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<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP 5.2.4 or newer
*
* NOTICE OF LICENSE
*
* Licensed under the Open Software License version 3.0
*
* This source file is subject to the Open Software License (OSL 3.0) that is
* bundled with this package in the files license.txt / license.rst. It is
* also available through the world wide web at this URL:
* http://opensource.org/licenses/OSL-3.0
* If you did not receive a copy of the license and are unable to obtain it
* through the world wide web, please send an email to
* licensing@ellislab.com so we can send you a copy immediately.
*
* @package CodeIgniter
* @author Andrey Andreev
* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (http://ellislab.com/)
* @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
* @link http://codeigniter.com
* @since Version 3.0
* @filesource
*/
defined('BASEPATH') OR exit('No direct script access allowed');
/**
* CodeIgniter Session Database Driver
*
* @package CodeIgniter
* @subpackage Libraries
* @category Sessions
* @author Andrey Andreev
* @link http://codeigniter.com/user_guide/libraries/sessions.html
*/
class CI_Session_database_driver extends CI_Session_driver implements SessionHandlerInterface {
/**
* DB object
*
* @var object
*/
protected $_db;
/**
* DB table
*
* @var string
*/
protected $_table;
/**
* Row exists flag
*
* @var bool
*/
protected $_row_exists = FALSE;
/**
* Lock "driver" flag
*
* @var string
*/
protected $_lock_driver = 'semaphore';
// ------------------------------------------------------------------------
/**
* Class constructor
*
* @param array $params Configuration parameters
* @return void
*/
public function __construct(&$params)
{
parent::__construct($params);
$CI =& get_instance();
isset($CI->db) OR $CI->load->database();
$this->_db =& $CI->db;
if ( ! $this->_db instanceof CI_DB_query_builder)
{
throw new Exception('Query Builder not enabled for the configured database. Aborting.');
}
elseif ($this->_db->pconnect)
{
throw new Exception('Configured database connection is persistent. Aborting.');
}
$db_driver = $this->_db->dbdriver.(empty($this->_db->subdriver) ? '' : '_'.$this->_db->subdriver);
if (strpos($db_driver, 'mysql') !== FALSE)
{
$this->_lock_driver = 'mysql';
}
elseif (in_array($db_driver, array('postgre', 'pdo_pgsql'), TRUE))
{
$this->_lock_driver = 'postgre';
}
isset($this->_table) OR $this->_table = config_item('sess_table_name');
}
// ------------------------------------------------------------------------
public function open($save_path, $name)
{
return empty($this->_db->conn_id)
? ( ! $this->_db->autoinit && $this->_db->db_connect())
: TRUE;
}
// ------------------------------------------------------------------------
public function read($session_id)
{
if ($this->_get_lock() !== FALSE)
{
$this->_db
->select('data')
->from($this->_table)
->where('id', $session_id);
if ($this->_match_ip)
{
$this->_db->where('ip_address', $_SERVER['REMOTE_ADDR']);
}
if (($result = $this->_db->get()->row()) === NULL)
{
$this->_fingerprint = md5('');
return '';
}
$this->_fingerprint = md5(rtrim($result->data));
$this->_row_exists = TRUE;
return $result->data;
}
$this->_fingerprint = md5('');
return '';
}
public function write($session_id, $session_data)
{
if ($this->_lock === FALSE)
{
return FALSE;
}
if ($this->_row_exists === FALSE)
{
if ($this->_db->insert($this->_table, array('id' => $session_id, 'ip_address' => $_SERVER['REMOTE_ADDR'], 'timestamp' => time(), 'data' => $session_data)))
{
$this->_fingerprint = md5($session_data);
return $this->_row_exists = TRUE;
}
return FALSE;
}
$this->_db->where('id', $session_id);
if ($this->_match_ip)
{
$this->_db->where('ip_address', $_SERVER['REMOTE_ADDR']);
}
$update_data = ($this->_fingerprint === md5($session_data))
? array('timestamp' => time())
: array('timestamp' => time(), 'data' => $session_data);
if ($this->_db->update($this->_table, $update_data))
{
$this->_fingerprint = md5($session_data);
return TRUE;
}
return FALSE;
}
// ------------------------------------------------------------------------
public function close()
{
return ($this->_lock)
? $this->_release_lock()
: TRUE;
}
// ------------------------------------------------------------------------
public function destroy($session_id)
{
if ($this->_lock)
{
$this->_db->where('id', $session_id);
if ($this->_match_ip)
{
$this->_db->where('ip_address', $_SERVER['REMOTE_ADDR']);
}
return $this->_db->delete($this->_table)
? ($this->close() && $this->_cookie_destroy())
: FALSE;
}
return ($this->close() && $this->_cookie_destroy());
}
// ------------------------------------------------------------------------
public function gc($maxlifetime)
{
return $this->_db->delete($this->_table, 'timestamp < '.(time() - $maxlifetime));
}
// ------------------------------------------------------------------------
protected function _get_lock($session_id)
{
if ($this->_lock_driver === 'mysql')
{
$arg = $session_id.($this->_match_ip ? '_'.$_SERVER['REMOTE_ADDR'] : '');
if ($this->_db->query("SELECT GET_LOCK('".$arg."', 10) AS ci_session_lock")->row()->ci_session_lock)
{
$this->_lock = $arg;
return TRUE;
}
return FALSE;
}
elseif ($this->_lock_driver === 'postgre')
{
$arg = "hashtext('".$session_id."')".($this->_match_ip ? ", hashtext('".$_SERVER['REMOTE_ADDR']."')" : '');
if ($this->_db->simple_query('SELECT pg_advisory_lock('.$arg.')'))
{
$this->_lock = $arg;
return TRUE;
}
return FALSE;
}
return parent::_get_lock($session_id);
}
// ------------------------------------------------------------------------
protected function _release_lock()
{
if ( ! $this->_lock)
{
return TRUE;
}
if ($this->_lock_driver === 'mysql')
{
if ($this->_db->query("SELECT RELEASE_LOCK('".$this->_lock."') AS ci_session_lock")->row()->ci_session_lock)
{
$this->_lock = FALSE;
return TRUE;
}
return FALSE;
}
elseif ($this->_lock_driver === 'postgre')
{
if ($this->_db->simple_query('SELECT pg_advisory_unlock('.$this->_lock.')'))
{
$this->_lock = FALSE;
return TRUE;
}
return FALSE;
}
return parent::_release_lock();
}
}
/* End of file Session_database_driver.php */
/* Location: ./system/libraries/Session/drivers/Session_database_driver.php */
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