portainer/api/kubernetes/cli/namespace.go

package cli

import (
	"context"
	"strconv"

	"github.com/pkg/errors"
	v1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)

const (
	systemNamespaceLabel = "io.portainer.kubernetes.namespace.system"
)

func defaultSystemNamespaces() map[string]struct{} {
	return map[string]struct{}{
		"kube-system":     {},
		"kube-public":     {},
		"kube-node-lease": {},
		"portainer":       {},
	}
}

func isSystemNamespace(namespace v1.Namespace) bool {
	systemLabelValue, hasSystemLabel := namespace.Labels[systemNamespaceLabel]
	if hasSystemLabel {
		return systemLabelValue == "true"
	}

	systemNamespaces := defaultSystemNamespaces()

	_, isSystem := systemNamespaces[namespace.Name]

	return isSystem
}

// ToggleSystemState will set a namespace as a system namespace, or remove this state
// if isSystem is true it will set `systemNamespaceLabel` to "true" and false otherwise
// this will skip if namespace is "default" or if the required state is already set
func (kcl *KubeClient) ToggleSystemState(namespaceName string, isSystem bool) error {
	if namespaceName == "default" {
		return nil
	}

	nsService := kcl.cli.CoreV1().Namespaces()

	namespace, err := nsService.Get(context.TODO(), namespaceName, metav1.GetOptions{})
	if err != nil {
		return errors.Wrap(err, "failed fetching namespace object")
	}

	if isSystemNamespace(*namespace) == isSystem {
		return nil
	}

	if namespace.Labels == nil {
		namespace.Labels = map[string]string{}
	}

	namespace.Labels[systemNamespaceLabel] = strconv.FormatBool(isSystem)

	_, err = nsService.Update(context.TODO(), namespace, metav1.UpdateOptions{})
	if err != nil {
		return errors.Wrap(err, "failed updating namespace object")
	}

	if isSystem {
		return kcl.NamespaceAccessPoliciesDeleteNamespace(namespaceName)
	}

	return nil

}