public function ViewSubscriber::onView

Processes a successful controller into an HTTP 200 response.

Some controllers may not return a response object but simply the body of one. The VIEW event is called in that case, to allow us to mutate that body into a Response object. In particular we assume that the return from an JSON-type response is a JSON string, so just wrap it into a Response object.

Parameters

Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent $event: The Event to process.

File

drupal/core/lib/Drupal/Core/EventSubscriber/ViewSubscriber.php, line 46

Definition of Drupal\Core\EventSubscriber\ViewSubscriber.

Class

ViewSubscriber

Main subscriber for VIEW HTTP responses.

Namespace

Code

public function onView(GetResponseForControllerResultEvent $event) {
  $request = $event
    ->getRequest();

  // For a master request, we process the result and wrap it as needed.
  // For a subrequest, all we want is the string value.  We assume that
  // is just an HTML string from a controller, so wrap that into a response
  // object.  The subrequest's response will get dissected and placed into
  // the larger page as needed.
  if ($event
    ->getRequestType() == HttpKernelInterface::MASTER_REQUEST) {
    $method = 'on' . $this->negotiation
      ->getContentType($request);
    if (method_exists($this, $method)) {
      $event
        ->setResponse($this
        ->{$method}($event));
    }
    else {
      $event
        ->setResponse(new Response('Unsupported Media Type', 415));
    }
  }
  elseif ($request->attributes
    ->get('_legacy')) {

    // This is an old hook_menu-based subrequest, which means we assume
    // the body is supposed to be the complete page.
    $page_result = $event
      ->getControllerResult();
    if (!is_array($page_result)) {
      $page_result = array(
        '#markup' => $page_result,
      );
    }
    $event
      ->setResponse(new Response(drupal_render_page($page_result)));
  }
  else {

    // This is a new-style Symfony-esque subrequest, which means we assume
    // the body is not supposed to be a complete page but just a page
    // fragment.
    $page_result = $event
      ->getControllerResult();
    if (!is_array($page_result)) {
      $page_result = array(
        '#markup' => $page_result,
      );
    }
    $event
      ->setResponse(new Response(drupal_render($page_result)));
  }
}