feat(auth): added Google Sign-In authentication

CHANGELOG.md

@@ -24,6 +24,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Added `DebugScreen` sign out action for quick manual verification.
 - Added auth-aware routing with GoRouter redirect (`/auth/*` is public, other routes require authentication).
 - Added localized authentication failure messages (ARB + `AuthFailure` → l10n mapper).
+- Added Google Sign-In authentication.
 
 ### Changed
 

ios/Podfile.lock

@@ -1188,6 +1188,16 @@ PODS:
     - abseil/meta/type_traits
     - abseil/xcprivacy
   - abseil/xcprivacy (1.20240722.0)
+  - AppAuth (2.0.0):
+    - AppAuth/Core (= 2.0.0)
+    - AppAuth/ExternalUserAgent (= 2.0.0)
+  - AppAuth/Core (2.0.0)
+  - AppAuth/ExternalUserAgent (2.0.0):
+    - AppAuth/Core
+  - AppCheckCore (11.2.0):
+    - GoogleUtilities/Environment (~> 8.0)
+    - GoogleUtilities/UserDefaults (~> 8.0)
+    - PromisesObjC (~> 2.4)
   - BoringSSL-GRPC (0.0.37):
     - BoringSSL-GRPC/Implementation (= 0.0.37)
     - BoringSSL-GRPC/Interface (= 0.0.37)
@@ -1323,6 +1333,11 @@ PODS:
     - GoogleUtilities/Environment (~> 8.1)
     - GTMSessionFetcher/Core (< 6.0, >= 3.4)
   - Flutter (1.0.0)
+  - google_sign_in_ios (0.0.1):
+    - Flutter
+    - FlutterMacOS
+    - GoogleSignIn (~> 9.0)
+    - GTMSessionFetcher (>= 3.4.0)
   - GoogleAdsOnDeviceConversion (3.2.0):
     - GoogleUtilities/Environment (~> 8.1)
     - GoogleUtilities/Logger (~> 8.1)
@@ -1353,6 +1368,11 @@ PODS:
   - GoogleDataTransport (10.1.0):
     - nanopb (~> 3.30910.0)
     - PromisesObjC (~> 2.4)
+  - GoogleSignIn (9.1.0):
+    - AppAuth (~> 2.0)
+    - AppCheckCore (~> 11.0)
+    - GTMAppAuth (~> 5.0)
+    - GTMSessionFetcher/Core (~> 3.3)
   - GoogleUtilities/AppDelegateSwizzler (8.1.0):
     - GoogleUtilities/Environment
     - GoogleUtilities/Logger
@@ -1472,7 +1492,14 @@ PODS:
     - gRPC-Core/Privacy (= 1.69.0)
   - gRPC-Core/Interface (1.69.0)
   - gRPC-Core/Privacy (1.69.0)
+  - GTMAppAuth (5.0.0):
+    - AppAuth/Core (~> 2.0)
+    - GTMSessionFetcher/Core (< 4.0, >= 3.3)
+  - GTMSessionFetcher (3.5.0):
+    - GTMSessionFetcher/Full (= 3.5.0)
   - GTMSessionFetcher/Core (3.5.0)
+  - GTMSessionFetcher/Full (3.5.0):
+    - GTMSessionFetcher/Core
   - leveldb-library (1.22.6)
   - nanopb (3.30910.0):
     - nanopb/decode (= 3.30910.0)
@@ -1502,13 +1529,16 @@ DEPENDENCIES:
   - firebase_crashlytics (from `.symlinks/plugins/firebase_crashlytics/ios`)
   - firebase_storage (from `.symlinks/plugins/firebase_storage/ios`)
   - Flutter (from `Flutter`)
+  - google_sign_in_ios (from `.symlinks/plugins/google_sign_in_ios/darwin`)
   - path_provider_foundation (from `.symlinks/plugins/path_provider_foundation/darwin`)
   - shared_preferences_foundation (from `.symlinks/plugins/shared_preferences_foundation/darwin`)
   - sqflite_darwin (from `.symlinks/plugins/sqflite_darwin/darwin`)
 
