refactor : 3차 세미나 실습 과제_CustomValidateException 이름 변경 #7

week02/seminar/demo/src/main/java/com/example/demo/common/dto/ErrorMessage.java

@@ -7,10 +7,13 @@
 @AllArgsConstructor
 @Getter
 public enum ErrorMessage {
+
   MEMBER_NOT_FOUND_BY_ID_EXCEPTION(HttpStatus.NOT_FOUND.value(), "ID에 해당하는 사용자가 존재하지 않습니다."),
   BLOG_NOT_FOUND(HttpStatus.NOT_FOUND.value(), "ID에 해당하는 블로그가 없습니다."),
   BLOG_UNAUTHORIZED(HttpStatus.NOT_FOUND.value(), "해당 블로그의 소유자가 아닙니다."),
+  POST_NOT_FOUND(HttpStatus.NOT_FOUND.value(), "ID에 해당하는 포스트가 없습니다."),
   ;
+
   private final int status;
   private final String message;
 }

week02/seminar/demo/src/main/java/com/example/demo/controller/PostController.java

@@ -3,28 +3,21 @@
 
 import com.example.demo.common.dto.SuccessMessage;
 import com.example.demo.common.dto.SuccessStatusResponse;
-import com.example.demo.domain.Blog;
-import com.example.demo.domain.Post;
-import com.example.demo.service.MemberService;
 import com.example.demo.service.PostService;
-import com.example.demo.service.dto.blog.BlogCreateRequest;
-import com.example.demo.service.dto.member.MemberCreateDto;
 import com.example.demo.service.dto.post.PostCreateRequest;
 import com.example.demo.service.dto.post.PostFindDto;
 import com.example.demo.service.dto.post.PostListFindDto;
 import jakarta.validation.Valid;
-import java.net.URI;
-import java.util.List;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.Mapping;
 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.RequestHeader;
 import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
 @RestController
@@ -62,4 +55,20 @@ public ResponseEntity<SuccessStatusResponse> findPostList(
     ));
 
   }
+
+  @GetMapping("post/{blogId}/{postId}")
+  public ResponseEntity<SuccessStatusResponse> findPost(
+      @RequestHeader(name = "memberId") Long memberId,
+      @PathVariable(name = "blogId") Long blogId,
+      @PathVariable(name = "postId") Long postId
+  ) {
+
+    PostFindDto post = postService.findPost(memberId, blogId, postId);
+
+    return ResponseEntity.ok(SuccessStatusResponse.of(
+        SuccessMessage.POST_FIND_SUCCESS,
+        post
+    ));
+
+  }
 }

week02/seminar/demo/src/main/java/com/example/demo/exception/CustomValidateException.java

@@ -0,0 +1,13 @@
+package com.example.demo.exception;
+
+import com.example.demo.common.dto.ErrorMessage;
+import lombok.Getter;
+
+@Getter
+public class CustomValidateException extends BusinessException {
+
+  public CustomValidateException(ErrorMessage errorMessage) {
+    super(errorMessage);
+  }
+
+}

week02/seminar/demo/src/main/java/com/example/demo/service/BlogService.java

@@ -4,7 +4,7 @@
 import com.example.demo.domain.Blog;
 import com.example.demo.domain.Member;
 import com.example.demo.exception.NotFoundException;
-import com.example.demo.exception.ValidateException;
+import com.example.demo.exception.CustomValidateException;
 import com.example.demo.repository.BlogRepository;
 import com.example.demo.service.dto.blog.BlogCreateRequest;
 import com.example.demo.service.dto.blog.BlogTitleUpdateRequest;
@@ -41,7 +41,7 @@ public void updateTitle(Long blogId, BlogTitleUpdateRequest blogTitleUpdateReque
 
   public void validateOwner(Long requestMemberId, Long findMemberId) {
     if (!requestMemberId.equals(findMemberId)) {
-      throw new ValidateException(ErrorMessage.BLOG_UNAUTHORIZED);
+      throw new CustomValidateException(ErrorMessage.BLOG_UNAUTHORIZED);
     }
   }
 }

week02/seminar/demo/src/main/java/com/example/demo/service/PostService.java

@@ -1,8 +1,10 @@
 package com.example.demo.service;
 
 
+import com.example.demo.common.dto.ErrorMessage;
 import com.example.demo.domain.Blog;
 import com.example.demo.domain.Post;
+import com.example.demo.exception.NotFoundException;
 import com.example.demo.repository.PostRepository;
 import com.example.demo.service.dto.post.PostCreateRequest;
 import com.example.demo.service.dto.post.PostFindDto;
@@ -45,4 +47,23 @@ public PostListFindDto findAllPost(Long memberId, Long blogId){
 
     return PostListFindDto.of(postRepository.findByBlog(blog));
   }
+
+  public Post findById(Long postId) {
+    return postRepository.findById(postId).orElseThrow(
+        () -> new NotFoundException(ErrorMessage.POST_NOT_FOUND)
+    );
+  }
+
+//  PostFindDto post = postService.findPost(memberId, blogId, postId);
+
+  public PostFindDto findPost(Long memberId, Long blogId, Long postId){
+    // blog 찾기
+    Blog blog = blogService.findById(blogId);
+    Long findMemberId = blog.getMember().getId();
+
+    // 요청한 사람이 블로그 소유주인지 확인
+    blogService.validateOwner(memberId, findMemberId);
+
+    return PostFindDto.of(findById(postId));
+  }
 }