diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 51b260773..8b5af54af 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -11,6 +11,12 @@ class ApplicationController < ActionController::Base
       end
     end
 
+    def get_acter
+      return User.find params[:user_id] if params[:user_id]
+      return Group.find params[:group_id] if params[:group_id]
+      return current_user
+    end
+
     def authenticate_build_service!
       if request.remote_ip != APP_CONFIG['build_service_ip']
         render :nothing => true, :status => 403