1 files changed, 4 insertions, 1 deletions
diff --git a/lib/ot/editor-socketio-server.js b/lib/ot/editor-socketio-server.js
index 9e4ddf96..45ed5036 100755
--- a/lib/ot/editor-socketio-server.js
+++ b/lib/ot/editor-socketio-server.js
@@ -10,7 +10,7 @@ var util = require('util');
 var LZString = require('lz-string');
 var logger = require('../logger');
 
-function EditorSocketIOServer(document, operations, docId, mayWrite) {
+function EditorSocketIOServer(document, operations, docId, mayWrite, operationCallback) {
     EventEmitter.call(this);
     Server.call(this, document, operations);
     this.users = {};
@@ -18,6 +18,7 @@ function EditorSocketIOServer(document, operations, docId, mayWrite) {
     this.mayWrite = mayWrite || function (_, cb) {
         cb(true);
     };
+    this.operationCallback = operationCallback;
 }
 
 util.inherits(EditorSocketIOServer, Server);
@@ -51,6 +52,8 @@ EditorSocketIOServer.prototype.addClient = function (socket) {
             }
             try {
                 self.onOperation(socket, revision, operation, selection);
+                if (typeof self.operationCallback === 'function')
+                    self.operationCallback(socket, operation);
             } catch (err) {
 				socket.disconnect(true);
             }