Merge pull request #2 from RycCheen/master

fix bug about timestamp, desc:invalid timestamp, more: [https://ding-…

security/security.go

@@ -20,8 +20,6 @@ var dingTalkURL url.URL = url.URL{
 	Path:   "robot/send",
 }
 
-var timestamp = strconv.FormatInt(time.Now().Unix()*1000, 10)
-
 // GetDingTalkURL get DingTalk URL with accessToken & secret
 // If no signature is set, the secret is set to ""
 // 如果没有加签，secret 设置为 "" 即可
@@ -35,6 +33,7 @@ func GetDingTalkURL(accessToken string, secret string) (string, error) {
 		return dtu.String(), nil
 	}
 
+	timestamp := strconv.FormatInt(time.Now().Unix()*1000, 10)
 	sign, err := sign(timestamp, secret)
 	if err != nil {
 		dtu.RawQuery = value.Encode()