fix: 탈퇴 유저 알림 및 FCM 처리 차단

Author: pooreumjung

src/main/java/com/semosan/api/domain/notification/service/FcmTokenService.java

@@ -5,6 +5,7 @@
 import com.semosan.api.domain.notification.entity.FcmToken;
 import com.semosan.api.domain.notification.repository.FcmTokenRepository;
 import com.semosan.api.domain.user.enums.user.DeviceType;
+import com.semosan.api.domain.user.service.UserReader;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
@@ -16,13 +17,15 @@
 public class FcmTokenService {
 
     private final FcmTokenRepository fcmTokenRepository;
+    private final UserReader userReader;
 
     /**
      * 토큰 등록
      * 같은 토큰이 이미 있으면 (다른 유저로 로그인 등) 소유자/디바이스 갱신
      */
     @Transactional
     public void register(Long userId, String token, DeviceType deviceType) {
+        userReader.findActiveUserById(userId);
         fcmTokenRepository.findByToken(token).ifPresentOrElse(
                 existing -> existing.reassignTo(userId, deviceType),
                 () -> fcmTokenRepository.save(FcmToken.create(userId, token, deviceType))
@@ -35,6 +38,7 @@ public void register(Long userId, String token, DeviceType deviceType) {
      */
     @Transactional
     public void delete(Long userId, String token) {
+        userReader.findActiveUserById(userId);
         fcmTokenRepository.findByToken(token).ifPresent(fcmToken -> {
             if (!fcmToken.getUserId().equals(userId)) {
                 throw new GeneralException(ErrorStatus.FORBIDDEN);

src/main/java/com/semosan/api/domain/notification/service/NotificationService.java

@@ -43,7 +43,7 @@ public class NotificationService {
      */
     @Transactional
     public void send(Long receiverId, NotificationType type, Map<String, Object> params) {
-        if (!userRepository.existsById(receiverId)) {
+        if (!userRepository.existsByIdAndDeletedFalse(receiverId)) {
             throw new GeneralException(ErrorStatus.USER_NOT_FOUND);
         }
 

src/main/java/com/semosan/api/domain/user/repository/UserRepository.java

@@ -13,4 +13,6 @@ public interface UserRepository extends JpaRepository<User, Long> {
     Optional<User> findByIdAndDeletedFalse(Long id);
 
     boolean existsByNicknameAndDeletedFalse(String nickname);
+
+    boolean existsByIdAndDeletedFalse(Long id);
 }