Feign支持BasicAuth验证

一 背景

一些比较重要的微服务，我们暴露的接口可能会希望安全性更高一些，此时，我们会给这些接口增加一些鉴权，如比较简单且方便的鉴权方式Basic Auth鉴权，此时，针对这些有Basic Auth鉴权的接口，我们该如何写Feign，其实是通过覆盖Feign的默认配置来支持鉴权。

二 具体做法

FeignClient的属性configuration增加自定义配置DemoConfiguration.class

@FeignClient(name = "demo-server", configuration = DemoConfiguration.class)
public interface DemoClient {
    //..
}

DemoConfiguration.class如下(特别注意，别家@Configuration注解，避免扫包扫到导致给全局的Feign都增加了BasicAuthRequestInterceptor拦截器)：

import feign.auth.BasicAuthRequestInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * basic验证配置
 * @author mafgwo
 * @since 2020/09/14
 */
@EnableConfigurationProperties({DemoProperties.class})
public class DemoConfiguration {
    @Autowired
    private DemoProperties demoProperties;

    public DemoConfiguration() {
    }

    @Bean
    public BasicAuthRequestInterceptor basicAuthRequestInterceptor() {
        return new BasicAuthRequestInterceptor(demoProperties.getUsername(), demoProperties.getPassword());
    }
}

其中DemoProperties.java为

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;

/**
 * basic验证配置
 * @author mafgwo
 * @since 2020/09/14
 */
@ConfigurationProperties(prefix = "xxx.demo")
@Data
public class DemoProperties {
    private String username;
    private String password;
}

application.yaml增加basic auth账号密码配置如下：

xxx:
  demo:
    username: test
    password: 123456

三 附上需要的依赖如下

org.springframework.cloud:spring-cloud-starter-openfeign:2.2.4.RELEASE
org.projectlombok:lombok:1.18.12