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golang实现微信支付v3版本的方法

时间：2021-03-31 01:07     来源/作者：Go语言中文网

 

一、准备阶段

 

 获取私钥

官方文档 https://kf.qq.com/faq/161222N...

获取私钥证书的序列号 https://pay.weixin.qq.com/wik...

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openssl x509 -in 1900009191_20180326_cert.pem -noout -serial
serial=1DDE55AD98ED71D6EDD4A4A16996DE7B47773A8C

私钥获取后有三个文件

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apiclient_key.p12
apiclient_cert.pem
apiclient_key.pem

本次示例程序中，使用的是文件 apiclient_key.pem内容

获取公钥(平台证书)

官方文档

更新证书 https://pay.weixin.qq.com/wik...

平台证书会提前10天生成新证书，微信官方推荐在旧证书过期前5-10天部署新证书

获取证书API文档 https://pay.weixin.qq.com/wik...

身份证认证信息生成文档 https://pay.weixin.qq.com/wik...

常量

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const appId = ""   // 小程序或者公众号的appid
const mchId = ""   // 微信支付的商户id
const privateSerialNo = "" // 私钥证书号
const aesKey = ""   // 微信支付aes key

生成数字签名

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// 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 decode 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
}
// base编码
func base64EncodeStr(src []byte) string {
 return base64.StdEncoding.EncodeToString(src)
}

生成身份认证信息

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func authorization(method string, paramMap map[string]interface{}, rawUrl string) (token string, err error) {
 var body string
 if len(paramMap) != 0 {
  paramJsonBytes, err := json.Marshal(paramMap)
  if err != nil {
   return token, err
  }
  body = string(paramJsonBytes)
 }
 urlPart, err := url.Parse(rawUrl)
 if err != nil {
  return token, err
 }
 canonicalUrl := urlPart.RequestURI()
 timestamp := time.Now().Unix()
 nonce := getRandomString(32)
 message := fmt.Sprintf("%s\n%s\n%d\n%s\n%s\n", method, canonicalUrl, timestamp, nonce, body)
 open, err := os.Open("/Users/apple/data/www/go/work/src/study/testwechantpay/private.pem")
 if err != nil {
  return token, err
 }
 defer open.Close()
 privateKey, err := ioutil.ReadAll(open)
 if err != nil {
  return token, err
 }
 signBytes, err := signPKCS1v15(hasha256(message), privateKey, crypto.SHA256)
 if err != nil {
  return token, err
 }
 sign := base64EncodeStr(signBytes)
 token = fmt.Sprintf("mchid=\"%s\",nonce_str=\"%s\",timestamp=\"%d\",serial_no=\"%s\",signature=\"%s\"",
  mchId, nonce, timestamp, privateSerialNo, sign)
 return token, nil
}

报文解密

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func decryptGCM(aesKey, nonceV, ciphertextV, additionalDataV string) ([]byte, error) {
 key := []byte(aesKey)
 nonce := []byte(nonceV)
 additionalData := []byte(additionalDataV)
 ciphertext, err := base64.StdEncoding.DecodeString(ciphertextV)
 if err != nil {
  return nil, err
 }
 block, err := aes.NewCipher(key)
 if err != nil {
  return nil, err
 }
 aesGCM, err := cipher.NewGCM(block)
 if err != nil {
  return nil, err
 }
 plaintext, err := aesGCM.Open(nil, nonce, ciphertext, additionalData)
 if err != nil {
  return nil, err
 }
 return plaintext, err
}

