content: package com.example.identityservice.auth;
  
  import com.example.identityservice.token.TokenRepository;
  import jakarta.servlet.http.HttpServletRequest;
  import jakarta.servlet.http.HttpServletResponse;
  import lombok.RequiredArgsConstructor;
  import org.springframework.security.core.Authentication;
  import org.springframework.security.web.authentication.logout.LogoutHandler;
  import org.springframework.stereotype.Service;
  
  @Service
  @RequiredArgsConstructor
  public class LogoutService implements LogoutHandler {
  
      private final TokenRepository tokenRepository;
  
      @Override
      public void logout(HttpServletRequest request,
                         HttpServletResponse response,
                         Authentication authentication) {
  
          final String authHeader = request.getHeader("Authorization");
          final String jwt;
  
          if (authHeader == null || !authHeader.startsWith("Bearer ")) {
              return;
          }
  
          jwt = authHeader.substring(7);
  
          var storedToken = tokenRepository.findByToken(jwt).orElse(null);
  
          if (storedToken != null) {
              storedToken.setExpired(true);
              storedToken.setRevoked(true);
              tokenRepository.save(storedToken);
          }
      }
  }
  