dex-ca.go

/*
Copyright 2020 The Kubermatic Kubernetes Platform contributors.

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 certificates

import (
	"crypto/x509"
	"encoding/pem"
	"fmt"

	"github.com/kubermatic/kubermatic/api/pkg/resources/reconciling"

	corev1 "k8s.io/api/core/v1"
)

type dexCAGetter func() ([]*x509.Certificate, error)

// GetDexCACreator returns a function to create a secret containing a CA bundle with the specified name
func GetDexCACreator(dataCAKey string, getCA dexCAGetter) reconciling.SecretCreator {
	return func(se *corev1.Secret) (*corev1.Secret, error) {
		ca, err := getCA()
		if err != nil {
			return nil, fmt.Errorf("failed to get dex public keys: %v", err)
		}

		if se.Data == nil {
			se.Data = map[string][]byte{}
		}

		if _, exists := se.Data[dataCAKey]; exists {
			return se, nil
		}

		var cert []byte
		for _, certRaw := range ca {
			block := pem.Block{
				Type:  "CERTIFICATE",
				Bytes: certRaw.Raw,
			}
			cert = append(cert, pem.EncodeToMemory(&block)...)
		}

		se.Data[dataCAKey] = cert
		return se, nil
	}
}