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alipay_sign_verification.go
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alipay_sign_verification.go
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package alipay
import (
"crypto"
"crypto/rsa"
"crypto/x509"
"encoding/base64"
"errors"
"fmt"
"github.com/google/go-querystring/query"
"os"
"sort"
"strings"
)
/**
* @author: Sam
* @since:
* @date: 2023/3/14 17:50
* @desc: 签名和验签
*/
type Signer interface {
// SetSignContent 设置待签名的数据
SetSignContent(*CommonReqParam)
// Sign 生成签名
Sign() (string, error)
// Encode url.encode
Encode() (string, error)
}
type Verifier interface {
// VerifySign 校验签名
VerifySign(scene VerificationScene, sign string, buff []byte, otherParam ...string) error
}
type SignVerifier interface {
Signer
Verifier
}
// 待验证buff
type responseBuff []byte
// GetWaitSignData 获取待验证的字符串
func (r responseBuff) GetWaitSignData() (string, error) {
str := string(r)
// {"alipay_trade_query_response":
indexStart := strings.Index(str, `_response":`) + 11
indexEnd := strings.Index(str, `,"alipay_cert_sn":`)
if indexEnd > 0 && indexEnd > indexStart {
return str[indexStart:indexEnd], nil
}
indexEnd = strings.Index(str, `,"sign":`)
if indexEnd < 0 {
return "", ErrNotContainsSignData
}
return str[indexStart:indexEnd], nil
}
/*
IsBizSuccess 判断业务请求是否成功
{
"error_response": {
"code": "40002",
"msg": "Invalid Arguments",
"sub_code": "isv.isv.grant-type-invalid",
"sub_msg": "grant_type参数不正确"
},
"alipay_cert_sn": "e97e0b247e2637dac32fe3989c73e1eb",
"sign": "AxoPq1O"
}
*/
func (r responseBuff) IsErrorResponse() bool {
str := string(r)
indexStart := strings.Index(str, `error_response":`)
return indexStart > -1
}
// IsHtmlError 是否报错,有时直接返回html界面
func (r responseBuff) IsHtmlError() bool {
str := string(r)
return strings.Contains(str, `<html>`)
}
type Signature struct {
// 应用id
appId string
// 应用私钥
appPrivateKey *rsa.PrivateKey
waitSignContent *CommonReqParam
}
func (r *Signature) SetSignContent(param *CommonReqParam) {
param.AppId = r.appId
r.waitSignContent = param
}
func (r *Signature) Encode() (string, error) {
tempParam := r.waitSignContent
sign, err := r.Sign()
if err != nil {
return "", err
}
tempParam.Sign = sign
param, err := query.Values(tempParam)
if err != nil {
return "", err
}
return param.Encode(), nil
}
func (r *Signature) Sign() (string, error) {
values, err := query.Values(r.waitSignContent)
if err != nil {
return "", err
}
valueList := make([]string, 0, len(values))
for key := range values {
var value = strings.TrimSpace(values.Get(key))
if len(value) > 0 {
valueList = append(valueList, key+"="+value)
}
}
sort.Strings(valueList)
var src = strings.Join(valueList, "&")
sign, err := RSASignWithKey([]byte(src), r.appPrivateKey, crypto.SHA256)
if err != nil {
return "", err
}
signStr := base64.StdEncoding.EncodeToString(sign)
return signStr, nil
}
type NormalRSA2SignStrategy struct {
Signature
appPublicKey *rsa.PublicKey
// 公钥
aliPayPublicKey *rsa.PublicKey
}
func NewNormalRSA2SignStrategy(appId, privateKey, publicKey, aliPayPublicKey string) SignVerifier {
var appPrivateKey *rsa.PrivateKey
var appPublicKey *rsa.PublicKey
var err error
if appPrivateKey, err = ParsePKCS1PrivateKey(FormatPKCS1PrivateKey(privateKey)); err != nil {
if appPrivateKey, err = ParsePKCS8PrivateKey(FormatPKCS8PrivateKey(privateKey)); err != nil {
panic(err)
}
}
if appPublicKey, err = ParsePublicKey(FormatPublicKey(publicKey)); err != nil {
panic(err)
}
var aliPublicKey *rsa.PublicKey
if aliPublicKey, err = ParsePublicKey(FormatPublicKey(aliPayPublicKey)); err != nil {
panic(err)
}
strategy := &NormalRSA2SignStrategy{
Signature: Signature{appId: appId, appPrivateKey: appPrivateKey},
appPublicKey: appPublicKey,
aliPayPublicKey: aliPublicKey,
}
return strategy
}
func (r *NormalRSA2SignStrategy) Encode() (string, error) {
tempParam := r.waitSignContent
sign, err := r.Sign()
if err != nil {
return "", err
}
tempParam.Sign = sign
