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<?php
/**
* @package Joomla.Platform
* @subpackage Session
*
* @copyright Copyright (C) 2005 - 2015 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die;
/**
* Database session storage handler for PHP
*
* @see http://www.php.net/manual/en/function.session-set-save-handler.php
* @since 11.1
*/
class JSessionStorageDatabase extends JSessionStorage
{
/**
* 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)
{
// Get the database connection object and verify its connected.
$db = JFactory::getDbo();
try
{
// Get the session data from the database table.
$query = $db->getQuery(true)
->select($db->quoteName('data'))
->from($db->quoteName('#__session'))
->where($db->quoteName('session_id') . ' = ' . $db->quote($id));
$db->setQuery($query);
$result = (string) $db->loadResult();
$result = str_replace('\0\0\0', chr(0) . '*' . chr(0), $result);
return $result;
}
catch (Exception $e)
{
return false;
}
}
/**
* Write session data to the SessionHandler backend.
*
* @param string $id The session identifier.
* @param string $data The session data.
*
* @return boolean True on success, false otherwise.
*
* @since 11.1
*/
public function write($id, $data)
{
// Get the database connection object and verify its connected.
$db = JFactory::getDbo();
$data = str_replace(chr(0) . '*' . chr(0), '\0\0\0', $data);
try
{
$query = $db->getQuery(true)
->update($db->quoteName('#__session'))
->set($db->quoteName('data') . ' = ' . $db->quote($data))
->set($db->quoteName('time') . ' = ' . $db->quote((int) time()))
->where($db->quoteName('session_id') . ' = ' . $db->quote($id));
// Try to update the session data in the database table.
$db->setQuery($query);
if (!$db->execute())
{
return false;
}
/* Since $db->execute did not throw an exception, so the query was successful.
Either the data changed, or the data was identical.
In either case we are done.
*/
return true;
}
catch (Exception $e)
{
return false;
}
}
/**
* 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)
{
// Get the database connection object and verify its connected.
$db = JFactory::getDbo();
try
{
$query = $db->getQuery(true)
->delete($db->quoteName('#__session'))
->where($db->quoteName('session_id') . ' = ' . $db->quote($id));
// Remove a session from the database.
$db->setQuery($query);
return (boolean) $db->execute();
}
catch (Exception $e)
{
return false;
}
}
/**
* Garbage collect stale sessions from the SessionHandler backend.
*
* @param integer $lifetime The maximum age of a session.
*
* @return boolean True on success, false otherwise.
*
* @since 11.1
*/
public function gc($lifetime = 1440)
{
// Get the database connection object and verify its connected.
$db = JFactory::getDbo();
// Determine the timestamp threshold with which to purge old sessions.
$past = time() - $lifetime;
try
{
$query = $db->getQuery(true)
->delete($db->quoteName('#__session'))
->where($db->quoteName('time') . ' < ' . $db->quote((int) $past));
// Remove expired sessions from the database.
$db->setQuery($query);
return (boolean) $db->execute();
}
catch (Exception $e)
{
return false;
}
}
}