package com.panzhihua.common.utlis;

import feign.RequestInterceptor;
import feign.RequestTemplate;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import java.util.Enumeration;

/**
 * @author zzj
 */
@Configuration
public class FeignConfig {
    //配置feign拦截器，解决请求头问题
    @Bean("requestInterceptor")
    public RequestInterceptor requestInterceptor() {
        return new RequestInterceptor() {
            //获取所有浏览器发送的请求属性，请求头赋值到feign
            @Override
            public void apply(RequestTemplate requestTemplate) {
                //请求属性
                ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
                if (attributes != null) {
                    HttpServletRequest request = attributes.getRequest();
                    //获取浏览器发起的请求头
                    Enumeration<String> headerNames = request.getHeaderNames();
                    if (headerNames != null) {
                        while (headerNames.hasMoreElements()) {
                            String name = headerNames.nextElement(); //请求头名称 Authorization
                            String value = request.getHeader(name);//请求头数据 "Bearer b1dbb4cf-7de6-41e5-99e2-0e8b7e8fe6ee"
                            // 跳过 content-length，解决too many bites written的问题
                            if (name.equalsIgnoreCase("content-length")){
                                continue;
                            }
                            requestTemplate.header(name, value);
                        }
                    }
                }

            }
        };
    }
}