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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Security\Csrf\TokenStorage;
use Symfony\Component\Security\Csrf\Exception\TokenNotFoundException;
/**
* Token storage that uses PHP's native session handling.
*
* @since 2.4
*
* @author Bernhard Schussek <bschussek@gmail.com>
*/
class NativeSessionTokenStorage implements ClearableTokenStorageInterface
{
/**
* The namespace used to store values in the session.
*
* @var string
*/
const SESSION_NAMESPACE = '_csrf';
/**
* @var bool
*/
private $sessionStarted = false;
/**
* @var string
*/
private $namespace;
/**
* Initializes the storage with a session namespace.
*
* @param string $namespace The namespace under which the token is stored
* in the session
*/
public function __construct($namespace = self::SESSION_NAMESPACE)
{
$this->namespace = $namespace;
}
/**
* {@inheritdoc}
*/
public function getToken($tokenId)
{
if (!$this->sessionStarted) {
$this->startSession();
}
if (!isset($_SESSION[$this->namespace][$tokenId])) {
throw new TokenNotFoundException('The CSRF token with ID '.$tokenId.' does not exist.');
}
return (string) $_SESSION[$this->namespace][$tokenId];
}
/**
* {@inheritdoc}
*/
public function setToken($tokenId, $token)
{
if (!$this->sessionStarted) {
$this->startSession();
}
$_SESSION[$this->namespace][$tokenId] = (string) $token;
}
/**
* {@inheritdoc}
*/
public function hasToken($tokenId)
{
if (!$this->sessionStarted) {
$this->startSession();
}
return isset($_SESSION[$this->namespace][$tokenId]);
}
/**
* {@inheritdoc}
*/
public function removeToken($tokenId)
{
if (!$this->sessionStarted) {
$this->startSession();
}
$token = isset($_SESSION[$this->namespace][$tokenId])
? (string) $_SESSION[$this->namespace][$tokenId]
: null;
unset($_SESSION[$this->namespace][$tokenId]);
return $token;
}
/**
* {@inheritdoc}
*/
public function clear()
{
unset($_SESSION[$this->namespace]);
}
private function startSession()
{
if (PHP_VERSION_ID >= 50400) {
if (PHP_SESSION_NONE === session_status()) {
session_start();
}
} elseif (!session_id()) {
session_start();
}
$this->sessionStarted = true;
}
}
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