目錄
- 一、準備階段
- 二、發起微信支付
- 三、異步通知
- 四、查詢訂單
- 五、申請退款
一、準備階段
獲取私鑰
官方文檔 https://kf.qq.com/faq/161222N...
獲取私鑰證書的序列號 https://pay.weixin.qq.com/wik...
openssl x509 -in 1900009191_20180326_cert.pem -noout -serial
serial=1DDE55AD98ED71D6EDD4A4A16996DE7B47773A8C
私鑰獲取后有三個文件
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內容
獲取公鑰(平臺證書)
官方文檔
更新證書 https://pay.weixin.qq.com/wik...
平臺證書會提前10天生成新證書，微信官方推薦在舊證書過期前5-10天部署新證書
獲取證書API文檔 https://pay.weixin.qq.com/wik...
身份證認證信息生成文檔 https://pay.weixin.qq.com/wik...
常量
const appId = "" // 小程序或者公眾號的appid
const mchId = "" // 微信支付的商戶id
const privateSerialNo = "" // 私鑰證書號
const aesKey = "" // 微信支付aes key
生成數字簽名
// 對消息的散列值進行數字簽名
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編碼
func base64EncodeStr(src []byte) string {
return base64.StdEncoding.EncodeToString(src)
}
生成身份認證信息
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
}
報文解密
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
}
獲取平臺證書
// 獲取公鑰
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
// 獲取公鑰
func getPublicKey() (key string, err error) {
var prepareTime int64 = 24 * 3600 * 3 // 證書提前三天過期舊證書，獲取新證書
nowTime := time.Now().Unix()
// 讀取公鑰緩存數據
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 {
// 格式化時間
local, _ := time.LoadLocation("Local")
location, _ := time.ParseInLocation(time.RFC3339, cacheExpireTime.(string), local)
// 判斷是否過期，證書沒有過期直接返回
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", "用戶代理(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 {
// 格式化時間
local, _ := time.LoadLocation("Local")
location, err := time.ParseInLocation(time.RFC3339, encryptCertificate.ExpireTime, local)
if err != nil {
return key, err
}
// 判斷是否過期，證書沒有過期直接返回
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、發起微信支付
jsapi 發起支付
調用統一下單接口
統一下單接口文檔 https://pay.weixin.qq.com/wik...
// 統一下單接口
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", "用戶代理(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發起支付
JSAPI 調起支付接口文檔 https://pay.weixin.qq.com/wik...
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
// 簽名
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
}
前臺發起支付js
需要加載微信js http://res.wx.qq.com/open/js/jweixin-1.6.0.js
調用微信js需要在微信支付平臺，設置支付目錄
指引文檔 https://pay.weixin.qq.com/wik...
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("發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、異步通知
簽名校驗
文檔 https://pay.weixin.qq.com/wik...
驗證簽名
//驗證數字簽名
func VerifyRsaSign(msg []byte, sign []byte, publicStr []byte, hashType crypto.Hash) bool {
//pem解碼
block, _ := pem.Decode(publicStr)
//x509解碼
publicKeyInterface, err := x509.ParseCertificate(block.Bytes)
if err != nil {
panic(err)
}
publicKey := publicKeyInterface.PublicKey.(*rsa.PublicKey)
//驗證數字簽名
err = rsa.VerifyPKCS1v15(publicKey, hashType, msg, sign) //crypto.SHA1
return err == nil
}
// 驗證簽名
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
}
報文解密
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、查詢訂單
文檔 https://pay.weixin.qq.com/wik...
查詢訂單
const searchTradeUrl = "https://api.mch.weixin.qq.com/v3/pay/transactions/out-trade-no/%s?mchid=%s"
// 查詢交易
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", "用戶代理(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、申請退款
文檔 https://pay.weixin.qq.com/wik...
申請退款
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", "用戶代理(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
}
到此這篇關于golang實現微信支付v3版本的方法的文章就介紹到這了,更多相關golang實現微信支付內容請搜索腳本之家以前的文章或繼續瀏覽下面的相關文章希望大家以后多多支持腳本之家！
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