180 lines
7.3 KiB
Go
180 lines
7.3 KiB
Go
/*
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Copyright 2022 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package validatingadmissionpolicy
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import (
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"context"
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"sigs.k8s.io/structured-merge-diff/v4/fieldpath"
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apiequality "k8s.io/apimachinery/pkg/api/equality"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/util/validation/field"
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"k8s.io/apiserver/pkg/authorization/authorizer"
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"k8s.io/apiserver/pkg/storage/names"
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"k8s.io/kubernetes/pkg/api/legacyscheme"
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"k8s.io/kubernetes/pkg/apis/admissionregistration"
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"k8s.io/kubernetes/pkg/apis/admissionregistration/validation"
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"k8s.io/kubernetes/pkg/registry/admissionregistration/resolver"
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)
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// validatingAdmissionPolicyStrategy implements verification logic for ValidatingAdmissionPolicy.
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type validatingAdmissionPolicyStrategy struct {
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runtime.ObjectTyper
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names.NameGenerator
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authorizer authorizer.Authorizer
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resourceResolver resolver.ResourceResolver
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}
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// NewStrategy is the default logic that applies when creating and updating validatingAdmissionPolicy objects.
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func NewStrategy(authorizer authorizer.Authorizer, resourceResolver resolver.ResourceResolver) *validatingAdmissionPolicyStrategy {
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return &validatingAdmissionPolicyStrategy{
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ObjectTyper: legacyscheme.Scheme,
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NameGenerator: names.SimpleNameGenerator,
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authorizer: authorizer,
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resourceResolver: resourceResolver,
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}
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}
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// NamespaceScoped returns false because ValidatingAdmissionPolicy is cluster-scoped resource.
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func (v *validatingAdmissionPolicyStrategy) NamespaceScoped() bool {
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return false
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}
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// PrepareForCreate clears the status of an validatingAdmissionPolicy before creation.
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func (v *validatingAdmissionPolicyStrategy) PrepareForCreate(ctx context.Context, obj runtime.Object) {
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ic := obj.(*admissionregistration.ValidatingAdmissionPolicy)
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ic.Status = admissionregistration.ValidatingAdmissionPolicyStatus{}
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ic.Generation = 1
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}
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// PrepareForUpdate clears fields that are not allowed to be set by end users on update.
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func (v *validatingAdmissionPolicyStrategy) PrepareForUpdate(ctx context.Context, obj, old runtime.Object) {
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newIC := obj.(*admissionregistration.ValidatingAdmissionPolicy)
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oldIC := old.(*admissionregistration.ValidatingAdmissionPolicy)
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// Prevent any update on the Status object
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newIC.Status = oldIC.Status
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// Any changes to the spec increment the generation number, any changes to the
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// status should reflect the generation number of the corresponding object.
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// See metav1.ObjectMeta description for more information on Generation.
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if !apiequality.Semantic.DeepEqual(oldIC.Spec, newIC.Spec) {
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newIC.Generation = oldIC.Generation + 1
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}
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}
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// Validate validates a new validatingAdmissionPolicy.
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func (v *validatingAdmissionPolicyStrategy) Validate(ctx context.Context, obj runtime.Object) field.ErrorList {
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errs := validation.ValidateValidatingAdmissionPolicy(obj.(*admissionregistration.ValidatingAdmissionPolicy))
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if len(errs) == 0 {
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// if the object is well-formed, also authorize the paramKind
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if err := v.authorizeCreate(ctx, obj); err != nil {
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errs = append(errs, field.Forbidden(field.NewPath("spec", "paramKind"), err.Error()))
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}
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}
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return errs
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}
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// WarningsOnCreate returns warnings for the creation of the given object.
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func (v *validatingAdmissionPolicyStrategy) WarningsOnCreate(ctx context.Context, obj runtime.Object) []string {
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return nil
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}
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// Canonicalize normalizes the object after validation.
