refactor: 작성자 본인 체크 예외 던지는 부분 변경

Author: TTaiJin

src/main/java/com/example/log4u/domain/diary/entity/Diary.java

@@ -4,7 +4,6 @@
 import com.example.log4u.domain.diary.VisibilityType;
 import com.example.log4u.domain.diary.WeatherInfo;
 import com.example.log4u.domain.diary.dto.DiaryRequestDto;
-import com.example.log4u.domain.diary.exception.OwnerAccessDeniedException;
 
 import jakarta.persistence.Column;
 import jakarta.persistence.Entity;
@@ -76,9 +75,7 @@ public Long decreaseLikeCount() {
 		return this.likeCount;
 	}
 
-	public void validateOwner(Long userId) {
-		if (!this.userId.equals(userId)) {
-			throw new OwnerAccessDeniedException();
-		}
+	public boolean isOwner(Long userId) {
+		return this.userId.equals(userId);
 	}
 }

src/main/java/com/example/log4u/domain/diary/service/DiaryService.java

@@ -18,6 +18,7 @@
 import com.example.log4u.domain.diary.dto.DiaryResponseDto;
 import com.example.log4u.domain.diary.entity.Diary;
 import com.example.log4u.domain.diary.exception.NotFoundDiaryException;
+import com.example.log4u.domain.diary.exception.OwnerAccessDeniedException;
 import com.example.log4u.domain.diary.repository.DiaryRepository;
 import com.example.log4u.domain.follow.repository.FollowRepository;
 import com.example.log4u.domain.media.entity.Media;
@@ -99,7 +100,7 @@ public PageResponse<DiaryResponseDto> getDiariesByCursor(Long userId, Long targe
 	@Transactional
 	public void updateDiary(Long userId, Long diaryId, DiaryRequestDto request) {
 		Diary diary = findDiaryOrThrow(diaryId);
-		diary.validateOwner(userId);
+		validateOwner(diary, userId);
 
 		if (request.mediaList() != null) {
 			mediaService.updateMediaByDiaryId(diary.getDiaryId(), request.mediaList());
@@ -113,7 +114,7 @@ public void updateDiary(Long userId, Long diaryId, DiaryRequestDto request) {
 	@Transactional
 	public void deleteDiary(Long userId, Long diaryId) {
 		Diary diary = findDiaryOrThrow(diaryId);
-		diary.validateOwner(userId);
+		validateOwner(diary, userId);
 		mediaService.deleteMediaByDiaryId(diaryId);
 		diaryRepository.delete(diary);
 	}
@@ -155,6 +156,13 @@ private List<DiaryResponseDto> getDiaryResponsesWithMedia(List<Diary> diaries) {
 			.toList();
 	}
 
+	// 다이어리 작성자 본인 체크
+	private void validateOwner(Diary diary, Long userId) {
+		if (!diary.isOwner(userId)) {
+			throw new OwnerAccessDeniedException();
+		}
+	}
+
 	// 다이어리 목록 조회 시 권한 체크
 	private List<VisibilityType> determineAccessibleVisibilities(Long userId, Long targetUserId) {
 		if (userId.equals(targetUserId)) {