gnu-social/plugins/OStatus/classes/HubSub.php

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<?php
/*
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 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/>.
*/
/**
* PuSH feed subscription record
* @package Hub
* @author Brion Vibber <brion@status.net>
*/
class HubSub extends Memcached_DataObject
{
public $__table = 'hubsub';
public $hashkey; // sha1(topic . '|' . $callback); (topic, callback) key is too long for myisam in utf8
public $topic;
public $callback;
public $secret;
public $lease;
public $sub_start;
public $sub_end;
public $created;
public $modified;
public /*static*/ function staticGet($topic, $callback)
{
return parent::staticGet(__CLASS__, 'hashkey', self::hashkey($topic, $callback));
}
protected static function hashkey($topic, $callback)
{
return sha1($topic . '|' . $callback);
}
/**
* return table definition for DB_DataObject
*
* DB_DataObject needs to know something about the table to manipulate
* instances. This method provides all the DB_DataObject needs to know.
*
* @return array array of column definitions
*/
function table()
{
return array('hashkey' => DB_DATAOBJECT_STR + DB_DATAOBJECT_NOTNULL,
'topic' => DB_DATAOBJECT_STR + DB_DATAOBJECT_NOTNULL,
'callback' => DB_DATAOBJECT_STR + DB_DATAOBJECT_NOTNULL,
'secret' => DB_DATAOBJECT_STR,
'lease' => DB_DATAOBJECT_INT,
'sub_start' => DB_DATAOBJECT_STR + DB_DATAOBJECT_DATE + DB_DATAOBJECT_TIME,
'sub_end' => DB_DATAOBJECT_STR + DB_DATAOBJECT_DATE + DB_DATAOBJECT_TIME,
'created' => DB_DATAOBJECT_STR + DB_DATAOBJECT_DATE + DB_DATAOBJECT_TIME + DB_DATAOBJECT_NOTNULL,
'modified' => DB_DATAOBJECT_STR + DB_DATAOBJECT_DATE + DB_DATAOBJECT_TIME + DB_DATAOBJECT_NOTNULL);
}
static function schemaDef()
{
return array(new ColumnDef('hashkey', 'char',
/*size*/40,
/*nullable*/false,
/*key*/'PRI'),
new ColumnDef('topic', 'varchar',
/*size*/255,
/*nullable*/false,
/*key*/'MUL'),
new ColumnDef('callback', 'varchar',
255, false),
new ColumnDef('secret', 'text',
null, true),
new ColumnDef('lease', 'int',
null, true),
new ColumnDef('sub_start', 'datetime',
null, true),
new ColumnDef('sub_end', 'datetime',
null, true),
new ColumnDef('created', 'datetime',
null, false),
new ColumnDef('modified', 'datetime',
null, false));
}
function keys()
{
return array_keys($this->keyTypes());
}
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function sequenceKey()
{
return array(false, false, 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 keyTypes()
{
return array('hashkey' => 'K');
}
/**
* Validates a requested lease length, sets length plus
* subscription start & end dates.
*
* Does not save to database -- use before insert() or update().
*
* @param int $length in seconds
*/
function setLease($length)
{
assert(is_int($length));
$min = 86400;
$max = 86400 * 30;
if ($length == 0) {
// We want to garbage collect dead subscriptions!
$length = $max;
} elseif( $length < $min) {
$length = $min;
} else if ($length > $max) {
$length = $max;
}
$this->lease = $length;
$this->start_sub = common_sql_now();
$this->end_sub = common_sql_date(time() + $length);
}
/**
* Schedule a future verification ping to the subscriber.
* If queues are disabled, will be immediate.
*
* @param string $mode 'subscribe' or 'unsubscribe'
* @param string $token hub.verify_token value, if provided by client
*/
function scheduleVerify($mode, $token=null, $retries=null)
{
if ($retries === null) {
$retries = intval(common_config('ostatus', 'hub_retries'));
}
$data = array('sub' => clone($this),
'mode' => $mode,
'token' => $token,
'retries' => $retries);
$qm = QueueManager::get();
$qm->enqueue($data, 'hubconf');
}
/**
* Send a verification ping to subscriber, and if confirmed apply the changes.
* This may create, update, or delete the database record.
