make turn service optional

part of #810

dashboard/src/views/app.js

@@ -585,6 +585,36 @@ angular.module('Application').controller('AppController', ['$scope', '$location'
         },
     };
 
+    $scope.services = {
+        error: {},
+
+        busy: false,
+        enableTurn: '1', // curse of radio buttons
+
+        show: function () {
+            var app = $scope.app;
+
+            $scope.services.error = {};
+            $scope.services.enableTurn = app.enableTurn ? '1' : '0';
+        },
+
+        submitTurn: function () {
+            $scope.services.busy = true;
+            $scope.services.error = {};
+
+            Client.configureApp($scope.app.id, 'turn', { enable: $scope.services.enableTurn === '1' }, function (error) {
+                if (error && error.statusCode === 400) {
+                    $scope.services.busy = false;
+                    $scope.services.error.turn = true;
+                    return;
+                }
+                if (error) return Client.error(error);
+
+                $timeout(function () { $scope.services.busy = false; }, 1000);
+            });
+        },
+    };
+
     $scope.storage = {
         error: {},