mirror of https://github.com/fatedier/frp
147 lines
3.6 KiB
Go
147 lines
3.6 KiB
Go
// Copyright 2017 fatedier, fatedier@gmail.com
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package util
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import (
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"crypto/md5"
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"crypto/rand"
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"crypto/subtle"
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"encoding/hex"
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"fmt"
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mathrand "math/rand"
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"net"
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"strconv"
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"strings"
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"time"
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)
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// RandID return a rand string used in frp.
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func RandID() (id string, err error) {
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return RandIDWithLen(16)
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}
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// RandIDWithLen return a rand string with idLen length.
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func RandIDWithLen(idLen int) (id string, err error) {
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if idLen <= 0 {
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return "", nil
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}
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b := make([]byte, idLen/2+1)
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_, err = rand.Read(b)
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if err != nil {
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return
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}
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id = fmt.Sprintf("%x", b)
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return id[:idLen], nil
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}
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// RandIDWithRandLen return a rand string with length between [start, end).
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func RandIDWithRandLen(start, end int) (id string, err error) {
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if start >= end {
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err = fmt.Errorf("start should be less than end")
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return
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}
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idLen := mathrand.Intn(end-start) + start
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return RandIDWithLen(idLen)
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}
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func GetAuthKey(token string, timestamp int64) (key string) {
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md5Ctx := md5.New()
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md5Ctx.Write([]byte(token))
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md5Ctx.Write([]byte(strconv.FormatInt(timestamp, 10)))
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data := md5Ctx.Sum(nil)
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return hex.EncodeToString(data)
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}
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func CanonicalAddr(host string, port int) (addr string) {
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if port == 80 || port == 443 {
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addr = host
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} else {
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addr = net.JoinHostPort(host, strconv.Itoa(port))
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}
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return
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}
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func ParseRangeNumbers(rangeStr string) (numbers []int64, err error) {
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rangeStr = strings.TrimSpace(rangeStr)
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numbers = make([]int64, 0)
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// e.g. 1000-2000,2001,2002,3000-4000
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numRanges := strings.Split(rangeStr, ",")
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for _, numRangeStr := range numRanges {
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// 1000-2000 or 2001
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numArray := strings.Split(numRangeStr, "-")
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// length: only 1 or 2 is correct
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rangeType := len(numArray)
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switch rangeType {
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case 1:
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// single number
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singleNum, errRet := strconv.ParseInt(strings.TrimSpace(numArray[0]), 10, 64)
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if errRet != nil {
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err = fmt.Errorf("range number is invalid, %v", errRet)
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return
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}
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numbers = append(numbers, singleNum)
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case 2:
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// range numbers
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min, errRet := strconv.ParseInt(strings.TrimSpace(numArray[0]), 10, 64)
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if errRet != nil {
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err = fmt.Errorf("range number is invalid, %v", errRet)
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return
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}
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max, errRet := strconv.ParseInt(strings.TrimSpace(numArray[1]), 10, 64)
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if errRet != nil {
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err = fmt.Errorf("range number is invalid, %v", errRet)
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return
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}
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if max < min {
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err = fmt.Errorf("range number is invalid")
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return
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}
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for i := min; i <= max; i++ {
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numbers = append(numbers, i)
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}
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default:
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err = fmt.Errorf("range number is invalid")
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return
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}
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}
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return
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}
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func GenerateResponseErrorString(summary string, err error, detailed bool) string {
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if detailed {
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return err.Error()
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}
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return summary
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}
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func RandomSleep(duration time.Duration, minRatio, maxRatio float64) time.Duration {
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min := int64(minRatio * 1000.0)
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max := int64(maxRatio * 1000.0)
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var n int64
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if max <= min {
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n = min
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} else {
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n = mathrand.Int63n(max-min) + min
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}
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d := duration * time.Duration(n) / time.Duration(1000)
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time.Sleep(d)
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return d
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}
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func ConstantTimeEqString(a, b string) bool {
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return subtle.ConstantTimeCompare([]byte(a), []byte(b)) == 1
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}
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