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Add Open Graph and Twitter Card meta tags to all public pages

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- templates/public/head.php: add centralised OG/Twitter tag rendering via $ogTags array;
  supports type, title, description, url, image, image_alt, site_name, article_author,
  article_published_time; twitter:card switches between summary_large_image / summary
  based on presence of og:image

- public/tfe.php: populate full article OG tags — og:type=article, canonical URL,
  og:image resolved from banner_path → first image file in thesis_files → omitted,
  og:image:alt, article:author, article:published_time (year-01-01); twitter:card
  summary_large_image when image present

- public/index.php, search.php, apropos.php, licence.php: add basic og:type=website
  tags (title, description, canonical url, site_name)

Sharing a thesis link on Slack, WhatsApp, iMessage, or any social platform will now
render a rich preview card with the thesis title, synopsis excerpt, and cover/banner image.
This commit is contained in:
Pontoporeia
2026-03-29 15:43:21 +02:00
parent 1dee1ea73f
commit 3a8ffa6afe
7 changed files with 105 additions and 3 deletions
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41
templates/public/head.php
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@@ -7,6 +7,47 @@
<?php if (!empty($metaDescription)): ?>
<meta name="description" content="<?= htmlspecialchars($metaDescription) ?>">
<?php endif; ?>
<?php
// Open Graph / Twitter Card tags — populated per-page via $ogTags array.
// Keys: type, title, description, url, image, image_alt, site_name, article_author, article_published_time
if (!empty($ogTags)):
$ogType = $ogTags['type'] ?? 'website';
$ogTitle = $ogTags['title'] ?? ($pageTitle ?? 'Posterg');
$ogDescription = $ogTags['description'] ?? ($metaDescription ?? '');
$ogUrl = $ogTags['url'] ?? '';
$ogImage = $ogTags['image'] ?? '';
$ogImageAlt = $ogTags['image_alt'] ?? $ogTitle;
$ogSiteName = $ogTags['site_name'] ?? 'Posterg – ERG';
?>
<meta property="og:type" content="<?= htmlspecialchars($ogType) ?>">
<meta property="og:site_name" content="<?= htmlspecialchars($ogSiteName) ?>">
<meta property="og:title" content="<?= htmlspecialchars($ogTitle) ?>">
<?php if (!empty($ogDescription)): ?>
<meta property="og:description" content="<?= htmlspecialchars($ogDescription) ?>">
<?php endif; ?>
<?php if (!empty($ogUrl)): ?>
<meta property="og:url" content="<?= htmlspecialchars($ogUrl) ?>">
<?php endif; ?>
<?php if (!empty($ogImage)): ?>
<meta property="og:image" content="<?= htmlspecialchars($ogImage) ?>">
<meta property="og:image:alt" content="<?= htmlspecialchars($ogImageAlt) ?>">
<?php endif; ?>
<?php if (!empty($ogTags['article_author'])): ?>
<meta property="article:author" content="<?= htmlspecialchars($ogTags['article_author']) ?>">
<?php endif; ?>
<?php if (!empty($ogTags['article_published_time'])): ?>
<meta property="article:published_time" content="<?= htmlspecialchars($ogTags['article_published_time']) ?>">
<?php endif; ?>
<meta name="twitter:card" content="<?= !empty($ogImage) ? 'summary_large_image' : 'summary' ?>">
<meta name="twitter:title" content="<?= htmlspecialchars($ogTitle) ?>">
<?php if (!empty($ogDescription)): ?>
<meta name="twitter:description" content="<?= htmlspecialchars($ogDescription) ?>">
<?php endif; ?>
<?php if (!empty($ogImage)): ?>
<meta name="twitter:image" content="<?= htmlspecialchars($ogImage) ?>">
<meta name="twitter:image:alt" content="<?= htmlspecialchars($ogImageAlt) ?>">
<?php endif; ?>
<?php endif; ?>
<link rel="icon" type="image/svg+xml" href="/assets/admin_favicon.svg">
<link rel="stylesheet" href="assets/modern-normalize.min.css">
<link rel="stylesheet" href="assets/common.css">