springcloud2 gateway 之三：使用filter做权限验证

「爱情、让人受尽委屈。」 2022-03-09 14:06 1037阅读 0赞

springcloud2 gateway 之一：简单样例  
[https://blog.csdn.net/haveqing/article/details/88424598][https_blog.csdn.net_haveqing_article_details_88424598]

springcloud2 gateway 之二：转发调用eureka客户端服务  
[https://blog.csdn.net/haveqing/article/details/88427571][https_blog.csdn.net_haveqing_article_details_88427571]

文件结构

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hhdmVxaW5n_size_16_color_FFFFFF_t_70][]

**一、GatewayConfig.java**

package com.urthink.upfs.springcloudgateway.config;
    
    import com.urthink.upfs.springcloudgateway.filter.TokenFilter;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    
    @Configuration
    public class GatewayConfig {
    
        @Bean
        public TokenFilter tokenFilter(){
            return new TokenFilter();
        }
    }

**二、TokenFilter.java**

每一个GlobalFilter都作用在每一个router上，能够满足大多数的需求。但是如果遇到业务上的定制，可能需要编写满足自己需求的GlobalFilter。在下面的案例中将讲述如何编写自己GlobalFilter，该GlobalFilter会校验请求中是否包含了请求参数“token”，如何不包含请求参数“token”则不转发路由，否则执行正常的逻辑。代码如下：

package com.urthink.upfs.springcloudgateway.filter;
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    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.web.server.ServerWebExchange;
    import reactor.core.publisher.Mono;
    
    /**
     * gateway全局过滤器
     * https://blog.csdn.net/forezp/article/details/85057268
     */
    public class TokenFilter implements GlobalFilter, Ordered {
    
        Logger logger= LoggerFactory.getLogger( TokenFilter.class );
        @Override
        public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
            String token = exchange.getRequest().getQueryParams().getFirst("token");
            if (token == null || token.isEmpty()) {
                logger.info( "token is empty..." );
                exchange.getResponse().setStatusCode(HttpStatus.UNAUTHORIZED);
                return exchange.getResponse().setComplete();
            }
            return chain.filter(exchange);
        }
    
        @Override
        public int getOrder() {
            return -100;
        }
    }

在上面的TokenFilter需要实现GlobalFilter和Ordered接口，这和实现GatewayFilter很类似。然后根据ServerWebExchange获取ServerHttpRequest，然后根据ServerHttpRequest中是否含有参数token，如果没有则完成请求，终止转发，否则执行正常的逻辑。

**三、访问**

[http://localhost:8080/app2/demo/test1][http_localhost_8080_app2_demo_test1]

返回 401 Unauthorized

[http://localhost:8080/app2/demo/test1?token=tokendata][http_localhost_8080_app2_demo_test1_token_tokendata]

正常返回数据

既然gateway已经连接到eureka，就可以通过feign调用其他服务，做更复杂的权限验证了，而不必直接连数据库。

**参考：**

spring cloud gateway之filter篇  
[https://blog.csdn.net/forezp/article/details/85057268][https_blog.csdn.net_forezp_article_details_85057268]

Spring-Cloud-Gateway之过滤器GatewayFilter  
[https://www.jianshu.com/p/eb3a67291050][https_www.jianshu.com_p_eb3a67291050]

spring cloud gateway 2 深入了解 - filter  
[https://www.jianshu.com/p/5e40bbc95eb9][https_www.jianshu.com_p_5e40bbc95eb9]

微服务架构spring cloud - Gateway过滤器（十二）  
[https://blog.csdn.net/m0\_37834471/article/details/82621337][https_blog.csdn.net_m0_37834471_article_details_82621337]

[https_blog.csdn.net_haveqing_article_details_88424598]: https://blog.csdn.net/haveqing/article/details/88424598
[https_blog.csdn.net_haveqing_article_details_88427571]: https://blog.csdn.net/haveqing/article/details/88427571
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hhdmVxaW5n_size_16_color_FFFFFF_t_70]: /images/20220309/f158bd87b4314ab0b1d148624cdd4ab0.png
[http_localhost_8080_app2_demo_test1]: http://localhost:8080/app2/demo/test1
[http_localhost_8080_app2_demo_test1_token_tokendata]: http://localhost:8080/app2/demo/test1?token=tokendata
[https_blog.csdn.net_forezp_article_details_85057268]: https://blog.csdn.net/forezp/article/details/85057268
[https_www.jianshu.com_p_eb3a67291050]: https://www.jianshu.com/p/eb3a67291050
[https_www.jianshu.com_p_5e40bbc95eb9]: https://www.jianshu.com/p/5e40bbc95eb9
[https_blog.csdn.net_m0_37834471_article_details_82621337]: https://blog.csdn.net/m0_37834471/article/details/82621337