mirror of
https://github.com/kubernetes-sigs/kind.git
synced 2025-11-30 23:16:04 +07:00
102 lines
3.0 KiB
Go
102 lines
3.0 KiB
Go
/*
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Copyright 2019 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 patch
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import (
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"bytes"
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"encoding/json"
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burntoml "github.com/BurntSushi/toml"
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jsonpatch "github.com/evanphx/json-patch/v5"
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toml "github.com/pelletier/go-toml"
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yaml "go.yaml.in/yaml/v3"
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"sigs.k8s.io/kind/pkg/errors"
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)
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// TOML patches toPatch with the patches (should be TOML merge patches) and patches6902 (should be JSON 6902 patches)
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func TOML(toPatch string, patches []string, patches6902 []string) (string, error) {
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// convert to JSON for patching
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j, err := tomlToJSON([]byte(toPatch))
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if err != nil {
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return "", err
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}
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// apply merge patches
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for _, patch := range patches {
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pj, err := tomlToJSON([]byte(patch))
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if err != nil {
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return "", err
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}
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patched, err := jsonpatch.MergePatch(j, pj)
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if err != nil {
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return "", errors.WithStack(err)
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}
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j = patched
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}
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// apply JSON 6902 patches
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for _, patch6902 := range patches6902 {
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patch, err := jsonpatch.DecodePatch([]byte(patch6902))
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if err != nil {
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return "", errors.WithStack(err)
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}
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patched, err := patch.Apply(j)
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if err != nil {
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return "", errors.WithStack(err)
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}
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j = patched
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}
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// convert result back to TOML
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return jsonToTOMLString(j)
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}
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// tomlToJSON converts arbitrary TOML to JSON
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func tomlToJSON(t []byte) ([]byte, error) {
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// we use github.com.pelletier/go-toml here to unmarshal arbitrary TOML to JSON
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tree, err := toml.LoadBytes(t)
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if err != nil {
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return nil, errors.WithStack(err)
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}
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b, err := json.Marshal(tree.ToMap())
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if err != nil {
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return nil, errors.WithStack(err)
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}
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return b, nil
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}
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// jsonToTOMLString converts arbitrary JSON to TOML
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func jsonToTOMLString(j []byte) (string, error) {
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var unstruct interface{}
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// We are using yaml.Unmarshal here (instead of json.Unmarshal) because the
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// Go JSON library doesn't try to pick the right number type (int, float,
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// etc.) when unmarshalling to interface{}, it just picks float64
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// universally. go-yaml does go through the effort of picking the right
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// number type, so we can preserve number type throughout this process.
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if err := yaml.Unmarshal(j, &unstruct); err != nil {
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return "", errors.WithStack(err)
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}
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// we use github.com/BurntSushi/toml here because github.com.pelletier/go-toml
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// can only marshal structs AND BurntSushi/toml is what contained uses
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// and has more canonically formatted output (we initially plan to use
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// this package for patching containerd config)
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var buff bytes.Buffer
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if err := burntoml.NewEncoder(&buff).Encode(unstruct); err != nil {
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return "", errors.WithStack(err)
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}
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return buff.String(), nil
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}
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