it.
- return;
- } else {
- // TRANS: Server exception.
- throw new ServerException(_m('Attempting to start WebSub subscription for feed with no hub.'));
- }
- }
- $this->doSubscribe('subscribe', $rediscovered);
- }
- /**
- * Send a WebSub unsubscription request to the hub for this feed.
- * The hub will later send us a confirmation POST to /main/push/callback.
- * Warning: this will cancel the subscription even if someone else in
- * the system is using it. Most callers will want garbageCollect() instead,
- * which confirms there's no uses left.
- *
- * @throws ServerException if feed state is not valid
- */
- public function unsubscribe() {
- if ($this->sub_state != 'active') {
- common_log(LOG_WARNING, sprintf('Attempting to (re)end WebSub subscription to %s in unexpected state %s', $this->getUri(), $this->sub_state));
- }
- if (!Event::handle('FeedUnsubscribe', array($this))) {
- // A plugin handled it
- return;
- }
- if (empty($this->huburi) && !common_config('feedsub', 'fallback_hub')) {
- /**
- * If the huburi is empty and we don't have a fallback hub,
- * there is nowhere we can send an unsubscribe to.
- *
- * A plugin should handle the FeedSub above and set the proper state
- * if there is no hub. (instead of 'nohub' it should be 'inactive' if
- * the instance has enabled feed polling for feeds that don't publish
- * WebSub/PuSH hubs. FeedPoller is a plugin which enables polling.
- *
- * Secondly, if we don't have the setting "nohub" enabled (i.e.)
- * we're ready to poll ourselves, there is something odd with the
- * database, such as a polling plugin that has been disabled.
- */
- if (!common_config('feedsub', 'nohub')) {
- // TRANS: Server exception.
- throw new ServerException(_m('Attempting to end WebSub subscription for feed with no hub.'));
- }
- return;
- }
- $this->doSubscribe('unsubscribe');
- }
- /**
- * Check if there are any active local uses of this feed, and if not then
- * make sure it's inactive, unsubscribing if necessary.
- *
- * @return boolean true if the subscription is now inactive, false if still active.
- * @throws NoProfileException in FeedSubSubscriberCount for missing Profile entries
- * @throws Exception if something goes wrong in unsubscribe() method
- */
- public function garbageCollect()
- {
- if ($this->sub_state == '' || $this->sub_state == 'inactive') {
- // No active WebSub subscription, we can just leave it be.
- return true;
- }
- // WebSub subscription is either active or in an indeterminate state.
- // Check if we're out of subscribers, and if so send an unsubscribe.
- $count = 0;
- Event::handle('FeedSubSubscriberCount', array($this, &$count));
- if ($count > 0) {
- common_log(LOG_INFO, __METHOD__ . ': ok, ' . $count . ' user(s) left for ' . $this->getUri());
- return false;
- }
- common_log(LOG_INFO, __METHOD__ . ': unsubscribing, no users left for ' . $this->getUri());
- // Unsubscribe throws various Exceptions on failure
- $this->unsubscribe();
- return true;
- }
- static public function renewalCheck()
- {
- $fs = new FeedSub();
- // the "" empty string check is because we historically haven't saved unsubscribed feeds as NULL
- $fs->whereAdd('sub_end IS NOT NULL AND sub_end!="" AND sub_end < NOW() + INTERVAL 1 day');
- if (!$fs->find()) { // find can be both false and 0, depending on why nothing was found
- throw new NoResultException($fs);
- }
- return $fs;
- }
- public function renew($rediscovered=false)
- {
- common_debug('FeedSub is being renewed for uri=='._ve($this->uri).' on huburi=='._ve($this->huburi));
- $this->subscribe($rediscovered);
- }
- /**
- * Setting to subscribe means it is _waiting_ to become active. This
- * cannot be done in a transaction because there is a chance that the
- * remote script we're calling (as in the case of PuSHpress) performs
- * the lookup _while_ we're POSTing data, which means the transaction
- * never completes (PushcallbackAction gets an 'inactive' state).
- *
- * @return boolean true when everything is ok (throws Exception on fail)
- * @throws Exception on failure, can be HTTPClient's or our own.
- */
- protected function doSubscribe($mode, $rediscovered=false)
- {
- $msg = null; // carries descriptive error message to enduser (no remote data strings!)
- $orig = clone($this);
- if ($mode == 'subscribe') {
- $this->secret = common_random_hexstr(32);
- }
- $this->sub_state = $mode;
- $this->update($orig);
- unset($orig);
- try {
- $callback = common_local_url('pushcallback', array('feed' => $this->id));
- $headers = array('Content-Type: application/x-www-form-urlencoded');
- $post = array('hub.mode' => $mode,
- 'hub.callback' => $callback,
- 'hub.verify' => 'async', // TODO: deprecated, remove when noone uses PuSH <0.4 (only 'async' method used there)
- 'hub.verify_token' => 'Deprecated-since-PuSH-0.4', // TODO: rm!
