게시글 좋아요 추가/제거

src/main/java/com/example/feeda/domain/post/controller/PostController.java

@@ -1,5 +1,6 @@
 package com.example.feeda.domain.post.controller;
 
+import com.example.feeda.domain.post.dto.PostLikeResponseDTO;
 import com.example.feeda.domain.post.dto.PostRequestDto;
 import com.example.feeda.domain.post.dto.PostResponseDto;
 import com.example.feeda.domain.post.service.PostService;
@@ -25,6 +26,7 @@
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
+
 @RestController
 @Validated
 @RequestMapping("/api/posts")
@@ -42,6 +44,26 @@ public ResponseEntity<PostResponseDto> createPost(@RequestBody PostRequestDto re
         return new ResponseEntity<>(post, HttpStatus.CREATED);
     }
 
+    @PostMapping("/{id}/likes")
+    public ResponseEntity<PostLikeResponseDTO> makeLikes(
+            @PathVariable Long id,
+            @AuthenticationPrincipal JwtPayload jwtPayload) {
+
+        Long profileId = jwtPayload.getProfileId();
+        return new ResponseEntity<>(postService.makeLikes(id, jwtPayload), HttpStatus.OK);
+    }
+
+    @DeleteMapping("/{id}/likes")
+    public ResponseEntity<Void> deleteLikes(
+            @PathVariable Long id,
+            @AuthenticationPrincipal JwtPayload jwtPayload
+    ) {
+        Long profileId = jwtPayload.getProfileId();
+        postService.deleteLikes(id, profileId);
+
+        return ResponseEntity.ok().build();
+    }
+
     @GetMapping("/{id}")
     public ResponseEntity<PostResponseDto> findPostById(@PathVariable @NotNull Long id) {
         return new ResponseEntity<>(postService.findPostById(id), HttpStatus.OK);

src/main/java/com/example/feeda/domain/post/dto/PostLikeResponseDTO.java

@@ -0,0 +1,22 @@
+package com.example.feeda.domain.post.dto;
+
+import com.example.feeda.domain.post.entity.PostLike;
+import lombok.Getter;
+
+import java.time.LocalDateTime;
+
+@Getter
+public class PostLikeResponseDTO {
+
+    private final Long id;
+    private final Long postId;
+    private final Long profileId;
+    private final LocalDateTime createdAt;
+
+    public PostLikeResponseDTO(PostLike postLike) {
+        this.id = postLike.getId();
+        this.postId = postLike.getPost().getId();
+        this.profileId = postLike.getProfile().getId();
+        this.createdAt = postLike.getCreatedAt();
+    }
+}

src/main/java/com/example/feeda/domain/post/dto/PostResponseDto.java

@@ -7,6 +7,8 @@
 import jakarta.persistence.Id;
 import lombok.Getter;
 
+import java.time.LocalDateTime;
+
 @Getter
 public class PostResponseDto {
 
@@ -18,14 +20,23 @@ public class PostResponseDto {
 
     private final String category;
 
-    public PostResponseDto(Long id, String title, String content, String category) {
-        this.id = id;
-        this.title = title;
-        this.content = content;
-        this.category = category;
+    private final Long likes;
+
+    private final LocalDateTime createdAt;
+
+    private final LocalDateTime updatedAt;
+
+    public PostResponseDto(Post post, Long likes) {
+        this.id = post.getId();
+        this.title = post.getTitle();
+        this.content = post.getContent();
+        this.category = post.getCategory();
+        this.likes = likes;
+        this.createdAt = post.getCreatedAt();
+        this.updatedAt = post.getUpdatedAt();
     }
 
-    public static PostResponseDto toDto(Post post) {
-        return new PostResponseDto(post.getId(), post.getTitle(), post.getContent(), post.getCategory());
+    public static PostResponseDto toDto(Post post, Long likes) {
+        return new PostResponseDto(post, likes);
     }
 }

src/main/java/com/example/feeda/domain/post/entity/Post.java

@@ -13,7 +13,6 @@
 import jakarta.validation.constraints.Size;
 import lombok.Getter;
 
-
 @Getter
 @Entity
 @Table(name = "posts")
@@ -39,21 +38,19 @@ public class Post extends BaseEntity {
     @JoinColumn(name = "profile_id")
     private Profile profile;
 
-    public Post(String title, String content, String category, Profile profile) {
+    public void update(String title, String content, String category) {
         this.title = title;
         this.content = content;
         this.category = category;
-        this.profile = profile;
     }
 