 SPEC REPOS:
   trunk:
     - abseil
+    - AppAuth
+    - AppCheckCore
     - BoringSSL-GRPC
     - Firebase
     - FirebaseAnalytics
@@ -1529,9 +1559,11 @@ SPEC REPOS:
     - GoogleAdsOnDeviceConversion
     - GoogleAppMeasurement
     - GoogleDataTransport
+    - GoogleSignIn
     - GoogleUtilities
     - "gRPC-C++"
     - gRPC-Core
+    - GTMAppAuth
     - GTMSessionFetcher
     - leveldb-library
     - nanopb
@@ -1556,6 +1588,8 @@ EXTERNAL SOURCES:
     :path: ".symlinks/plugins/firebase_storage/ios"
   Flutter:
     :path: Flutter
+  google_sign_in_ios:
+    :path: ".symlinks/plugins/google_sign_in_ios/darwin"
   path_provider_foundation:
     :path: ".symlinks/plugins/path_provider_foundation/darwin"
   shared_preferences_foundation:
@@ -1565,6 +1599,8 @@ EXTERNAL SOURCES:
 
 SPEC CHECKSUMS:
   abseil: a05cc83bf02079535e17169a73c5be5ba47f714b
+  AppAuth: 1c1a8afa7e12f2ec3a294d9882dfa5ab7d3cb063
+  AppCheckCore: cc8fd0a3a230ddd401f326489c99990b013f0c4f
   BoringSSL-GRPC: dded2a44897e45f28f08ae87a55ee4bcd19bc508
   cloud_firestore: 45532e0c1fd1f6a5720af8aa0312470c366b73d2
   connectivity_plus: cb623214f4e1f6ef8fe7403d580fdad517d2f7dd
@@ -1590,12 +1626,15 @@ SPEC CHECKSUMS:
   FirebaseSharedSwift: 79f27fff0addd15c3de19b87fba426f3cc2c964f
   FirebaseStorage: 550349b1e8f7315834ea08308696e9469d77135d
   Flutter: cabc95a1d2626b1b06e7179b784ebcf0c0cde467
+  google_sign_in_ios: 00dfa94252eb10278b64828c81bcb7158a81a53a
   GoogleAdsOnDeviceConversion: d68c69dd9581a0f5da02617b6f377e5be483970f
   GoogleAppMeasurement: 3bf40aff49a601af5da1c3345702fcb4991d35ee
   GoogleDataTransport: aae35b7ea0c09004c3797d53c8c41f66f219d6a7
+  GoogleSignIn: fcee2257188d5eda57a5e2b6a715550ffff9206d
   GoogleUtilities: 00c88b9a86066ef77f0da2fab05f65d7768ed8e1
   "gRPC-C++": cc207623316fb041a7a3e774c252cf68a058b9e8
   gRPC-Core: 860978b7db482de8b4f5e10677216309b5ff6330
+  GTMAppAuth: 217a876b249c3c585a54fd6f73e6b58c4f5c4238
   GTMSessionFetcher: 5aea5ba6bd522a239e236100971f10cb71b96ab6
   leveldb-library: cc8b8f8e013647a295ad3f8cd2ddf49a6f19be19
   nanopb: fad817b59e0457d11a5dfbde799381cd727c1275

