88 lines
2.6 KiB
Go
88 lines
2.6 KiB
Go
/*
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Copyright 2019 The Jetstack cert-manager contributors.
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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 handlers
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import (
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"fmt"
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"net/http"
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"github.com/go-logr/logr"
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admissionv1beta1 "k8s.io/api/admission/v1beta1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/apimachinery/pkg/runtime/serializer"
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"k8s.io/apimachinery/pkg/util/validation/field"
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)
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type funcBackedValidator struct {
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log logr.Logger
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decoder runtime.Decoder
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validations map[schema.GroupVersionKind]ValidationFunc
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}
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func NewFuncBackedValidator(log logr.Logger, scheme *runtime.Scheme, fns map[schema.GroupVersionKind]ValidationFunc) *funcBackedValidator {
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factory := serializer.NewCodecFactory(scheme)
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return &funcBackedValidator{
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log: log,
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// TODO: switch to using UniversalDecoder and make validation functions
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// run against the internal apiversion
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decoder: factory.UniversalDeserializer(),
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validations: fns,
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}
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}
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type ValidationFunc func(runtime.Object) field.ErrorList
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func (c *funcBackedValidator) Validate(admissionSpec *admissionv1beta1.AdmissionRequest) *admissionv1beta1.AdmissionResponse {
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status := &admissionv1beta1.AdmissionResponse{}
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obj, gvk, err := c.decoder.Decode(admissionSpec.Object.Raw, nil, nil)
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if err != nil {
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status.Allowed = false
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status.Result = &metav1.Status{
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Status: metav1.StatusFailure, Code: http.StatusBadRequest, Reason: metav1.StatusReasonBadRequest,
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Message: err.Error(),
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}
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return status
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}
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validate, ok := c.validations[*gvk]
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if !ok {
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status.Allowed = false
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status.Result = &metav1.Status{
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Status: metav1.StatusFailure, Code: http.StatusInternalServerError, Reason: metav1.StatusReasonInternalError,
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Message: fmt.Sprintf("No validation function registered for GVK: %v", gvk.String()),
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}
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return status
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}
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err = validate(obj).ToAggregate()
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if err != nil {
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status.Allowed = false
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status.Result = &metav1.Status{
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Status: metav1.StatusFailure, Code: http.StatusNotAcceptable, Reason: metav1.StatusReasonNotAcceptable,
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Message: err.Error(),
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}
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return status
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}
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status.Allowed = true
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return status
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}
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