一网关作用

网关整合 OAuth2.0 有 两种思路：

1.一种是认证服务器生成jwt令牌, 所有请求统一在网关层验证，判断权限等操作；

2.另一 种是由各资源服务处理，网关只做请求转发 。

本案例就是API 网关作为 OAuth2.0 的资源服务器角色，实现接入客户端权限拦截、令牌解析并转发当前 登录用户信息(jsonToken) 给微服务，这样下游微服务就不需要关心令牌格式解析以及 OAuth2.0 相关机制了。

API 网关在认证授权体系里主要负责两件事：

（ 1 ） 作为OAuth2.0的资源服务器角色，实现接入方权限拦截。

（ 2 ） 令牌解析并转发当前登录用户信息（明文token）给微服务，

微服务拿到明文token( 明文 token 中包含登录用户的身份和权限信息 ) 后也需要做两件事：

（ 1 ） 用户授权拦截（看当前用户是否有权访问该资源）

（ 2 ） 将用户信息存储进当前线程上下文（有利于后续业务逻辑随时获取当前用户信息）

二 . 工程搭建

2.1 工程结构

2.2 pom文件配置

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>spt-ds-oauth-server</artifactId>
        <groupId>com.ljf.springsecurity.oauth</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.ljf.springsecurity.oauth</groupId>
    <artifactId>spt-ds-gateway-api</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

        <dependency>
            <groupId>com.netflix.hystrix</groupId>
            <artifactId>hystrix-javanica</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.retry</groupId>
            <artifactId>spring-retry</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-security</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-oauth2</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-jwt</artifactId>
        </dependency>

        <dependency>
            <groupId>javax.interceptor</groupId>
            <artifactId>javax.interceptor-api</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

    </dependencies>

</project>

2.3 application配置文件

spring.application.name=gateway-server
server.port=53010
spring.main.allow-bean-definition-overriding = true

logging.level.root = info
logging.level.org.springframework = info

zuul.retryable = true
zuul.ignoredServices = *
zuul.add-host-header = true
zuul.sensitiveHeaders = *

zuul.routes.uaa-service.stripPrefix = false
zuul.routes.uaa-service.path = /uaa/**

zuul.routes.order-service.stripPrefix = false
zuul.routes.order-service.path = /order/**

eureka.client.serviceUrl.defaultZone = http://localhost:53000/eureka/
eureka.instance.preferIpAddress = true
eureka.instance.instance-id = ${spring.application.name}:${spring.cloud.client.ip-address}:${spring.application.instance_id:${server.port}}
management.endpoints.web.exposure.include = refresh,health,info,env

feign.hystrix.enabled = true
feign.compression.request.enabled = true
feign.compression.request.mime-types[0] = text/xml
feign.compression.request.mime-types[1] = application/xml
feign.compression.request.mime-types[2] = application/json
feign.compression.request.min-request-size = 2048
feign.compression.response.enabled = true

统一认证服务（ UAA ）与统一用户服务都是网关下微服务，需要在网关上新增路由配置：

图中标红的部分需要根据实际情况进行修改

请求url若符合/order/**表达式，将被被转发至order-service(统一用户服务)。

请求url若符合/uaa/**表达式，将被被转发至uaa-service(授权服务)。 ???????

2.4?启动类

package com.ljf.springsecurity.oauth;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;

/**
 * Hello world!
 *
 */
@SpringBootApplication
@EnableZuulProxy
@EnableDiscoveryClient
public class GateWayApp
{
    public static void main( String[] args )
    {

        SpringApplication.run(GateWayApp.class, args);
    }
}