122 lines
3.6 KiB
Go
122 lines
3.6 KiB
Go
// Copyright 2020-2021 the Pinniped contributors. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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package issuerconfig
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import (
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"encoding/base64"
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"fmt"
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k8serrors "k8s.io/apimachinery/pkg/api/errors"
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corev1informers "k8s.io/client-go/informers/core/v1"
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"k8s.io/client-go/tools/clientcmd"
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"k8s.io/klog/v2"
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configv1alpha1 "go.pinniped.dev/generated/1.20/apis/concierge/config/v1alpha1"
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pinnipedclientset "go.pinniped.dev/generated/1.20/client/concierge/clientset/versioned"
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pinnipedcontroller "go.pinniped.dev/internal/controller"
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"go.pinniped.dev/internal/controllerlib"
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"go.pinniped.dev/internal/plog"
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)
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const (
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ClusterInfoNamespace = "kube-public"
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clusterInfoName = "cluster-info"
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clusterInfoConfigMapKey = "kubeconfig"
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)
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type kubeConigInfoPublisherController struct {
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credentialIssuerResourceName string
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credentialIssuerLabels map[string]string
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serverOverride *string
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pinnipedClient pinnipedclientset.Interface
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configMapInformer corev1informers.ConfigMapInformer
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}
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// NewKubeConfigInfoPublisherController returns a controller that syncs the
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// configv1alpha1.CredentialIssuer.Status.KubeConfigInfo field with the cluster-info ConfigMap
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// in the kube-public namespace.
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func NewKubeConfigInfoPublisherController(
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credentialIssuerResourceName string,
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credentialIssuerLabels map[string]string,
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serverOverride *string,
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pinnipedClient pinnipedclientset.Interface,
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configMapInformer corev1informers.ConfigMapInformer,
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withInformer pinnipedcontroller.WithInformerOptionFunc,
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) controllerlib.Controller {
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return controllerlib.New(
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controllerlib.Config{
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Name: "publisher-controller",
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Syncer: &kubeConigInfoPublisherController{
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credentialIssuerResourceName: credentialIssuerResourceName,
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credentialIssuerLabels: credentialIssuerLabels,
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serverOverride: serverOverride,
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pinnipedClient: pinnipedClient,
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configMapInformer: configMapInformer,
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},
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},
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withInformer(
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configMapInformer,
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pinnipedcontroller.NameAndNamespaceExactMatchFilterFactory(clusterInfoName, ClusterInfoNamespace),
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controllerlib.InformerOption{},
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),
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)
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}
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func (c *kubeConigInfoPublisherController) Sync(ctx controllerlib.Context) error {
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configMap, err := c.configMapInformer.
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Lister().
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ConfigMaps(ClusterInfoNamespace).
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Get(clusterInfoName)
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notFound := k8serrors.IsNotFound(err)
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if err != nil && !notFound {
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return fmt.Errorf("failed to get %s configmap: %w", clusterInfoName, err)
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}
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if notFound {
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plog.Debug(
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"could not find config map",
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"configmap",
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klog.KRef(ClusterInfoNamespace, clusterInfoName),
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)
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return nil
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}
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kubeConfig, kubeConfigPresent := configMap.Data[clusterInfoConfigMapKey]
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if !kubeConfigPresent {
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plog.Debug("could not find kubeconfig configmap key")
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return nil
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}
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config, err := clientcmd.Load([]byte(kubeConfig))
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if err != nil {
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plog.Debug("could not load kubeconfig configmap key")
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return nil
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}
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var certificateAuthorityData, server string
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for _, v := range config.Clusters {
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certificateAuthorityData = base64.StdEncoding.EncodeToString(v.CertificateAuthorityData)
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server = v.Server
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break
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}
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if c.serverOverride != nil {
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server = *c.serverOverride
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}
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updateServerAndCAFunc := func(c *configv1alpha1.CredentialIssuerStatus) {
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c.KubeConfigInfo = &configv1alpha1.CredentialIssuerKubeConfigInfo{
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Server: server,
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CertificateAuthorityData: certificateAuthorityData,
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}
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}
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return CreateOrUpdateCredentialIssuerStatus(
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ctx.Context,
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c.credentialIssuerResourceName,
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c.credentialIssuerLabels,
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c.pinnipedClient,
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updateServerAndCAFunc,
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)
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}
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