applyset_id.go

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package main

import (
	"crypto/sha256"
	"encoding/base64"
	"fmt"
	"strings"
)

const (
	V1ApplySetIdFormat      = "applyset-%s-v1"
	applySetIDPartDelimiter = "."
)

type ApplySet struct {
	parentRefName,
	parentRefNamespace,
	parentRefKind,
	parentRefGroup string
}

func (a ApplySet) ID() string {
	unencoded := strings.Join([]string{a.parentRefName, a.parentRefNamespace, a.parentRefKind, a.parentRefGroup}, applySetIDPartDelimiter)
	hashed := sha256.Sum256([]byte(unencoded))
	b64 := base64.RawURLEncoding.EncodeToString(hashed[:])
	// Label values must start and end with alphanumeric values, so add a known-safe prefix and suffix.
	return fmt.Sprintf(V1ApplySetIdFormat, b64)
}

func main() {
	fmt.Println(ApplySet{
		parentRefName:      "automata",
		parentRefNamespace: "",
		parentRefKind:      "ApplySet",
		parentRefGroup:     "starjunk.net",
	}.ID())
}