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Mengqi Yu
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| /* | ||
| 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 webhook | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/json" | ||
| "net/http" | ||
|
|
||
| "k8s.io/apimachinery/pkg/runtime" | ||
| "sigs.k8s.io/controller-runtime/pkg/runtime/inject" | ||
| "sigs.k8s.io/controller-runtime/pkg/webhook/admission" | ||
| ) | ||
|
|
||
| // Defaulter defines functions for setting defaults on resources | ||
| type Defaulter interface { | ||
| runtime.Object | ||
| Default() | ||
| } | ||
|
|
||
| // newDefaultingWebhookFor creates a new admission.Webhook for Defaulting the provided type. | ||
| // Returns nil if o does not implement the Defaulter interface. | ||
| func newDefaultingWebhookFor(o runtime.Object) *admission.Webhook { | ||
| d, ok := o.(Defaulter) | ||
| if !ok { | ||
| // Type doesn't implement function for mutating webhook | ||
| return nil | ||
| } | ||
| return &admission.Webhook{ | ||
| Handler: &mutatingHandler{defaulter: d}, | ||
| } | ||
| } | ||
|
|
||
| type mutatingHandler struct { | ||
| defaulter Defaulter | ||
| scheme *runtime.Scheme | ||
| decoder *admission.Decoder | ||
| } | ||
|
|
||
| var _ inject.Scheme = &mutatingHandler{} | ||
|
|
||
| // InjectScheme injects the scheme into mutatingHandler and initialize a decoder using the scheme. | ||
| func (h *mutatingHandler) InjectScheme(s *runtime.Scheme) error { | ||
| h.scheme = s | ||
| var err error | ||
| h.decoder, err = admission.NewDecoder(h.scheme) | ||
| if err != nil { | ||
| log.Error(err, "unable to get a decoder from the scheme for mutatingHandler") | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // Handle handles admission requests. | ||
| func (h *mutatingHandler) Handle(ctx context.Context, req admission.Request) admission.Response { | ||
| if h.defaulter == nil { | ||
| return admission.Allowed("") | ||
| } | ||
|
|
||
| // Get the object in the request | ||
| obj := h.defaulter.DeepCopyObject().(Defaulter) | ||
| err := h.decoder.Decode(req.Object, obj) | ||
| if err != nil { | ||
| return admission.Errored(http.StatusBadRequest, err) | ||
| } | ||
|
|
||
| // Default the object | ||
| obj.Default() | ||
| marshalled, err := json.Marshal(obj) | ||
| if err != nil { | ||
| return admission.Errored(http.StatusInternalServerError, err) | ||
| } | ||
|
|
||
| // Create the patch | ||
| return admission.PatchResponseFromRaw(req.Object.Raw, marshalled) | ||
| } |
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