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1<?php
2
3// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the GNU Affero General Public License v3.0.
4// See the LICENCE file in the repository root for full licence text.
5
6declare(strict_types=1);
7
8namespace App\Libraries;
9
10class Base64Url
11{
12 public static function decode(string $value): ?string
13 {
14 return null_if_false(base64_decode(strtr($value, '-_', '+/'), true));
15 }
16
17 public static function encode(string $value): string
18 {
19 // url safe base64
20 // reference: https://datatracker.ietf.org/doc/html/rfc4648#section-5
21 return rtrim(strtr(base64_encode($value), '+/', '-_'), '=');
22 }
23}