Feat: 게시글 삭제 API 구현

Author: joyewon0705

src/main/java/com/back/domain/board/controller/PostController.java

@@ -81,4 +81,19 @@ public ResponseEntity<RsData<PostResponse>> updatePost(
                         response
                 ));
     }
+
+    // 게시글 삭제
+    @DeleteMapping("/{postId}")
+    public ResponseEntity<RsData<Void>> deletePost(
+            @PathVariable Long postId,
+            @AuthenticationPrincipal CustomUserDetails user
+    ) {
+        postService.deletePost(postId, user.getUserId());
+        return ResponseEntity
+                .status(HttpStatus.OK)
+                .body(RsData.success(
+                        "게시글이 삭제되었습니다.",
+                        null
+                ));
+    }
 }

src/main/java/com/back/domain/board/service/PostService.java

@@ -111,4 +111,24 @@ public PostResponse updatePost(Long postId, PostRequest request, Long userId) {
         // 응답 반환
         return PostResponse.from(post);
     }
+
+    /**
+     * 게시글 삭제 서비스
+     * 1. Post 조회
+     * 2. 작성자 검증
+     * 3. Post 삭제
+     */
+    public void deletePost(Long postId, Long userId) {
+        // Post 조회
+        Post post = postRepository.findById(postId)
+                .orElseThrow(() -> new CustomException(ErrorCode.POST_NOT_FOUND));
+
+        // 작성자 검증
+        if (!post.getUser().getId().equals(userId)) {
+            throw new CustomException(ErrorCode.POST_NO_PERMISSION);
+        }
+
+        // Post 삭제
+        postRepository.delete(post);
+    }
 }