golang实现京东支付v2版本的示例代码

(编辑：jimmy 日期: 2024/12/24 浏览：2)

一、准备阶段

 pc&h5 接入步骤

官方文档 https://payapi.jd.com/docList...

查看主要接入步骤

密钥生成

"htmlcode"> 

my_rsa_private_pkcs8_key.pem
wy_rsa_public_key.pem

示例程序使用私钥格式为 pkcs8 格式

官方的SDK中的数据可以在示例程序中使用

下载SDK地址 https://payapi.jd.com/docList...

找到接口文档中的Demo

还会用到的包

import (
  "encoding/base64"
  "encoding/json"
  "encoding/xml"
  "errors"
  "fmt"
  "io/ioutil"
  "net/http"
  "os"
  "strconv"
  "strings"
  "time"
)

加密、解密、验证签名

package main
import (
  "bytes"
  "crypto"
  "crypto/des"
  cryptoRand "crypto/rand"
  "crypto/rsa"
  "crypto/sha256"
  "crypto/x509"
  "encoding/base64"
  "encoding/hex"
  "encoding/pem"
  "errors"
  "fmt"
  "math/rand"
  "regexp"
  "sort"
  "strings"
  "time"
)
func randNumber() string {
  return fmt.Sprintf("%05v", rand.New(rand.NewSource(time.Now().UnixNano())).Int31n(100000))
}
func checkSign(decryptBytes []byte, sign, publicKey string) bool {
  decrypt := string(decryptBytes)
  clipStartIndex := strings.Index(decrypt, "<sign>")
  clipEndIndex := strings.Index(decrypt, "</sign>")
  xmlStart := decrypt[0:clipStartIndex]
  xmlEnd := decrypt[clipEndIndex+7 : len(decrypt)]
  originXml := xmlStart + xmlEnd
  //签名校验
  if sign == "" {
    return false
  }
  return checkRsaSign(originXml, publicKey, sign)
}
func replaceXmlStrBlankChar(str string) string {
  str = strings.Replace(str, "\r", "", -1)
  str = strings.Replace(str, "\n", "", -1)
  str = strings.Replace(str, "\t", "", -1)
  reg, _ := regexp.Compile(">\\s+<")
  str = reg.ReplaceAllString(str, "><")
  reg, _ = regexp.Compile("\\s+\\/>")
  str = reg.ReplaceAllString(str, "/>")
  return str
}
func getPaySign(paramMap map[string]string, privateKey string) (string, error) {
  payString := getSortString(paramMap)
  return getRsaSign(payString, privateKey)
}
// ------
// 加密
func encrypt3DES(paramMap map[string]string, desKey string) (map[string]string, error) {
  desKey = base64DecodeStr(desKey)
  for k, v := range paramMap {
    if k == "sign" || k == "merchant" || k == "version" {
      continue
    }
    encrypt, err := tripleEcbDesEncrypt([]byte(v), []byte(desKey))
    if err != nil {
      return paramMap, err
    }
    paramMap[k] = decimalByteSlice2HexString(encrypt)
  }
  return paramMap, nil
}
func decryptArg(notifyQuery NotifyQuery, desKey string) (decryptBytes []byte, err error) {
  desKeyBytes, err := base64.StdEncoding.DecodeString(desKey)
  if err != nil {
    return nil, err
  }
  encryptBytes, err := base64.StdEncoding.DecodeString(notifyQuery.Encrypt)
  if err != nil {
    return nil, err
  }
  encryptBytes, err = hexString2Bytes(string(encryptBytes))
  if err != nil {
    return nil, err
  }
  decryptBytes, err = tripleEcbDesDecrypt(encryptBytes, desKeyBytes)
  if err != nil {
    return nil, err
  }
  return decryptBytes, nil
}
// JDAPP填充规则
func jdPadding(origData []byte) []byte {
  merchantData := len(origData)
  x := (merchantData + 4) % 8
  y := 0
  if x == 0 {
    y = 0
  } else {
    y = 8 - x
  }
  sizeByte := integerToBytes(merchantData)
  var resultByte []byte
  //填充byte数据长度
  for i := 0; i < 4; i++ {
    resultByte = append(resultByte, sizeByte[i])
  }
  //填充原数据长度
  for j := 0; j < merchantData; j++ {
    resultByte = append(resultByte, origData[j])
  }
  //填充0
  for k := 0; k < y; k++ {
    resultByte = append(resultByte, 0x00)
  }
  return resultByte
}
func jdUnPadding(unPaddingResult []byte) []byte {
  var Result []byte
  var dataSizeByte []byte
  for i := 0; i < 4; i++ {
    dataSizeByte = append(dataSizeByte, unPaddingResult[i])
  }
  decimalDataSize := byteArrayToInt(dataSizeByte)
  for j := 0; j < decimalDataSize; j++ {
    Result = append(Result, unPaddingResult[4+j])
  }
  return Result
}
// 字节数组表示的实际长度
func byteArrayToInt(dataSizeByte []byte) int {
  value := 0
  for i := 0; i < 4; i++ {
    shift := byte((4 - 1 - i) * 8)
    value = value + int(dataSizeByte[i]&0x000000FF)<<shift
  }
  return value
}
func integerToBytes(val int) [4]byte {
  byt := [4]byte{}
  byt[0] = byte(val  24 & 0xff)
  byt[1] = byte(val  16 & 0xff)
  byt[2] = byte(val  8 & 0xff)
  byt[3] = byte(val & 0xff)
  return byt
}
// byte转16进制字符串
func decimalByteSlice2HexString(DecimalSlice []byte) string {
  var sa = make([]string, 0)
  for _, v := range DecimalSlice {
    sa = append(sa, fmt.Sprintf("%02X", v))
  }
  ss := strings.Join(sa, "")
  return ss
}
// 十六进制字符串转byte
func hexString2Bytes(str string) ([]byte, error) {
  Bys, err := hex.DecodeString(str)
  if err != nil {
