/usr/share/php/Horde/SessionHandler/Storage/Stack.php is in php-horde-sessionhandler 2.2.4-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/**
* SessionHandler storage implementation that will loop through a list of
* storage drivers to handle the session information.
* This driver allows for use of caching backends on top of persistent
* backends, for example.
*
* Copyright 2010-2014 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.
*
* @author Michael Slusarz <slusarz@horde.org>
* @category Horde
* @license http://www.horde.org/licenses/lgpl21 LGPL 2.1
* @package SessionHandler
*/
class Horde_SessionHandler_Storage_Stack extends Horde_SessionHandler_Storage
{
/**
* Stack of storage objects.
*
* @var array
*/
protected $_stack = array();
/**
* Constructor.
*
* @param array $params Parameters:
* <pre>
* stack - (array) [REQUIRED] A list of storage objects to loop
* through, in order of priority. The last entry is considered
* the "master" server.
* </pre>
*
* @throws InvalidArgumentException
*/
public function __construct(array $params = array())
{
if (!isset($params['stack'])) {
throw new InvalidArgumentException('Missing stack parameter.');
}
$this->_stack = $params['stack'];
unset($params['stack']);
parent::__construct($params);
}
/**
*/
public function open($save_path = null, $session_name = null)
{
foreach ($this->_stack as $val) {
$val->open($save_path, $session_name);
}
}
/**
*/
public function close()
{
foreach ($this->_stack as $val) {
$val->close();
}
}
/**
*/
public function read($id)
{
foreach ($this->_stack as $val) {
$result = $val->read($id);
if ($result === false) {
break;
}
}
return $result;
}
/**
*/
public function write($id, $session_data)
{
/* Do writes in *reverse* order - it is OK if a write to one of the
* non-master backends fails. */
$master = true;
foreach (array_reverse($this->_stack) as $val) {
$result = $val->write($id, $session_data);
if ($result === false) {
if ($master) {
return false;
}
/* Attempt to invalidate cache if write failed. */
$val->destroy($id);
}
$master = false;
}
return true;
}
/**
*/
public function destroy($id)
{
/* Only report success from master. */
$master = $success = true;
foreach (array_reverse($this->_stack) as $val) {
$result = $val->destroy($id);
if ($master && ($result === false)) {
$success = false;
}
$master = false;
}
return $success;
}
/**
*/
public function gc($maxlifetime = 300)
{
/* Only report GC results from master. */
foreach ($this->_stack as $val) {
$result = $val->gc($maxlifetime);
}
return $result;
}
/**
*/
public function getSessionIDs()
{
/* Grab session ID list from the master. */
$ob = end($this->_stack);
return $ob->getSessionIDs();
}
}
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