/usr/share/php/Horde/SessionHandler/Storage/Mongo.php is in php-horde-sessionhandler 2.2.9-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/**
* Copyright 2013-2017 Horde LLC (http://www.horde.org/)
*
* See the enclosed file COPYING for license information (LGPL). If you
* did not receive this file, see http://www.horde.org/licenses/lgpl21.
*
* @category Horde
* @copyright 2013-2017 Horde LLC
* @license http://www.horde.org/licenses/lgpl21 LGPL 2.1
* @package SessionHandler
*/
/**
* MongoDB storage driver.
*
* @author Michael Slusarz <slusarz@horde.org>
* @category Horde
* @copyright 2013-2017 Horde LLC
* @license http://www.horde.org/licenses/lgpl21 LGPL 2.1
* @package SessionHandler
*/
class Horde_SessionHandler_Storage_Mongo extends Horde_SessionHandler_Storage implements Horde_Mongo_Collection_Index
{
/* Field names. */
const DATA = 'data';
const LOCK = 'lock';
const MODIFIED = 'ts';
const SID = 'sid';
/**
* MongoCollection object for the storage table.
*
* @var MongoCollection
*/
protected $_db;
/**
* Is the session locked.
*
* @var boolean
*/
protected $_locked = false;
/**
* Indices list.
*
* @var array
*/
protected $_indices = array(
'index_ts' => array(
self::MODIFIED => 1
)
);
/**
* Constructor.
*
* @param array $params Parameters:
* <pre>
* collection: (string) The collection to store data in.
* mongo_db: (Horde_Mongo_Client) [REQUIRED] The Mongo client object.
* </pre>
*/
public function __construct(array $params = array())
{
if (!isset($params['mongo_db'])) {
throw new InvalidArgumentException('Missing mongo_db parameter.');
}
parent::__construct(array_merge(array(
'collection' => 'horde_sessionhandler'
), $params));
$this->_db = $this->_params['mongo_db']->selectCollection(null, $this->_params['collection']);
}
/**
*/
public function open($save_path = null, $session_name = null)
{
return true;
}
/**
*/
public function close()
{
if ($this->_locked) {
try {
$this->_db->update(
array(self::SID => $this->_locked),
array('$unset' => array(self::LOCK => ''))
);
} catch (MongoException $e) {}
$this->_locked = false;
}
return true;
}
/**
*/
public function read($id)
{
/* Check for session existence. Unfortunately needed because
* we need findAndModify() for its atomicity for locking, but this
* atomicity means we can't tell the difference between a
* non-existent session and a locked session. */
$exists = $this->_db->count(array(self::SID => $id));
$exist_check = false;
$i = 0;
/* Set a maximum unlocking time, to prevent runaway PHP processes. */
$max = ini_get('max_execution_time') * 10;
while (true) {
$data = array(
self::LOCK => time(),
self::SID => $id
);
/* This call will either create the session if it doesn't exist,
* or will update the current session and lock it if not already
* locked. If a session exists, and is locked, $res will contain
* an empty set and we need to sleep and wait for lock to be
* removed. */
$res = $this->_db->findAndModify(
array(
self::SID => $id,
self::LOCK => array('$exists' => $exist_check)
),
array('$set' => $data),
array(self::DATA => true),
array(
'upsert' => !$exists
)
);
if (!$exists || isset($res[self::DATA])) {
break;
}
/* After a second, check the timestamp to determine if this is
* a stale session. This can prevent long waits on a busted PHP
* process. */
if ($i == 10) {
$res = $this->_db->findOne(
array(self::SID => $id),
array(self::LOCK => true)
);
$max = isset($res[self::LOCK])
? ((time() - $res[self::LOCK]) * 10)
: $i;
}
if (++$i >= $max) {
$exist_check = true;
} else {
/* Sleep for 0.1 second before trying again. */
usleep(100000);
}
}
$this->_locked = $id;
return isset($res[self::DATA])
? $res[self::DATA]->bin
: '';
}
/**
*/
public function write($id, $session_data)
{
/* Update/insert session data. */
try {
$this->_db->update(array(
self::SID => $id
), array(
self::DATA => new MongoBinData($session_data, MongoBinData::BYTE_ARRAY),
self::MODIFIED => time(),
self::SID => $id
), array(
'upsert' => true
));
$this->_locked = false;
} catch (MongoException $e) {
return false;
}
return true;
}
/**
*/
public function destroy($id)
{
try {
$this->_db->remove(array(
self::SID => $id
));
return true;
} catch (MongoException $e) {}
return false;
}
/**
*/
public function gc($maxlifetime = 300)
{
try {
$this->_db->remove(array(
self::MODIFIED => array(
'$lt' => (time() - $maxlifetime)
)
));
return true;
} catch (MongoException $e) {}
return false;
}
/**
*/
public function getSessionIDs()
{
$ids = array();
try {
$cursor = $this->_db->find(array(
self::MODIFIED => array(
'$gte' => (time() - ini_get('session.gc_maxlifetime'))
)
), array(self::SID => true));
foreach ($cursor as $val) {
$ids[] = $val[self::SID];
}
} catch (MongoException $e) {}
return $ids;
}
/* Horde_Mongo_Collection_Index methods. */
/**
*/
public function checkMongoIndices()
{
return $this->_params['mongo_db']->checkIndices($this->_db, $this->_indices);
}
/**
*/
public function createMongoIndices()
{
$this->_params['mongo_db']->createIndices($this->_db, $this->_indices);
}
}
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