    return nil, err
  }
  return Bys, nil
}
// base解码
func base64DecodeStr(src string) string {
  a, err := base64.StdEncoding.DecodeString(src)
  if err != nil {
    return ""
  }
  return string(a)
}
// Des解密
func decrypt(crypted, key []byte) ([]byte, error) {
  if len(crypted) < 1 || len(key) < 1 {
    return nil, errors.New("wrong data or key")
  }
  block, err := des.NewCipher(key)
  if err != nil {
    return nil, err
  }
  out := make([]byte, len(crypted))
  dst := out
  bs := block.BlockSize()
  if len(crypted)%bs != 0 {
    return nil, errors.New("wrong crypted size")
  }
  for len(crypted) > 0 {
    block.Decrypt(dst, crypted[:bs])
    crypted = crypted[bs:]
    dst = dst[bs:]
  }
  return out, nil
}
// [golang ECB 3DES Decrypt]
func tripleEcbDesDecrypt(crypted, key []byte) ([]byte, error) {
  tkey := make([]byte, 24, 24)
  copy(tkey, key)
  k1 := tkey[:8]
  k2 := tkey[8:16]
  k3 := tkey[16:]
  buf1, err := decrypt(crypted, k3)
  if err != nil {
    return nil, err
  }
  buf2, err := encrypt(buf1, k2)
  if err != nil {
    return nil, err
  }
  out, err := decrypt(buf2, k1)
  if err != nil {
    return nil, err
  }
  out = jdUnPadding(out)
  return out, nil
}
// sha256加密
func hasha256(str string) string {
  h := sha256.New()
  h.Write([]byte(str))
  cipherStr := h.Sum(nil)
  //return cipherStr
  return hex.EncodeToString(cipherStr)
}
// base解编码
func base64EncodeStr(src string) string {
  return base64.StdEncoding.EncodeToString([]byte(src))
}
// 对消息的散列值进行数字签名
func signPKCS1v15(msg, privateKey []byte, hashType crypto.Hash) ([]byte, error) {
  block, _ := pem.Decode(privateKey)
  if block == nil {
    return nil, errors.New("private key format error")
  }
  pri, err := x509.ParsePKCS8PrivateKey(block.Bytes)
  if err != nil {
    return nil, errors.New("parse private key error")
  }
  key, ok := pri.(*rsa.PrivateKey)
  if ok == false {
    return nil, errors.New("private key format error")
  }
  sign, err := rsa.SignPKCS1v15(cryptoRand.Reader, key, hashType, msg)
  if err != nil {
    return nil, errors.New("sign error")
  }
  return sign, nil
}
// Des加密
func encrypt(origData, key []byte) ([]byte, error) {
  if len(origData) < 1 || len(key) < 1 {
    return nil, errors.New("wrong data or key")
  }
  block, err := des.NewCipher(key)
  if err != nil {
    return nil, err
  }
  bs := block.BlockSize()
  if len(origData)%bs != 0 {
    return nil, errors.New("wrong padding")
  }
  out := make([]byte, len(origData))
  dst := out
  for len(origData) > 0 {
    block.Encrypt(dst, origData[:bs])
    origData = origData[bs:]
    dst = dst[bs:]
  }
  return out, nil
}
// [golang ECB 3DES Encrypt]
func tripleEcbDesEncrypt(origData, key []byte) ([]byte, error) {
  tkey := make([]byte, 24, 24)
  copy(tkey, key)
  k1 := tkey[:8]
  k2 := tkey[8:16]
  k3 := tkey[16:]
  origData = jdPadding(origData) // PKCS5Padding(origData, bs)
  buf1, err := encrypt(origData, k1)
  if err != nil {
    return nil, err
  }
  buf2, err := decrypt(buf1, k2)
  if err != nil {
    return nil, err
  }
  out, err := encrypt(buf2, k3)
  if err != nil {
    return nil, err
  }
  return out, nil
}
// ------------
// 验证签名
func verifyPKCS1v15(msg, sign, publicKey []byte, hashType crypto.Hash) bool {
  block, _ := pem.Decode(publicKey)
  if block == nil {
    return false
  }
  pub, err := x509.ParsePKIXPublicKey(block.Bytes)
  if err != nil {
    panic(err)
  }
  err = rsa.VerifyPKCS1v15(pub.(*rsa.PublicKey), hashType, msg, sign)
  return err == nil
}
func getRsaSign(paramStr string, privateKey string) (string, error) {
  sha256Str := hasha256(paramStr)
  sign, err := signPKCS1v15([]byte(sha256Str), []byte(privateKey), crypto.Hash(0))
  if err != nil {
    return "", err
  }
  base64String := base64.StdEncoding.EncodeToString(sign)
  return base64String, nil
}
func checkRsaSign(paramStr string, publicKey, sign string) bool {
  signByte, err := base64.StdEncoding.DecodeString(sign)
  if err != nil {
    return false
  }
  sha256Str := hasha256(paramStr)
  return verifyPKCS1v15([]byte(sha256Str), signByte, []byte(publicKey), crypto.Hash(0))
}
// -------
// 字符串拼接
// 支付字符串拼接
func getSortString(m map[string]string) string {
  var buf bytes.Buffer
  keys := make([]string, 0, len(m))
  for k := range m {
    keys = append(keys, k)
  }
  sort.Strings(keys)
  for _, k := range keys {
    vs := m[k]
    if buf.Len() > 0 {
      buf.WriteByte('&')
    }
    buf.WriteString(k)
    buf.WriteByte('=')
    buf.WriteString(vs)
  }
  return buf.String()
}

