change param name and comments updated

lib/cartodb/api/auth_api.js

@@ -19,22 +19,22 @@ function AuthApi(pgConnection, metadataBackend, mapStore, templateMaps) {
 
 module.exports = AuthApi;
 
-// Check if a request is authorized by a signer
+// Check if the user is authorized by a signer
 //
-// @param req express request object
+// @param res express response object
 // @param callback function(err, signed_by) signed_by will be
 //                 null if the request is not signed by anyone
 //                 or will be a string cartodb username otherwise.
 //
-AuthApi.prototype.authorizedBySigner = function(locals, callback) {
-    if ( ! locals.token || ! locals.signer ) {
+AuthApi.prototype.authorizedBySigner = function(params, callback) {
+    if ( ! params.token || ! params.signer ) {
         return callback(null, false); // no signer requested
     }
 
     var self = this;
 
-    var layergroup_id = locals.token;
-    var auth_token = locals.auth_token;
+    var layergroup_id = params.token;
+    var auth_token = params.auth_token;
 
     this.mapStore.load(layergroup_id, function(err, mapConfig) {
         if (err) {
@@ -84,6 +84,7 @@ AuthApi.prototype.authorizedByAPIKey = function(user, req, callback) {
  * Check access authorization
  *
  * @param req - standard req object. Importantly contains table and host information
+ * @param params res.locals parameters. Contains the auth parameters
  * @param callback function(err, allowed) is access allowed not?
  */
 AuthApi.prototype.authorize = function(req, params, callback) {