mirror of
https://github.com/cert-manager/webhook-example.git
synced 2025-07-04 15:45:49 +02:00
115 lines
3.1 KiB
Go
115 lines
3.1 KiB
Go
/*
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Copyright 2023 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 resolver
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import (
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"fmt"
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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/apiserver/pkg/endpoints/openapi"
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"k8s.io/kube-openapi/pkg/common"
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"k8s.io/kube-openapi/pkg/validation/spec"
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)
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// DefinitionsSchemaResolver resolves the schema of a built-in type
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// by looking up the OpenAPI definitions.
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type DefinitionsSchemaResolver struct {
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defs map[string]common.OpenAPIDefinition
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gvkToSchema map[schema.GroupVersionKind]*spec.Schema
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}
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// NewDefinitionsSchemaResolver creates a new DefinitionsSchemaResolver.
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// An example working setup:
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// scheme = "k8s.io/client-go/kubernetes/scheme".Scheme
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// getDefinitions = "k8s.io/kubernetes/pkg/generated/openapi".GetOpenAPIDefinitions
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func NewDefinitionsSchemaResolver(scheme *runtime.Scheme, getDefinitions common.GetOpenAPIDefinitions) *DefinitionsSchemaResolver {
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gvkToSchema := make(map[schema.GroupVersionKind]*spec.Schema)
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namer := openapi.NewDefinitionNamer(scheme)
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defs := getDefinitions(func(path string) spec.Ref {
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return spec.MustCreateRef(path)
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})
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for name, def := range defs {
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_, e := namer.GetDefinitionName(name)
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gvks := extensionsToGVKs(e)
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s := def.Schema // map value not addressable, make copy
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for _, gvk := range gvks {
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gvkToSchema[gvk] = &s
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}
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}
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return &DefinitionsSchemaResolver{
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gvkToSchema: gvkToSchema,
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defs: defs,
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}
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}
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func (d *DefinitionsSchemaResolver) ResolveSchema(gvk schema.GroupVersionKind) (*spec.Schema, error) {
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s, ok := d.gvkToSchema[gvk]
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if !ok {
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return nil, fmt.Errorf("cannot resolve %v: %w", gvk, ErrSchemaNotFound)
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}
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s, err := populateRefs(func(ref string) (*spec.Schema, bool) {
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// find the schema by the ref string, and return a deep copy
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def, ok := d.defs[ref]
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if !ok {
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return nil, false
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}
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s := def.Schema
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return &s, true
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}, s)
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if err != nil {
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return nil, err
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}
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return s, nil
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}
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func extensionsToGVKs(extensions spec.Extensions) []schema.GroupVersionKind {
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gvksAny, ok := extensions[extGVK]
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if !ok {
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return nil
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}
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gvks, ok := gvksAny.([]any)
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if !ok {
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return nil
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}
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result := make([]schema.GroupVersionKind, 0, len(gvks))
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for _, gvkAny := range gvks {
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// type check the map and all fields
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gvkMap, ok := gvkAny.(map[string]any)
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if !ok {
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return nil
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}
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g, ok := gvkMap["group"].(string)
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if !ok {
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return nil
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}
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v, ok := gvkMap["version"].(string)
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if !ok {
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return nil
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}
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k, ok := gvkMap["kind"].(string)
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if !ok {
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return nil
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}
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result = append(result, schema.GroupVersionKind{
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Group: g,
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Version: v,
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Kind: k,
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})
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}
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return result
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}
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