Fix nudging for students (100%)

src/entry/app.js

@@ -17,6 +17,7 @@ import {
     inappPaintEditorGuide,
     inappPrivacyPolicy,
 } from "./inapp";
+import setupRealtime from './setupRealtime';
 
 /* This function replicates the behavior of the `.on<event>` properties but is
  * implemented using `addEventListener` and `removeEventListener`. This allows
@@ -205,4 +206,6 @@ window.onload = async () => {
         // Initialize currentUsage data
         InitialOptions.initWithSettings(window.Settings.initialOptions);
     });
+
+    setupRealtime();
 };

src/entry/setupRealtime.js

@@ -0,0 +1,36 @@
+/**
+ * This is used to get nudging/focus to work for students in Scratch JR.
+ */
+
+import { getDatabase } from 'firebase/database';
+import { initializeApp } from 'firebase/app';
+import { ref } from 'firebase/database';
+import { onChildChanged } from 'firebase/database';
+
+function getFirebaseRef ( userID ) {
+    // Returns reference to a node on Realtime Database"
+    var isLocal = window.isLocal;
+
+    var FIREBASE_URL = 'https://live-dashboard-d4d0e-default-rtdb.firebaseio.com/';
+    var refPath = isLocal ? 'LOCAL_NAV/' : 'LIVE_NAV/';
+    refPath += userID;
+    var firebaseApp = initializeApp({
+        databaseURL: FIREBASE_URL
+    });
+
+    const db = getDatabase(firebaseApp);
+    var nodeRef = ref(db, refPath);
+    return nodeRef;
+}
+
+function navigateToUrl (snapshot) {
+    var url = snapshot.val();
+    if (url && window.location.pathname != url) {
+        window.location.href = url;
+    }
+}
+
+export default function setupRealtime () {
+    var nodeRef = getFirebaseRef(window.userData.id);
+    onChildChanged(nodeRef, navigateToUrl);
+}