Google Sign In Service

app_flutter/README.md

@@ -1,3 +1,9 @@
 # Build Dashboard v2 Frontend
 
-[Design Doc](https://flutter.dev/go/build-dashboard-v2)
+[Design Doc](https://flutter.dev/go/build-dashboard-v2)
+
+## Running for web locally
+
+`flutter run -d chrome --web-port=8080`
+
+Must run on port 8080 for Google Sign In to work since that is the only enabled port for localhost.

app_flutter/lib/build_dashboard.dart

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'package:app_flutter/service/google_authentication.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
@@ -52,6 +53,9 @@ class BuildDashboard extends StatelessWidget {
           backgroundColor: buildState.isTreeBuilding.data
               ? theme.primaryColor
               : theme.errorColor,
+          actions: <Widget>[
+            UserAvatar(buildState: buildState),
+          ],
         ),
         body: Column(
           children: const <Widget>[
@@ -62,3 +66,27 @@ class BuildDashboard extends StatelessWidget {
     );
   }
 }
+
+/// Widget for displaying sign in information for the current user.
+///
+/// If logged in, it will display the user's avatar. Otherwise, it will show
+/// a button for sign in.
+class UserAvatar extends StatelessWidget {
+  const UserAvatar({@required this.buildState, Key key}) : super(key: key);
+
+  final FlutterBuildState buildState;
+
+  @override
+  Widget build(BuildContext context) {
+    final GoogleSignInService authService = buildState.authService;
+
+    if (authService.isAuthenticated) {
+      return Image.network(authService.avatarUrl);
+    }
+
+    return FlatButton(
+      child: const Text('Sign in'),
+      onPressed: () => buildState.signIn(),
+    );
+  }
+}

app_flutter/lib/service/google_authentication.dart

@@ -0,0 +1,45 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:google_sign_in_all/google_sign_in_all.dart';
+
+/// Service class for interacting with Google Sign In authentication for Cocoon backend.
+class GoogleSignInService {
+  /// Creates a new [GoogleSignIn].
+  GoogleSignInService({GoogleSignIn googleSignIn})
+      : _googleSignIn = googleSignIn ??
+            setupGoogleSignIn(
+              scopes: <String>[
+                'https://www.googleapis.com/auth/userinfo.email',
+                'https://www.googleapis.com/auth/userinfo.profile',
+              ],
+              webClientId:
+                  '308150028417-vlj9mqlm3gk1d03fb0efif1fu5nagdtt.apps.googleusercontent.com',
+            );
+
+  // TODO(chillers): Switch to official Flutter plugin when it supports web.
+  final GoogleSignIn _googleSignIn;
+
+  AuthCredentials _credentials;
+
+  GoogleAccount _user;
+
+  /// Whether or not the application has been signed in to.
+  bool get isAuthenticated => _credentials?.accessToken != null;
+
+  /// The profile photo url of the current user signed in.
+  String get avatarUrl => _user?.photoUrl;
+
+  /// The email of the current user signed in.
+  String get email => _user?.email;
+
+  /// Authentication token to be sent to Cocoon Backend to verify API calls.
+  String get accessToken => _credentials?.accessToken;
+
+  /// Initiate the Google Sign In process.
+  Future<void> signIn() async {
+    _credentials = await _googleSignIn.signIn();
+    _user = await _googleSignIn.getCurrentUser();
+  }
+}

app_flutter/lib/state/flutter_build.dart

@@ -9,18 +9,25 @@ import 'package:flutter/foundation.dart';
 import 'package:cocoon_service/protos.dart' show CommitStatus;
 
 import '../service/cocoon.dart';
+import '../service/google_authentication.dart';
 
 /// State for the Flutter Build Dashboard
 class FlutterBuildState extends ChangeNotifier {
   /// Creates a new [FlutterBuildState].
   ///
   /// If [CocoonService] is not specified, a new [CocoonService] instance is created.
-  FlutterBuildState({CocoonService cocoonService})
-      : _cocoonService = cocoonService ?? CocoonService();
+  FlutterBuildState({
+    CocoonService cocoonService,
+    GoogleSignInService authService,
+  })  : authService = authService ?? GoogleSignInService(),
+        _cocoonService = cocoonService ?? CocoonService();
 
   /// Cocoon backend service that retrieves the data needed for this state.
   final CocoonService _cocoonService;
 
+  /// Authentication service for managing Google Sign In.
+  final GoogleSignInService authService;
+
   /// How often to query the Cocoon backend for the current build state.
   @visibleForTesting
   final Duration refreshRate = const Duration(seconds: 10);
@@ -69,6 +76,11 @@ class FlutterBuildState extends ChangeNotifier {
     notifyListeners();
   }
 
