user 삭제 기능 구현

src/main/java/learningFlow/learningFlow_BE/apiPayload/code/status/ErrorStatus.java

@@ -30,6 +30,7 @@ public enum ErrorStatus implements BaseErrorCode {
 
     USER_NOT_FOUND(HttpStatus.BAD_REQUEST, "USER4001", "사용자를 찾을 수 없습니다."),
     NICKNAME_NOT_EXIST(HttpStatus.BAD_REQUEST, "USER4002", "닉네임은 필수 입니다."),
+    WITHDRAWAL_FAILED(HttpStatus.INTERNAL_SERVER_ERROR, "USER5001", "계정 탈퇴 처리 중 오류가 발생했습니다."),
 
     // 비밀번호 관련 에러 추가
     INVALID_PASSWORD(HttpStatus.BAD_REQUEST, "PASSWORD4001", "유효하지 않은 비밀번호입니다."),

src/main/java/learningFlow/learningFlow_BE/repository/MemoRepository.java

@@ -3,6 +3,7 @@
 import learningFlow.learningFlow_BE.domain.Memo;
 import learningFlow.learningFlow_BE.domain.MemoId;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Modifying;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.query.Param;
 
@@ -11,4 +12,8 @@
 public interface MemoRepository extends JpaRepository<Memo, MemoId> {
     @Query("SELECT m FROM Memo m WHERE m.id.collectionEpisodeId = :episodeId")
     Optional<Memo> findByEpisodeId(@Param("episodeId") Long episodeId);
-}
+
+    @Modifying
+    @Query("DELETE FROM Memo m WHERE m.id.userId = :loginId")
+    void deleteAllByUserId(@Param("loginId") String loginId);
+}

src/main/java/learningFlow/learningFlow_BE/repository/UserCollectionRepository.java

@@ -3,13 +3,21 @@
 import learningFlow.learningFlow_BE.domain.Collection;
 import learningFlow.learningFlow_BE.domain.User;
 import learningFlow.learningFlow_BE.domain.UserCollection;
-import org.springframework.data.jpa.repository.JpaRepository;
 import learningFlow.learningFlow_BE.domain.enums.UserCollectionStatus;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Modifying;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+
 import java.util.List;
 import java.util.Optional;
 
 public interface UserCollectionRepository extends JpaRepository<UserCollection, Long> {
     Optional<UserCollection> findByUserAndCollection(User user, Collection collection);
     List<UserCollection> findByUserAndStatusOrderByCompletedTimeDesc(User user, UserCollectionStatus status);
     Optional<UserCollection> findFirstByUserAndStatusOrderByUpdatedAtDesc(User user, UserCollectionStatus status);
+
+    @Modifying
+    @Query("DELETE FROM UserCollection uc WHERE uc.user.loginId = :loginId")
+    void deleteAllByUserId(@Param("loginId") String loginId);
 }

src/main/java/learningFlow/learningFlow_BE/repository/UserEpisodeProgressRepository.java

@@ -3,6 +3,12 @@
 import learningFlow.learningFlow_BE.domain.UserEpisodeProgress;
 import learningFlow.learningFlow_BE.domain.UserEpisodeProgressId;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Modifying;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
 
 public interface UserEpisodeProgressRepository extends JpaRepository<UserEpisodeProgress, UserEpisodeProgressId> {
-}
+    @Modifying
+    @Query("DELETE FROM UserEpisodeProgress uep WHERE uep.id.userId = :loginId")
+    void deleteAllByUserId(@Param("loginId") String loginId);
+}

src/main/java/learningFlow/learningFlow_BE/service/user/UserService.java

@@ -10,6 +10,7 @@
 import learningFlow.learningFlow_BE.domain.Collection;
 import learningFlow.learningFlow_BE.domain.enums.UserCollectionStatus;
 import learningFlow.learningFlow_BE.domain.uuid.UuidRepository;
+import learningFlow.learningFlow_BE.repository.MemoRepository;
 import learningFlow.learningFlow_BE.repository.UserCollectionRepository;
 import learningFlow.learningFlow_BE.repository.UserEpisodeProgressRepository;
 import learningFlow.learningFlow_BE.repository.UserRepository;
@@ -43,6 +44,7 @@ public class UserService {
     private final UuidRepository uuidRepository;
     private final CollectionService collectionService;
     private final UserEpisodeProgressRepository userEpisodeProgressRepository;
+    private final MemoRepository memoRepository;
 
     private static final int BOOKMARK_PAGE_SIZE = 8;
 
@@ -238,4 +240,28 @@ public UserResponseDTO.UserMyPageResponseDTO getUserMyPageResponseDTO(String log
 
         return UserConverter.convertToUserMyPageResponseDTO(user, recentlyWatchedEpisodeDTOList, completedCollectionList);
     }
+
+    @Transactional
+    public void withdrawUser(String loginId) {
+        User user = userRepository.findById(loginId)
+                .orElseThrow(() -> new UserHandler(ErrorStatus.USER_NOT_FOUND));
+
+        try {
+            // 유저의 메모 삭제
+            memoRepository.deleteAllByUserId(loginId);
+
+            // 유저의 학습 진도 삭제
+            userEpisodeProgressRepository.deleteAllByUserId(loginId);
+
+            // 유저의 컬렉션 관계 삭제
+            userCollectionRepository.deleteAllByUserId(loginId);
+
+            // 유저 완전 삭제
+            userRepository.delete(user);
+
+        } catch (Exception e) {
+            throw new UserHandler(ErrorStatus.WITHDRAWAL_FAILED);
+        }
+    }
+
 }

src/main/java/learningFlow/learningFlow_BE/web/controller/UserRestController.java

@@ -279,4 +279,44 @@ public ApiResponse<String> goChangeEmail(
         EmailVerificationToken verificationToken = localUserAuthService.validateRegistrationToken(emailResetCode);
         return ApiResponse.onSuccess(localUserAuthService.changeEmail(verificationToken));
     }
+
+    @DeleteMapping("/withdraw")
+    @Operation(summary = "회원 탈퇴 API", description = """
+        회원 탈퇴를 처리합니다.
+
+        [처리 내용]
+        - 계정 영구 삭제
+        - 모든 개인 데이터 삭제
+          * 학습 데이터
+          * 메모
+          * 북마크
+          * 프로필 정보
+
+        [주의사항]
+        - 탈퇴 후 데이터 복구 불가능
+        - 탈퇴 후 동일 이메일로 새로운 계정 생성 가능
+        """)
+    @ApiResponses({
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(
+                    responseCode = "200",
+                    description = "탈퇴 성공"
+            ),
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(
+                    responseCode = "401",
+                    description = "로그인이 필요한 서비스입니다.",
+                    content = @Content(schema = @Schema(implementation = ApiResponse.class))
+            ),
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(
+                    responseCode = "500",
+                    description = "계정 탈퇴 처리 중 오류가 발생했습니다.",
+                    content = @Content(schema = @Schema(implementation = ApiResponse.class))
+            )
+    })
+    public ApiResponse<String> withdrawUser(
+            @AuthenticationPrincipal PrincipalDetails principalDetails
+    ) {
+        userService.withdrawUser(principalDetails.getUser().getLoginId());
+        return ApiResponse.onSuccess("회원 탈퇴가 완료되었습니다.");
+    }
+
 }