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func (v *validatingAdmissionPolicyStrategy) Canonicalize(obj runtime.Object) {
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}
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// AllowCreateOnUpdate is true for validatingAdmissionPolicy; this means you may create one with a PUT request.
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func (v *validatingAdmissionPolicyStrategy) AllowCreateOnUpdate() bool {
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return false
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}
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// ValidateUpdate is the default update validation for an end user.
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func (v *validatingAdmissionPolicyStrategy) ValidateUpdate(ctx context.Context, obj, old runtime.Object) field.ErrorList {
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errs := validation.ValidateValidatingAdmissionPolicyUpdate(obj.(*admissionregistration.ValidatingAdmissionPolicy), old.(*admissionregistration.ValidatingAdmissionPolicy))
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if len(errs) == 0 {
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// if the object is well-formed, also authorize the paramKind
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if err := v.authorizeUpdate(ctx, obj, old); err != nil {
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errs = append(errs, field.Forbidden(field.NewPath("spec", "paramKind"), err.Error()))
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}
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}
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return errs
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}
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// WarningsOnUpdate returns warnings for the given update.
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func (v *validatingAdmissionPolicyStrategy) WarningsOnUpdate(ctx context.Context, obj, old runtime.Object) []string {
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return nil
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}
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// AllowUnconditionalUpdate is the default update policy for validatingAdmissionPolicy objects. Status update should
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// only be allowed if version match.
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func (v *validatingAdmissionPolicyStrategy) AllowUnconditionalUpdate() bool {
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return false
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}
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// GetResetFields returns the set of fields that get reset by the strategy
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// and should not be modified by the user.
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func (v *validatingAdmissionPolicyStrategy) GetResetFields() map[fieldpath.APIVersion]*fieldpath.Set {
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fields := map[fieldpath.APIVersion]*fieldpath.Set{
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"admissionregistration.k8s.io/v1alpha1": fieldpath.NewSet(
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fieldpath.MakePathOrDie("status"),
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),
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}
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return fields
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}
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type validatingAdmissionPolicyStatusStrategy struct {
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*validatingAdmissionPolicyStrategy
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}
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// ValidateUpdate is the default update validation of an update to the status object.
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func (s *validatingAdmissionPolicyStatusStrategy) ValidateUpdate(ctx context.Context, obj, old runtime.Object) field.ErrorList {
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return validation.ValidateValidatingAdmissionPolicyStatusUpdate(obj.(*admissionregistration.ValidatingAdmissionPolicy), old.(*admissionregistration.ValidatingAdmissionPolicy))
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}
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// PrepareForUpdate differs from the main strategy where setting the spec is not
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// allowed, but setting status is OK.
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func (s *validatingAdmissionPolicyStatusStrategy) PrepareForUpdate(ctx context.Context, obj, old runtime.Object) {
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newIC := obj.(*admissionregistration.ValidatingAdmissionPolicy)
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oldIC := old.(*admissionregistration.ValidatingAdmissionPolicy)
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// Prevent any update on the Spec object from Status Strategy
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newIC.Spec = oldIC.Spec
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metav1.ResetObjectMetaForStatus(&newIC.ObjectMeta, &oldIC.ObjectMeta)
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// No change in the generation.
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}
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// GetResetFields returns the set of fields that get reset by the strategy
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// and should not be modified by the user.
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func (s *validatingAdmissionPolicyStatusStrategy) GetResetFields() map[fieldpath.APIVersion]*fieldpath.Set {
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return map[fieldpath.APIVersion]*fieldpath.Set{
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"admissionregistration.k8s.io/v1alpha1": fieldpath.NewSet(
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fieldpath.MakePathOrDie("spec"),
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fieldpath.MakePathOrDie("metadata"),
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),
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}
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}
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// NewStatusStrategy creates a strategy for operating the status object.
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func NewStatusStrategy(policyStrategy *validatingAdmissionPolicyStrategy) *validatingAdmissionPolicyStatusStrategy {
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return &validatingAdmissionPolicyStatusStrategy{validatingAdmissionPolicyStrategy: policyStrategy}
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}
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