feat: flux RSS sur /feed (publies uniquement, autodiscovery dans le head)

public/.htaccess

@@ -11,6 +11,9 @@ RewriteRule ^ - [L]
 # URL propre pour les articles : /post/<slug>
 RewriteRule ^post/([a-z0-9][a-z0-9-]*)/?$ /index.php?action=view&slug=$1 [L,QSA]
 
+# Flux RSS
+RewriteRule ^feed/?$ /feed.php [L]
+
 # Ajoute .php si le fichier correspondant existe
 RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI}.php -f
 RewriteRule ^(.+?)/?$ /$1.php [L,QSA]

public/feed.php

@@ -0,0 +1,67 @@
+<?php
+
+declare(strict_types=1);
+
+define('BASE_PATH', realpath(__DIR__ . '/../'));
+
+if (session_status() === PHP_SESSION_NONE) {
+    $isHttps = !empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off';
+    session_set_cookie_params(['lifetime' => 0, 'path' => '/', 'secure' => $isHttps, 'httponly' => true, 'samesite' => 'Lax']);
+    session_start();
+}
+
+require_once BASE_PATH . '/src/auth.php';
+require_once BASE_PATH . '/config/config.php';
+require_once BASE_PATH . '/src/ArticleManager.php';
+
+$articles = new ArticleManager(BASE_PATH . '/data');
+
+$now  = time();
+$base = rtrim(APP_URL, '/');
+
+$items = array_filter(
+    $articles->getAll(publishedOnly: true),
+    static fn (array $a): bool => strtotime((string)($a['published_at'] ?? '')) <= $now
+);
+
+$lastBuild = '';
+foreach ($items as $a) {
+    $ts = strtotime((string)($a['updated_at'] ?? $a['published_at'] ?? ''));
+    if ($ts && $ts > strtotime($lastBuild ?: '1970-01-01')) {
+        $lastBuild = date(DATE_RSS, $ts);
+    }
+}
+if ($lastBuild === '') {
+    $lastBuild = date(DATE_RSS);
+}
+
+header('Content-Type: application/rss+xml; charset=UTF-8');
+header('X-Content-Type-Options: nosniff');
+
+echo '<?xml version="1.0" encoding="UTF-8"?>' . "\n";
+?>
+<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
+  <channel>
+    <title>varlog</title>
+    <link><?= htmlspecialchars($base) ?></link>
+    <description>Journal personnel de Cédrix — informatique, hack et loisirs techniques.</description>
+    <language>fr</language>
+    <lastBuildDate><?= htmlspecialchars($lastBuild) ?></lastBuildDate>
+    <atom:link href="<?= htmlspecialchars($base . '/feed') ?>" rel="self" type="application/rss+xml"/>
+<?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);
+    $desc     = htmlspecialchars(mb_strimwidth(strip_tags($article['content'] ?? ''), 0, 300, '…'), ENT_XML1);
+    $guid     = htmlspecialchars($base . '/post/' . rawurlencode($article['slug'] ?? ''), ENT_XML1);
+    ?>
+    <item>
+      <title><?= $title ?></title>
+      <link><?= htmlspecialchars($link) ?></link>
+      <description><?= $desc ?></description>
+      <pubDate><?= htmlspecialchars($pubDate) ?></pubDate>
+      <guid isPermaLink="true"><?= $guid ?></guid>
+    </item>
+<?php endforeach; ?>
+  </channel>
+</rss>