feat: #89 판매자 정보 조회 API 구현

src/main/java/com/ajou/hertz/domain/instrument/repository/InstrumentRepository.java

@@ -2,7 +2,11 @@
 
 import org.springframework.data.jpa.repository.JpaRepository;
 
+import com.ajou.hertz.domain.instrument.constant.InstrumentProgressStatus;
 import com.ajou.hertz.domain.instrument.entity.Instrument;
 
 public interface InstrumentRepository extends JpaRepository<Instrument, Long>, InstrumentRepositoryCustom {
+
+	long countBySellerIdAndProgressStatus(Long sellerid, InstrumentProgressStatus progressStatus);
+
 }

src/main/java/com/ajou/hertz/domain/instrument/service/InstrumentQueryService.java

@@ -13,6 +13,7 @@
 import com.ajou.hertz.domain.instrument.audio_equipment.dto.request.AudioEquipmentFilterConditions;
 import com.ajou.hertz.domain.instrument.bass_guitar.dto.BassGuitarDto;
 import com.ajou.hertz.domain.instrument.bass_guitar.dto.request.BassGuitarFilterConditions;
+import com.ajou.hertz.domain.instrument.constant.InstrumentProgressStatus;
 import com.ajou.hertz.domain.instrument.constant.InstrumentSortOption;
 import com.ajou.hertz.domain.instrument.dto.InstrumentDto;
 import com.ajou.hertz.domain.instrument.effector.dto.EffectorDto;
@@ -194,4 +195,25 @@ public Page<AudioEquipmentDto> findAudioEquipmentDtos(
 			.findAudioEquipments(page, pageSize, sort, filterConditions)
 			.map(InstrumentMapper::toAmplifierDto);
 	}
+
+	/**
+	 * 판매자가 판매중인 물품의 수를 조회합니다
+	 *
+	 * @param sellerId 판매자 id
+	 *
+	 * @return 판매중인 물품의 수
+	 */
+	public long countSellingItemsBySellerId(Long sellerId) {
+		return instrumentRepository.countBySellerIdAndProgressStatus(sellerId, InstrumentProgressStatus.SELLING);
+	}
+
+	/**
+	 * 판매자가 판매완료한 물품들을 조회한다
+	 *
+	 * @param sellerId 판매자 id
+	 * @return 판매완료한 물품의 수
+	 */
+	public long countSoldItemsBySellerId(Long sellerId) {
+		return instrumentRepository.countBySellerIdAndProgressStatus(sellerId, InstrumentProgressStatus.SOLD_OUT);
+	}
 }

src/main/java/com/ajou/hertz/domain/user/controller/UserController.java

@@ -9,6 +9,7 @@
 import org.springframework.security.core.annotation.AuthenticationPrincipal;
 import org.springframework.validation.annotation.Validated;
 import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.PutMapping;
 import org.springframework.web.bind.annotation.RequestBody;
@@ -20,10 +21,12 @@
 
 import com.ajou.hertz.common.auth.UserPrincipal;
 import com.ajou.hertz.common.validator.PhoneNumber;
+import com.ajou.hertz.domain.instrument.service.InstrumentQueryService;
 import com.ajou.hertz.domain.user.dto.UserDto;
 import com.ajou.hertz.domain.user.dto.request.SignUpRequest;
 import com.ajou.hertz.domain.user.dto.request.UpdateContactLinkRequest;
 import com.ajou.hertz.domain.user.dto.request.UpdatePasswordRequest;
+import com.ajou.hertz.domain.user.dto.response.SellerInfoResponse;
 import com.ajou.hertz.domain.user.dto.response.UserEmailResponse;
 import com.ajou.hertz.domain.user.dto.response.UserExistenceResponse;
 import com.ajou.hertz.domain.user.dto.response.UserResponse;
@@ -52,6 +55,7 @@ public class UserController {
 
 	private final UserCommandService userCommandService;
 	private final UserQueryService userQueryService;
+	private final InstrumentQueryService instrumentQueryService;
 
 	@Operation(
 		summary = "내 정보 조회",
@@ -171,5 +175,20 @@ public UserResponse updatePasswordV1(
 		return UserResponse.from(userUpdated);
 	}
 
+	@Operation(
+		summary = "판매자 정보 조회",
+		description = "판매자 정보(유저 정보 + 판매 중인 매물 수 + 판매 완료 매물 수)를 조회합니다.",
+		security = @SecurityRequirement(name = "access-token")
+	)
+	@GetMapping(value = "/{userId}/seller", headers = API_VERSION_HEADER_NAME + "=" + 1)
+	public SellerInfoResponse getSellerInfoV1(
+		@PathVariable Long userId
+	) {
+		UserDto userDto = userQueryService.getDtoById(userId);
+		long sellingCount = instrumentQueryService.countSellingItemsBySellerId(userId);
+		long soldCount = instrumentQueryService.countSoldItemsBySellerId(userId);
+		return SellerInfoResponse.from(userDto, sellingCount, soldCount);
+	}
+
 }
 

src/main/java/com/ajou/hertz/domain/user/dto/response/SellerInfoResponse.java

@@ -0,0 +1,50 @@
+package com.ajou.hertz.domain.user.dto.response;
+
+import java.time.LocalDateTime;
+
+import com.ajou.hertz.domain.user.dto.UserDto;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@AllArgsConstructor(access = AccessLevel.PROTECTED)
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@Getter
+public class SellerInfoResponse {
+
+	@Schema(description = "Id of user", example = "1")
+	private Long id;
+
+	@Schema(description = "이메일", example = "[email protected]")
+	private String email;
+
+	@Schema(description = "프로필 이미지 url", example = "https://user-profile-image")
+	private String profileImage;
+
+	@Schema(description = "연락 수단", example = "https://contack-link")
+	private String contactLink;
+
+	@Schema(description = "가입일", example = "2024.01.01")
+	private LocalDateTime createdAt;
+
+	@Schema(description = "판매중인 물품의 수", example = "10")
+	private long sellingItemCount;
+
+	@Schema(description = "판매완료한 물품의 수", example = "10")
+	private long soldItemCount;
+
+	public static SellerInfoResponse from(UserDto userDto, long sellingItemCount, long soldItemCount) {
+		return new SellerInfoResponse(
+			userDto.getId(),
+			userDto.getEmail(),
+			userDto.getProfileImageUrl(),
+			userDto.getContactLink(),
+			userDto.getCreatedAt(),
+			sellingItemCount,
+			soldItemCount
+		);
+	}
+}