moving layergroup-token middleware to middlewarify style

test/acceptance/ported/support/ported_server_options.js

@@ -1,6 +1,7 @@
 var _ = require('underscore');
 var serverOptions = require('../../../../lib/cartodb/server_options');
 var mapnik = require('windshaft').mapnik;
+var LayergroupToken = require('../../../../lib/cartodb/models/layergroup-token');
 var OverviewsQueryRewriter = require('../../../../lib/cartodb/utils/overviews_query_rewriter');
 var overviewsQueryRewriter = new OverviewsQueryRewriter({
   zoom_level: 'CDB_ZoomFromScale(!scale_denominator!)'
@@ -56,11 +57,9 @@ module.exports = _.extend({}, serverOptions, {
         // this is in case you want to test sql parameters eg ...png?sql=select * from my_table limit 10
         req.params =  _.extend({}, req.params);
 
-        // We don't want to inherit Date.now() `cache_buster` as it is the default value
-        // introduced by the middleware when no cache buster is found.
-        // We are only interested in the `token` for the ported tests.
-        delete req.params.cache_buster;
-        delete req.params.signer;
+        if (req.params.token) {
+            req.params.token = LayergroupToken.parse(req.params.token).token;
+        }
 
         _.extend(req.params, req.query);
         req.params.user = 'localhost';