/**
* @return RequestMatcherInterface|UrlMatcherInterface
*/
public function getMatcher()
{
/* we may not set the context in DynamicRouter::setContext as this
* would lead to symfony cache warmup problems.
* a request matcher does not need the request context separately as it
* can get it from the request.
*/
if ($this->matcher instanceof RequestContextAwareInterface) {
$this->matcher->setContext($this->getContext());
}
return $this->matcher;
}
/**
* Makes a subrequest to retrieve the default error page.
*
* @param \Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent $event
* The event to process.
* @param string $url
* The path/url to which to make a subrequest for this error message.
* @param int $status_code
* The status code for the error being handled.
*/
protected function makeSubrequest(GetResponseForExceptionEvent $event, $url, $status_code)
{
$request = $event->getRequest();
$exception = $event->getException();
try {
// Reuse the exact same request (so keep the same URL, keep the access
// result, the exception, et cetera) but override the routing information.
// This means that aside from routing, this is identical to the master
// request. This allows us to generate a response that is executed on
// behalf of the master request, i.e. for the original URL. This is what
// allows us to e.g. generate a 404 response for the original URL; if we
// would execute a subrequest with the 404 route's URL, then it'd be
// generated for *that* URL, not the *original* URL.
$sub_request = clone $request;
// The routing to the 404 page should be done as GET request because it is
// restricted to GET and POST requests only. Otherwise a DELETE request
// would for example trigger a method not allowed exception.
$request_context = clone $this->accessUnawareRouter->getContext();
$request_context->setMethod('GET');
$this->accessUnawareRouter->setContext($request_context);
$sub_request->attributes->add($this->accessUnawareRouter->match($url));
// Add to query (GET) or request (POST) parameters:
// - 'destination' (to ensure e.g. the login form in a 403 response
// redirects to the original URL)
// - '_exception_statuscode'
$parameters = $sub_request->isMethod('GET') ? $sub_request->query : $sub_request->request;
$parameters->add($this->redirectDestination->getAsArray() + ['_exception_statuscode' => $status_code]);
$response = $this->httpKernel->handle($sub_request, HttpKernelInterface::SUB_REQUEST);
// Only 2xx responses should have their status code overridden; any
// other status code should be passed on: redirects (3xx), error (5xx)…
// @see https://www.drupal.org/node/2603788#comment-10504916
if ($response->isSuccessful()) {
$response->setStatusCode($status_code);
}
// Persist any special HTTP headers that were set on the exception.
if ($exception instanceof HttpExceptionInterface) {
$response->headers->add($exception->getHeaders());
}
$event->setResponse($response);
} catch (\Exception $e) {
// If an error happened in the subrequest we can't do much else. Instead,
// just log it. The DefaultExceptionSubscriber will catch the original
// exception and handle it normally.
$error = Error::decodeException($e);
$this->logger->log($error['severity_level'], '%type: @message in %function (line %line of %file).', $error);
}
}
