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Chris Sewell
281
lib/symfony/storage/sfMySQLSessionStorage.class.php
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281
lib/symfony/storage/sfMySQLSessionStorage.class.php
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<?php
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/*
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* This file is part of the symfony package.
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* (c) 2004-2006 Fabien Potencier <fabien.potencier@symfony-project.com>
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* (c) 2004-2006 Sean Kerr.
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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/**
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* Provides support for session storage using a MySQL brand database.
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*
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* <b>Required parameters:</b>
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*
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* # <b>db_table</b> - [none] - The database table in which session data will be
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* stored.
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*
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* <b>Optional parameters:</b>
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*
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* # <b>db_id_col</b> - [sess_id] - The database column in which the
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* session id will be stored.
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* # <b>db_data_col</b> - [sess_data] - The database column in which the
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* session data will be stored.
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* # <b>db_time_col</b> - [sess_time] - The database column in which the
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* session timestamp will be stored.
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* # <b>session_name</b> - [symfony] - The name of the session.
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*
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* @package symfony
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* @subpackage storage
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* @author Fabien Potencier <fabien.potencier@symfony-project.com>
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* @author Sean Kerr <skerr@mojavi.org>
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* @version SVN: $Id: sfMySQLSessionStorage.class.php 4238 2007-06-18 12:14:36Z fabien $
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*/
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class sfMySQLSessionStorage extends sfSessionStorage
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{
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protected
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$resource = null;
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/**
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* Initializes this Storage instance.
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*
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* @param sfContext A sfContext instance
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* @param array An associative array of initialization parameters
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*
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* @return boolean true, if initialization completes successfully, otherwise false
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*
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* @throws <b>sfInitializationException</b> If an error occurs while initializing this Storage
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*/
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public function initialize($context, $parameters = null)
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{
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// disable auto_start
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$parameters['auto_start'] = false;
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// initialize the parent
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parent::initialize($context, $parameters);
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if (!$this->getParameterHolder()->has('db_table'))
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{
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// missing required 'db_table' parameter
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$error = 'Factory configuration file is missing required "db_table" parameter for the Storage category';
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throw new sfInitializationException($error);
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}
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// use this object as the session handler
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session_set_save_handler(array($this, 'sessionOpen'),
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array($this, 'sessionClose'),
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array($this, 'sessionRead'),
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array($this, 'sessionWrite'),
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array($this, 'sessionDestroy'),
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array($this, 'sessionGC'));
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// start our session
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session_start();
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}
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/**
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* Closes a session.
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*
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* @return boolean true, if the session was closed, otherwise false
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*/
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public function sessionClose()
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{
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// do nothing
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return true;
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}
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/**
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* Destroys a session.
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*
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* @param string A session ID
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*
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* @return boolean true, if the session was destroyed, otherwise an exception is thrown
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*
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* @throws <b>sfDatabaseException</b> If the session cannot be destroyed.
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*/
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public function sessionDestroy($id)
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{
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// get table/column
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$db_table = $this->getParameterHolder()->get('db_table');
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$db_id_col = $this->getParameterHolder()->get('db_id_col', 'sess_id');
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// cleanup the session id, just in case
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$id = mysql_real_escape_string($id, $this->resource);
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// delete the record associated with this id
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$sql = 'DELETE FROM '.$db_table.' WHERE '.$db_id_col.' = \''.$id.'\'';
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if (@mysql_query($sql, $this->resource))
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{
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return true;
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}
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// failed to destroy session
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$error = 'MySQLSessionStorage cannot destroy session id "%s"';
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$error = sprintf($error, $id);
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throw new sfDatabaseException($error);
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}
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/**
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* Cleans up old sessions.
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*
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* @param int The lifetime of a session
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*
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* @return boolean true, if old sessions have been cleaned, otherwise an exception is thrown
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*
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* @throws <b>sfDatabaseException</b> If any old sessions cannot be cleaned
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*/
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public function sessionGC($lifetime)
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{
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// determine deletable session time
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$time = time() - $lifetime;
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// get table/column
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$db_table = $this->getParameterHolder()->get('db_table');
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$db_time_col = $this->getParameterHolder()->get('db_time_col', 'sess_time');
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// delete the record associated with this id
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$sql = 'DELETE FROM '.$db_table.' '.