程序中加载密钥

func getKey(keyType string) (string, error) {
  keyMap := map[string]string{
    "private_key": "./private.pem",
    "public_key": "./public.pem",
  }
  path, ok := keyMap[keyType]
  if !ok {
    return "", errors.New("key path not exists")
  }
  fileHandler, err := os.Open(path)
  if err != nil {
    return "", err
  }
  defer fileHandler.Close()
  keyBytes, err := ioutil.ReadAll(fileHandler)
  if err != nil {
    return "", err
  }
  return string(keyBytes), nil
}

二、发起支付

常量

常量
const version = "V2.0" // 京东支付版本
const merchantId = "" // 商户id
const desKey = ""   // desc key
const timeLayout = "20060102150405"
const cny = "CNY"
const practicalityGoodsType = "GT01" //商品类型-实物
const businessServiceConsumeCode = "100001"
const practicality = "0" //商品类型-实物

调用在线支付接口

pc h5 发起支付

官方文档 https://payapi.jd.com/docList...

type Order struct {
  OrderId     string        `json:"order_id"`
  Amount     float64        `json:"amount"`
  Items      []*OrderItem     `json:"items"`
  ShippingAddress *OrderShippingAddress `json:"shipping_address"`
}
type OrderItem struct {
  GoodsNo  string `json:"goods_no"`
  GoodsName string `json:"goods_name"`
  GoodsPrice float64 `json:"goods_price"`
  GoodsNum  uint32 `json:"goods_num"`
}
type OrderShippingAddress struct {
  Name   string `json:"name"`
  Mobile  string `json:"mobile"`
  Address string `json:"address"`
  Province string `json:"province"`
  City   string `json:"city"`
  Country string `json:"country"`
}
type ReqWithEncrypt struct {
  XMLName xml.Name `xml:"jdpay" json:"-"`
  Version string  `xml:"version" json:"version"`  //版本
  Merchant string  `xml:"merchant" json:"merchant"` //商户号
  Encrypt string  `xml:"encrypt" json:"encrypt"`  //加密数据
}
const version = "V2.0" // 京东支付版本
const merchantId = "22294531"
const desKey = "ta4E/aspLA3lgFGKmNDNRYU92RkZ4w2t"
const timeLayout = "20060102150405"
const cny = "CNY"
const practicalityGoodsType = "GT01" //商品类型-实物
const businessServiceConsumeCode = "100001"
const practicality = "0" //商品类型-实物
type GoodsInfo struct {
  Id  string `json:"id"`  //商品编号
  Name string `json:"name"` //商品名称
  Price int64 `json:"price"` //商品单价，单位分
  Num  uint32 `json:"num"`  //商品数量
  Type string `json:"type"` //商品类型
}
type ReceiverInfo struct {
  Name   string `json:"name"`
  Address string `json:"address"`
  Mobile  string `json:"mobile"`
  Province string `json:"province"`
  City   string `json:"city"`
  Country string `json:"country"`
}
type KjInfo struct {
  GoodsSubmittedCustoms string `json:"goodsSubmittedCustoms"` // 是否报关Y/N
  GoodsUnderBonded   string `json:"goodsUnderBonded"`   // 是否保税货物项下付款Y/N
}
const jdPayUrl = "https://wepay.jd.com/jdpay/saveOrder"
// pc h5 form 表单提交支付
func postFormPay(arg Order) (payStr string, err error) {
  // 支付参数
  paramMap := make(map[string]string)
  amountStr := fmt.Sprintf("%.f", arg.Amount*100)
  totalFee, err := strconv.ParseInt(amountStr, 10, 64)
  if err != nil {
    return payStr, err
  }
  var goodsInfos []GoodsInfo
  for _, v := range arg.Items {
    priceStr := fmt.Sprintf("%.f", v.GoodsPrice*100)
    price, err := strconv.ParseInt(priceStr, 10, 64)
    if err != nil {
      return payStr, err
    }
    goodsInfos = append(goodsInfos, GoodsInfo{
      Id:  v.GoodsNo,
      Name: v.GoodsName,
      Price: price,
      Num:  v.GoodsNum,
      Type: practicalityGoodsType, // 商品类型-实物
    })
  }
  goodsInfoBytes, _ := json.Marshal(goodsInfos)
  kjInfo := KjInfo{GoodsSubmittedCustoms: "N", GoodsUnderBonded: "N"}
  kjInfoBytes, _ := json.Marshal(kjInfo)
  detailAddress := arg.ShippingAddress.Province + arg.ShippingAddress.City + arg.ShippingAddress.Country + arg.ShippingAddress.Address
  receiverInfo := ReceiverInfo{
    Name:   arg.ShippingAddress.Name,   // 收货人姓名
    Mobile:  arg.ShippingAddress.Mobile,  // 收货人手机号
    Address: detailAddress,        // 地址要求包过省市区
    Province: arg.ShippingAddress.Province, // 省
    City:   arg.ShippingAddress.City,   // 市
    Country: arg.ShippingAddress.Country, // 区
  }
  receiverInfoBytes, _ := json.Marshal(receiverInfo)
  orderId := fmt.Sprintf("test%s%s", time.Now().Format("20060102150405"), randNumber())
  paramMap["version"] = version
  paramMap["merchant"] = merchantId
  paramMap["tradeNum"] = orderId  // 订单号
  paramMap["tradeName"] = orderId // 订单描述
  paramMap["tradeDesc"] = orderId // 订单描述
  paramMap["payMerchant"] = "test" // 商户名称
  paramMap["tradeTime"] = time.Now().Format(timeLayout)
  paramMap["amount"] = fmt.Sprintf("%v", totalFee)
  paramMap["orderType"] = practicality
  paramMap["currency"] = cny
  paramMap["userId"] = "100"
  paramMap["expireTime"] = "3600" //订单失效时长，单位秒
  paramMap["goodsInfo"] = string(goodsInfoBytes)
  paramMap["settleCurrency"] = cny
  paramMap["kjInfo"] = string(kjInfoBytes)
  paramMap["bizTp"] = businessServiceConsumeCode
  paramMap["notifyUrl"] = "http://tools.localhost/notify"
  paramMap["callbackUrl"] = "http://tools.localhost/verify"
  paramMap["receiverInfo"] = string(receiverInfoBytes)
  // 证书
  privateKey, err := getKey("private_key")
  if err != nil {
    return payStr, err
  }
  // 签名
  paramMap["sign"], err = getPaySign(paramMap, privateKey)
  if err != nil {
    return payStr, err
  }
  // 数据加密
  paramMap, err = encrypt3DES(paramMap, desKey)
  if err != nil {
    return payStr, err
  }
  // 拼接支付表单
  payStr = "<form action='" + jdPayUrl + "' method='post' id='pay_form'>"
  for k, v := range paramMap {
    payStr += "<input value='" + v + "' name='" + k + "' type='hidden'/>"
  }
  payStr += "</form>"
  payStr += "<script>var form = document.getElementById('pay_form');form.submit()</script>"
  return payStr, nil
}

