function AjaxResponseSubscriber::onResponse

Renders the ajax commands right before preparing the result.

Parameters

\Symfony\Component\HttpKernel\Event\FilterResponseEvent $event: The response event, which contains the possible AjaxResponse object.

File

core/lib/Drupal/Core/EventSubscriber/AjaxResponseSubscriber.php, line 59

Class

AjaxResponseSubscriber

Response subscriber to handle AJAX responses.

Namespace

Code

public function onResponse(FilterResponseEvent $event) {
    $response = $event->getResponse();
    if ($response instanceof AjaxResponse) {
        $this->ajaxResponseAttachmentsProcessor
            ->processAttachments($response);
        // IE 9 does not support XHR 2 (http://caniuse.com/#feat=xhr2), so
        // for that browser, jquery.form submits requests containing a file upload
        // via an IFRAME rather than via XHR. Since the response is being sent to
        // an IFRAME, it must be formatted as HTML. Specifically:
        // - It must use the text/html content type or else the browser will
        //   present a download prompt. Note: This applies to both file uploads
        //   as well as any ajax request in a form with a file upload form.
        // - It must place the JSON data into a textarea to prevent browser
        //   extensions such as Linkification and Skype's Browser Highlighter
        //   from applying HTML transformations such as URL or phone number to
        //   link conversions on the data values.
        //
        // Since this affects the format of the output, it could be argued that
        // this should be implemented as a separate Accept MIME type. However,
        // that would require separate variants for each type of AJAX request
        // (e.g., drupal-ajax, drupal-dialog, drupal-modal), so for expediency,
        // this browser workaround is implemented via a GET or POST parameter.
        //
        // @see http://malsup.com/jquery/form/#file-upload
        // @see https://www.drupal.org/node/1009382
        // @see https://www.drupal.org/node/2339491
        // @see Drupal.ajax.prototype.beforeSend()
        $accept = $event->getRequest()->headers
            ->get('accept');
        if (strpos($accept, 'text/html') !== FALSE) {
            $response->headers
                ->set('Content-Type', 'text/html; charset=utf-8');
            // Browser IFRAMEs expect HTML. Browser extensions, such as Linkification
            // and Skype's Browser Highlighter, convert URLs, phone numbers, etc.
            // into links. This corrupts the JSON response. Protect the integrity of
            // the JSON data by making it the value of a textarea.
            // @see http://malsup.com/jquery/form/#file-upload
            // @see https://www.drupal.org/node/1009382
            $response->setContent('<textarea>' . $response->getContent() . '</textarea>');
        }
        // User-uploaded files cannot set any response headers, so a custom header
        // is used to indicate to ajax.js that this response is safe. Note that
        // most Ajax requests bound using the Form API will be protected by having
        // the URL flagged as trusted in Drupal.settings, so this header is used
        // only for things like custom markup that gets Ajax behaviors attached.
        $response->headers
            ->set('X-Drupal-Ajax-Token', 1);
    }
}