125 lines
3.6 KiB
Go
125 lines
3.6 KiB
Go
/*
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Copyright 2020 The cert-manager 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 admission
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import (
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"context"
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"errors"
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"fmt"
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"net/http"
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admissionv1 "k8s.io/api/admission/v1"
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apierrors "k8s.io/apimachinery/pkg/api/errors"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/apimachinery/pkg/runtime/serializer"
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"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
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)
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func NewCustomValidationWebhook(
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scheme *runtime.Scheme,
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validationWebhook ValidationInterface,
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) *admission.Webhook {
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return &admission.Webhook{
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Handler: &validator{
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decoder: &internalDecoder{
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scheme: scheme,
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codecs: serializer.NewCodecFactory(scheme),
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},
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validationWebhook: validationWebhook,
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},
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}
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}
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type validator struct {
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decoder *internalDecoder
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validationWebhook ValidationInterface
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}
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// Handle handles admission requests.
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func (h *validator) Handle(ctx context.Context, req admission.Request) admission.Response {
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if h.decoder == nil {
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panic("decoder should never be nil")
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}
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// short-path
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if h.validationWebhook == nil || !h.validationWebhook.Handles(req.AdmissionRequest.Operation) {
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return admission.Allowed("")
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}
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ctx = admission.NewContextWithRequest(ctx, req)
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gvk := schema.GroupVersionKind{
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Group: req.Kind.Group,
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Version: req.Kind.Version,
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Kind: req.Kind.Kind,
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}
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var obj runtime.Object
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var oldObj runtime.Object
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var err error
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var warnings []string
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switch req.Operation {
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case admissionv1.Connect:
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// No validation for connect requests.
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// TODO(vincepri): Should we validate CONNECT requests? In what cases?
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case admissionv1.Create:
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if obj, err = h.decoder.DecodeRaw(req.Object, gvk); err != nil {
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return admission.Errored(http.StatusBadRequest, err)
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}
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warnings, err = h.validationWebhook.Validate(ctx, req.AdmissionRequest, nil, obj)
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case admissionv1.Update:
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if obj, err = h.decoder.DecodeRaw(req.Object, gvk); err != nil {
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return admission.Errored(http.StatusBadRequest, err)
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}
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if oldObj, err = h.decoder.DecodeRaw(req.OldObject, gvk); err != nil {
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return admission.Errored(http.StatusBadRequest, err)
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}
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warnings, err = h.validationWebhook.Validate(ctx, req.AdmissionRequest, oldObj, obj)
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case admissionv1.Delete:
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// In reference to PR: https://github.com/kubernetes/kubernetes/pull/76346
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// OldObject contains the object being deleted
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if oldObj, err = h.decoder.DecodeRaw(req.OldObject, gvk); err != nil {
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return admission.Errored(http.StatusBadRequest, err)
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}
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warnings, err = h.validationWebhook.Validate(ctx, req.AdmissionRequest, oldObj, nil)
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default:
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return admission.Errored(http.StatusBadRequest, fmt.Errorf("unknown operation %q", req.Operation))
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}
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// Check the error message first.
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if err != nil {
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var apiStatus apierrors.APIStatus
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if errors.As(err, &apiStatus) {
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status := apiStatus.Status()
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return admission.Response{
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AdmissionResponse: admissionv1.AdmissionResponse{
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Allowed: false,
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Result: &status,
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},
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}.WithWarnings(warnings...)
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}
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return admission.Denied(err.Error()).WithWarnings(warnings...)
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}
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// Return allowed if everything succeeded.
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return admission.Allowed("").WithWarnings(warnings...)
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}
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