SEO: canonical, sitemap.xml, robots.txt, JSON-LD, noindex admin

templates/layout.php

@@ -7,7 +7,8 @@
 
     <!-- SEO -->
     <meta name="description" content="<?= htmlspecialchars(($seoDescription ?? '') ?: 'Varlog est un journal personnel en ligne de Cédrix. Informatique, hack et loisirs techniques.') ?>">
-    <meta name="robots" content="index, follow">
+    <meta name="robots" content="<?= htmlspecialchars($metaRobots ?? 'index, follow') ?>">
+    <link rel="canonical" href="<?= htmlspecialchars($canonical ?? $ogUrl ?? rtrim(APP_URL, '/') . '/') ?>">
 
     <!-- Open Graph -->
     <meta property="og:title" content="<?= htmlspecialchars(($seoTitle ?? '') ?: ($title ?? 'varlog')) ?>">
@@ -25,6 +26,10 @@
     <meta property="article:published_time" content="<?= htmlspecialchars(date('c', strtotime((string)$articlePublishedAt))) ?>">
     <?php endif; ?>
 
+    <?php if (!empty($jsonLd ?? '')): ?>
+    <script type="application/ld+json"><?= $jsonLd ?></script>
+    <?php endif; ?>
+
     <!-- RSS autodiscovery -->
     <link rel="alternate" type="application/rss+xml" title="varlog" href="/feed">
 

templates/post_list.php

@@ -90,4 +90,28 @@ ob_start();
 <?php
 $content = ob_get_clean();
 $title   = 'varlog';
+
+// Pages avec curseur = contenu non-canonique → noindex
+if (!empty($cursor)) {
+    $metaRobots = 'noindex, follow';
+    $canonical  = rtrim(APP_URL, '/') . '/';
+} elseif ($filterCat !== '') {
+    $canonical = rtrim(APP_URL, '/') . '/?' . http_build_query(['cat' => $filterCat]);
+} else {
+    $canonical = rtrim(APP_URL, '/') . '/';
+}
+
+// JSON-LD WebSite sur la page d'accueil sans filtre
+if (empty($cursor) && $filterCat === '') {
+    $jsonLd = json_encode([
+        '@context' => 'https://schema.org',
+        '@type'    => 'WebSite',
+        'name'     => 'varlog',
+        'url'      => rtrim(APP_URL, '/') . '/',
+        'description' => 'Journal personnel de Cédrix. Informatique, hack et loisirs techniques.',
+        'inLanguage' => 'fr-FR',
+        'author'   => ['@type' => 'Person', 'name' => 'Cédrix'],
+    ], JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
+}
+
 include __DIR__ . '/layout.php';

templates/post_view.php

@@ -255,10 +255,45 @@ $hasSources     = (!empty($externalLinks) || !empty($files))
 $content            = ob_get_clean();
 $title              = htmlspecialchars($article['title']);
 $seoTitle           = ($article['seo_title'] ?? '') ?: $article['title'];
-$seoDescription     = $article['seo_description'] ?? '';
-$ogImage            = $article['og_image'] ?? '';
 $ogType             = 'article';
 $ogUrl              = url('post/' . rawurlencode($article['slug'] ?? ''));
+$canonical          = $ogUrl;
 $articlePublishedAt = $article['published_at'] ?? '';
 $mainClass          = 'container-fluid';
+
+// Auto-description depuis le contenu si le champ SEO est vide
+$seoDescription = $article['seo_description'] ?? '';
+if ($seoDescription === '') {
+    $plain = strip_tags((new Parsedown())->text($article['content']));
+    $plain = preg_replace('/\s+/', ' ', $plain);
+    $seoDescription = mb_strimwidth(trim((string)$plain), 0, 155, '…');
+}
+
+// og:image : cover puis fallback og_image du meta
+if ($ogImage === null || $ogImage === '') {
+    $ogImage = $article['og_image'] ?? '';
+}
+
+// JSON-LD Article
+$jsonLdData = [
+    '@context' => 'https://schema.org',
+    '@type'    => 'BlogPosting',
+    'headline' => $seoTitle,
+    'description' => $seoDescription,
+    'url'      => $canonical,
+    'datePublished' => date('c', strtotime((string)$articlePublishedAt)),
+    'dateModified'  => date('c', strtotime((string)($article['updated_at'] ?? $articlePublishedAt))),
+    'author'   => ['@type' => 'Person', 'name' => 'Cédrix'],
+    'publisher' => [
+        '@type' => 'Person',
+        'name'  => 'Cédrix',
+        'url'   => rtrim(APP_URL, '/'),
+    ],
+    'inLanguage' => 'fr-FR',
+];
+if (!empty($ogImage)) {
+    $jsonLdData['image'] = $ogImage;
+}
+$jsonLd = json_encode($jsonLdData, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
+
 include __DIR__ . '/layout.php';