Disable websockets in shared boards (#1391)

* Disable websockets in shared boards

* Address review comments

* Fix linter

webapp/src/app.tsx

@@ -81,6 +81,13 @@ const App = React.memo((): JSX.Element => {
     const me = useAppSelector<IUser|null>(getMe)
     const dispatch = useAppDispatch()
 
+    // this is a temporary solution while we're using legacy routes
+    // for shared boards as a way to disable websockets, and should be
+    // removed when anonymous plugin routes are implemented. This
+    // check is used to detect if we're running inside the plugin but
+    // in a legacy route
+    const inPluginLegacy = window.location.pathname.includes('/plugins/focalboard/')
+
     useEffect(() => {
         dispatch(fetchLanguage())
         dispatch(fetchMe())
@@ -88,12 +95,14 @@ const App = React.memo((): JSX.Element => {
         history.replace(window.location.pathname.replace((window as any).frontendBaseURL, ''))
     }, [])
 
-    useEffect(() => {
+    if (!inPluginLegacy) {
-        wsClient.open()
+        useEffect(() => {
-        return () => {
+            wsClient.open()
-            wsClient.close()
+            return () => {
-        }
+                wsClient.close()
-    }, [])
+            }
+        }, [])
+    }
 
     useEffect(() => {
         if (me) {