Merge pull request #3 from mailbaoer/master

add waxNotify support

README.md

@@ -8,6 +8,8 @@
 ## 快速开始
 以下是APP和小程序支付简单例子
 ```go
+import "github.com/aimuz/wechat-sdk/pay"
+
 wePay := &WePay{
 	AppId:     "xxx",
 	MchId:     "xxx",
@@ -25,6 +27,25 @@ results, outTradeNo, err := wePay.WaxPay(100, "open_id") // 金额，以分为
 ```
 
 ## 使用
+### 小程序支付通知
+```go
+waxNotify := pay.WaxPayNotifyReq{}
+ctx.ReadXML(&waxNotify)
+verifyParams := pay.WaxVerifyParams(waxNotify)
+valid := pay.WaxpayVerifySign(verifyParams, appKey, waxNotify.Sign) //appKey 为自己在微信支付后台设置的API密钥
+
+resp := new(pay.WaxPayNotifyResp)
+
+if valid {
+	业务处理逻辑···
+	resp.ReturnCode = "SUCCESS"
+	resp.ReturnMsg = "OK"
+} else {
+	错误处理逻辑···
+	resp.ReturnCode = "FAIL"
+	resp.ReturnMsg = "Verify Failed"
+}
+```
 
 
 #### APP支付

pay/check.go

@@ -1,6 +1,69 @@
 package pay
 
-//// 验证支付回调
-//func ()  {
-//
-//}
+import (
+	"github.com/aimuz/wechat-sdk/utils"
+	"strconv"
+)
+
+type (
+	WaxPayNotifyReq struct {
+		AppID       string  `xml:"appid"`
+		MchID       string  `xml:"mch_id"`
+		BankType    string  `xml:"bank_type"`
+		CashFee     float64 `xml:"cash_fee"`
+		FeeType     string  `xml:"fee_type"`
+		IsSubscribe string  `xml:"is_subscribe"`
+
+		NonceStr      string  `xml:"nonce_str"`
+		OpenID        string  `xml:"openid"`
+		OutTradeNo    string  `xml:"out_trade_no"`
+		ResultCode    string  `xml:"result_code"`
+		ReturnCode    string  `xml:"return_code"`
+		Sign          string  `xml:"sign"`
+		TimeEnd       string  `xml:"time_end"`
+		TotalFee      float64 `xml:"total_fee"`
+		TradeType     string  `xml:"trade_type"`
+		TransactionID string  `xml:"transaction_id"`
+	}
+
+	WaxPayNotifyResp struct {
+		ReturnCode string `xml:"return_code"`
+		ReturnMsg  string `xml:"return_msg"`
+	}
+)
+
+/**
+ * 微信通知验证
+ */
+
+// 微信小程序待验证参数
+func WaxVerifyParams(req WaxPayNotifyReq) map[string]string {
+	verifyParams := make(map[string]string)
+
+	verifyParams["appid"] = req.AppID
+	verifyParams["bank_type"] = req.BankType
+	verifyParams["cash_fee"] = strconv.FormatFloat(req.CashFee, 'f', 0, 64)
+	verifyParams["fee_type"] = req.FeeType
+	verifyParams["is_subscribe"] = req.IsSubscribe
+	verifyParams["mch_id"] = req.MchID
+	verifyParams["nonce_str"] = req.NonceStr
+	verifyParams["openid"] = req.OpenID
+	verifyParams["out_trade_no"] = req.OutTradeNo
+	verifyParams["result_code"] = req.ResultCode
+	verifyParams["return_code"] = req.ReturnCode
+	verifyParams["time_end"] = req.TimeEnd
+	verifyParams["total_fee"] = strconv.FormatFloat(req.TotalFee, 'f', 0, 64)
+	verifyParams["trade_type"] = req.TradeType
+	verifyParams["transaction_id"] = req.TransactionID
+
+	return verifyParams
+}
+
+// 微信小程序支付签名验证
+func WaxpayVerifySign(verifyParams map[string]string, signKey string, sign string) bool {
+	signCalc, _ := utils.GenWeChatPaySign(verifyParams, signKey)
+	if sign == signCalc {
+		return true
+	}
+	return false
+}

utils/utils.go

@@ -6,6 +6,7 @@ import (
 	"crypto/aes"
 	"crypto/cipher"
 	"crypto/md5"
+	"encoding/hex"
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
@@ -96,7 +97,9 @@ func GenWeChatPaySign(m map[string]string, payKey string) (string, error) {
 	if err != nil {
 		return "", err
 	}
-	return fmt.Sprintf("%x", signByte), nil
+
+	sign := strings.ToUpper(hex.EncodeToString(signByte))
+	return sign, nil
 }
 
 // GetTradeNO 生成订单号，不推荐直接使用