-    protected Post() {
-
-    }
-
-    public void update(String title, String content, String category) {
+    public Post(String title, String content, String category, Profile profile) {
         this.title = title;
         this.content = content;
         this.category = category;
+        this.profile = profile;
     }
 
+    protected Post() {
+    }
 }

src/main/java/com/example/feeda/domain/post/repository/PostLikeRepository.java

@@ -1,7 +1,13 @@
 package com.example.feeda.domain.post.repository;
 
+import com.example.feeda.domain.post.entity.Post;
 import com.example.feeda.domain.post.entity.PostLike;
+import com.example.feeda.domain.profile.entity.Profile;
 import org.springframework.data.jpa.repository.JpaRepository;
 
+import java.util.Optional;
+
 public interface PostLikeRepository extends JpaRepository<PostLike, Long> {
+    Optional<PostLike> findByPostAndProfile(Post post, Profile profile);
+    long countByPost(Post post); // PostLike 갯수
 }

src/main/java/com/example/feeda/domain/post/service/PostService.java

@@ -1,5 +1,6 @@
 package com.example.feeda.domain.post.service;
 
+import com.example.feeda.domain.post.dto.PostLikeResponseDTO;
 import com.example.feeda.domain.post.dto.PostRequestDto;
 import com.example.feeda.domain.post.dto.PostResponseDto;
 import com.example.feeda.security.jwt.JwtPayload;
@@ -8,7 +9,6 @@
 
 public interface PostService {
 
-
     PostResponseDto createPost(PostRequestDto postRequestDto,
         JwtPayload jwtPayload);
 
@@ -21,4 +21,9 @@ PostResponseDto createPost(PostRequestDto postRequestDto,
     PostResponseDto updatePost(Long id, PostRequestDto requestDto, JwtPayload jwtPayload);
 
     void deletePost(Long id, JwtPayload jwtPayload);
-}
+
+    PostLikeResponseDTO makeLikes(Long id, JwtPayload jwtPayload);
+
+    void deleteLikes(Long id, Long profileId);
+
+}

src/main/java/com/example/feeda/domain/post/service/PostServiceImpl.java

@@ -2,15 +2,20 @@
 
 import com.example.feeda.domain.follow.entity.Follows;
 import com.example.feeda.domain.follow.repository.FollowsRepository;
+import com.example.feeda.domain.post.dto.PostLikeResponseDTO;
 import com.example.feeda.domain.post.dto.PostRequestDto;
 import com.example.feeda.domain.post.dto.PostResponseDto;
 import com.example.feeda.domain.post.entity.Post;
+import com.example.feeda.domain.post.entity.PostLike;
+import com.example.feeda.domain.post.repository.PostLikeRepository;
 import com.example.feeda.domain.post.repository.PostRepository;
 import com.example.feeda.domain.profile.entity.Profile;
 import com.example.feeda.domain.profile.repository.ProfileRepository;
 import com.example.feeda.security.jwt.JwtPayload;
+
 import java.util.List;
 import java.util.Optional;
+
 import lombok.RequiredArgsConstructor;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.PageRequest;
@@ -21,30 +26,60 @@
 import org.springframework.transaction.annotation.Transactional;
 import org.springframework.web.server.ResponseStatusException;
 
+
 @Service
 @RequiredArgsConstructor
 public class PostServiceImpl implements PostService {
 
     private final PostRepository postRepository;
-    private final ProfileRepository profileRepository;
+    private final ProfileRepository profileRepository; // 현재 로그인 사용자 정보를 찾기 위해 필요
     private final FollowsRepository followsRepository;
+    private final PostLikeRepository postLikeRepository;
 
     @Override
     public PostResponseDto createPost(PostRequestDto postRequestDto, JwtPayload jwtPayload) {
 
         Profile profile = profileRepository.findById(jwtPayload.getProfileId())
-            .orElseThrow(
-                () -> new ResponseStatusException(HttpStatus.NOT_FOUND, "존재하지 않는 프로필입니다."));
+                .orElseThrow(
+                        () -> new ResponseStatusException(HttpStatus.NOT_FOUND, "존재하지 않는 프로필입니다."));
 
         Post post = new Post(postRequestDto.getTitle(), postRequestDto.getContent(),
-            postRequestDto.getCategory(), profile);
-        
+                postRequestDto.getCategory(), profile);
+
         Post savedPost = postRepository.save(post);
 
