mirror of
https://github.com/kubevirt/containerized-data-importer.git
synced 2025-06-03 06:30:22 +00:00
90 lines
2.6 KiB
Go
90 lines
2.6 KiB
Go
/*
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Copyright 2018 The Kubernetes 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 main
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import (
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"context"
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"fmt"
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"net/http"
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corev1 "k8s.io/api/core/v1"
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"sigs.k8s.io/controller-runtime/pkg/client"
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"sigs.k8s.io/controller-runtime/pkg/runtime/inject"
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"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
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"sigs.k8s.io/controller-runtime/pkg/webhook/admission/types"
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)
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// podValidator validates Pods
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type podValidator struct {
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client client.Client
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decoder types.Decoder
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}
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// Implement admission.Handler so the controller can handle admission request.
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var _ admission.Handler = &podValidator{}
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// podValidator admits a pod iff a specific annotation exists.
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func (v *podValidator) Handle(ctx context.Context, req types.Request) types.Response {
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pod := &corev1.Pod{}
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err := v.decoder.Decode(req, pod)
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if err != nil {
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return admission.ErrorResponse(http.StatusBadRequest, err)
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}
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allowed, reason, err := v.validatePodsFn(ctx, pod)
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if err != nil {
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return admission.ErrorResponse(http.StatusInternalServerError, err)
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}
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return admission.ValidationResponse(allowed, reason)
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}
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func (v *podValidator) validatePodsFn(ctx context.Context, pod *corev1.Pod) (bool, string, error) {
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key := "example-mutating-admission-webhook"
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anno, found := pod.Annotations[key]
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switch {
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case !found:
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return found, fmt.Sprintf("failed to find annotation with key: %q", key), nil
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case found && anno == "foo":
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return found, "", nil
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case found && anno != "foo":
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return false,
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fmt.Sprintf("the value associate with key %q is expected to be %q, but got %q", key, "foo", anno), nil
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}
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return false, "", nil
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}
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// podValidator implements inject.Client.
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// A client will be automatically injected.
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var _ inject.Client = &podValidator{}
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// InjectClient injects the client.
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func (v *podValidator) InjectClient(c client.Client) error {
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v.client = c
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return nil
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}
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// podValidator implements inject.Decoder.
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// A decoder will be automatically injected.
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var _ inject.Decoder = &podValidator{}
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// InjectDecoder injects the decoder.
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func (v *podValidator) InjectDecoder(d types.Decoder) error {
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v.decoder = d
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return nil
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}
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