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// Copyright 2019 The Kubernetes Authors.
// SPDX-License-Identifier: Apache-2.0
package hasher
import (
"crypto/sha256"
"encoding/json"
"fmt"
"sort"
"sigs.k8s.io/kustomize/kyaml/yaml"
)
// SortArrayAndComputeHash sorts a string array and
// returns a hash for it
func SortArrayAndComputeHash(s []string) (string, error) {
sort.Strings(s)
data, err := json.Marshal(s)
if err != nil {
return "", err
}
return encode(hex256(string(data)))
}
// Copied from https://github.com/kubernetes/kubernetes
// /blob/master/pkg/kubectl/util/hash/hash.go
func encode(hex string) (string, error) {
if len(hex) < 10 {
return "", fmt.Errorf(
"input length must be at least 10")
}
enc := []rune(hex[:10])
for i := range enc {
switch enc[i] {
case '0':
enc[i] = 'g'
case '1':
enc[i] = 'h'
case '3':
enc[i] = 'k'
case 'a':
enc[i] = 'm'
case 'e':
enc[i] = 't'
}
}
return string(enc), nil
}
// hex256 returns the hex form of the sha256 of the argument.
func hex256(data string) string {
return fmt.Sprintf("%x", sha256.Sum256([]byte(data)))
}
// Hasher computes the hash of an RNode.
type Hasher struct{}
// Hash returns a hash of the argument.
func (h *Hasher) Hash(node *yaml.RNode) (r string, err error) {
var encoded string
switch node.GetKind() {
case "ConfigMap":
encoded, err = encodeConfigMap(node)
case "Secret":
encoded, err = encodeSecret(node)
default:
var encodedBytes []byte
encodedBytes, err = json.Marshal(node.YNode())
encoded = string(encodedBytes)
}
if err != nil {
return "", err
}
return encode(hex256(encoded))
}
func getNodeValues(
node *yaml.RNode, paths []string) (map[string]interface{}, error) {
values := make(map[string]interface{})
for _, p := range paths {
vn, err := node.Pipe(yaml.Lookup(p))
if err != nil {
return map[string]interface{}{}, err
}
if vn == nil {
values[p] = ""
continue
}
if vn.YNode().Kind != yaml.ScalarNode {
vs, err := vn.MarshalJSON()
if err != nil {
return map[string]interface{}{}, err
}
// data, binaryData and stringData are all maps
var v map[string]interface{}
json.Unmarshal(vs, &v)
values[p] = v
} else {
values[p] = vn.YNode().Value
}
}
return values, nil
}
// encodeConfigMap encodes a ConfigMap.
// Data, Kind, and Name are taken into account.
// BinaryData is included if it's not empty to avoid useless key in output.
func encodeConfigMap(node *yaml.RNode) (string, error) {
// get fields
paths := []string{"metadata/name", "data", "binaryData"}
values, err := getNodeValues(node, paths)
if err != nil {
return "", err
}
m := map[string]interface{}{
"kind": "ConfigMap",
"name": values["metadata/name"],
"data": values["data"],
}
if _, ok := values["binaryData"].(map[string]interface{}); ok {
m["binaryData"] = values["binaryData"]
}
// json.Marshal sorts the keys in a stable order in the encoding
data, err := json.Marshal(m)
if err != nil {
return "", err
}
return string(data), nil
}
// encodeSecret encodes a Secret.
// Data, Kind, Name, and Type are taken into account.
// StringData is included if it's not empty to avoid useless key in output.
func encodeSecret(node *yaml.RNode) (string, error) {
// get fields
paths := []string{"type", "metadata/name", "data", "stringData"}
values, err := getNodeValues(node, paths)
if err != nil {
return "", err
}
m := map[string]interface{}{"kind": "Secret", "type": values["type"],
"name": values["metadata/name"], "data": values["data"]}
if _, ok := values["stringData"].(map[string]interface{}); ok {
m["stringData"] = values["stringData"]
}
// json.Marshal sorts the keys in a stable order in the encoding
data, err := json.Marshal(m)
if err != nil {
return "", err
}
return string(data), nil
}
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