authentication service wip

app_flutter/lib/service/authentication.dart

@@ -0,0 +1,37 @@
+// 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:flutter/foundation.dart' show kReleaseMode;
+
+/// Service class for interacting with authentication to Cocoon backend.
+/// 
+/// This service exists to have a universal location for all the authentication information.
+abstract class AuthenticationService {
+  /// Creates a new [AuthenticationService] based on if Flutter app is in production.
+  /// 
+  /// Production uses the Google Sign In service.
+  /// Otherwise, use fake data that mimicks being authenticated.
+  factory AuthenticationService() {
+    if (kReleaseMode) {
+
+    }
+
+    return null;
+  }
+
+  /// Whether or not the application has been logged in to.
+  bool get isAuthenticated => _isAuthenticated;
+  bool _isAuthenticated = false;
+
+  /// The email of the current user logged in.
+  String get email => _email;
+  String _email;
+
+  /// The avatar url of the current user logged in.
+  String get avatarUrl => _avatarUrl;
+  String _avatarUrl;
+
+  /// Initiate the [GoogleSignIn] process.
+  Future<bool> signIn();
+}

app_flutter/lib/service/google_authentication.dart

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+import 'package:app_flutter/service/authentication.dart';
+import 'package:google_sign_in_all/google_sign_in_all.dart';
+
+class GoogleAuthenticationService extends AuthenticationService {
+  GoogleAuthenticationService({GoogleSignIn googleSignIn})
+      : _googleSignIn = googleSignIn ??
+            setupGoogleSignIn(
+              scopes: <String>[
+                'https://www.googleapis.com/auth/userinfo.email',
+                'https://www.googleapis.com/auth/userinfo.profile',
+              ],
+              webClientId: 'github blocks me from putting you here :(',
+            ),
+        super();
+
+  GoogleSignIn _googleSignIn;
+
+  AuthCredentials credentials;
+
+  GoogleAccount user;
+
+  @override
+  Future<bool> signIn() {
+    return null;
+  }
+}