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k8s.go
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k8s.go
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// Copyright © 2018 Banzai Cloud
//
// 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 k8s
import (
"context"
"encoding/json"
"os"
"emperror.dev/errors"
v1 "k8s.io/api/core/v1"
k8serrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"github.com/banzaicloud/bank-vaults/pkg/kv"
)
// EnvK8SOwnerReference holds the environment variable name for passing in K8S owner refs
// TODO: remove this in the next release.
const EnvK8SOwnerReference = "K8S_OWNER_REFERENCE"
type k8sStorage struct {
client *kubernetes.Clientset
namespace string
secret string
labels map[string]string
ownerReference *metav1.OwnerReference
}
// New creates a new kv.Service backed by K8S Secrets
func New(namespace, secret string, labels map[string]string) (kv.Service, error) {
kubeconfig := os.Getenv(clientcmd.RecommendedConfigPathEnvVar)
var config *rest.Config
var err error
if kubeconfig != "" {
config, err = clientcmd.BuildConfigFromFlags("", kubeconfig)
} else {
config, err = rest.InClusterConfig()
}
if err != nil {
return nil, errors.Wrap(err, "error creating k8s config")
}
client, err := kubernetes.NewForConfig(config)
if err != nil {
return nil, errors.Wrap(err, "error creating k8s client")
}
var ownerReference *metav1.OwnerReference
ownerReferenceJSON := os.Getenv(EnvK8SOwnerReference)
if ownerReferenceJSON != "" {
ownerReference = &metav1.OwnerReference{}
err := json.Unmarshal([]byte(ownerReferenceJSON), ownerReference)
if err != nil {
return nil, errors.Wrap(err, "error unmarhsaling OwnerReference")
}
}
return &k8sStorage{
client: client,
namespace: namespace,
secret: secret,
labels: labels,
ownerReference: ownerReference,
}, nil
}
func (k *k8sStorage) Set(key string, val []byte) error {
secret, err := k.client.CoreV1().Secrets(k.namespace).Get(context.Background(), k.secret, metav1.GetOptions{})
if k8serrors.IsNotFound(err) {
secret := &v1.Secret{
ObjectMeta: metav1.ObjectMeta{
Namespace: k.namespace,
Name: k.secret,
Labels: k.labels,
},
Data: map[string][]byte{key: val},
}
if k.ownerReference != nil {
secret.ObjectMeta.SetOwnerReferences([]metav1.OwnerReference{*k.ownerReference})
}
_, err = k.client.CoreV1().Secrets(k.namespace).Create(context.Background(), secret, metav1.CreateOptions{})
} else if err == nil {
secret.Data[key] = val
_, err = k.client.CoreV1().Secrets(k.namespace).Update(context.Background(), secret, metav1.UpdateOptions{})
} else {
return errors.Wrapf(err, "error checking if '%s' secret exists", k.secret)
}
if err != nil {
return errors.Wrapf(err, "error writing secret key '%s' into secret '%s'", key, k.secret)
}
return nil
}
func (k *k8sStorage) Get(key string) ([]byte, error) {
secret, err := k.client.CoreV1().Secrets(k.namespace).Get(context.Background(), k.secret, metav1.GetOptions{})
if err != nil {
if k8serrors.IsNotFound(err) {
return nil, kv.NewNotFoundError("error getting secret for key '%s': %s", key, err.Error())
}
return nil, errors.Wrapf(err, "error getting secret for key '%s'", key)
}
val := secret.Data[key]
if val == nil {
return nil, kv.NewNotFoundError("key '%s' is not present in secret: %s", key, secret.GetName())
}
return val, nil
}