From 7bfc4faa134e9f9e5bd0dea4e7bf4e15f86e7b23 Mon Sep 17 00:00:00 2001
From: Sn-Kinos <dony435@naver.com>
Date: Tue, 6 Oct 2026 02:24:26 +0900
Subject: [PATCH] =?UTF-8?q?Kakao=20=EC=9D=B8=EA=B0=80=C2=B7=ED=86=A0?=
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---
 app/lib/features/auth/social_providers.dart | 12 ++++++++----
 app/test/auth_kakao_test.dart               | 19 +++++++++++++++++++
 2 files changed, 27 insertions(+), 4 deletions(-)

diff --git a/app/lib/features/auth/social_providers.dart b/app/lib/features/auth/social_providers.dart
index 08f0bd6..7ab2b18 100644
--- a/app/lib/features/auth/social_providers.dart
+++ b/app/lib/features/auth/social_providers.dart
@@ -396,6 +396,13 @@ final class KakaoSignInProvider implements SocialAuthProvider {
       if (error.error == kakao.AuthErrorCause.accessDenied) {
         return const AuthCancelled();
       }
+      // 카카오톡 왕복 뒤 인가 코드 · 토큰 단계 실패(KOE · misconfigured 등). 원인을 로그로만 남긴다.
+      debugPrint(
+        '[KakaoSignInProvider] auth failed: ${error.error} ${error.errorDescription}',
+      );
+      return const AuthFailed('E-AUTH-03', '소셜 로그인에 실패했습니다.');
+    } on kakao.KakaoException catch (error) {
+      debugPrint('[KakaoSignInProvider] sdk error: $error');
       return const AuthFailed('E-AUTH-03', '소셜 로그인에 실패했습니다.');
     } on FirebaseFunctionsException catch (error) {
       final details = error.details;
@@ -407,10 +414,7 @@ final class KakaoSignInProvider implements SocialAuthProvider {
           '가입하신 이메일과 다른 계정입니다.',
         'E-AUTH-08' => '다른 FANUZU 계정에 이미 연결된 소셜 계정입니다.',
         'E-AUTH-09' => '이미 연결된 계정입니다.',
-        _ =>
-          flow == AuthFlow.link
-              ? '계정 연결에 실패했습니다.'
-              : '소셜 로그인에 실패했습니다.',
+        _ => flow == AuthFlow.link ? '계정 연결에 실패했습니다.' : '소셜 로그인에 실패했습니다.',
       });
     } on fb.FirebaseAuthException catch (error) {
       return AuthFailed(authCatalogCode(error), authMessage(error, flow: flow));
diff --git a/app/test/auth_kakao_test.dart b/app/test/auth_kakao_test.dart
index 6af6143..2e89df0 100644
--- a/app/test/auth_kakao_test.dart
+++ b/app/test/auth_kakao_test.dart
@@ -6,6 +6,8 @@ import 'package:fancake/features/auth/social_providers.dart';
 import 'package:firebase_auth_mocks/firebase_auth_mocks.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:kakao_flutter_sdk_user/kakao_flutter_sdk_user.dart'
+    as kakao_sdk;
 
 /// 카카오 — SDK 로그인(주입) → 서버 교환(주입) → signInWithCustomToken 계약.
 /// 토큰 검증·기존 oidc.kakao 사용자 매핑은 서버 테스트(functions/test/auth_kakao.test.ts)가 본다.
@@ -61,6 +63,23 @@ void main() {
     expect(sent, isEmpty);
   });
 
+  test('카카오 인가 · 토큰 단계 실패는 로그인 실패(E-AUTH-03) · 서버를 부르지 않는다', () async {
+    for (final error in [
+      kakao_sdk.KakaoAuthException(
+        kakao_sdk.AuthErrorCause.misconfigured,
+        'KOE',
+      ),
+      kakao_sdk.KakaoClientException(kakao_sdk.ClientErrorCause.unknown, 'sdk'),
+    ]) {
+      final outcome = await kakao(
+        MockFirebaseAuth(),
+        token: () async => throw error,
+      ).signIn();
+      expect((outcome as AuthFailed).code, 'E-AUTH-03', reason: '$error');
+    }
+    expect(sent, isEmpty);
+  });
+
   test('서버 오류는 카탈로그 코드로 · 로그인하지 않는다', () async {
     final auth = MockFirebaseAuth();
     final outcome = await kakao(