<?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) 2020 (original work) Open Assessment Technologies SA
 */

declare(strict_types=1);

namespace oat\tao\model\http;

use oat\oatbox\service\ConfigurableService;
use Psr\Http\Message\StreamInterface;
use tao_helpers_File;

class ContentDetector extends ConfigurableService
{

    private const MIMETYPES = [
        tao_helpers_File::MIME_SVG,
    ];

    public function isGzip(StreamInterface $stream): bool
    {
        $string = $stream->read(3);
        $stream->rewind();

        return (0 === mb_strpos($string, "\x1f\x8b\x08"));
    }

    public function isGzipableMime(?string $mimetype): bool
    {
        return in_array($mimetype, self::MIMETYPES);
    }
}