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pay.go
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pay.go
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package order
import (
"encoding/xml"
"errors"
"strconv"
"strings"
"time"
"github.com/Kee1997/wechat/v2/pay/config"
"github.com/Kee1997/wechat/v2/util"
)
// 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
}
// NewOrder return an instance of order package
func NewOrder(cfg *config.Config) *Order {
order := Order{cfg}
return &order
}
// 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
CreateIP string
Body string
OutTradeNo string
TimeExpire string // 订单失效时间,格式为yyyyMMddHHmmss,如2009年12月27日9点10分10秒表示为20091227091010。
OpenID string
TradeType string
SignType string
Detail string
Attach string
GoodsTag string
NotifyURL string
}
// Config 是传出用于 js sdk 用的参数
type Config struct {
Timestamp string `json:"timestamp"`
NonceStr string `json:"nonceStr"`
PrePayID string `json:"prePayId"`
SignType string `json:"signType"`
Package string `json:"package"`
PaySign string `json:"paySign"`
}
// ConfigForApp 是传出用于 app sdk 用的参数
type ConfigForApp struct {
AppID string `json:"appid"`
MchID string `json:"partnerid"` // 微信支付分配的商户号
PrePayID string `json:"prepayid"`
Package string `json:"package"`
NonceStr string `json:"nonceStr"`
Timestamp string `json:"timestamp"`
Sign string `json:"sign"`
}
// PreOrder 是 Unified order 接口的返回
type PreOrder struct {
ReturnCode string `xml:"return_code"`
ReturnMsg string `xml:"return_msg"`
AppID string `xml:"appid,omitempty"`
MchID string `xml:"mch_id,omitempty"`
NonceStr string `xml:"nonce_str,omitempty"`
Sign string `xml:"sign,omitempty"`
ResultCode string `xml:"result_code,omitempty"`
TradeType string `xml:"trade_type,omitempty"`
PrePayID string `xml:"prepay_id,omitempty"`
CodeURL string `xml:"code_url,omitempty"`
MWebURL string `xml:"mweb_url,omitempty"`
ErrCode string `xml:"err_code,omitempty"`
ErrCodeDes string `xml:"err_code_des,omitempty"`
}
// payRequest 接口请求参数
type payRequest struct {
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
TotalFee string `xml:"total_fee"` // 标价金额
SpbillCreateIP string `xml:"spbill_create_ip"` // 终端IP
TimeStart string `xml:"time_start,omitempty"` // 交易起始时间
TimeExpire string `xml:"time_expire,omitempty"` // 交易结束时间
GoodsTag string `xml:"goods_tag,omitempty"` // 订单优惠标记
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"` // 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
XMLName struct{} `xml:"xml"`
}
func (req *payRequest) BridgePayRequest(p *Params, AppID, MchID, nonceStr, sign string) *payRequest {
request := payRequest{
AppID: AppID,
MchID: MchID,
NonceStr: nonceStr,
Sign: sign,
Body: p.Body,
OutTradeNo: p.OutTradeNo,
TotalFee: p.TotalFee,
SpbillCreateIP: p.CreateIP,
NotifyURL: p.NotifyURL,
TradeType: p.TradeType,
OpenID: p.OpenID,
SignType: p.SignType,
Detail: p.Detail,
Attach: p.Attach,
GoodsTag: p.GoodsTag,
}
return &request
}
// BridgeConfig get js bridge config
func (o *Order) BridgeConfig(p *Params) (cfg Config, err error) {
var (
buffer strings.Builder
timestamp = strconv.FormatInt(time.Now().Unix(), 10)
)
order, err := o.PrePayOrder(p)
if err != nil {
return
