start refactoring

utils/util/util.go

@@ -0,0 +1,47 @@
+// Copyright 2017 fatedier, fatedier@gmail.com
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package util
+
+import (
+	"crypto/md5"
+	"crypto/rand"
+	"encoding/hex"
+	"fmt"
+)
+
+// RandId return a rand string used in frp.
+func RandId() (id string, err error) {
+	return RandIdWithLen(8)
+}
+
+// RandIdWithLen return a rand string with idLen length.
+func RandIdWithLen(idLen int) (id string, err error) {
+	b := make([]byte, idLen)
+	_, err = rand.Read(b)
+	if err != nil {
+		return
+	}
+
+	id = fmt.Sprintf("%x", b)
+	return
+}
+
+func GetAuthKey(token string, timestamp int64) (key string) {
+	token = token + fmt.Sprintf("%d", timestamp)
+	md5Ctx := md5.New()
+	md5Ctx.Write([]byte(token))
+	data := md5Ctx.Sum(nil)
+	return hex.EncodeToString(data)
+}