🚀 좋아요 요청 및 취소 기능 작성

mysql/schema.sql

@@ -46,3 +46,19 @@ CREATE TABLE posts
     FOREIGN KEY (user_id)
         REFERENCES users (id)
 );
+
+CREATE TABLE likes
+(
+    id         BIGINT AUTO_INCREMENT,
+    user_id    BIGINT       NOT NULL,
+    post_id    BIGINT       NOT NULL,
+    status     TINYINT      NOT NULL,
+    created_at DATETIME(6)  NULL,
+    updated_at DATETIME(6)  NULL,
+    CONSTRAINT posts_pk
+        PRIMARY KEY (id),
+    FOREIGN KEY (user_id)
+        REFERENCES users (id),
+    FOREIGN KEY (post_id)
+        REFERENCES posts (id)
+);

src/main/java/com/backendoori/ootw/exception/ImageUploadException.java

@@ -5,7 +5,7 @@
 
 @Getter
 @RequiredArgsConstructor
-public class ImageUploadException extends RuntimeException{
+public class ImageUploadException extends RuntimeException {
 
     private final String message = "이미지 업로드 중 예외가 발생했습니다.";
 

src/main/java/com/backendoori/ootw/like/controller/LikeController.java

@@ -0,0 +1,29 @@
+package com.backendoori.ootw.like.controller;
+
+import com.backendoori.ootw.like.dto.controller.LikeRequest;
+import com.backendoori.ootw.like.dto.controller.LikeResponse;
+import com.backendoori.ootw.like.service.LikeService;
+import jakarta.validation.Valid;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.Authentication;
+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;
+
+@RestController
+@RequiredArgsConstructor
+@RequestMapping("/api/v1/likes")
+public class LikeController {
+
+    private final LikeService likeService;
+
+    @PostMapping
+    public ResponseEntity<LikeResponse> pushLike(Authentication authentication,
+                                                 @Valid @RequestBody LikeRequest requestDto) {
+        Long userId = (Long) authentication.getPrincipal();
+        return ResponseEntity.ok(likeService.requestLike(userId, requestDto.postId()));
+    }
+
+}

src/main/java/com/backendoori/ootw/like/domain/Like.java

@@ -0,0 +1,58 @@
+package com.backendoori.ootw.like.domain;
+
+import com.backendoori.ootw.common.BaseEntity;
+import com.backendoori.ootw.post.domain.Post;
+import com.backendoori.ootw.user.domain.User;
+import io.jsonwebtoken.lang.Assert;
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.Table;
+import lombok.AccessLevel;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Table(name = "likes")
+@Entity
+@Getter
+@Builder
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+public class Like extends BaseEntity {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "id")
+    private Long id;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "user_id", nullable = false)
+    private User user;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "post_id", nullable = false)
+    private Post post;
+
+    @Column(name = "status", columnDefinition = "tinyint")
+    private Boolean status;
+
+    private Like(Long id, User user, Post post, Boolean status) {
+        Assert.notNull(user);
+        Assert.notNull(post);
+        Assert.notNull(status);
+        this.id = id;
+        this.user = user;
+        this.post = post;
+        this.status = status;
+    }
+
+    public void updateStatus() {
+        this.status = !status;
+    }
+
+}

src/main/java/com/backendoori/ootw/like/dto/controller/LikeRequest.java

@@ -0,0 +1,15 @@
+package com.backendoori.ootw.like.dto.controller;
+
+import jakarta.validation.constraints.Min;
+import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Positive;
+
+public record LikeRequest(
+    @Positive
+    @NotNull(message = NULL_MESSAGE)
+    Long postId
+) {
+
+    private static final String NULL_MESSAGE = "반드시 postId 값이 null 입니다.";
+
+}

src/main/java/com/backendoori/ootw/like/dto/controller/LikeResponse.java

@@ -0,0 +1,20 @@
+package com.backendoori.ootw.like.dto.controller;
+
+import com.backendoori.ootw.like.domain.Like;
+
+public record LikeResponse(
+    Long likeId,
+    Long userId,
+    Long postId,
+    boolean status
+) {
+
+    public static LikeResponse from(Like like) {
+        return new LikeResponse(
+            like.getId(),
+            like.getUser().getId(),
+            like.getPost().getId(),
+            like.getStatus());
+    }
+
+}

src/main/java/com/backendoori/ootw/like/repository/LikeRepository.java

@@ -0,0 +1,13 @@
+package com.backendoori.ootw.like.repository;
+
+import java.util.Optional;
+import com.backendoori.ootw.like.domain.Like;
+import com.backendoori.ootw.post.domain.Post;
+import com.backendoori.ootw.user.domain.User;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface LikeRepository extends JpaRepository<Like, Long> {
+
+    Optional<Like> findByUserAndPost(User user, Post post);
+
+}

src/main/java/com/backendoori/ootw/like/service/LikeService.java

@@ -0,0 +1,59 @@
+package com.backendoori.ootw.like.service;
+
+import java.util.NoSuchElementException;
+import com.backendoori.ootw.exception.UserNotFoundException;
+import com.backendoori.ootw.like.domain.Like;
+import com.backendoori.ootw.like.dto.controller.LikeResponse;
+import com.backendoori.ootw.like.repository.LikeRepository;
+import com.backendoori.ootw.post.domain.Post;
+import com.backendoori.ootw.post.repository.PostRepository;
+import com.backendoori.ootw.user.domain.User;
+import com.backendoori.ootw.user.repository.UserRepository;
+import jakarta.transaction.Transactional;
+import lombok.RequiredArgsConstructor;
+import org.jetbrains.annotations.NotNull;
+import org.springframework.stereotype.Service;
+
+@Service
+@RequiredArgsConstructor
+public class LikeService {
+
+    private static final String POST_NOT_FOUND_MESSAGE = "해당 게시글이 존재하지 않습니다.";
+    private static final String LIKE_NOT_FOUND_MESSAGE = "찾으시는 좋아요 정보가 존재하지 않습니다.";
+
+    private final UserRepository userRepository;
+    private final PostRepository postRepository;
+    private final LikeRepository likeRepository;
+
+    @Transactional
+    public LikeResponse requestLike(Long userId, Long postId) {
+        User user = userRepository.findById(userId)
+            .orElseThrow(UserNotFoundException::new);
+
+        Post post = postRepository.findById(postId)
+            .orElseThrow(() -> new NoSuchElementException(POST_NOT_FOUND_MESSAGE));
+
+        likeRepository.findByUserAndPost(user, post).ifPresentOrElse(
+            Like::updateStatus,
+            likeNotExist(user, post)
+        );
+
+        Like like = likeRepository.findByUserAndPost(user, post)
+            .orElseThrow(() -> new NoSuchElementException(LIKE_NOT_FOUND_MESSAGE));
+
+        return LikeResponse.from(like);
+    }
+
+    @NotNull
+    private Runnable likeNotExist(User user, Post post) {
+        return () -> {
+            likeRepository.save(
+                Like.builder()
+                    .user(user)
+                    .post(post)
+                    .status(true)
+                    .build());
+        };
+    }
+
+}