Remove step and assert dependencies

lib/cartodb/controllers/named_maps.js

@@ -1,5 +1,3 @@
-var step = require('step');
-var assert = require('assert');
 var _ = require('underscore');
 var NamedMapsCacheEntry = require('../cache/model/named_maps_entry');
 
@@ -151,8 +149,6 @@ function numMapper(n) {
 
 NamedMapsController.prototype.getStaticImageOptions = function () {
     return function getStaticImageOptionsMiddleware(req, res, next) {
-        var self = this;
-
         const { user, namedMapProvider, zoom, lon, lat, bbox } = res.locals;
 
         if ([zoom, lon, lat].map(numMapper).every(Number.isFinite)) {
@@ -183,12 +179,10 @@ NamedMapsController.prototype.getStaticImageOptions = function () {
             }
         }
 
-        step(
+        namedMapProvider.getTemplate((err, template) => {
-            function getTemplate() {
+            if (err) {
-                namedMapProvider.getTemplate(this);
+                return next(err);
-            },
+            }
-            function handleTemplateView(err, template) {
-                assert.ifError(err);
 
             if (template.view) {
                 var zoomCenter = templateZoomCenter(template.view);
@@ -196,45 +190,40 @@ NamedMapsController.prototype.getStaticImageOptions = function () {
                     if (Number.isFinite(+zoom)) {
                         zoomCenter.zoom = +zoom;
                     }
-                        return zoomCenter;
+                    res.locals.imageOpts = zoomCenter;
+                    return next();
                 }
 
                 var bounds = templateBounds(template.view);
                 if (bounds) {
-                        return bounds;
+                    res.locals.imageOpts = bounds;
+                    return next();
                 }
             }
 
-                return false;
+            res.locals.imageOpts = DEFAULT_ZOOM_CENTER;
-            },
-            function estimateBoundsIfNoImageOpts(err, imageOpts) {
-                if (imageOpts) {
-                    return imageOpts;
-                }
 
-                var _next = this;
+            namedMapProvider.getAffectedTablesAndLastUpdatedTime((err, affectedTablesAndLastUpdate) => {
-                namedMapProvider.getAffectedTablesAndLastUpdatedTime(function(err, affectedTablesAndLastUpdate) {
                 if (err) {
-                        return _next(null);
+                    return next();
                 }
 
                 var affectedTables = affectedTablesAndLastUpdate.tables || [];
 
                 if (affectedTables.length === 0) {
-                        return _next(null);
-                    }
-
-                    self.tablesExtentApi.getBounds(user, affectedTables, function (err, result) {
-                        return _next(null, result);
-                    });
-                });
-
-            },
-            function returnCallback(err, imageOpts) {
-                res.locals.imageOpts = imageOpts || DEFAULT_ZOOM_CENTER;
                     return next();
                 }
-        );
+
+                this.tablesExtentApi.getBounds(user, affectedTables, (err, bounds) => {
+                    if (err) {
+                        return next();
+                    }
+
+                    res.locals.imageOpts = bounds;
+                    return next();
+                });
+            });
+        });
     }.bind(this);
 };