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wxpay.go
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wxpay.go
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package wxpay
import (
"bytes"
"crypto/md5"
"crypto/tls"
"encoding/hex"
"encoding/pem"
"encoding/xml"
"errors"
"io/ioutil"
"math/rand"
"net/http"
"net/url"
"sort"
"strings"
"time"
"golang.org/x/crypto/pkcs12"
)
type Client struct {
appId string
apiKey string
mchId string
Client *http.Client
tlsClient *http.Client
apiDomain string
NotifyURL string
isProduction bool
}
func New(appId, apiKey, mchId string, isProduction bool) (client *Client) {
client = &Client{}
client.appId = appId
client.mchId = mchId
client.apiKey = apiKey
client.Client = http.DefaultClient
client.isProduction = isProduction
if isProduction {
client.apiDomain = kProductionURL
} else {
client.apiDomain = kSandboxURL
}
return client
}
func initTLSClient(cert []byte, password string) (tlsClient *http.Client, err error) {
if len(cert) > 0 {
cert, err := pkcs12ToPem(cert, password)
if err != nil {
return nil, err
}
config := &tls.Config{
Certificates: []tls.Certificate{cert},
}
transport := &http.Transport{
TLSClientConfig: config,
DisableCompression: true,
}
tlsClient = &http.Client{Transport: transport}
}
return tlsClient, err
}
func (this *Client) LoadCert(path string) (err error) {
if len(path) == 0 {
return ErrNotFoundCertFile
}
cert, err := ioutil.ReadFile(path)
if err != nil {
return err
}
tlsClient, err := initTLSClient(cert, this.mchId)
if err != nil {
return err
}
this.tlsClient = tlsClient
return nil
}
func (this *Client) URLValues(param Param, key string) (value url.Values, err error) {
var p = param.Params()
if appId := p.Get("appid"); appId == "" {
p.Set("appid", this.appId)
}
p.Set("mch_id", this.mchId)
p.Set("nonce_str", GetNonceStr())
if _, ok := p["notify_url"]; ok == false {
if len(this.NotifyURL) > 0 {
p.Set("notify_url", this.NotifyURL)
}
}
var sign = SignMD5(p, key)
p.Set("sign", sign)
return p, nil
}
func (this *Client) doRequest(method, url string, param Param, result interface{}) (err error) {
return this.doRequestWithClient(this.Client, method, url, param, result)
}
func (this *Client) doRequestWithTLS(method, url string, param Param, result interface{}) (err error) {
if this.tlsClient == nil {
return ErrNotFoundTLSClient
}
return this.doRequestWithClient(this.tlsClient, method, url, param, result)
}
func (this *Client) doRequestWithClient(client *http.Client, method, url string, param Param, result interface{}) (err error) {
key, err := this.getKey()
if err != nil {
return err
}
p, err := this.URLValues(param, key)
if err != nil {
return err
}
req, err := http.NewRequest(method, url, strings.NewReader(URLValueToXML(p)))
if err != nil {
return err
}
req.Header.Set("Accept", "application/xml")
req.Header.Set("Content-Type", "application/xml;charset=utf-8")
resp, err := client.Do(req)
if resp != nil {
defer resp.Body.Close()
}
if err != nil {
return err
}
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return err
}
if _, err := VerifyResponseData(data, key); err != nil {
return err
}
err = xml.Unmarshal(data, result)
return err
}
func (this *Client) DoRequest(method, url string, param Param, results interface{}) (err error) {
return this.doRequest(method, url, param, results)
}
func (this *Client) getKey() (key string, err error) {
if this.isProduction == false {
key, err = this.getSignKey(this.apiKey)
if err != nil {
return "", err
}
} else {
key = this.apiKey
}
return key, err
