[#1]; refact : 4계층 적용

.github/ISSUE_TEMPLATE/refact_request.md

@@ -0,0 +1,16 @@
+---
+name: "Refact Report"
+about: 버그 리포트를 작성할 때 사용하는 템플릿입니다.
+title: "[REFACT] "
+labels: "refact"
+assignees: ''
+---
+
+### 🔬 재현 절차
+1. ...
+2. ...
+3. ...
+
+### 🤔 예상 결과
+### 💻 환경
+- **OS:** - **Browser:**

src/main/java/mission/post/application/PostController.java

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+package mission.post.application;
+
+import jakarta.validation.Valid;
+import lombok.RequiredArgsConstructor;
+import mission.post.business.PostService;
+import mission.post.application.dto.CreatePostRequest;
+import mission.post.application.dto.PostCreateResponse;
+import mission.post.application.dto.UpdatePostRequest;
+import mission.post.business.command.CreatePostCommand;
+import mission.post.business.command.UpdatePostCommand;
+import mission.post.business.result.PostResult;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.Map;
+
+@RestController
+@RequestMapping("/api/posts")
+@RequiredArgsConstructor
+public class PostController {
+    private final PostService postService;
+
+    @PostMapping
+    public PostCreateResponse create(@RequestBody @Valid CreatePostRequest req) {
+        var cmd = new CreatePostCommand(req.email(), req.password(), req.title(), req.content());
+        PostResult result = postService.create(cmd);
+        return new PostCreateResponse(result.articleId(), result.email(), result.title(), result.content());
+    }
+
+    @PutMapping("/{id}")
+    public PostCreateResponse update(@PathVariable Long id, @RequestBody @Valid UpdatePostRequest req) {
+        var cmd = new UpdatePostCommand(id, req.email(), req.password(), req.title(), req.content());
+        PostResult result = postService.update(cmd);
+        return new PostCreateResponse(result.articleId(), result.email(), result.title(), result.content());
+    }
+
+    @DeleteMapping("/{id}")
+    @ResponseStatus(HttpStatus.NO_CONTENT)
+    public void delete(@PathVariable Long id, @RequestBody Map<String, String> body) {
+        String email = body.get("email");
+        String password = body.get("password");
+        postService.delete(id, email, password);
+    }
+}

src/main/java/mission/post/dto/CreatePostRequest.java → src/main/java/mission/post/application/dto/CreatePostRequest.java

@@ -1,4 +1,4 @@
-package mission.post.dto;
+package mission.post.application.dto;
 
 import jakarta.validation.constraints.NotBlank;
 

src/main/java/mission/post/dto/PostCreateResponse.java → src/main/java/mission/post/application/dto/PostCreateResponse.java

@@ -1,4 +1,4 @@
-package mission.post.dto;
+package mission.post.application.dto;
 
 public record PostCreateResponse(
         Long articleId,

src/main/java/mission/post/dto/UpdatePostRequest.java → src/main/java/mission/post/application/dto/UpdatePostRequest.java

@@ -1,4 +1,4 @@
-package mission.post.dto;
+package mission.post.application.dto;
 
 import jakarta.validation.constraints.NotBlank;
 

