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main.go
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package alipay
import (
"sort"
"fmt"
"io"
"strings"
"net/url"
"crypto/md5"
)
var alipayGatewayNew = `https://mapi.alipay.com/gateway.do?`
type Config struct {
Partner string
Key string
}
type Request struct {
Service string
PaymentType string
NotifyUrl string
ReturnUrl string
OutTradeNo string
Subject string
TotalFee float64
Body string
ShowUrl string
SellerEmail string
}
type Response struct {
BuyerEmail string
OutTradeNo string
TradeStatus string
Subject string
TotalFee float64
}
type kvpair struct {
k, v string
}
type kvpairs []kvpair
func (t kvpairs) Less(i, j int) bool {
return t[i].k < t[j].k
}
func (t kvpairs) Swap(i, j int) {
t[i], t[j] = t[j], t[i]
}
func (t kvpairs) Len() int {
return len(t)
}
func (t kvpairs) Sort() {
sort.Sort(t)
}
func (t kvpairs) RemoveEmpty() (t2 kvpairs) {
for _, kv := range t {
if kv.v != "" {
t2 = append(t2, kv)
}
}
return
}
func (t kvpairs) Join() string {
var strs []string
for _, kv := range t {
strs = append(strs, kv.k+"="+kv.v)
}
return strings.Join(strs, "&")
}
func md5Sign(str, key string) string {
h := md5.New()
io.WriteString(h, str)
io.WriteString(h, key)
return fmt.Sprintf("%x", h.Sum(nil))
}
func verifySign(c Config, u url.Values) (err error) {
p := kvpairs{}
sign := ""
for k := range u {
v := u.Get(k)
switch k {
case "sign":
sign = v
continue
case "sign_type":
continue
}
p = append(p, kvpair{k, v})
}
if sign == "" {
err = fmt.Errorf("sign not found")
return
}
p = p.RemoveEmpty()
p.Sort()
fmt.Println(u)
if md5Sign(p.Join(), c.Key) != sign {
err = fmt.Errorf("sign invalid")
return
}
return
}
func ParseResponse(c Config, p url.Values) (r Response, err error) {
if err = verifySign(c, p); err != nil {
return
}
r.BuyerEmail = p.Get("buyer_email")
r.TradeStatus = p.Get("trade_status")
r.OutTradeNo = p.Get("out_trade_no")
r.Subject = p.Get("subject")
fmt.Sscanf(p.Get("total_fee"), "%f", &r.TotalFee)
if r.TradeStatus != "TRADE_SUCCESS" && r.TradeStatus != "TRADE_FINISHED" {
err = fmt.Errorf("trade not success or finnished")
return
}
return
}
func NewPage(c Config, r Request, w io.Writer) {
p := kvpairs {
kvpair{`_input_charset`, `utf-8`},
kvpair{`out_trade_no`, r.OutTradeNo},
kvpair{`partner`, c.Partner},
kvpair{`payment_type`, r.PaymentType},
kvpair{`notify_url`, r.NotifyUrl},
kvpair{`return_url`, r.ReturnUrl},
kvpair{`subject`, r.Subject},
kvpair{`total_fee`, fmt.Sprintf("%.2f", r.TotalFee)},
kvpair{`body`, r.Body},
kvpair{`service`, r.Service},
kvpair{`show_url`, r.ShowUrl},
kvpair{`seller_email`, r.SellerEmail},
}
p = p.RemoveEmpty()
p.Sort()
sign := md5Sign(p.Join(), c.Key)
p = append(p, kvpair{`sign`, sign})
p = append(p, kvpair{`sign_type`, `MD5`})
fmt.Fprintln(w, `<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head><body>`)
fmt.Fprintf(w, `<form name='alipaysubmit' action='%s_input_charset=utf-8' method='post'> `, alipayGatewayNew)
for _, kv := range p {
fmt.Fprintf(w, `<input type='hidden' name='%s' value='%s' />`, kv.k, kv.v)
}
fmt.Fprintln(w, `<script>document.forms['alipaysubmit'].submit();</script>`)
fmt.Fprintln(w, `</body></html>`)
}