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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;

	}

}