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<?php
/**
* Cache Session save handler. Allows saving session information into Cache.
*
* CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
* Copyright (c) Cake Software Foundation, Inc. (https://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. (https://cakefoundation.org)
* @link https://cakephp.org CakePHP(tm) Project
* @since 2.0.0
* @license https://opensource.org/licenses/mit-license.php MIT License
*/
namespace Cake\Http\Session;
use Cake\Cache\Cache;
use InvalidArgumentException;
use SessionHandlerInterface;
/**
* CacheSession provides method for saving sessions into a Cache engine. Used with Session
*
* @see \Cake\Model\Datasource\Session for configuration information.
*/
class CacheSession implements SessionHandlerInterface
{
/**
* Options for this session engine
*
* @var array
*/
protected $_options = [];
/**
* Constructor.
*
* @param array $config The configuration to use for this engine
* It requires the key 'config' which is the name of the Cache config to use for
* storing the session
*
* @throws \InvalidArgumentException if the 'config' key is not provided
*/
public function __construct(array $config = [])
{
if (empty($config['config'])) {
throw new InvalidArgumentException('The cache configuration name to use is required');
}
$this->_options = $config;
}
/**
* Method called on open of a database session.
*
* @param string $savePath The path where to store/retrieve the session.
* @param string $name The session name.
* @return bool Success
*/
public function open($savePath, $name)
{
return true;
}
/**
* Method called on close of a database session.
*
* @return bool Success
*/
public function close()
{
return true;
}
/**
* Method used to read from a cache session.
*
* @param string|int $id ID that uniquely identifies session in cache.
* @return string Session data or empty string if it does not exist.
*/
public function read($id)
{
$value = Cache::read($id, $this->_options['config']);
if (empty($value)) {
return '';
}
return $value;
}
/**
* Helper function called on write for cache sessions.
*
* @param string|int $id ID that uniquely identifies session in cache.
* @param mixed $data The data to be saved.
* @return bool True for successful write, false otherwise.
*/
public function write($id, $data)
{
if (!$id) {
return false;
}
return (bool)Cache::write($id, $data, $this->_options['config']);
}
/**
* Method called on the destruction of a cache session.
*
* @param string|int $id ID that uniquely identifies session in cache.
* @return bool Always true.
*/
public function destroy($id)
{
Cache::delete($id, $this->_options['config']);
return true;
}
/**
* Helper function called on gc for cache sessions.
*
* @param int $maxlifetime Sessions that have not updated for the last maxlifetime seconds will be removed.
* @return bool Always true.
*/
public function gc($maxlifetime)
{
Cache::gc($this->_options['config'], time() - $maxlifetime);
return true;
}
}