feat: 사용자 닉네임 제한 기능 추가 (#165)

- UserProperties 클래스를 생성하여 금지된 닉네임 목록을 관리.
- UserService에서 닉네임 중복 및 금지된 닉네임 검증 로직 추가.
- application.yml 파일에 금지된 닉네임 설정 추가.

Author: jayn2u

src/main/java/ssu/eatssu/domain/user/config/UserProperties.java

@@ -0,0 +1,19 @@
+package ssu.eatssu.domain.user.config;
+
+import lombok.Getter;
+import lombok.Setter;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.stereotype.Component;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Getter
+@Setter
+@Component
+@ConfigurationProperties(prefix = "user")
+public class UserProperties {
+
+    private List<String> forbiddenNicknames = new ArrayList<>();
+
+} 

src/main/java/ssu/eatssu/domain/user/service/UserService.java

@@ -14,6 +14,7 @@
 import ssu.eatssu.domain.auth.entity.OAuthProvider;
 import ssu.eatssu.domain.auth.security.CustomUserDetails;
 import ssu.eatssu.domain.review.entity.Review;
+import ssu.eatssu.domain.user.config.UserProperties;
 import ssu.eatssu.domain.user.department.entity.Department;
 import ssu.eatssu.domain.user.department.persistence.DepartmentRepository;
 import ssu.eatssu.domain.user.dto.DepartmentResponse;
@@ -34,6 +35,7 @@ public class UserService {
 	private final UserRepository userRepository;
 	private final PasswordEncoder passwordEncoder;
 	private final DepartmentRepository departmentRepository;
+	private final UserProperties userProperties;
 
 	public User join(String email, OAuthProvider provider, String providerId) {
 		String credentials = createCredentials(provider, providerId);
@@ -46,6 +48,10 @@ public void updateNickname(CustomUserDetails userDetails, NicknameUpdateRequest
 		User user = userRepository.findById(userDetails.getId())
 								  .orElseThrow(() -> new BaseException(NOT_FOUND_USER));
 
+		if (isForbiddenNickname(request.nickname()) || userRepository.existsByNickname(request.nickname())) {
+			throw new BaseException(DUPLICATE_NICKNAME);
+		}
+
 		user.updateNickname(request.nickname());
 	}
 
@@ -71,6 +77,9 @@ public Boolean validateDuplicatedEmail(String email) {
 	}
 
 	public Boolean validateDuplicatedNickname(String nickname) {
+		if (isForbiddenNickname(nickname)) {
+			return false;
+		}
 		return !userRepository.existsByNickname(nickname);
 	}
 
@@ -109,4 +118,9 @@ public DepartmentResponse getDepartment(CustomUserDetails userDetails) {
 		}
 		return new DepartmentResponse(department.getName());
 	}
+
+	private boolean isForbiddenNickname(String nickname) {
+		return userProperties.getForbiddenNicknames().stream()
+				.anyMatch(forbidden -> forbidden.equalsIgnoreCase(nickname));
+	}
 }

src/main/resources/application.yml

@@ -1,6 +1,11 @@
 spring:
   profiles:
-#     include : prod
-#     include : dev
-     include : local
-#    include: test
+    # include : prod
+    # include : dev
+    include : local
+    # include: test
+
+user:
+  forbidden-nicknames:
+    - EAT-SSU
+    - EATSSU