ampache/ampache

<?php

declare(strict_types=1);

/**
 * vim:set softtabstop=4 shiftwidth=4 expandtab:
 *
 * LICENSE: GNU Affero General Public License, version 3 (AGPL-3.0-or-later)
 * Copyright Ampache.org, 2001-2024
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

namespace Ampache\Module\Podcast\Exchange;

use DOMDocument;
use DOMElement;
use DOMXPath;
use Generator;

/**
 * Loads a xml string
 */
final class PodcastOpmlLoader implements PodcastOpmlLoaderInterface
{
    /**
     * Load the opml file and yields the feed-urls
     *
     * @return Generator<string> Podcast feed-urls
     */
    public function load(string $xml): Generator
    {
        $dom = new DOMDocument();
        @$dom->loadXML($xml);

        $xpath = new DOMXpath($dom);
        $feeds = $xpath->query('//outline');

        if ($feeds !== false) {
            foreach ($feeds as $element) {
                /** @var DOMElement $element */
                $feedUrl = trim($element->getAttribute('xmlUrl'));

                if ($feedUrl !== '') {
                    yield $feedUrl;
                }
            }
        }
    }
}