315 lines
11 KiB
PHP
315 lines
11 KiB
PHP
<?php
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/*
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* StatusNet - the distributed open-source microblogging tool
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* Copyright (C) 2010, StatusNet, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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if (!defined('STATUSNET')) {
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exit(1);
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}
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/**
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* PuSH feed subscription record
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* @package Hub
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* @author Brion Vibber <brion@status.net>
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*/
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class HubSub extends Managed_DataObject
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{
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public $__table = 'hubsub';
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public $hashkey; // sha1(topic . '|' . $callback); (topic, callback) key is too long for myisam in utf8
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public $topic;
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public $callback;
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public $secret;
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public $lease;
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public $sub_start;
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public $sub_end;
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public $created;
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public $modified;
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protected static function hashkey($topic, $callback)
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{
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return sha1($topic . '|' . $callback);
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}
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public static function getByHashkey($topic, $callback)
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{
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return self::getKV('hashkey', self::hashkey($topic, $callback));
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}
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public static function schemaDef()
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{
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return array(
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'fields' => array(
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'hashkey' => array('type' => 'char', 'not null' => true, 'length' => 40, 'description' => 'HubSub hashkey'),
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'topic' => array('type' => 'varchar', 'not null' => true, 'length' => 255, 'description' => 'HubSub topic'),
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'callback' => array('type' => 'varchar', 'not null' => true, 'length' => 255, 'description' => 'HubSub callback'),
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'secret' => array('type' => 'text', 'description' => 'HubSub stored secret'),
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'lease' => array('type' => 'int', 'not null' => true, 'description' => 'HubSub leasetime'),
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'sub_start' => array('type' => 'datetime', 'description' => 'subscription start'),
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'sub_end' => array('type' => 'datetime', 'description' => 'subscription end'),
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'created' => array('type' => 'datetime', 'not null' => true, 'description' => 'date this record was created'),
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'modified' => array('type' => 'timestamp', 'not null' => true, 'description' => 'date this record was modified'),
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),
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'primary key' => array('hashkey'),
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'indexes' => array(
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'hubsub_topic_idx' => array('topic'),
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),
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);
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}
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/**
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* Validates a requested lease length, sets length plus
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* subscription start & end dates.
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*
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* Does not save to database -- use before insert() or update().
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*
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* @param int $length in seconds
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*/
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function setLease($length)
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{
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assert(is_int($length));
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$min = 86400;
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$max = 86400 * 30;
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if ($length == 0) {
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// We want to garbage collect dead subscriptions!
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$length = $max;
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} elseif( $length < $min) {
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$length = $min;
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} else if ($length > $max) {
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$length = $max;
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}
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$this->lease = $length;
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$this->start_sub = common_sql_now();
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$this->end_sub = common_sql_date(time() + $length);
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}
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/**
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* Schedule a future verification ping to the subscriber.
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* If queues are disabled, will be immediate.
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*
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* @param string $mode 'subscribe' or 'unsubscribe'
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* @param string $token hub.verify_token value, if provided by client
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*/
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function scheduleVerify($mode, $token=null, $retries=null)
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{
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if ($retries === null) {
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$retries = intval(common_config('ostatus', 'hub_retries'));
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}
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$data = array('sub' => clone($this),
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'mode' => $mode,
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'token' => $token,
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'retries' => $retries);
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$qm = QueueManager::get();
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$qm->enqueue($data, 'hubconf');
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}
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/**
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* Send a verification ping to subscriber, and if confirmed apply the changes.
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* This may create, update, or delete the database record.
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*
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* @param string $mode 'subscribe' or 'unsubscribe'
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* @param string $token hub.verify_token value, if provided by client
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* @throws ClientException on failure
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*/
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function verify($mode, $token=null)
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{
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assert($mode == 'subscribe' || $mode == 'unsubscribe');
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$challenge = common_random_hexstr(32);
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$params = array('hub.mode' => $mode,
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'hub.topic' => $this->topic,
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'hub.challenge' => $challenge);
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if ($mode == 'subscribe') {
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$params['hub.lease_seconds'] = $this->lease;
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}
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if ($token !== null) {
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$params['hub.verify_token'] = $token;
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}
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// Any existing query string parameters must be preserved
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$url = $this->callback;
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if (strpos($url, '?') !== false) {
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$url .= '&';
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} else {
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$url .= '?';
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}
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$url .= http_build_query($params, '', '&');
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$request = new HTTPClient();
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$response = $request->get($url);
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$status = $response->getStatus();
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if ($status >= 200 && $status < 300) {
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common_log(LOG_INFO, "Verified $mode of $this->callback:$this->topic");
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} else {
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// TRANS: Client exception. %s is a HTTP status code.
