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alipay.go
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alipay.go
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package alipay
import (
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/sha1"
"crypto/tls"
"crypto/x509"
"encoding/base64"
"encoding/pem"
"errors"
"fmt"
"io"
"io/ioutil"
"log"
"net/http"
"net/url"
"strings"
)
// http://doc.open.alipay.com/doc2/detail?spm=0.0.0.0.1LPUGt&treeId=63&articleId=103758&docType=1
var AlipayGateway = "https://mapi.alipay.com/gateway.do?"
var LogPrefix = "[Alipay]"
var ErrNotFoundNotifyID = errors.New("not found notify_id")
var ErrReturnDataIsEmpty = errors.New("return data is empty")
var ErrNotifyDataIsEmpty = errors.New("notify data is empty")
type Alipay struct {
partner string
key string
email string
publicKey *rsa.PublicKey
privateKey *rsa.PrivateKey
}
func NewPayment(partner, key, email string) *Alipay {
a := &Alipay{
partner: partner,
key: key,
email: email,
}
return a
}
func (a *Alipay) InitRSA(pubPath, priPath string) *Alipay {
var (
err error
publicKey *rsa.PublicKey
privateKey *rsa.PrivateKey
)
publicKey, err = newPublicKey(pubPath)
if err != nil {
log.Fatal(err)
}
privateKey, err = newPrivateKey(priPath)
if err != nil {
log.Fatal(err)
}
a.publicKey = publicKey
a.privateKey = privateKey
return a
}
func newPublicKey(path string) (pub *rsa.PublicKey, err error) {
// Read the verify sign certification key
pemData, err := ioutil.ReadFile(path)
if err != nil {
return
}
// Extract the PEM-encoded data block
block, _ := pem.Decode(pemData)
if block == nil {
err = fmt.Errorf("%s bad key data: %s", LogPrefix, "not PEM-encoded")
return
}
// if got, want := block.Type, "CERTIFICATE"; got != want {
// err = fmt.Errorf("%s unknown key type %q, want %q", LogPrefix, got, want)
// return
// }
// Decode the certification
//cert, err = x509.ParseCertificate(block.Bytes)
pubInterface, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
err = fmt.Errorf("%s bad public key: %s", LogPrefix, err)
return
}
pub = pubInterface.(*rsa.PublicKey)
return
}
func newPrivateKey(path string) (priKey *rsa.PrivateKey, err error) {
// Read the private key
pemData, err := ioutil.ReadFile(path)
if err != nil {
err = fmt.Errorf("%s read key file: %s", LogPrefix, err)
return
}
// Extract the PEM-encoded data block
block, _ := pem.Decode(pemData)
if block == nil {
err = fmt.Errorf("%s bad key data: %s", LogPrefix, "not PEM-encoded")
return
}
if got, want := block.Type, "RSA PRIVATE KEY"; got != want {
err = fmt.Errorf("%s unknown key type %q, want %q", LogPrefix, got, want)
return
}
// Decode the RSA private key
priKey, err = x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
err = fmt.Errorf("%s bad private key: %s", LogPrefix, err)
return
}
return
}
func (a *Alipay) rsaSign(kvs KVpairs) (sig string, err error) {
h := sha1.New()
io.WriteString(h, kvs.RemoveEmpty().Sort().Join("&"))
hashed := h.Sum(nil)
rsaSign, err := rsa.SignPKCS1v15(rand.Reader, a.privateKey, crypto.SHA1, hashed)
if err != nil {
return
}
sig = base64.StdEncoding.EncodeToString(rsaSign)
return
}
func (a *Alipay) rsaVerify(vals url.Values, fields []string) (err error) {
var signature, notifyID string
kvs := KVpairs{}
for key := range vals {
if len(fields) > 0 && !Contains(fields, key) {
continue
}
if key == "sign" {
signature, _ = url.QueryUnescape(vals.Get(key))
continue
}
if key == "sign_type" {
continue
}
if key == "notify_id" {
notifyID, _ = url.QueryUnescape(vals.Get(key))
}
var k, v string
k, err = url.QueryUnescape(key)
if err != nil {
return
}
v, err = url.QueryUnescape(vals.Get(key))
if err != nil {
return
}
kvs = append(kvs, KVpair{K: k, V: v})
}
hashed := SHA1([]byte(kvs.RemoveEmpty().Sort().Join("&")))
var inSign []byte
inSign, err = base64.StdEncoding.DecodeString(signature)
if err != nil {
return
}
err = rsa.VerifyPKCS1v15(a.publicKey, crypto.SHA1, hashed, inSign)
if err != nil {
return
}
err = a.checkNotify(notifyID)
if err != nil {
return
}
return
}
// verify 判断过来的参数是否有效
// TODO 只把支付非空参数加入验证 它把我传的参数也带过来了!!!!!!!!!!!
func (a *Alipay) verify(vals url.Values, fields []string) (err error) {
var signature, notifyID string
kvs := KVpairs{}
for key := range vals {
if len(fields) > 0 && !Contains(fields, key) {
continue
}
val := vals.Get(key)
if key == "sign" {
signature = val
continue
}
if key == "sign_type" {
continue
}
if key == "notify_id" {
notifyID = val
}
/*
var v string
v, err = url.QueryUnescape(val)
if err != nil {
return
}
*/kvs = append(kvs, KVpair{K: key, V: val})
}
signStr := MD5(kvs.RemoveEmpty().Sort().Join("&"), a.key)
if signStr != signature {
err = fmt.Errorf("%s illegal signature, want %s, got %s", LogPrefix, signature, signStr)
return
}
err = a.checkNotify(notifyID)
if err != nil {
return
}
return
}
/*
checkNotify 直接访问支付宝借口判断请求是否有效
得到的处理结果有两种:
成功时:true
不成功时:报对应错误
*/
func (a *Alipay) checkNotify(notifyID string) (err error) {
if notifyID == "" {
err = ErrNotFoundNotifyID
return
}
vals := url.Values{}
vals.Set("service", "notify_verify")
vals.Set("partner", a.partner)
vals.Set("notify_id", notifyID)
r, err := http.NewRequest("GET", AlipayGateway+vals.Encode(), nil)
if err != nil {
return
}
client := &http.Client{
Transport: &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
DisableCompression: true,
},
}
resp, err := client.Do(r)
if err != nil {
return
}
defer resp.Body.Close()
var body []byte
body, err = ioutil.ReadAll(resp.Body)
if err != nil {
return
}
if string(body) != "true" {
err = fmt.Errorf("%s illegal notify.%s got %s", LogPrefix, AlipayGateway+vals.Encode(), string(body))
return
}
return
}
func parsePostData(req *http.Request) (vals url.Values, err error) {
var formStr = []byte(req.Form.Encode())
if len(formStr) > 0 {
var fields []string
fields = strings.Split(string(formStr), "&")
vals = url.Values{}
data := map[string]string{}
for _, field := range fields {
f := strings.SplitN(field, "=", 2)
key, val := f[0], f[1]
data[key] = val
vals.Set(key, val)
}
}
return
}