[#63] 좋아요 생성/취소 기능 및 해당 게시물에 대한 좋아요 개수 기능 추가

src/main/java/com/prgrms/prolog/domain/like/api/LikeController.java

@@ -0,0 +1,47 @@
+package com.prgrms.prolog.domain.like.api;
+
+import java.net.URI;
+
+import javax.validation.Valid;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.util.UriComponentsBuilder;
+
+import com.prgrms.prolog.domain.like.dto.LikeDto;
+import com.prgrms.prolog.domain.like.dto.LikeDto.likeRequest;
+import com.prgrms.prolog.domain.like.service.LikeServiceImpl;
+import com.prgrms.prolog.global.jwt.JwtAuthentication;
+
+import lombok.RequiredArgsConstructor;
+
+@RestController
+@RequiredArgsConstructor
+@RequestMapping("/api/v1/like")
+public class LikeController {
+
+	private final LikeServiceImpl likeService;
+
+	@PostMapping(value = "/{postId}")
+	public ResponseEntity<Long> insert(
+		@PathVariable Long postId,
+		@AuthenticationPrincipal JwtAuthentication user
+	) {
+		LikeDto.likeRequest request = new likeRequest(user.id(), postId);
+		Long likeId = likeService.save(request);
+		URI location = UriComponentsBuilder.fromUriString("/api/v1/like/" + likeId).build().toUri();
+		return ResponseEntity.created(location).build();
+	}
+
+	@DeleteMapping
+	public ResponseEntity<Void> delete(@RequestBody @Valid likeRequest likeRequest) {
+		likeService.cancel(likeRequest);
+		return ResponseEntity.noContent().build();
+	}
+}

src/main/java/com/prgrms/prolog/domain/like/dto/LikeDto.java

@@ -0,0 +1,10 @@
+package com.prgrms.prolog.domain.like.dto;
+
+import javax.validation.constraints.NotNull;
+
+public class LikeDto {
+
+	public record likeRequest(@NotNull Long userId,
+							  @NotNull Long postId) {
+	}
+}

src/main/java/com/prgrms/prolog/domain/like/model/Like.java

@@ -0,0 +1,44 @@
+package com.prgrms.prolog.domain.like.model;
+
+import static javax.persistence.FetchType.*;
+import static javax.persistence.GenerationType.*;
+import static lombok.AccessLevel.*;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.JoinColumn;
+import javax.persistence.ManyToOne;
+import javax.persistence.Table;
+
+import com.prgrms.prolog.domain.post.model.Post;
+import com.prgrms.prolog.domain.user.model.User;
+
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Table(name = "likes")
+@Entity
+@Getter
+@NoArgsConstructor(access = PROTECTED)
+public class Like {
+
+	@Id
+	@GeneratedValue(strategy = IDENTITY)
+	private Long id;
+
+	@ManyToOne(fetch = LAZY)
+	@JoinColumn(name = "user_id")
+	private User user;
+
+	@ManyToOne(fetch = LAZY)
+	@JoinColumn(name = "post_id")
+	private Post post;
+
+	@Builder
+	public Like(User user, Post post) {
+		this.user = user;
+		this.post = post;
+	}
+}

src/main/java/com/prgrms/prolog/domain/like/repository/LikeRepository.java

@@ -0,0 +1,15 @@
+package com.prgrms.prolog.domain.like.repository;
+
+import java.util.Optional;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import com.prgrms.prolog.domain.like.model.Like;
+import com.prgrms.prolog.domain.post.model.Post;
+import com.prgrms.prolog.domain.user.model.User;
+
+@Repository
+public interface LikeRepository extends JpaRepository<Like, Long> {
+	Optional<Like> findByUserAndPost(User user, Post post);
+}

src/main/java/com/prgrms/prolog/domain/like/service/LikeService.java

@@ -0,0 +1,9 @@
+package com.prgrms.prolog.domain.like.service;
+
+import com.prgrms.prolog.domain.like.dto.LikeDto;
+
+public interface LikeService {
+	Long save(LikeDto.likeRequest likeRequest);
+
+	void cancel(LikeDto.likeRequest likeRequest);
+}

