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client.go
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client.go
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package wxpay
import (
"bytes"
"crypto/md5"
"crypto/tls"
"crypto/x509"
"encoding/hex"
"encoding/xml"
"errors"
"io"
"io/ioutil"
"net/http"
"sort"
"strings"
"time"
)
const bodyType = "application/xml; charset=utf-8"
// API客户端
type Client struct {
stdClient *http.Client
tlsClient *http.Client
AppId string
MchId string
ApiKey string
}
// 实例化API客户端
func NewClient(appId, mchId, apiKey string) *Client {
return &Client{
stdClient: &http.Client{},
AppId: appId,
MchId: mchId,
ApiKey: apiKey,
}
}
// 设置请求超时时间
func (c *Client) SetTimeout(d time.Duration) {
c.stdClient.Timeout = d
if c.tlsClient != nil {
c.tlsClient.Timeout = d
}
}
// 附着商户证书
func (c *Client) WithCert(certFile, keyFile, rootcaFile string) error {
cert, err := ioutil.ReadFile(certFile)
if err != nil {
return err
}
key, err := ioutil.ReadFile(keyFile)
if err != nil {
return err
}
rootca, err := ioutil.ReadFile(rootcaFile)
if err != nil {
return err
}
return c.WithCertBytes(cert, key, rootca)
}
func (c *Client) WithCertBytes(cert, key, rootca []byte) error {
tlsCert, err := tls.X509KeyPair(cert, key)
if err != nil {
return err
}
pool := x509.NewCertPool()
ok := pool.AppendCertsFromPEM(rootca)
if !ok {
return errors.New("failed to parse root certificate")
}
conf := &tls.Config{
Certificates: []tls.Certificate{tlsCert},
RootCAs: pool,
}
trans := &http.Transport{
TLSClientConfig: conf,
}
c.tlsClient = &http.Client{
Transport: trans,
}
return nil
}
// 发送请求
func (c *Client) Post(url string, params Params, tls bool) (Params, error) {
var httpc *http.Client
if tls {
if c.tlsClient == nil {
return nil, errors.New("tls client is not initialized")
}
httpc = c.tlsClient
} else {
httpc = c.stdClient
}
resp, err := httpc.Post(url, bodyType, c.Encode(params))
if err != nil {
return nil, err
}
return c.Decode(resp.Body), nil
}
// XML解码
func (c *Client) Decode(r io.Reader) Params {
var (
d *xml.Decoder
start *xml.StartElement
params Params
)
d = xml.NewDecoder(r)
params = make(Params)
for {
tok, err := d.Token()
if err != nil {
break
}
switch t := tok.(type) {
case xml.StartElement:
start = &t
case xml.CharData:
if t = bytes.TrimSpace(t); len(t) > 0 {
params.SetString(start.Name.Local, string(t))
}
}
}
return params
}
// XML编码
func (c *Client) Encode(params Params) io.Reader {
var buf bytes.Buffer
buf.WriteString(`<xml>`)
for k, v := range params {
buf.WriteString(`<`)
buf.WriteString(k)
buf.WriteString(`><![CDATA[`)
buf.WriteString(v)
buf.WriteString(`]]></`)
buf.WriteString(k)
buf.WriteString(`>`)
}
buf.WriteString(`</xml>`)
return &buf
}
// 验证签名
func (c *Client) CheckSign(params Params) bool {
return params.GetString("sign") == c.Sign(params)
}
// 生成签名
func (c *Client) Sign(params Params) string {
var keys = make([]string, 0, len(params))
for k, _ := range params {
if k != "sign" {
keys = append(keys, k)
}
}
sort.Strings(keys)
var buf bytes.Buffer
for _, k := range keys {
if len(params.GetString(k)) > 0 {
buf.WriteString(k)
buf.WriteString(`=`)
buf.WriteString(params.GetString(k))
buf.WriteString(`&`)
}
}
buf.WriteString(`key=`)
buf.WriteString(c.ApiKey)
sum := md5.Sum(buf.Bytes())
str := hex.EncodeToString(sum[:])
return strings.ToUpper(str)
}