Move sendResponse method to a middleware

lib/cartodb/controllers/analyses.js

@@ -18,24 +18,26 @@ AnalysesController.prototype.register = function(app) {
         cors(),
         userMiddleware,
         this.prepareContext,
-        this.catalog.bind(this)
+        this.catalog.bind(this),
+        this.sendResponse()
     );
 };
 
-AnalysesController.prototype.sendResponse = function(req, res, body) {
-    res.set('Cache-Control', 'public,max-age=10,must-revalidate');
+AnalysesController.prototype.sendResponse = function() {
+    return function sendResponseMiddleware (req, res) {
+        res.set('Cache-Control', 'public,max-age=10,must-revalidate');
 
-    res.status(200);
+        res.status(200);
 
-    if (req.query && req.query.callback) {
-        res.jsonp(body);
-    } else {
-        res.json(body);
-    }
+        if (req.query && req.query.callback) {
+            res.jsonp(res.body);
+        } else {
+            res.json(res.body);
+        }
+    };
 };
 
 AnalysesController.prototype.catalog = function (req, res, next) {
-    var self = this;
     var username = res.locals.user;
 
     step(
@@ -77,7 +79,7 @@ AnalysesController.prototype.catalog = function (req, res, next) {
                 return -1;
             });
         },
-        function sendResponse(err, catalogWithTables) {
+        function prepareResponse(err, catalogWithTables) {
             if (err) {
                 if (err.message.match(/permission\sdenied/)) {
                     err = new Error('Unauthorized');
@@ -86,7 +88,8 @@ AnalysesController.prototype.catalog = function (req, res, next) {
 
                 next(err);
             } else {
-                self.sendResponse(req, res, { catalog: catalogWithTables });
+                res.body = { catalog: catalogWithTables };
+                next();
             }
         }
     );