285 lines
9.3 KiB
Go
285 lines
9.3 KiB
Go
package wechat
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import (
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"context"
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"crypto"
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"crypto/rand"
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"crypto/rsa"
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"crypto/sha256"
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"encoding/base64"
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"encoding/json"
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"fmt"
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"net/http"
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"runtime"
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"sort"
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"sync"
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"time"
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"github.com/go-pay/gopay"
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"github.com/go-pay/gopay/pkg/aes"
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"github.com/go-pay/gopay/pkg/errgroup"
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"github.com/go-pay/gopay/pkg/util"
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"github.com/go-pay/gopay/pkg/xhttp"
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"github.com/go-pay/gopay/pkg/xlog"
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"github.com/go-pay/gopay/pkg/xpem"
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"github.com/go-pay/gopay/pkg/xtime"
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)
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// 获取微信平台证书公钥（获取后自行保存使用，如需定期刷新功能，自行实现）
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// 注意事项
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// 如果自行实现验证平台签名逻辑的话，需要注意以下事项:
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// - 程序实现定期更新平台证书的逻辑，不要硬编码验证应答消息签名的平台证书
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// - 定期调用该接口，间隔时间小于12小时
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// - 加密请求消息中的敏感信息时，使用最新的平台证书（即：证书启用时间较晚的证书）
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// 文档说明：https://pay.weixin.qq.com/wiki/doc/apiv3/wechatpay/wechatpay5_1.shtml
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func GetPlatformCerts(ctx context.Context, mchid, apiV3Key, serialNo, privateKey string) (certs *PlatformCertRsp, err error) {
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var (
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eg = new(errgroup.Group)
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mu sync.Mutex
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jb = ""
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)
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// Prepare
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priKey, err := xpem.DecodePrivateKey([]byte(privateKey))
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if err != nil {
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return nil, err
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}
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timestamp := time.Now().Unix()
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nonceStr := util.RandomString(32)
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ts := util.Int642String(timestamp)
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_str := MethodGet + "\n" + v3GetCerts + "\n" + ts + "\n" + nonceStr + "\n" + jb + "\n"
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// Sign
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h := sha256.New()
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h.Write([]byte(_str))
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result, err := rsa.SignPKCS1v15(rand.Reader, priKey, crypto.SHA256, h.Sum(nil))
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if err != nil {
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return nil, fmt.Errorf("[%w]: %+v", gopay.SignatureErr, err)
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}
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sign := base64.StdEncoding.EncodeToString(result)
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// Authorization
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authorization := Authorization + ` mchid="` + mchid + `",nonce_str="` + nonceStr + `",timestamp="` + ts + `",serial_no="` + serialNo + `",signature="` + sign + `"`
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// Request
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var url = v3BaseUrlCh + v3GetCerts
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httpClient := xhttp.NewClient()
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httpClient.Header.Add(HeaderAuthorization, authorization)
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httpClient.Header.Add(HeaderRequestID, fmt.Sprintf("%s-%d", util.RandomString(21), time.Now().Unix()))
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httpClient.Header.Add(HeaderSerial, serialNo)
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httpClient.Header.Add("Accept", "*/*")
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res, bs, err := httpClient.Type(xhttp.TypeJSON).Get(url).EndBytes(ctx)
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if err != nil {
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return nil, err
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}
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certs = &PlatformCertRsp{Code: Success}
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if res.StatusCode != http.StatusOK {
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certs.Code = res.StatusCode
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certs.Error = string(bs)
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return certs, nil
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}
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// Parse
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certRsp := new(PlatformCert)
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if err = json.Unmarshal(bs, certRsp); err != nil {
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return nil, fmt.Errorf("json.Unmarshal(%s)：%+v", string(bs), err)
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}
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for _, v := range certRsp.Data {
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cert := v
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if cert.EncryptCertificate != nil {
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ec := cert.EncryptCertificate
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eg.Go(func(ctx context.Context) error {
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cipherBytes, _ := base64.StdEncoding.DecodeString(ec.Ciphertext)
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pubKeyBytes, err := aes.GCMDecrypt(cipherBytes, []byte(ec.Nonce), []byte(ec.AssociatedData), []byte(apiV3Key))
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if err != nil {
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return fmt.Errorf("aes.GCMDecrypt, err:%+v", err)
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}
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pci := &PlatformCertItem{
