105 lines
2.9 KiB
Go
105 lines
2.9 KiB
Go
/*
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Copyright 2022 Alibaba Group Holding Limited.
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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 extension
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import (
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"context"
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"encoding/json"
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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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"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
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)
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type CustomMutator interface {
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MutateOnCreate(ctx context.Context, obj runtime.Object) error
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MutateOnUpdate(ctx context.Context, oldObj, newObj runtime.Object) error
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}
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func WithCustomMutator(obj runtime.Object, mutator CustomMutator) *admission.Webhook {
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return &admission.Webhook{
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Handler: &mutatorForType{object: obj, mutator: mutator},
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}
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}
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type mutatorForType struct {
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mutator CustomMutator
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object runtime.Object
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decoder *admission.Decoder
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}
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func (h *mutatorForType) InjectDecoder(decoder *admission.Decoder) error {
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h.decoder = decoder
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return nil
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}
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var _ admission.DecoderInjector = &mutatorForType{}
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func (h *mutatorForType) Handle(ctx context.Context, req admission.Request) admission.Response {
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if h.mutator == nil {
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panic("mutator should never be nil")
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}
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if h.object == nil {
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panic("object should never be nil")
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}
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// Get the object in the request
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obj := h.object.DeepCopyObject()
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var err error
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switch req.Operation {
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case admissionv1.Create:
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if err := h.decoder.Decode(req, obj); err != nil {
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return admission.Errored(http.StatusBadRequest, err)
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}
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err = h.mutator.MutateOnCreate(ctx, obj)
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case admissionv1.Update:
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oldObj := obj.DeepCopyObject()
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if err := h.decoder.DecodeRaw(req.Object, obj); err != nil {
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return admission.Errored(http.StatusBadRequest, err)
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}
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if err := h.decoder.DecodeRaw(req.OldObject, oldObj); err != nil {
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return admission.Errored(http.StatusBadRequest, err)
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}
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err = h.mutator.MutateOnUpdate(ctx, oldObj, obj)
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case admissionv1.Delete:
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return admission.Allowed("")
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default:
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return admission.Errored(http.StatusBadRequest, fmt.Errorf("unknown operation request %s", 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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return validationResponseFromStatus(false, apiStatus.Status())
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}
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return admission.Denied(err.Error())
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}
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// Create the patch.
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marshalled, err := json.Marshal(obj)
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if err != nil {
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return admission.Errored(http.StatusInternalServerError, err)
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}
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return admission.PatchResponseFromRaw(req.Object.Raw, marshalled)
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}
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