Add article query

게시글 단건 조회 추가

src/main/java/com/yam/app/article/application/ArticleFacade.java

@@ -1,8 +1,11 @@
 package com.yam.app.article.application;
 
+import com.yam.app.article.domain.ArticleNotFoundException;
 import com.yam.app.article.domain.ArticleReader;
 import com.yam.app.article.domain.WriteArticleProcessor;
 import com.yam.app.article.presentation.ArticlePreviewResponse;
+import com.yam.app.article.presentation.ArticleResponse;
+import com.yam.app.article.presentation.TagResponse;
 import com.yam.app.article.presentation.WriteArticleCommand;
 import java.util.List;
 import java.util.stream.Collectors;
@@ -38,4 +41,26 @@ public class ArticleFacade {
                 dto.getStatus())
             ).collect(Collectors.toList());
     }
+
+    @Transactional(readOnly = true)
+    public ArticleResponse findById(Long articleId) {
+        var article = articleReader.findById(articleId).orElseThrow(
+            () -> new ArticleNotFoundException(articleId));
+
+        return ArticleResponse.builder()
+            .id(article.getId())
+            .authorId(article.getAuthorId())
+            .title(article.getTitle())
+            .content(article.getContent())
+            .image(article.getImage())
+            .createdAt(article.getCreatedAt())
+            .modifiedAt(article.getModifiedAt())
+            .tags(
+                article.getTags().stream()
+                    .map(a -> TagResponse.of(a.getTag().getId(), a.getTag().getName()))
+                    .collect(Collectors.toList())
+            )
+            .build();
+
+    }
 }

src/main/java/com/yam/app/article/presentation/ArticleQueryApi.java

@@ -5,6 +5,7 @@ import com.yam.app.common.ApiResult;
 import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
@@ -29,4 +30,9 @@ public final class ArticleQueryApi {
         return ResponseEntity.ok(
             ApiResult.success(articleFacade.findAll(offset, limit)));
     }
+
+    @GetMapping("/api/articles/{articleId}")
+    public ResponseEntity<ArticleResponse> showArticle(@PathVariable Long articleId) {
+        return ResponseEntity.ok(articleFacade.findById(articleId));
+    }
 }

src/main/java/com/yam/app/article/presentation/ArticleResponse.java

@@ -0,0 +1,34 @@
+package com.yam.app.article.presentation;
+
+import java.time.LocalDateTime;
+import java.util.List;
+import lombok.Builder;
+import lombok.Getter;
+
+@Getter
+@Builder
+public final class ArticleResponse {
+
+    private final Long id;
+    private final Long authorId;
+    private final String title;
+    private final String content;
+    private final String image;
+    private final LocalDateTime createdAt;
+    private final LocalDateTime modifiedAt;
+    private final List<TagResponse> tags;
+
+    private ArticleResponse(Long id, Long authorId, String title, String content, String image,
+        LocalDateTime createdAt, LocalDateTime modifiedAt,
+        List<TagResponse> tags) {
+        this.id = id;
+        this.authorId = authorId;
+        this.title = title;
+        this.content = content;
+        this.image = image;
+        this.createdAt = createdAt;
+        this.modifiedAt = modifiedAt;
+        this.tags = tags;
+    }
+
+}

src/main/java/com/yam/app/article/presentation/TagResponse.java

@@ -0,0 +1,20 @@
+package com.yam.app.article.presentation;
+
+import lombok.Getter;
+
+@Getter
+public final class TagResponse {
+
+    private final Long id;
+    private final String name;
+
+    private TagResponse(Long id, String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    public static TagResponse of(Long id, String name) {
+        return new TagResponse(id, name);
+    }
+
+}

src/test/java/com/yam/app/article/presentation/ArticleApiUri.java

@@ -4,6 +4,8 @@ public final class ArticleApiUri {
 
     public static final String WRITE_ARTICLE = "/api/articles/write";
     public static final String FIND_ALL = "/api/articles/all";
+    public static final String FIND_BY_ID = "/api/articles/";
 
-    private ArticleApiUri() {}
+    private ArticleApiUri() {
+    }
 }

src/test/java/com/yam/app/article/presentation/ArticleQueryApiTest.java

@@ -0,0 +1,45 @@
+package com.yam.app.article.presentation;
+
+import static com.yam.app.article.presentation.ArticleApiUri.FIND_BY_ID;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+import com.yam.app.article.application.ArticleFacade;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.http.MediaType;
+import org.springframework.test.context.ActiveProfiles;
+import org.springframework.test.web.servlet.MockMvc;
+
+@DisplayName("Article Qurey HTTP API")
+@WebMvcTest(ArticleQueryApi.class)
+@ActiveProfiles("test")
+class ArticleQueryApiTest {
+
+    @Autowired
+    private MockMvc mockMvc;
+    @MockBean
+    private ArticleFacade articleFacade;
+
+    @Test
+    @DisplayName("인증되지 않은 사용자가 게시글 조회 요청을 보냈다면 401에러를 반환한다.")
+    void unauthenticated_user_request() throws Exception {
+        //Act
+        final var actions = mockMvc.perform(get(FIND_BY_ID + 1)
+            .contentType(MediaType.APPLICATION_JSON)
+            .accept(MediaType.APPLICATION_JSON)
+        );
+
+        //Assert
+        actions
+            .andExpect(status().isUnauthorized())
+            .andExpect(jsonPath("$.success").value(false))
+            .andExpect(jsonPath("$.data").doesNotExist())
+            .andExpect(jsonPath("$.message").value("Unauthorized request"));
+
+    }
+}