Finish refactoring api

api.js

@@ -499,10 +499,19 @@ module.exports = function (Server) {
             return;
         }
 
-        var channels = Server.db.listUserChannels(name);
+        db.listUserChannels(name, function (err, res) {
+            if(err) {
+                res.jsonp({
+                    success: false,
+                    channels: []
+                });
+                return;
+            }
+
             res.jsonp({
                 success: true,
-            channels: channels
+                channels: res
+            });
         });
     });
 

utilities.js

@@ -1,6 +1,10 @@
 module.exports = {
     isValidChannelName: function (name) {
-        return name.match(/^[\w-_]+$/);
+        return name.match(/^[\w-_]{1,30}$/);
+    },
+
+    isValidUserName: function (name) {
+        return name.match(/^[\w-_]{1,20}$/);
     },
 
     randomSalt: function (length) {