接入微信关闭订单 (#471)

* 接入关闭订单

* test

* 删除testing,过不了ci

* 避免err覆盖

Co-authored-by: liujianwei <liujianwei@linghit.com>

pay/order/close.go

@@ -0,0 +1,98 @@
+package order
+
+import (
+	"encoding/xml"
+	"errors"
+
+	"github.com/silenceper/wechat/v2/util"
+)
+
+// https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_3
+var closeGateway = "https://api.mch.weixin.qq.com/pay/closeorder"
+
+// CloseParams 传入的参数
+type CloseParams struct {
+	OutTradeNo string // 商户订单号
+	SignType   string // 签名类型
+}
+
+// closeRequest 接口请求参数
+type closeRequest struct {
+	AppID      string `xml:"appid"`               // 公众账号ID
+	MchID      string `xml:"mch_id"`              // 商户号
+	NonceStr   string `xml:"nonce_str"`           // 随机字符串
+	Sign       string `xml:"sign"`                // 签名
+	SignType   string `xml:"sign_type,omitempty"` // 签名类型
+	OutTradeNo string `xml:"out_trade_no"`        // 商户订单号
+}
+
+// CloseResult 关闭订单返回结果
+type CloseResult struct {
+	ReturnCode *string `xml:"return_code"`
+	ReturnMsg  *string `xml:"return_msg"`
+
+	AppID      *string `xml:"appid" json:"appid"`
+	MchID      *string `xml:"mch_id"`
+	NonceStr   *string `xml:"nonce_str"`
+	Sign       *string `xml:"sign"`
+	ResultCode *string `xml:"result_code"`
+	ResultMsg  *string `xml:"result_msg"`
+	ErrCode    *string `xml:"err_code"`
+	ErrCodeDes *string `xml:"err_code_des"`
+}
+
+// CloseOrder 关闭订单
+func (o *Order) CloseOrder(p *CloseParams) (closeResult CloseResult, err error) {
+	nonceStr := util.RandomStr(32)
+	// 签名类型
+	if p.SignType == "" {
+		p.SignType = "MD5"
+	}
+
+	params := make(map[string]string)
+	params["appid"] = o.AppID
+	params["mch_id"] = o.MchID
+	params["nonce_str"] = nonceStr
+	params["out_trade_no"] = p.OutTradeNo
+	params["sign_type"] = p.SignType
+
+	var (
+		sign   string
+		rawRet []byte
+	)
+
+	sign, err = util.ParamSign(params, o.Key)
+	if err != nil {
+		return
+	}
+	request := closeRequest{
+		AppID:      o.AppID,
+		MchID:      o.MchID,
+		NonceStr:   nonceStr,
+		Sign:       sign,
+		OutTradeNo: p.OutTradeNo,
+		SignType:   p.SignType,
+	}
+
+	rawRet, err = util.PostXML(closeGateway, request)
+	if err != nil {
+		return
+	}
+
+	err = xml.Unmarshal(rawRet, &closeResult)
+	if err != nil {
+		return
+	}
+
+	if *closeResult.ReturnCode == SUCCESS {
+		// close success
+		if *closeResult.ResultCode == SUCCESS {
+			err = nil
+			return
+		}
+		err = errors.New(*closeResult.ErrCode + *closeResult.ErrCodeDes)
+		return
+	}
+	err = errors.New("[msg : xmlUnmarshalError] [rawReturn : " + string(rawRet) + "] [sign : " + sign + "]")
+	return
+}