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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/>.
+ */
+
+/**
+ * @package OStatusPlugin
+ * @maintainer Brion Vibber <brion@status.net>
+ */
+
+/*
+PuSH subscription flow:
+
+ $profile->subscribe()
+ generate random verification token
+ save to verify_token
+ 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
+
+*/
+
+class FeedDBException extends FeedSubException
+{
+ public $obj;
+
+ function __construct($obj)
+ {
+ parent::__construct('Database insert failure');
+ $this->obj = $obj;
+ }
+}
+
+/**
+ * FeedSub handles low-level PubHubSubbub (PuSH) subscriptions.
+ * Higher-level behavior building OStatus stuff on top is handled
+ * under Ostatus_profile.
+ */
+class FeedSub extends Memcached_DataObject
+{
+ public $__table = 'feedsub';
+
+ public $id;
+ public $feeduri;
+
+ // PuSH subscription data
+ public $huburi;
+ public $secret;
+ public $verify_token;
+ public $sub_state; // subscribe, active, unsubscribe, inactive
+ public $sub_start;
+ public $sub_end;
+ public $last_update;
+
+ public $created;
+ public $modified;
+
+ public /*static*/ function staticGet($k, $v=null)
+ {
+ return parent::staticGet(__CLASS__, $k, $v);
+ }
+
+ /**
+ * return table definition for DB_DataObject
+ *
+ * DB_DataObject needs to know something about the table to manipulate
+ * instances. This method provides all the DB_DataObject needs to know.
+ *
+ * @return array array of column definitions
+ */
+
+ function table()
+ {
+ return array('id' => DB_DATAOBJECT_INT + DB_DATAOBJECT_NOTNULL,
+ 'uri' => DB_DATAOBJECT_STR + DB_DATAOBJECT_NOTNULL,
+ 'huburi' => DB_DATAOBJECT_STR,
+ 'secret' => DB_DATAOBJECT_STR,
+ 'verify_token' => DB_DATAOBJECT_STR,
+ 'sub_state' => DB_DATAOBJECT_STR + DB_DATAOBJECT_NOTNULL,
+ 'sub_start' => DB_DATAOBJECT_STR + DB_DATAOBJECT_DATE + DB_DATAOBJECT_TIME,
+ 'sub_end' => DB_DATAOBJECT_STR + DB_DATAOBJECT_DATE + DB_DATAOBJECT_TIME,
+ 'last_update' => DB_DATAOBJECT_STR + DB_DATAOBJECT_DATE + DB_DATAOBJECT_TIME,
+ 'created' => DB_DATAOBJECT_STR + DB_DATAOBJECT_DATE + DB_DATAOBJECT_TIME + DB_DATAOBJECT_NOTNULL,
+ 'modified' => DB_DATAOBJECT_STR + DB_DATAOBJECT_DATE + DB_DATAOBJECT_TIME + DB_DATAOBJECT_NOTNULL);
+ }
+
+ static function schemaDef()
+ {
+ return array(new ColumnDef('id', 'integer',
+ /*size*/ null,
+ /*nullable*/ false,
+ /*key*/ 'PRI',
+ /*default*/ '0',
+ /*extra*/ null,
+ /*auto_increment*/ true),
+ new ColumnDef('uri', 'varchar',
+ 255, false, 'UNI'),
+ new ColumnDef('huburi', 'text',
+ null, true),
+ new ColumnDef('verify_token', 'text',
+ null, true),
+ new ColumnDef('secret', 'text',
+ null, true),
+ new ColumnDef('sub_state', "enum('subscribe','active','unsubscribe','inactive')",
+ null, false),
+ new ColumnDef('sub_start', 'datetime',
+ null, true),
+ new ColumnDef('sub_end', 'datetime',
+ null, true),
+ new ColumnDef('last_update', 'datetime',
+ null, false),
+ new ColumnDef('created', 'datetime',
+ null, false),
+ new ColumnDef('modified', 'datetime',
+ null, false));
+ }
+
+ /**
+ * return key definitions for DB_DataObject
+ *
+ * DB_DataObject needs to know about keys that the table has; this function
+ * defines them.
+ *
+ * @return array key definitions
+ */
+
+ function keys()
+ {
+ return array_keys($this->keyTypes());
+ }
+
+ /**
+ * return key definitions for Memcached_DataObject
+ *
+ * Our caching system uses the same key definitions, but uses a different
+ * method to get them.
+ *
+ * @return array key definitions
+ */
+
+ function keyTypes()
+ {
+ return array('id' => 'K', 'uri' => 'U');
+ }
+
+ function sequenceKey()
+ {
+ return array('id', true, false);
+ }
+
+ /**
+ * Fetch the StatusNet-side profile for this feed
+ * @return Profile
+ */
+ public function localProfile()
+ {
+ if ($this->profile_id) {
+ return Profile::staticGet('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::staticGet('id', $this->group_id);
+ }
+ return null;
+ }
+
+ /**
+ * @param string $feeduri
+ * @return FeedSub
+ * @throws FeedSubException if feed is invalid or lacks PuSH setup
+ */
+ public static function ensureFeed($feeduri)
+ {
+ $current = self::staticGet('uri', $feeduri);
+ if ($current) {
+ return $current;
+ }
+
+ $discover = new FeedDiscovery();
+ $discover->discoverFromFeedURL($feeduri);
+
+ $huburi = $discover->getAtomLink('hub');
+ if (!$huburi) {
+ throw new FeedSubNoHubException();
+ }
+
+ $feedsub = new FeedSub();
+ $feedsub->uri = $feeduri;
+ $feedsub->huburi = $huburi;
+ $feedsub->sub_state = 'inactive';
+
+ $feedsub->created = common_sql_now();
+ $feedsub->modified = common_sql_now();
+
+ $result = $feedsub->insert();
+ if (empty($result)) {
+ throw new FeedDBException($feedsub);
+ }
+
+ return $feedsub;
+ }
+
+ /**
+ * Send a subscription request to the hub for this feed.