三、异步通知

数据解密、签名校验

// 异步通知信息解密
type NotifyQuery struct {
  XMLName xml.Name   `xml:"jdpay" json:"-"`
  Version string    `xml:"version" json:"version"`  // 版本号
  Merchant string    `xml:"merchant" json:"merchant"` // 商户号
  Result  NotifyResult `xml:"result" json:"result"`   // 交易结果
  Encrypt string    `xml:"encrypt" json:"encrypt"`  // 加密信息
}
type NotifyDecrypt struct {
  XMLName  xml.Name   `xml:"jdpay" json:"-"`
  Version  string    `xml:"version" json:"version"`   // 版本号
  Merchant string    `xml:"merchant" json:"merchant"`  // 商户号
  Result  NotifyResult `xml:"result" json:"result"`    // 交易结果
  TradeNum string    `xml:"tradeNum" json:"tradeNum"`  // 订单号
  TradeType int      `xml:"tradeType" json:"tradeType"` // 交易类型
  Sign   string    `xml:"sign" json:"sign"`      // 数据签名
  Amount  int64     `xml:"amount" json:"amount"`    // 人民币支付总金额
  OrderId  string    `json:"order_id"`         // 京东交易流水号
  Status  string    `xml:"status" json:"status"`    // 交易状态
  PayList  NotifyPayList `xml:"payList" json:"payList"`   // 支付方式明细
}
type NotifyResult struct {
  Code string `xml:"code" json:"code"` // 交易返回码
  Desc string `xml:"desc" json:"desc"` // 返回码信息
}
type NotifyPayList struct {
  Pay []NotifyPay `xml:"pay" json:"pay"`
}
type NotifyPay struct {
  PayType  int  `xml:"payType" json:"payType"`   // 支付方式
  Amount  int64 `xml:"amount" json:"amount"`    // 交易金额
  Currency string `xml:"currency" json:"currency"`  // 交易币种
  TradeTime string `xml:"tradeTime" json:"tradeTime"` // 交易时间
}
// 异步通知信息解密
func notifyDataDecrypt(rawPost string) (notifyDecrypt NotifyDecrypt, err error) {
  // 解析加密的支付机构参数为结构体
  var notifyQuery NotifyQuery
  err = xml.Unmarshal([]byte(rawPost), &notifyQuery)
  if err != nil {
    return notifyDecrypt, err
  }
  // 解密支付机构参数
  decryptBytes, err := decryptArg(notifyQuery, desKey)
  if err != nil {
    return notifyDecrypt, err
  }
  // 解析解密后的支付机构参数为结构体
  err = xml.Unmarshal(decryptBytes, &notifyDecrypt)
  if err != nil {
    return notifyDecrypt, err
  }
  // 证书
  publicKey, err := getKey("public_key")
  if err != nil {
    return notifyDecrypt, err
  }
  // 校验签名
  if !checkSign(decryptBytes, notifyDecrypt.Sign, publicKey) {
    return notifyDecrypt, err
  }
  return notifyDecrypt, nil
}

