Merge pull request #131 from CSID-DGU/backend/feature/crew

BE: [feat] 크루 갤러리 글 상세 조회 #83

src/backend/src/main/java/RunningMachines/R2R/domain/crew/post/gallery/controller/GalleryPostController.java

@@ -1,7 +1,9 @@
 package RunningMachines.R2R.domain.crew.post.gallery.controller;
 
 import RunningMachines.R2R.domain.crew.post.gallery.dto.GalleryPostCreateRequestDto;
+import RunningMachines.R2R.domain.crew.post.gallery.dto.GalleryPostDetailResponseDto;
 import RunningMachines.R2R.domain.crew.post.gallery.service.GalleryPostCommandService;
+import RunningMachines.R2R.domain.crew.post.gallery.service.GalleryPostQueryService;
 import RunningMachines.R2R.domain.crew.post.repository.CrewPostRepository;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.ResponseEntity;
@@ -15,10 +17,17 @@
 @RequiredArgsConstructor
 public class GalleryPostController {
     private final GalleryPostCommandService galleryPostCommandService;
+    private final GalleryPostQueryService galleryPostQueryService;
 
     @PostMapping
     public ResponseEntity<Long> createGalleryPost(@PathVariable Long crewId, @RequestPart("content") GalleryPostCreateRequestDto contentDto, @RequestPart("images") List<MultipartFile> images) {
         Long crewPostId = galleryPostCommandService.createGalleryPost(crewId, contentDto, images);
         return ResponseEntity.ok(crewPostId);
     }
+
+    @GetMapping("/{postId}")
+    public ResponseEntity<GalleryPostDetailResponseDto> getGalleryPost(@PathVariable Long crewId, @PathVariable Long postId) {
+        GalleryPostDetailResponseDto responseDto = galleryPostQueryService.getGalleryPostDetail(crewId, postId);
+        return ResponseEntity.ok(responseDto);
+    }
 }

src/backend/src/main/java/RunningMachines/R2R/domain/crew/post/gallery/dto/GalleryPostDetailResponseDto.java

@@ -0,0 +1,20 @@
+package RunningMachines.R2R.domain.crew.post.gallery.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+
+import java.util.List;
+
+@Getter
+@Builder
+@AllArgsConstructor
+public class GalleryPostDetailResponseDto {
+    private Long postId;
+    private String authorNickName;
+    private String authorProfileUrl;
+    private String createdAt;
+    private int likeCount;
+    private List<String> imageUrls;
+    private String content;
+}

src/backend/src/main/java/RunningMachines/R2R/domain/crew/post/gallery/service/GalleryPostQueryService.java

@@ -0,0 +1,43 @@
+package RunningMachines.R2R.domain.crew.post.gallery.service;
+
+import RunningMachines.R2R.domain.crew.board.entity.CrewBoard;
+import RunningMachines.R2R.domain.crew.post.entity.CrewPost;
+import RunningMachines.R2R.domain.crew.post.gallery.dto.GalleryPostDetailResponseDto;
+import RunningMachines.R2R.domain.crew.post.repository.CrewPostRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.stream.Collectors;
+
+@Service
+@RequiredArgsConstructor
+public class GalleryPostQueryService {
+    private final CrewPostRepository crewPostRepository;
+
+    @Transactional(readOnly = true)
+    public GalleryPostDetailResponseDto getGalleryPostDetail(Long crewId, Long crewPostId) {
+        CrewPost crewPost = crewPostRepository.findById(crewPostId)
+                .orElseThrow(() -> new IllegalArgumentException("해당 게시글을 찾을 수 없습니다."));
+
+        if (!crewPost.getCrew().getId().equals(crewId)) {
+            throw new IllegalArgumentException("요청한 크루에 해당하지 않는 게시글입니다.");
+        }
+
+        if (!CrewBoard.GALLERY.name().equals(crewPost.getBoard().name())) {
+            throw new IllegalArgumentException("갤러리 게시판의 글이 아닙니다.");
+        }
+
+        return GalleryPostDetailResponseDto.builder()
+                .postId(crewPost.getId())
+                .authorNickName(crewPost.getUser().getNickname())
+                .authorProfileUrl(crewPost.getUser().getProfileImageUrl())
+                .createdAt(crewPost.getCreatedAt().toString())
+                .likeCount(crewPost.getLikeCount())
+                .imageUrls(crewPost.getImages().stream()
+                        .map(image -> image.getImageUrl())
+                        .collect(Collectors.toList()))
+                .content(crewPost.getContent())
+                .build();
+    }
+}