Aviary: Check if the app has access to the High resolution feature

gistfile1.js

var featherEditorHiRes = -1;

var featherEditor = new Aviary.Feather({
...
  onReady: function(){
      if(featherEditorHiRes == -1){
          AV.controlsWidgetInstance.serverMessaging.sendMessage({
              id: "avpw_auth_form",
              action: AV.controlsWidgetInstance.assetManager.getManifestURL(),
              method: "GET",
              dataType: "json",
              announcer: AV.build.asyncFeatherTargetAnnounce,
              origin: AV.build.asyncImgrecvBase,
              callback: function(response){
                  featherEditorHiRes = false;
                  for(var i = 0; i < response.permissions.length; i++){
                      if(response.permissions[i] == "hires"){
                          featherEditorHiRes = true;
                          break;
                      }
                  }
              }
          });
      }
  },
  onSaveButtonClicked: function(){
      if(featherEditorHiRes === true){
          featherEditor.saveHiRes();
          return false;
      }
      // else leave the processing to the normal Aviary save...
  }
  ...
}