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defaulter_handler.go
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/
defaulter_handler.go
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/*
Copyright 2018 The Kubernetes 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 admission
import (
"context"
"encoding/json"
goerrors "errors"
"net/http"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/runtime"
)
// DefaulterFor defines functions for setting defaults on resources.
type DefaulterFor interface {
For
Default(ctx context.Context, obj runtime.Object) error
}
// DefaulterForToWebhook creates a new Webhook for a DefaulterFor interface.
func DefaulterForToWebhook(defaulter DefaulterFor) *Webhook {
return &Webhook{
Handler: &defaulterForType{handler: defaulter},
}
}
type defaulterForType struct {
handler DefaulterFor
decoder *Decoder
}
var _ DecoderInjector = &defaulterForType{}
func (h *defaulterForType) InjectDecoder(d *Decoder) error {
h.decoder = d
return nil
}
// Handle handles admission requests.
func (h *defaulterForType) Handle(ctx context.Context, req Request) Response {
if h.handler == nil {
panic("defaulter should never be nil")
}
// Get the object in the request
obj := h.handler.For().DeepCopyObject()
if err := h.decoder.Decode(req, obj); err != nil {
return Errored(http.StatusBadRequest, err)
}
// Default the object
if err := h.handler.Default(ctx, obj); err != nil {
var apiStatus apierrors.APIStatus
if goerrors.As(err, &apiStatus) {
return validationResponseFromStatus(false, apiStatus.Status())
}
return Denied(err.Error())
}
marshalled, err := json.Marshal(obj)
if err != nil {
return Errored(http.StatusInternalServerError, err)
}
// Create the patch
return PatchResponseFromRaw(req.Object.Raw, marshalled)
}