feat(authentication): add google sign_in support (closes #59)

packages/wyatt_authentication_bloc/lib/src/data/data_sources/remote/authentication_firebase_data_source_impl.dart

@@ -14,7 +14,6 @@
 // You should have received a copy of the GNU General Public License
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
-import 'package:firebase_auth/firebase_auth.dart';
 import 'package:wyatt_authentication_bloc/wyatt_authentication_bloc.dart';
 import 'package:wyatt_type_utils/wyatt_type_utils.dart';
 
@@ -182,6 +181,39 @@ class AuthenticationFirebaseDataSourceImpl
     }
   }
 
+  @override
+  Future<Account> signInWithGoogle() async {
+    try {
+      // Trigger the authentication flow
+      final GoogleSignInAccount? googleUser = await GoogleSignIn().signIn();
+
+      // Obtain the auth details from the request
+      final GoogleSignInAuthentication? googleAuth =
+          await googleUser?.authentication;
+
+      // Create a new credential
+      final credential = GoogleAuthProvider.credential(
+        accessToken: googleAuth?.accessToken,
+        idToken: googleAuth?.idToken,
+      );
+
+      final userCredential =
+          await _firebaseAuth.signInWithCredential(credential);
+
+      _latestCreds = userCredential;
+      final user = userCredential.user;
+      if (user.isNotNull) {
+        return _mapper(user!);
+      } else {
+        throw Exception(); // Get caught just after.
+      }
+    } on FirebaseAuthException catch (e) {
+      throw SignInWithGoogleFailureFirebase.fromCode(e.code);
+    } catch (_) {
+      throw SignInWithGoogleFailureFirebase();
+    }
+  }
+
   @override
   Future<bool> verifyPasswordResetCode({required String code}) async {
     try {

packages/wyatt_authentication_bloc/lib/src/data/data_sources/remote/authentication_mock_data_source_impl.dart

@@ -123,6 +123,25 @@ class AuthenticationMockDataSourceImpl extends AuthenticationRemoteDataSource {
     return Future.value(mock);
   }
 
+  @override
+  Future<Account> signInWithGoogle() async {
+    await _randomDelay();
+    final creation = DateTime.now();
+    final mock = AccountModel(
+      uid: 'mock-id-google',
+      emailVerified: true,
+      isAnonymous: false,
+      providerId: 'google',
+      creationTime: creation,
+      lastSignInTime: creation,
+      isNewUser: creation == creation,
+    );
+    _streamAccount.add(mock);
+    _connectedMock = _connectedMock?.copyWith(left: mock);
+    _lastSignInTime = DateTime.now();
+    return Future.value(mock);
+  }
+
   @override
   Future<Account> signInWithEmailAndPassword({
     required String email,

packages/wyatt_authentication_bloc/lib/src/data/repositories/authentication_repository_impl.dart

@@ -295,6 +295,17 @@ class AuthenticationRepositoryImpl<T extends Object>
         (error) => error,
       );
 
+  @override
+  FutureOrResult<Account> signInWithGoogle() =>
+      Result.tryCatchAsync<Account, AppException, AppException>(
+        () async {
+          final account =
+              await _authenticationRemoteDataSource.signInWithGoogle();
+          return account;
+        },
+        (error) => error,
+      );
+
   @override
   FutureOrResult<bool> verifyPasswordResetCode({required String code}) =>
       Result.tryCatchAsync<bool, AppException, AppException>(

packages/wyatt_authentication_bloc/lib/src/domain/data_sources/remote/authentication_remote_data_source.dart

@@ -49,6 +49,8 @@ abstract class AuthenticationRemoteDataSource extends BaseRemoteDataSource {
 
   Future<Account> signInAnonymously();
 
+  Future<Account> signInWithGoogle();
+
   Future<Account> updateEmail({required String email});
 
   Future<Account> updatePassword({required String password});

packages/wyatt_authentication_bloc/lib/src/domain/repositories/authentication_repository.dart

@@ -73,6 +73,13 @@ abstract class AuthenticationRepository<T> extends BaseRepository {
   /// {@endtemplate}
   FutureOrResult<Account> signInAnonymously();
 
+  /// {@template signin_google}
+  /// Starts the Sign In with Google Flow.
+  ///
+  /// Throws a SignInWithGoogleFailureInterface if an exception occurs.
+  /// {@endtemplate}
+  FutureOrResult<Account> signInWithGoogle();
+
   /// {@template signin_pwd}
   /// Signs in with the provided [email] and [password].
   ///