143 lines
3.6 KiB
Go
143 lines
3.6 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 openapi
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import (
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"encoding/json"
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"fmt"
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"github.com/go-openapi/spec"
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openapi_v2 "github.com/googleapis/gnostic/OpenAPIv2"
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"github.com/googleapis/gnostic/compiler"
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yaml "gopkg.in/yaml.v2"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/kube-openapi/pkg/util/proto"
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)
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const (
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// groupVersionKindExtensionKey is the key used to lookup the
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// GroupVersionKind value for an object definition from the
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// definition's "extensions" map.
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groupVersionKindExtensionKey = "x-kubernetes-group-version-kind"
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)
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// ToProtoSchema builds the proto formatted schema from an OpenAPI spec
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func ToProtoSchema(openAPIDefinitions *spec.Definitions, gvk schema.GroupVersionKind) (proto.Schema, error) {
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openAPISpec := newMinimalValidOpenAPISpec()
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openAPISpec.Definitions = *openAPIDefinitions
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specBytes, err := json.MarshalIndent(openAPISpec, " ", " ")
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if err != nil {
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return nil, err
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}
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var info yaml.MapSlice
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err = yaml.Unmarshal(specBytes, &info)
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if err != nil {
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return nil, err
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}
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doc, err := openapi_v2.NewDocument(info, compiler.NewContext("$root", nil))
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if err != nil {
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return nil, err
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}
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models, err := proto.NewOpenAPIData(doc)
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if err != nil {
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return nil, err
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}
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for _, modelName := range models.ListModels() {
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model := models.LookupModel(modelName)
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if model == nil {
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return nil, fmt.Errorf("the ListModels function returned a model that can't be looked-up")
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}
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gvkList := parseGroupVersionKind(model)
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for _, modelGVK := range gvkList {
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if modelGVK == gvk {
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return model, nil
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}
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}
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}
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return nil, fmt.Errorf("no model found with a %v tag matching %v", groupVersionKindExtensionKey, gvk)
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}
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// newMinimalValidOpenAPISpec creates a minimal openapi spec with only the required fields filled in
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func newMinimalValidOpenAPISpec() *spec.Swagger {
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return &spec.Swagger{
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SwaggerProps: spec.SwaggerProps{
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Swagger: "2.0",
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Info: &spec.Info{
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InfoProps: spec.InfoProps{
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Title: "Kubernetes",
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Version: "0.0.0",
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},
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},
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},
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}
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}
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// parseGroupVersionKind gets and parses GroupVersionKind from the extension. Returns empty if it doesn't have one.
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func parseGroupVersionKind(s proto.Schema) []schema.GroupVersionKind {
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extensions := s.GetExtensions()
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gvkListResult := []schema.GroupVersionKind{}
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// Get the extensions
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gvkExtension, ok := extensions[groupVersionKindExtensionKey]
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if !ok {
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return []schema.GroupVersionKind{}
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}
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// gvk extension must be a list of at least 1 element.
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gvkList, ok := gvkExtension.([]interface{})
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if !ok {
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return []schema.GroupVersionKind{}
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}
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for _, gvk := range gvkList {
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// gvk extension list must be a map with group, version, and
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// kind fields
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gvkMap, ok := gvk.(map[interface{}]interface{})
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if !ok {
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continue
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}
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group, ok := gvkMap["group"].(string)
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if !ok {
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continue
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}
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version, ok := gvkMap["version"].(string)
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if !ok {
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continue
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}
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kind, ok := gvkMap["kind"].(string)
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if !ok {
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continue
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}
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gvkListResult = append(gvkListResult, schema.GroupVersionKind{
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Group: group,
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Version: version,
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Kind: kind,
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})
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}
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return gvkListResult
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}
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