+ * The hub will later send us a confirmation POST to /main/push/callback.
+ *
+ * @return bool true on success, false on failure
+ * @throws ServerException if feed state is not valid
+ */
+ public function subscribe($mode='subscribe')
+ {
+ if ($this->sub_state && $this->sub_state != 'inactive') {
+ throw new ServerException("Attempting to start PuSH subscription to feed in state $this->sub_state");
+ }
+ if (empty($this->huburi)) {
+ if (common_config('feedsub', 'nohub')) {
+ // Fake it! We're just testing remote feeds w/o hubs.
+ return true;
+ } else {
+ throw new ServerException("Attempting to start PuSH subscription for feed with no hub");
+ }
+ }
+
+ return $this->doSubscribe('subscribe');
+ }
+
+ /**
+ * Send a PuSH unsubscription request to the hub for this feed.
+ * The hub will later send us a confirmation POST to /main/push/callback.
+ *
+ * @return bool true on success, false on failure
+ * @throws ServerException if feed state is not valid
+ */
+ public function unsubscribe() {
+ if ($this->sub_state != 'active') {
+ throw new ServerException("Attempting to end PuSH subscription to feed in state $this->sub_state");
+ }
+ if (empty($this->huburi)) {
+ if (common_config('feedsub', 'nohub')) {
+ // Fake it! We're just testing remote feeds w/o hubs.
+ return true;
+ } else {
+ throw new ServerException("Attempting to end PuSH subscription for feed with no hub");
+ }
+ }
+
+ return $this->doSubscribe('unsubscribe');
+ }
+
+ protected function doSubscribe($mode)
+ {
+ $orig = clone($this);
+ $this->verify_token = common_good_rand(16);
+ if ($mode == 'subscribe') {
+ $this->secret = common_good_rand(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' => 'sync',
+ 'hub.verify_token' => $this->verify_token,
+ 'hub.secret' => $this->secret,
+ 'hub.topic' => $this->uri);
+ $client = new HTTPClient();
+ $response = $client->post($this->huburi, $headers, $post);
+ $status = $response->getStatus();
+ if ($status == 202) {
+ common_log(LOG_INFO, __METHOD__ . ': sub req ok, awaiting verification callback');
+ return true;
+ } else if ($status == 204) {
+ common_log(LOG_INFO, __METHOD__ . ': sub req ok and verified');
+ return true;
+ } else if ($status >= 200 && $status < 300) {
+ common_log(LOG_ERR, __METHOD__ . ": sub req returned unexpected HTTP $status: " . $response->getBody());
+ return false;
+ } else {
+ common_log(LOG_ERR, __METHOD__ . ": sub req failed with HTTP $status: " . $response->getBody());
+ return false;
+ }
+ } catch (Exception $e) {
+ // wtf!
+ common_log(LOG_ERR, __METHOD__ . ": error \"{$e->getMessage()}\" hitting hub $this->huburi subscribing to $this->uri");
+
+ $orig = clone($this);
+ $this->verify_token = '';
+ $this->sub_state = 'inactive';
+ $this->update($orig);
+ unset($orig);
+
+ return false;
+ }
+ }
+
+ /**
+ * Save PuSH 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=0)
+ {
+ $original = clone($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;
+ }
+ $this->modified = common_sql_now();
+
+ return $this->update($original);
+ }
+
+ /**
+ * Save PuSH unsubscription confirmation.
+ * Wipes active PuSH 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->verify_token = '';
+ $this->secret = '';
+ $this->sub_state = '';
+ $this->sub_start = '';
+ $this->sub_end = '';
+ $this->modified = common_sql_now();
+
+ return $this->update($original);
+ }
+
+ /**
+ * Accept updates from a PuSH 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, $hmac)
+ {
+ common_log(LOG_INFO, __METHOD__ . ": packet for \"$this->uri\"! $hmac $post");
+
+ if ($this->sub_state != 'active') {
+ common_log(LOG_ERR, __METHOD__ . ": ignoring PuSH for inactive feed $this->uri (in state '$this->sub_state')");
+ return;
+ }
+
+ if ($post === '') {
+ common_log(LOG_ERR, __METHOD__ . ": ignoring empty post");
+ return;
+ }
+
+ if (!$this->validatePushSig($post, $hmac)) {
+ // Per spec we silently drop input with a bad sig,
+ // while reporting receipt to the server.
+ return;
+ }
+
+ $feed = new DOMDocument();
+ if (!$feed->loadXML($post)) {
+ // @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 we do, our the 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) {
+ if (preg_match('/^sha1=([0-9a-fA-F]{40})$/', $hmac, $matches)) {
+ $their_hmac = strtolower($matches[1]);
+ $our_hmac = hash_hmac('sha1', $post, $this->secret);
+ if ($their_hmac === $our_hmac) {
+ return true;
+ }
+ common_log(LOG_ERR, __METHOD__ . ": ignoring PuSH with bad SHA-1 HMAC: got $their_hmac, expected $our_hmac");
+ } else {
+ common_log(LOG_ERR, __METHOD__ . ": ignoring PuSH with bogus HMAC '$hmac'");
+ }
+ } else {
+ if (empty($hmac)) {
+ return true;
+ } else {
+ common_log(LOG_ERR, __METHOD__ . ": ignoring PuSH with unexpected HMAC '$hmac'");
+ }
+ }
+ return false;
+ }
+
+}