package com.zzsn.config;

import com.zzsn.filter.GlobalAccessTokenFilter;
import org.springframework.cloud.gateway.filter.ratelimit.KeyResolver;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import reactor.core.publisher.Mono;

/**
 * @author scott
 * @date 2020/5/26
 * 路由限流配置
 */
@Configuration
public class RateLimiterConfiguration {
	/**
	 * IP限流 (通过exchange对象可以获取到请求信息，这边用了HostName)
	 */
	@Bean
	@Primary
	public KeyResolver ipKeyResolver() {
		return exchange -> Mono.just(exchange.getRequest().getRemoteAddress().getAddress().getHostAddress());
	}

	/**
	 * 用户限流 (通过exchange对象可以获取到请求信息，获取当前请求的用户 TOKEN)
	 */
	@Bean
	public KeyResolver userKeyResolver() {
		//使用这种方式限流，请求Header中必须携带X-Access-Token参数
		return exchange -> Mono.just(exchange.getRequest().getHeaders().getFirst(GlobalAccessTokenFilter.X_ACCESS_TOKEN));
	}

	/**
	* 接口限流 (获取请求地址的uri作为限流key)
	*/
	@Bean
	public KeyResolver apiKeyResolver() {
		return exchange -> Mono.just(exchange.getRequest().getPath().value());
	}

}
