Fix websocket on old versions of IE11 (#4501)

webapp/actions/websocket_actions.jsx

@@ -30,34 +30,37 @@ import {browserHistory} from 'react-router/es6';
 const MAX_WEBSOCKET_FAILS = 7;
 
 export function initialize() {
-    if (window.WebSocket) {
+    if (!window.WebSocket) {
-        let connUrl = Utils.getSiteURL();
+        console.log('Browser does not support websocket'); //eslint-disable-line no-console
-
+        return;
-        // replace the protocol with a websocket one
-        if (connUrl.startsWith('https:')) {
-            connUrl = connUrl.replace(/^https:/, 'wss:');
-        } else {
-            connUrl = connUrl.replace(/^http:/, 'ws:');
-        }
-
-        // append a port number if one isn't already specified
-        if (!(/:\d+$/).test(connUrl)) {
-            if (connUrl.startsWith('wss:')) {
-                connUrl += ':' + global.window.mm_config.WebsocketSecurePort;
-            } else {
-                connUrl += ':' + global.window.mm_config.WebsocketPort;
-            }
-        }
-
-        // append the websocket api path
-        connUrl += Client.getUsersRoute() + '/websocket';
-
-        WebSocketClient.setEventCallback(handleEvent);
-        WebSocketClient.setFirstConnectCallback(handleFirstConnect);
-        WebSocketClient.setReconnectCallback(handleReconnect);
-        WebSocketClient.setCloseCallback(handleClose);
-        WebSocketClient.initialize(connUrl);
     }
+
+    let connUrl = Utils.getSiteURL();
+
+    // replace the protocol with a websocket one
+    if (connUrl.startsWith('https:')) {
+        connUrl = connUrl.replace(/^https:/, 'wss:');
+    } else {
+        connUrl = connUrl.replace(/^http:/, 'ws:');
+    }
+
+    // append a port number if one isn't already specified
+    if (!(/:\d+$/).test(connUrl)) {
+        if (connUrl.startsWith('wss:')) {
+            connUrl += ':' + global.window.mm_config.WebsocketSecurePort;
+        } else {
+            connUrl += ':' + global.window.mm_config.WebsocketPort;
+        }
+    }
+
+    // append the websocket api path
+    connUrl += Client.getUsersRoute() + '/websocket';
+
+    WebSocketClient.setEventCallback(handleEvent);
+    WebSocketClient.setFirstConnectCallback(handleFirstConnect);
+    WebSocketClient.setReconnectCallback(handleReconnect);
+    WebSocketClient.setCloseCallback(handleClose);
+    WebSocketClient.initialize(connUrl);
 }
 
 export function close() {

webapp/client/websocket_client.jsx

@@ -8,6 +8,7 @@ const MAX_WEBSOCKET_RETRY_TIME = 300000; // 5 mins
 export default class WebSocketClient {
     constructor() {
         this.conn = null;
+        this.connectionUrl = null;
         this.sequence = 1;
         this.connectFailCount = 0;
         this.eventCallback = null;
@@ -18,16 +19,22 @@ export default class WebSocketClient {
         this.closeCallback = null;
     }
 
-    initialize(connectionUrl, token) {
+    initialize(connectionUrl = this.connectionUrl, token) {
         if (this.conn) {
             return;
         }
 
+        if (connectionUrl == null) {
+            console.log('websocket must have connection url'); //eslint-disable-line no-console
+            return;
+        }
+
         if (this.connectFailCount === 0) {
             console.log('websocket connecting to ' + connectionUrl); //eslint-disable-line no-console
         }
 
         this.conn = new WebSocket(connectionUrl);
+        this.connectionUrl = connectionUrl;
 
         this.conn.onopen = () => {
             if (token) {
@@ -150,7 +157,7 @@ export default class WebSocketClient {
 
         if (this.conn && this.conn.readyState === WebSocket.OPEN) {
             this.conn.send(JSON.stringify(msg));
-        } else if (!this.conn || this.conn.readyState === WebSocket.Closed) {
+        } else if (!this.conn || this.conn.readyState === WebSocket.CLOSED) {
             this.conn = null;
             this.initialize();
         }

webapp/components/logged_in.jsx

@@ -105,7 +105,7 @@ export default class LoggedIn extends React.Component {
     }
 
     componentDidMount() {
-        // Initalize websocket
+        // Initialize websocket
         WebSocketActions.initialize();
 
         // Listen for user

webapp/utils/utils.jsx

@@ -1270,7 +1270,15 @@ export function isValidPassword(password) {
 }
 
 export function getSiteURL() {
-    return global.mm_config.SiteURL || window.location.origin;
+    if (global.mm_config.SiteURL) {
+        return global.mm_config.SiteURL;
+    }
+
+    if (window.location.origin) {
+        return window.location.origin;
+    }
+
+    return window.location.protocol + '//' + window.location.hostname + (window.location.port ? ':' + window.location.port : '');
 }
 
 export function handleFormattedTextClick(e) {