- 'hub.lease_seconds' => 2592000, // 3600*24*30, request approximately month long lease (may be changed by hub)
- 'hub.secret' => $this->secret,
- 'hub.topic' => $this->getUri());
- $client = new HTTPClient();
- if ($this->huburi) {
- $hub = $this->huburi;
- } else {
- if (common_config('feedsub', 'fallback_hub')) {
- $hub = common_config('feedsub', 'fallback_hub');
- if (common_config('feedsub', 'hub_user')) {
- $u = common_config('feedsub', 'hub_user');
- $p = common_config('feedsub', 'hub_pass');
- $client->setAuth($u, $p);
- }
- } else {
- throw new FeedSubException('Server could not find a usable WebSub hub.');
- }
- }
- $response = $client->post($hub, $headers, $post);
- $status = $response->getStatus();
- // WebSub specificed response status code
- if ($status == 202 || $status == 204) {
- common_log(LOG_INFO, __METHOD__ . ': sub req ok, awaiting verification callback');
- return;
- } else if ($status >= 200 && $status < 300) {
- common_log(LOG_ERR, __METHOD__ . ": sub req returned unexpected HTTP $status: " . $response->getBody());
- $msg = sprintf(_m("Unexpected HTTP status: %d"), $status);
- } else if ($status == 422 && !$rediscovered) {
- // Error code regarding something wrong in the data (it seems
- // that we're talking to a WebSub hub at least, so let's check
- // our own data to be sure we're not mistaken somehow, which
- // means rediscovering hub data (the boolean parameter means
- // we avoid running this part over and over and over and over):
- common_debug('Running ensureHub again due to 422 status, $rediscovered=='._ve($rediscovered));
- $discoveryResult = $this->ensureHub(true);
- common_debug('ensureHub is now done and its result was: '._ve($discoveryResult));
- } else {
- common_log(LOG_ERR, __METHOD__ . ": sub req failed with HTTP $status: " . $response->getBody());
- }
- } catch (Exception $e) {
- common_log(LOG_ERR, __METHOD__ . ": error \"{$e->getMessage()}\" hitting hub {$this->huburi} subscribing to {$this->getUri()}");
- // Reset the subscription state.
- $orig = clone($this);
- $this->sub_state = 'inactive';
- $this->update($orig);
- // Throw the Exception again.
- throw $e;
- }
- throw new ServerException("{$mode} request failed" . (!is_null($msg) ? " ($msg)" : '.'));
- }
- /**
- * Save WebSub subscription confirmation.
- * Sets approximate lease start and end times and finalizes state.
- *
- * @param int $lease_seconds provided hub.lease_seconds parameter, if given
- */
- public function confirmSubscribe($lease_seconds)
- {
- $original = clone($this);
- $this->sub_state = 'active';
- $this->sub_start = common_sql_date(time());
- if ($lease_seconds > 0) {
- $this->sub_end = common_sql_date(time() + $lease_seconds);
- } else {
- $this->sub_end = null; // Backwards compatibility to StatusNet (PuSH <0.4 supported permanent subs)
- }
- $this->modified = common_sql_now();
- common_debug(__METHOD__ . ': Updating sub state and metadata for '.$this->getUri());
- return $this->update($original);
- }
- /**
- * Save WebSub unsubscription confirmation.
- * Wipes active WebSub sub info and resets state.
- */
- public function confirmUnsubscribe()
- {
- $original = clone($this);
- // @fixme these should all be null, but DB_DataObject doesn't save null values...?????
- $this->secret = '';
- $this->sub_state = '';
- $this->sub_start = '';
- $this->sub_end = '';
- $this->modified = common_sql_now();
- return $this->update($original);
- }
- /**
- * Accept updates from a WebSub feed. If validated, this object and the
- * feed (as a DOMDocument) will be passed to the StartFeedSubHandleFeed
- * and EndFeedSubHandleFeed events for processing.
- *
- * Not guaranteed to be running in an immediate POST context; may be run
- * from a queue handler.
- *
- * Side effects: the feedsub record's lastupdate field will be updated
- * to the current time (not published time) if we got a legit update.
- *
- * @param string $post source of Atom or RSS feed
- * @param string $hmac X-Hub-Signature header, if present
- */
- public function receive($post, $hmac)
- {
- common_log(LOG_INFO, sprintf(__METHOD__.': packet for %s with HMAC %s', _ve($this->getUri()), _ve($hmac)));
- if (!in_array($this->sub_state, array('active', 'nohub'))) {
- common_log(LOG_ERR, sprintf(__METHOD__.': ignoring WebSub for inactive feed %s (in state %s)', _ve($this->getUri()), _ve($this->sub_state)));
- return;
- }
- if ($post === '') {
- common_log(LOG_ERR, __METHOD__ . ": ignoring empty post");
- return;
- }
- try {
- if (!$this->validatePushSig($post, $hmac)) {
- // Per spec we silently drop input with a bad sig,
- // while reporting receipt to the server.
