[3주차] 임현성/[feat] 팀 내 요구사항에 맞는 게시글 API 구축

src/main/java/com/leets/blog/controller/ApiControllerAdvice.java

@@ -0,0 +1,24 @@
+package com.leets.blog.controller;
+
+import com.leets.blog.support.error.PostException;
+import com.leets.blog.support.response.ApiResponse;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+@RestControllerAdvice
+public class ApiControllerAdvice {
+    private final Logger log = LoggerFactory.getLogger(getClass());
+
+    @ExceptionHandler(PostException.class)
+    public ResponseEntity<?> handlePostException(PostException e) {
+        switch (e.getErrorType().getLogLevel()) {
+            case ERROR -> log.error("PostException : {}", e.getMessage(), e);
+            case WARN -> log.warn("PostException : {}", e.getMessage(), e);
+            default -> log.info("PostException : {}", e.getMessage(), e);
+        }
+        return new ResponseEntity<>(ApiResponse.error(e.getErrorType(), e.getData()), e.getErrorType().getStatus());
+    }
+}

src/main/java/com/leets/blog/controller/v1/PostController.java

@@ -0,0 +1,50 @@
+package com.leets.blog.controller.v1;
+
+import com.leets.blog.dto.request.AddPostRequest;
+import com.leets.blog.dto.request.UpdatePostRequest;
+import com.leets.blog.dto.response.PostResponse;
+import com.leets.blog.service.PostService;
+import com.leets.blog.support.response.ApiResponse;
+import lombok.RequiredArgsConstructor;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/api/v1/posts")
+@RequiredArgsConstructor
+public class PostController {
+
+    private final PostService postService;
+
+    @GetMapping
+    public ApiResponse<List<PostResponse>> getPosts() {
+        List<PostResponse> result = postService.getPosts();
+        return ApiResponse.success(result);
+    }
+
+    @GetMapping("/{postId}")
+    public ApiResponse<PostResponse> getPostByPostId(@PathVariable Long postId) {
+        PostResponse result = postService.getPostByPostId(postId);
+        return ApiResponse.success(result);
+    }
+
+    @PostMapping
+    public ApiResponse<PostResponse> writePost(@RequestBody AddPostRequest request) {
+        PostResponse result = postService.addPost(request);
+        return ApiResponse.success(result);
+    }
+
+    @PutMapping("/{postId}")
+    public ApiResponse<PostResponse> reWritePost(@PathVariable Long postId, @RequestBody UpdatePostRequest request) {
+        PostResponse result = postService.updatePost(postId, request);
+        return ApiResponse.success(result);
+    }
+
+    @DeleteMapping("/{postId}")
+    public ApiResponse<?> deletePost(@PathVariable Long postId) {
+        postService.deletePost(postId);
+        return ApiResponse.success();
+    }
+
+}

src/main/java/com/leets/blog/controller/v1/TestController.java

@@ -1,7 +1,7 @@
 package com.leets.blog.controller.v1;
 
-import com.leets.blog.dto.StringRequest;
-import com.leets.blog.dto.StringResponse;
+import com.leets.blog.dto.request.StringRequest;
+import com.leets.blog.dto.response.StringResponse;
 import com.leets.blog.service.DtoConverter;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestBody;

src/main/java/com/leets/blog/dto/request/AddPostRequest.java

@@ -0,0 +1,21 @@
+package com.leets.blog.dto.request;
+
+import com.leets.blog.support.error.ErrorType;
+import com.leets.blog.support.error.PostException;
+
+public record AddPostRequest(
+        String title,
+        String content
+) {
+    public AddPostRequest {
+        // 제목이 10자를 초과할 경우 예외 발생
+        if (title == null || title.length() < 10) {
+            throw new PostException(ErrorType.INVALID_EXCEPTION);
+        }
+
+        // 내용이 비어있는지 확인하는 추가 검증
+        if (content == null || content.isBlank()) {
+            throw new PostException(ErrorType.INVALID_EXCEPTION);
+        }
+    }
+}

src/main/java/com/leets/blog/dto/StringRequest.java → src/main/java/com/leets/blog/dto/request/StringRequest.java

@@ -1,4 +1,4 @@
-package com.leets.blog.dto;
+package com.leets.blog.dto.request;
 
 public record StringRequest(
         String string

src/main/java/com/leets/blog/dto/request/UpdatePostRequest.java

@@ -0,0 +1,21 @@
+package com.leets.blog.dto.request;
+
+import com.leets.blog.support.error.ErrorType;
+import com.leets.blog.support.error.PostException;
+
+public record UpdatePostRequest(
+        String title,
+        String content
+) {
+    public UpdatePostRequest {
+        // 제목이 10자를 초과할 경우 예외 발생
+        if (title != null && title.length() > 10) {
+            throw new PostException(ErrorType.INVALID_EXCEPTION);
+        }
+
+        // 내용이 비어있는지 확인하는 추가 검증
+        if (content == null || content.isBlank()) {
+            throw new PostException(ErrorType.INVALID_EXCEPTION);
+        }
+    }
+}

src/main/java/com/leets/blog/dto/response/PostResponse.java

@@ -0,0 +1,8 @@
+package com.leets.blog.dto.response;
+
+public record PostResponse(
+        Long postId,
+        String title,
+        String content
+) {
+}

src/main/java/com/leets/blog/dto/StringResponse.java → src/main/java/com/leets/blog/dto/response/StringResponse.java

