Generate a short unique string from UUID in Go

_shortUUID.go

package main

import (
	"encoding/base32"
	"fmt"

	"github.com/google/uuid"
)

func main() {
	u := uuid.New()
	fmt.Printf("generated uuid: %s\n", u)

	su, _ := shortenUUID(u)
	fmt.Printf("shorten uuid: %s\n", su)

	du, _ := unshortenUUID(su)
	fmt.Printf("decoded uuid: %s\n", du)
}

func shortenUUID(u uuid.UUID) (string, error) {
	b, err := u.MarshalBinary()
	if err != nil {
		return "", err
	}

	encoding := getBase32Encoding()
	s := encoding.EncodeToString(b)

	return s, nil
}

func unshortenUUID(s string) (*uuid.UUID, error) {
	encoding := getBase32Encoding()
	b, err := encoding.DecodeString(s)
	if err != nil {
		return nil, err
	}

	u, err := uuid.FromBytes(b)
	return &u, err
}

func getBase32Encoding() *base32.Encoding {
	return base32.StdEncoding.WithPadding(base32.NoPadding)
}

run.sh-session

$ go run shortUUID.go
generated uuid: 1b96f573-1856-499a-89a5-179157748710
shorten uuid: DOLPK4YYKZEZVCNFC6IVO5EHCA
decoded uuid: 1b96f573-1856-499a-89a5-179157748710