feat: 상세 게시글 조회 API 구현 (#116)

* refactor: 게시글 관련 repository 파일 패키징 변경

* refactor: 게시판 이름 가져오는 로직 추출

* feat: 게시글 이미지 데이터 문자열로 변환하는 로직 구현

* feat: 상세 게시글 dto 정의

* feat: 상세 게시글 조회 서비스 로직 구현

* feat: 상세 게시글 조회 API 구현

* test: 상세 게시글 조회 서비스 로직, api 테스트 케이스 작성

Author: SeungGun

src/main/java/com/flint/flint/community/controller/PostGetController.java

@@ -1,15 +1,16 @@
 package com.flint.flint.community.controller;
 
 import com.flint.flint.common.ResponseForm;
+import com.flint.flint.community.dto.response.DetailPostResponse;
 import com.flint.flint.community.dto.response.PostResponse;
 import com.flint.flint.community.service.PostGetService;
+import com.flint.flint.security.auth.dto.AuthorityMemberDTO;
 import lombok.RequiredArgsConstructor;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.web.PageableDefault;
-import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RequestParam;
-import org.springframework.web.bind.annotation.RestController;
+import org.springframework.security.access.prepost.PreAuthorize;
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.web.bind.annotation.*;
 
 import java.util.List;
 
@@ -43,4 +44,20 @@ public ResponseForm<List<PostResponse>> searchInSpecificBoard(@RequestParam Stri
                                                                   @PageableDefault(size = 10) Pageable pageable) {
         return new ResponseForm<>(postGetService.searchInSpecificBoard(boardName, keyword, pageable));
     }
+
+    /**
+     * 게시물 상세 조회
+     *
+     * @param memberDTO 조회 유저
+     * @param postId    조회할 게시글 ID
+     * @return 게시글 관련 모든 메타데이터 및 데이터 정보
+     */
+    @PreAuthorize("isAuthenticated()")
+    @GetMapping("/{postId}")
+    public ResponseForm<DetailPostResponse> getDetailPost(
+            @AuthenticationPrincipal AuthorityMemberDTO memberDTO,
+            @PathVariable("postId") Long postId
+    ) {
+        return new ResponseForm<>(postGetService.getDetailPost(postId));
+    }
 }

src/main/java/com/flint/flint/community/domain/post/Post.java

@@ -70,4 +70,10 @@ public void addPostLike(PostLike postLike) {
         this.postLikes.add(postLike);
         postLike.changePost(this);
     }
+
+    public List<String> convertImagesToString() {
+        return this.postImages.stream()
+                .map(PostImage::getImgUrl)
+                .toList();
+    }
 }

src/main/java/com/flint/flint/community/dto/response/DetailPostResponse.java

@@ -0,0 +1,26 @@
+package com.flint.flint.community.dto.response;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.time.LocalDateTime;
+import java.util.List;
+
+@Data
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class DetailPostResponse {
+    private Long postId;
+    private String boardName;
+    private WriterResponse writer;
+    private String title;
+    private String contents;
+    private LocalDateTime createAt;
+    private int likeCount;
+    private int scrapCount;
+    private int commentCount;
+    private List<String> images;
+}

src/main/java/com/flint/flint/community/dto/response/WriterResponse.java

@@ -0,0 +1,17 @@
+package com.flint.flint.community.dto.response;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class WriterResponse {
+    private Long memberId;
+    private String universityLogoUrl;
+    private String universityName;
+    private String major;
+}

src/main/java/com/flint/flint/community/repository/PostRepositoryCustom.java

@@ -1,9 +1,7 @@
-package com.flint.flint.community.repository;
+package com.flint.flint.community.repository.post;
 
 import com.flint.flint.community.domain.post.Post;
-import com.flint.flint.community.repository.custom.PostRepositoryCustom;
 import org.springframework.data.jpa.repository.JpaRepository;
 
