Kakao 로그인(카카오 SDK · 서버 커스텀 토큰)과 LINE 로그인(Firebase OIDC) 연결 · SNS 연동 · 인증 취소 처리

2026-10-05 19:01:28 +09:00
parent f483e8d94b
commit c301f3a1db
23 changed files with 1179 additions and 53 deletions
@@ -0,0 +1,177 @@
+import 'dart:async';
+
+import 'package:fancake/core/firebase/firebase_boot.dart';
+import 'package:fancake/features/auth/auth.dart';
+import 'package:fancake/features/auth/auth_repository.dart';
+import 'package:fancake/features/auth/firebase_account_linker.dart';
+import 'package:fancake/features/auth/social_providers.dart';
+import 'package:firebase_auth/firebase_auth.dart' as fb;
+import 'package:firebase_auth_mocks/firebase_auth_mocks.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/widgets.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+/// LINE OIDC 제공자 — 실 로그인은 못 하고,
+/// Firebase 호출 전후 계약(결과 매핑·취소·연결)만 확인한다.
+void main() {
+  // Android 에서 signIn 이 앱 생명주기를 듣는다(untilAbandoned).
+  TestWidgetsFlutterBinding.ensureInitialized();
+  setUp(() => FirebaseBoot.debugSetMode(FirebaseMode.live, reason: 'OIDC 테스트'));
+  tearDown(
+    () => FirebaseBoot.debugSetMode(FirebaseMode.mock, reason: 'OIDC 테스트 끝'),
+  );
+
+  OidcSignInProvider line(fb.FirebaseAuth auth) => OidcSignInProvider(
+    AuthProviderKind.line,
+    providerId: 'oidc.line',
+    firebaseAuth: auth,
+  );
+
+  test('기본 목록: LINE 은 Firebase OIDC, 카카오는 SDK + 서버 커스텀 토큰', () {
+    final providers = {
+      for (final p in AuthRepository().providers) p.provider: p,
+    };
+    final p = providers[AuthProviderKind.line];
+    expect(p, isA<OidcSignInProvider>());
+    expect(p!.isLive, isTrue);
+    expect(
+      (p as OidcSignInProvider).providerId,
+      FirebaseAccountLinker.providerIds[AuthProviderKind.line],
+    );
+    expect(p.authProvider.providerId, 'oidc.line');
+    expect(providers[AuthProviderKind.kakao], isA<KakaoSignInProvider>());
+  });
+
+  test('Firebase 설정이 없으면 SDK 를 부르지 않고 미설정으로 닫는다', () async {
+    FirebaseBoot.debugSetMode(FirebaseMode.mock, reason: '설정 없음');
+    final outcome = await line(_ThrowingAuth('should-not-call')).signIn();
+    expect(outcome, isA<AuthNotConfigured>());
+  });
+
+  test('성공하면 LINE 계정으로 로그인된다', () async {
+    final auth = MockFirebaseAuth(mockUser: MockUser(uid: 'k-1'));
+    final outcome = await line(auth).signIn();
+    expect(outcome, isA<AuthSucceeded>());
+    expect((outcome as AuthSucceeded).account.provider, AuthProviderKind.line);
+    expect(outcome.account.uid, 'k-1');
+  });
+
+  test('인가 화면을 닫으면 Android·iOS 철자 모두 취소로 본다', () async {
+    for (final code in ['web-context-canceled', 'web-context-cancelled']) {
+      final outcome = await line(_ThrowingAuth(code)).signIn();
+      expect(outcome, isA<AuthCancelled>(), reason: code);
+    }
+  });
+
+  test('콘솔에서 제공자를 안 켰으면 E-AUTH-11', () async {
+    final outcome = await line(_ThrowingAuth('operation-not-allowed')).signIn();
+    expect((outcome as AuthFailed).code, 'E-AUTH-11');
+  });
+
+  test('Android 의 LINE 은 앱 자동 로그인을 끈다 · iOS 는 파라미터 없음', () {
+    final line =
+        AuthRepository().providers.firstWhere(
+              (p) => p.provider == AuthProviderKind.line,
+            )
+            as OidcSignInProvider;
+    expect(line.authProvider.parameters, {'disable_auto_login': 'true'});
+    debugDefaultTargetPlatformOverride = TargetPlatform.iOS;
