limiting user and group creation so that their slugs can't intersect.

src/groups.js

@@ -4,6 +4,7 @@
 	var async = require('async'),
 		winston = require('winston'),
 		user = require('./user'),
+		meta = require('./meta'),
 		db = require('./database'),
 		utils = require('../public/src/utils'),
 
@@ -182,7 +183,7 @@
 			var system = true;
 		}
 
-		Groups.exists(name, function (err, exists) {
+		meta.userOrGroupExists(name, function (err, exists) {
 			if (err) {
 				return callback(err);
 			}

src/meta.js

@@ -15,7 +15,8 @@ var fs = require('fs'),
 	translator = require('./../public/src/translator'),
 	db = require('./database'),
 	plugins = require('./plugins'),
-	user = require('./user');
+	user = require('./user'),
+	groups = require('./groups');
 
 (function (Meta) {
 	Meta.restartRequired = false;
@@ -521,6 +522,15 @@ var fs = require('fs'),
 	};
 
 	/* Assorted */
+	Meta.userOrGroupExists = function(slug, callback) {
+		async.parallel([
+			async.apply(user.exists, slug),
+			async.apply(groups.exists, slug)
+		], function(err, results) {
+			callback(err, results.some(function(result) { return result }));
+		});
+	};
+
 	Meta.restart = function() {
 		if (process.send) {
 			process.send({

src/socket.io/user.js

@@ -2,6 +2,7 @@
 
 var	async = require('async'),
 	user = require('../user'),
+	groups = require('../groups'),
 	topics = require('../topics'),
 	utils = require('./../../public/src/utils'),
 	meta = require('../meta'),
@@ -9,7 +10,7 @@ var	async = require('async'),
 
 SocketUser.exists = function(socket, data, callback) {
 	if (data && data.username) {
-		user.exists(utils.slugify(data.username), callback);
+		meta.userOrGroupExists(utils.slugify(data.username), callback);
 	}
 };
 

src/user/create.js

@@ -6,6 +6,7 @@ var async = require('async'),
 	validator = require('validator'),
 	plugins = require('../plugins'),
 	groups = require('../groups'),
+	meta = require('../meta'),
 	notifications = require('../notifications'),
 	translator = require('../../public/src/translator');
 
@@ -43,10 +44,11 @@ module.exports = function(User) {
 				}
 			},
 			function(next) {
-				User.exists(userData.userslug, function(err, exists) {
+				meta.userOrGroupExists(userData.userslug, function(err, exists) {
 					if (err) {
 						return next(err);
 					}
+
 					if (exists) {
 						async.forever(function(next) {
 							var	newUsername = userData.username + (Math.floor(Math.random() * 255) + 1);