param, err := query.Values(tempParam)
if err != nil {
return "", err
}
return param.Encode(), nil
}
func (r *NormalRSA2SignStrategy) VerifySign(scene VerificationScene, sign string, buff []byte, otherParam ...string) error {
var err error
var signBytes []byte
if signBytes, err = base64.StdEncoding.DecodeString(sign); err != nil {
return err
}
waitSignBuff := buff
if scene == SyncVerificationScene {
var waitSignData string
if waitSignData, err = responseBuff(buff).GetWaitSignData(); err != nil {
return err
}
waitSignBuff = []byte(waitSignData)
}
return RSAVerifyWithKey(waitSignBuff, signBytes, r.aliPayPublicKey, crypto.SHA256)
}
type CertSignStrategy struct {
Signature
// 应用公钥证书 SN
appCertSN string
// 支付宝根证书 SN
alipayRootCertSn string
// 支付宝公钥证书序列号
alipayPublicCertSN string
// 支付宝公钥证书序列号=>支付宝公钥证书
alipayPublicKeyList map[string]*rsa.PublicKey
alipayPublicKey *rsa.PublicKey
}
func NewCertSignStrategy(appId, privateKey, appPublicCert, alipayRootCert, alipayPublicCert string) SignVerifier {
var err error
object := &CertSignStrategy{alipayPublicKeyList: make(map[string]*rsa.PublicKey, 0)}
if err = object.LoadAppPublicCertFile(appPublicCert); err != nil {
panic(err)
}
if err = object.LoadRootCertFile(alipayRootCert); err != nil {
panic(err)
}
if err = object.LoadPublicCertFile(alipayPublicCert); err != nil {
panic(err)
}
var appPrivateKey *rsa.PrivateKey
if appPrivateKey, err = ParsePKCS1PrivateKey(FormatPKCS1PrivateKey(privateKey)); err != nil {
if appPrivateKey, err = ParsePKCS8PrivateKey(FormatPKCS8PrivateKey(privateKey)); err != nil {
panic(err)
}
}
object.Signature = Signature{appId: appId, appPrivateKey: appPrivateKey}
return object
}
// LoadAppPublicCertFile 加载应用公钥证书
func (r *CertSignStrategy) LoadAppPublicCertFile(filename string) error {
buff, err := os.ReadFile(filename)
if err != nil {
return err
}
cert, err := ParseCertificate(buff)
if err != nil {
return err
}
r.appCertSN = GetCertSN(cert)
return nil
}
// LoadRootCertFile 加载支付宝根证书
func (r *CertSignStrategy) LoadRootCertFile(filename string) error {
buff, err := os.ReadFile(filename)
if err != nil {
return err
}
var certStrList = strings.Split(string(buff), CertificateEnd)
certSNSlice := make([]string, 0, len(certStrList))
for _, certStr := range certStrList {
certStr = certStr + CertificateEnd
cert, _ := ParseCertificate([]byte(certStr))
if cert != nil && (cert.SignatureAlgorithm == x509.SHA256WithRSA || cert.SignatureAlgorithm == x509.SHA1WithRSA) {
certSNSlice = append(certSNSlice, GetCertSN(cert))
}
}
r.alipayRootCertSn = strings.Join(certSNSlice, "_")
return nil
}
// LoadPublicCertFile 加载支付宝公钥证书
func (r *CertSignStrategy) LoadPublicCertFile(filename string) error {
buff, err := os.ReadFile(filename)
if err != nil {
return err
}
cert, err := ParseCertificate(buff)
if err != nil {
return err
}
key, ok := cert.PublicKey.(*rsa.PublicKey)
if !ok {
return ErrTrans
}
r.alipayPublicCertSN = GetCertSN(cert)
r.alipayPublicKeyList[r.alipayPublicCertSN] = key
r.alipayPublicKey = key
return nil
}
func (r *CertSignStrategy) SetSignContent(param *CommonReqParam) {
param.AlipayRootCertSn = r.alipayRootCertSn
param.AppCertSn = r.appCertSN
param.AppId = r.appId
r.waitSignContent = param
}
// VerifySign 异步通知验签 公钥、证书两种模式下,异步通知验签方式相同
func (r *CertSignStrategy) VerifySign(scene VerificationScene, sign string, buff []byte, otherParam ...string) error {
var err error
var signBytes []byte
if signBytes, err = base64.StdEncoding.DecodeString(sign); err != nil {
return err
}
if scene == SyncVerificationScene {
if len(otherParam) == 0 {
return errors.New("缺少app_cert_sn参数")
}
waitSignData, err := responseBuff(buff).GetWaitSignData()
if err != nil {
return err
}
publicKey := r.alipayPublicKeyList[otherParam[0]]
if publicKey == nil {
return fmt.Errorf("证书序列号:%s,对应的公钥证书不存在", otherParam[0])
}
return RSAVerifyWithKey([]byte(waitSignData), signBytes, publicKey, crypto.SHA256)
}
return RSAVerifyWithKey(buff, signBytes, r.alipayPublicKey, crypto.SHA256)
}