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<?php
namespace Drupal\Core\Session;
use Drupal\Component\Utility\Crypt;
use Drupal\Core\Database\Connection;
use Drupal\Core\DependencyInjection\DependencySerializationTrait;
use Drupal\Core\Utility\Error;
use Symfony\Component\HttpFoundation\RequestStack;
use Symfony\Component\HttpFoundation\Session\Storage\Proxy\AbstractProxy;
/**
* Default session handler.
*/
class SessionHandler extends AbstractProxy implements \SessionHandlerInterface {
use DependencySerializationTrait;
/**
* The request stack.
*
* @var \Symfony\Component\HttpFoundation\RequestStack
*/
protected $requestStack;
/**
* The database connection.
*
* @var \Drupal\Core\Database\Connection
*/
protected $connection;
/**
* Constructs a new SessionHandler instance.
*
* @param \Symfony\Component\HttpFoundation\RequestStack $request_stack
* The request stack.
* @param \Drupal\Core\Database\Connection $connection
* The database connection.
*/
public function __construct(RequestStack $request_stack, Connection $connection) {
$this->requestStack = $request_stack;
$this->connection = $connection;
}
/**
* {@inheritdoc}
*/
public function open($save_path, $name) {
return TRUE;
}
/**
* {@inheritdoc}
*/
public function read($sid) {
$data = '';
if (!empty($sid)) {
// Read the session data from the database.
$query = $this->connection
->queryRange('SELECT session FROM {sessions} WHERE sid = :sid', 0, 1, [':sid' => Crypt::hashBase64($sid)]);
$data = (string) $query->fetchField();
}
return $data;
}
/**
* {@inheritdoc}
*/
public function write($sid, $value) {
// The exception handler is not active at this point, so we need to do it
// manually.
try {
$request = $this->requestStack->getCurrentRequest();
$fields = [
'uid' => $request->getSession()->get('uid', 0),
'hostname' => $request->getClientIP(),
'session' => $value,
'timestamp' => REQUEST_TIME,
];
$this->connection->merge('sessions')
->keys(['sid' => Crypt::hashBase64($sid)])
->fields($fields)
->execute();
return TRUE;
}
catch (\Exception $exception) {
require_once DRUPAL_ROOT . '/core/includes/errors.inc';
// If we are displaying errors, then do so with no possibility of a
// further uncaught exception being thrown.
if (error_displayable()) {
print '<h1>Uncaught exception thrown in session handler.</h1>';
print '<p>' . Error::renderExceptionSafe($exception) . '</p><hr />';
}
return FALSE;
}
}
/**
* {@inheritdoc}
*/
public function close() {
return TRUE;
}
/**
* {@inheritdoc}
*/
public function destroy($sid) {
// Delete session data.
$this->connection->delete('sessions')
->condition('sid', Crypt::hashBase64($sid))
->execute();
return TRUE;
}
/**
* {@inheritdoc}
*/
public function gc($lifetime) {
// Be sure to adjust 'php_value session.gc_maxlifetime' to a large enough
// value. For example, if you want user sessions to stay in your database
// for three weeks before deleting them, you need to set gc_maxlifetime
// to '1814400'. At that value, only after a user doesn't log in after
// three weeks (1814400 seconds) will his/her session be removed.
$this->connection->delete('sessions')
->condition('timestamp', REQUEST_TIME - $lifetime, '<')
->execute();
return TRUE;
}
}