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EffectiveTime: cert.EffectiveTime,
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ExpireTime: cert.ExpireTime,
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PublicKey: string(pubKeyBytes),
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SerialNo: cert.SerialNo,
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}
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mu.Lock()
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certs.Certs = append(certs.Certs, pci)
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mu.Unlock()
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return nil
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})
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}
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}
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if err = eg.Wait(); err != nil {
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return nil, err
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}
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return certs, nil
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}
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// 设置 微信支付平台证书 和 证书序列号
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// 注意1：如已开启自动验签功能 client.AutoVerifySign()，无需再调用此方法设置
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// 注意2：请预先通过 wechat.GetPlatformCerts() 获取 微信平台公钥证书 和 证书序列号
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// 部分接口请求参数中敏感信息加密，使用此 微信支付平台公钥 和 证书序列号
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func (c *ClientV3) SetPlatformCert(wxPublicKeyContent []byte, wxSerialNo string) (client *ClientV3) {
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pubKey, err := xpem.DecodePublicKey(wxPublicKeyContent)
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if err != nil {
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xlog.Errorf("SetPlatformCert(%s),err:%+v", wxPublicKeyContent, err)
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}
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if pubKey != nil {
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c.wxPublicKey = pubKey
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}
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c.WxSerialNo = wxSerialNo
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return c
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}
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// 获取 微信平台证书（readonly）
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func (c *ClientV3) WxPublicKey() (wxPublicKey *rsa.PublicKey) {
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wxPublicKey = c.wxPublicKey
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return
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}
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// 获取并选择最新的有效证书
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func (c *ClientV3) GetAndSelectNewestCert() (cert, serialNo string, err error) {
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certs, err := c.getPlatformCerts()
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if err != nil {
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return gopay.NULL, gopay.NULL, err
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}
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if certs.Code == Success && len(certs.Certs) > 0 {
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// only one
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if len(certs.Certs) == 1 {
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formatExpire := xtime.FormatDateTime(certs.Certs[0].ExpireTime)
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expireTime, err := time.ParseInLocation(xtime.TimeLayout, formatExpire, time.Local)
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if err != nil {
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return gopay.NULL, gopay.NULL, fmt.Errorf("time.ParseInLocation(%s, %s),err:%w", xtime.TimeLayout, formatExpire, err)
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}
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if time.Now().Unix() >= expireTime.Unix() {
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// 过期了
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return gopay.NULL, gopay.NULL, fmt.Errorf("wechat platform API cert expired, expired time: %s", formatExpire)
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}
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return certs.Certs[0].PublicKey, certs.Certs[0].SerialNo, nil
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}
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// more one
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var (
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effectiveTs []int
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certMap = make(map[int]*PlatformCertItem)
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)
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for _, v := range certs.Certs {
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formatEffective := xtime.FormatDateTime(v.EffectiveTime)
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effectiveTime, err := time.ParseInLocation(xtime.TimeLayout, formatEffective, time.Local)
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if err != nil {
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return gopay.NULL, gopay.NULL, fmt.Errorf("time.ParseInLocation(%s, %s),err:%w", xtime.TimeLayout, formatEffective, err)
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}
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eu := int(effectiveTime.Unix())
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effectiveTs = append(effectiveTs, eu)
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certMap[eu] = v
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}
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sort.Ints(effectiveTs)
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// newest cert
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newestCert := certMap[effectiveTs[len(effectiveTs)-1]]
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formatExpire := xtime.FormatDateTime(newestCert.ExpireTime)
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expireTime, err := time.ParseInLocation(xtime.TimeLayout, formatExpire, time.Local)
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if err != nil {
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return gopay.NULL, gopay.NULL, fmt.Errorf("time.ParseInLocation(%s, %s),err:%w", xtime.TimeLayout, formatExpire, err)
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}
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if time.Now().Unix() >= expireTime.Unix() {
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// 过期了
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return gopay.NULL, gopay.NULL, fmt.Errorf("wechat platform API cert expired, expired time: %s", formatExpire)
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}
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return newestCert.PublicKey, newestCert.SerialNo, nil
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}
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// failed
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return gopay.NULL, gopay.NULL, fmt.Errorf("GetAndSelectNewestCert() failed or certs is nil: %+v", certs)
