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kubeconfig_resource.go
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kubeconfig_resource.go
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// Copyright 2022 Clastix Labs
// SPDX-License-Identifier: Apache-2.0
package konnectivity
import (
"context"
"fmt"
corev1 "k8s.io/api/core/v1"
k8serrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
k8stypes "k8s.io/apimachinery/pkg/types"
clientcmdapiv1 "k8s.io/client-go/tools/clientcmd/api/v1"
kubeadmconstants "k8s.io/kubernetes/cmd/kubeadm/app/constants"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
"sigs.k8s.io/controller-runtime/pkg/log"
kamajiv1alpha1 "github.com/clastix/kamaji/api/v1alpha1"
"github.com/clastix/kamaji/internal/constants"
"github.com/clastix/kamaji/internal/utilities"
)
type KubeconfigResource struct {
resource *corev1.Secret
Client client.Client
}
func (r *KubeconfigResource) ShouldStatusBeUpdated(_ context.Context, tenantControlPlane *kamajiv1alpha1.TenantControlPlane) bool {
return tenantControlPlane.Status.Addons.Konnectivity.Kubeconfig.Checksum != utilities.GetObjectChecksum(r.resource)
}
func (r *KubeconfigResource) ShouldCleanup(tenantControlPlane *kamajiv1alpha1.TenantControlPlane) bool {
return tenantControlPlane.Spec.Addons.Konnectivity == nil
}
func (r *KubeconfigResource) CleanUp(ctx context.Context, _ *kamajiv1alpha1.TenantControlPlane) (bool, error) {
logger := log.FromContext(ctx, "resource", r.GetName())
if err := r.Client.Delete(ctx, r.resource); err != nil {
if !k8serrors.IsNotFound(err) {
logger.Error(err, "cannot delete the requested resourece")
return false, err
}
return false, nil
}
return true, nil
}
func (r *KubeconfigResource) Define(_ context.Context, tenantControlPlane *kamajiv1alpha1.TenantControlPlane) error {
r.resource = &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: utilities.AddTenantPrefix(r.GetName(), tenantControlPlane),
Namespace: tenantControlPlane.GetNamespace(),
},
}
return nil
}
func (r *KubeconfigResource) CreateOrUpdate(ctx context.Context, tenantControlPlane *kamajiv1alpha1.TenantControlPlane) (controllerutil.OperationResult, error) {
return controllerutil.CreateOrUpdate(ctx, r.Client, r.resource, r.mutate(ctx, tenantControlPlane))
}
func (r *KubeconfigResource) GetName() string {
return "konnectivity-kubeconfig"
}
func (r *KubeconfigResource) UpdateTenantControlPlaneStatus(_ context.Context, tenantControlPlane *kamajiv1alpha1.TenantControlPlane) error {
if tenantControlPlane.Spec.Addons.Konnectivity != nil {
tenantControlPlane.Status.Addons.Konnectivity.Kubeconfig.LastUpdate = metav1.Now()
tenantControlPlane.Status.Addons.Konnectivity.Kubeconfig.SecretName = r.resource.GetName()
tenantControlPlane.Status.Addons.Konnectivity.Kubeconfig.Checksum = utilities.GetObjectChecksum(r.resource)
return nil
}
tenantControlPlane.Status.Addons.Konnectivity.Kubeconfig = kamajiv1alpha1.KubeconfigStatus{}
return nil
}
func (r *KubeconfigResource) mutate(ctx context.Context, tenantControlPlane *kamajiv1alpha1.TenantControlPlane) controllerutil.MutateFn {
return func() error {
logger := log.FromContext(ctx, "resource", r.GetName())
r.resource.SetLabels(utilities.MergeMaps(
utilities.KamajiLabels(tenantControlPlane.GetName(), r.GetName()),
map[string]string{
constants.ControllerLabelResource: "kubeconfig",
},
))
if err := ctrl.SetControllerReference(tenantControlPlane, r.resource, r.Client.Scheme()); err != nil {
logger.Error(err, "cannot set controller reference for kubeconfig", "resource", r.GetName())
return err
}
if checksum := tenantControlPlane.Status.Addons.Konnectivity.Certificate.Checksum; len(checksum) > 0 && checksum == utilities.GetObjectChecksum(r.resource) {
return nil
}
caNamespacedName := k8stypes.NamespacedName{Namespace: tenantControlPlane.GetNamespace(), Name: tenantControlPlane.Status.Certificates.CA.SecretName}
secretCA := &corev1.Secret{}
if err := r.Client.Get(ctx, caNamespacedName, secretCA); err != nil {
logger.Error(err, "cannot retrieve the CA secret")
return err
}
certificateNamespacedName := k8stypes.NamespacedName{Namespace: tenantControlPlane.GetNamespace(), Name: tenantControlPlane.Status.Addons.Konnectivity.Certificate.SecretName}
secretCertificate := &corev1.Secret{}
if err := r.Client.Get(ctx, certificateNamespacedName, secretCertificate); err != nil {
logger.Error(err, "cannot retrieve the Konnectivity Certificate secret")
return err
}
userName := CertCommonName
clusterName := defaultClusterName
contextName := fmt.Sprintf("%s@%s", userName, clusterName)
kubeconfig := &clientcmdapiv1.Config{
Kind: "Config",
APIVersion: kubeconfigAPIVersion,
AuthInfos: []clientcmdapiv1.NamedAuthInfo{
{
Name: userName,
AuthInfo: clientcmdapiv1.AuthInfo{
ClientKeyData: secretCertificate.Data[corev1.TLSPrivateKeyKey],
ClientCertificateData: secretCertificate.Data[corev1.TLSCertKey],
},
},
},
Clusters: []clientcmdapiv1.NamedCluster{
{
Name: clusterName,
Cluster: clientcmdapiv1.Cluster{
Server: fmt.Sprintf("https://%s:%d", "localhost", tenantControlPlane.Spec.NetworkProfile.Port),
CertificateAuthorityData: secretCA.Data[kubeadmconstants.CACertName],
},
},
},
Contexts: []clientcmdapiv1.NamedContext{
{
Name: contextName,
Context: clientcmdapiv1.Context{
Cluster: clusterName,
AuthInfo: userName,
},
},
},
CurrentContext: contextName,
}
kubeconfigBytes, err := utilities.EncodeToYaml(kubeconfig)
if err != nil {
logger.Error(err, "cannot encode to YAML the kubeconfig")
return err
}
r.resource.Data = map[string][]byte{
konnectivityKubeconfigFileName: kubeconfigBytes,
}
utilities.SetObjectChecksum(r.resource, r.resource.Data)
return nil
}
}