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Revision Autor Zeilennr. Zeile
68 lars 1 
<?php
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/**
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 * CodeIgniter
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 *
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 * An open source application development framework for PHP
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 *
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 * This content is released under the MIT License (MIT)
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 *
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 * Copyright (c) 2014 - 2019, British Columbia Institute of Technology
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a copy
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 * of this software and associated documentation files (the "Software"), to deal
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 * in the Software without restriction, including without limitation the rights
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 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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 * copies of the Software, and to permit persons to whom the Software is
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 * furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included in
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 * all copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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 * THE SOFTWARE.
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 *
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 * @package	CodeIgniter
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 * @author	EllisLab Dev Team
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 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
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 * @copyright	Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
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 * @license	https://opensource.org/licenses/MIT	MIT License
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 * @link	https://codeigniter.com
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 * @since	Version 3.0.0
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 * @filesource
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 */
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defined('BASEPATH') OR exit('No direct script access allowed');
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/**
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 * CodeIgniter Session Driver Class
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 *
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 * @package	CodeIgniter
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 * @subpackage	Libraries
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 * @category	Sessions
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 * @author	Andrey Andreev
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 * @link	https://codeigniter.com/user_guide/libraries/sessions.html
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 */
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abstract class CI_Session_driver implements SessionHandlerInterface {
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	protected $_config;
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	/**
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	 * Data fingerprint
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	 *
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	 * @var	bool
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	 */
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	protected $_fingerprint;
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	/**
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	 * Lock placeholder
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	 *
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	 * @var	mixed
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	 */
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	protected $_lock = FALSE;
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	/**
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	 * Read session ID
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	 *
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	 * Used to detect session_regenerate_id() calls because PHP only calls
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	 * write() after regenerating the ID.
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	 *
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	 * @var	string
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	 */
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	protected $_session_id;
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	/**
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	 * Success and failure return values
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	 *
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	 * Necessary due to a bug in all PHP 5 versions where return values
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	 * from userspace handlers are not handled properly. PHP 7 fixes the
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	 * bug, so we need to return different values depending on the version.
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	 *
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	 * @see	https://wiki.php.net/rfc/session.user.return-value
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	 * @var	mixed
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	 */
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	protected $_success, $_failure;
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	// ------------------------------------------------------------------------
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	/**
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	 * Class constructor
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	 *
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	 * @param	array	$params	Configuration parameters
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	 * @return	void
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	 */
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	public function __construct(&$params)
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	{
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		$this->_config =& $params;
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		if (is_php('7'))
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		{
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			$this->_success = TRUE;
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			$this->_failure = FALSE;
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		}
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		else
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		{
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			$this->_success = 0;
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			$this->_failure = -1;
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		}
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	}
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	// ------------------------------------------------------------------------
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	/**
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	 * PHP 5.x validate ID
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	 *
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	 * Enforces session.use_strict_mode
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	 *
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	 * @return	void
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	 */
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	public function php5_validate_id()
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	{
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		if (isset($_COOKIE[$this->_config['cookie_name']]) && ! $this->validateSessionId($_COOKIE[$this->_config['cookie_name']]))
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		{
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			unset($_COOKIE[$this->_config['cookie_name']]);
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		}
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	}
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	// ------------------------------------------------------------------------
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	/**
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	 * Cookie destroy
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	 *
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	 * Internal method to force removal of a cookie by the client
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	 * when session_destroy() is called.
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	 *
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	 * @return	bool
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	 */
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	protected function _cookie_destroy()
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	{
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		return setcookie(
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			$this->_config['cookie_name'],
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			NULL,
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			1,
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			$this->_config['cookie_path'],
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			$this->_config['cookie_domain'],
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			$this->_config['cookie_secure'],
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			TRUE
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		);
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	}
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	// ------------------------------------------------------------------------
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	/**
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	 * Get lock
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	 *
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	 * A dummy method allowing drivers with no locking functionality
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	 * (databases other than PostgreSQL and MySQL) to act as if they
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	 * do acquire a lock.
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	 *
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	 * @param	string	$session_id
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	 * @return	bool
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	 */
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	protected function _get_lock($session_id)
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	{
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		$this->_lock = TRUE;
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		return TRUE;
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	}
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	// ------------------------------------------------------------------------
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	/**
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	 * Release lock
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	 *
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	 * @return	bool
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	 */
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	protected function _release_lock()
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	{
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		if ($this->_lock)
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		{
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			$this->_lock = FALSE;
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		}
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		return TRUE;
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	}
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}