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- <?php
- namespace Drupal\Core\EventSubscriber;
- use Drupal\Component\Utility\Html;
- use Drupal\Core\Ajax\AjaxResponse;
- use Drupal\Core\Render\AttachmentsResponseProcessorInterface;
- use Symfony\Component\EventDispatcher\EventSubscriberInterface;
- use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
- use Symfony\Component\HttpKernel\Event\GetResponseEvent;
- use Symfony\Component\HttpKernel\KernelEvents;
- /**
- * Response subscriber to handle AJAX responses.
- */
- class AjaxResponseSubscriber implements EventSubscriberInterface {
- /**
- * The AJAX response attachments processor service.
- *
- * @var \Drupal\Core\Render\AttachmentsResponseProcessorInterface
- */
- protected $ajaxResponseAttachmentsProcessor;
- /**
- * Constructs an AjaxResponseSubscriber object.
- *
- * @param \Drupal\Core\Render\AttachmentsResponseProcessorInterface $ajax_response_attachments_processor
- * The AJAX response attachments processor service.
- */
- public function __construct(AttachmentsResponseProcessorInterface $ajax_response_attachments_processor) {
- $this->ajaxResponseAttachmentsProcessor = $ajax_response_attachments_processor;
- }
- /**
- * Request parameter to indicate that a request is a Drupal Ajax request.
- */
- const AJAX_REQUEST_PARAMETER = '_drupal_ajax';
- /**
- * Sets the AJAX parameter from the current request.
- *
- * @param \Symfony\Component\HttpKernel\Event\GetResponseEvent $event
- * The response event, which contains the current request.
- */
- public function onRequest(GetResponseEvent $event) {
- // Pass to the Html class that the current request is an Ajax request.
- if ($event->getRequest()->request->get(static::AJAX_REQUEST_PARAMETER)) {
- Html::setIsAjax(TRUE);
- }
- }
- /**
- * Renders the ajax commands right before preparing the result.
- *
- * @param \Symfony\Component\HttpKernel\Event\FilterResponseEvent $event
- * The response event, which contains the possible AjaxResponse object.
- */
- 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);
- }
- }
- /**
- * {@inheritdoc}
- */
- public static function getSubscribedEvents() {
- $events[KernelEvents::RESPONSE][] = ['onResponse', -100];
- $events[KernelEvents::REQUEST][] = ['onRequest', 50];
- return $events;
- }
- }
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