closes #4063

public/src/client/account/header.js

@@ -1,5 +1,5 @@
 'use strict';
-/* globals define, app, ajaxify, socket, RELATIVE_PATH */
+/* globals define, app, config, ajaxify, socket, bootbox, translator */
 
 define('forum/account/header', [
 	'coverPhoto',
@@ -30,7 +30,16 @@ define('forum/account/header', [
 		});
 
 		components.get('account/chat').on('click', function() {
-			app.newChat(theirid);
+			socket.emit('modules.chats.hasPrivateChat', theirid, function(err, roomId) {
+				if (err) {
+					return app.alertError(err.message);
+				}
+				if (roomId) {
+					app.openChat(roomId);
+				} else {
+					app.newChat(theirid);
+				}
+			});
 		});
 
 		components.get('account/ban').on('click', banAccount);
@@ -65,7 +74,7 @@ define('forum/account/header', [
 				}, callback);
 			},
 			function() {
-				uploader.open(RELATIVE_PATH + '/api/user/' + ajaxify.data.userslug + '/uploadcover', { uid: yourid }, 0, function(imageUrlOnServer) {
+				uploader.open(config.RELATIVE_PATH + '/api/user/' + ajaxify.data.userslug + '/uploadcover', { uid: yourid }, 0, function(imageUrlOnServer) {
 					components.get('account/cover').css('background-image', 'url(' + imageUrlOnServer + '?v=' + Date.now() + ')');
 				});
 			},

src/messaging.js

@@ -384,5 +384,44 @@ var async = require('async'),
 		], callback);
 	};
 
+	Messaging.hasPrivateChat = function(uid, withUid, callback) {
+		async.waterfall([
+			function (next) {
+				async.parallel({
+					myRooms: async.apply(db.getSortedSetRevRange, 'uid:' + uid + ':chat:rooms', 0, -1),
+					theirRooms: async.apply(db.getSortedSetRevRange, 'uid:' + withUid + ':chat:rooms', 0, -1)
+				}, next);
+			},
+			function (results, next) {
+				var roomIds = results.myRooms.filter(function(roomId) {
+					return roomId && results.theirRooms.indexOf(roomId) !== -1;
+				});
+
+				if (!roomIds.length) {
+					return callback();
+				}
+
+				var index = 0;
+				var roomId = 0;
+				async.whilst(function() {
+					return index < roomIds.length && !roomId;
+				}, function(next) {
+					Messaging.getUserCountInRoom(roomIds[index], function(err, count) {
+						if (err) {
+							return next(err);
+						}
+						if (count === 2) {
+							roomId = roomIds[index];
+							next(null, roomId);
+						} else {
+							++ index;
+							next();
+						}
+					});
+				}, next);
+			}
+		], callback);
+	};
+
 
 }(exports));

src/socket.io/modules.js

@@ -294,6 +294,12 @@ SocketModules.chats.getRecentChats = function(socket, data, callback) {
 	Messaging.getRecentChats(socket.uid, start, stop, callback);
 };
 
+SocketModules.chats.hasPrivateChat = function(socket, uid, callback) {
+	if (!socket.uid || !uid) {
+		return callback(null, new Error('[[error:invalid-data]]'));
+	}
+	Messaging.hasPrivateChat(socket.uid, uid, callback);
+};
 
 /* Sounds */
 SocketModules.sounds.getSounds = function(socket, data, callback) {