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common.go
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common.go
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package wxpay
import (
"bytes"
"crypto/md5"
"crypto/tls"
"errors"
"fmt"
"io/ioutil"
"math/rand"
"net/http"
"reflect"
"sort"
"strings"
"time"
)
// 发送Xml请求
func sendXmlRequest(method, path string, xmlString string, tlsConfig *tls.Config, timeout time.Duration) (body []byte, err error) {
req, err := http.NewRequest(method, path, bytes.NewBufferString(xmlString))
if err != nil {
return
}
client := http.Client{}
if timeout > 0 {
client.Timeout = timeout * time.Second
}
if tlsConfig != nil {
client.Transport = &http.Transport{TLSClientConfig: tlsConfig}
}
resp, err := client.Do(req)
if err != nil {
err = errors.New("request fail")
return
}
defer resp.Body.Close()
body, err = ioutil.ReadAll(resp.Body)
return
}
// map转xml
func map2Xml(params map[string]string) string {
xmlString := "<xml>"
for k, v := range params {
xmlString += fmt.Sprintf("<%s>%s</%s>", k, v, k)
}
xmlString += "</xml>"
return xmlString
}
// xml转map
func xml2Map(in interface{}) (map[string]string, error) {
xmlMap := make(map[string]string)
v := reflect.ValueOf(in)
if v.Kind() == reflect.Ptr {
v = v.Elem()
}
if v.Kind() != reflect.Struct {
return nil, fmt.Errorf("xml2Map only accepts structs; got %T", v)
}
typ := v.Type()
for i := 0; i < v.NumField(); i++ {
fi := typ.Field(i)
tagv := fi.Tag.Get("xml")
if strings.Contains(tagv, ",") {
tagvs := strings.Split(tagv, ",")
switch tagvs[1] {
case "innerXml":
innerXmlMap, err := xml2Map(v.Field(i).Interface())
if err != nil {
return nil, err
}
for k, v := range innerXmlMap {
if _, ok := xmlMap[k]; !ok {
xmlMap[k] = v
}
}
}
} else if tagv != "" && tagv != "xml" {
xmlMap[tagv] = v.Field(i).String()
}
}
return xmlMap, nil
}
// 生成sign
func makeSign(params map[string]string, key string) string {
var keys []string
var sorted []string
for k, v := range params {
if k != "sign" && v != "" {
keys = append(keys, k)
}
}
sort.Strings(keys)
for _, k := range keys {
sorted = append(sorted, fmt.Sprintf("%s=%s", k, params[k]))
}
str := strings.Join(sorted, "&")
str += "&key=" + key
return fmt.Sprintf("%X", md5.Sum([]byte(str)))
}
// 产生随机字符串
func getNonceStr(n int) string {
chars := []byte("abcdefghijklmnopqrstuvwxyz0123456789")
value := []byte{}
m := len(chars)
r := rand.New(rand.NewSource(time.Now().UnixNano()))
for i := 0; i < n; i++ {
value = append(value, chars[r.Intn(m)])
}
return string(value)
}