[CHORE] 로그 추가

Author: EunbeenDev

src/main/java/com/example/ai_tutor/domain/auth/application/CustomUserDetailsService.java

@@ -6,13 +6,15 @@
 import com.example.ai_tutor.global.config.security.token.UserPrincipal;
 import jakarta.transaction.Transactional;
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 import org.springframework.security.core.userdetails.UserDetails;
 import org.springframework.security.core.userdetails.UserDetailsService;
 import org.springframework.security.core.userdetails.UsernameNotFoundException;
 import org.springframework.stereotype.Service;
 
 import java.util.Optional;
 
+@Slf4j
 @RequiredArgsConstructor
 @Service
 public class CustomUserDetailsService implements UserDetailsService {
@@ -21,21 +23,21 @@ public class CustomUserDetailsService implements UserDetailsService {
 
     @Override
     public UserDetails loadUserByUsername(String email) throws UsernameNotFoundException {
-
+        log.debug("Trying to load user by email: {}", email);
         User user = userRepository.findByEmail(email)
-                .orElseThrow(() ->
-                        new UsernameNotFoundException("유저 정보를 찾을 수 없습니다.")
-                );
+                .orElseThrow(() -> new UsernameNotFoundException("유저 정보를 찾을 수 없습니다."));
 
+        log.debug("User found: {}", user);
         return UserPrincipal.create(user);
     }
 
     @Transactional
     public UserDetails loadUserById(Long id) {
+        log.debug("Trying to load user by ID: {}", id);
         Optional<User> user = userRepository.findById(id);
         DefaultAssert.isOptionalPresent(user);
 
+        log.debug("User found by ID: {}", user);
         return UserPrincipal.create(user.get());
     }
-
-}
+}