first part of messaging refactor

src/messaging/rooms.js

@@ -0,0 +1,46 @@
+'use strict';
+
+var async = require('async');
+
+var db = require('../database');
+
+module.exports = function(Messaging) {
+
+	Messaging.roomExists = function(roomId, callback) {
+		db.exists('chat:room:' + roomId + ':uids', callback);
+	};
+
+	Messaging.isRoomOwner = function(uid, roomId, callback) {
+		db.getSortedSetRange('chat:room:' + roomId + ':uids', 0, 0, function(err, uids) {
+			if (err) {
+				return callback(err);
+			}
+			if (!Array.isArray(uids) || !uids.length) {
+				return callback(null, false);
+			}
+			callback(null, parseInt(uids[0], 10) === parseInt(uid, 10));
+		});
+	};
+
+	Messaging.addUsersToRoom = function(fromuid, toUids, roomId, callback) {
+		async.waterfall([
+			function (next) {
+				Messaging.isRoomOwner(fromuid, roomId, next);
+			},
+			function (isOwner, next) {
+				if (!isOwner) {
+					return next(new Error('[[error:cant-add-users-to-chat-room]]'));
+				}
+				var now = Date.now();
+				var timestamps = toUids.map(function() {
+					return now;
+				});
+				db.sortedSetAdd('chat:room:' + roomId + ':uids', timestamps, toUids, next);
+			}
+		], callback);
+	};
+
+	Messaging.getUidsInRoom = function(roomId, start, stop, callback) {
+		db.getSortedSetRange('chat:room:' + roomId + ':uids', start, stop, callback);
+	};
+};