From 6af3ff81a169c189e3a72be938186a4a4d9712e8 Mon Sep 17 00:00:00 2001
From: Pedro Moreno <birdydesign@tutanota.com>
Date: Wed, 15 Feb 2023 11:04:48 +0100
Subject: [PATCH] Added OpenGraph metadata for Facebook and Twitter

---
 templates/partials/metadata.html.twig | 45 +++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/templates/partials/metadata.html.twig b/templates/partials/metadata.html.twig
index 59deee3..95c5cce 100644
--- a/templates/partials/metadata.html.twig
+++ b/templates/partials/metadata.html.twig
@@ -1,3 +1,48 @@
 {% for meta in page.metadata %}
   <meta {% if meta.name %} name="{{ meta.name }}" {% endif %} {% if meta.http_equiv %} http-equiv="{{ meta.http_equiv }}" {% endif %} {% if meta.charset %} charset="{{ meta.charset }}" {% endif %} {% if meta.property %} property="{{ meta.property }}" {% endif %} {% if meta.content %} content="{{ meta.content }}" {% endif %}/>
 {% endfor %}
+
+{% set image = page.media[page.header.primaryImage] ?: page.media.all|filter((v, k) => k != page.header.avatarImage and (v.type == 'image' or v.type == 'vector'))|first %}
+
+{# Open Graph #}
+{# Partial code from https://github.com/paulcmal/grav-plugin-socialmeta #}
+
+{% if not page.metadata["og:sitename"] %}
+<meta name="og:site_name" property="og:site_name" content="{{ site.title }}" />
+{% endif %}
+{% if not page.metadata["og:title"] %}
+<meta name="og:title" property="og:title" content="{{ page.title }}" />
+{% endif %}
+{% if not page.metadata["og:description"] %}
+<meta name="og:description" property="og:description" content="{{ page.summary|striptags|truncate(150)|raw }}" />
+{% endif %}
+{% if not page.metadata["og:type"] %}
+<meta name="og:type" property="og:type" content="article" />
+{% endif %}
+{% if not page.metadata["og:url"] %}
+<meta name="og:url" property="og:url" content="{{ page.url(true)|e }}" />
+{% endif %}
+{% if not page.metadata["og:image"] and image %}
+<meta name="og:image" property="og:image" content="{{ uri.base ~ image.url|raw }}" />
+{% endif %}
+
+{# Twitter Cards #}
+{# Partial code from https://github.com/paulcmal/grav-plugin-socialmeta #}
+
+{% if not page.metadata["twitter:card"] %}
+<meta name="twitter:card" property="twitter:card" content="summary" />
+{% endif %}
+{% if not page.metadata["twitter:site"] %}
+	{% for item in theme_config.social if item.name|lower == 'twitter' %}
+    <meta name="twitter:site" property="twitter:site" content="{{ item.url }}" />
+  {% endfor %}
+{% endif %}
+{% if not page.metadata["twitter:title"] %}
+<meta name="twitter:title" property="twitter:title" content="{{ page.title }}" />
+{% endif %}
+{% if not page.metadata["twitter:description"] %}
+<meta name="twitter:description" property="twitter:description" content="{{ page.summary|striptags|truncate(150)|raw }}" />
+{% endif %}
+{% if not page.metadata["twitter:image"] and image %}
+<meta name="twitter:image" property="twitter:image" content="{{ uri.base ~ image.url|raw }}" />
+{% endif %}
\ No newline at end of file