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// Copyright 2020 The Kubernetes Authors.
// SPDX-License-Identifier: Apache-2.0
package patchjson6902
import (
"strings"
jsonpatch "github.com/evanphx/json-patch/v5"
"sigs.k8s.io/kustomize/kyaml/kio"
"sigs.k8s.io/kustomize/kyaml/yaml"
k8syaml "sigs.k8s.io/yaml"
)
type Filter struct {
Patch string
decodedPatch jsonpatch.Patch
}
var _ kio.Filter = Filter{}
func (pf Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
decodedPatch, err := pf.decodePatch()
if err != nil {
return nil, err
}
pf.decodedPatch = decodedPatch
return kio.FilterAll(yaml.FilterFunc(pf.run)).Filter(nodes)
}
func (pf Filter) decodePatch() (jsonpatch.Patch, error) {
patch := pf.Patch
// If the patch doesn't look like a JSON6902 patch, we
// try to parse it to json.
if !strings.HasPrefix(pf.Patch, "[") {
p, err := k8syaml.YAMLToJSON([]byte(patch))
if err != nil {
return nil, err
}
patch = string(p)
}
decodedPatch, err := jsonpatch.DecodePatch([]byte(patch))
if err != nil {
return nil, err
}
return decodedPatch, nil
}
func (pf Filter) run(node *yaml.RNode) (*yaml.RNode, error) {
// We don't actually use the kyaml library for manipulating the
// yaml here. We just marshal it to json and rely on the
// jsonpatch library to take care of applying the patch.
// This means ordering might not be preserved with this filter.
b, err := node.MarshalJSON()
if err != nil {
return nil, err
}
res, err := pf.decodedPatch.Apply(b)
if err != nil {
return nil, err
}
err = node.UnmarshalJSON(res)
return node, err
}
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