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httpsigs.go
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httpsigs.go
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// Copyright 2022 The kubegems.io Authors
//
// 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 httpsigs
import (
"crypto/md5"
"fmt"
"net/http"
"strconv"
"strings"
"time"
)
var signer *Signer
const (
token = "fedf4ca02b9235a616ccb11d9540bb42"
headerToken = "sign-token"
headerTime = "sign-time"
)
type Signer struct {
Token string
Duration int64
WhiteList []string
}
func init() {
signer = &Signer{
Token: token,
Duration: 10,
}
}
func GetSigner() *Signer {
return signer
}
func (s *Signer) AddWhiteList(path string) {
if s.IsWhiteList(path) {
return
}
s.WhiteList = append(s.WhiteList, path)
}
func (s *Signer) IsWhiteList(path string) bool {
for idx := range s.WhiteList {
if s.WhiteList[idx] == path {
return true
}
}
return false
}
func (s *Signer) Sign(req *http.Request, prefix string) {
path := strings.TrimPrefix(req.URL.Path, prefix)
timeStr := strconv.FormatInt(time.Now().Unix(), 10)
toSignStr := path + timeStr + s.Token
sign := fmt.Sprintf("%x", md5.Sum([]byte(toSignStr)))
req.Header.Set(headerToken, sign)
req.Header.Set(headerTime, timeStr)
}
func (s *Signer) Validate(req *http.Request) error {
if s.IsWhiteList(req.URL.Path) {
return nil
}
timeStr := req.Header.Get(headerTime)
token := req.Header.Get(headerToken)
path := req.URL.Path
timestamp, err := strconv.ParseInt(timeStr, 10, 64)
if err != nil {
return err
}
n := time.Now()
after := n.Add(time.Second * time.Duration(s.Duration)).Unix()
before := n.Add(time.Second * (-1 * time.Duration(s.Duration))).Unix()
if timestamp > after || timestamp < before {
return fmt.Errorf("httpsigs time out, origin: %s, now: %v", timeStr, n)
}
toSignStr := path + timeStr + s.Token
signOut := fmt.Sprintf("%x", md5.Sum([]byte(toSignStr)))
if signOut != token {
return fmt.Errorf("invalid http signature, path: %s, tosign: %s, sign: %s", path, toSignStr, signOut)
}
return nil
}