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/*
Copyright 2017 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package strategicpatch
import (
"errors"
"strings"
"k8s.io/apimachinery/pkg/util/mergepatch"
openapi "k8s.io/kube-openapi/pkg/util/proto"
)
const (
patchStrategyOpenapiextensionKey = "x-kubernetes-patch-strategy"
patchMergeKeyOpenapiextensionKey = "x-kubernetes-patch-merge-key"
)
type LookupPatchItem interface {
openapi.SchemaVisitor
Error() error
Path() *openapi.Path
}
type kindItem struct {
key string
path *openapi.Path
err error
patchmeta PatchMeta
subschema openapi.Schema
hasVisitKind bool
}
func NewKindItem(key string, path *openapi.Path) *kindItem {
return &kindItem{
key: key,
path: path,
}
}
var _ LookupPatchItem = &kindItem{}
func (item *kindItem) Error() error {
return item.err
}
func (item *kindItem) Path() *openapi.Path {
return item.path
}
func (item *kindItem) VisitPrimitive(schema *openapi.Primitive) {
item.err = errors.New("expected kind, but got primitive")
}
func (item *kindItem) VisitArray(schema *openapi.Array) {
item.err = errors.New("expected kind, but got slice")
}
func (item *kindItem) VisitMap(schema *openapi.Map) {
item.err = errors.New("expected kind, but got map")
}
func (item *kindItem) VisitReference(schema openapi.Reference) {
if !item.hasVisitKind {
schema.SubSchema().Accept(item)
}
}
func (item *kindItem) VisitKind(schema *openapi.Kind) {
subschema, ok := schema.Fields[item.key]
if !ok {
item.err = FieldNotFoundError{Path: schema.GetPath().String(), Field: item.key}
return
}
mergeKey, patchStrategies, err := parsePatchMetadata(subschema.GetExtensions())
if err != nil {
item.err = err
return
}
item.patchmeta = PatchMeta{
patchStrategies: patchStrategies,
patchMergeKey: mergeKey,
}
item.subschema = subschema
}
type sliceItem struct {
key string
path *openapi.Path
err error
patchmeta PatchMeta
subschema openapi.Schema
hasVisitKind bool
}
func NewSliceItem(key string, path *openapi.Path) *sliceItem {
return &sliceItem{
key: key,
path: path,
}
}
var _ LookupPatchItem = &sliceItem{}
func (item *sliceItem) Error() error {
return item.err
}
func (item *sliceItem) Path() *openapi.Path {
return item.path
}
func (item *sliceItem) VisitPrimitive(schema *openapi.Primitive) {
item.err = errors.New("expected slice, but got primitive")
}
func (item *sliceItem) VisitArray(schema *openapi.Array) {
if !item.hasVisitKind {
item.err = errors.New("expected visit kind first, then visit array")
}
subschema := schema.SubType
item.subschema = subschema
}
func (item *sliceItem) VisitMap(schema *openapi.Map) {
item.err = errors.New("expected slice, but got map")
}
func (item *sliceItem) VisitReference(schema openapi.Reference) {
if !item.hasVisitKind {
schema.SubSchema().Accept(item)
} else {
item.subschema = schema.SubSchema()
}
}
func (item *sliceItem) VisitKind(schema *openapi.Kind) {
subschema, ok := schema.Fields[item.key]
if !ok {
item.err = FieldNotFoundError{Path: schema.GetPath().String(), Field: item.key}
return
}
mergeKey, patchStrategies, err := parsePatchMetadata(subschema.GetExtensions())
if err != nil {
item.err = err
return
}
item.patchmeta = PatchMeta{
patchStrategies: patchStrategies,
patchMergeKey: mergeKey,
}
item.hasVisitKind = true
subschema.Accept(item)
}
func parsePatchMetadata(extensions map[string]interface{}) (string, []string, error) {
ps, foundPS := extensions[patchStrategyOpenapiextensionKey]
var patchStrategies []string
var mergeKey, patchStrategy string
var ok bool
if foundPS {
patchStrategy, ok = ps.(string)
if ok {
patchStrategies = strings.Split(patchStrategy, ",")
} else {
return "", nil, mergepatch.ErrBadArgType(patchStrategy, ps)
}
}
mk, foundMK := extensions[patchMergeKeyOpenapiextensionKey]
if foundMK {
mergeKey, ok = mk.(string)
if !ok {
return "", nil, mergepatch.ErrBadArgType(mergeKey, mk)
}
}
return mergeKey, patchStrategies, nil
}
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