- return;
- }
- $this->receiveFeed($post);
- } catch (FeedSubBadPushSignatureException $e) {
- // We got a signature, so something could be wrong. Let's check to see if
- // maybe upstream has switched to another hub. Let's fetch feed and then
- // compare rel="hub" with $this->huburi, which is done in $this->ensureHub()
- $this->ensureHub(true);
- }
- }
- /**
- * All our feed URIs should be URLs.
- */
- public function importFeed()
- {
- $feed_url = $this->getUri();
- // Fetch the URL
- try {
- common_log(LOG_INFO, sprintf('Importing feed backlog from %s', $feed_url));
- $feed_xml = HTTPClient::quickGet($feed_url, 'application/atom+xml');
- } catch (Exception $e) {
- throw new FeedSubException("Could not fetch feed from URL '%s': %s (%d).\n", $feed_url, $e->getMessage(), $e->getCode());
- }
- return $this->receiveFeed($feed_xml);
- }
- protected function receiveFeed($feed_xml)
- {
- // We're passed the XML for the Atom feed as $feed_xml,
- // so read it into a DOMDocument and process.
- $feed = new DOMDocument();
- if (!$feed->loadXML($feed_xml)) {
- // @fixme might help to include the err message
- common_log(LOG_ERR, __METHOD__ . ": ignoring invalid XML");
- return;
- }
- $orig = clone($this);
- $this->last_update = common_sql_now();
- $this->update($orig);
- Event::handle('StartFeedSubReceive', array($this, $feed));
- Event::handle('EndFeedSubReceive', array($this, $feed));
- }
- /**
- * Validate the given Atom chunk and HMAC signature against our
- * shared secret that was set up at subscription time.
- *
- * If we don't have a shared secret, there should be no signature.
- * If we do, our calculated HMAC should match theirs.
- *
- * @param string $post raw XML source as POSTed to us
- * @param string $hmac X-Hub-Signature HTTP header value, or empty
- * @return boolean true for a match
- */
- protected function validatePushSig($post, $hmac)
- {
- if ($this->secret) {
- // {3,16} because shortest hash algorithm name is 3 characters (md2,md4,md5) and longest
- // is currently 11 characters, but we'll leave some margin in the end...
- if (preg_match('/^([0-9a-zA-Z\-\,]{3,16})=([0-9a-fA-F]+)$/', $hmac, $matches)) {
- $hash_algo = strtolower($matches[1]);
- $their_hmac = strtolower($matches[2]);
- common_debug(sprintf(__METHOD__ . ': WebSub push from feed %s uses HMAC algorithm %s with value: %s', _ve($this->getUri()), _ve($hash_algo), _ve($their_hmac)));
- if (!in_array($hash_algo, hash_algos())) {
- // We can't handle this at all, PHP doesn't recognize the algorithm name ('md5', 'sha1', 'sha256' etc: https://secure.php.net/manual/en/function.hash-algos.php)
- common_log(LOG_ERR, sprintf(__METHOD__.': HMAC algorithm %s unsupported, not found in PHP hash_algos()', _ve($hash_algo)));
- return false;
- } elseif (!is_null(common_config('security', 'hash_algos')) && !in_array($hash_algo, common_config('security', 'hash_algos'))) {
- // We _won't_ handle this because there is a list of accepted hash algorithms and this one is not in it.
- common_log(LOG_ERR, sprintf(__METHOD__.': Whitelist for HMAC algorithms exist, but %s is not included.', _ve($hash_algo)));
- return false;
- }
- $our_hmac = hash_hmac($hash_algo, $post, $this->secret);
- if ($their_hmac !== $our_hmac) {
- common_log(LOG_ERR, sprintf(__METHOD__.': ignoring WebSub push with bad HMAC hash: got %s, expected %s for feed %s from hub %s', _ve($their_hmac), _ve($our_hmac), _ve($this->getUri()), _ve($this->huburi)));
- throw new FeedSubBadPushSignatureException('Incoming WebSub push signature did not match expected HMAC hash.');
- }
- return true;
- } else {
- common_log(LOG_ERR, sprintf(__METHOD__.': ignoring WebSub push with bogus HMAC==', _ve($hmac)));
- }
- } else {
- if (empty($hmac)) {
- return true;
- } else {
- common_log(LOG_ERR, sprintf(__METHOD__.': ignoring WebSub push with unexpected HMAC==%s', _ve($hmac)));
- }
- }
- return false;
- }
- public function delete($useWhere=false)
- {
- try {
- $oprofile = Ostatus_profile::getKV('feeduri', $this->getUri());
- if ($oprofile instanceof Ostatus_profile) {
- // Check if there's a profile. If not, handle the NoProfileException below
- $profile = $oprofile->localProfile();
- }
- } catch (NoProfileException $e) {
- // If the Ostatus_profile has no local Profile bound to it, let's clean it out at the same time
- $oprofile->delete();
- } catch (NoUriException $e) {
- // FeedSub->getUri() can throw a NoUriException, let's just go ahead and delete it
- }
- return parent::delete($useWhere);
- }
- }
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