feat: 新增微信支付查询结果 (#380)

* feat: 增加微信支付查询结果

* feat: 增加微信支付查询结果

* fix: 修复golangci-lint失败

* fix: 修复golangci-lint失败

* refactor: 微信支付结果查询错误友好提示

pay/order/pay.go

@@ -11,9 +11,12 @@ import (
 	"github.com/silenceper/wechat/v2/util"
 )
 
-//https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_1
+// https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_1
 var payGateway = "https://api.mch.weixin.qq.com/pay/unifiedorder"
 
+// SUCCESS 表示支付成功
+const SUCCESS = "SUCCESS"
+
 // Order struct extends context
 type Order struct {
 	*config.Config
@@ -25,7 +28,7 @@ func NewOrder(cfg *config.Config) *Order {
 	return &order
 }
 
-// Params was NEEDED when request unifiedorder
+// Params was NEEDED when request Unified order
 // 传入的参数，用于生成 prepay_id 的必需参数
 type Params struct {
 	TotalFee   string
@@ -51,7 +54,7 @@ type Config struct {
 	PaySign   string `json:"paySign"`
 }
 
-// PreOrder 是 unifie order 接口的返回
+// PreOrder 是 Unified order 接口的返回
 type PreOrder struct {
 	ReturnCode string `xml:"return_code"`
 	ReturnMsg  string `xml:"return_msg"`
@@ -70,14 +73,14 @@ type PreOrder struct {
 
 // payRequest 接口请求参数
 type payRequest struct {
-	AppID          string `xml:"appid"`
-	MchID          string `xml:"mch_id"`
-	DeviceInfo     string `xml:"device_info,omitempty"`
-	NonceStr       string `xml:"nonce_str"`
-	Sign           string `xml:"sign"`
-	SignType       string `xml:"sign_type,omitempty"`
-	Body           string `xml:"body"`
-	Detail         string `xml:"detail,omitempty"`
+	AppID          string `xml:"appid"`                 // 公众账号ID
+	MchID          string `xml:"mch_id"`                // 商户号
+	DeviceInfo     string `xml:"device_info,omitempty"` // 设备号
+	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
+	Body           string `xml:"body"`                  // 商品描述
+	Detail         string `xml:"detail,omitempty"`      // 商品详情
 	Attach         string `xml:"attach,omitempty"`      // 附加数据
 	OutTradeNo     string `xml:"out_trade_no"`          // 商户订单号
 	FeeType        string `xml:"fee_type,omitempty"`    // 标价币种
@@ -89,7 +92,7 @@ type payRequest struct {
 	NotifyURL      string `xml:"notify_url"`            // 通知地址
 	TradeType      string `xml:"trade_type"`            // 交易类型
 	ProductID      string `xml:"product_id,omitempty"`  // 商品ID
-	LimitPay       string `xml:"limit_pay,omitempty"`   //
+	LimitPay       string `xml:"limit_pay,omitempty"`   // 指定支付方式
 	OpenID         string `xml:"openid,omitempty"`      // 用户标识
 	SceneInfo      string `xml:"scene_info,omitempty"`  // 场景信息
 
@@ -190,9 +193,9 @@ func (o *Order) PrePayOrder(p *Params) (payOrder PreOrder, err error) {
 	if err != nil {
 		return
 	}
-	if payOrder.ReturnCode == "SUCCESS" {
+	if payOrder.ReturnCode == SUCCESS {
 		// pay success
-		if payOrder.ResultCode == "SUCCESS" {
+		if payOrder.ResultCode == SUCCESS {
 			err = nil
 			return
 		}

pay/order/query.go

@@ -0,0 +1,82 @@
+package order
+
+import (
+	"encoding/xml"
+	"errors"
+
+	"github.com/silenceper/wechat/v2/pay/notify"
+	"github.com/silenceper/wechat/v2/util"
+)
+
+var queryGateway = "https://api.mch.weixin.qq.com/pay/orderquery"
+
+// QueryParams 传入的参数
+type QueryParams struct {
+	OutTradeNo    string // 商户订单号
+	SignType      string // 签名类型
+	TransactionID string // 微信订单号
+}
+
+// queryRequest 接口请求参数
+type queryRequest 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
+	TransactionID string `xml:"transaction_id"`      // 微信订单号
+	OutTradeNo    string `xml:"out_trade_no"`        // 商户订单号
+}
+
+// QueryOrder 查询订单
+func (o *Order) QueryOrder(p *QueryParams) (paidResult notify.PaidResult, 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
+	params["transaction_id"] = p.TransactionID
+
+	sign, err := util.ParamSign(params, o.Key)
+	if err != nil {
+		return
+	}
+	request := queryRequest{
+		AppID:         o.AppID,
+		MchID:         o.MchID,
+		NonceStr:      nonceStr,
+		Sign:          sign,
+		OutTradeNo:    p.OutTradeNo,
+		TransactionID: p.TransactionID,
+		SignType:      p.SignType,
+	}
+
+	rawRet, err := util.PostXML(queryGateway, request)
+	if err != nil {
+		return
+	}
+
+	err = xml.Unmarshal(rawRet, &paidResult)
+	if err != nil {
+		return
+	}
+
+	if *paidResult.ReturnCode == SUCCESS {
+		// query success
+		if *paidResult.ResultCode == SUCCESS {
+			err = nil
+			return
+		}
+		err = errors.New(*paidResult.ErrCode + *paidResult.ErrCodeDes)
+		return
+	}
+	err = errors.New("[msg : xmlUnmarshalError] [rawReturn : " + string(rawRet) + "] [sign : " + sign + "]")
+	return
+}