댓글 API 구현

src/main/java/com/example/solidconnection/board/service/BoardService.java

@@ -9,12 +9,15 @@
 import com.example.solidconnection.type.BoardCode;
 import com.example.solidconnection.type.PostCategory;
 import lombok.RequiredArgsConstructor;
+import org.apache.commons.lang3.EnumUtils;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
 import java.util.List;
 import java.util.stream.Collectors;
 
+import static com.example.solidconnection.custom.exception.ErrorCode.INVALID_POST_CATEGORY;
+
 @Service
 @RequiredArgsConstructor
 public class BoardService {
@@ -28,12 +31,11 @@ private String validateCode(String code) {
         }
     }
 
-    private PostCategory validatePostCategory(String postCategory) {
-        try {
-            return PostCategory.valueOf(postCategory);
-        } catch (IllegalArgumentException ex) {
-            throw new CustomException(ErrorCode.INVALID_POST_CATEGORY);
+    private PostCategory validatePostCategory(String category){
+        if(!EnumUtils.isValidEnum(PostCategory.class, category)){
+            throw new CustomException(INVALID_POST_CATEGORY);
         }
+        return PostCategory.valueOf(category);
     }
 
     @Transactional(readOnly = true)

src/main/java/com/example/solidconnection/comment/controller/CommentController.java

@@ -0,0 +1,62 @@
+package com.example.solidconnection.comment.controller;
+
+import com.example.solidconnection.comment.dto.*;
+import com.example.solidconnection.comment.service.CommentService;
+import io.swagger.v3.oas.annotations.security.SecurityRequirement;
+import io.swagger.v3.oas.annotations.security.SecurityRequirements;
+import jakarta.validation.Valid;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.security.Principal;
+
+import static com.example.solidconnection.config.swagger.SwaggerConfig.ACCESS_TOKEN;
+
+@RestController
+@RequiredArgsConstructor
+@RequestMapping("/posts")
+@SecurityRequirements
+@SecurityRequirement(name = ACCESS_TOKEN)
+public class CommentController {
+
+    private final CommentService commentService;
+
+    @PostMapping("/{post_id}/comments")
+    public ResponseEntity<?> createComment(
+            Principal principal,
+            @PathVariable("post_id") Long postId,
+            @Valid @RequestBody CommentCreateRequest commentCreateRequest
+    ) {
+
+        CommentCreateResponse commentCreateResponse = commentService.createComment(
+                principal.getName(), postId, commentCreateRequest);
+        return ResponseEntity.ok().body(commentCreateResponse);
+    }
+
+    @PatchMapping("/{post_id}/comments/{comment_id}")
+    public ResponseEntity<?> updateComment(
+            Principal principal,
+            @PathVariable("post_id") Long postId,
+            @PathVariable("comment_id") Long commentId,
+            @Valid @RequestBody CommentUpdateRequest commentUpdateRequest
+    ) {
+
+        CommentUpdateResponse commentUpdateResponse = commentService.updateComment(
+                principal.getName(), postId, commentId, commentUpdateRequest
+        );
+        return ResponseEntity.ok().body(commentUpdateResponse);
+    }
+
+    @DeleteMapping("/{post_id}/comments/{comment_id}")
+    public ResponseEntity<?> deleteCommentById(
+            Principal principal,
+            @PathVariable("post_id") Long postId,
+            @PathVariable("comment_id") Long commentId
+    ) {
+
+        CommentDeleteResponse commentDeleteResponse = commentService.deleteCommentById(principal.getName(), postId, commentId);
+        return ResponseEntity.ok().body(commentDeleteResponse);
+    }
+
+}

src/main/java/com/example/solidconnection/comment/domain/Comment.java

@@ -0,0 +1,111 @@
+package com.example.solidconnection.comment.domain;
+
+import com.example.solidconnection.entity.common.BaseEntity;
+import com.example.solidconnection.post.domain.Post;
+import com.example.solidconnection.siteuser.domain.SiteUser;
+import jakarta.persistence.*;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Entity
+@Getter
+@NoArgsConstructor
+@EqualsAndHashCode(of = "id")
+public class Comment extends BaseEntity {
+
+    // for recursive query
+    @Transient
+    private int level;
+
+    @Transient
+    private String path;
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(length = 255)
+    private String content;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "post_id")
+    private Post post;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "site_user_id")
+    private SiteUser siteUser;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "parent_id")
+    private Comment parentComment;
+
+    @OneToMany(mappedBy = "parentComment", cascade = CascadeType.ALL)
+    private List<Comment> commentList = new ArrayList<>();
+
+    public Comment(String content) {
+        this.content = content;
+    }
+
+    public void setParentCommentAndPostAndSiteUser(Comment parentComment, Post post, SiteUser siteUser) {
+
+        if (this.parentComment != null) {
+            this.parentComment.getCommentList().remove(this);
+        }
+        this.parentComment = parentComment;
+        parentComment.getCommentList().add(this);
+
+        if (this.post != null) {
+            this.post.getCommentList().remove(this);
+        }
+        this.post = post;
+        post.getCommentList().add(this);
+
+        if (this.siteUser != null) {
+            this.siteUser.getCommentList().remove(this);
+        }
+        this.siteUser = siteUser;
+        siteUser.getCommentList().add(this);
+    }
+
+    public void setPostAndSiteUser(Post post, SiteUser siteUser) {
+
+        if (this.post != null) {
+            this.post.getCommentList().remove(this);
+        }
+        this.post = post;
+        post.getCommentList().add(this);
+
+        if (this.siteUser != null) {
+            this.siteUser.getCommentList().remove(this);
+        }
+        this.siteUser = siteUser;
+        siteUser.getCommentList().add(this);
+    }
+
+    public void resetPostAndSiteUserAndParentComment() {
+        if (this.post != null) {
+            this.post.getCommentList().remove(this);
+            this.post = null;
+        }
+        if (this.siteUser != null) {
+            this.siteUser.getCommentList().remove(this);
+            this.siteUser = null;
+        }
+        if (this.parentComment != null) {
+            this.parentComment.getCommentList().remove(this);
+            this.parentComment = null;
+        }
+    }
+
+    public void updateContent(String content) {
+        this.content = content;
+    }
+
+    public void deprecateComment() {
+        this.content = null;
+    }
+}