}
buffer.WriteString("appId=")
buffer.WriteString(order.AppID)
buffer.WriteString("&nonceStr=")
buffer.WriteString(order.NonceStr)
buffer.WriteString("&package=")
buffer.WriteString("prepay_id=" + order.PrePayID)
buffer.WriteString("&signType=")
buffer.WriteString(p.SignType)
buffer.WriteString("&timeStamp=")
buffer.WriteString(timestamp)
buffer.WriteString("&key=")
buffer.WriteString(o.Key)
sign, err := util.CalculateSign(buffer.String(), p.SignType, o.Key)
if err != nil {
return
}
// 签名
cfg.PaySign = sign
cfg.NonceStr = order.NonceStr
cfg.Timestamp = timestamp
cfg.PrePayID = order.PrePayID
cfg.SignType = p.SignType
cfg.Package = "prepay_id=" + order.PrePayID
return
}
// BridgeAppConfig get app bridge config
func (o *Order) BridgeAppConfig(p *Params) (cfg ConfigForApp, err error) {
var (
timestamp = strconv.FormatInt(time.Now().Unix(), 10)
noncestr = util.RandomStr(32)
_package = "Sign=WXPay"
)
order, err := o.PrePayOrder(p)
if err != nil {
return
}
result := map[string]string{
"appid": order.AppID,
"partnerid": order.MchID,
"prepayid": order.PrePayID,
"package": _package,
"noncestr": noncestr,
"timestamp": timestamp,
}
// 签名
sign, err := util.ParamSign(result, o.Key)
if err != nil {
return
}
result["sign"] = sign
cfg = ConfigForApp{
AppID: result["appid"],
MchID: result["partnerid"],
PrePayID: result["prepayid"],
Package: result["package"],
NonceStr: result["noncestr"],
Timestamp: result["timestamp"],
Sign: result["sign"],
}
return
}
// PrePayOrder return data for invoke wechat payment
func (o *Order) PrePayOrder(p *Params) (payOrder PreOrder, err error) {
nonceStr := util.RandomStr(32)
// 通知地址
if len(p.NotifyURL) == 0 {
p.NotifyURL = o.NotifyURL // 默认使用order.NotifyURL
}
// 签名类型
if p.SignType == "" {
p.SignType = util.SignTypeMD5
}
param := map[string]string{
"appid": o.AppID,
"body": p.Body,
"mch_id": o.MchID,
"nonce_str": nonceStr,
"out_trade_no": p.OutTradeNo,
"spbill_create_ip": p.CreateIP,
"total_fee": p.TotalFee,
"trade_type": p.TradeType,
"openid": p.OpenID,
"sign_type": p.SignType,
"detail": p.Detail,
"attach": p.Attach,
"goods_tag": p.GoodsTag,
"notify_url": p.NotifyURL,
}
if p.TimeExpire != "" {
// 如果有传入交易结束时间
param["time_expire"] = p.TimeExpire
}
sign, err := util.ParamSign(param, o.Key)
if err != nil {
return
}
request := new(payRequest).BridgePayRequest(p, o.AppID, o.MchID, nonceStr, sign)
if len(p.TimeExpire) > 0 {
// 如果有传入交易结束时间
request.TimeExpire = p.TimeExpire
}
rawRet, err := util.PostXML(payGateway, request)
if err != nil {
return
}
err = xml.Unmarshal(rawRet, &payOrder)
if err != nil {
return
}
if payOrder.ReturnCode == SUCCESS {
// pay success
if payOrder.ResultCode == SUCCESS {
err = nil
return
}
err = errors.New(payOrder.ErrCode + payOrder.ErrCodeDes)
return
}
err = errors.New("[msg : xmlUnmarshalError] [rawReturn : " + string(rawRet) + "] [sign : " + sign + "]")
return
}
// PrePayID will request wechat merchant api and request for a pre payment order id
func (o *Order) PrePayID(p *Params) (prePayID string, err error) {
order, err := o.PrePayOrder(p)
if err != nil {
return
}
if order.PrePayID == "" {
err = errors.New("empty prepayid")
}
prePayID = order.PrePayID
return
}