/
bootstraptoken.go
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/
bootstraptoken.go
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// Copyright (c) 2018 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 bootstraptoken
import (
"context"
"regexp"
"time"
"github.com/gardener/gardener/pkg/controllerutils"
"github.com/gardener/gardener/pkg/utils"
"github.com/gardener/gardener/pkg/utils/kubernetes"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
bootstraptokenapi "k8s.io/cluster-bootstrap/token/api"
bootstraptokenutil "k8s.io/cluster-bootstrap/token/util"
"sigs.k8s.io/controller-runtime/pkg/client"
)
// ComputeBootstrapToken computes and creates a new bootstrap token, and returns it.
func ComputeBootstrapToken(ctx context.Context, c client.Client, tokenID, description string, validity time.Duration) (secret *corev1.Secret, err error) {
var (
bootstrapTokenSecretKey string
)
secret = &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: bootstraptokenutil.BootstrapTokenSecretName(tokenID),
Namespace: metav1.NamespaceSystem,
},
}
if err = c.Get(ctx, kubernetes.Key(secret.Namespace, secret.Name), secret); client.IgnoreNotFound(err) != nil {
return nil, err
}
validBootstrapTokenSecret, _ := regexp.Compile(`[a-z0-9]{16}`)
if existingSecretToken, ok := secret.Data[bootstraptokenapi.BootstrapTokenSecretKey]; ok && validBootstrapTokenSecret.Match(existingSecretToken) {
bootstrapTokenSecretKey = string(existingSecretToken)
} else {
bootstrapTokenSecretKey, err = utils.GenerateRandomStringFromCharset(16, "0123456789abcdefghijklmnopqrstuvwxyz")
if err != nil {
return nil, err
}
}
data := map[string][]byte{
bootstraptokenapi.BootstrapTokenDescriptionKey: []byte(description),
bootstraptokenapi.BootstrapTokenIDKey: []byte(tokenID),
bootstraptokenapi.BootstrapTokenSecretKey: []byte(bootstrapTokenSecretKey),
bootstraptokenapi.BootstrapTokenExpirationKey: []byte(metav1.Now().Add(validity).Format(time.RFC3339)),
bootstraptokenapi.BootstrapTokenUsageAuthentication: []byte("true"),
bootstraptokenapi.BootstrapTokenUsageSigningKey: []byte("true"),
}
_, err2 := controllerutils.GetAndCreateOrMergePatch(ctx, c, secret, func() error {
secret.Type = bootstraptokenapi.SecretTypeBootstrapToken
secret.Data = data
return nil
})
return secret, err2
}
// FromSecretData returns the bootstrap token based on the secret data.
func FromSecretData(data map[string][]byte) string {
return bootstraptokenutil.TokenFromIDAndSecret(string(data[bootstraptokenapi.BootstrapTokenIDKey]), string(data[bootstraptokenapi.BootstrapTokenSecretKey]))
}