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<?php
/**
* @package Joomla.Platform
* @subpackage Session
*
* @copyright Copyright (C) 2005 - 2014 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die;
/**
* Custom session storage handler for PHP
*
* @package Joomla.Platform
* @subpackage Session
* @see http://www.php.net/manual/en/function.session-set-save-handler.php
* @todo When dropping compatibility with PHP 5.3 use the SessionHandlerInterface and the SessionHandler class
* @since 11.1
*/
abstract class JSessionStorage extends JObject
{
/**
* @var array JSessionStorage instances container.
* @since 11.3
*/
protected static $instances = array();
/**
* Constructor
*
* @param array $options Optional parameters.
*
* @since 11.1
*/
public function __construct($options = array())
{
$this->register($options);
}
/**
* Returns a session storage handler object, only creating it if it doesn't already exist.
*
* @param string $name The session store to instantiate
* @param array $options Array of options
*
* @return JSessionStorage
*
* @since 11.1
*/
public static function getInstance($name = 'none', $options = array())
{
$name = strtolower(JFilterInput::getInstance()->clean($name, 'word'));
if (empty(self::$instances[$name]))
{
$class = 'JSessionStorage' . ucfirst($name);
if (!class_exists($class))
{
$path = dirname(__FILE__) . '/storage/' . $name . '.php';
if (file_exists($path))
{
require_once $path;
}
else
{
// No attempt to die gracefully here, as it tries to close the non-existing session
jexit('Unable to load session storage class: ' . $name);
}
}
self::$instances[$name] = new $class($options);
}
return self::$instances[$name];
}
/**
* Register the functions of this class with PHP's session handler
*
* @return void
*
* @since 11.1
*/
public function register()
{
// Use this object as the session handler
session_set_save_handler(
array($this, 'open'), array($this, 'close'), array($this, 'read'), array($this, 'write'),
array($this, 'destroy'), array($this, 'gc')
);
}
/**
* Open the SessionHandler backend.
*
* @param string $save_path The path to the session object.
* @param string $session_name The name of the session.
*
* @return boolean True on success, false otherwise.
*
* @since 11.1
*/
public function open($save_path, $session_name)
{
return true;
}
/**
* Close the SessionHandler backend.
*
* @return boolean True on success, false otherwise.
*
* @since 11.1
*/
public function close()
{
return true;
}
/**
* Read the data for a particular session identifier from the
* SessionHandler backend.
*
* @param string $id The session identifier.
*
* @return string The session data.
*
* @since 11.1
*/
public function read($id)
{
return;
}
/**
* Write session data to the SessionHandler backend.
*
* @param string $id The session identifier.
* @param string $session_data The session data.
*
* @return boolean True on success, false otherwise.
*
* @since 11.1
*/
public function write($id, $session_data)
{
return true;
}
/**
* Destroy the data for a particular session identifier in the
* SessionHandler backend.
*
* @param string $id The session identifier.
*
* @return boolean True on success, false otherwise.
*
* @since 11.1
*/
public function destroy($id)
{
return true;
}
/**
* Garbage collect stale sessions from the SessionHandler backend.
*
* @param integer $maxlifetime The maximum age of a session.
*
* @return boolean True on success, false otherwise.
*
* @since 11.1
*/
public function gc($maxlifetime = null)
{
return true;
}
/**
* Test to see if the SessionHandler is available.
*
* @return boolean True on success, false otherwise.
*
* @since 11.1
*/
public static function test()
{
return true;
}
}