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}
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// 推荐直接使用 client.GetAndSelectNewestCert() 方法
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// 获取微信平台证书公钥（获取后自行保存使用，如需定期刷新功能，自行实现）
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// 注意事项
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// 如果自行实现验证平台签名逻辑的话，需要注意以下事项:
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// - 程序实现定期更新平台证书的逻辑，不要硬编码验证应答消息签名的平台证书
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// - 定期调用该接口，间隔时间小于12小时
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// - 加密请求消息中的敏感信息时，使用最新的平台证书（即：证书启用时间较晚的证书）
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// 文档说明：https://pay.weixin.qq.com/wiki/doc/apiv3/wechatpay/wechatpay5_1.shtml
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func (c *ClientV3) getPlatformCerts() (certs *PlatformCertRsp, err error) {
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var (
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eg = new(errgroup.Group)
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mu sync.Mutex
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)
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authorization, err := c.authorization(MethodGet, v3GetCerts, nil)
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if err != nil {
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return nil, err
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}
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res, _, bs, err := c.doProdGet(c.ctx, v3GetCerts, authorization)
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if err != nil {
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return nil, err
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}
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certs = &PlatformCertRsp{Code: Success}
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if res.StatusCode != http.StatusOK {
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certs.Code = res.StatusCode
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certs.Error = string(bs)
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return certs, nil
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}
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certRsp := new(PlatformCert)
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if err = json.Unmarshal(bs, certRsp); err != nil {
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return nil, fmt.Errorf("json.Unmarshal(%s)：%+v", string(bs), err)
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}
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for _, v := range certRsp.Data {
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cert := v
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if cert.EncryptCertificate != nil {
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ec := cert.EncryptCertificate
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eg.Go(func(ctx context.Context) error {
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pubKey, err := c.decryptCerts(ec.Ciphertext, ec.Nonce, ec.AssociatedData)
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if err != nil {
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return err
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}
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pci := &PlatformCertItem{
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EffectiveTime: cert.EffectiveTime,
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ExpireTime: cert.ExpireTime,
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PublicKey: pubKey,
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SerialNo: cert.SerialNo,
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}
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mu.Lock()
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certs.Certs = append(certs.Certs, pci)
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mu.Unlock()
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return nil
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})
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}
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}
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if err = eg.Wait(); err != nil {
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return nil, err
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}
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return certs, nil
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}
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// 解密加密的证书
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func (c *ClientV3) decryptCerts(ciphertext, nonce, additional string) (wxCerts string, err error) {
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cipherBytes, _ := base64.StdEncoding.DecodeString(ciphertext)
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decrypt, err := aes.GCMDecrypt(cipherBytes, []byte(nonce), []byte(additional), c.ApiV3Key)
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if err != nil {
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return "", fmt.Errorf("aes.GCMDecrypt, err:%w", err)
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}
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return string(decrypt), nil
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}
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func (c *ClientV3) autoCheckCertProc() {
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defer func() {
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if r := recover(); r != nil {
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buf := make([]byte, 64<<10)
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buf = buf[:runtime.Stack(buf, false)]
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xlog.Errorf("autoCheckCertProc: panic recovered: %s\n%s", r, buf)
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// 重启
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c.autoCheckCertProc()
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}
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}()
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for {
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time.Sleep(time.Hour * 12)
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wxPk, wxSerialNo, err := c.GetAndSelectNewestCert()
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if err != nil {
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xlog.Errorf("c.GetAndSelectNewestCert()，err:%+v", err)
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continue
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}
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// decode cert
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pubKey, err := xpem.DecodePublicKey([]byte(wxPk))
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if err != nil {
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xlog.Errorf("xpem.DecodePublicKey(%s)，err:%+v", wxPk, err)
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continue
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}
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c.wxPublicKey = pubKey
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c.WxSerialNo = wxSerialNo
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}
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}
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