ios/Runner.xcodeproj/project.pbxproj

@@ -201,6 +201,7 @@
 				9705A1C41CF9048500538489 /* Embed Frameworks */,
 				3B06AD1E1E4923F5004D2608 /* Thin Binary */,
 				3D0E01DF18316EDF773EAB0D /* [CP] Embed Pods Frameworks */,
+				5180CEFDE13AEFAE9BBD9627 /* [CP] Copy Pods Resources */,
 			);
 			buildRules = (
 			);
@@ -350,6 +351,23 @@
 			shellScript = "\"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-frameworks.sh\"\n";
 			showEnvVarsInLog = 0;
 		};
+		5180CEFDE13AEFAE9BBD9627 /* [CP] Copy Pods Resources */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputFileListPaths = (
+				"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-resources-${CONFIGURATION}-input-files.xcfilelist",
+			);
+			name = "[CP] Copy Pods Resources";
+			outputFileListPaths = (
+				"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-resources-${CONFIGURATION}-output-files.xcfilelist",
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "\"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-resources.sh\"\n";
+			showEnvVarsInLog = 0;
+		};
 		9740EEB61CF901F6004384FC /* Run Script */ = {
 			isa = PBXShellScriptBuildPhase;
 			alwaysOutOfDate = 1;

ios/Runner/Info.plist

@@ -2,6 +2,21 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
+	<key>GIDClientID</key>
+	<string>342615478088-590oga73rl6r8hoodfnfpfh6gj38kn2f.apps.googleusercontent.com</string>
+	<!-- Google Sign-in Section -->
+	<key>CFBundleURLTypes</key>
+	<array>
+		<dict>
+			<key>CFBundleTypeRole</key>
+			<string>Editor</string>
+			<key>CFBundleURLSchemes</key>
+			<array>
+				<string>com.googleusercontent.apps.342615478088-590oga73rl6r8hoodfnfpfh6gj38kn2f</string>
+			</array>
+		</dict>
+	</array>
+	<!-- End of the Google Sign-in Section -->
 	<key>CFBundleDevelopmentRegion</key>
 	<string>$(DEVELOPMENT_LANGUAGE)</string>
 	<key>CFBundleDisplayName</key>

lib/core/di/di.dart

@@ -3,6 +3,7 @@ import 'package:firebase_analytics/firebase_analytics.dart';
 import 'package:firebase_auth/firebase_auth.dart';
 import 'package:flutter/foundation.dart';
 import 'package:get_it/get_it.dart';
+import 'package:google_sign_in/google_sign_in.dart';
 import 'package:logger/logger.dart';
 
 import '../../features/auth/data/repositories/auth_repository_impl.dart';
@@ -21,7 +22,7 @@ import '../utils/logger/logger_setup.dart';
 final di = GetIt.instance;
 
 /// Initializes the application's dependencies using GetIt.
-void setupDI() {
+Future<void> setupDI() async {
   // Logger
   di.registerLazySingleton<Logger>(() => createLogger());
   di.registerLazySingleton<AppLogger>(() => AppLoggerImpl(di<Logger>()));
@@ -36,8 +37,18 @@ void setupDI() {
 
   // Authentication
   di.registerLazySingleton<FirebaseAuth>(() => FirebaseAuth.instance);
-  di.registerLazySingleton<AuthRepository>(
-    () => AuthRepositoryImpl(di<AppLogger>(), di<FirebaseAuth>()),
+  di.registerSingletonAsync<GoogleSignIn>(() async {
+    final googleSignIn = GoogleSignIn.instance;
+    await googleSignIn.initialize();
+    return googleSignIn;
+  });
+  di.registerSingletonWithDependencies<AuthRepository>(
+    () => AuthRepositoryImpl(
+      di<AppLogger>(),
+      di<FirebaseAuth>(),
+      di<GoogleSignIn>(),
+    ),
+    dependsOn: [GoogleSignIn],
   );
   di.registerLazySingleton(() => AuthBloc(di<AppAnalytics>(), di<AuthRepository>()));
 
@@ -47,4 +58,6 @@ void setupDI() {
     () => NetworkServiceImpl(di<Connectivity>()),
     dispose: (param) => param.dispose(),
   );
+
+  await di.allReady();
 }

lib/core/failures/feature/auth/auth_failure.dart

@@ -145,6 +145,78 @@ final class NetworkRequestFailedFailure extends AuthFailure {
   }) : super('');
 }
 