src/main/java/mission/post/business/PostService.java

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+package mission.post.business;
+
+import jakarta.transaction.Transactional;
+import lombok.RequiredArgsConstructor;
+import mission.post.business.command.CreatePostCommand;
+import mission.post.business.command.UpdatePostCommand;
+import mission.post.business.result.PostResult;
+import mission.post.domain.Post;
+import mission.post.implement.PostReader;
+import mission.post.implement.PostWriter;
+import mission.user.domain.User;
+import mission.user.implement.AuthVerifier;
+import mission.user.implement.UserReader;
+import org.springframework.stereotype.Service;
+
+@Service
+@RequiredArgsConstructor
+public class PostService {
+    private final PostReader postReader;
+    private final PostWriter postWriter;
+    private final UserReader userReader;
+    private final AuthVerifier authVerifier;
+
+    @Transactional
+    public PostResult create(CreatePostCommand createPostCommand) {
+        User author = userReader.getByEmail(createPostCommand.email());
+        authVerifier.verifyUserEmailAndPassword(author, createPostCommand.email(), createPostCommand.password());
+
+        Post saved = postWriter.save(
+                Post.builder()
+                        .title(createPostCommand.title())
+                        .content(createPostCommand.content())
+                        .author(author)
+                        .build()
+        );
+
+        return new PostResult(saved.getId(), saved.getAuthor().getEmail(), saved.getTitle(), saved.getContent());
+    }
+
+    @Transactional
+    public PostResult update(UpdatePostCommand updatePostCommand) {
+        Post post = postReader.getById(updatePostCommand.id());
+        authVerifier.verifyUserEmailAndPassword(post.getAuthor(), updatePostCommand.email(), updatePostCommand.password());
+        post.edit(updatePostCommand.title(), updatePostCommand.content());
+
+        return new PostResult(
+                post.getId(),
+                post.getAuthor().getEmail(),
+                post.getTitle(),
+                post.getContent()
+        );
+    }
+    @Transactional
+    public void delete(Long id, String email, String password){
+        Post post = postReader.getById(id);
+
+        authVerifier.verifyUserEmailAndPassword(post.getAuthor(), email, password);
+
+        postWriter.delete(post);
+    }
+}

src/main/java/mission/post/business/command/CreatePostCommand.java

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+package mission.post.business.command;
+
+public record CreatePostCommand (
+    String email,
+    String password,
+    String title,
+    String content
+) {
+    public CreatePostCommand {
+        if (title == null || title.isBlank()) throw new IllegalArgumentException("title is null or empty");
+        if (content == null || content.isBlank()) throw new IllegalArgumentException("content is null or empty");
+    }
+}

src/main/java/mission/post/business/command/UpdatePostCommand.java

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+package mission.post.business.command;
+
+public record UpdatePostCommand(
+        Long id,
+        String email,
+        String password,
+        String title,
+        String content
+) {
+    public UpdatePostCommand{
+        if(id==null) throw new IllegalArgumentException("id is null");
+        if(title==null || title.isBlank()) throw new IllegalArgumentException("title is null or empty");
+        if(content==null || content.isBlank()) throw new IllegalArgumentException("content is null or empty");
+    }
+}

src/main/java/mission/post/business/result/PostResult.java

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+package mission.post.business.result;
+
+public record PostResult(
+        Long articleId,
+        String email,
+        String title,
+        String content
+) {
+}

src/main/java/mission/post/Post.java → src/main/java/mission/post/domain/Post.java

@@ -1,9 +1,9 @@
-package mission.post;
+package mission.post.domain;
 
 import jakarta.persistence.*;
 import jakarta.validation.constraints.NotBlank;
 import lombok.*;
-import mission.user.User;
+import mission.user.domain.User;
 
 @Entity
 @Table(name = "post")

src/main/java/mission/post/implement/PostReader.java

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+package mission.post.implement;
+
+
+import lombok.RequiredArgsConstructor;
+import mission.post.domain.Post;
+import mission.post.repository.PostRepository;
+import org.springframework.stereotype.Component;
+
+@Component
+@RequiredArgsConstructor
+public class PostReader {
+    private final PostRepository postRepository;
+
+    public Post getById(Long id) {
+        return postRepository.findById(id)
+                .orElseThrow(()->new IllegalArgumentException("post not found"));
+    }
+}

src/main/java/mission/post/implement/PostWriter.java

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+package mission.post.implement;
+
+import lombok.RequiredArgsConstructor;
+import mission.post.domain.Post;
+import mission.post.repository.PostRepository;
+import org.springframework.stereotype.Component;
+
+@Component
+@RequiredArgsConstructor
+public class PostWriter {
+    private final PostRepository postRepository;
+
+    public Post save(Post post){return postRepository.save(post);}
+    public void delete(Post post){postRepository.delete(post);}
+
+}

src/main/java/mission/post/PostRepository.java → src/main/java/mission/post/repository/PostRepository.java

@@ -1,5 +1,6 @@
-package mission.post;
+package mission.post.repository;
 
+import mission.post.domain.Post;
 import org.springframework.data.jpa.repository.JpaRepository;
 
 public interface PostRepository extends JpaRepository<Post, Long> {