四、交易查询

查询订单

type SearchWithoutSignRequest struct {
  XMLName  xml.Name `xml:"jdpay" json:"-"`
  Version  string  `xml:"version" json:"version"`   // 版本
  Merchant string  `xml:"merchant" json:"merchant"`  // 商户号
  TradeNum string  `xml:"tradeNum" json:"tradeNum"`  // 订单编号
  OTradeNum string  `xml:"oTradeNum" json:"oTradeNum"` // 原交易流水号
  TradeType string  `xml:"tradeType" json:"tradeType"` // 交易类型
}
type SearchWithSignRequest struct {
  XMLName  xml.Name `xml:"jdpay" json:"-"`
  Version  string  `xml:"version" json:"version"`   // 版本
  Merchant string  `xml:"merchant" json:"merchant"`  // 商户号
  TradeNum string  `xml:"tradeNum" json:"tradeNum"`  // 订单编号
  OTradeNum string  `xml:"oTradeNum" json:"oTradeNum"` // 原交易流水号
  TradeType string  `xml:"tradeType" json:"tradeType"` // 交易类型
  Sign   string  `xml:"sign" json:"sign"`      // 签名
}
type SearchResult struct {
  XMLName xml.Name    `xml:"jdpay" json:"-"`
  Version string     `xml:"version" json:"version"`  // 版本号
  Merchant string     `xml:"merchant" json:"merchant"` // 商户号
  Result  SearchResultRsp `xml:"result" json:"result"`   // 交易结果
  Encrypt string     `xml:"encrypt" json:"encrypt"`  // 加密信息
}
type SearchResultRsp struct {
  Code string `xml:"code" json:"code"` // 交易返回码
  Desc string `xml:"desc" json:"desc"` // 返回码信息
}
type SearchDecryptRsp struct {
  XMLName  xml.Name     `xml:"jdpay" json:"-"`
  Merchant string      `xml:"merchant" json:"merchant"`  // 商户号
  TradeNum string      `xml:"tradeNum" json:"tradeNum"`  // 订单编号
  TradeType string      `xml:"tradeType" json:"tradeType"` // 交易类型
  Result  SearchResultRsp `xml:"result" json:"result"`    // 交易结果
  Sign   string      `xml:"sign" json:"sign"`      // 数据签名
  Amount  int64      `xml:"amount" json:"amount"`    // 人民币支付总金额
  Status  string      `xml:"status" json:"status"`    // 交易状态
  PayList  SearchPayListRsp `xml:"payList" json:"payList"`   // 支付方式明细
}
type SearchPayListRsp struct {
  Pay []SearchPayRsp `xml:"pay" json:"pay"`
}
type SearchPayRsp struct {
  PayType  int  `xml:"payType" json:"payType"`   // 支付方式
  Amount  int64 `xml:"amount" json:"amount"`    // 交易金额
  Currency string `xml:"currency" json:"currency"`  // 交易币种
  TradeTime string `xml:"tradeTime" json:"tradeTime"` // 交易时间
}
const tradeWayUrl = "https://paygate.jd.com/service/query"
const customTradeType = "0" // 交易类型
const successCode = "000000"
func searchTrade(orderId string) (searchDecryptRsp SearchDecryptRsp, err error) {
  searchWithoutSignRequest := SearchWithoutSignRequest{
    Version:  version,
    Merchant: merchantId,
    TradeNum: orderId,
    OTradeNum: "",
    TradeType: customTradeType,
  }
  xmlBytes, err := xml.Marshal(searchWithoutSignRequest)
  xmlStr := xml.Header + string(xmlBytes)
  xmlStr = replaceXmlStrBlankChar(xmlStr)
