Use socket io v4

settings.json.docker

@@ -535,7 +535,7 @@
   /*
    * Restrict socket.io transport methods
    */
-  "socketTransportProtocols" : ["xhr-polling", "jsonp-polling", "htmlfile"],
+  "socketTransportProtocols" : ["polling", "websocket"],
 
   "socketIo": {
     /*

settings.json.template

@@ -535,7 +535,7 @@
   /*
    * Restrict socket.io transport methods
    */
-  "socketTransportProtocols" : ["xhr-polling", "jsonp-polling", "htmlfile"],
+  "socketTransportProtocols" : ["polling", "websocket"],
 
   "socketIo": {
     /*

src/node/hooks/express/socketio.js

@@ -51,8 +51,8 @@ exports.expressCreateServer = (hookName, args, cb) => {
   // there shouldn't be a browser that isn't compatible to all
   // transports in this list at once
   // e.g. XHR is disabled in IE by default, so in IE it should use jsonp-polling
-  io = socketio({
-    transports: settings.socketTransportProtocols,
+  io = new socketio.Server({
+    transports: settings.socketTransportProtocols
   }).listen(args.server, {
     /*
      * Do not set the "io" cookie.
@@ -106,14 +106,14 @@ exports.expressCreateServer = (hookName, args, cb) => {
   });
 
   io.use((socket, next) => {
-    socket.conn.on('packet', (packet) => {
+    socket.conn.on('package', (packet) => {
       // Tell express-session that the session is still active. The session store can use these
       // touch events to defer automatic session cleanup, and if express-session is configured with
       // rolling=true the cookie's expiration time will be renewed. (Note that WebSockets does not
       // have a standard mechanism for periodically updating the browser's cookies, so the browser
       // will not see the new cookie expiration time unless it makes a new HTTP request or the new
       // cookie value is sent to the client in a custom socket.io message.)
-      if (socket.request.session != null) socket.request.session.touch();
+      if (packet.request.session != null) packet.request.session.touch();
     });
     next();
   });

src/node/utils/Settings.js

@@ -121,7 +121,7 @@ exports.ssl = false;
 /**
  * socket.io transport methods
  **/
-exports.socketTransportProtocols = ['xhr-polling', 'jsonp-polling', 'htmlfile'];
+exports.socketTransportProtocols = ["polling", "websocket"];
 
 exports.socketIo = {
   /**

src/static/js/socketio.js

@@ -19,7 +19,7 @@ const connect = (etherpadBaseUrl, namespace = '/', options = {}) => {
   const baseUrl = new URL(etherpadBaseUrl, window.location);
   const socketioUrl = new URL('socket.io', baseUrl);
   const namespaceUrl = new URL(namespace, new URL('/', baseUrl));
-  return io(namespaceUrl.href, Object.assign({path: socketioUrl.pathname}, options));
+  return new io.Socket(namespaceUrl.href, Object.assign({path: socketioUrl.pathname}, options));
 };
 
 if (typeof exports === 'object') {

src/tests/backend/common.js

@@ -148,7 +148,7 @@ exports.connect = async (res = null) => {
   if (res) {
     padId = res.req.path.split('/p/')[1];
   }
-  const socket = io(`${exports.baseUrl}/`, {
+  const socket = new io.Socket(`${exports.baseUrl}/`, {
     forceNew: true, // Different tests will have different query parameters.
     path: '/socket.io',
     // socketio.js-client on node.js doesn't support cookies (see https://git.io/JU8u9), so the