feat: 添加发放红包接口 (#726)

* feat: 添加发放红包接口

* feat: 添加发放红包接口

* chore: golang ci lint

---------

Co-authored-by: ross <ross@ross.ross>

pay/pay.go

@@ -4,6 +4,7 @@ import (
 	"github.com/silenceper/wechat/v2/pay/config"
 	"github.com/silenceper/wechat/v2/pay/notify"
 	"github.com/silenceper/wechat/v2/pay/order"
+	"github.com/silenceper/wechat/v2/pay/redpacket"
 	"github.com/silenceper/wechat/v2/pay/refund"
 	"github.com/silenceper/wechat/v2/pay/transfer"
 )
@@ -37,3 +38,8 @@ func (pay *Pay) GetRefund() *refund.Refund {
 func (pay *Pay) GetTransfer() *transfer.Transfer {
 	return transfer.NewTransfer(pay.cfg)
 }
+
+// GetRedpacket 红包
+func (pay *Pay) GetRedpacket() *redpacket.Redpacket {
+	return redpacket.NewRedpacket(pay.cfg)
+}

pay/redpacket/redpacket.go

@@ -0,0 +1,131 @@
+package redpacket
+
+import (
+	"encoding/xml"
+	"fmt"
+	"strconv"
+
+	"github.com/silenceper/wechat/v2/pay/config"
+	"github.com/silenceper/wechat/v2/util"
+)
+
+// redpacketGateway 发放红包接口
+// https://pay.weixin.qq.com/wiki/doc/api/tools/cash_coupon.php?chapter=13_4&index=3
+var redpacketGateway = "https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack"
+
+// Redpacket struct extends context
+type Redpacket struct {
+	*config.Config
+}
+
+// NewRedpacket return an instance of Redpacket package
+func NewRedpacket(cfg *config.Config) *Redpacket {
+	return &Redpacket{cfg}
+}
+
+// Params 调用参数
+type Params struct {
+	MchBillno   string // 商户订单号
+	SendName    string // 商户名称
+	ReOpenID    string
+	TotalAmount int
+	TotalNum    int
+	Wishing     string
+	ClientIP    string
+	ActName     string
+	Remark      string
+
+	RootCa string // ca证书
+}
+
+// request 接口请求参数
+type request struct {
+	NonceStr    string `xml:"nonce_str"`
+	Sign        string `xml:"sign"`
+	MchID       string `xml:"mch_id"`
+	MchBillno   string `xml:"mch_billno"`
+	Wxappid     string `xml:"wxappid"`
+	SendName    string `xml:"send_name"`
+	ReOpenID    string `xml:"re_openid"`
+	TotalAmount int    `xml:"total_amount"`
+	TotalNum    int    `xml:"total_num"`
+	Wishing     string `xml:"wishing"`
+	ClientIP    string `xml:"client_ip"`
+	ActName     string `xml:"act_name"`
+	Remark      string `xml:"remark"`
+}
+
+// Response 接口返回
+type Response struct {
+	ReturnCode  string `xml:"return_code"`
+	ReturnMsg   string `xml:"return_msg"`
+	ResultCode  string `xml:"result_code,omitempty"`
+	ErrCode     string `xml:"err_code,omitempty"`
+	ErrCodeDes  string `xml:"err_code_des,omitempty"`
+	MchBillno   string `xml:"mch_billno,omitempty"`
+	MchID       string `xml:"mch_id,omitempty"`
+	Wxappid     string `xml:"wxappid"`
+	ReOpenID    string `xml:"re_openid"`
+	TotalAmount int    `xml:"total_amount"`
+	SendListid  string `xml:"send_listid"`
+}
+
+// SendRedpacket 发放红包
+func (redpacket *Redpacket) SendRedpacket(p *Params) (rsp *Response, err error) {
+	nonceStr := util.RandomStr(32)
+	param := make(map[string]string)
+
+	param["nonce_str"] = nonceStr
+	param["mch_id"] = redpacket.MchID
+	param["wxappid"] = redpacket.AppID
+	param["mch_billno"] = p.MchBillno
+	param["send_name"] = p.SendName
+	param["re_openid"] = p.ReOpenID
+	param["total_amount"] = strconv.Itoa(p.TotalAmount)
+	param["total_num"] = strconv.Itoa(p.TotalNum)
+	param["wishing"] = p.Wishing
+	param["client_ip"] = p.ClientIP
+	param["act_name"] = p.ActName
+	param["remark"] = p.Remark
+	//param["scene_id"] = "PRODUCT_2"
+
+	sign, err := util.ParamSign(param, redpacket.Key)
+	if err != nil {
+		return
+	}
+
+	req := request{
+		NonceStr:    nonceStr,
+		Sign:        sign,
+		MchID:       redpacket.MchID,
+		Wxappid:     redpacket.AppID,
+		MchBillno:   p.MchBillno,
+		SendName:    p.SendName,
+		ReOpenID:    p.ReOpenID,
+		TotalAmount: p.TotalAmount,
+		TotalNum:    p.TotalNum,
+		Wishing:     p.Wishing,
+		ClientIP:    p.ClientIP,
+		ActName:     p.ActName,
+		Remark:      p.Remark,
+	}
+
+	rawRet, err := util.PostXMLWithTLS(redpacketGateway, req, p.RootCa, redpacket.MchID)
+	if err != nil {
+		return
+	}
+	err = xml.Unmarshal(rawRet, &rsp)
+	if err != nil {
+		return
+	}
+	if rsp.ReturnCode == "SUCCESS" {
+		if rsp.ResultCode == "SUCCESS" {
+			err = nil
+			return
+		}
+		err = fmt.Errorf("send redpacket error, errcode=%s,errmsg=%s", rsp.ErrCode, rsp.ErrCodeDes)
+		return
+	}
+	err = fmt.Errorf("[msg : xmlUnmarshalError] [rawReturn : %s] [sign : %s]", string(rawRet), sign)
+	return
+}