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validation.go
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validation.go
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/*
Copyright 2020 The cert-manager Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package handlers
import (
"context"
"net/http"
"github.com/go-logr/logr"
admissionv1 "k8s.io/api/admission/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/runtime/serializer"
"k8s.io/apimachinery/pkg/util/validation/field"
"k8s.io/client-go/kubernetes"
"github.com/jetstack/cert-manager/pkg/internal/api/validation"
"github.com/jetstack/cert-manager/pkg/internal/apis/certmanager/validation/plugins"
)
type registryBackedValidator struct {
log logr.Logger
decoder runtime.Decoder
registry *validation.Registry
plugins []plugins.Plugin
}
func NewRegistryBackedValidator(log logr.Logger, scheme *runtime.Scheme, registry *validation.Registry) *registryBackedValidator {
factory := serializer.NewCodecFactory(scheme)
return ®istryBackedValidator{
log: log,
decoder: factory.UniversalDecoder(),
registry: registry,
plugins: plugins.All(scheme),
}
}
func (r *registryBackedValidator) InitPlugins(client kubernetes.Interface) {
for _, plugin := range r.plugins {
plugin.Init(client)
}
}
func (r *registryBackedValidator) Validate(ctx context.Context, admissionSpec *admissionv1.AdmissionRequest) *admissionv1.AdmissionResponse {
status := &admissionv1.AdmissionResponse{}
status.UID = admissionSpec.UID
// decode new version of object
obj, _, err := r.decoder.Decode(admissionSpec.Object.Raw, nil, nil)
if err != nil {
status.Allowed = false
status.Result = &metav1.Status{
Status: metav1.StatusFailure, Code: http.StatusBadRequest, Reason: metav1.StatusReasonBadRequest,
Message: err.Error(),
}
return status
}
// attempt to decode old object
var oldObj runtime.Object
if len(admissionSpec.OldObject.Raw) > 0 {
oldObj, _, err = r.decoder.Decode(admissionSpec.OldObject.Raw, nil, nil)
if err != nil {
status.Allowed = false
status.Result = &metav1.Status{
Status: metav1.StatusFailure, Code: http.StatusBadRequest, Reason: metav1.StatusReasonBadRequest,
Message: err.Error(),
}
return status
}
}
// RequestKind field is only present from Kubernetes 1.15 onwards, so
// use the regular 'kind' if RequestKind is not present
gvk := schema.GroupVersionKind{
Group: admissionSpec.Kind.Group,
Version: admissionSpec.Kind.Version,
Kind: admissionSpec.Kind.Kind,
}
if admissionSpec.RequestKind != nil {
gvk = schema.GroupVersionKind{
Group: admissionSpec.RequestKind.Group,
Version: admissionSpec.RequestKind.Version,
Kind: admissionSpec.RequestKind.Kind,
}
}
errs := field.ErrorList{}
var warnings validation.WarningList
if admissionSpec.Operation == admissionv1.Create {
// perform validation on new version of resource
e, w := r.registry.Validate(admissionSpec, obj, gvk)
errs, warnings = append(errs, e...), append(warnings, w...)
} else if admissionSpec.Operation == admissionv1.Update {
// perform update validation on resource
e, w := r.registry.ValidateUpdate(admissionSpec, oldObj, obj, gvk)
errs, warnings = append(errs, e...), append(warnings, w...)
}
// TODO: implement warnings for Plugin interface
// If no validation errors occurred, perform plugin checks.
if len(errs) == 0 {
for _, plugin := range r.plugins {
if err := plugin.Validate(ctx, admissionSpec, oldObj, obj); err != nil {
errs = append(errs, err)
}
}
}
status.Warnings = warnings
// return with allowed = false if any errors occurred
if err := errs.ToAggregate(); err != nil {
status.Allowed = false
status.Result = &metav1.Status{
Status: metav1.StatusFailure, Code: http.StatusNotAcceptable, Reason: metav1.StatusReasonNotAcceptable,
Message: err.Error(),
}
return status
}
status.Allowed = true
return status
}