content: package io.github.xxyopen.novel.monitor.config;
  
  import jakarta.servlet.FilterChain;
  import jakarta.servlet.ServletException;
  import jakarta.servlet.http.Cookie;
  import jakarta.servlet.http.HttpServletRequest;
  import jakarta.servlet.http.HttpServletResponse;
  import org.springframework.security.web.csrf.CsrfToken;
  import org.springframework.web.filter.OncePerRequestFilter;
  import org.springframework.web.util.WebUtils;
  
  import java.io.IOException;
  
  /**
   * @author xiongxiaoyang
   * @date 2023/3/29
   */
  public class CustomCsrfFilter extends OncePerRequestFilter {
  
      public static final String CSRF_COOKIE_NAME = "XSRF-TOKEN";
  
      @Override
      protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
          throws ServletException, IOException {
  
          CsrfToken csrf = (CsrfToken) request.getAttribute(CsrfToken.class.getName());
  
          if (csrf != null) {
  
              Cookie cookie = WebUtils.getCookie(request, CSRF_COOKIE_NAME);
              String token = csrf.getToken();
  
              if (cookie == null || token != null && !token.equals(cookie.getValue())) {
                  cookie = new Cookie(CSRF_COOKIE_NAME, token);
                  cookie.setPath("/");
                  response.addCookie(cookie);
              }
          }
  
          filterChain.doFilter(request, response);
      }
  
  }
  
  