-
 public interface PostRepository extends JpaRepository<Post, Long>, PostRepositoryCustom {
 }

src/main/java/com/flint/flint/community/repository/impl/PostRepositoryImpl.java

@@ -1,15 +1,15 @@
-package com.flint.flint.community.repository.custom;
+package com.flint.flint.community.repository.post;
 
 import com.flint.flint.community.domain.post.Post;
+import com.flint.flint.community.dto.response.PostListResponse;
+import com.flint.flint.community.spec.SortStrategy;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
 
+import java.util.List;
 
-/**
- * @author 정순원
- * @since 2023-11-06
- */
 public interface PostRepositoryCustom {
+    List<PostListResponse> findPostsWithBoardByPaging(Long boardId, Post cursorPost, Long size, SortStrategy sort);
 
     /**
      * 전체게시판에서

src/main/java/com/flint/flint/community/repository/PostRepository.java renamed to src/main/java/com/flint/flint/community/repository/post/PostRepository.java

@@ -1,11 +1,15 @@
-package com.flint.flint.community.repository;
+package com.flint.flint.community.repository.post;
 
 import com.flint.flint.community.domain.post.Post;
 import com.flint.flint.community.dto.response.PostListResponse;
 import com.flint.flint.community.spec.SortStrategy;
 import com.querydsl.core.types.*;
+import com.querydsl.core.types.dsl.BooleanExpression;
 import com.querydsl.jpa.impl.JPAQueryFactory;
 import lombok.RequiredArgsConstructor;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageImpl;
+import org.springframework.data.domain.Pageable;
 
 import java.util.List;
 import java.util.Optional;
@@ -41,8 +45,50 @@ public List<PostListResponse> findPostsWithBoardByPaging(Long boardId, Post curs
                 .toList();
     }
 
+    /**
+     * 전체게시판에서
+     * 제목이나 내용에 키워드가 포함된 글 최신순으로 가져오기
+     */
+    @Override
+    public Page<Post> findByTitleOrContentsContaining(String keyword, Pageable pageable) {
+        List<Post> posts = queryFactory.selectFrom(post)
+                .where(containsTitleOrContent(keyword))
+                .orderBy(post.createdAt.desc())
+                .offset(pageable.getOffset())
+                .limit(pageable.getPageSize())
+                .fetch();
+
+        return new PageImpl<>(posts, pageable, posts.size());
+    }
+
+
+    /**
+     * 특정 게시판에서
+     * 제목이나 내용에 키워드가 포함된 글 최신순으로 가져오기
+     */
+    @Override
+    public Page<Post> findByTitleOrContentsContainingAndBoard(long boardId, String keyword, Pageable pageable) {
+
+        List<Post> posts = queryFactory.selectFrom(post)
+                .where(containsTitleOrContent(keyword).and(isBoard(boardId)))
+                .orderBy(post.createdAt.desc())
+                .offset(pageable.getOffset())
+                .limit(pageable.getPageSize())
+                .fetch();
+
+        return new PageImpl<>(posts, pageable, posts.size());
+    }
+
+    private BooleanExpression containsTitleOrContent(String keyword) {
+        return post.title.contains(keyword).or(post.contents.contains(keyword));
+    }
+
+    private BooleanExpression isBoard(Long boardId) {
+        return post.board.id.eq(boardId);
+    }
+
     private Predicate filterBoard(Long boardId) {
-        return Optional.of(boardId)
+        return Optional.ofNullable(boardId)
                 .map(post.board.id::eq)
                 .orElse(null);
     }

src/main/java/com/flint/flint/community/repository/custom/PostRepositoryCustom.java renamed to src/main/java/com/flint/flint/community/repository/post/PostRepositoryCustom.java

@@ -1,4 +1,4 @@
-package com.flint.flint.community.repository;
+package com.flint.flint.community.repository.post_comment;
 
 import com.flint.flint.community.domain.post.PostComment;
 import org.springframework.data.jpa.repository.JpaRepository;