Subversion Repositories SmartDukaan

<?php
/**
 * Database Session save handler. Allows saving session information into a model.
 *
 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
 * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 *
 * Licensed under The MIT License
 * For full copyright and license information, please see the LICENSE.txt
 * Redistributions of files must retain the above copyright notice.
 *
 * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 * @link          http://cakephp.org CakePHP(tm) Project
 * @package       Cake.Model.Datasource.Session
 * @since         CakePHP(tm) v 2.0
 * @license       http://www.opensource.org/licenses/mit-license.php MIT License
 */

App::uses('CakeSessionHandlerInterface', 'Model/Datasource/Session');
App::uses('ClassRegistry', 'Utility');

/**
 * DatabaseSession provides methods to be used with CakeSession.
 *
 * @package       Cake.Model.Datasource.Session
 */
class DatabaseSession implements CakeSessionHandlerInterface {

/**
 * Reference to the model handling the session data
 *
 * @var Model
 */
        protected $_model;

/**
 * Number of seconds to mark the session as expired
 *
 * @var int
 */
        protected $_timeout;

/**
 * Constructor. Looks at Session configuration information and
 * sets up the session model.
 *
 */
        public function __construct() {
                $modelName = Configure::read('Session.handler.model');

                if (empty($modelName)) {
                        $settings = array(
                                'class' => 'Session',
                                'alias' => 'Session',
                                'table' => 'cake_sessions',
                        );
                } else {
                        $settings = array(
                                'class' => $modelName,
                                'alias' => 'Session',
                        );
                }
                $this->_model = ClassRegistry::init($settings);
                $this->_timeout = Configure::read('Session.timeout') * 60;
        }

/**
 * Method called on open of a database session.
 *
 * @return bool Success
 */
        public function open() {
                return true;
        }

/**
 * Method called on close of a database session.
 *
 * @return bool Success
 */
        public function close() {
                return true;
        }

/**
 * Method used to read from a database session.
 *
 * @param int|string $id The key of the value to read
 * @return mixed The value of the key or false if it does not exist
 */
        public function read($id) {
                $row = $this->_model->find('first', array(
                        'conditions' => array($this->_model->primaryKey => $id)
                ));

                if (empty($row[$this->_model->alias]['data'])) {
                        return false;
                }

                return $row[$this->_model->alias]['data'];
        }

/**
 * Helper function called on write for database sessions.
 *
 * Will retry, once, if the save triggers a PDOException which
 * can happen if a race condition is encountered
 *
 * @param int $id ID that uniquely identifies session in database
 * @param mixed $data The value of the data to be saved.
 * @return bool True for successful write, false otherwise.
 */
        public function write($id, $data) {
                if (!$id) {
                        return false;
                }
                $expires = time() + $this->_timeout;
                $record = compact('id', 'data', 'expires');
                $record[$this->_model->primaryKey] = $id;

                $options = array(
                        'validate' => false,
                        'callbacks' => false,
                        'counterCache' => false
                );
                try {
                        return $this->_model->save($record, $options);
                } catch (PDOException $e) {
                        return $this->_model->save($record, $options);
                }
        }

/**
 * Method called on the destruction of a database session.
 *
 * @param int $id ID that uniquely identifies session in database
 * @return bool True for successful delete, false otherwise.
 */
        public function destroy($id) {
                return $this->_model->delete($id);
        }

/**
 * Helper function called on gc for database sessions.
 *
 * @param int $expires Timestamp (defaults to current time)
 * @return bool Success
 */
        public function gc($expires = null) {
                if (!$expires) {
                        $expires = time();
                } else {
                        $expires = time() - $expires;
                }
                return $this->_model->deleteAll(array($this->_model->alias . ".expires <" => $expires), false, false);
        }

}