util/wechat/pay.go

package wechat

import (
	"bytes"
	"encoding/xml"
	"errors"
	"fmt"

	"git.chuangxin1.com/cx/util"
)

const (
	// WePayHost base host
	WePayHost = `https://api.mch.weixin.qq.com`

	// WePayURLUnifiedOrder pay 付款
	WePayURLUnifiedOrder = `/pay/unifiedorder`
	// WePayURLUnifiedQuery order query 订单查询
	WePayURLUnifiedQuery = `/pay/orderquery`
	// WePayURLPayRefund pay refund 退款
	WePayURLPayRefund = `/secapi/pay/refund`
	// WePayURLPapPay 委托代扣申请扣款
	WePayURLPapPay = `/pay/pappayapply`

	// WePayTradeTypeJS JSAPI 公众号支付
	WePayTradeTypeJS = `JSAPI`
	// WePayTradeTypeNative NATIVE 扫码支付
	WePayTradeTypeNative = `NATIVE`
	// WePayTradeTypeAPP APP APP支付
	WePayTradeTypeAPP = `APP`

	// WeOrderPaySuccess pay ok
	WeOrderPaySuccess = 0
)

// WePayConfig WeChat pay configure
type WePayConfig struct {
	AppID      string `json:"appid"`
	MchID      string `json:"mchid"`
	Key        string `json:"key"`
	AppSecret  string `json:"appsecret"`
	SSLCert    string `json:"sslcert"`
	SSLKey     string `json:"sslkey"`
	ContractID string `json:"contractid"`
	NotifyURL  string `json:"notify_url"`
}

// UnifiedOrder https://api.mch.weixin.qq.com/pay/unifiedorder
type UnifiedOrder struct {
	XMLName        xml.Name `xml:"xml"`
	AppID          string   `xml:"appid"`
	MchID          string   `xml:"mch_id"`
	Body           string   `xml:"body"`
	NonceStr       string   `xml:"nonce_str"`
	NotifyURL      string   `xml:"notify_url"`
	TradeType      string   `xml:"trade_type"`
	OpenID         string   `xml:"openid"`
	SpbillCreateIP string   `xml:"spbill_create_ip"`
	TimeStart      string   `xml:"time_start"`
	TotalFee       int      `xml:"total_fee"`
	OutTradeNo     string   `xml:"out_trade_no"`
	Attach         string   `xml:"attach"`
	Sign           string   `xml:"sign"`
}

// OrderQuery https://api.mch.weixin.qq.com/pay/orderquery
type OrderQuery struct {
	XMLName       xml.Name `xml:"xml"`
	AppID         string   `xml:"appid"`
	MchID         string   `xml:"mch_id"`
	NonceStr      string   `xml:"nonce_str"`
	TransactionID string   `xml:"transaction_id,omitempty"`
	OutTradeNo    string   `xml:"out_trade_no,omitempty"`
	Sign          string   `xml:"sign"`
}

/*
<xml><appid><![CDATA[wx0e9caf2ab1fcd508]]></appid>
<attach><![CDATA[邦泰商旅]]></attach>
<bank_type><![CDATA[CITIC_CREDIT]]></bank_type>
<cash_fee><![CDATA[349000]]></cash_fee>
<fee_type><![CDATA[CNY]]></fee_type>
<is_subscribe><![CDATA[N]]></is_subscribe>
<mch_id><![CDATA[1340131101]]></mch_id>
<nonce_str><![CDATA[0gwbd25n61bxkw6m64kj4ovf60i2q2sg]]></nonce_str>
<openid><![CDATA[o7-PevpkcTqeJOkOF4X7VFhX_SwY]]></openid>
<out_trade_no><![CDATA[134013110120180709134447]]></out_trade_no>
<result_code><![CDATA[SUCCESS]]></result_code>
<return_code><![CDATA[SUCCESS]]></return_code>
<sign><![CDATA[8E581E734384DB2EA6FC08B1482BCCFC]]></sign>
<time_end><![CDATA[20180709134502]]></time_end>
<total_fee>349000</total_fee>
<trade_type><![CDATA[JSAPI]]></trade_type>
<transaction_id><![CDATA[4200000120201807096318807841]]></transaction_id>
</xml>

