Added private permission and clean up codes, solved potential race condition in realtime.js

lib/ot/editor-socketio-server.js

@@ -43,6 +43,7 @@ EditorSocketIOServer.prototype.addClient = function (socket) {
     socket.on('operation', function (revision, operation, selection) {
         operation = LZString.decompressFromUTF16(operation);
         operation = JSON.parse(operation);
+        socket.origin = 'operation';
         self.mayWrite(socket, function (mayWrite) {
             if (!mayWrite) {
                 console.log("User doesn't have the right to edit.");
@@ -59,6 +60,7 @@ EditorSocketIOServer.prototype.addClient = function (socket) {
         self.onGetOperations(socket, base, head);
     });
     socket.on('selection', function (obj) {
+        socket.origin = 'selection';
         self.mayWrite(socket, function (mayWrite) {
             if (!mayWrite) {
                 console.log("User doesn't have the right to edit.");
@@ -104,6 +106,7 @@ EditorSocketIOServer.prototype.onOperation = function (socket, revision, operati
             'operation', clientId, revision,
             wrappedPrime.wrapped.toJSON(), wrappedPrime.meta
         );
+        //set document is dirty
         this.isDirty = true;
     } catch (exc) {
         logger.error(exc);