/
defaulter.go
79 lines (67 loc) · 2.43 KB
/
defaulter.go
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/*
* MIT License
*
* Copyright (c) since 2021, flomesh.io Authors.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package webhook
import (
"context"
"encoding/json"
"net/http"
"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
)
type mutatingHandler struct {
defaulter Defaulter
decoder *admission.Decoder
}
var _ admission.DecoderInjector = &mutatingHandler{}
// InjectDecoder injects the decoder into a mutatingHandler.
func (h *mutatingHandler) InjectDecoder(d *admission.Decoder) error {
h.decoder = d
return nil
}
// Handle handles admission requests.
func (h *mutatingHandler) Handle(_ context.Context, req admission.Request) admission.Response {
if h.defaulter == nil {
panic("defaulter should never be nil")
}
obj := h.defaulter.RuntimeObject()
if obj == nil {
return admission.Allowed("Not supported Kind")
}
if err := h.decoder.Decode(req, obj); err != nil {
return admission.Errored(http.StatusBadRequest, err)
}
// Default the object
h.defaulter.SetDefaults(obj)
marshalled, err := json.Marshal(obj)
if err != nil {
return admission.Errored(http.StatusInternalServerError, err)
}
// Create the patch
return admission.PatchResponseFromRaw(req.Object.Raw, marshalled)
}
// DefaultingWebhookFor returns a webhook that defaults the given object.
func DefaultingWebhookFor(defaulter Defaulter) *admission.Webhook {
return &admission.Webhook{
Handler: &mutatingHandler{defaulter: defaulter},
}
}