<xml>
	<return_code>SUCCESS</return_code>
	<return_msg></return_msg>
	<appid>wx84998d72abc5970a</appid>
	<mch_id>1511843111</mch_id>
	<nonce_str>1534475690</nonce_str>
	<sign>27577C258DD809DCE0F8A515233494D1</sign>
	<result_code>SUCCESS</result_code>
	<prepay_id></prepay_id>
	<trade_type>JSAPI</trade_type>
	<code_url></code_url>
	<err_code></err_code>
	<err_code_des></err_code_des>
	<openid>opCl81S2TyHPx7IJRZxc2yGrom5E</openid>
	<attach>{&#34;PlaceNo&#34;:&#34;603009&#34;,&#34;VNO&#34;:&#34;&#34;,&#34;Start&#34;:&#34;2018-08-17 11:14:50&#34;</attach>
	<is_subscribe>Y</is_subscribe>
	<bank_type>CFT</bank_type>
	<cash_fee>2</cash_fee>
	<fee_type>CNY</fee_type>
	<out_trade_no>1534475690957535612</out_trade_no>
	<time_end>20180817111506</time_end>
	<total_fee>2</total_fee>
	<trade_state></trade_state>
	<trade_state_desc></trade_state_desc>
	<transaction_id>4200000159201808174345835044</transaction_id>
</xml>
// */

// FormWePayNotify notify
type FormWePayNotify struct {
	XMLName  xml.Name `xml:"xml" json:"_,omitempty"`
	AppID    string   `form:"appid" xml:"appid"`
	Attach   string   `form:"attach" xml:"attach"`
	BankType string   `form:"bank_type" xml:"bank_type"`
	CashFee  int      `form:"cash_fee" xml:"cash_fee"`
	FeeType  string   `form:"fee_type" xml:"fee_type"`

	MchID       string `form:"mch_id" xml:"mch_id"`
	IsSubscribe string `form:"is_subscribe" xml:"is_subscribe"`
	NonceStr    string `form:"nonce_str" xml:"nonce_str"`
	OpenID      string `form:"openid" xml:"openid"`
	OutTradeNo  string `form:"out_trade_no" xml:"out_trade_no"`

	ResultCode string `form:"result_code" xml:"result_code"`
	ReturnMsg  string `form:"return_msg" xml:"return_msg"`
	ReturnCode string `form:"return_code" xml:"return_code"`
	ErrCodeDes string `form:"err_code_des" xml:"err_code_des"`
	ErrCode    string `form:"err_code" xml:"err_code"`

	Sign     string `form:"sign" xml:"sign"`
	TimeEnd  string `form:"time_end" xml:"time_end"`
	TotalFee int    `form:"total_fee" xml:"total_fee"`

	TradeType     string `form:"trade_type" xml:"trade_type"`
	TransactionID string `form:"transaction_id" xml:"transaction_id"`
	ContractID    string `form:"contract_id" xml:"contract_id"`
}