src/main/java/com/example/solidconnection/comment/dto/CommentCreateRequest.java

@@ -0,0 +1,39 @@
+package com.example.solidconnection.comment.dto;
+
+import com.example.solidconnection.comment.domain.Comment;
+import com.example.solidconnection.post.domain.Post;
+import com.example.solidconnection.siteuser.domain.SiteUser;
+import jakarta.annotation.Nullable;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
+import lombok.Getter;
+
+@Getter
+public class CommentCreateRequest {
+
+    @NotBlank(message = "댓글 내용은 빈 값일 수 없습니다.")
+    @Size(min = 1, max = 255, message = "댓글 내용은 최소 1자 이상, 최대 255자 이하여야 합니다.")
+    String content;
+
+    @Nullable
+    Long parentId;
+
+    public CommentCreateRequest(String content, @Nullable Long parentId) {
+        this.content = content;
+        this.parentId = parentId;
+    }
+
+    public Comment toEntity(SiteUser siteUser, Post post, Comment parentComment) {
+
+        Comment comment = new Comment(
+                this.content
+        );
+
+        if (parentComment == null) {
+            comment.setPostAndSiteUser(post, siteUser);
+        } else {
+            comment.setParentCommentAndPostAndSiteUser(parentComment, post, siteUser);
+        }
+        return comment;
+    }
+}

src/main/java/com/example/solidconnection/comment/dto/CommentCreateResponse.java

@@ -0,0 +1,14 @@
+package com.example.solidconnection.comment.dto;
+
+import com.example.solidconnection.comment.domain.Comment;
+
+public record CommentCreateResponse(
+        Long id
+) {
+
+    public static CommentCreateResponse from(Comment comment) {
+        return new CommentCreateResponse(
+                comment.getId()
+        );
+    }
+}

src/main/java/com/example/solidconnection/comment/dto/CommentDeleteResponse.java

@@ -0,0 +1,6 @@
+package com.example.solidconnection.comment.dto;
+
+public record CommentDeleteResponse(
+        Long id
+) {
+}

src/main/java/com/example/solidconnection/comment/dto/CommentUpdateRequest.java

@@ -0,0 +1,12 @@
+package com.example.solidconnection.comment.dto;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
+
+public record CommentUpdateRequest(
+        @NotBlank(message = "댓글 내용은 빈 값일 수 없습니다.")
+        @Size(min = 1, max = 255, message = "댓글 내용은 최소 1자 이상, 최대 255자 이하여야 합니다.")
+        String content
+) {
+
+}

src/main/java/com/example/solidconnection/comment/dto/CommentUpdateResponse.java

@@ -0,0 +1,14 @@
+package com.example.solidconnection.comment.dto;
+
+import com.example.solidconnection.comment.domain.Comment;
+
+public record CommentUpdateResponse(
+        Long id
+) {
+
+    public static CommentUpdateResponse from(Comment comment) {
+        return new CommentUpdateResponse(
+                comment.getId()
+        );
+    }
+}

src/main/java/com/example/solidconnection/comment/dto/PostFindCommentResponse.java

@@ -1,6 +1,6 @@
 package com.example.solidconnection.comment.dto;
 
-import com.example.solidconnection.entity.Comment;
+import com.example.solidconnection.comment.domain.Comment;
 import com.example.solidconnection.siteuser.dto.PostFindSiteUserResponse;
 
 import java.time.LocalDateTime;

src/main/java/com/example/solidconnection/comment/repository/CommentRepository.java

@@ -1,12 +1,14 @@
 package com.example.solidconnection.comment.repository;
 
-import com.example.solidconnection.entity.Comment;
+import com.example.solidconnection.comment.domain.Comment;
+import com.example.solidconnection.custom.exception.CustomException;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.query.Param;
 
 import java.util.List;
 
+import static com.example.solidconnection.custom.exception.ErrorCode.INVALID_COMMENT_ID;
 public interface CommentRepository extends JpaRepository<Comment, Long> {
 
     @Query(value = """
@@ -30,4 +32,8 @@ WITH RECURSIVE CommentTree AS (
             """, nativeQuery = true)
     List<Comment> findCommentTreeByPostId(@Param("postId") Long postId);
 
+    default Comment getById(Long id) {
+        return findById(id)
+                .orElseThrow(() -> new CustomException(INVALID_COMMENT_ID));
+    }
 }