Eureka Server增加Spring Security后的服务端和客户端配置

　　直接上代码吧，Eureka Server端主要依赖的版本：

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
            <version>2.2.3.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
            <version>2.3.1.RELEASE</version>
        </dependency>

　　Eureka Server端的application.yml配置

server:
  port: 8761
eureka:
  server: 
#　　这里只是为了测试方便才修改的无效服务剔除时间间隔，生产环境尽量不要改
    eviction-interval-timer-in-ms: 3000
  client:
    register-with-eureka: false
    fetch-registry: false
    service-url:
      defaultZone: http://user:pwd123@localhost:8761/eureka/
spring:
  application:
    name: discovery-eureka-auth
  cloud:
    loadbalancer:
      ribbon:
        enabled: false
    inetutils:
#      preferred-networks:
#        - 192.168.0
      ignored-interfaces:
        - VM.*
  security:
    user:
      name: user
      password: pwd123

　　对于现在较新的版本的Spring Security的security.basic.enabled配置项已经不可用了，要配置该属性可以通过继承并重写 WebSecurityConfigurerAdapter :

import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;

@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests()
                .anyRequest().authenticated()
                .and()
                .httpBasic()
                .and()
                .csrf().ignoringAntMatchers("/eureka/**");
    }
}

　　引入新版的Spring Security后会自动开启CSRF安全验证，默认所有请求都要求提供CSRF的token，这就导致Eureka Client启动后向Eureka Server进行服务注册时也被要求提供CSRF的token，但是Eureka Client并不会生成CSRF要的token，目前也没看到手工让Eureka Client携带token的机制，

最终导致Eureka Client向Eureka Server服务注册失败，出现类似下面的异常：

2020-07-10 22:32:43.561 ERROR 21416 --- [tbeatExecutor-0] c.n.d.s.t.d.RedirectingEurekaHttpClient  : Request execution error. endpoint=DefaultEndpoint{ serviceUrl='http://user:pwd123@localhost:8761/eureka/}

　　解决该异常的方法就是重写 WebSecurityConfigurerAdapter时，设置CSRF忽略掉与eureka相关的路径(上文代码中的.csrf().ignoringAntMatchers("/eureka/**"))，当然也可以直接禁用掉CSRF，但不建议这么做：

import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;

@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests()
                .anyRequest().authenticated()
                .and()
                .httpBasic()
                .and()
                .csrf().disable();//不建议完全禁用掉csrf
    }
}

　　Eureka Client端只要修改一下eureka.client.service-url.defaultZone就可以了：

eureka:
  instance:
#　　这里只是为了测试方便修改的服务租期相关时间，生产环境不要改
    lease-expiration-duration-in-seconds: 10
    lease-renewal-interval-in-seconds: 5
    prefer-ip-address: true
  client:
    service-url:
      defaultZone: http://user:pwd123@localhost:8761/eureka/