chore: 회원가입 후 추가 정보 입력 예외 처리 추가

src/main/java/com/gpt/geumpumtabackend/global/exception/ExceptionType.java

@@ -30,7 +30,7 @@ public enum ExceptionType {
     // User
     USER_NOT_FOUND(NOT_FOUND, "U001","사용자가 존재하지 않습니다"),
     SCHOOL_EMAIL_ALREADY_REGISTERED(FORBIDDEN, "U002", "학교 이메일이 등록된 상태입니다"),
-    DUPLICATED_SCHOOL_EMAIL(CONFLICT, "U003", "이미 사용중인 이메일입니다"),
+    DUPLICATED_SCHOOL_EMAIL(CONFLICT, "U003", "이미 사용중인 학교 이메일입니다"),
     DEPARTMENT_NOT_FOUND(BAD_REQUEST, "U004", "존재하지 않는 학과 명입니다"),
     USER_WITHDRAWN(FORBIDDEN, "U005", "탈퇴한 사용자입니다."),
     DUPLICATED_STUDENT_ID(CONFLICT, "U006", "이미 사용중인 학번입니다."),

src/main/java/com/gpt/geumpumtabackend/user/repository/UserRepository.java

@@ -2,6 +2,7 @@
 
 import com.gpt.geumpumtabackend.global.oauth.user.OAuth2Provider;
 import com.gpt.geumpumtabackend.user.domain.User;
+import jakarta.validation.constraints.Pattern;
 import org.springframework.data.jpa.repository.JpaRepository;
 
 import java.util.List;
@@ -19,4 +20,8 @@ public interface UserRepository extends JpaRepository<User, Long> {
     Optional<User> findByProviderAndProviderIdAndDeletedAtIsNull(OAuth2Provider provider, String providerId);
 
     Optional<User> findByProviderAndProviderId(OAuth2Provider provider, String providerId);
+
+    boolean existsByStudentId(String studentId);
+
+    boolean existsBySchoolEmail(String schoolEmail);
 }

src/main/java/com/gpt/geumpumtabackend/user/service/UserService.java

@@ -55,11 +55,11 @@ public void generateRandomNickname(User user){
         user.setInitialNickname(nickname);
     }
 
-    // TODO : 데이터 중복 검증 추가하기
     @Transactional
     public TokenResponse completeRegistration(CompleteRegistrationRequest request, Long userId) {
         User user = userRepository.findById(userId)
                 .orElseThrow(()->new BusinessException(ExceptionType.USER_NOT_FOUND));
+        validateDuplication(request);
         user.completeRegistration(request);
         generateRandomNickname(user);
 
@@ -69,6 +69,16 @@ public TokenResponse completeRegistration(CompleteRegistrationRequest request, L
         return TokenResponse.to(token);
     }
 
+    private void validateDuplication(CompleteRegistrationRequest request) {
+        if(userRepository.existsBySchoolEmail((request.email()))){
+            throw new BusinessException(ExceptionType.DUPLICATED_SCHOOL_EMAIL);
+        }
+
+        if(userRepository.existsByStudentId(request.studentId())){
+            throw new BusinessException(ExceptionType.DUPLICATED_STUDENT_ID);
+        }
+    }
+
     public UserProfileResponse getUserProfile(Long userId) {
         User user = userRepository.findById(userId)
                 .orElseThrow(()->new BusinessException(ExceptionType.USER_NOT_FOUND));