+    addTearDown(() => debugDefaultTargetPlatformOverride = null);
+    expect(line.authProvider.parameters, isEmpty);
+  });
+
+  testWidgets('Android: 앱으로 돌아왔는데 결과가 없으면 취소로 풀린다', (tester) async {
+    late AuthOutcome outcome;
+    line(_HangingAuth()).signIn().then((o) => outcome = o);
+    void go(List<AppLifecycleState> states) =>
+        states.forEach(tester.binding.handleAppLifecycleStateChanged);
+    const inactive = AppLifecycleState.inactive;
+    const hidden = AppLifecycleState.hidden;
+    go([inactive, hidden, AppLifecycleState.paused]); // Custom Tab 으로 나감
+    await tester.pump(const Duration(minutes: 1)); // 브라우저에 오래 있어도 그대로
+    go([hidden, inactive, AppLifecycleState.resumed]); // 앱으로 돌아옴
+    await tester.pump(const Duration(seconds: 9));
+    expect(outcome, isA<AuthCancelled>());
+  });
+
+  group('계정 연결', () {
+    test('같은 UID 에 oidc.line 을 붙인다', () async {
+      final user = _LinkingUser(linkedEmail: 'fan@fanuzu.co.kr');
+      final auth = MockFirebaseAuth(signedIn: true, mockUser: user);
+      final linker = FirebaseAccountLinker(
+        providers: [line(auth)],
+        firebaseAuth: auth,
+      );
+
+      final outcome = await linker.link(AuthProviderKind.line);
+
+      expect(outcome, isA<AuthSucceeded>());
+      expect(linker.linkedAccounts.keys, contains(AuthProviderKind.line));
+    });
+
+    test('다른 이메일의 LINE 계정은 붙였다가 바로 떼고 E-AUTH-08', () async {
+      final user = _LinkingUser(linkedEmail: 'someone@else.com');
+      final auth = MockFirebaseAuth(signedIn: true, mockUser: user);
+      final linker = FirebaseAccountLinker(
+        providers: [line(auth)],
+        firebaseAuth: auth,
+      );
+
+      final outcome = await linker.link(AuthProviderKind.line);
+
+      expect((outcome as AuthFailed).code, 'E-AUTH-08');
+      expect(
+        linker.linkedAccounts.keys,
+        isNot(contains(AuthProviderKind.line)),
+      );
+    });
+  });
+}
+
+class _ThrowingAuth extends MockFirebaseAuth {
+  _ThrowingAuth(this.code);
+  final String code;
+
+  @override
+  Future<fb.UserCredential> signInWithProvider(fb.AuthProvider provider) =>
+      throw fb.FirebaseAuthException(code: code);
+}
+
+/// 콜백을 잃어 영영 끝나지 않는 Firebase 대기 Task.
+class _HangingAuth extends MockFirebaseAuth {
+  @override
+  Future<fb.UserCredential> signInWithProvider(fb.AuthProvider provider) =>
+      Completer<fb.UserCredential>().future;
+}
+
+/// Google 로 가입한 사용자. 연결하면 [linkedEmail] 을 가진 제공자 정보가 붙는다.
+// ignore: must_be_immutable
+class _LinkingUser extends MockUser {
+  _LinkingUser({required this.linkedEmail})
+    : super(
+        uid: 'u-1',
+        email: 'fan@fanuzu.co.kr',
+        providerData: [_info('google.com', 'fan@fanuzu.co.kr')],
+      );
+
+  final String linkedEmail;
+
+  @override
+  Future<fb.UserCredential> linkWithProvider(fb.AuthProvider provider) async {
+    final result = await super.linkWithProvider(provider);
+    providerData
+      ..removeLast()
+      ..add(_info(provider.providerId, linkedEmail));
+    return result;
+  }
+}
+
+fb.UserInfo _info(String providerId, String email) =>
+    // ignore: invalid_use_of_protected_member
+    fb.UserInfo.fromJson({
+      'uid': 'p-$providerId',
+      'email': email,
+      'providerId': providerId,
+      'isAnonymous': false,
+      'isEmailVerified': true,
+    });