feat(controller): administration persona (#1739)

* chore(refactor): project and api refactoring

Signed-off-by: Oliver Bähler <oliverbaehler@hotmail.com>

* chore(refactor): project and api refactoring

Signed-off-by: Oliver Bähler <oliverbaehler@hotmail.com>

---------

Signed-off-by: Oliver Bähler <oliverbaehler@hotmail.com>

internal/webhook/namespace/mutation/cordoning.go

@@ -0,0 +1,108 @@
+// Copyright 2020-2025 Project Capsule Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package mutation
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/types"
+	"k8s.io/client-go/tools/record"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
+
+	capsulev1beta2 "github.com/projectcapsule/capsule/api/v1beta2"
+	capsulewebhook "github.com/projectcapsule/capsule/internal/webhook"
+	"github.com/projectcapsule/capsule/pkg/api/meta"
+	"github.com/projectcapsule/capsule/pkg/configuration"
+	capsuleutils "github.com/projectcapsule/capsule/pkg/utils"
+)
+
+type cordoningLabelHandler struct {
+	cfg configuration.Configuration
+}
+
+func CordoningLabelHandler(cfg configuration.Configuration) capsulewebhook.TypedHandler[*corev1.Namespace] {
+	return &cordoningLabelHandler{
+		cfg: cfg,
+	}
+}
+
+func (h *cordoningLabelHandler) OnCreate(client.Client, *corev1.Namespace, admission.Decoder, record.EventRecorder) capsulewebhook.Func {
+	return func(context.Context, admission.Request) *admission.Response {
+		return nil
+	}
+}
+
+func (h *cordoningLabelHandler) OnDelete(client.Client, *corev1.Namespace, admission.Decoder, record.EventRecorder) capsulewebhook.Func {
+	return func(context.Context, admission.Request) *admission.Response {
+		return nil
+	}
+}
+
+func (h *cordoningLabelHandler) OnUpdate(
+	c client.Client,
+	ns *corev1.Namespace,
+	old *corev1.Namespace,
+	decoder admission.Decoder,
+	_ record.EventRecorder,
+) capsulewebhook.Func {
+	return func(ctx context.Context, req admission.Request) *admission.Response {
+		return h.handle(ctx, c, req, ns)
+	}
+}
+
+func (h *cordoningLabelHandler) handle(
+	ctx context.Context,
+	c client.Client,
+	req admission.Request,
+	ns *corev1.Namespace,
+) *admission.Response {
+	tnt := &capsulev1beta2.Tenant{}
+
+	ln, err := capsuleutils.GetTypeLabel(tnt)
+	if err != nil {
+		response := admission.Errored(http.StatusInternalServerError, err)
+
+		return &response
+	}
+
+	if label, ok := ns.Labels[ln]; ok {
+		if err = c.Get(ctx, types.NamespacedName{Name: label}, tnt); err != nil {
+			response := admission.Errored(http.StatusInternalServerError, err)
+
+			return &response
+		}
+	}
+
+	condition := tnt.Status.Conditions.GetConditionByType(meta.CordonedCondition)
+	if condition == nil {
+		return nil
+	}
+
+	if condition.Status != metav1.ConditionTrue {
+		return nil
+	}
+
+	labels := ns.GetLabels()
+	if _, ok := labels[meta.CordonedLabel]; ok {
+		return nil
+	}
+
+	ns.Labels[meta.CordonedLabel] = "true"
+
+	marshaled, err := json.Marshal(ns)
+	if err != nil {
+		response := admission.Errored(http.StatusInternalServerError, err)
+
+		return &response
+	}
+
+	response := admission.PatchResponseFromRaw(req.Object.Raw, marshaled)
+
+	return &response
+}