Make a middleware to respond layergroup

lib/cartodb/controllers/map.js

@@ -60,6 +60,7 @@ MapController.prototype.register = function(app) {
         this.prepareAdapterMapConfig.bind(this),
         this.createLayergroup.bind(this),
         this.createGet.bind(this),
+        respond,
         mapErrorMiddleware({
             label: 'ANONYMOUS LAYERGROUP',
             augmentError: true
@@ -74,6 +75,7 @@ MapController.prototype.register = function(app) {
         this.prepareAdapterMapConfig.bind(this),
         this.createLayergroup.bind(this),
         this.createPost.bind(this),
+        respond,
         mapErrorMiddleware({
             label: 'ANONYMOUS LAYERGROUP',
             augmentError: true
@@ -88,6 +90,7 @@ MapController.prototype.register = function(app) {
         this.getTemplate.bind(this),
         this.createLayergroupFromTemplate.bind(this),
         this.jsonp.bind(this),
+        respond,
         mapErrorMiddleware({
             label: 'NAMED MAP LAYERGROUP'
         })
@@ -101,6 +104,7 @@ MapController.prototype.register = function(app) {
         this.getTemplate.bind(this),
         this.createLayergroupFromTemplate.bind(this),
         this.instantiate.bind(this),
+        respond,
         mapErrorMiddleware({
             label: 'NAMED MAP LAYERGROUP'
         })
@@ -250,16 +254,7 @@ MapController.prototype.create = function(req, res, next) {
             if (err) {
                 return next(err);
             }
-
+            next();
-            const { layergroup } = res.locals;
-
-            res.status(200);
-
-            if (req.query && req.query.callback) {
-                res.jsonp(layergroup);
-            } else {
-                res.json(layergroup);
-            }
         }
     );
 };
@@ -333,20 +328,23 @@ MapController.prototype.instantiateTemplate = function(req, res, next) {
             if (err) {
                 return next(err);
             }
-
+            next();
-            const { layergroup } = res.locals;
-
-            res.status(200);
-
-            if (req.query && req.query.callback) {
-                res.jsonp(layergroup);
-            } else {
-                res.json(layergroup);
-            }
         }
     );
 };
 
+function respond (req, res) {
+    const { layergroup } = res.locals;
+
+    res.status(200);
+
+    if (req.query && req.query.callback) {
+        res.jsonp(layergroup);
+    } else {
+        res.json(layergroup);
+    }
+}
+
 MapController.prototype.afterLayergroupCreateBuilder = function (options = {}) {
     const self = this;
     const {