golang实现⽀付v3版本的⽅法⽬录
⼀、准备阶段
⼆、发起⽀付
三、异步通知
四、查询订单
五、申请退款
⼀、准备阶段
获取私钥
openssl x509 -in 1900009191_20180326_cert.pem -noout -serial
serial=1DDE55AD98ED71D6EDD4A4A16996DE7B47773A8C
私钥获取后有三个⽂件
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内容
获取公钥(平台证书)
官⽅⽂档
平台证书会提前10天⽣成新证书，官⽅推荐在旧证书过期前5-10天部署新证书
常量
const appId = ""  // ⼩程序或者的appid
const mchId = ""  // ⽀付的商户id
const privateSerialNo = "" // 私钥证书号
const aesKey = ""  // ⽀付aes key
⽣成数字签名
// 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
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
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
// 获取公钥
const publicKeyUrl = "h.weixin.qq/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(/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、发起⽀付
jsapi 发起⽀付
调⽤统⼀下单接⼝
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("充值:￥%d", amount)
paramMap["out_trade_no"] = fmt.Sprintf("test%s%s", time.Now().Format("20060102150405"), randNumber()) paramMap["notify_url"] = "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(/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
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)
return payJson, err
}
payJson = string(payJsonBytes)
return payJson, nil
}
前台发起⽀付js
调⽤js需要在⽀付平台，设置⽀付⽬录
<script type="text/javascript" src="__STATIC__/frontend/js/jquery.min.js"></script>
<script type="text/javascript" src="res.wx.qq/open/js/jweixin-1.6.0.js"></script> <script>
$(function () {
$(".am-btn").click(function () {
var score = $(".score div input:checked").val();
$.post("发起⽀付后端接⼝URL", {"score": score}, function (res) {
if (res.status === 500) {
ssage);
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 {
error parse new
onBridgeReady(res);
}
})
})
function onBridgeReady(param) {
var orderId = derId;
WeixinJSBridge.invoke('getBrandWCPayRequest', {
"appId": param.data.appId,
"timeStamp": param.data.timeStamp,
"nonceStr": Str,
"package": param.data.package,
"signType": param.data.signType,
"paySign": param.data.paySign
},
function (res) {
if (_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
验证签名
//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) {

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