feat: add sign in with credential

Author: funwithflutter

lib/src/application/auth/sign_in_handler/sign_in_handler_state_notifier.dart

@@ -1,4 +1,5 @@
 import 'package:dartz/dartz.dart';
+import 'package:firebase_auth/firebase_auth.dart';
 import 'package:flutter/foundation.dart';
 import 'package:state_notifier/state_notifier.dart';
 
@@ -55,6 +56,7 @@ class SignInHandlerStateNotifier extends StateNotifier<SignInHandlerState>
       isSubmitting: true,
       authFailureOrSuccessOption: none(),
     );
+
     final auth = await _authFacade.signInWithGoogle();
 
     if (mounted) {
@@ -65,6 +67,22 @@ class SignInHandlerStateNotifier extends StateNotifier<SignInHandlerState>
     }
   }
 
+  Future<void> signInWithCredential(AuthCredential credential) async {
+    state = state.copyWith(
+      isSubmitting: true,
+      authFailureOrSuccessOption: none(),
+    );
+
+    final auth = await _authFacade.signInWithCredential(credential);
+
+    if (mounted) {
+      state = state.copyWith(
+        isSubmitting: false,
+        authFailureOrSuccessOption: some(auth),
+      );
+    }
+  }
+
   Future<void> signInAnonymously() async {
     if (!_authProviders.anonymous) {
       throw AuthProviderNotEnabled('Anonymous');

lib/src/domain/auth/i_auth_facade.dart

@@ -1,3 +1,4 @@
+import 'package:firebase_auth/firebase_auth.dart';
 import 'package:flutter/foundation.dart';
 
 import 'auth.dart';
@@ -18,6 +19,7 @@ abstract class AuthFacade {
     @required Password password,
   });
   Future<Auth> signInWithGoogle();
+  Future<Auth> signInWithCredential(AuthCredential credential);
   Future<Auth> signInAnonymously();
   Future<void> signOut();
 }

lib/src/infrastructure/firebase_auth_facade.dart

@@ -250,6 +250,16 @@ class FirebaseAuthFacade implements AuthFacade {
     }
   }
 
+  @override
+  Future<Auth> signInWithCredential(AuthCredential credential) async {
+    try {
+      await _firebaseAuth.signInWithCredential(credential);
+      return const Auth.success();
+    } on PlatformException catch (_) {
+      return const Auth.failure(AuthFailure.serverError());
+    }
+  }
+
   @override
   Future<void> signOut() async {
     return Future.wait([

lib/src/presentation/core/extensions.dart

@@ -1,3 +1,4 @@
+import 'package:firebase_auth/firebase_auth.dart';
 import 'package:flutter/widgets.dart';
 import 'package:provider/provider.dart';
 
@@ -40,6 +41,14 @@ extension AuthContext on BuildContext {
         .signInWithGoogle();
   }
 
+  /// Sign in with Credentials
+  ///
+  /// Should only be used if your implementing your own third party sign-in
+  Future<void> signInWithCredential(AuthCredential credential) async {
+    Provider.of<SignInHandlerStateNotifier>(this, listen: false)
+        .signInWithCredential(credential);
+  }
+
   /// Perform Firebase anonymous sign-in
   ///
   /// Should only be used if you're creating your own custom sign-in form