feat: 다솜소식 수정, 삭제기능 추가

Author: dohy-eon

src/main/java/dmu/dasom/api/domain/news/entity/NewsEntity.java

@@ -5,7 +5,9 @@
 import dmu.dasom.api.domain.news.dto.NewsResponseDto;
 import io.swagger.v3.oas.annotations.media.Schema;
 import jakarta.persistence.*;
+import jakarta.validation.constraints.NotBlank;
 import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Size;
 import lombok.*;
 
 @Getter
@@ -44,4 +46,25 @@ public void updateStatus(Status status) {
     public NewsResponseDto toResponseDto() {
         return new NewsResponseDto(id, title, content, getCreatedAt(), imageUrl);
     }
+
+    //수정기능
+    public void update(String title, String content, String imageUrl) {
+        if (title == null || title.isBlank()) {
+            throw new IllegalArgumentException("제목은 필수입니다");
+        }
+        if (title.length() > 100) {
+            throw new IllegalArgumentException("제목은 100자까지");
+        }
+        if (content == null || content.isBlank()) {
+            throw new IllegalArgumentException("내용은 필수입니다");
+        }
+        if (imageUrl != null && imageUrl.length() > 255) {
+            throw new IllegalArgumentException("이미지 URL은 255자까지");
+        }
+
+        this.title = title;
+        this.content = content;
+        this.imageUrl = imageUrl;
+    }
+
 }

src/main/java/dmu/dasom/api/domain/news/service/NewsService.java

@@ -5,6 +5,7 @@
 import dmu.dasom.api.domain.news.entity.NewsEntity;
 import dmu.dasom.api.domain.news.repository.NewsRepository;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
 import java.util.List;
 import java.util.stream.Collectors;
 
@@ -43,4 +44,22 @@ public NewsResponseDto createNews(NewsRequestDto requestDto) {
         return savedNews.toResponseDto();
     }
 
-}
+    // 수정
+    @Transactional
+    public NewsResponseDto updateNews(Long id, NewsRequestDto requestDto) {
+        NewsEntity news = newsRepository.findById(id)
+                .orElseThrow(() -> new IllegalArgumentException("해당 뉴스가 존재하지 않습니다. ID: " + id));
+
+        news.update(requestDto.getTitle(), requestDto.getContent(), requestDto.getImageUrl());
+        return news.toResponseDto();
+    }
+
+    // 삭제
+    @Transactional
+    public void deleteNews(Long id) {
+        NewsEntity news = newsRepository.findById(id)
+                .orElseThrow(() -> new IllegalArgumentException("해당 뉴스가 존재하지 않습니다. ID: " + id));
+
+        newsRepository.delete(news);
+    }
+}