src/main/java/com/prgrms/prolog/domain/like/service/LikeServiceImpl.java

@@ -0,0 +1,73 @@
+package com.prgrms.prolog.domain.like.service;
+
+import javax.persistence.EntityNotFoundException;
+
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import com.prgrms.prolog.domain.like.dto.LikeDto.likeRequest;
+import com.prgrms.prolog.domain.like.model.Like;
+import com.prgrms.prolog.domain.like.repository.LikeRepository;
+import com.prgrms.prolog.domain.post.model.Post;
+import com.prgrms.prolog.domain.post.repository.PostRepository;
+import com.prgrms.prolog.domain.user.model.User;
+import com.prgrms.prolog.domain.user.repository.UserRepository;
+
+import lombok.RequiredArgsConstructor;
+
+@RequiredArgsConstructor
+@Transactional
+@Service
+public class LikeServiceImpl implements LikeService {
+
+	private final LikeRepository likeRepository;
+	private final UserRepository userRepository;
+	private final PostRepository postRepository;
+
+	@Override
+	public Long save(likeRequest likeRequest) {
+
+		User user = getFindUserBy(likeRequest.userId());
+		Post post = getFindPostBy(likeRequest.postId());
+
+		//TODO 이미 좋아요 되어있으면 에러 반환 -> 409 Conflict 오류로 변환
+		if (likeRepository.findByUserAndPost(user, post).isPresent()) {
+			throw new EntityNotFoundException("exception.like.alreadyExist");
+		}
+
+		Like like = likeRepository.save(saveLike(user, post));
+
+		postRepository.addLikeCount(post.getId());
+		return like.getId();
+	}
+
+	@Override
+	public void cancel(likeRequest likeRequest) {
+
+		User user = getFindUserBy(likeRequest.userId());
+		Post post = getFindPostBy(likeRequest.postId());
+
+		Like like = likeRepository.findByUserAndPost(user, post)
+			.orElseThrow(() -> new EntityNotFoundException("exception.like.notExist"));
+
+		likeRepository.delete(like);
+		postRepository.subLikeCount(post.getId());
+	}
+
+	private Like saveLike(User user, Post post) {
+		return Like.builder()
+			.user(user)
+			.post(post)
+			.build();
+	}
+
+	private User getFindUserBy(Long userId) {
+		return userRepository.findById(userId)
+			.orElseThrow(() -> new IllegalArgumentException("exception.user.notExists"));
+	}
+
+	private Post getFindPostBy(Long postId) {
+		return postRepository.findById(postId)
+			.orElseThrow(() -> new IllegalArgumentException("exception.post.notExists"));
+	}
+}

src/main/java/com/prgrms/prolog/domain/post/model/Post.java

@@ -9,6 +9,7 @@
 import java.util.Objects;
 import java.util.Set;
 
+import javax.persistence.Column;
 import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
 import javax.persistence.Id;
@@ -17,6 +18,7 @@
 import javax.persistence.ManyToOne;
 import javax.persistence.OneToMany;
 
+import org.hibernate.annotations.ColumnDefault;
 import org.springframework.util.Assert;
 
 import com.prgrms.prolog.domain.comment.model.Comment;
@@ -39,10 +41,6 @@ public class Post extends BaseEntity {
 	private static final int TITLE_MAX_SIZE = 50;
 	private static final int CONTENT_MAX_SIZE = 65535;
 
-	private static final String USER_INFO_NEED_MESSAGE = "게시글은 작성자 정보가 필요합니다.";
-	private static final String NOT_NULL_DATA_MESSAGE = "빈 값일 수 없는 데이터입니다.";
-	private static final String OVER_LENGTH_MESSAGE = "입력할 수 있는 범위를 초과하였습니다.";
-
 	@Id
 	@GeneratedValue(strategy = IDENTITY)
 	private Long id;
@@ -68,6 +66,10 @@ public class Post extends BaseEntity {
 	@JoinColumn(name = "series_id")
 	private Series series;
 
+	@ColumnDefault("0")
+	@Column(name = "like_count")
+	private int likeCount;
+
 	@Builder
 	public Post(String title, String content, boolean openStatus, User user, Series series) {
 		this.title = validateTitle(title);

src/main/java/com/prgrms/prolog/domain/post/repository/PostRepository.java

@@ -3,6 +3,7 @@
 import java.util.Optional;
 
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Modifying;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.query.Param;
 import org.springframework.stereotype.Repository;
@@ -27,4 +28,12 @@ public interface PostRepository extends JpaRepository<Post, Long> {
 		WHERE p.id = :postId
 		""")
 	Optional<Post> joinUserFindById(@Param(value = "postId") Long postId);
+
+	@Modifying
+	@Query("UPDATE Post p SET p.likeCount = p.likeCount + 1 WHERE p.id = :postId")
+	int addLikeCount(@Param(value = "postId") Long postId);
+
+	@Modifying
+	@Query("UPDATE Post p SET p.likeCount = p.likeCount - 1 WHERE p.id = :postId")
+	int subLikeCount(@Param(value = "postId") Long postId);
 }