  // 证书
  privateKey, err := getKey("private_key")
  if err != nil {
    return searchDecryptRsp, err
  }
  // 签名
  sign, err := getRsaSign(xmlStr, privateKey)
  if err != nil {
    return searchDecryptRsp, err
  }
  searchWithSignRequest := SearchWithSignRequest{
    Version:  searchWithoutSignRequest.Version,
    Merchant: searchWithoutSignRequest.Merchant,
    TradeNum: searchWithoutSignRequest.TradeNum,
    OTradeNum: searchWithoutSignRequest.OTradeNum,
    TradeType: searchWithoutSignRequest.TradeType,
    Sign:   sign,
  }
  xmlBytes, err = xml.Marshal(searchWithSignRequest)
  xmlStr = strings.TrimRight(xml.Header, "\n") + string(xmlBytes)
  desKeyBytes, err := base64.StdEncoding.DecodeString(desKey)
  if err != nil {
    return searchDecryptRsp, err
  }
  encryptBytes, err := tripleEcbDesEncrypt([]byte(xmlStr), desKeyBytes)
  if err != nil {
    return searchDecryptRsp, err
  }
  reqEncrypt := decimalByteSlice2HexString(encryptBytes)
  reqEncrypt = base64.StdEncoding.EncodeToString([]byte(reqEncrypt))
  searchWithEncrypt := ReqWithEncrypt{
    Version: version,
    Merchant: merchantId,
    Encrypt: reqEncrypt,
  }
  xmlBytes, err = xml.Marshal(searchWithEncrypt)
  if err != nil {
    return searchDecryptRsp, err
  }
  xmlStr = strings.TrimRight(xml.Header, "\n") + string(xmlBytes)
  request, err := http.NewRequest(http.MethodPost, tradeWayUrl, strings.NewReader(xmlStr))
  if err != nil {
    return searchDecryptRsp, err
  }
  request.Header.Add("content-type", "application/xml; charset=utf-8")
  client := http.DefaultClient
  response, err := client.Do(request)
  if err != nil {
    return searchDecryptRsp, err
  }
  defer response.Body.Close()
  bodyBytes, err := ioutil.ReadAll(response.Body)
  if err != nil {
    return searchDecryptRsp, err
  }
  searchResult := new(SearchResult)
  if err = xml.Unmarshal(bodyBytes, searchResult); err != nil {
    return searchDecryptRsp, err
  }
  if searchResult.Result.Code != successCode {
    return searchDecryptRsp, errors.New(searchResult.Result.Desc)
  }
  // 解密数据
  rspEncryptBytes, err := base64.StdEncoding.DecodeString(searchResult.Encrypt)
  rspEncryptBytes, err = hexString2Bytes(string(rspEncryptBytes))
  if err != nil {
    return searchDecryptRsp, err
  }
  rspDecryptBytes, err := tripleEcbDesDecrypt(rspEncryptBytes, desKeyBytes)
  if err != nil {
    return searchDecryptRsp, err
  }
  err = xml.Unmarshal(rspDecryptBytes, &searchDecryptRsp)
  if err != nil {
    return searchDecryptRsp, err
  }
  // 证书
  publicKey, err := getKey("public_key")
  if err != nil {
    return searchDecryptRsp, err
  }
  // 校验签名
  if !checkSign(rspDecryptBytes, searchDecryptRsp.Sign, publicKey) {
    return searchDecryptRsp, err
  }
  return searchDecryptRsp, nil
}

