feat: Social Logins Implementation

lib/remote/repositories/auth_repository.dart

@@ -1,6 +1,7 @@
 import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 import 'package:logging/logging.dart';
 import 'package:mentorship_client/remote/api_manager.dart';
+import 'package:mentorship_client/remote/requests/google_signin.dart';
 import 'package:mentorship_client/remote/requests/login.dart';
 import 'package:mentorship_client/remote/requests/register.dart';
 import 'package:mentorship_client/remote/responses/auth_token.dart';
@@ -27,6 +28,11 @@ class AuthRepository {
     await ApiManager.callSafely(() => ApiManager.instance.authService.register(register));
   }
 
+  Future<AuthToken> googleSignIn(GoogleSignInModel googleSignIn) async {
+    final body = await ApiManager.callSafely(() => ApiManager.instance.authService.googleSignIn(googleSignIn));
+    return AuthToken.fromJson(body);
+  }
+
   Future<void> deleteToken() async {
     await _storage.delete(key: AUTH_TOKEN);
     Logger.root.info("Deleted token.");

lib/remote/requests/google_signin.dart

@@ -0,0 +1,15 @@
+import 'package:flutter/foundation.dart';
+
+/// This data class represents all data necessary to create a login
+class GoogleSignInModel {
+  final String name;
+  final String email;
+  final String idToken;
+
+  GoogleSignInModel({@required this.name, @required this.email,@required this.idToken})
+      : assert(name != null),
+        assert(email != null),
+        assert(idToken != null);
+
+  Map<String, String> toJson() => {'name': name, "email": email, "id_token": idToken};
+}

lib/remote/services/auth_service.dart

@@ -1,5 +1,6 @@
 import 'package:chopper/chopper.dart';
 import 'package:mentorship_client/constants.dart';
+import 'package:mentorship_client/remote/requests/google_signin.dart';
 import 'package:mentorship_client/remote/requests/login.dart';
 import 'package:mentorship_client/remote/requests/register.dart';
 
@@ -13,6 +14,9 @@ abstract class AuthService extends ChopperService {
   @Post(path: "register")
   Future<Response<Object>> register(@Body() Register register);
 
+  @Post(path: "google/auth/callback")
+  Future<Response<Map<String, dynamic>>> googleSignIn(@Body() GoogleSignInModel googleSignIn);
+
   static AuthService create() {
     final client = ChopperClient(
         baseUrl: API_URL,

lib/screens/login/bloc/login_bloc.dart

@@ -1,8 +1,10 @@
 import 'package:bloc/bloc.dart';
+import 'package:google_sign_in/google_sign_in.dart';
 import 'package:mentorship_client/auth/auth_bloc.dart';
 import 'package:mentorship_client/auth/bloc.dart';
 import 'package:mentorship_client/failure.dart';
 import 'package:mentorship_client/remote/repositories/auth_repository.dart';
+import 'package:mentorship_client/remote/requests/google_signin.dart';
 import 'package:mentorship_client/screens/login/bloc/login_event.dart';
 import 'package:mentorship_client/screens/login/bloc/login_state.dart';
 
@@ -24,5 +26,26 @@ class LoginBloc extends Bloc<LoginEvent, LoginState> {
         yield LoginFailure(failure.message);
       }
     }
+    else if (event is GoogleSignInButtonPressed){
+      yield LoginInProgress();
+      try{
+        GoogleSignIn googleSignIn = GoogleSignIn(scopes: [
+          'email'
+        ],);
+        GoogleSignInAccount googleSignInAccount = await googleSignIn.signIn();
+        GoogleSignInAuthentication authentication = await googleSignInAccount.authentication;
+        print(authentication.idToken);
+        final authToken = await authRepository.googleSignIn(GoogleSignInModel(name: googleSignInAccount.displayName, email: googleSignInAccount.email, idToken: authentication.idToken));
+        yield LoginSuccess();
+        authBloc.add(JustLoggedIn(authToken.token));
+
+      } on Failure catch (failure){
+        yield LoginFailure(failure.message);
+      }
+
+    }
+    else if (event is GoogleSignInFailed){
+      yield LoginFailure(event.message);
+    }
   }
 }

lib/screens/login/bloc/login_event.dart

@@ -13,3 +13,21 @@ class LoginButtonPressed extends LoginEvent {
   @override
   List<Object> get props => [login];
 }
+
+class GoogleSignInButtonPressed extends LoginEvent{
+
+
+  const GoogleSignInButtonPressed();
+
+  @override
+  List<Object> get props => [];
+}
+
+class GoogleSignInFailed extends LoginEvent{
+  final String message;
+
+  const GoogleSignInFailed(this.message);
+
+  @override
+  List<Object> get props => [message];
+}

lib/screens/login/login_screen.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:flutter_signin_button/flutter_signin_button.dart';
 import 'package:mentorship_client/auth/auth_bloc.dart';
 import 'package:mentorship_client/extensions/context.dart';
 import 'package:mentorship_client/remote/repositories/auth_repository.dart';
@@ -43,6 +44,13 @@ class _LoginFormState extends State<LoginForm> {
   final _passwordController = TextEditingController();
   final _formKey = GlobalKey<FormState>();
 
+
+  Future<void> _onGoogleSignInButtonPressed() async {
+    BlocProvider.of<LoginBloc>(context).add(
+         GoogleSignInButtonPressed()
+      );
+  }
+
   void _onLoginButtonPressed() {
     if (!_formKey.currentState.validate()) return;
 
@@ -132,7 +140,12 @@ class _LoginFormState extends State<LoginForm> {
                   onPressed: () => Navigator.push(
                       context, MaterialPageRoute(builder: (context) => RegisterScreen())),
                 ),
-              )
+              ),
+              SignInButton(
+                Buttons.Google,
+                onPressed:  _onGoogleSignInButtonPressed,
+                elevation: 5,
+              ),
             ],
           ),
         );

pubspec.yaml

@@ -37,6 +37,8 @@ dependencies:
   bloc: ^6.0.1
   flutter_bloc: ^6.0.1
   chopper: ^3.0.3
+  google_sign_in: ^4.5.9
+  flutter_signin_button: ^1.1.0
 
 
 # plugins not needed in app