BE: [feat] 갤러리글 좋아요 누르기 CSID-DGU#83

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

@@ -4,6 +4,7 @@
 import RunningMachines.R2R.domain.crew.post.gallery.dto.GalleryPostDetailResponseDto;
 import RunningMachines.R2R.domain.crew.post.gallery.dto.GalleryPreviewResponseDto;
 import RunningMachines.R2R.domain.crew.post.gallery.service.GalleryPostCommandService;
+import RunningMachines.R2R.domain.crew.post.gallery.service.GalleryPostLikeService;
 import RunningMachines.R2R.domain.crew.post.gallery.service.GalleryPostQueryService;
 import RunningMachines.R2R.domain.crew.post.repository.CrewPostRepository;
 import lombok.RequiredArgsConstructor;
@@ -19,6 +20,7 @@
 public class GalleryPostController {
     private final GalleryPostCommandService galleryPostCommandService;
     private final GalleryPostQueryService galleryPostQueryService;
+    private final GalleryPostLikeService galleryPostLikeService;
 
     @PostMapping
     public ResponseEntity<Long> createGalleryPost(@PathVariable Long crewId, @RequestPart("content") GalleryPostCreateRequestDto contentDto, @RequestPart("images") List<MultipartFile> images) {
@@ -37,4 +39,10 @@ public ResponseEntity<GalleryPreviewResponseDto> getGalleryPreview(@PathVariable
         GalleryPreviewResponseDto responseDto = galleryPostQueryService.getGalleryPreview(crewId);
         return ResponseEntity.ok(responseDto);
     }
+
+    @PostMapping("/{crewPostId}/like")
+    public ResponseEntity<Void> likeGalleryPost(@PathVariable Long crewId, @PathVariable Long crewPostId) {
+        galleryPostLikeService.likeGalleryPost(crewId, crewPostId);
+        return ResponseEntity.ok().build();
+    }
 }

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

@@ -0,0 +1,51 @@
+package RunningMachines.R2R.domain.crew.post.gallery.service;
+
+import RunningMachines.R2R.domain.community.post.entity.Post;
+import RunningMachines.R2R.domain.community.post.repository.PostRepository;
+import RunningMachines.R2R.domain.crew.common.repository.CrewRepository;
+import RunningMachines.R2R.domain.crew.post.entity.CrewPost;
+import RunningMachines.R2R.domain.crew.post.entity.CrewPostLike;
+import RunningMachines.R2R.domain.crew.post.repository.CrewPostLikeRepository;
+import RunningMachines.R2R.domain.crew.post.repository.CrewPostRepository;
+import RunningMachines.R2R.domain.user.service.AuthCommandService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import RunningMachines.R2R.domain.user.entity.User;
+import RunningMachines.R2R.domain.crew.common.entity.Crew;
+
+@Service
+@RequiredArgsConstructor
+public class GalleryPostLikeService {
+    private final CrewPostRepository crewPostRepository;
+    private final CrewPostLikeRepository crewPostLikeRepository;
+    private final CrewRepository crewRepository;
+    private final AuthCommandService authCommandService;
+
+    @Transactional
+    public void likeGalleryPost(Long crewId, Long crewPostId) {
+        User currentUser = authCommandService.getCurrentUser();
+
+        CrewPost crewPost = crewPostRepository.findById(crewPostId)
+                .orElseThrow(() -> new IllegalArgumentException("게시글을 찾을 수 없습니다."));
+        Crew crew = crewRepository.findById(crewId)
+                .orElseThrow(() -> new IllegalArgumentException("크루를 찾을 수 없습니다."));
+
+        boolean isMemberOrLeader = crew.getCrewUsers().stream()
+                .anyMatch(crewUser -> crewUser.getUser().equals(currentUser));
+        if (!isMemberOrLeader) {
+            throw new IllegalArgumentException("좋아요는 크루 멤버만 누를 수 있습니다.");
+        }
+
+        boolean alreadyLiked = crewPostLikeRepository.existsByCrewPostAndUser(crewPost, currentUser);
+        if (alreadyLiked) {
+            throw new IllegalArgumentException("이미 좋아요를 눌렀습니다.");
+        }
+
+        CrewPostLike like = CrewPostLike.builder()
+                .crewPost(crewPost)
+                .user(currentUser)
+                .build();
+        crewPostLikeRepository.save(like);
+    }
+}

src/backend/src/main/java/RunningMachines/R2R/domain/crew/post/repository/CrewPostLikeRepository.java

@@ -0,0 +1,14 @@
+package RunningMachines.R2R.domain.crew.post.repository;
+
+import RunningMachines.R2R.domain.crew.post.entity.CrewPost;
+import RunningMachines.R2R.domain.user.entity.User;
+import org.springframework.data.jpa.repository.JpaRepository;
+import RunningMachines.R2R.domain.crew.post.entity.CrewPostLike;
+
+import java.util.Optional;
+
+public interface CrewPostLikeRepository extends JpaRepository<CrewPostLike, Integer> {
+    boolean existsByCrewPostAndUser(CrewPost crewPost, User user);
+
+    Optional<CrewPostLike> findByCrewPostAndUser(CrewPost crewPost, User user);
+}