*
* @param string $mode 'subscribe' or 'unsubscribe'
* @param string $token hub.verify_token value, if provided by client
* @throws ClientException on failure
*/
function verify($mode, $token=null)
{
assert($mode == 'subscribe' || $mode == 'unsubscribe');
$challenge = common_good_rand(32);
$params = array('hub.mode' => $mode,
'hub.topic' => $this->topic,
'hub.challenge' => $challenge);
if ($mode == 'subscribe') {
$params['hub.lease_seconds'] = $this->lease;
}
if ($token !== null) {
$params['hub.verify_token'] = $token;
}
// Any existing query string parameters must be preserved
$url = $this->callback;
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if (strpos($url, '?') !== false) {
$url .= '&';
} else {
$url .= '?';
}
$url .= http_build_query($params, '', '&');
$request = new HTTPClient();
$response = $request->get($url);
$status = $response->getStatus();
if ($status >= 200 && $status < 300) {
common_log(LOG_INFO, "Verified $mode of $this->callback:$this->topic");
} else {
throw new ClientException("Hub subscriber verification returned HTTP $status");
}
$old = HubSub::staticGet($this->topic, $this->callback);
if ($mode == 'subscribe') {
if ($old) {
$this->update($old);
} else {
$ok = $this->insert();
}
} else if ($mode == 'unsubscribe') {
if ($old) {
$old->delete();
} else {
// That's ok, we're already unsubscribed.
}
}
}
/**
* Insert wrapper; transparently set the hash key from topic and callback columns.
* @return mixed success
*/
function insert()
{
$this->hashkey = self::hashkey($this->topic, $this->callback);
$this->created = common_sql_now();
$this->modified = common_sql_now();
return parent::insert();
}
/**
* Update wrapper; transparently update modified column.
* @return boolean success
*/
function update($old=null)
{
$this->modified = common_sql_now();
return parent::update($old);
}
/**
* Schedule delivery of a 'fat ping' to the subscriber's callback
* endpoint. If queues are disabled, this will run immediately.
*
* @param string $atom well-formed Atom feed
* @param int $retries optional count of retries if POST fails; defaults to hub_retries from config or 0 if unset
*/
function distribute($atom, $retries=null)
{
if ($retries === null) {
$retries = intval(common_config('ostatus', 'hub_retries'));
}
if (common_config('ostatus', 'local_push_bypass')) {
// If target is a local site, bypass the web server and drop the
// item directly into the target's input queue.
$url = parse_url($this->callback);
$wildcard = common_config('ostatus', 'local_wildcard');
$site = Status_network::getFromHostname($url['host'], $wildcard);
if ($site) {
if ($this->secret) {
$hmac = 'sha1=' . hash_hmac('sha1', $atom, $this->secret);
} else {
$hmac = '';
}
// Hack: at the moment we stick the subscription ID in the callback
// URL so we don't have to look inside the Atom to route the subscription.
// For now this means we need to extract that from the target URL
// so we can include it in the data.
$parts = explode('/', $url['path']);
$subId = intval(array_pop($parts));
$data = array('feedsub_id' => $subId,
'post' => $atom,
'hmac' => $hmac);
common_log(LOG_DEBUG, "Cross-site PuSH bypass enqueueing straight to $site->nickname feed $subId");
$qm = QueueManager::get();
$qm->enqueue($data, 'pushin', $site->nickname);
return;
}
}
// We dare not clone() as when the clone is discarded it'll
// destroy the result data for the parent query.
// @fixme use clone() again when it's safe to copy an
// individual item from a multi-item query again.
$sub = HubSub::staticGet($this->topic, $this->callback);
$data = array('sub' => $sub,
'atom' => $atom,
'retries' => $retries);
common_log(LOG_INFO, "Queuing PuSH: $this->topic to $this->callback");
$qm = QueueManager::get();
$qm->enqueue($data, 'hubout');
}
/**
* Send a 'fat ping' to the subscriber's callback endpoint
* containing the given Atom feed chunk.
*
* Determination of which items to send should be done at
* a higher level; don't just shove in a complete feed!
*
* @param string $atom well-formed Atom feed
* @throws Exception (HTTP or general)
*/
function push($atom)
{
$headers = array('Content-Type: application/atom+xml');
if ($this->secret) {
$hmac = hash_hmac('sha1', $atom, $this->secret);
$headers[] = "X-Hub-Signature: sha1=$hmac";
} else {
$hmac = '(none)';
}
common_log(LOG_INFO, "About to push feed to $this->callback for $this->topic, HMAC $hmac");
$request = new HTTPClient();
$request->setBody($atom);
$response = $request->post($this->callback, $headers);
if ($response->isOk()) {
return true;
} else {
throw new Exception("Callback returned status: " .
$response->getStatus() .
"; body: " .
trim($response->getBody()));
}
}
}