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libraries/joomla/session/storage/database.php

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+<?php
+/**
+ * @package     Joomla.Platform
+ * @subpackage  Session
+ *
+ * @copyright   Copyright (C) 2005 - 2013 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
+ *
+ * @package     Joomla.Platform
+ * @subpackage  Session
+ * @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;
+		}
+	}
+}