+/// Operation cancelled error.
+final class OperationCancelledFailure extends AuthFailure {
+  @override
+  String get code => 'canceled';
+
+  /// Creates an instance of [OperationCancelledFailure].
+  const OperationCancelledFailure({
+    super.stackTrace,
+    super.parentException,
+  }) : super('');
+}
+
+/// Operation interrupted error.
+final class OperationInterruptedFailure extends AuthFailure {
+  @override
+  String get code => 'interrupted';
+
+  /// Creates an instance of [OperationInterruptedFailure].
+  const OperationInterruptedFailure({
+    super.stackTrace,
+    super.parentException,
+  }) : super('');
+}
+
+/// Client configuration error.
+final class ClientConfigurationFailure extends AuthFailure {
+  @override
+  String get code => 'clientConfigurationError';
+
+  /// Creates an instance of [ClientConfigurationFailure].
+  const ClientConfigurationFailure({
+    super.stackTrace,
+    super.parentException,
+  }) : super('');
+}
+
+/// Provider configuration error.
+final class ProviderConfigurationFailure extends AuthFailure {
+  @override
+  String get code => 'providerConfigurationError';
+
+  /// Creates an instance of [ProviderConfigurationFailure].
+  const ProviderConfigurationFailure({
+    super.stackTrace,
+    super.parentException,
+  }) : super('');
+}
+
+/// UI unavailable error.
+final class UIUnavailableFailure extends AuthFailure {
+  @override
+  String get code => 'uiUnavailable';
+
+  /// Creates an instance of [UIUnavailableFailure].
+  const UIUnavailableFailure({
+    super.stackTrace,
+    super.parentException,
+  }) : super('');
+}
+
+/// Operation cancelled error.
+final class UserMismatchFailure extends AuthFailure {
+  @override
+  String get code => 'userMismatch';
+
+  /// Creates an instance of [UserMismatchFailure].
+  const UserMismatchFailure({
+    super.stackTrace,
+    super.parentException,
+  }) : super('');
+}
+
 /// Unknown authentication error.
 final class UnknownAuthFailure extends AuthFailure {
   @override

lib/features/auth/data/mappers/google_auth_failure_mapper.dart

@@ -0,0 +1,45 @@
+import 'package:google_sign_in/google_sign_in.dart';
+
+import '../../../../core/failures/feature/auth/auth_failure.dart';
+
+/// Extension for converting [GoogleSignInException] to domain [AuthFailure].
+extension GoogleAuthFailureMapper on GoogleSignInException {
+  /// Converts [GoogleSignInException] to domain [AuthFailure].
+  ///
+  /// Returns a specific [AuthFailure] subclass based on the Google Sign In error code,
+  /// or [UnknownAuthFailure] for unmapped error codes.
+  AuthFailure toAuthFailure([StackTrace? stackTrace]) {
+    return switch (code) {
+      GoogleSignInExceptionCode.canceled => OperationCancelledFailure(
+        parentException: this,
+        stackTrace: stackTrace,
+      ),
+      GoogleSignInExceptionCode.interrupted => OperationInterruptedFailure(
+        parentException: this,
+        stackTrace: stackTrace,
+      ),
+      GoogleSignInExceptionCode.clientConfigurationError => ClientConfigurationFailure(
+        parentException: this,
+        stackTrace: stackTrace,
+      ),
+      GoogleSignInExceptionCode.providerConfigurationError => ProviderConfigurationFailure(
+        parentException: this,
+        stackTrace: stackTrace,
+      ),
+      GoogleSignInExceptionCode.uiUnavailable => UIUnavailableFailure(
+        parentException: this,
+        stackTrace: stackTrace,
+      ),
+      GoogleSignInExceptionCode.userMismatch => UserMismatchFailure(
+        parentException: this,
+        stackTrace: stackTrace,
+      ),
+      GoogleSignInExceptionCode.unknownError => UnknownAuthFailure(
+        'unknownError',
+        originalMessage: description,
+        parentException: this,
+        stackTrace: stackTrace,
+      ),
+    };
+  }
+}