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<?php | |
/** | |
* @file | |
* Contains \Drupal\Core\Access\CsrfAccessCheck. | |
*/ | |
namespace Drupal\Core\Access; | |
use Drupal\Core\Routing\Access\AccessInterface as RoutingAccessInterface; | |
use Drupal\Core\Routing\RouteMatchInterface; | |
use Symfony\Component\Routing\Route; | |
use Symfony\Component\HttpFoundation\Request; | |
/** | |
* Allows access to routes to be controlled by a '_csrf_token' parameter. | |
* | |
* To use this check, add a "token" GET parameter to URLs of which the value is | |
* a token generated by \Drupal::csrfToken()->get() using the same value as the | |
* "_csrf_token" parameter in the route. | |
*/ | |
class CsrfAccessCheck implements RoutingAccessInterface { | |
/** | |
* The CSRF token generator. | |
* | |
* @var \Drupal\Core\Access\CsrfTokenGenerator | |
*/ | |
protected $csrfToken; | |
/** | |
* Constructs a CsrfAccessCheck object. | |
* | |
* @param \Drupal\Core\Access\CsrfTokenGenerator $csrf_token | |
* The CSRF token generator. | |
*/ | |
public function __construct(CsrfTokenGenerator $csrf_token) { | |
$this->csrfToken = $csrf_token; | |
} | |
/** | |
* Checks access based on a CSRF token for the request. | |
* | |
* @param \Symfony\Component\Routing\Route $route | |
* The route to check against. | |
* @param \Symfony\Component\HttpFoundation\Request $request | |
* The request object. | |
* @param \Drupal\Core\Routing\RouteMatchInterface $route_match | |
* The route match object. | |
* | |
* @return \Drupal\Core\Access\AccessResultInterface | |
* The access result. | |
*/ | |
public function access(Route $route, Request $request, RouteMatchInterface $route_match) { | |
$parameters = $route_match->getRawParameters(); | |
$path = ltrim($route->getPath(), '/'); | |
// Replace the path parameters with values from the parameters array. | |
foreach ($parameters as $param => $value) { | |
$path = str_replace("{{$param}}", $value, $path); | |
} | |
if ($this->csrfToken->validate($request->query->get('token'), $path)) { | |
$result = AccessResult::allowed(); | |
} | |
else { | |
$result = AccessResult::forbidden(); | |
} | |
// Not cacheable because the CSRF token is highly dynamic. | |
return $result->setCacheMaxAge(0); | |
} | |
} |