feat(volunteer-apply): 봉사 지원 철회 기능

Author: leebs0521

src/main/java/com/somemore/global/exception/ExceptionMessage.java

@@ -31,6 +31,7 @@ public enum ExceptionMessage {
     NOT_EXISTS_REVIEW("존재하지 않는 리뷰입니다."),
     RECRUITMENT_NOT_OPEN("현재 모집 진행 중이 아닙니다."),
     DUPLICATE_APPLICATION("이미 신청한 봉사 모집 공고입니다."),
+    UNAUTHORIZED_VOLUNTEER_APPLY("해당 지원에 권한이 없습니다."),
 
     ;
     private final String message;

src/main/java/com/somemore/volunteerapply/service/WithdrawVolunteerApplyService.java

@@ -0,0 +1,44 @@
+package com.somemore.volunteerapply.service;
+
+import static com.somemore.global.exception.ExceptionMessage.NOT_EXISTS_VOLUNTEER_APPLY;
+import static com.somemore.global.exception.ExceptionMessage.UNAUTHORIZED_VOLUNTEER_APPLY;
+
+import com.somemore.global.exception.BadRequestException;
+import com.somemore.volunteerapply.domain.VolunteerApply;
+import com.somemore.volunteerapply.repository.VolunteerApplyRepository;
+import com.somemore.volunteerapply.usecase.WithdrawVolunteerApplyUseCase;
+import java.util.UUID;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@RequiredArgsConstructor
+@Transactional
+@Service
+public class WithdrawVolunteerApplyService implements WithdrawVolunteerApplyUseCase {
+
+    private final VolunteerApplyRepository volunteerApplyRepository;
+
+    @Override
+    public void withdraw(Long id, UUID volunteerId) {
+        VolunteerApply apply = getApply(id);
+        validateVolunteerIdentity(apply, volunteerId);
+
+        apply.markAsDeleted();
+        volunteerApplyRepository.save(apply);
+    }
+
+    private VolunteerApply getApply(Long id) {
+        return volunteerApplyRepository.findById(id).orElseThrow(
+                () -> new BadRequestException(NOT_EXISTS_VOLUNTEER_APPLY)
+        );
+    }
+
+    private void validateVolunteerIdentity(VolunteerApply apply, UUID volunteerId) {
+        if (apply.isOwnApplication(volunteerId)) {
+            return;
+        }
+
+        throw new BadRequestException(UNAUTHORIZED_VOLUNTEER_APPLY);
+    }
+}

src/main/java/com/somemore/volunteerapply/usecase/WithdrawVolunteerApplyUseCase.java

@@ -0,0 +1,9 @@
+package com.somemore.volunteerapply.usecase;
+
+import java.util.UUID;
+
+public interface WithdrawVolunteerApplyUseCase {
+
+    void withdraw(Long id, UUID volunteerId);
+
+}