fix(ui): fix sign out issue on desktop and web (#8331)

Author: lesnitsky

packages/flutterfire_ui/lib/src/auth/oauth/oauth_providers.dart

@@ -67,6 +67,7 @@ abstract class OAuthProvider {
     return credential;
   }
 
+  Future<void> logOutProvider();
   Future<void> signOut() async {}
 }
 

packages/flutterfire_ui/lib/src/auth/oauth/providers/apple_provider.dart

@@ -72,6 +72,11 @@ class AppleProviderImpl extends AppleProvider {
 
   @override
   dynamic get firebaseAuthProvider => null;
+
+  @override
+  Future<void> logOutProvider() {
+    return SynchronousFuture(null);
+  }
 }
 
 class AppleProviderConfiguration

packages/flutterfire_ui/lib/src/auth/oauth/providers/facebook_provider.dart

@@ -8,14 +8,16 @@ import 'package:desktop_webview_auth/facebook.dart';
 import 'package:flutterfire_ui/auth.dart';
 
 import '../../widgets/internal/oauth_provider_button_style.dart';
-import '../../oauth/provider_resolvers.dart';
+import '../provider_resolvers.dart';
 import '../../auth_flow.dart';
 import '../oauth_providers.dart';
 
+import 'sign_out_mixin.dart' if (dart.library.html) 'sign_out_mixin_web.dart';
+
 abstract class FacebookProvider extends OAuthProvider {}
 
-class FacebookProviderImpl extends FacebookProvider {
-  final _provider = FacebookAuth.instance;
+class FacebookProviderImpl extends FacebookProvider with SignOutMixin {
+  final provider = FacebookAuth.instance;
   final String clientId;
   final String redirectUri;
 
@@ -32,7 +34,7 @@ class FacebookProviderImpl extends FacebookProvider {
 
   @override
   Future<OAuthCredential> signIn() async {
-    final result = await _provider.login();
+    final result = await provider.login();
 
     switch (result.status) {
       case LoginStatus.success:
@@ -49,18 +51,18 @@ class FacebookProviderImpl extends FacebookProvider {
     }
   }
 
-  @override
-  Future<void> signOut() async {
-    await _provider.logOut();
-  }
-
   @override
   OAuthCredential fromDesktopAuthResult(AuthResult result) {
     return FacebookAuthProvider.credential(result.accessToken!);
   }
 
   @override
   FacebookAuthProvider get firebaseAuthProvider => FacebookAuthProvider();
+
+  @override
+  Future<void> logOutProvider() async {
+    await provider.logOut();
+  }
 }
 
 class FacebookProviderConfiguration
@@ -73,7 +75,7 @@ class FacebookProviderConfiguration
     this.redirectUri,
   });
 
-  FacebookProvider get _provider => FacebookProviderImpl(
+  FacebookProvider get provider => FacebookProviderImpl(
         clientId: clientId,
         redirectUri: redirectUri ?? defaultRedirectUri,
       );
@@ -83,7 +85,7 @@ class FacebookProviderConfiguration
 
   @override
   FacebookProvider createProvider() {
-    return _provider;
+    return provider;
   }
 
   @override

packages/flutterfire_ui/lib/src/auth/oauth/providers/google_provider.dart

@@ -13,17 +13,19 @@ import '../../widgets/internal/oauth_provider_button_style.dart';
 import '../oauth_providers.dart';
 import '../provider_resolvers.dart';
 
+import 'sign_out_mixin.dart' if (dart.library.html) 'sign_out_mixin_web.dart';
+
 const _firebaseAuthProviderParameters = {
   'prompt': 'select_account',
 };
 
 abstract class GoogleProvider extends OAuthProvider {}
 
-class GoogleProviderImpl extends GoogleProvider {
+class GoogleProviderImpl extends GoogleProvider with SignOutMixin {
   String clientId;
   String redirectUri;
 
-  final _provider = GoogleSignIn();
+  late final provider = GoogleSignIn(clientId: clientId);
 
   @override
   final GoogleAuthProvider firebaseAuthProvider = GoogleAuthProvider();
@@ -43,7 +45,7 @@ class GoogleProviderImpl extends GoogleProvider {
 
   @override
   Future<OAuthCredential> signIn() async {
-    final user = await _provider.signIn();
+    final user = await provider.signIn();
 
     if (user == null) {
       throw AuthCancelledException();
@@ -59,19 +61,18 @@ class GoogleProviderImpl extends GoogleProvider {
     return credential;
   }
 
-  @override
-  Future<void> signOut() async {
-    await _provider.signOut();
-    await super.signOut();
-  }
-
   @override
   OAuthCredential fromDesktopAuthResult(AuthResult result) {
     return GoogleAuthProvider.credential(
       idToken: result.idToken,
       accessToken: result.accessToken,
     );
   }
+
+  @override
+  Future<void> logOutProvider() async {
+    await provider.signOut();
+  }
 }
 
 class GoogleProviderConfiguration

packages/flutterfire_ui/lib/src/auth/oauth/providers/sign_out_mixin.dart

@@ -0,0 +1,13 @@
+import 'dart:io';
+
+import '../oauth_providers.dart';
+
+mixin SignOutMixin on OAuthProvider {
+  @override
+  Future<void> signOut() async {
+    if (Platform.isAndroid || Platform.isIOS) {
+      await logOutProvider();
+    }
+    return super.signOut();
+  }
+}

packages/flutterfire_ui/lib/src/auth/oauth/providers/sign_out_mixin_web.dart

@@ -0,0 +1,3 @@
+import '../oauth_providers.dart';
+
+mixin SignOutMixin on OAuthProvider {}

packages/flutterfire_ui/lib/src/auth/oauth/providers/twitter_provider.dart

@@ -6,15 +6,17 @@ import 'package:flutter/foundation.dart';
 import 'package:twitter_login/twitter_login.dart';
 
 import 'package:flutterfire_ui/auth.dart';
-import '../../oauth/provider_resolvers.dart';
+import '../provider_resolvers.dart';
 import '../../widgets/internal/oauth_provider_button_style.dart';
 
 import '../../auth_flow.dart';
 import '../oauth_providers.dart';
 
+import 'sign_out_mixin.dart' if (dart.library.html) 'sign_out_mixin_web.dart';
+
 abstract class TwitterProvider extends OAuthProvider {}
 
-class TwitterProviderImpl extends TwitterProvider {
+class TwitterProviderImpl extends TwitterProvider with SignOutMixin {
   final String apiKey;
   final String apiSecretKey;
   final String redirectUri;
@@ -26,7 +28,7 @@ class TwitterProviderImpl extends TwitterProvider {
     redirectUri: redirectUri,
   );
 
-  late final _provider = TwitterLogin(
+  late final provider = TwitterLogin(
     apiKey: apiKey,
     apiSecretKey: apiSecretKey,
     redirectURI: redirectUri,
@@ -40,7 +42,7 @@ class TwitterProviderImpl extends TwitterProvider {
 
   @override
   Future<OAuthCredential> signIn() async {
-    final result = await _provider.login();
+    final result = await provider.login();
 
     switch (result.status) {
       case null:
@@ -67,6 +69,11 @@ class TwitterProviderImpl extends TwitterProvider {
 
   @override
   TwitterAuthProvider get firebaseAuthProvider => TwitterAuthProvider();
+
+  @override
+  Future<void> logOutProvider() {
+    return SynchronousFuture(null);
+  }
 }
 
 class TwitterProviderConfiguration