@@ -1,4 +1,4 @@
-package com.leets.blog.dto;
+package com.leets.blog.dto.response;
 
 public record StringResponse(
         String string_one,

src/main/java/com/leets/blog/entity/Post.java

@@ -1,13 +1,15 @@
 package com.leets.blog.entity;
 
 import jakarta.persistence.*;
+import lombok.Getter;
 
 import java.time.LocalDateTime;
 import java.util.ArrayList;
 import java.util.List;
 
 @Entity
 @Table(name = "post")
+@Getter
 public class Post {
 
     public Post() {}
@@ -39,4 +41,12 @@ public Post(String title, String content) {
     // Post는 여러 개의 Comment와 연결됨 (1:N)
     @OneToMany(mappedBy = "post", cascade = CascadeType.ALL, orphanRemoval = true)
     private List<Comment> comments = new ArrayList<>();
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public void setContent(String content) {
+        this.content = content;
+    }
 }

src/main/java/com/leets/blog/repository/CommentRepository.java

@@ -0,0 +1,9 @@
+package com.leets.blog.repository;
+
+import com.leets.blog.entity.Comment;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface CommentRepository extends JpaRepository<Comment, Long> {
+}

src/main/java/com/leets/blog/repository/PostRepository.java

@@ -0,0 +1,9 @@
+package com.leets.blog.repository;
+
+import com.leets.blog.entity.Post;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface PostRepository extends JpaRepository<Post, Long> {
+}

src/main/java/com/leets/blog/repository/UserRepository.java

@@ -0,0 +1,9 @@
+package com.leets.blog.repository;
+
+import com.leets.blog.entity.User;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface UserRepository extends JpaRepository<User, Long> {
+}

src/main/java/com/leets/blog/service/DtoConverter.java

@@ -1,15 +1,41 @@
 package com.leets.blog.service;
 
-import com.leets.blog.dto.StringRequest;
-import com.leets.blog.dto.StringResponse;
-import org.springframework.stereotype.Service;
+import com.leets.blog.dto.response.StringResponse;
+import com.leets.blog.dto.request.AddPostRequest;
+import com.leets.blog.dto.request.UpdatePostRequest;
+import com.leets.blog.dto.response.PostResponse;
+import com.leets.blog.entity.Post;
+import org.springframework.stereotype.Component;
 
-@Service
+@Component
 public class DtoConverter {
 
     // NOTE : StringRequest -> StringResponse
     public StringResponse convert(String string) {
         return new StringResponse(string, string);
     }
 
+    public Post toPost(AddPostRequest request) {
+        return new Post(
+                request.title(),
+                request.content()
+        );
+    }
+
+    public Post toPost(UpdatePostRequest request) {
+        return new Post(
+                request.title(),
+                request.content()
+        );
+    }
+
+    public PostResponse toDTO(Post post) {
+        return new PostResponse(
+                post.getId(),
+                post.getTitle(),
+                post.getContent()
+        );
+    }
+
+
 }

src/main/java/com/leets/blog/service/PostFinder.java

@@ -0,0 +1,34 @@
+package com.leets.blog.service;
+
+import com.leets.blog.entity.Post;
+import com.leets.blog.repository.PostRepository;
+import com.leets.blog.support.error.ErrorType;
+import com.leets.blog.support.error.PostException;
+import org.springframework.stereotype.Component;
+
+import java.util.List;
+
+@Component
+public class PostFinder {
+
+    private final PostRepository postRepository;
+
+    public PostFinder(PostRepository postRepository) {
+        this.postRepository = postRepository;
+    }
+
+    public List<Post> findPosts() {
+        List<Post> posts = postRepository.findAll();
+
+        if (posts.isEmpty()) {
+            throw new PostException(ErrorType.NOT_EXIST_POST);
+        }
+
+        return posts;
+    }
+
+    public Post findPostByPostId(Long postId) {
+        return postRepository.findById(postId)
+                .orElseThrow(() -> new PostException(ErrorType.NOT_FOUND_POST));
+    }
+}

src/main/java/com/leets/blog/service/PostManager.java

@@ -0,0 +1,39 @@
+package com.leets.blog.service;
+
+import com.leets.blog.entity.Post;
+import com.leets.blog.repository.PostRepository;
+import org.springframework.stereotype.Component;
+import org.springframework.transaction.annotation.Transactional;
+
+@Component
+public class PostManager {
+
+    private final PostRepository postRepository;
+
+    public PostManager(PostRepository postRepository) {
+        this.postRepository = postRepository;
+    }
+
+    @Transactional
+    public Post add (Post post) {
+        return postRepository.save(post);
+    }
+
+    // NOTE : userId 제외
+    @Transactional
+    public Post update (Long postId, Post post) {
+
+        Post savedPost = postRepository.findById(postId).orElseThrow(RuntimeException::new);
+
+        savedPost.setTitle(post.getTitle());
+        savedPost.setContent(post.getContent());
+
+        return savedPost;
+    }
+
+    // NOTE : userId 제외
+    @Transactional
+    public void delete (Long postId) {
+        postRepository.deleteById(postId);
+    }
+}