五、申请退款

申请退款

// 退款
type Refund struct {
  Merchant  string `json:"merchant"`
  TradeNum  string `json:"tradeNum"`
  OTradeNum string `json:"oTradeNum"`
  Amount   uint64 `json:"amount"`
  Currency  string `json:"currency"`
  DesKey   string `json:"desKey"`
  PublicKey string `json:"publicKey"`
  PrivateKey string `json:"privateKey"`
}
type RefundReqWithoutSign struct {
  XMLName  xml.Name `xml:"jdpay" json:"-"`
  Version  string  `xml:"version" json:"version"`
  Merchant string  `xml:"merchant" json:"merchant"`
  TradeNum string  `xml:"tradeNum" json:"tradeNum"`
  OTradeNum string  `xml:"oTradeNum" json:"oTradeNum"`
  Amount  uint64  `xml:"amount" json:"amount"`
  Currency string  `xml:"currency" json:"currency"`
}
type RefundReqWithSign struct {
  XMLName  xml.Name `xml:"jdpay" json:"-"`
  Version  string  `xml:"version" json:"version"`
  Merchant string  `xml:"merchant" json:"merchant"`
  TradeNum string  `xml:"tradeNum" json:"tradeNum"`
  OTradeNum string  `xml:"oTradeNum" json:"oTradeNum"`
  Amount  uint64  `xml:"amount" json:"amount"`
  Currency string  `xml:"currency" json:"currency"`
  Sign   string  `xml:"sign" json:"sign"`
}
type RefundResult struct {
  XMLName xml.Name      `xml:"jdpay" json:"-"`
  Version string       `xml:"version" json:"version"`  // 版本号
  Merchant string       `xml:"merchant" json:"merchant"` // 商户号
  Result  RefundPayResultRsp `xml:"result" json:"result"`   // 退款结果
  Encrypt string       `xml:"encrypt" json:"encrypt"`  // 加密信息
}
type RefundPayResultRsp struct {
  Code string `xml:"code" json:"code"` // 交易返回码
  Desc string `xml:"desc" json:"desc"` // 返回码信息
}
type RefundPayDecryptRsp struct {
  XMLName  xml.Name      `xml:"jdpay" json:"-"`
  Version  string       `xml:"version" json:"version"`  // 版本号
  Merchant string       `xml:"merchant" json:"merchant"` // 商户号
  TradeNum string       `xml:"tradeNum" json:"tradeNum"`
  TradeType string       `xml:"tradeType"json:"tradeType"`
  Result  RefundPayResultRsp `xml:"result" json:"result"` // 退款结果
  Sign   string       `xml:"sign" json:"sign"`
  Amount  uint64       `xml:"amount" json:"amount"`
  Currency string       `xml:"currency" json:"currency"`
  TradeTime string       `xml:"tradeTime" json:"tradeTime"`
  Status  string       `xml:"status" json:"status"`
}
const refundGatewayUrl = "https://paygate.jd.com/service/refund"
// 申请退款
func refundTrade(orderId string, amount float64) (refundPayDecryptRsp RefundPayDecryptRsp, err error) {
  totalFee, err := strconv.ParseUint(fmt.Sprintf("%.f", amount*100), 10, 64)
  if err != nil {
    return refundPayDecryptRsp, err
  }
  refundReqWithoutSign := RefundReqWithoutSign{
    Version:  version,
    Merchant: merchantId,
    TradeNum: orderId + "-1",
    OTradeNum: orderId,
    Amount:  totalFee,
    Currency: cny,
  }
  xmlBytes, err := xml.Marshal(refundReqWithoutSign)