src/main/java/com/prgrms/prolog/domain/post/service/PostService.java

@@ -8,8 +8,12 @@
 
 public interface PostService {
 	Long save(PostRequest.CreateRequest request, Long userId);
+
 	PostResponse findById(Long postId);
+
 	Page<PostResponse> findAll(Pageable pageable);
+
 	PostResponse update(PostRequest.UpdateRequest update, Long userId, Long postId);
+
 	void delete(Long id);
 }

src/main/java/com/prgrms/prolog/domain/post/service/PostServiceImpl.java

@@ -46,7 +46,6 @@ public class PostServiceImpl implements PostService {
 	private final PostTagRepository postTagRepository;
 	private final UserTagRepository userTagRepository;
 
-
 	@Override
 	@Transactional
 	public Long save(CreateRequest request, Long userId) {
@@ -66,10 +65,10 @@ private void registerSeries(CreateRequest request, Post post, User owner) {
 		Series series = seriesRepository
 			.findByIdAndTitle(owner.getId(), seriesTitle)
 			.orElseGet(() -> seriesRepository.save(
-						Series.builder()
-							.title(seriesTitle)
-							.user(owner)
-							.build()
+					Series.builder()
+						.title(seriesTitle)
+						.user(owner)
+						.build()
 				)
 			);
 		post.setSeries(series);
@@ -78,7 +77,7 @@ private void registerSeries(CreateRequest request, Post post, User owner) {
 	@Override
 	public PostResponse findById(Long postId) {
 		Post post = postRepository.joinCommentFindById(postId)
-			.orElseThrow(() -> new IllegalArgumentException(POST_NOT_EXIST_MESSAGE));
+			.orElseThrow(() -> new IllegalArgumentException("exception.post.notExists"));
 		Set<PostTag> findPostTags = postTagRepository.joinRootTagFindByPostId(postId);
 		post.addPostTagsFrom(findPostTags);
 		return PostResponse.toPostResponse(post);
@@ -94,7 +93,7 @@ public Page<PostResponse> findAll(Pageable pageable) {
 	@Transactional
 	public PostResponse update(UpdateRequest update, Long userId, Long postId) {
 		Post findPost = postRepository.joinUserFindById(postId)
-			.orElseThrow(() -> new IllegalArgumentException(POST_NOT_EXIST_MESSAGE));
+			.orElseThrow(() -> new IllegalArgumentException("exception.post.notExists"));
 
 		if (!findPost.getUser().checkSameUserId(userId)) {
 			throw new IllegalArgumentException("exception.post.not.owner");

src/main/java/com/prgrms/prolog/domain/user/dto/UserDto.java

@@ -6,7 +6,6 @@
 
 public class UserDto {
 
-	@Builder
 	public record UserProfile(
 		Long id,
 		String email,
@@ -15,6 +14,17 @@ public record UserProfile(
 		String prologName,
 		String profileImgUrl
 	) {
+		@Builder
+		public UserProfile(Long id, String email, String nickName, String introduce, String prologName,
+			String profileImgUrl) {
+			this.id = id;
+			this.email = email;
+			this.nickName = nickName;
+			this.introduce = introduce;
+			this.prologName = prologName;
+			this.profileImgUrl = profileImgUrl;
+		}
+
 		public static UserProfile toUserProfile(User user) {
 			return new UserProfile(
 				user.getId(),
@@ -27,15 +37,21 @@ public static UserProfile toUserProfile(User user) {
 		}
 	}
 
-	@Builder
 	public record UserInfo(
 		String email,
 		String nickName,
 		String provider,
 		String oauthId,
 		String profileImgUrl
 	) {
-
+		@Builder
+		public UserInfo(String email, String nickName, String provider, String oauthId, String profileImgUrl) {
+			this.email = email;
+			this.nickName = nickName;
+			this.provider = provider;
+			this.oauthId = oauthId;
+			this.profileImgUrl = profileImgUrl;
+		}
 	}
 
 	public record IdResponse(Long id) {

src/main/resources/db/migration/V2.2__add_like_table.sql

@@ -0,0 +1,12 @@
+DROP TABLE IF EXISTS likes;
+
+CREATE TABLE likes
+(
+    id      bigint NOT NULL PRIMARY KEY AUTO_INCREMENT,
+    user_id bigint NOT NULL,
+    post_id bigint NOT NULL,
+    FOREIGN KEY fk_likes_user_id (user_id) REFERENCES users (id),
+    FOREIGN KEY fk_likes_post_id (post_id) REFERENCES post (id)
+);
+
+ALTER TABLE post ADD like_count INT DEFAULT 0;