Go - Shorten int64 as a String

shorten_int64.go

import (
	"encoding/base64"
	"encoding/binary"
	"strings"
)

package util

import (
	"encoding/base64"
	"encoding/binary"
	"strings"
)

func ShortenInt64(i int64) string {
	b := make([]byte, 8)
	binary.BigEndian.PutUint64(b, uint64(i))
	result := base64.RawURLEncoding.EncodeToString(b)
	return strings.TrimLeftFunc(result, func(r rune) bool { return r == 'A' })
}

func DeshortenInt64(s string) (int64, error) {
	leftPad := strings.Repeat("A", 11-len(s))
	bytes, err := base64.RawURLEncoding.DecodeString(leftPad + s)
	if err != nil {
		return 0, err
	}
	return int64(binary.BigEndian.Uint64(bytes)), nil
}