Create authorizedByAPIKey middleware

lib/cartodb/controllers/named_maps_admin.js

@@ -198,6 +198,26 @@ NamedMapsAdminController.prototype.list = function(req, res, next) {
     );
 };
 
+NamedMapsAdminController.prototype.authorizedByAPIKey = function (action) {
+    return function authorizedByAPIKeyMiddleware (req, res, next) {
+        const { user } = res.locals;
+
+        this.authApi.authorizedByAPIKey(user, req, (err, authenticated) => {
+            if (err) {
+                return next(err);
+            }
+
+            if (!authenticated) {
+                const error = new Error(`Only authenticated user can ${action} templated maps`);
+                error.http_status = 403;
+                return next(error);
+            }
+
+            next();
+        });
+    }.bind(this);
+};
+
 function finishFn(controller, req, res, description, status, next) {
     return function finish(err, body){
         if (err) {