获取平台证书

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// 获取公钥
const publicKeyUrl = "https://api.mch.weixin.qq.com/v3/certificates"
type TokenResponse struct {
 Data []TokenResponseData `json:"data"`
}
type TokenResponseData struct {
 EffectiveTime  string    `json:"effective_time"`
 EncryptCertificate EncryptCertificate `json:"encrypt_certificate"`
 ExpireTime   string    `json:"expire_time"`
 SerialNo   string    `json:"serial_no"`
}
type EncryptCertificate struct {
 Algorithm  string `json:"algorithm"`
 AssociatedData string `json:"associated_data"`
 Ciphertext  string `json:"ciphertext"`
 Nonce   string `json:"nonce"`
}
var publicSyncMap sync.Map
// 获取公钥
func getPublicKey() (key string, err error) {
 var prepareTime int64 = 24 * 3600 * 3 // 证书提前三天过期旧证书，获取新证书
 nowTime := time.Now().Unix()
 // 读取公钥缓存数据
 cacheValueKey := fmt.Sprintf("app_id:%s:public_key:value", appId)
 cacheExpireTimeKey := fmt.Sprintf("app_id:%s:public_key:expire_time", appId)
 cacheValue, keyValueOk := publicSyncMap.Load(cacheValueKey)
 cacheExpireTime, expireTimeOk := publicSyncMap.Load(cacheExpireTimeKey)
 if keyValueOk && expireTimeOk {
  // 格式化时间
  local, _ := time.LoadLocation("Local")
  location, _ := time.ParseInLocation(time.RFC3339, cacheExpireTime.(string), local)
  // 判断是否过期，证书没有过期直接返回
  if location.Unix()-prepareTime > nowTime {
   return cacheValue.(string), nil
  }
 }
 token, err := authorization(http.MethodGet, nil, publicKeyUrl)
 if err != nil {
  return key, err
 }
 request, err := http.NewRequest(http.MethodGet, publicKeyUrl, nil)
 if err != nil {
  return key, err
 }
 request.Header.Add("Authorization", "WECHATPAY2-SHA256-RSA2048 "+token)
 request.Header.Add("User-Agent", "用户代理(https://zh.wikipedia.org/wiki/User_agent)")
 request.Header.Add("Content-type", "application/json;charset='utf-8'")
 request.Header.Add("Accept", "application/json")
 client := http.DefaultClient
 response, err := client.Do(request)
 if err != nil {
  return key, err
 }
 defer response.Body.Close()
 bodyBytes, err := ioutil.ReadAll(response.Body)
 if err != nil {
  return key, err
 }
 //fmt.Println(string(bodyBytes))
 var tokenResponse TokenResponse
 if err = json.Unmarshal(bodyBytes, &tokenResponse); err != nil {
  return key, err
 }
 for _, encryptCertificate := range tokenResponse.Data {
  // 格式化时间
  local, _ := time.LoadLocation("Local")
  location, err := time.ParseInLocation(time.RFC3339, encryptCertificate.ExpireTime, local)
  if err != nil {
   return key, err
  }
  // 判断是否过期，证书没有过期直接返回
  if location.Unix()-prepareTime > nowTime {
   decryptBytes, err := decryptGCM(aesKey, encryptCertificate.EncryptCertificate.Nonce, encryptCertificate.EncryptCertificate.Ciphertext,
    encryptCertificate.EncryptCertificate.AssociatedData)
   if err != nil {
    return key, err
   }
   key = string(decryptBytes)
   publicSyncMap.Store(cacheValueKey, key)
   publicSyncMap.Store(cacheExpireTimeKey, encryptCertificate.ExpireTime)
   return key, nil
  }
 }
 return key, errors.New("get public key error")
}

 

二、发起微信支付

 

jsapi 发起支付

调用统一下单接口

统一下单接口文档 https://pay.weixin.qq.com/wik...

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// 统一下单接口
func commonPay() (payResMap map[string]string, err error) {
 payResMap = make(map[string]string)
 amount := 10
 paramMap := make(map[string]interface{})
 paramMap["appid"] = appId
 paramMap["mchid"] = mchId
 paramMap["description"] = fmt.Sprintf("微信充值:￥%d", amount)
 paramMap["out_trade_no"] = fmt.Sprintf("test%s%s", time.Now().Format("20060102150405"), randNumber())
 paramMap["notify_url"] = "http://tools.localhost/notify"
 paramMap["amount"] = map[string]interface{}{"total": amount * 100, "currency": "CNY"}
 paramMap["payer"] = map[string]string{"openid": "opCO05utXkPQh3Vje13WjEdQpAZ4"}
 token, err := authorization(http.MethodPost, paramMap, commonPayUrl)
 if err != nil {
  return payResMap, err
 }
 marshal, _ := json.Marshal(paramMap)
 request, err := http.NewRequest(http.MethodPost, commonPayUrl, bytes.NewReader(marshal))
 if err != nil {
  return payResMap, err
 }
 request.Header.Add("Authorization", "WECHATPAY2-SHA256-RSA2048 "+token)
 request.Header.Add("User-Agent", "用户代理(https://zh.wikipedia.org/wiki/User_agent)")
 request.Header.Add("Content-type", "application/json;charset='utf-8'")
 request.Header.Add("Accept", "application/json")
 client := http.DefaultClient
 response, err := client.Do(request)
 if err != nil {
  return payResMap, err
 }
 defer func() {
  response.Body.Close()
 }()
 bodyBytes, err := ioutil.ReadAll(response.Body)
 if err != nil {
  return payResMap, err
 }
 if err = json.Unmarshal(bodyBytes, &payResMap); err != nil {
  return payResMap, err
 }
 if payResMap["prepay_id"] == "" {
  return payResMap, errors.New("code:" + payResMap["code"] + "err:" + payResMap["message"])
 }
 return payResMap, nil
}

