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keychain.go
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keychain.go
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// Copyright 2021 Google LLC
//
// 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 keychain creates credentials for authenticating to container image registries.
package keychain
import (
"context"
"fmt"
"io/ioutil"
"github.com/awslabs/amazon-ecr-credential-helper/ecr-login"
"github.com/chrismellard/docker-credential-acr-env/pkg/credhelper"
"github.com/go-logr/logr"
"github.com/google/go-containerregistry/pkg/authn"
"github.com/google/go-containerregistry/pkg/authn/github"
"github.com/google/go-containerregistry/pkg/authn/k8schain"
"github.com/google/go-containerregistry/pkg/v1/google"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"sigs.k8s.io/kustomize/kyaml/yaml"
)
var (
amazonKeychain = authn.NewKeychainFromHelper(ecr.NewECRHelper(ecr.WithLogger(ioutil.Discard)))
azureKeychain = authn.NewKeychainFromHelper(credhelper.NewACRCredentialsHelper())
createClientFn = createClient // override for testing
)
// Create a multi keychain based in input arguments
func Create(ctx context.Context, log logr.Logger, config *rest.Config, n *yaml.RNode) (authn.Keychain, error) {
if config == nil {
log.V(1).Info("creating offline keychain")
return authn.NewMultiKeychain(
google.Keychain,
authn.DefaultKeychain,
github.Keychain,
amazonKeychain,
azureKeychain,
), nil
}
client, err := createClientFn(config)
if err != nil {
return nil, fmt.Errorf("could not create Kubernetes Clientset: %w", err)
}
kkc, err := createK8schain(ctx, log, client, n)
if err != nil {
return nil, fmt.Errorf("could not create k8schain: %w", err)
}
log.V(1).Info("creating k8s keychain")
return authn.NewMultiKeychain(kkc, authn.DefaultKeychain), nil
}
func createClient(config *rest.Config) (kubernetes.Interface, error) {
return kubernetes.NewForConfig(config)
}
func createK8schain(ctx context.Context, log logr.Logger, client kubernetes.Interface, n *yaml.RNode) (authn.Keychain, error) {
var namespace string
namespaceNode, err := n.Pipe(yaml.Lookup("metadata", "namespace"))
if err == nil {
namespace = yaml.GetValue(namespaceNode)
}
var serviceAccountName string
podServiceAccountNameNode, err := n.Pipe(yaml.Lookup("spec", "serviceAccountName"))
if err == nil {
serviceAccountName = yaml.GetValue(podServiceAccountNameNode)
}
if serviceAccountName == "" {
podTemplateServiceAccountNameNode, err := n.Pipe(yaml.Lookup("spec", "template", "spec", "serviceAccountName"))
if err == nil {
serviceAccountName = yaml.GetValue(podTemplateServiceAccountNameNode)
}
if serviceAccountName == "" {
cronJobServiceAccountNameNode, err := n.Pipe(yaml.Lookup("spec", "jobTemplate", "spec", "template", "spec", "serviceAccountName"))
if err == nil {
serviceAccountName = yaml.GetValue(cronJobServiceAccountNameNode)
}
}
}
var imagePullSecrets []string
podImagePullSecretsNode, err := n.Pipe(yaml.Lookup("spec", "imagePullSecrets"))
if err == nil {
imagePullSecrets, _ = podImagePullSecretsNode.ElementValues("name")
}
if len(imagePullSecrets) == 0 {
podTemplateImagePullSecretsNode, err := n.Pipe(yaml.Lookup("spec", "template", "spec", "imagePullSecrets"))
if err == nil {
imagePullSecrets, _ = podTemplateImagePullSecretsNode.ElementValues("name")
}
if len(imagePullSecrets) == 0 {
cronJobImagePullSecretsNode, err := n.Pipe(yaml.Lookup("spec", "jobTemplate", "spec", "template", "spec", "imagePullSecrets"))
if err == nil {
imagePullSecrets, _ = cronJobImagePullSecretsNode.ElementValues("name")
}
}
}
log.V(1).Info("creating k8schain",
"namespace", namespace,
"serviceAccountName", serviceAccountName,
"imagePullSecrets", imagePullSecrets)
return k8schain.New(ctx, client, k8schain.Options{
Namespace: namespace, // defaults to "default" if empty
ServiceAccountName: serviceAccountName, // defaults to "default" if empty
ImagePullSecrets: imagePullSecrets,
})
}