<?php

/**
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; under version 2
 * of the License (non-upgradable).
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright (c) 2021 (original work) Open Assessment Technologies SA;
 */

namespace App\Request\Encoder;

use InvalidArgumentException;

class Base64UrlEncoder
{
    public static function encode(string $data, bool $usePadding = false): string
    {
        $encoded = strtr(base64_encode($data), '+/', '-_');

        return true === $usePadding ? $encoded : rtrim($encoded, '=');
    }

    public static function decode(string $data): string
    {
        $decoded = base64_decode(strtr($data, '-_', '+/'), true);

        if (false === $decoded) {
            throw new InvalidArgumentException('Invalid data provided');
        }

        return $decoded;
    }
}