Version 1

[yaffs-website] / web / core / lib / Drupal / Core / EventSubscriber / AjaxResponseSubscriber.php

diff --git a/web/core/lib/Drupal/Core/EventSubscriber/AjaxResponseSubscriber.php b/web/core/lib/Drupal/Core/EventSubscriber/AjaxResponseSubscriber.php
new file mode 100644 (file)
index 0000000..701c433
--- /dev/null
+++ b/web/core/lib/Drupal/Core/EventSubscriber/AjaxResponseSubscriber.php
@@ -0,0 +1,119 @@
+<?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;
+  }
+
+}