[ToB] [Frontend] Authentication, unit progress, complete unit, SDK selection

build.gradle.kts

@@ -164,6 +164,7 @@ tasks.rat {
     "learning/tour-of-beam/frontend/**/*.gen.dart",
     "learning/tour-of-beam/frontend/.metadata",
     "learning/tour-of-beam/frontend/pubspec.lock",
+    "learning/tour-of-beam/frontend/lib/firebase_options.dart",
 
     // Ignore .gitkeep file
     "**/.gitkeep",

learning/tour-of-beam/frontend/lib/auth/method.dart

@@ -0,0 +1,27 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import 'package:enum_map/enum_map.dart';
+
+part 'method.g.dart';
+
+@unmodifiableEnumMap
+enum AuthMethod {
+  google,
+  github,
+}

learning/tour-of-beam/frontend/lib/auth/notifier.dart

@@ -0,0 +1,50 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import 'dart:async';
+
+import 'package:firebase_auth/firebase_auth.dart';
+import 'package:flutter/material.dart';
+import 'method.dart';
+
+class AuthNotifier extends ChangeNotifier {
+  final _authProviders = UnmodifiableAuthMethodMap(
+    google: GoogleAuthProvider(),
+    github: GithubAuthProvider(),
+  );
+
+  AuthNotifier() {
+    FirebaseAuth.instance.authStateChanges().listen((user) {
+      notifyListeners();
+    });
+  }
+
+  bool get isAuthenticated => FirebaseAuth.instance.currentUser != null;
+
+  Future<String?> getToken() async {
+    return await FirebaseAuth.instance.currentUser?.getIdToken();
+  }
+
+  Future<void> logIn(AuthMethod authMethod) async {
+    await FirebaseAuth.instance.signInWithPopup(_authProviders.get(authMethod));
+  }
+
+  Future<void> logOut() async {
+    await FirebaseAuth.instance.signOut();
+  }
+}

learning/tour-of-beam/frontend/lib/cache/cache.dart

@@ -0,0 +1,27 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import 'package:flutter/material.dart';
+
+import '../repositories/client/client.dart';
+
+abstract class Cache extends ChangeNotifier {
+  final TobClient client;
+
+  Cache({required this.client});
+}

learning/tour-of-beam/frontend/lib/cache/content_tree.dart

@@ -18,21 +18,17 @@
 
 import 'dart:async';
 
-import 'package:flutter/widgets.dart';
-
 import '../models/content_tree.dart';
-import '../repositories/client/client.dart';
+import 'cache.dart';
 
-class ContentTreeCache extends ChangeNotifier {
-  final TobClient client;
+class ContentTreeCache extends Cache {
+  ContentTreeCache({
+    required super.client,
+  });
 
   final _treesBySdkId = <String, ContentTreeModel>{};
   final _futuresBySdkId = <String, Future<ContentTreeModel>>{};
 
-  ContentTreeCache({
-    required this.client,
-  });
-
   ContentTreeModel? getContentTree(String sdkId) {
     final future = _futuresBySdkId[sdkId];
     if (future == null) {

learning/tour-of-beam/frontend/lib/cache/sdk.dart

@@ -18,22 +18,19 @@
 
 import 'dart:async';
 
-import 'package:flutter/widgets.dart';
 import 'package:playground_components/playground_components.dart';
 
-import '../repositories/client/client.dart';
 import '../repositories/models/get_sdks_response.dart';
+import 'cache.dart';
 
-class SdkCache extends ChangeNotifier {
-  final TobClient client;
+class SdkCache extends Cache {
+  SdkCache({
+    required super.client,
+  });
 
   final _sdks = <Sdk>[];
   Future<GetSdksResponse>? _future;
 
-  SdkCache({
-    required this.client,
-  });
-
   List<Sdk> getSdks() {
     if (_future == null) {
       unawaited(_loadSdks());

learning/tour-of-beam/frontend/lib/cache/unit_content.dart

@@ -18,21 +18,17 @@
 
 import 'dart:async';
 
-import 'package:flutter/widgets.dart';
-
 import '../models/unit_content.dart';
-import '../repositories/client/client.dart';
+import 'cache.dart';
 
-class UnitContentCache extends ChangeNotifier {
-  final TobClient client;
+class UnitContentCache extends Cache {
+  UnitContentCache({
+    required super.client,
+  });
 
   final _unitContents = <String, Map<String, UnitContentModel>>{};
   final _futures = <String, Map<String, Future<UnitContentModel>>>{};
 
-  UnitContentCache({
-    required this.client,
-  });
-
   UnitContentModel? getUnitContent(String sdkId, String unitId) {
     final future = _futures[sdkId]?[unitId];
     if (future == null) {