Zack Williams | e940c7a | 2019-08-21 14:25:39 -0700 | [diff] [blame] | 1 | /* |
| 2 | Copyright 2014 The Kubernetes Authors. |
| 3 | |
| 4 | Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | you may not use this file except in compliance with the License. |
| 6 | You may obtain a copy of the License at |
| 7 | |
| 8 | http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | |
| 10 | Unless required by applicable law or agreed to in writing, software |
| 11 | distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | See the License for the specific language governing permissions and |
| 14 | limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package json |
| 18 | |
| 19 | import ( |
| 20 | "encoding/json" |
| 21 | "fmt" |
| 22 | |
| 23 | "k8s.io/apimachinery/pkg/runtime/schema" |
| 24 | ) |
| 25 | |
| 26 | // MetaFactory is used to store and retrieve the version and kind |
| 27 | // information for JSON objects in a serializer. |
| 28 | type MetaFactory interface { |
| 29 | // Interpret should return the version and kind of the wire-format of |
| 30 | // the object. |
| 31 | Interpret(data []byte) (*schema.GroupVersionKind, error) |
| 32 | } |
| 33 | |
| 34 | // DefaultMetaFactory is a default factory for versioning objects in JSON. The object |
| 35 | // in memory and in the default JSON serialization will use the "kind" and "apiVersion" |
| 36 | // fields. |
| 37 | var DefaultMetaFactory = SimpleMetaFactory{} |
| 38 | |
| 39 | // SimpleMetaFactory provides default methods for retrieving the type and version of objects |
| 40 | // that are identified with an "apiVersion" and "kind" fields in their JSON |
| 41 | // serialization. It may be parameterized with the names of the fields in memory, or an |
| 42 | // optional list of base structs to search for those fields in memory. |
| 43 | type SimpleMetaFactory struct { |
| 44 | } |
| 45 | |
| 46 | // Interpret will return the APIVersion and Kind of the JSON wire-format |
| 47 | // encoding of an object, or an error. |
| 48 | func (SimpleMetaFactory) Interpret(data []byte) (*schema.GroupVersionKind, error) { |
| 49 | findKind := struct { |
| 50 | // +optional |
| 51 | APIVersion string `json:"apiVersion,omitempty"` |
| 52 | // +optional |
| 53 | Kind string `json:"kind,omitempty"` |
| 54 | }{} |
| 55 | if err := json.Unmarshal(data, &findKind); err != nil { |
| 56 | return nil, fmt.Errorf("couldn't get version/kind; json parse error: %v", err) |
| 57 | } |
| 58 | gv, err := schema.ParseGroupVersion(findKind.APIVersion) |
| 59 | if err != nil { |
| 60 | return nil, err |
| 61 | } |
| 62 | return &schema.GroupVersionKind{Group: gv.Group, Version: gv.Version, Kind: findKind.Kind}, nil |
| 63 | } |