Subversion-Projekte lars-tiefland.ci

<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2017, 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 - 2017, 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;
                }
        }

        // ------------------------------------------------------------------------

        /**
         * 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;
        }
}