如何按IP限制Spring Cloud Gateway

import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.List;

@Component
public class IPWhitelistFilter implements GlobalFilter, Ordered {

    private final List<String> whitelist = List.of("192.168.1.1", "192.168.1.2");

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        String clientIp = exchange.getRequest().getRemoteAddress().getAddress().getHostAddress();
        if (!whitelist.contains(clientIp)) {
            exchange.getResponse().setStatusCode(HttpStatus.FORBIDDEN);
            return exchange.getResponse().setComplete();
        }
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}

String clientIp = exchange.getRequest().getHeaders().getFirst("X-Forwarded-For");
if (clientIp == null || clientIp.isEmpty()) {
    clientIp = exchange.getRequest().getRemoteAddress().getAddress().getHostAddress();
}

spring:
  cloud:
    gateway:
      routes:
        - id: service_route
          uri: lb://service
          predicates:
            - Path=/service/**
          filters:
            - name: IPWhitelist
              args:
                whitelist: ${ip.whitelist}