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 $challenge;
public $lease;
public $sub_start;
public $sub_end;
public $created;
public /*static*/ function staticGet($topic, $callback)
{
return parent::staticGet(__CLASS__, 'hashkey', self::hashkey($topic, $callback));
}
protected static function hashkey($topic, $callback)
{
return sha1($topic . '|' . $callback);
}
/**
* return table definition for DB_DataObject
*
* DB_DataObject needs to know something about the table to manipulate
* instances. This method provides all the DB_DataObject needs to know.
*
* @return array array of column definitions
*/
function table()
{
return array('hashkey' => DB_DATAOBJECT_STR + DB_DATAOBJECT_NOTNULL,
'topic' => DB_DATAOBJECT_STR + DB_DATAOBJECT_NOTNULL,
'callback' => DB_DATAOBJECT_STR + DB_DATAOBJECT_NOTNULL,
'secret' => DB_DATAOBJECT_STR,
'challenge' => DB_DATAOBJECT_STR,
'lease' => DB_DATAOBJECT_INT,
'sub_start' => DB_DATAOBJECT_STR + DB_DATAOBJECT_DATE + DB_DATAOBJECT_TIME,
'sub_end' => DB_DATAOBJECT_STR + DB_DATAOBJECT_DATE + DB_DATAOBJECT_TIME,
'created' => DB_DATAOBJECT_STR + DB_DATAOBJECT_DATE + DB_DATAOBJECT_TIME + DB_DATAOBJECT_NOTNULL);
}
static function schemaDef()
{
return array(new ColumnDef('hashkey', 'char',
/*size*/40,
/*nullable*/false,
/*key*/'PRI'),
new ColumnDef('topic', 'varchar',
/*size*/255,
/*nullable*/false,
/*key*/'KEY'),
new ColumnDef('callback', 'varchar',
255, false),
new ColumnDef('secret', 'text',
null, true),
new ColumnDef('challenge', 'varchar',
32, true),
new ColumnDef('lease', 'int',
null, true),
new ColumnDef('sub_start', 'datetime',
null, true),
new ColumnDef('sub_end', 'datetime',
null, true),
new ColumnDef('created', 'datetime',
null, false));
}
function keys()
{
return array_keys($this->keyTypes());
}
function sequenceKeys()
{
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);
}
/**
* Send a verification ping to subscriber
* @param string $mode 'subscribe' or 'unsubscribe'
* @param string $token hub.verify_token value, if provided by client
*/
function verify($mode, $token=null)
{
assert($mode == 'subscribe' || $mode == 'unsubscribe');
// Is this needed? data object fun...
$clone = clone($this);
$clone->challenge = common_good_rand(16);
$clone->update($this);
$this->challenge = $clone->challenge;
unset($clone);
$params = array('hub.mode' => $mode,
'hub.topic' => $this->topic,
'hub.challenge' => $this->challenge);
if ($mode == 'subscribe') {
$params['hub.lease_seconds'] = $this->lease;
}
if ($token !== null) {
$params['hub.verify_token'] = $token;
}
$url = $this->callback . '?' . http_build_query($params, '', '&'); // @fixme ugly urls
try {
$request = new HTTPClient();
$response = $request->get($url);
$status = $response->getStatus();
if ($status >= 200 && $status < 300) {
$fail = false;
} else {
// @fixme how can we schedule a second attempt?
// Or should we?
$fail = "Returned HTTP $status";
}
} catch (Exception $e) {
$fail = $e->getMessage();
}
if ($fail) {
// @fixme how can we schedule a second attempt?
// or save a fail count?
// Or should we?
common_log(LOG_ERR, "Failed to verify $mode for $this->topic at $this->callback: $fail");
return false;
} else {
if ($mode == 'subscribe') {
// Establish or renew the subscription!
// This seems unnecessary... dataobject fun!
$clone = clone($this);
$clone->challenge = null;
$clone->setLease($this->lease);
$clone->update($this);
unset($clone);
$this->challenge = null;
$this->setLease($this->lease);
common_log(LOG_ERR, "Verified $mode of $this->callback:$this->topic for $this->lease seconds");
} else if ($mode == 'unsubscribe') {
common_log(LOG_ERR, "Verified $mode of $this->callback:$this->topic");
$this->delete();
}
return true;
}
}
/**
* Insert wrapper; transparently set the hash key from topic and callback columns.
* @return boolean success
*/
function insert()
{
$this->hashkey = self::hashkey($this->topic, $this->callback);
return parent::insert();
}
/**
* 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 $atom well-formed Atom feed
*/
function push($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");
try {
$request = new HTTPClient();
$request->setBody($atom);
$response = $request->post($this->callback, $headers);
if ($response->isOk()) {
return true;
}
common_log(LOG_ERR, "Error sending PuSH content " .
"to $this->callback for $this->topic: " .
$response->getStatus());
return false;
} catch (Exception $e) {
common_log(LOG_ERR, "Error sending PuSH content " .
"to $this->callback for $this->topic: " .
$e->getMessage());
return false;
}
}
}