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<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP
*
* This content is released under the MIT License (MIT)
*
* Copyright (c) 2014 - 2018, British Columbia Institute of Technology
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* @package CodeIgniter
* @author EllisLab Dev Team
* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
* @copyright Copyright (c) 2014 - 2018, British Columbia Institute of Technology (http://bcit.ca/)
* @license http://opensource.org/licenses/MIT MIT License
* @link https://codeigniter.com
* @since Version 3.0.0
* @filesource
*/
defined('BASEPATH') OR exit('No direct script access allowed');
/**
* CodeIgniter Session Driver Class
*
* @package CodeIgniter
* @subpackage Libraries
* @category Sessions
* @author Andrey Andreev
* @link https://codeigniter.com/user_guide/libraries/sessions.html
*/
abstract class CI_Session_driver implements SessionHandlerInterface {
protected $_config;
/**
* Data fingerprint
*
* @var bool
*/
protected $_fingerprint;
/**
* Lock placeholder
*
* @var mixed
*/
protected $_lock = FALSE;
/**
* Read session ID
*
* Used to detect session_regenerate_id() calls because PHP only calls
* write() after regenerating the ID.
*
* @var string
*/
protected $_session_id;
/**
* Success and failure return values
*
* Necessary due to a bug in all PHP 5 versions where return values
* from userspace handlers are not handled properly. PHP 7 fixes the
* bug, so we need to return different values depending on the version.
*
* @see https://wiki.php.net/rfc/session.user.return-value
* @var mixed
*/
protected $_success, $_failure;
// ------------------------------------------------------------------------
/**
* Class constructor
*
* @param array $params Configuration parameters
* @return void
*/
public function __construct(&$params)
{
$this->_config =& $params;
if (is_php('7'))
{
$this->_success = TRUE;
$this->_failure = FALSE;
}
else
{
$this->_success = 0;
$this->_failure = -1;
}
}
// ------------------------------------------------------------------------
/**
* PHP 5.x validate ID
*
* Enforces session.use_strict_mode on PHP 5.x (7+ does it by itself)
*
* @return void
*/
public function php5_validate_id()
{
if (PHP_VERSION_ID < 70000 && isset($_COOKIE[$this->_config['cookie_name']]) && ! $this->validateId($_COOKIE[$this->_config['cookie_name']]))
{
unset($_COOKIE[$this->_config['cookie_name']]);
}
}
// ------------------------------------------------------------------------
/**
* Cookie destroy
*
* Internal method to force removal of a cookie by the client
* when session_destroy() is called.
*
* @return bool
*/
protected function _cookie_destroy()
{
return setcookie(
$this->_config['cookie_name'],
NULL,
1,
$this->_config['cookie_path'],
$this->_config['cookie_domain'],
$this->_config['cookie_secure'],
TRUE
);
}
// ------------------------------------------------------------------------
/**
* Get lock
*
* A dummy method allowing drivers with no locking functionality
* (databases other than PostgreSQL and MySQL) to act as if they
* do acquire a lock.
*
* @param string $session_id
* @return bool
*/
protected function _get_lock($session_id)
{
$this->_lock = TRUE;
return TRUE;
}
// ------------------------------------------------------------------------
/**
* Release lock
*
* @return bool
*/
protected function _release_lock()
{
if ($this->_lock)
{
$this->_lock = FALSE;
}
return TRUE;
}
// ------------------------------------------------------------------------
/**
* Fail
*
* Drivers other than the 'files' one don't (need to) use the
* session.save_path INI setting, but that leads to confusing
* error messages emitted by PHP when open() or write() fail,
* as the message contains session.save_path ...
* To work around the problem, the drivers will call this method
* so that the INI is set just in time for the error message to
* be properly generated.
*
* @return mixed
*/
protected function _fail()
{
ini_set('session.save_path', config_item('sess_save_path'));
return $this->_failure;
}
}
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