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<?php
/**
* Database Session save handler. Allows saving session information into a model.
*
* 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\ORM\Entity;
use Cake\ORM\Locator\LocatorAwareTrait;
use SessionHandlerInterface;
/**
* DatabaseSession provides methods to be used with Session.
*/
class DatabaseSession implements SessionHandlerInterface
{
use LocatorAwareTrait;
/**
* Reference to the table handling the session data
*
* @var \Cake\ORM\Table
*/
protected $_table;
/**
* 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.
*
* @param array $config The configuration for this engine. It requires the 'model'
* key to be present corresponding to the Table to use for managing the sessions.
*/
public function __construct(array $config = [])
{
if (isset($config['tableLocator'])) {
$this->setTableLocator($config['tableLocator']);
}
$tableLocator = $this->getTableLocator();
if (empty($config['model'])) {
$config = $tableLocator->exists('Sessions') ? [] : ['table' => 'sessions'];
$this->_table = $tableLocator->get('Sessions', $config);
} else {
$this->_table = $tableLocator->get($config['model']);
}
$this->_timeout = ini_get('session.gc_maxlifetime');
}
/**
* Set the timeout value for sessions.
*
* Primarily used in testing.
*
* @param int $timeout The timeout duration.
* @return $this
*/
public function setTimeout($timeout)
{
$this->_timeout = $timeout;
return $this;
}
/**
* 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 database session.
*
* @param string|int $id ID that uniquely identifies session in database.
* @return string Session data or empty string if it does not exist.
*/
public function read($id)
{
$result = $this->_table
->find('all')
->select(['data'])
->where([$this->_table->getPrimaryKey() => $id])
->enableHydration(false)
->first();
if (empty($result)) {
return '';
}
if (is_string($result['data'])) {
return $result['data'];
}
$session = stream_get_contents($result['data']);
if ($session === false) {
return '';
}
return $session;
}
/**
* Helper function called on write for database sessions.
*
* @param string|int $id ID that uniquely identifies session in database.
* @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;
}
$expires = time() + $this->_timeout;
$record = compact('data', 'expires');
$record[$this->_table->getPrimaryKey()] = $id;
$result = $this->_table->save(new Entity($record));
return (bool)$result;
}
/**
* Method called on the destruction of a database session.
*
* @param string|int $id ID that uniquely identifies session in database.
* @return bool True for successful delete, false otherwise.
*/
public function destroy($id)
{
$this->_table->delete(new Entity(
[$this->_table->getPrimaryKey() => $id],
['markNew' => false]
));
return true;
}
/**
* Helper function called on gc for database sessions.
*
* @param int $maxlifetime Sessions that have not updated for the last maxlifetime seconds will be removed.
* @return bool True on success, false on failure.
*/
public function gc($maxlifetime)
{
$this->_table->deleteAll(['expires <' => time()]);
return true;
}
}