+  Future<void> signIn() async {
+    await authService.signIn();
+    notifyListeners();
+  }
+
   @override
   void dispose() {
     refreshTimer?.cancel();

app_flutter/pubspec.yaml

@@ -30,6 +30,7 @@ dependencies:
 
   cocoon_service:
     path: ../app_dart
+  google_sign_in_all: ^0.0.3
   provider: ^3.0.0
   url_launcher: ^5.1.0
   url_launcher_web:

app_flutter/test/build_dashboard_test.dart

@@ -0,0 +1,75 @@
+// Copyright (c) 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:mockito/mockito.dart';
+import 'package:test/test.dart' as test;
+
+import 'package:app_flutter/build_dashboard.dart';
+import 'package:app_flutter/service/google_authentication.dart';
+import 'package:app_flutter/service/fake_cocoon.dart';
+import 'package:app_flutter/state/flutter_build.dart';
+
+void main() {
+  group('UserAvatar', () {
+    GoogleSignInService authService;
+
+    setUp(() {
+      authService = MockGoogleSignInService();
+    });
+
+    testWidgets('shows sign in button when not signed in',
+        (WidgetTester tester) async {
+      when(authService.isAuthenticated).thenReturn(false);
+      final FlutterBuildState buildState = FlutterBuildState(
+          authService: authService, cocoonService: FakeCocoonService());
+      await tester.pumpWidget(MaterialApp(
+        home: UserAvatar(
+          buildState: buildState,
+        ),
+      ));
+
+      expect(find.text('Sign in'), findsOneWidget);
+    });
+
+    testWidgets('sign in button activates google sign in when pressed',
+        (WidgetTester tester) async {
+      when(authService.isAuthenticated).thenReturn(false);
+      final FlutterBuildState buildState = FlutterBuildState(
+          authService: authService, cocoonService: FakeCocoonService());
+      await tester.pumpWidget(MaterialApp(
+        home: UserAvatar(
+          buildState: buildState,
+        ),
+      ));
+
+      verifyNever(authService.signIn());
+
+      await tester.tap(find.byType(UserAvatar));
+
+      verify(authService.signIn()).called(1);
+    });
+
+    testWidgets('shows user avatar when signed in',
+        (WidgetTester tester) async {
+      when(authService.isAuthenticated).thenReturn(true);
+      when(authService.avatarUrl).thenReturn('https://flutter.dev');
+      final FlutterBuildState buildState = FlutterBuildState(
+          authService: authService, cocoonService: FakeCocoonService());
+      await tester.pumpWidget(MaterialApp(
+        home: UserAvatar(
+          buildState: buildState,
+        ),
+      ));
+
+      expect(tester.takeException(),
+          const test.TypeMatcher<NetworkImageLoadException>());
+      expect(find.byType(Image), findsOneWidget);
+    });
+  });
+}
+
+/// Mock [GoogleSignInService] for testing interactions.
+class MockGoogleSignInService extends Mock implements GoogleSignInService {}

app_flutter/test/service/google_authentication_test.dart

@@ -0,0 +1,86 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:google_sign_in_all/google_sign_in_all.dart';
+import 'package:mockito/mockito.dart';
+import 'package:test/test.dart';
+
+import 'package:app_flutter/service/google_authentication.dart';
+
+void main() {
+  group('GoogleSignInService not signed in', () {
+    GoogleSignInService authService;
+
+    setUp(() {
+      authService = GoogleSignInService(googleSignIn: MockGoogleSignIn());
+    });
+
+    test('not authenticated', () {
+      expect(authService.isAuthenticated, false);
+    });
+
+    test('no user information', () {
+      expect(authService.avatarUrl, null);
+      expect(authService.email, null);
+      expect(authService.accessToken, null);
+    });
+  });
+
+  group('GoogleSignInService sign in', () {
+    GoogleSignInService authService;
+    GoogleSignIn mockSignIn;
+
+    setUp(() {
+      mockSignIn = MockGoogleSignIn();
+      final AuthCredentials fakeCredentials = FakeAuthCredentials();
+      when(mockSignIn.signIn())
+          .thenAnswer((_) => Future<AuthCredentials>.value(fakeCredentials));
+      when(mockSignIn.getCurrentUser()).thenAnswer((_) =>
+          Future<GoogleAccount>.value(GoogleAccount(
+              email: 'fake@fake.com', photoUrl: 'fake://fake.png')));
+
+      authService = GoogleSignInService(googleSignIn: mockSignIn);
+    });
+
+    test('is authenticated after successful sign in', () async {
+      await authService.signIn();
+
+      expect(authService.isAuthenticated, true);
+    });
+
+    test('there is user information after successful sign in', () async {
+      await authService.signIn();
+
+      expect(authService.email, 'fake@fake.com');
+      expect(authService.avatarUrl, 'fake://fake.png');
+      expect(authService.accessToken, 'fake');
+    });
+
+    test('is not authenticated after failure in sign in', () async {
+      when(mockSignIn.signIn())
+          .thenAnswer((_) => Future<AuthCredentials>.value(null));
+      when(mockSignIn.getCurrentUser())
+          .thenAnswer((_) => Future<GoogleAccount>.value(null));
+
+      await authService.signIn();
+
+      expect(authService.isAuthenticated, false);
+      expect(authService.email, null);
+      expect(authService.avatarUrl, null);
+      expect(authService.accessToken, null);
+    });
+  });
+}
+
+/// Mock [GoogleSignIn] for testing interactions.
+class MockGoogleSignIn extends Mock implements GoogleSignIn {}
+
+/// Fake [AuthCredentials] for [MockGoogleSignIn].
+class FakeAuthCredentials implements AuthCredentials {
+  @override
+  final String accessToken = 'fake';
+
+  @override
+  final String idToken = 'faker';
+}