package com.xiaojie.mapper;
import com.xiaojie.entity.Route;
import org.apache.ibatis.annotations.*;
import java.util.List;
/**
 * @Description:Mapper接口
 * @author: xiaojie
 * @date: 2021.07.15
 */
public interface RouteMapper {
    @Select("SELECT id,routeId,routeName,routePattern,routeType,routeUrl,is_open isOpen,is_use isUse FROM `tb_route` WHERE is_open=1 and is_use=1;")
    List<Route> selectAllRoute();
    @Insert("INSERT INTO tb_route(routeId,routeName,routePattern,routeType,routeUrl,is_open,is_use) " +
            "VALUES(#{routeId},#{routeName},#{routePattern},#{routeType},#{routeUrl},#{isOpen},#{isUse})")
    @Options(useGeneratedKeys = true, keyProperty = "id")
    Integer add(Route route);
    @Update("UPDATE tb_route set routePattern=#{routePattern},routeUrl=#{routeUrl} WHERE routeId=#{routeId}")
    Integer update(Route route);
    @Delete("DELETE FROM tb_route WHERE routeId=#{routeId}")
    Integer delete(String routeId);
}

package com.xiaojie.service.impl;
import com.xiaojie.entity.Route;
import com.xiaojie.mapper.RouteMapper;
import com.xiaojie.service.RouteService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.event.RefreshRoutesEvent;
import org.springframework.cloud.gateway.filter.FilterDefinition;
import org.springframework.cloud.gateway.handler.predicate.PredicateDefinition;
import org.springframework.cloud.gateway.route.RouteDefinition;
import org.springframework.cloud.gateway.route.RouteDefinitionWriter;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.context.ApplicationEventPublisherAware;
import org.springframework.stereotype.Service;
import org.springframework.web.util.UriComponentsBuilder;
import reactor.core.publisher.Mono;
import java.net.URI;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
 * @Description:
 * @author: xiaojie
 * @date: 2021.07.15
 */
@Service
@Slf4j
public class RouteServiceImpl  implements RouteService, ApplicationEventPublisherAware {
    private ApplicationEventPublisher applicationEventPublisher;
    @Autowired
    private RouteMapper routeMapper;
    @Autowired
    private RouteDefinitionWriter routeDefinitionWriter;
    @Override
    public List<Route> getAll() {
        List<Route> routes = routeMapper.selectAllRoute();
        for (Route  route: routes){
            loadRoute(route);
        }
        return routes;
    }
    public void loadRoute(Route route) {
        RouteDefinition definition = new RouteDefinition();
        Map<String, String> predicateParams = new HashMap<>(8);
        PredicateDefinition predicate = new PredicateDefinition();
        FilterDefinition filterDefinition = new FilterDefinition();
        Map<String, String> filterParams = new HashMap<>(8);
        URI uri = null;
        if (1==route.getRouteType()) {
            // 如果配置路由type为1的话 则从注册中心获取服务地址
            uri = UriComponentsBuilder.fromUriString(route.getRouteUrl()).build().toUri();
        } else {
            uri = UriComponentsBuilder.fromHttpUrl(route.getRouteUrl()).build().toUri();
        }
        // 定义的路由唯一的id
        definition.setId(route.getRouteId());
        predicate.setName("Path");
        //路由转发地址
        predicateParams.put("pattern", route.getRoutePattern());
        predicate.setArgs(predicateParams);
        filterDefinition.setName("StripPrefix");
        filterParams.put("_genkey_0", "1");
        filterDefinition.setArgs(filterParams);
        definition.setPredicates(Arrays.asList(predicate));
        definition.setFilters(Arrays.asList(filterDefinition));
        definition.setUri(uri);
        routeDefinitionWriter.save(Mono.just(definition)).subscribe();
        this.applicationEventPublisher.publishEvent(new RefreshRoutesEvent(this));
        log.info("路由刷新成功.............................");
    }
    @Override
    public void setApplicationEventPublisher(ApplicationEventPublisher applicationEventPublisher) {
        this.applicationEventPublisher=applicationEventPublisher;
    }
}

package com.xiaojie.config;
import org.springframework.cloud.gateway.filter.ratelimit.KeyResolver;
import org.springframework.cloud.gateway.filter.ratelimit.RateLimiter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;
import reactor.core.publisher.Mono;
/**
 * @Description:
 * @author: xiaojie
 * @date: 2021.07.16
 */
@Configuration
public class MyKeyResolver {
    /*
     *  ip限流 每一个ip只能在限流的规则内访问的规则，超出规则，进行限流
     * @todo
     * @author xiaojie
     * @date 2021/7/16 9:44
     * @return org.springframework.cloud.gateway.filter.ratelimit.KeyResolver
     */
//    @Bean("ipKeyResolver")
//    @Primary
//    public KeyResolver ipKeyResolver() {
//        return exchange -> Mono.just(exchange.getRequest().getRemoteAddress().getHostString());
//    }
    /*
     *  用户限流 每一个用户的限流规则 访问时需要携带userId 参数
     * @todo
     * @author xiaojie
     * @date 2021/7/16 9:44
     * @return org.springframework.cloud.gateway.filter.ratelimit.KeyResolver
     */
    @Bean("userKeyResolver")
    KeyResolver userKeyResolver() {
        return exchange -> Mono.just(exchange.getRequest().getQueryParams().getFirst("userId"));
    }
    /*
     * 接口限流 根据接口路径限流
     * @todo
     * @author xiaojie 
     * @date 2021/7/16 9:45 
     * @return org.springframework.cloud.gateway.filter.ratelimit.KeyResolver
     */
//    @Bean("apiKeyResolver")
//    KeyResolver apiKeyResolver() {
//        return exchange -> Mono.just(exchange.getRequest().getPath().value());
//    }
}

package com.xiaojie.filter;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;
import java.io.UnsupportedEncodingException;
import java.nio.charset.StandardCharsets;
/**
 * @Description: 黑名单
 * @author: xiaojie
 * @date: 2021.07.16
 */
@Component
@Slf4j
public class IpFilter implements GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        String ipAddress = getIpAddress(request);
        log.info("获取的IP地址为{}",ipAddress);
        //实际生产可以基于redis，数据库实现记录
        if ("127.0.0.1".equals(ipAddress)){
            ServerHttpResponse response = exchange.getResponse();
            HttpHeaders httpHeaders = response.getHeaders();
            httpHeaders.setContentType(MediaType.APPLICATION_JSON);
            response.setStatusCode(HttpStatus.INTERNAL_SERVER_ERROR);
            String msg="已被加入黑名单";
            DataBuffer buffer = response.bufferFactory().wrap(msg.getBytes());
            return response.writeWith(Mono.just(buffer));
        }
        return chain.filter(exchange);
    }
    /*
     * 获取用户真实ip 
     * @todo
     * @author xiaojie 
     * @date 2021/7/16 14:52
     * @return java.lang.String
     */
    public static String getIpAddress(ServerHttpRequest  request) {
        HttpHeaders headers = request.getHeaders();
        String ip = headers.getFirst("x-forwarded-for");
        if (ip != null && ip.length() != 0 && !"unknown".equalsIgnoreCase(ip)) {
            // 多次反向代理后会有多个ip值，第一个ip才是真实ip
            if (ip.indexOf(",") != -1) {
                ip = ip.split(",")[0];
            }
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = headers.getFirst("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = headers.getFirst("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = headers.getFirst("HTTP_CLIENT_IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = headers.getFirst("HTTP_X_FORWARDED_FOR");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = headers.getFirst("X-Real-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddress().getAddress().getHostAddress();
        }
        return ip;
    }
}