golang 企业转账到零钱

package main

import (
    "bytes"
    "crypto/md5"
    "crypto/tls"
    "encoding/hex"
    "encoding/xml"
    "fmt"
    "io/ioutil"
    "net/http"
    "net/url"
    "strconv"
    "strings"
)


var transfers = "https://api.mch.weixin.qq.com/mmpaymkttransfers/promotion/transfers"
var KEY = "DJ2E5nA9xjxTQlj4AAWNsF5EJQY12sPA"

//付款订单
type WithdrawOrder struct {
    XMLName        xml.Name `xml:"xml"`
    MchAppid       string   `xml:"mch_appid"`
    Mchid          string   `xml:"mchid"`
    DeviceInfo     string   `xml:"device_info"`
    NonceStr       string   `xml:"nonce_str"`
    Sign           string   `xml:"sign"`
    PartnerTradeNo string   `xml:"partner_trade_no"`
    Openid         string   `xml:"openid"`
    CheckName      string   `xml:"check_name"`
    Amount         int      `xml:"amount"`
    Desc           string   `xml:"desc"`
    SpbillCreateIp string   `xml:"spbill_create_ip"`
}

//付款订单结果
type WithdrawResult struct {
    ReturnCode     string `xml:"return_code"`
    ReturnMsg      string `xml:"return_msg"`
    ResultCode     string `xml:"result_code"`
    ErrCodeDes     string `xml:"err_code_des"`
    PaymentNo      string `xml:"payment_no"`
    PartnerTradeNo string `xml:"partner_trade_no"`
}

//付款，成功返回自定义订单号，微信订单号，true，失败返回错误信息，false
func WithdrawMoney(appid, mchid, openid, amount, partnerTradeNo, desc, clientIp string) (string, string, bool) {
    order := WithdrawOrder{}
    order.MchAppid = appid
    order.Mchid = mchid
    order.Openid = openid
    order.Amount, _ = strconv.Atoi(amount)
    order.Desc = desc
    order.PartnerTradeNo = partnerTradeNo
    order.DeviceInfo = "WEB"
    order.CheckName = "NO_CHECK" //NO_CHECK：不校验真实姓名 FORCE_CHECK：强校验真实姓名
    order.SpbillCreateIp = clientIp
    order.NonceStr = "5K8264ILTKCH16CQ2502SI8ZNMTM67VS"
    //GetRandomString(32)
    order.Sign = strings.ToUpper(md5WithdrawOrder(order))
    xmlBody, _ := xml.MarshalIndent(order, " ", " ")
    resp, err := SecurePost(transfers, xmlBody)
    if err != nil {
        return err.Error(), "解析文件错误", false
    }
    defer resp.Body.Close()
    bodyByte, _ := ioutil.ReadAll(resp.Body)
    var res WithdrawResult
    xmlerr := xml.Unmarshal(bodyByte, &res)
    if xmlerr != nil {
        return xmlerr.Error(), "", false
    }
    if res.ReturnCode == "SUCCESS" && res.ResultCode == "SUCCESS" {
        return res.PartnerTradeNo, res.PaymentNo, true
    }
    return res.ReturnMsg, res.ErrCodeDes, false

}
func Md5Str(str string) string {
    var hashSign []byte
    hash := md5.New()
    hash.Write([]byte(str))
    hashSign = hash.Sum(nil)
    return hex.EncodeToString(hashSign)
}

//md5签名
func md5WithdrawOrder(order WithdrawOrder) string {
    o := url.Values{}
    o.Add("mch_appid", order.MchAppid)
    o.Add("mchid", order.Mchid)
    o.Add("device_info", order.DeviceInfo)
    o.Add("partner_trade_no", order.PartnerTradeNo)
    o.Add("check_name", order.CheckName)
    o.Add("amount", strconv.Itoa(order.Amount))
    o.Add("spbill_create_ip", order.SpbillCreateIp)
    o.Add("desc", order.Desc)
    o.Add("nonce_str", order.NonceStr)
    o.Add("openid", order.Openid)
    r, _ := url.QueryUnescape(o.Encode())
    return Md5Str(r + "&key=" + KEY)

}

//ca证书的位置，需要绝对路径
var (
    wechatCertPath = `D:/kernel/utils/WeChat/1516803781_20220721_cert/apiclient_cert.pem`
    wechatKeyPath  = `D:/kernel/utils/WeChat/1516803781_20220721_cert/apiclient_key.pem`
)
var _tlsConfig *tls.Config

//采用单例模式初始化ca
func getTLSConfig() (*tls.Config, error) {
    if _tlsConfig != nil {
        return _tlsConfig, nil
    }
    // load cert
    cert, err := tls.LoadX509KeyPair(wechatCertPath, wechatKeyPath)
    if err != nil {
        return nil, err
    }
    _tlsConfig = &tls.Config{
        Certificates: []tls.Certificate{cert},
    }
    return _tlsConfig, nil
}

//携带ca证书的安全请求
func SecurePost(url string, xmlContent []byte) (*http.Response, error) {
    tlsConfig, err := getTLSConfig()
    if err != nil {
        return nil, err
    }
    tr := &http.Transport{TLSClientConfig: tlsConfig}
    client := &http.Client{Transport: tr}
    return client.Post(
        url,
        "application/xml",
        bytes.NewBuffer(xmlContent))
}
func main() {
    mch_appid := "14412142"
    mchid := "124412412"
    openid := "4124412"
    //v2:="4124214142"
    //mchAPIv3Key:= "124412142142"
    partner_trade_no := "10000098201411111234567890"
    amount := "30"
    desc := "3699"
    clientIp := "192.168.0.1"
    re, que, st := WithdrawMoney(mch_appid, mchid, openid, amount, partner_trade_no, desc, clientIp)
    fmt.Println(re, "1")
    fmt.Println(que, "2")
    fmt.Println(st, "3")
}