main.go

package main

/**
	@author： ECH2O
	@time： 2018-7-4 14:37:14
	@tip： access_token 有效期限为一年
 */

import (
	"net/http"
	"fmt"
	"net/url"
	"strings"
	"io/ioutil"
	"encoding/json"
	"time"
)

func main() {

	http.HandleFunc("/openlink", JDRender)

	http.ListenAndServe(":8989", nil);
}

type JDConfig struct {
	access_token string
	app_key      string
	method       string
	sgin         string
}

func conf() JDConfig {
	return JDConfig{
		"d485f611-7d1f-49d5-97a9-d5ac5450c659",
		"8E76F960FE21B40A83B167F22223759C",
		"jingdong.wxsq.mjgj.link.GetOpenLink",
		"35D5AA4F312FD08D8070B951105A8D9C",
	}
}

func JDRender(w http.ResponseWriter, r *http.Request) {

	r.ParseForm()
	jdUrl := r.Form.Get("url")
	_, err := url.ParseRequestURI(jdUrl)
	if err != nil || !strings.Contains(jdUrl, "jd.com") {
		errInfo := `{"errcode":-1,"message":"不支持的资源域名 Only => *.jd.com"}`
		fmt.Fprintf(w, errInfo)
		return
	} else {
		jdRurl := url.QueryEscape(strings.Split(jdUrl, ":")[1])
		data := url.Values{"jump": {"0"}, "rurl": {url.QueryEscape("http://dc2.jd.com/auto.php?service=transfer&type=pms&to=" + jdRurl + "&openlink=1")}}
		body := strings.NewReader(data.Encode())
		clt := http.Client{}
		resp, err := clt.Post(JDApi(), "application/x-www-form-urlencoded", body)
		if err != nil {
			fmt.Print(err.Error())
			return
		}
		content, err := ioutil.ReadAll(resp.Body)
		respBody := string(content)
		var dat map[string]interface{}
		if err := json.Unmarshal([]byte(respBody), &dat); err == nil {
			r, _ := json.Marshal(dat["jingdong_wxsq_mjgj_link_GetOpenLink_responce"])
			if err := json.Unmarshal(r, &dat); err == nil {
				r, _ := json.Marshal(dat["open_link_result"])
				fmt.Fprintf(w, string(r))
			}
		}
	}
	fmt.Print("\r\n访问者ip：" + r.Header.Get("X-Real-Ip") + strings.Split(r.RemoteAddr, ":")[0])

}

func JDApi() string {
	return "https://api.jd.com/routerjson?access_token=" + conf().access_token +
		   "&app_key=" + conf().app_key +
		   	"&method=" + conf().method +
				"&v=2.0&sign=" + conf().sgin +
					"&timestamp=" + string(time.Now().Unix())
}