// WePayReply pay reply
type WePayReply struct {
	XMLName        xml.Name `xml:"xml" json:"_,omitempty"`
	ReturnCode     string   `xml:"return_code"`
	ReturnMsg      string   `xml:"return_msg"`
	AppID          string   `xml:"appid"`
	MchID          string   `xml:"mch_id"`
	NonceStr       string   `xml:"nonce_str"`
	Sign           string   `xml:"sign"`
	ResultCode     string   `xml:"result_code"`
	PrePayID       string   `xml:"prepay_id"`
	TradeType      string   `xml:"trade_type"`
	URL            string   `xml:"code_url"`
	ErrCode        string   `xml:"err_code"`
	ErrCodeDes     string   `xml:"err_code_des"`
	OpenID         string   `xml:"openid"`
	Attach         string   `xml:"attach"`
	IsSubscribe    string   `xml:"is_subscribe"`
	BankType       string   `xml:"bank_type"`
	CashFee        string   `xml:"cash_fee"`
	FeeType        string   `xml:"fee_type"`
	OutTradeNo     string   `xml:"out_trade_no"`
	TimeEnd        string   `xml:"time_end"`
	TotalFee       string   `xml:"total_fee"`
	TradeState     string   `xml:"trade_state"`
	TradeStateDesc string   `xml:"trade_state_desc"`
	TransactionID  string   `xml:"transaction_id"`
	ContractID     string   `form:"contract_id" xml:"contract_id"`
}

var (
	// WePayTradeState 交易状态
	WePayTradeState = map[string]int{"SUCCESS": 0, "REFUND": 2, "NOTPAY": 3, "CLOSED": 4, "REVOKED": 5, "USERPAYING": 6, "PAYERROR": 7}
)

// PayCheck check reply
func PayCheck(reply WePayReply) (ok bool, err error) {
	//  通信是否正确
	if reply.ReturnCode == "FAIL" {
		err = errors.New(reply.ReturnMsg)
		return
	}
	// 交易是否成功
	if reply.ResultCode == "FAIL" {
		err = errors.New(reply.ErrCodeDes)
		return
	}

	ok = true
	return
}

// PayNotifyCheck check reply
func PayNotifyCheck(reply FormWePayNotify) (ok bool, err error) {
	//  通信是否正确
	if reply.ReturnCode == "FAIL" {
		err = errors.New(reply.ReturnMsg)
		return
	}
	// 交易是否成功
	if reply.ResultCode == "FAIL" {
		err = errors.New(reply.ErrCodeDes)
		return
	}

	ok = true
	return
}

// PayQuery order query
func PayQuery(cpyid int, config WePayConfig, order OrderQuery) (reply WePayReply, err error) {
	m := make(map[string]interface{})

	m["appid"] = order.AppID
	m["mch_id"] = order.MchID
	m["out_trade_no"] = order.OutTradeNo
	m["nonce_str"] = order.NonceStr
	//m["transaction_id"] = order.TransactionID

	var (
		data []byte
	)

	order.Sign = Sign(m, config.Key)
	data, err = xml.Marshal(order)
	if err != nil {
		return
	}

	reply, err = post(WePayHost+WePayURLUnifiedQuery, data)
	return
}

// Pay pay
func Pay(config WePayConfig, order UnifiedOrder) (reply WePayReply, err error) {
	m := make(map[string]interface{})

	m["appid"] = order.AppID
	m["mch_id"] = order.MchID
	m["body"] = order.Body
	m["notify_url"] = order.NotifyURL
	m["trade_type"] = order.TradeType
	m["spbill_create_ip"] = order.SpbillCreateIP
	m["total_fee"] = order.TotalFee
	m["out_trade_no"] = order.OutTradeNo
	m["nonce_str"] = order.NonceStr
	m["attach"] = order.Attach
	m["time_start"] = order.TimeStart
	m["openid"] = order.OpenID

	var data []byte

	order.Sign = Sign(m, config.Key)
	if data, err = xml.Marshal(order); err != nil {
		return
	}

	reply, err = post(WePayHost+WePayURLUnifiedOrder, data)
	return
}

func post(url string, data []byte) (reply WePayReply, err error) {
	var (
		msg     util.Message
		headers = make(map[string]string)
	)

	headers["Accept"] = "application/xml"
	headers["Content-Type"] = "application/xml; charset=utf-8"
	msg, err = util.Post(url, "", "", headers, bytes.NewReader(data))
	if err != nil {
		return
	}

	fmt.Println("************Response************")
	fmt.Println(string(msg.Body))
	fmt.Println("************ResponseEnd************")
	err = xml.Unmarshal(msg.Body, &reply)

	return
}