[FEAT] 임시저장된 게시글 단일 조회 기능 구현

src/main/java/com/back/catchmate/domain/board/controller/BoardController.java

@@ -69,6 +69,13 @@ public PagedBoardInfo getBoardListByUserId(@JwtValidation Long loginUserId,
         return boardService.getBoardListByUserId(loginUserId, userId, pageable);
     }
 
+    @GetMapping("/temp/{boardId}")
+    @Operation(summary = "임시저장된 게시글 단일 조회 API", description = "임시저장된 게시글 단일 조회하는 API 구현.")
+    public BoardInfo getBoardListByUserId(@JwtValidation Long userId,
+                                               @PathVariable Long boardId) {
+        return boardService.getTempBoard(userId, boardId);
+    }
+
     @PostMapping("/bookmark/{boardId}")
     @Operation(summary = "원하는 게시글을 찜하는 API", description = "원하는 게시글을 찜하는 API 입니다.")
     public StateResponse addBookMark(@JwtValidation Long userId,

src/main/java/com/back/catchmate/domain/board/repository/BoardRepository.java

@@ -19,4 +19,6 @@ public interface BoardRepository extends JpaRepository<Board, Long>, BoardReposi
     Optional<Board> findByIdAndDeletedAtIsNull(Long boardId);
 
     Page<Board> findAllByUserIdAndDeletedAtIsNullAndIsCompletedIsTrue(Long userId, Pageable pageable);
+
+    Optional<Board> findByIdAndUserIdAndIsCompletedIsFalse(Long boardId, Long userId);
 }

src/main/java/com/back/catchmate/domain/board/service/BoardService.java

@@ -19,5 +19,7 @@ public interface BoardService {
 
     PagedBoardInfo getBoardListByUserId(Long loginUserId, Long userId, Pageable pageable);
 
+    BoardInfo getTempBoard(Long userId, Long boardId);
+
     BoardDeleteInfo deleteBoard(Long userId, Long boardId);
 }

src/main/java/com/back/catchmate/domain/board/service/BoardServiceImpl.java

@@ -134,6 +134,22 @@ public PagedBoardInfo getBoardListByUserId(Long loginUserId, Long userId, Pageab
         return boardConverter.toPagedBoardInfoFromBoardList(boardList);
     }
 
+    @Override
+    @Transactional
+    public BoardInfo getTempBoard(Long userId, Long boardId) {
+        User user = userRepository.findById(userId)
+                .orElseThrow(() -> new BaseException(ErrorCode.USER_NOT_FOUND));
+
+        Board tempBoard = boardRepository.findByIdAndUserIdAndIsCompletedIsFalse(boardId, user.getId())
+                .orElseThrow(() -> new BaseException(ErrorCode.TEMP_BOARD_NOT_FOUND));
+
+        if (user.isDifferentUserFrom(tempBoard.getUser())) {
+            throw new BaseException(ErrorCode.TEMP_BOARD_BAD_REQUEST);
+        }
+
+        return boardConverter.toBoardInfo(tempBoard, tempBoard.getGame());
+    }
+
     @Override
     @Transactional
     public BoardDeleteInfo deleteBoard(Long userId, Long boardId) {

src/main/java/com/back/catchmate/global/error/ErrorCode.java

@@ -28,6 +28,8 @@ public enum ErrorCode {
 
     // 게시글
     BOARD_NOT_FOUND(HttpStatus.NOT_FOUND, "존재하지 않는 게시글입니다."),
+    TEMP_BOARD_NOT_FOUND(HttpStatus.NOT_FOUND, "임시 저장된 글이 존재하지 않습니다."),
+    TEMP_BOARD_BAD_REQUEST(HttpStatus.NOT_FOUND, "임시 저장된 글을 불러올 권한이 없습니다."),
     BOARD_DELETED(HttpStatus.NOT_FOUND, "삭제된 게시글이거나 잘못된 접근입니다."),
     BOARD_BAD_REQUEST(HttpStatus.BAD_REQUEST, "자신의 게시글만 수정할 수 있습니다."),
     INVALID_ACCESS_TOKEN(HttpStatus.UNAUTHORIZED, "유효하지 않은 액세스 토큰입니다."),