生成jsapi发起支付

JSAPI 调起支付接口文档 https://pay.weixin.qq.com/wik...

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func jsApi(payResMap map[string]string) (payJson string, err error) {
 payMap := make(map[string]string)
 timeStamp := time.Now().Unix()
 nonce := getRandomString(32)
 packageStr := "prepay_id=" + payResMap["prepay_id"]
 payMap["appId"] = appId
 payMap["timeStamp"] = fmt.Sprintf("%v", timeStamp)
 payMap["nonceStr"] = nonce
 payMap["package"] = packageStr
 // 签名
 message := fmt.Sprintf("%s\n%s\n%s\n%s\n", appId, fmt.Sprintf("%v", timeStamp), nonce, packageStr)
 open, err := os.Open("/Users/apple/data/www/go/work/src/study/testwechantpay/private.pem")
 if err != nil {
  return payJson, err
 }
 defer open.Close()
 privateKey, err := ioutil.ReadAll(open)
 if err != nil {
  return payJson, err
 }
 signBytes, err := signPKCS1v15(hasha256(message), privateKey, crypto.SHA256)
 if err != nil {
  return payJson, err
 }
 sign := base64EncodeStr(signBytes)
 payMap["signType"] = sign
 payMap["paySign"] = "RSA"
 payJsonBytes, err := json.Marshal(payMap)
 if err != nil {
  return payJson, err
 }
 payJson = string(payJsonBytes)
 return payJson, nil
}

前台发起支付js

需要加载微信js http://res.wx.qq.com/open/js/jweixin-1.6.0.js

调用微信js需要在微信支付平台，设置支付目录

指引文档 https://pay.weixin.qq.com/wik...

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<script type="text/javascript" src="__STATIC__/frontend/js/jquery.min.js"></script>
<script type="text/javascript" src="http://res.wx.qq.com/open/js/jweixin-1.6.0.js"></script>
<script>
 $(function () {
  $(".am-btn").click(function () {
   var score = $(".score div input:checked").val();
   $.post("发起微信支付后端接口URL", {"score": score}, function (res) {
    if (res.status === 500) {
     alert(res.message);
     return;
    }
    if (typeof WeixinJSBridge == "undefined") {
     if (document.addEventListener) {
      document.addEventListener('WeixinJSBridgeReady', onBridgeReady, false);
     } else if (document.attachEvent) {
      document.attachEvent('WeixinJSBridgeReady', onBridgeReady);
      document.attachEvent('onWeixinJSBridgeReady', onBridgeReady);
     }
    } else {
     onBridgeReady(res);
    }
   })
  })
  function onBridgeReady(param) {
   var orderId = param.data.orderId;
   WeixinJSBridge.invoke('getBrandWCPayRequest', {
     "appId": param.data.appId,
     "timeStamp": param.data.timeStamp,
     "nonceStr": param.data.nonceStr,
     "package": param.data.package,
     "signType": param.data.signType,
     "paySign": param.data.paySign
    },
    function (res) {
     if (res.err_msg === "get_brand_wcpay_request:ok") {
      window.location.href = "{:url('index/order/successful')}?order_id=" + orderId;
     }
    });
  }
 })
 </script>

 

三、异步通知

 

签名校验

文档 https://pay.weixin.qq.com/wik...

