137 lines
3.6 KiB
PHP
137 lines
3.6 KiB
PHP
<?php
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declare(strict_types=1);
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namespace App\Feed;
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use App\Magnet\MagnetGenerator;
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use App\Magnetico\Entity\Torrent;
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use App\Magnetico\Repository\TorrentRepository;
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use Doctrine\ORM\QueryBuilder;
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use Suin\RSSWriter\{Channel, Feed, Item};
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use Symfony\Component\Routing\{Generator\UrlGeneratorInterface, RouterInterface};
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/**
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* Generates RSS feed.
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*
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* @see https://www.bittorrent.org/beps/bep_0036.html
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*/
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class RssGenerator
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{
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private const PER_PAGE = 1000;
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private const MIME_TYPE = 'application/x-bittorrent';
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private TorrentRepository $repo;
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private RouterInterface $router;
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private MagnetGenerator $magnetGenerator;
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public function __construct(TorrentRepository $repo, RouterInterface $router, MagnetGenerator $magnetGenerator)
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{
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$this->repo = $repo;
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$this->router = $router;
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$this->magnetGenerator = $magnetGenerator;
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}
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public function generateLast(int $page): string
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{
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$qb = $this->createLastTorrentsQueryBuilder(self::PER_PAGE, $page * self::PER_PAGE);
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$feed = $this->createFeedFromTorrents($qb->getQuery()->getResult());
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return $feed->render();
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}
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/**
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* @param Torrent[] $torrents
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*
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* @return Feed
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*/
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private function createFeedFromTorrents(array $torrents): Feed
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{
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$feed = new Feed();
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$channel = $this->createChannel();
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$feed->addChannel($channel);
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foreach ($this->createItemsFromTorrents($torrents) as $item) {
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$channel->addItem($item);
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}
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// TODO feed pagination
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// @see https://tools.ietf.org/html/rfc5005#section-3
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return $feed;
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}
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private function createChannel(): Channel
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{
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$time = time();
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$channel = new Channel();
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$channel
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->title('Last')
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->description('Last torrents')
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->url($this->generateUrl('index'))
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->feedUrl($this->generateUrl('api_v1_rss_last'))
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->language('en-US')
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->pubDate($time)
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->lastBuildDate($time)
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->ttl(15)
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;
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return $channel;
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}
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/**
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* @param Torrent[] $torrents
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*
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* @return Item[]
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*/
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private function createItemsFromTorrents(array $torrents): array
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{
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$items = [];
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foreach ($torrents as $torrent) {
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$items[] = $this->createItemFromTorrent($torrent);
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}
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return $items;
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}
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private function createItemFromTorrent(Torrent $torrent): Item
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{
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$item = new Item();
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$item
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->title($torrent->getName())
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->description($torrent->getInfoHash())
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->pubDate($torrent->getDiscoveredOn())
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->url($this->generateUrl('torrents_show', ['id' => $torrent->getId()]))
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->enclosure(
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$this->magnetGenerator->generate($torrent->getInfoHash(), $torrent->getName()),
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$torrent->getTotalSize(),
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self::MIME_TYPE
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)
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->guid($torrent->getInfoHash())
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;
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return $item;
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}
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private function createLastTorrentsQueryBuilder(int $limit = self::PER_PAGE, int $offset = 0): QueryBuilder
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{
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$qb = $this->repo->createQueryBuilder('t');
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$qb
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->select('t')
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->orderBy('t.id', 'DESC')
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->setMaxResults($limit)
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->setFirstResult($offset)
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;
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return $qb;
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}
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private function generateUrl(string $route, array $parameters = []): string
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{
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return $this->router->generate($route, $parameters, UrlGeneratorInterface::ABSOLUTE_URL);
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}
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}
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