feat: 과제 조회 API 추가

src/main/java/com/gdschongik/gdsc/domain/study/api/StudyMentorController.java

@@ -1,9 +1,12 @@
 package com.gdschongik.gdsc.domain.study.api;
 
+import com.gdschongik.gdsc.domain.study.application.StudyMentorService;
 import com.gdschongik.gdsc.domain.study.domain.request.AssignmentCreateRequest;
+import com.gdschongik.gdsc.domain.study.dto.response.AssignmentResponse;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.tags.Tag;
 import jakarta.validation.Valid;
+import java.util.List;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
@@ -14,10 +17,26 @@
 @RequiredArgsConstructor
 public class StudyMentorController {
 
+    private final StudyMentorService studyMentorService;
+
     @Operation(summary = "스터디 과제 개설", description = "멘토만 과제를 개설할 수 있습니다.")
     @PutMapping("/assignment/{assignmentId}")
     public ResponseEntity<Void> createStudyAssignment(
             @PathVariable Long assignmentId, @Valid @RequestBody AssignmentCreateRequest request) {
         return null;
     }
+
+    @Operation(summary = "스터디 주차별 과제 목록 조회", description = "주차별 스터디 과제 목록을 조회합니다.")
+    @GetMapping("/assignments/{studyId}")
+    public ResponseEntity<List<AssignmentResponse>> getWeeklyAssignments(@PathVariable Long studyId) {
+        List<AssignmentResponse> response = studyMentorService.getWeeklyAssignments(studyId);
+        return ResponseEntity.ok(response);
+    }
+
+    @Operation(summary = "스터디 과제 상세 조회", description = "멘토가 자신의 스터디 과제를 조회합니다.")
+    @GetMapping("/assignments/{studyDetailId}")
+    public ResponseEntity<AssignmentResponse> getStudyAssignment(@PathVariable Long studyDetailId) {
+        AssignmentResponse response = studyMentorService.getAssignment(studyDetailId);
+        return ResponseEntity.ok(response);
+    }
 }

src/main/java/com/gdschongik/gdsc/domain/study/application/StudyMentorService.java

@@ -0,0 +1,35 @@
+package com.gdschongik.gdsc.domain.study.application;
+
+import static com.gdschongik.gdsc.global.exception.ErrorCode.*;
+
+import com.gdschongik.gdsc.domain.study.dao.StudyDetailRepository;
+import com.gdschongik.gdsc.domain.study.domain.StudyDetail;
+import com.gdschongik.gdsc.domain.study.dto.response.AssignmentResponse;
+import com.gdschongik.gdsc.global.exception.CustomException;
+import java.util.List;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class StudyMentorService {
+
+    private final StudyDetailRepository studyDetailRepository;
+
+    @Transactional(readOnly = true)
+    public List<AssignmentResponse> getWeeklyAssignments(Long studyId) {
+        List<StudyDetail> studyDetails = studyDetailRepository.findAllByStudyId(studyId);
+        return studyDetails.stream().map(AssignmentResponse::from).toList();
+    }
+
+    @Transactional(readOnly = true)
+    public AssignmentResponse getAssignment(Long studyDetailId) {
+        StudyDetail studyDetail = studyDetailRepository
+                .findById(studyDetailId)
+                .orElseThrow(() -> new CustomException(STUDY_DETAIL_NOT_FOUND));
+        return AssignmentResponse.from(studyDetail);
+    }
+}

src/main/java/com/gdschongik/gdsc/domain/study/dao/StudyDetailRepository.java

@@ -1,6 +1,10 @@
 package com.gdschongik.gdsc.domain.study.dao;
 
 import com.gdschongik.gdsc.domain.study.domain.StudyDetail;
+import java.util.List;
 import org.springframework.data.jpa.repository.JpaRepository;
 
-public interface StudyDetailRepository extends JpaRepository<StudyDetail, Long> {}
+public interface StudyDetailRepository extends JpaRepository<StudyDetail, Long> {
+
+    List<StudyDetail> findAllByStudyId(Long studyId);
+}

src/main/java/com/gdschongik/gdsc/domain/study/dto/response/AssignmentResponse.java

@@ -0,0 +1,23 @@
+package com.gdschongik.gdsc.domain.study.dto.response;
+
+import com.gdschongik.gdsc.domain.study.domain.StudyDetail;
+import com.gdschongik.gdsc.domain.study.domain.StudyStatus;
+import com.gdschongik.gdsc.domain.study.domain.vo.Assignment;
+import io.swagger.v3.oas.annotations.media.Schema;
+
+public record AssignmentResponse(
+        Long studyDetailId,
+        @Schema(description = "과제 제목") String title,
+        @Schema(description = "마감 기한") String deadline,
+        @Schema(description = "과제 명세 링크") String descriptionLink,
+        @Schema(description = "과제 상태") StudyStatus assignmentStatus) {
+    public static AssignmentResponse from(StudyDetail studyDetail) {
+        Assignment assignment = studyDetail.getAssignment();
+        return new AssignmentResponse(
+                studyDetail.getId(),
+                assignment.getTitle(),
+                assignment.getDeadline().toString(),
+                assignment.getDescriptionLink(),
+                assignment.getStatus());
+    }
+}

src/main/java/com/gdschongik/gdsc/global/exception/ErrorCode.java

@@ -109,6 +109,9 @@ public enum ErrorCode {
     STUDY_NOT_APPLICABLE(HttpStatus.CONFLICT, "스터디 신청기간이 아닙니다."),
     STUDY_NOT_CANCELABLE_APPLICATION_PERIOD(HttpStatus.CONFLICT, "스터디 신청기간이 아니라면 취소할 수 없습니다."),
 
+    // StudyDetail
+    STUDY_DETAIL_NOT_FOUND(HttpStatus.NOT_FOUND, "존재하지 않는 스터디 상세 정보입니다."),
+
     // StudyHistory
     STUDY_HISTORY_NOT_FOUND(HttpStatus.NOT_FOUND, "존재하지 않는 스터디 수강 기록입니다."),
     STUDY_HISTORY_DUPLICATE(HttpStatus.CONFLICT, "이미 해당 스터디를 신청했습니다."),