[feat] 콘텐츠 찜(북마크) 수 조회 api 구현

backend/turip-app/src/main/java/turip/favorite/controller/FavoriteContentController.java

@@ -23,6 +23,7 @@
 import turip.common.exception.ErrorResponse;
 import turip.content.controller.dto.response.content.ContentsDetailWithLoadableResponse;
 import turip.favorite.controller.dto.request.FavoriteContentRequest;
+import turip.favorite.controller.dto.response.FavoriteContentCountResponse;
 import turip.favorite.controller.dto.response.FavoriteContentResponse;
 import turip.favorite.service.FavoriteContentService;
 
@@ -261,6 +262,76 @@ public ResponseEntity<ContentsDetailWithLoadableResponse> readMyFavoriteContents
         return ResponseEntity.ok(response);
     }
 
+    @Operation(
+            summary = "내 콘텐츠 찜(북마크) 수 조회 api",
+            description = "콘텐츠 찜(북마크)이 몇 개인지 반환한다."
+    )
+    @ApiResponses(value = {
+            @ApiResponse(
+                    responseCode = "200",
+                    description = "성공 예시",
+                    content = @Content(
+                            mediaType = "application/json",
+                            schema = @Schema(implementation = FavoriteContentCountResponse.class),
+                            examples = @ExampleObject(
+                                    name = "success",
+                                    summary = "북마크 수 조회 성공",
+                                    value = """
+                                            {
+                                                "count": 13
+                                            }
+                                            """
+                            )
+                    )
+            ),
+            @ApiResponse(
+                    responseCode = "401",
+                    description = "실패 예시",
+                    content = @Content(
+                            mediaType = "application/json",
+                            schema = @Schema(implementation = ErrorResponse.class),
+                            examples = {
+                                    @ExampleObject(
+                                            name = "access token expired",
+                                            summary = "만료된 access token",
+                                            value = """
+                                                    {
+                                                    	"tag": "ACCESS_TOKEN_EXPIRED",
+                                                    	"message": "access token이 만료됐습니다."
+                                                    }
+                                                    """
+                                    ),
+                                    @ExampleObject(
+                                            name = "invalid signature access token",
+                                            summary = "서명값이 올바르지 않은 access token",
+                                            value = """
+                                                    {
+                                                    	"tag": "ACCESS_TOKEN_SIGNATURE_INVALID",
+                                                    	"message": "access token이 위조됐습니다."
+                                                    }
+                                                    """
+                                    ),
+                                    @ExampleObject(
+                                            name = "unauthorized",
+                                            summary = "알 수 없는 이유로 인증 실패",
+                                            value = """
+                                                    {
+                                                    	"tag": "UNAUTHORIZED",
+                                                    	"message": "토큰 기반 인증에 실패했습니다."
+                                                    }
+                                                    """
+                                    )
+                            }
+                    )
+            )
+    })
+    @GetMapping("/count")
+    public ResponseEntity<FavoriteContentCountResponse> readBookmarkCount(
+            @Parameter(hidden = true) @AuthAccount Account account) {
+        FavoriteContentCountResponse response = favoriteContentService.countByAccount(account);
+        return ResponseEntity.ok(response);
+    }
+
     @Operation(
             summary = "북마크 삭제 api",
             description = "컨텐츠 북마크를 취소한다."

backend/turip-app/src/main/java/turip/favorite/controller/dto/response/FavoriteContentCountResponse.java

@@ -0,0 +1,8 @@
+package turip.favorite.controller.dto.response;
+
+public record FavoriteContentCountResponse(int count) {
+
+    public static FavoriteContentCountResponse from(int count) {
+        return new FavoriteContentCountResponse(count);
+    }
+}

backend/turip-app/src/main/java/turip/favorite/repository/FavoriteContentRepository.java

@@ -56,5 +56,7 @@ Slice<Content> findMyFavoriteContentsByAccountId(
 
     boolean existsByAccount(Account account);
 
+    int countByAccount(Account account);
+
     void deleteByAccount(Account account);
 }

backend/turip-app/src/main/java/turip/favorite/service/FavoriteContentService.java

@@ -19,6 +19,7 @@
 import turip.content.repository.ContentRepository;
 import turip.content.service.ContentPlaceService;
 import turip.favorite.controller.dto.request.FavoriteContentRequest;
+import turip.favorite.controller.dto.response.FavoriteContentCountResponse;
 import turip.favorite.controller.dto.response.FavoriteContentResponse;
 import turip.favorite.domain.FavoriteContent;
 import turip.favorite.repository.FavoriteContentRepository;
@@ -64,6 +65,11 @@ public boolean existsByAccount(Account account) {
         return favoriteContentRepository.existsByAccount(account);
     }
 
+    public FavoriteContentCountResponse countByAccount(Account account) {
+        int count = favoriteContentRepository.countByAccount(account);
+        return FavoriteContentCountResponse.from(count);
+    }
+
     @Transactional
     public void remove(Account account, Long contentId) {
         Content content = contentRepository.findById(contentId)

backend/turip-app/src/test/java/turip/favorite/api/FavoriteContentApiTest.java

@@ -344,4 +344,42 @@ void readMyFavoriteContents_success() {
                     .body("loadable", is(false));
         }
     }
+
+    @DisplayName("/api/v1/bookmarks/count GET 콘텐츠 찜 수 조회 테스트")
+    @Nested
+    class ReadBookmarkCount {
+
+        @DisplayName("성공 시 200 OK 코드와 북마크 수를 반환한다")
+        @Test
+        void readBookmarkCount1() {
+            // given
+            jdbcTemplate.update(
+                    "INSERT INTO creator (profile_image, channel_name) VALUES ('https://image.example.com/creator.jpg', 'Travel')");
+            jdbcTemplate.update(
+                    "INSERT INTO country (name, image_url) VALUES ('대한민국', 'https://image.example.com/korea.jpg')");
+            jdbcTemplate.update(
+                    "INSERT INTO city (name, country_id, province_id, image_url) VALUES ('서울', 1, null,'https://image.example.com/seoul.jpg')");
+            Long accountId = testDataHelper.insertAccount();
+            jdbcTemplate.update("INSERT INTO guest (account_id, device_fid) VALUES (?, 'testDeviceFid')", accountId);
+
+            // 3개의 콘텐츠와 북마크 생성
+            for (int i = 1; i <= 3; i++) {
+                jdbcTemplate.update(
+                        "INSERT INTO content (creator_id, city_id, url, title, uploaded_date) VALUES (1, 1, 'https://youtube.com/watch?v=test"
+                                + i + "', '테스트 영상" + i + "', '2025-08-0" + i + "')");
+                jdbcTemplate.update(
+                        "INSERT INTO favorite_content (account_id, content_id, created_at) VALUES (?, " + i
+                                + ", CURRENT_TIMESTAMP)",
+                        accountId);
+            }
+
+            // when & then
+            RestAssured.given().port(port)
+                    .header("device-fid", "testDeviceFid")
+                    .when().get("/api/v1/bookmarks/count")
+                    .then()
+                    .statusCode(200)
+                    .body("count", is(3));
+        }
+    }
 }