feat : 3차 세미나 실습 과제_blogService에 요청으로 들어온 memberId가 블로그의 소유주인지 확인하는 메…

…소드 추가 #7

week02/seminar/demo/src/main/java/com/example/demo/service/BlogService.java

@@ -14,6 +14,7 @@
 @Service
 @RequiredArgsConstructor
 public class BlogService {
+
   private final BlogRepository blogRepository;
   private final MemberService memberService;
 
@@ -24,7 +25,7 @@ public String create(Long memberId, BlogCreateRequest blogCreateRequest) {
     return blog.getId().toString();
   }
 
-  private Blog findById(Long blogId) {
+  public Blog findById(Long blogId) {
     return blogRepository.findById(blogId).orElseThrow(
         () -> new NotFoundException(ErrorMessage.BLOG_NOT_FOUND)
     );
@@ -36,4 +37,10 @@ public void updateTitle(Long blogId, BlogTitleUpdateRequest blogTitleUpdateReque
     blog.updateTitle(blogTitleUpdateRequest);
     //    blogRepository.save(blog); 이렇게 해도 됨.
   }
+
+  public void validateOwner(Long requestMemberId, Long findMemberId) {
+    if (!requestMemberId.equals(findMemberId)) {
+      throw new NotFoundException(ErrorMessage.BLOG_UNAUTHORIZED);
+    }
+  }
 }