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throw new ClientException(sprintf(_m('Hub subscriber verification returned HTTP %s.'),$status));
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}
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$old = HubSub::getByHashkey($this->topic, $this->callback);
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if ($mode == 'subscribe') {
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if ($old) {
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$this->update($old);
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} else {
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$ok = $this->insert();
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}
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} else if ($mode == 'unsubscribe') {
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if ($old) {
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$old->delete();
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} else {
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// That's ok, we're already unsubscribed.
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}
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}
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}
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/**
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* Insert wrapper; transparently set the hash key from topic and callback columns.
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* @return mixed success
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*/
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function insert()
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{
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$this->hashkey = self::hashkey($this->topic, $this->callback);
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$this->created = common_sql_now();
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$this->modified = common_sql_now();
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return parent::insert();
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}
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/**
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* Update wrapper; transparently update modified column.
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* @return boolean success
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*/
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function update($old=null)
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{
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$this->modified = common_sql_now();
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return parent::update($old);
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}
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/**
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* Schedule delivery of a 'fat ping' to the subscriber's callback
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* endpoint. If queues are disabled, this will run immediately.
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*
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* @param string $atom well-formed Atom feed
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* @param int $retries optional count of retries if POST fails; defaults to hub_retries from config or 0 if unset
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*/
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function distribute($atom, $retries=null)
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{
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if ($retries === null) {
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$retries = intval(common_config('ostatus', 'hub_retries'));
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}
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if (common_config('ostatus', 'local_push_bypass')) {
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// If target is a local site, bypass the web server and drop the
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// item directly into the target's input queue.
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$url = parse_url($this->callback);
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$wildcard = common_config('ostatus', 'local_wildcard');
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$site = Status_network::getFromHostname($url['host'], $wildcard);
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if ($site) {
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if ($this->secret) {
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$hmac = 'sha1=' . hash_hmac('sha1', $atom, $this->secret);
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} else {
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$hmac = '';
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}
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// Hack: at the moment we stick the subscription ID in the callback
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// URL so we don't have to look inside the Atom to route the subscription.
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// For now this means we need to extract that from the target URL
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// so we can include it in the data.
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$parts = explode('/', $url['path']);
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$subId = intval(array_pop($parts));
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$data = array('feedsub_id' => $subId,
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'post' => $atom,
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'hmac' => $hmac);
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common_log(LOG_DEBUG, "Cross-site PuSH bypass enqueueing straight to $site->nickname feed $subId");
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$qm = QueueManager::get();
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$qm->enqueue($data, 'pushin', $site->nickname);
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return;
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}
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}
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// We dare not clone() as when the clone is discarded it'll
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// destroy the result data for the parent query.
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// @fixme use clone() again when it's safe to copy an
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// individual item from a multi-item query again.
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$sub = HubSub::getByHashkey($this->topic, $this->callback);
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$data = array('sub' => $sub,
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'atom' => $atom,
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'retries' => $retries);
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common_log(LOG_INFO, "Queuing PuSH: $this->topic to $this->callback");
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$qm = QueueManager::get();
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$qm->enqueue($data, 'hubout');
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}
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/**
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* Queue up a large batch of pushes to multiple subscribers
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* for this same topic update.
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*
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* If queues are disabled, this will run immediately.
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*
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* @param string $atom well-formed Atom feed
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* @param array $pushCallbacks list of callback URLs
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*/
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function bulkDistribute($atom, $pushCallbacks)
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{
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$data = array('atom' => $atom,
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'topic' => $this->topic,
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'pushCallbacks' => $pushCallbacks);
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common_log(LOG_INFO, "Queuing PuSH batch: $this->topic to " .
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count($pushCallbacks) . " sites");
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$qm = QueueManager::get();
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$qm->enqueue($data, 'hubprep');
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}
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/**
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* Send a 'fat ping' to the subscriber's callback endpoint
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* containing the given Atom feed chunk.
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*
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* Determination of which items to send should be done at
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* a higher level; don't just shove in a complete feed!
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*
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* @param string $atom well-formed Atom feed
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* @throws Exception (HTTP or general)
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*/
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function push($atom)
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{
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$headers = array('Content-Type: application/atom+xml');
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if ($this->secret) {
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$hmac = hash_hmac('sha1', $atom, $this->secret);
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$headers[] = "X-Hub-Signature: sha1=$hmac";
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} else {
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$hmac = '(none)';
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}
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common_log(LOG_INFO, "About to push feed to $this->callback for $this->topic, HMAC $hmac");
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$request = new HTTPClient();
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$request->setBody($atom);
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$response = $request->post($this->callback, $headers);
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if ($response->isOk()) {
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return true;
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} else {
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// TRANS: Exception. %1$s is a response status code, %2$s is the body of the response.
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throw new Exception(sprintf(_m('Callback returned status: %1$s. Body: %2$s'),
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$response->getStatus(),trim($response->getBody())));
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}
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}
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}
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