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// Copyright 2018 Google LLC 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
//
// 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 k8schain
import (
"context"
"io"
ecr "github.com/awslabs/amazon-ecr-credential-helper/ecr-login"
"github.com/chrismellard/docker-credential-acr-env/pkg/credhelper"
"github.com/google/go-containerregistry/pkg/authn"
kauth "github.com/google/go-containerregistry/pkg/authn/kubernetes"
"github.com/google/go-containerregistry/pkg/v1/google"
corev1 "k8s.io/api/core/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
)
var (
amazonKeychain authn.Keychain = authn.NewKeychainFromHelper(ecr.NewECRHelper(ecr.WithLogger(io.Discard)))
azureKeychain authn.Keychain = authn.NewKeychainFromHelper(credhelper.NewACRCredentialsHelper())
)
// Options holds configuration data for guiding credential resolution.
type Options = kauth.Options
// New returns a new authn.Keychain suitable for resolving image references as
// scoped by the provided Options. It speaks to Kubernetes through the provided
// client interface.
func New(ctx context.Context, client kubernetes.Interface, opt Options) (authn.Keychain, error) {
k8s, err := kauth.New(ctx, client, kauth.Options(opt))
if err != nil {
return nil, err
}
return authn.NewMultiKeychain(
k8s,
authn.DefaultKeychain,
google.Keychain,
amazonKeychain,
azureKeychain,
), nil
}
// NewInCluster returns a new authn.Keychain suitable for resolving image references as
// scoped by the provided Options, constructing a kubernetes.Interface based on in-cluster
// authentication.
func NewInCluster(ctx context.Context, opt Options) (authn.Keychain, error) {
clusterConfig, err := rest.InClusterConfig()
if err != nil {
return nil, err
}
client, err := kubernetes.NewForConfig(clusterConfig)
if err != nil {
return nil, err
}
return New(ctx, client, opt)
}
// NewNoClient returns a new authn.Keychain that supports the portions of the K8s keychain
// that don't read ImagePullSecrets. This limits it to roughly the Node-identity-based
// authentication schemes in Kubernetes pkg/credentialprovider. This version of the
// k8schain drops the requirement that we run as a K8s serviceaccount with access to all
// of the on-cluster secrets. This drop in fidelity also diminishes its value as a stand-in
// for Kubernetes authentication, but this actually targets a different use-case. What
// remains is an interesting sweet spot: this variant can serve as a credential provider
// for all of the major public clouds, but in library form (vs. an executable you exec).
func NewNoClient(ctx context.Context) (authn.Keychain, error) {
return authn.NewMultiKeychain(
authn.DefaultKeychain,
google.Keychain,
amazonKeychain,
azureKeychain,
), nil
}
// NewFromPullSecrets returns a new authn.Keychain suitable for resolving image references as
// scoped by the pull secrets.
func NewFromPullSecrets(ctx context.Context, pullSecrets []corev1.Secret) (authn.Keychain, error) {
k8s, err := kauth.NewFromPullSecrets(ctx, pullSecrets)
if err != nil {
return nil, err
}
return authn.NewMultiKeychain(
k8s,
authn.DefaultKeychain,
google.Keychain,
amazonKeychain,
azureKeychain,
), nil
}
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