/
keychain.go
109 lines (93 loc) · 2.48 KB
/
keychain.go
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/*
* Copyright (c) 2020. Ant Group. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*/
package auth
import (
"encoding/base64"
"errors"
"fmt"
"strings"
"github.com/google/go-containerregistry/pkg/authn"
"github.com/dragonflyoss/image-service/contrib/nydus-snapshotter/pkg/label"
)
const (
sep = ":"
)
var (
emptyPassKeyChain = PassKeyChain{}
)
// PassKeyChain is user/password based key chain
type PassKeyChain struct {
Username string
Password string
}
func FromBase64(str string) (PassKeyChain, error) {
decoded, err := base64.StdEncoding.DecodeString(str)
if err != nil {
return emptyPassKeyChain, nil
}
pair := strings.Split(string(decoded), sep)
if len(pair) != 2 {
return emptyPassKeyChain, errors.New("invalid registry auth token")
}
return PassKeyChain{
Username: pair[0],
Password: pair[1],
}, nil
}
func (kc PassKeyChain) ToBase64() string {
if kc.Username == "" && kc.Password == "" {
return ""
}
return base64.StdEncoding.EncodeToString([]byte(fmt.Sprintf("%s:%s", kc.Username, kc.Password)))
}
// TokenBase check if PassKeyChain is token based, when username is empty and password is not empty
// then password is registry token
func (kc PassKeyChain) TokenBase() bool {
return kc.Username == "" && kc.Password != ""
}
// FromLabels finds image pull username and secret from snapshot labels.
// Returned `nil` means no validated username and secrect are passed, it should
// not override input nydusd configuration.
func FromLabels(labels map[string]string) *PassKeyChain {
u, found := labels[label.ImagePullUsername]
if !found || u == "" {
return nil
}
p, found := labels[label.ImagePullSecret]
if !found || p == "" {
return nil
}
return &PassKeyChain{
Username: u,
Password: p,
}
}
// GetRegistryKeyChain get image pull kaychain from (ordered):
// 1. username and secrets labels
// 2. docker config
func GetRegistryKeyChain(host string, labels map[string]string) *PassKeyChain {
kc := FromLabels(labels)
if kc != nil {
return kc
}
return FromDockerConfig(host)
}
func (kc PassKeyChain) Resolve(target authn.Resource) (authn.Authenticator, error) {
return authn.FromConfig(kc.toAuthConfig()), nil
}
// toAuthConfig convert PassKeyChain to authn.AuthConfig when kc is token based,
// RegistryToken is preferred to
func (kc PassKeyChain) toAuthConfig() authn.AuthConfig {
if kc.TokenBase() {
return authn.AuthConfig{
RegistryToken: kc.Password,
}
}
return authn.AuthConfig{
Username: kc.Username,
Password: kc.Password,
}
}