게시글 삭제 API 구현

src/main/java/pilot/instagram/domain/post/PostController.java

@@ -8,6 +8,7 @@
 import org.springframework.http.HttpStatus;
 import org.springframework.web.bind.annotation.*;
 import pilot.instagram.domain.post.dto.request.PostRequest;
+import pilot.instagram.domain.post.dto.response.PostDeleteResponse;
 import pilot.instagram.domain.post.dto.response.PostPagingResponse;
 import pilot.instagram.domain.post.dto.response.PostResponse;
 import pilot.instagram.domain.post.service.PostService;
@@ -36,4 +37,10 @@ public ApiResponse<Page<PostPagingResponse>> getPosts(HttpSession session, Pagea
         String userId = session.getAttribute("userId").toString();
         return ApiResponse.of(HttpStatus.OK, postService.getPosts(userId, pageable));
     }
+
+    @DeleteMapping("/{postId}")
+    public ApiResponse<PostDeleteResponse> deletePost(@PathVariable("postId") Long postId, HttpSession session) {
+        String userId = session.getAttribute("userId").toString();
+        return ApiResponse.of(HttpStatus.OK, postService.deletePost(postId, userId));
+    }
 }

src/main/java/pilot/instagram/domain/post/dto/response/PostDeleteResponse.java

@@ -0,0 +1,21 @@
+package pilot.instagram.domain.post.dto.response;
+
+import lombok.Builder;
+import lombok.Getter;
+import pilot.instagram.domain.post.entity.Post;
+
+@Getter
+public class PostDeleteResponse {
+    private Long id;
+
+    @Builder
+    private PostDeleteResponse(Long id) {
+        this.id = id;
+    }
+
+    public static PostDeleteResponse of(Post post) {
+        return PostDeleteResponse.builder()
+                .id(post.getId())
+                .build();
+    }
+}

src/main/java/pilot/instagram/domain/post/service/PostService.java

@@ -6,6 +6,7 @@
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 import pilot.instagram.domain.post.dto.request.PostRequest;
+import pilot.instagram.domain.post.dto.response.PostDeleteResponse;
 import pilot.instagram.domain.post.dto.response.PostPagingResponse;
 import pilot.instagram.domain.post.dto.response.PostResponse;
 import pilot.instagram.domain.post.entity.Post;
@@ -38,4 +39,15 @@ public PostResponse getPost(Long postId) {
     public Page<PostPagingResponse> getPosts(String userId, Pageable pageable) {
         return postRepository.findPostByUserIdWithPaged(userId, pageable);
     }
+
+    @Transactional
+    public PostDeleteResponse deletePost(Long postId, String userId) {
+        Post post = postRepository.findById(postId)
+                .orElseThrow(() -> new IllegalArgumentException(ErrorCode.POST_NOT_FOUND.getMessage()));
+        if(!post.getUser().getId().equals(userId)) {
+            throw new IllegalArgumentException(ErrorCode.UNAUTHORIZED_POST_DELETE.getMessage());
+        }
+        postRepository.delete(post);
+        return PostDeleteResponse.of(post);
+    }
 }

src/main/java/pilot/instagram/exception/ErrorCode.java

@@ -12,7 +12,8 @@ public enum ErrorCode {
     USER_NOT_FOUND("아이디를 찾을 수 없습니다"),
 
     // POST
-    POST_NOT_FOUND("게시글을 찾을 수 없습니다.");
+    POST_NOT_FOUND("게시글을 찾을 수 없습니다."),
+    UNAUTHORIZED_POST_DELETE("게시글 삭제 권한이 없습니다.");
 
     private final String message;
 }