feat: 블로그 이름 중복 확인 기능

src/main/java/com/mallang/auth/config/AuthConfig.java

@@ -54,6 +54,7 @@ private AuthInterceptor setUpAuthInterceptor() {
                         .uriPatterns(Set.of(
                                 "/members/*",
                                 "/blogs",
+                                "/blogs/duplicate",
                                 "/posts/**",
                                 "/categories",
                                 "/comments",

src/main/java/com/mallang/blog/presentation/BlogController.java

@@ -5,8 +5,10 @@
 import com.mallang.blog.presentation.request.OpenBlogRequest;
 import com.mallang.blog.query.BlogQueryService;
 import com.mallang.blog.query.response.BlogResponse;
+import com.mallang.blog.query.response.CheckDuplicateResponse;
 import java.net.URI;
 import lombok.RequiredArgsConstructor;
+import org.springframework.data.repository.query.Param;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PostMapping;
@@ -45,4 +47,12 @@ public ResponseEntity<BlogResponse> findMyBlog(
     ) {
         return ResponseEntity.ok(blogQueryService.findByOwnerId(memberId));
     }
+
+    @GetMapping("/duplicate")
+    public ResponseEntity<CheckDuplicateResponse> checkDuplicate(
+            @Param("blogName") String blogName
+    ) {
+        boolean duplicated = blogQueryService.checkDuplicatedBlogName(blogName);
+        return ResponseEntity.ok(new CheckDuplicateResponse(duplicated));
+    }
 }

src/main/java/com/mallang/blog/query/BlogQueryService.java

@@ -24,4 +24,8 @@ public BlogResponse findByOwnerId(Long memberId) {
         Member member = memberQueryRepository.getById(memberId);
         return BlogResponse.from(blogQueryRepository.getByOwner(member));
     }
+
+    public boolean checkDuplicatedBlogName(String blogName) {
+        return blogQueryRepository.existsByName(blogName);
+    }
 }

src/main/java/com/mallang/blog/query/repository/BlogQueryRepository.java

@@ -38,4 +38,7 @@ default Blog getByOwner(Member owner) {
     }
 
     Optional<Blog> findByOwner(Member owner);
+
+    @Query("SELECT COUNT(b) > 0 FROM Blog b WHERE b.name.value = :blogName")
+    boolean existsByName(@Param("blogName") String blogName);
 }

src/main/java/com/mallang/blog/query/response/CheckDuplicateResponse.java

@@ -0,0 +1,6 @@
+package com.mallang.blog.query.response;
+
+public record CheckDuplicateResponse(
+        boolean duplicated
+) {
+}

src/test/java/com/mallang/acceptance/auth/MemberAcceptanceSteps.java

@@ -35,7 +35,6 @@ public class MemberAcceptanceSteps {
         return given(세션)
                 .get("/members/logout")
                 .then()
-                .log().all()
                 .extract();
     }
 

src/test/java/com/mallang/acceptance/auth/MemberAcceptanceTest.java

@@ -133,7 +133,6 @@ void setUp() {
         }
     }
 
-
     @Nested
     class 로그아웃_API {
 

src/test/java/com/mallang/acceptance/blog/BlogAcceptanceSteps.java

@@ -28,6 +28,14 @@ public class BlogAcceptanceSteps {
                 .extract();
     }
 
+    public static ExtractableResponse<Response> 블로그_이름_중복_확인_요청(String 이름) {
+        return given()
+                .queryParam("blogName", 이름)
+                .get("/blogs/duplicate")
+                .then()
+                .extract();
+    }
+
     public static ExtractableResponse<Response> 블로그_정보_조회_요청(String 블로그_이름) {
         return given()
                 .queryParam("blogName", 블로그_이름)

src/test/java/com/mallang/acceptance/blog/BlogAcceptanceTest.java

@@ -11,12 +11,14 @@
 import static com.mallang.acceptance.auth.AuthAcceptanceSteps.회원가입과_로그인_후_세션_ID_반환;
 import static com.mallang.acceptance.blog.BlogAcceptanceSteps.내_블로그_정보_조회_요청;
 import static com.mallang.acceptance.blog.BlogAcceptanceSteps.블로그_개설_요청;
+import static com.mallang.acceptance.blog.BlogAcceptanceSteps.블로그_이름_중복_확인_요청;
 import static com.mallang.acceptance.blog.BlogAcceptanceSteps.블로그_정보_조회_요청;
 import static org.assertj.core.api.Assertions.assertThat;
 
 import com.mallang.acceptance.AcceptanceTest;
 import com.mallang.blog.query.response.BlogResponse;
 import com.mallang.blog.query.response.BlogResponse.OwnerResponse;
+import com.mallang.blog.query.response.CheckDuplicateResponse;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.DisplayNameGeneration;
 import org.junit.jupiter.api.DisplayNameGenerator.ReplaceUnderscores;
@@ -29,7 +31,35 @@
 class BlogAcceptanceTest extends AcceptanceTest {
 
     @Nested
-    class 블로그_조회_API {
+    class 블로그_이름_중복_체크_API {
+
+        @Test
+        void 주어진_이름이_이미_사용중이면_중복됨() {
+            // given
+            var 말랑_세션_ID = 회원가입과_로그인_후_세션_ID_반환("말랑");
+            블로그_개설_요청(말랑_세션_ID, "mallang-blog");
+
+            // when
+            var 응답 = 블로그_이름_중복_확인_요청("mallang-blog");
+
+            // then
+            CheckDuplicateResponse response = 응답.as(CheckDuplicateResponse.class);
+            assertThat(response.duplicated()).isTrue();
+        }
+
+        @Test
+        void 주어진_이름이_사용중이지_않으면_중복되지_않음() {
+            // when
+            var 응답 = 블로그_이름_중복_확인_요청("mallang-blog");
+
+            // then
+            CheckDuplicateResponse response = 응답.as(CheckDuplicateResponse.class);
+            assertThat(response.duplicated()).isFalse();
+        }
+    }
+
+    @Nested
+    class 블로그_개설_API {
 
         @Test
         void 블로그를_개설한다() {