}
func (this *Client) SignMD5(param url.Values) (sign string) {
return SignMD5(param, this.apiKey)
}
func (this *Client) getSignKey(apiKey string) (key string, err error) {
var p = make(url.Values)
p.Set("mch_id", this.mchId)
p.Set("nonce_str", GetNonceStr())
var sign = SignMD5(p, apiKey)
p.Set("sign", sign)
req, err := http.NewRequest("POST", "https://api.mch.weixin.qq.com/sandboxnew/pay/getsignkey", strings.NewReader(URLValueToXML(p)))
if err != nil {
return "", err
}
req.Header.Set("Accept", "application/xml")
req.Header.Set("Content-Type", "application/xml;charset=utf-8")
resp, err := this.Client.Do(req)
if resp != nil {
defer resp.Body.Close()
}
if err != nil {
return "", err
}
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", err
}
var signKey *GetSignKeyRsp
if err = xml.Unmarshal(data, &signKey); err != nil {
return "", err
}
return signKey.SandboxSignKey, nil
}
func (this *Client) BuildAPI(paths ...string) string {
var path = this.apiDomain
for _, p := range paths {
p = strings.TrimSpace(p)
if len(p) > 0 {
if strings.HasSuffix(path, "/") {
path = path + p
} else {
if strings.HasPrefix(p, "/") {
path = path + p
} else {
path = path + "/" + p
}
}
}
}
return path
}
func URLValueToXML(m url.Values) string {
var xmlBuffer = &bytes.Buffer{}
xmlBuffer.WriteString("<xml>")
for key := range m {
var value = m.Get(key)
if key == "total_fee" || key == "refund_fee" || key == "execute_time_" {
xmlBuffer.WriteString("<" + key + ">" + value + "</" + key + ">")
} else {
xmlBuffer.WriteString("<" + key + "><![CDATA[" + value + "]]></" + key + ">")
}
}
xmlBuffer.WriteString("</xml>")
return xmlBuffer.String()
}
func SignMD5(param url.Values, key string) (sign string) {
var pList = make([]string, 0, 0)
for key := range param {
var value = param.Get(key)
if len(value) > 0 {
pList = append(pList, key+"="+value)
}
}
sort.Strings(pList)
if key != "" {
pList = append(pList, "key="+key)
}
var src = strings.Join(pList, "&")
md5Ctx := md5.New()
md5Ctx.Write([]byte(src))
cipherStr := md5Ctx.Sum(nil)
sign = strings.ToUpper(hex.EncodeToString(cipherStr))
return sign
}
func VerifyResponseData(data []byte, key string) (ok bool, err error) {
var param = make(XMLMap)
err = xml.Unmarshal(data, ¶m)
if err != nil {
return false, err
}
return VerifyResponseValues(url.Values(param), key)
}
func VerifyResponseValues(param url.Values, key string) (bool, error) {
// 处理错误信息
var code = param.Get("return_code")
if code == K_RETURN_CODE_FAIL {
var msg = param.Get("return_msg")
if msg == "" {
msg = param.Get("retmsg")
}
return false, errors.New(msg)
}
code = param.Get("result_code")
if code == K_RETURN_CODE_FAIL {
var msg = param.Get("err_code_des")
return false, errors.New(msg)
}
// 验证签名
var sign = param.Get("sign")
delete(param, "sign")
if sign == "" {
return false, errors.New("签名验证失败")
}
var sign2 = SignMD5(param, key)
if sign == sign2 {
return true, nil
}
return false, errors.New("签名验证失败")
}
func GetNonceStr() (nonceStr string) {
chars := "abcdefghijklmnopqrstuvwxyz0123456789"
var r = rand.New(rand.NewSource(time.Now().UnixNano()))
for i := 0; i < 32; i++ {
idx := r.Intn(len(chars) - 1)
nonceStr += chars[idx : idx+1]
}
return nonceStr
}
func pkcs12ToPem(p12 []byte, password string) (cert tls.Certificate, err error) {
blocks, err := pkcs12.ToPEM([]byte(p12), password)
if err != nil {
return cert, err
}
var pemData []byte
for _, b := range blocks {
pemData = append(pemData, pem.EncodeToMemory(b)...)
}
cert, err = tls.X509KeyPair(pemData, pemData)
return cert, err
}