-
Notifications
You must be signed in to change notification settings - Fork 762
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Signed-off-by: Kuromesi <blackfacepan@163.com>
- Loading branch information
Showing
2 changed files
with
127 additions
and
1 deletion.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,122 @@ | ||
/* | ||
Copyright 2020 The Kruise Authors. | ||
Copyright 2018 The Kubernetes Authors. | ||
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 writer | ||
|
||
import ( | ||
"context" | ||
"errors" | ||
|
||
corev1 "k8s.io/api/core/v1" | ||
apierrors "k8s.io/apimachinery/pkg/api/errors" | ||
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
"k8s.io/apimachinery/pkg/types" | ||
clientset "k8s.io/client-go/kubernetes" | ||
|
||
"github.com/openkruise/kruise/pkg/webhook/util/generator" | ||
) | ||
|
||
const ( | ||
ExternalCertWriter = "external" | ||
ExternalCACert = "ca.crt" | ||
ExternalCAKey = "ca.key" | ||
ExternalServerCert = "tls.crt" | ||
ExternalServerKey = "tls.key" | ||
) | ||
|
||
// externalCertWriter provisions the certificate by reading and writing to the k8s secrets. | ||
type externalCertWriter struct { | ||
*ExternalCertWriterOptions | ||
|
||
// dnsName is the DNS name that the certificate is for. | ||
dnsName string | ||
} | ||
|
||
// externalCertWriterOptions is options for constructing a externalCertWriter. | ||
type ExternalCertWriterOptions struct { | ||
// client talks to a kubernetes cluster for creating the secret. | ||
Clientset clientset.Interface | ||
// secret points the secret that contains certificates that written by the CertWriter. | ||
Secret *types.NamespacedName | ||
} | ||
|
||
var _ CertWriter = &externalCertWriter{} | ||
|
||
func (ops *ExternalCertWriterOptions) validate() error { | ||
if ops.Clientset == nil { | ||
return errors.New("client must be set in externalCertWriterOptions") | ||
} | ||
if ops.Secret == nil { | ||
return errors.New("secret must be set in externalCertWriterOptions") | ||
} | ||
return nil | ||
} | ||
|
||
// NewexternalCertWriter constructs a CertWriter that persists the certificate in a k8s secret. | ||
func NewExternalCertWriter(ops ExternalCertWriterOptions) (CertWriter, error) { | ||
err := ops.validate() | ||
if err != nil { | ||
return nil, err | ||
} | ||
return &externalCertWriter{ExternalCertWriterOptions: &ops}, nil | ||
} | ||
|
||
// EnsureCert provisions certificates for a webhookClientConfig by writing the certificates to a k8s secret. | ||
func (s *externalCertWriter) EnsureCert(dnsName string) (*generator.Artifacts, bool, error) { | ||
// Create or refresh the certs based on clientConfig | ||
s.dnsName = dnsName | ||
certs, err := s.read() | ||
if err != nil { | ||
return nil, false, err | ||
} | ||
return certs, true, nil | ||
} | ||
|
||
var _ certReadWriter = &externalCertWriter{} | ||
|
||
func (s *externalCertWriter) write() (*generator.Artifacts, error) { | ||
return nil, nil | ||
} | ||
|
||
func (s *externalCertWriter) overwrite(resourceVersion string) (*generator.Artifacts, error) { | ||
return nil, nil | ||
} | ||
|
||
func (s *externalCertWriter) read() (*generator.Artifacts, error) { | ||
secret, err := s.Clientset.CoreV1().Secrets(s.Secret.Namespace).Get(context.TODO(), s.Secret.Name, metav1.GetOptions{}) | ||
if apierrors.IsNotFound(err) { | ||
return nil, notFoundError{err} | ||
} | ||
if err != nil { | ||
return nil, err | ||
} | ||
certs := externalSecretToCerts(secret) | ||
return certs, nil | ||
} | ||
|
||
func externalSecretToCerts(secret *corev1.Secret) *generator.Artifacts { | ||
ret := &generator.Artifacts{ | ||
ResourceVersion: secret.ResourceVersion, | ||
} | ||
if secret.Data != nil { | ||
ret.CACert = secret.Data[ExternalCACert] | ||
ret.CAKey = secret.Data[ExternalCAKey] | ||
ret.Cert = secret.Data[ExternalServerCert] | ||
ret.Key = secret.Data[ExternalServerKey] | ||
} | ||
return ret | ||
} |