-        return new PostResponseDto(savedPost.getId(),
-            savedPost.getTitle(),
-            savedPost.getContent(),
-            savedPost.getCategory());
+        return new PostResponseDto(savedPost, 0L);
+    }
+
+    @Override
+    @Transactional
+    public PostLikeResponseDTO makeLikes(Long id, JwtPayload jwtPayload) {
+        Post post = postRepository.findById(id).orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND, "게시글이 존재하지 않습니다."));
+        Profile profile = profileRepository.findById(jwtPayload.getProfileId()).orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND, "프로필이 존재하지 않습니다."));
+        ;
+
+        // 중복 좋아요 방지
+        postLikeRepository.findByPostAndProfile(post, profile).ifPresent(like -> {
+            throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "이미 좋아요를 눌렀습니다.");
+        });
+
+        PostLike savePost = postLikeRepository.save(new PostLike(post, profile));
+
+        return new PostLikeResponseDTO(savePost);
+    }
+
+    @Override
+    public void deleteLikes(Long id, Long profileId) {
+        Post post = postRepository.findById(id)
+                .orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND, "게시글이 존재하지 않습니다."));
+
+        Profile profile = profileRepository.findById(profileId)
+                .orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND, "존재하지 않는 프로필"));
+
+        PostLike postLike = postLikeRepository.findByPostAndProfile(post, profile)
+                .orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND, "해당 사용자의 좋아요가 존재하지 않습니다."));
+
+        postLikeRepository.delete(postLike);
     }
 
     @Override
@@ -58,42 +93,43 @@ public PostResponseDto findPostById(Long id) {
 
         Post findPost = optionalPost.get();
 
-        return new PostResponseDto(id, findPost.getTitle(), findPost.getContent(),
-            findPost.getCategory());
+        Long likeCount = postLikeRepository.countByPost(findPost);
+
+        return new PostResponseDto(findPost, likeCount);
     }
 
     @Override
     @Transactional(readOnly = true)
     public Page<PostResponseDto> findAll(Pageable pageable, String keyword) {
 
         return postRepository.findAllByTitleContaining(keyword, pageable)
-            .map(PostResponseDto::toDto);
+                .map(post -> PostResponseDto.toDto(post, postLikeRepository.countByPost(post)));
     }
 
     @Override
     @Transactional(readOnly = true)
     public Page<PostResponseDto> findFollowingAllPost(Pageable pageable, JwtPayload jwtPayload) {
 
         Page<Follows> followings = followsRepository.findAllByFollowers_Id(
-            jwtPayload.getProfileId(), pageable);
+                jwtPayload.getProfileId(), pageable);
 
         List<Long> followingProfileIds = followings.stream()
-            .map(following -> following.getFollowings().getId())
-            .toList();
+                .map(following -> following.getFollowings().getId())
+                .toList();
 
         Pageable newPageable = PageRequest.of(pageable.getPageNumber(), pageable.getPageSize(),
-            Sort.Direction.DESC, "updatedAt");
+                Sort.Direction.DESC, "updatedAt");
 
         return postRepository.findAllByProfile_IdIn(followingProfileIds, newPageable)
-            .map(PostResponseDto::toDto);
+                .map(post -> PostResponseDto.toDto(post, postLikeRepository.countByPost(post)));
     }
 
     @Override
     @Transactional
     public PostResponseDto updatePost(Long id, PostRequestDto requestDto, JwtPayload jwtPayload) {
 
         Post findPost = postRepository.findById(id)
-            .orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND, "존재하지 않는 게시글"));
+                .orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND, "존재하지 않는 게시글"));
 
         if (!findPost.getProfile().getId().equals(jwtPayload.getProfileId())) {
             throw new ResponseStatusException(HttpStatus.FORBIDDEN, "권한이 없습니다.");
@@ -102,18 +138,17 @@ public PostResponseDto updatePost(Long id, PostRequestDto requestDto, JwtPayload
         findPost.update(requestDto.getTitle(), requestDto.getCategory(), requestDto.getCategory());
         Post savedPost = postRepository.save(findPost);
 
-        return new PostResponseDto(savedPost.getId(),
-            savedPost.getTitle(),
-            savedPost.getContent(),
-            savedPost.getCategory());
+        Long likeCount = postLikeRepository.countByPost(findPost);
+
+        return new PostResponseDto(savedPost, likeCount);
     }
 
     @Override
     @Transactional
     public void deletePost(Long id, JwtPayload jwtPayload) {
 
         Post findPost = postRepository.findById(id)
-            .orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND, "존재하지 않는 게시글"));
+                .orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND, "존재하지 않는 게시글"));
 
         if (!findPost.getProfile().getId().equals(jwtPayload.getProfileId())) {
             throw new ResponseStatusException(HttpStatus.FORBIDDEN, "권한이 없습니다.");