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'WHERE '.$db_time_col.' < '.$time;
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if (@mysql_query($sql, $this->resource))
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{
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return true;
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}
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// failed to cleanup old sessions
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$error = 'MySQLSessionStorage cannot delete old sessions';
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throw new sfDatabaseException($error);
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}
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/**
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* Opens a session.
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*
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* @param string
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* @param string
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*
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* @return boolean true, if the session was opened, otherwise an exception is thrown
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*
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* @throws <b>sfDatabaseException</b> If a connection with the database does not exist or cannot be created
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*/
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public function sessionOpen($path, $name)
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{
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// what database are we using?
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$database = $this->getParameterHolder()->get('database', 'default');
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// get the database resource
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$this->resource = $this->getContext()
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->getDatabaseManager()
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->getDatabase($database)
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->getResource();
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return true;
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}
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/**
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* Reads a session.
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*
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* @param string A session ID
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*
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* @return boolean true, if the session was read, otherwise an exception is thrown
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*
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* @throws <b>sfDatabaseException</b> If the session cannot be read
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*/
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public function sessionRead($id)
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{
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// get table/column
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$db_table = $this->getParameterHolder()->get('db_table');
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$db_data_col = $this->getParameterHolder()->get('db_data_col', 'sess_data');
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$db_id_col = $this->getParameterHolder()->get('db_id_col', 'sess_id');
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$db_time_col = $this->getParameterHolder()->get('db_time_col', 'sess_time');
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// cleanup the session id, just in case
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$id = mysql_real_escape_string($id, $this->resource);
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// delete the record associated with this id
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$sql = 'SELECT '.$db_data_col.' ' .
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'FROM '.$db_table.' ' .
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'WHERE '.$db_id_col.' = \''.$id.'\'';
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$result = @mysql_query($sql, $this->resource);
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if ($result != false && @mysql_num_rows($result) == 1)
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{
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// found the session
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$data = mysql_fetch_row($result);
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return $data[0];
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}
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else
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{
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// session does not exist, create it
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$sql = 'INSERT INTO '.$db_table.' ('.$db_id_col.', ' .
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$db_data_col.', '.$db_time_col.') VALUES (' .
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'\''.$id.'\', \'\', '.time().')';
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if (@mysql_query($sql, $this->resource))
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{
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return '';
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}
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// can't create record
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$error = 'MySQLSessionStorage cannot create new record for id "%s"';
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$error = sprintf($error, $id);
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throw new sfDatabaseException($error);
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}
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}
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/**
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* Writes session data.
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*
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* @param string A session ID
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* @param string A serialized chunk of session data
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*
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* @return boolean true, if the session was written, otherwise an exception is thrown
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*
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* @throws <b>sfDatabaseException</b> If the session data cannot be written
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*/
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public function sessionWrite($id, &$data)
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{
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// get table/column
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$db_table = $this->getParameterHolder()->get('db_table');
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$db_data_col = $this->getParameterHolder()->get('db_data_col', 'sess_data');
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$db_id_col = $this->getParameterHolder()->get('db_id_col', 'sess_id');
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$db_time_col = $this->getParameterHolder()->get('db_time_col', 'sess_time');
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// cleanup the session id and data, just in case
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$id = mysql_real_escape_string($id, $this->resource);
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$data = mysql_real_escape_string($data, $this->resource);
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// delete the record associated with this id
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$sql = 'UPDATE '.$db_table.' ' .
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'SET '.$db_data_col.' = \''.$data.'\', ' .
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$db_time_col.' = '.time().' ' .
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'WHERE '.$db_id_col.' = \''.$id.'\'';
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if (@mysql_query($sql, $this->resource))
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{
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return true;
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}
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// failed to write session data
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$error = 'MySQLSessionStorage cannot write session data for id "%s"';
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$error = sprintf($error, $id);
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throw new sfDatabaseException($error);
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}
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/**
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* Executes the shutdown procedure.
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*
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*/
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public function shutdown()
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{
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}
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}
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