folio/public/feed.php

<?php

declare(strict_types=1);

define('BASE_PATH', realpath(__DIR__ . '/../'));

require_once BASE_PATH . '/src/auth.php';
require_once BASE_PATH . '/src/SiteSettings.php';
require_once BASE_PATH . '/config/config.php';
require_once BASE_PATH . '/src/ArticleManager.php';
require_once BASE_PATH . '/src/Parsedown.php';

const FEED_PAGE_SIZE = 20;

$articles    = new ArticleManager(DATA_PATH);
$privateCats = $articles->getPrivateCategories();
$Parsedown   = new Parsedown();

$now       = time();
$base      = rtrim(APP_URL, '/');
$filterCat = trim($_GET['category'] ?? '');

$all = array_values(array_filter(
    $articles->getAll(publishedOnly: true),
    static function (array $a) use ($now, $privateCats, $filterCat): bool {
        if (strtotime((string)($a['published_at'] ?? '')) > $now) {
            return false;
        }
        $cat = trim($a['category'] ?? '');
        if ($cat !== '' && in_array($cat, $privateCats, true)) {
            return false;
        }
        if ($filterCat !== '' && $cat !== $filterCat) {
            return false;
        }
        return true;
    }
));

// ─── Pagination curseur ──────────────────────────────────────────────────────
$after  = trim($_GET['after'] ?? '');
$offset = 0;
if ($after !== '') {
    foreach ($all as $i => $a) {
        if ($a['uuid'] === $after) {
            $offset = $i + 1;
            break;
        }
    }
}

$items      = array_slice($all, $offset, FEED_PAGE_SIZE);
$nextCursor = (count($all) > $offset + FEED_PAGE_SIZE)
    ? ($all[$offset + FEED_PAGE_SIZE - 1]['uuid'] ?? null)
    : null;

$feedUrl     = $base . '/feed' . ($filterCat !== '' ? '?category=' . rawurlencode($filterCat) : '');
$feedNextUrl = $nextCursor !== null ? $base . '/feed/' . $nextCursor . ($filterCat !== '' ? '?category=' . rawurlencode($filterCat) : '') : null;

$channelTitle = siteTitle() . ($filterCat !== '' ? ' — ' . $filterCat : '');
$channelDesc  = $filterCat !== '' ? 'Articles de la catégorie « ' . $filterCat . ' »' : siteClaim();

// ─── lastBuildDate ───────────────────────────────────────────────────────────
$lastBuild = '';
foreach ($all as $a) {
    $ts = (int)strtotime((string)($a['updated_at'] ?? $a['published_at'] ?? ''));
    if ($ts > (int)strtotime($lastBuild ?: '1970-01-01')) {
        $lastBuild = date(DATE_RSS, $ts);
    }
}
if ($lastBuild === '') {
    $lastBuild = date(DATE_RSS);
}

header('Content-Type: application/rss+xml; charset=UTF-8');
header('X-Content-Type-Options: nosniff');

echo '<?xml version="1.0" encoding="UTF-8"?>' . "\n";
?>
<rss version="2.0"
     xmlns:atom="http://www.w3.org/2005/Atom"
     xmlns:content="http://purl.org/rss/1.0/modules/content/"
     xmlns:fh="http://purl.org/syndication/history/1.0">
  <channel>
    <title><?= htmlspecialchars($channelTitle) ?></title>
    <link><?= htmlspecialchars($base) ?></link>
    <description><?= htmlspecialchars($channelDesc) ?></description>
    <language><?= htmlspecialchars(siteLang()) ?></language>
    <lastBuildDate><?= htmlspecialchars($lastBuild) ?></lastBuildDate>

    <atom:link href="<?= htmlspecialchars($feedUrl) ?>" rel="self" type="application/rss+xml"/>

    <?php if ($offset > 0): ?>
    <atom:link href="<?= htmlspecialchars($feedUrl) ?>" rel="first" type="application/rss+xml"/>
    <?php endif; ?>
    <?php if ($feedNextUrl !== null): ?>
    <atom:link href="<?= htmlspecialchars($feedNextUrl) ?>" rel="next" type="application/rss+xml"/>
    <?php endif; ?>

    <?php if ($feedNextUrl !== null || $offset > 0): ?>
    <fh:archive/>
    <?php endif; ?>

<?php foreach ($items as $article):
    $pubDate  = date(DATE_RSS, (int)strtotime((string)($article['published_at'] ?? $article['created_at'] ?? '')));
    $link     = $base . '/post/' . rawurlencode($article['slug'] ?? '');
    $title    = htmlspecialchars($article['title'] ?? '', ENT_XML1);
    $plain    = preg_replace('/\s+/', ' ', trim($article['plain'] ?? ''));
    $desc     = htmlspecialchars(mb_strimwidth($plain, 0, 300, '…'), ENT_XML1);
    $guid     = htmlspecialchars($base . '/post/' . rawurlencode($article['slug'] ?? ''), ENT_XML1);
    $mdPath   = DATA_PATH . '/' . ($article['uuid'] ?? '') . '/index.md';
    $rawMd    = file_exists($mdPath) ? (string)file_get_contents($mdPath) : '';
    $fullHtml = $rawMd !== '' ? $Parsedown->text($rawMd) : '';
    ?>
    <item>
      <title><?= $title ?></title>
      <link><?= htmlspecialchars($link) ?></link>
      <description><?= $desc ?></description>
      <?php if ($fullHtml !== ''): ?>
      <content:encoded><![CDATA[<?= $fullHtml ?>]]></content:encoded>
      <?php endif; ?>
      <pubDate><?= htmlspecialchars($pubDate) ?></pubDate>
      <guid isPermaLink="true"><?= $guid ?></guid>
    </item>
<?php endforeach; ?>
  </channel>
</rss>