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token.go
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token.go
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/*
* Tencent is pleased to support the open source community by making TKEStack
* available.
*
* Copyright (C) 2012-2019 Tencent. All Rights Reserved.
*
* 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
*
* https://opensource.org/licenses/Apache-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 OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*/
package auth
import (
"crypto"
"encoding/base64"
"fmt"
"github.com/docker/distribution/registry/auth/token"
"github.com/docker/libtrust"
"math/rand"
"strings"
"time"
)
const (
Service = "tke"
Issuer = "tke-registry-token-issuer"
)
// Token represents the json returned by registry token service
type Token struct {
Token string `json:"token"`
AccessToken string `json:"access_token"`
ExpiresIn int `json:"expires_in"`
IssuedAt string `json:"issued_at"`
}
// makeToken makes a valid jwt token based on params.
func makeToken(username string, access []*token.ResourceActions, expiredHours int64, privateKey libtrust.PrivateKey) (*Token, error) {
tk, expiresIn, issuedAt, err := makeTokenCore(Issuer, username, Service, expiredHours, access, privateKey)
if err != nil {
return nil, err
}
rs := fmt.Sprintf("%s.%s", tk.Raw, base64UrlEncode(tk.Signature))
return &Token{
Token: rs,
ExpiresIn: expiresIn,
IssuedAt: issuedAt.Format(time.RFC3339),
}, nil
}
// make token core
func makeTokenCore(issuer, subject, audience string, expirationHour int64, access []*token.ResourceActions, signingKey libtrust.PrivateKey) (t *token.Token, expiresIn int, issuedAt *time.Time, err error) {
joseHeader := &token.Header{
Type: "JWT",
SigningAlg: "RS256",
KeyID: signingKey.KeyID(),
}
jwtID, err := randString(16)
if err != nil {
return nil, 0, nil, fmt.Errorf("failed to generate jwt id: %s", err)
}
now := time.Now().UTC()
issuedAt = &now
claimSet := &token.ClaimSet{
Issuer: issuer,
Subject: subject,
Audience: audience,
Expiration: now.Add(time.Duration(expirationHour) * time.Hour).Unix(),
NotBefore: now.Unix(),
IssuedAt: now.Unix(),
JWTID: jwtID,
Access: access,
}
var joseHeaderBytes, claimSetBytes []byte
if joseHeaderBytes, err = json.Marshal(joseHeader); err != nil {
return nil, 0, nil, fmt.Errorf("unable to marshal jose header: %s", err)
}
if claimSetBytes, err = json.Marshal(claimSet); err != nil {
return nil, 0, nil, fmt.Errorf("unable to marshal claim set: %s", err)
}
encodedJoseHeader := base64UrlEncode(joseHeaderBytes)
encodedClaimSet := base64UrlEncode(claimSetBytes)
payload := fmt.Sprintf("%s.%s", encodedJoseHeader, encodedClaimSet)
var signatureBytes []byte
if signatureBytes, _, err = signingKey.Sign(strings.NewReader(payload), crypto.SHA256); err != nil {
return nil, 0, nil, fmt.Errorf("unable to sign jwt payload: %s", err)
}
signature := base64UrlEncode(signatureBytes)
tokenString := fmt.Sprintf("%s.%s", payload, signature)
t, err = token.NewToken(tokenString)
return
}
func randString(length int) (string, error) {
const alphanum = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
rb := make([]byte, length)
_, err := rand.Read(rb)
if err != nil {
return "", err
}
for i, b := range rb {
rb[i] = alphanum[int(b)%len(alphanum)]
}
return string(rb), nil
}
func base64UrlEncode(b []byte) string {
return strings.TrimRight(base64.URLEncoding.EncodeToString(b), "=")
}