/**
  * Handles requests to view a vidyard video in the cms
  * @param {SS_HTTPRequest} $request HTTP Request object
  * @return {string} Rendered view on success null on error
  * @throws SS_HTTPResponse_Exception
  */
 public function viewvidyard(SS_HTTPRequest $request)
 {
     $file = null;
     $url = null;
     if ($fileUrl = $request->getVar('VidyardURL')) {
         // If this isn't an absolute URL, or is, but is to this site, try and get the File object
         // that is associated with it
         if (Director::is_absolute_url($fileUrl) && !Director::is_site_url($fileUrl) && Vidyard::validateVidyardURL($fileUrl)) {
             list($file, $url) = $this->getVideoByURL($fileUrl);
         } else {
             throw new SS_HTTPResponse_Exception('"VidyardURL" is not a valid Vidyard Video', 400);
         }
     } else {
         throw new SS_HTTPResponse_Exception('Need "VidyardURL" parameter to identify the file', 400);
     }
     $fileWrapper = new VidyardInsertMedia_Embed($url, $file);
     $fields = $this->getFieldsForVidyard($url, $fileWrapper);
     return $fileWrapper->customise(array('Fields' => $fields))->renderWith('HtmlEditorField_viewfile');
 }