验证签名

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//验证数字签名
func VerifyRsaSign(msg []byte, sign []byte, publicStr []byte, hashType crypto.Hash) bool {
 //pem解码
 block, _ := pem.Decode(publicStr)
 //x509解码
 publicKeyInterface, err := x509.ParseCertificate(block.Bytes)
 if err != nil {
  panic(err)
 }
 publicKey := publicKeyInterface.PublicKey.(*rsa.PublicKey)
 //验证数字签名
 err = rsa.VerifyPKCS1v15(publicKey, hashType, msg, sign) //crypto.SHA1
 return err == nil
}
// 验证签名
func notifyValidate(timeStamp ,nonce,rawPost,signature string) (bool, error) {
 signature = base64DecodeStr(signature)
 message := fmt.Sprintf("%s\n%s\n%s\n", timeStamp, nonce, rawPost)
 publicKey, err := getPublicKey()
 if err != nil {
  return false, err
 }
 return VerifyRsaSign(hasha256(message), []byte(signature), []byte(publicKey), crypto.SHA256), nil
}

报文解密

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type NotifyResponse struct {
 CreateTime string   `json:"create_time"`
 Resource NotifyResource `json:"resource"`
}
type NotifyResource struct {
 Ciphertext  string `json:"ciphertext"`
 AssociatedData string `json:"associated_data"`
 Nonce   string `json:"nonce"`
}
func notifyDecrypt(rawPost string) (decrypt string, err error) {
 var notifyResponse NotifyResponse
 if err = json.Unmarshal([]byte(rawPost), &notifyResponse); err != nil {
  return decrypt, err
 }
 decryptBytes, err := decryptGCM(aesKey, notifyResponse.Resource.Nonce, notifyResponse.Resource.Ciphertext,
  notifyResponse.Resource.AssociatedData)
 if err != nil {
  return decrypt, err
 }
 decrypt = string(decryptBytes)
 return decrypt, nil
}

 

四、查询订单

 

文档 https://pay.weixin.qq.com/wik...

查询订单

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const searchTradeUrl = "https://api.mch.weixin.qq.com/v3/pay/transactions/out-trade-no/%s?mchid=%s"
// 查询交易
func searchTrade(orderId string) (trade string, err error) {
 rawUrl := fmt.Sprintf(searchTradeUrl, orderId, mchId)
 token, err := authorization(http.MethodGet, nil, rawUrl)
 if err != nil {
  return trade, err
 }
 request, err := http.NewRequest(http.MethodGet, rawUrl, nil)
 if err != nil {
  return trade, err
 }
 request.Header.Add("Authorization", "WECHATPAY2-SHA256-RSA2048 "+token)
 request.Header.Add("User-Agent", "用户代理(https://zh.wikipedia.org/wiki/User_agent)")
 request.Header.Add("Content-type", "application/json;charset='utf-8'")
 request.Header.Add("Accept", "application/json")
 client := http.DefaultClient
 response, err := client.Do(request)
 if err != nil {
  return trade, err
 }
 defer response.Body.Close()
 bodyBytes, err := ioutil.ReadAll(response.Body)
 if err != nil {
  return trade, err
 }
 return string(bodyBytes), nil
}

 

五、申请退款

 

文档 https://pay.weixin.qq.com/wik...

申请退款

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const refundUrl = "https://api.mch.weixin.qq.com/v3/refund/domestic/refunds"
func refundTrade(orderId string, amount float64) (trade string, err error) {
 paramMap := make(map[string]interface{})
 paramMap["out_trade_no"] = orderId
 paramMap["out_refund_no"] = orderId + "-1"
 paramMap["amount"] = map[string]interface{}{"refund": amount * 100, "total": amount * 100, "currency": "CNY"}
 token, err := authorization(http.MethodPost, paramMap, refundUrl)
 if err != nil {
  return trade, err
 }
 marshal, _ := json.Marshal(paramMap)
 request, err := http.NewRequest(http.MethodPost, refundUrl, bytes.NewReader(marshal))
 if err != nil {
  return trade, err
 }
 request.Header.Add("Authorization", "WECHATPAY2-SHA256-RSA2048 "+token)
 request.Header.Add("User-Agent", "用户代理(https://zh.wikipedia.org/wiki/User_agent)")
 request.Header.Add("Content-type", "application/json;charset='utf-8'")
 request.Header.Add("Accept", "application/json")
 client := http.DefaultClient
 response, err := client.Do(request)
 if err != nil {
  return trade, err
 }
 defer func() {
  response.Body.Close()
 }()
 bodyBytes, err := ioutil.ReadAll(response.Body)
 if err != nil {
  return trade, err
 }
 return string(bodyBytes), nil
}

到此这篇关于golang实现微信支付v3版本的方法的文章就介绍到这了,更多相关golang实现微信支付内容请搜索服务器之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持服务器之家！

原文链接：https://studygolang.com/articles/33612

标签：
golang 微信支付 

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