  xmlStr := xml.Header + string(xmlBytes)
  xmlStr = replaceXmlStrBlankChar(xmlStr)
  // 证书
  privateKey, err := getKey("private_key")
  if err != nil {
    return refundPayDecryptRsp, err
  }
  // 签名
  sign, err := getRsaSign(xmlStr, privateKey)
  if err != nil {
    return refundPayDecryptRsp, err
  }
  refundReqWithSign := RefundReqWithSign{
    Version:  refundReqWithoutSign.Version,
    Merchant: refundReqWithoutSign.Merchant,
    TradeNum: refundReqWithoutSign.TradeNum,
    OTradeNum: refundReqWithoutSign.OTradeNum,
    Amount:  refundReqWithoutSign.Amount,
    Currency: refundReqWithoutSign.Currency,
    Sign:   sign,
  }
  xmlBytes, err = xml.Marshal(refundReqWithSign)
  xmlStr = strings.TrimRight(xml.Header, "\n") + string(xmlBytes)
  desKeyBytes, err := base64.StdEncoding.DecodeString(desKey)
  if err != nil {
    return refundPayDecryptRsp, err
  }
  encryptBytes, err := tripleEcbDesEncrypt([]byte(xmlStr), desKeyBytes)
  if err != nil {
    return refundPayDecryptRsp, err
  }
  reqEncrypt := decimalByteSlice2HexString(encryptBytes)
  reqEncrypt = base64.StdEncoding.EncodeToString([]byte(reqEncrypt))
  refundReqWithEncrypt := ReqWithEncrypt{
    Version: version,
    Merchant: merchantId,
    Encrypt: reqEncrypt,
  }
  xmlBytes, err = xml.Marshal(refundReqWithEncrypt)
  xmlStr = strings.TrimRight(xml.Header, "\n") + string(xmlBytes)
  request, err := http.NewRequest(http.MethodPost, refundGatewayUrl, strings.NewReader(xmlStr))
  if err != nil {
    return refundPayDecryptRsp, err
  }
  request.Header.Add("content-type", "application/xml; charset=utf-8")
  client := http.DefaultClient
  response, err := client.Do(request)
  if err != nil {
    return refundPayDecryptRsp, err
  }
  defer response.Body.Close()
  bodyBytes, err := ioutil.ReadAll(response.Body)
  if err != nil {
    return refundPayDecryptRsp, err
  }
  refundResult := new(RefundResult)
  if err = xml.Unmarshal(bodyBytes, refundResult); err != nil {
    return refundPayDecryptRsp, err
  }
  // 解密数据
  rspEncryptBytes, err := base64.StdEncoding.DecodeString(refundResult.Encrypt)
  if err != nil {
    return refundPayDecryptRsp, err
  }
  rspEncryptBytes, err = hexString2Bytes(string(rspEncryptBytes))
  if err != nil {
    return refundPayDecryptRsp, err
  }
  rspDecryptBytes, err := tripleEcbDesDecrypt(rspEncryptBytes, desKeyBytes)
  if err != nil {
    return refundPayDecryptRsp, err
  }
  err = xml.Unmarshal(rspDecryptBytes, &refundPayDecryptRsp)
  if err != nil {
    return refundPayDecryptRsp, err
  }
  
  // 证书
  publicKey, err := getKey("public_key")
  if err != nil {
    return refundPayDecryptRsp, err
  }
  // 校验签名
  if !checkSign(rspDecryptBytes, refundPayDecryptRsp.Sign, publicKey) {
    return refundPayDecryptRsp, err
  }
  
  return refundPayDecryptRsp, nil
}
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