From eca128752094533d203b6c5daf799e48a2ea94e7 Mon Sep 17 00:00:00 2001
From: John Bowdre <john@bowdre.net>
Date: Mon, 21 Aug 2023 16:11:42 -0500
Subject: [PATCH] add opengraph for share previews

---
 layouts/partials/head.html      |  1 +
 layouts/partials/opengraph.html | 98 +++++++++++++++++++++++++++++++++
 2 files changed, 99 insertions(+)
 create mode 100644 layouts/partials/opengraph.html

diff --git a/layouts/partials/head.html b/layouts/partials/head.html
index aadd85d..bf154b8 100644
--- a/layouts/partials/head.html
+++ b/layouts/partials/head.html
@@ -6,6 +6,7 @@
 {{ if .Site.Params.noindex }}<meta name="robots" content="noindex" /> {{ end }}
 
 {{ partialCached "favicon" . }}
+{{ partial "opengraph" . }}
 
 <!-- FontAwesome <https://fontawesome.com/> -->
 <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.1.2/css/all.min.css" integrity="sha512-1sCRPdkRXhBV2PBLUdRb4tMg1w2YPf37qatUFeS7zlBy7jJI8Lf4VHwWfZZfpXtYSLy85pkm9GaYVYMfw5BC1A==" crossorigin="anonymous" />
diff --git a/layouts/partials/opengraph.html b/layouts/partials/opengraph.html
new file mode 100644
index 0000000..3d2e916
--- /dev/null
+++ b/layouts/partials/opengraph.html
@@ -0,0 +1,98 @@
+{{- $summary := truncate 160 .Summary }}
+{{- $s := .Site.Params }}
+{{- $p := .Params }}
+
+{{- $relpath := "" -}}
+{{- if or $s.usePageBundles $p.usePageBundles }}
+  {{- $relpath = .Page.RelPermalink -}}
+{{- end }}
+
+{{ if eq $p.usePageBundles false }}
+  {{- $relpath = "" }}
+{{ end }}
+
+{{- with $p.description }}
+  {{- $summary = truncate 160 . }}
+{{- end }}
+{{- if .IsHome }}
+  {{- $summary = $s.description }}
+  {{- with $p.description }}
+    {{- $summary = . }}
+  {{- end }}
+{{- end }}
+{{- $site := .Site.Title }}
+{{- $title := .Title }}
+{{- $permalink := .Permalink }}
+{{- $logo := absURL $s.logo }}
+{{- $author := $s.author }}
+{{- with $p.author }}
+  {{ $author := . }}
+{{- end }}
+{{- $image := absURL $s.fallBackOgImage }}
+{{- with $p.featureImage }}
+  {{- $fullpath := ( add $relpath . ) -}}
+  {{- $image = absURL $fullpath  }}
+{{- end }}
+{{- with $p.thumbnail }}
+  {{- $fullpath := ( add $relpath . ) -}}
+  {{- $image = absURL $fullpath  }}
+{{- end }}
+{{- with $p.shareImage }}
+  {{- $fullpath := ( add $relpath . ) -}}
+  {{- $image = absURL $fullpath  }}
+{{- end }}
+<meta property="og:locale" content="{{ .Lang }}" />
+{{- if .IsHome }}
+<meta property="og:type" content="website">
+{{- else }}
+<meta property="og:type" content="article">
+{{- end }}
+<meta name="description" content="{{ $summary }}" />
+<meta property="og:url" content="{{ $permalink }}" />
+<meta property="og:title" content="{{ $title }}" />
+<meta property="og:description" content="{{ $summary }}" />
+<meta property="og:image" content="{{ $image }}" />
+{{- $keywords := "" }}
+{{- with $s.keywords }}
+  {{- $keywords = delimit $s.keywords "," }}
+{{- end }}
+{{- with $p.keywords }}
+  {{- $keywords = delimit . "," }}
+{{- end }}
+{{- with $keywords }}
+  <meta name="keywords" content="{{ $keywords }}" />
+{{- end }}
+{{- if eq .Section $s.blogDir -}}
+  {{- $date := ( .Date.Format "2006-02-01") -}}
+  {{- $date := (time .Date) }}
+  {{- $lastMod := (time .Lastmod) }}
+  <script type="application/ld+json">
+    {
+      "@context": "http://schema.org",
+      "@type": "BlogPosting",
+      "mainEntityOfPage":"{{ $permalink }}",
+      "name": "{{ $site }}",
+      "headline": {{ $title }},
+      "description": {{ $summary }},
+      "url": "{{ $permalink }}",
+      "datePublished": {{ $date  }},
+      "dateModified": {{ $lastMod }},
+      "author": {
+        "@type": "Person",
+        "name": "{{ $author }}"
+      },
+      "image":{
+        "@type":"ImageObject",
+        "url": "{{ $image }}"
+      },
+      "publisher": {
+        "@type": "Organization",
+        "logo": {
+          "@type":"ImageObject",
+          "url": "{{ $logo }}"
+        },
+        "name": "{{ $site }}"
+      }
+    }
+  </script>
+{{- end }}