{{ $permalink := .Permalink }}
{{ $permalink_pretty := .Permalink | replaceRE "\\.html$" "/" }} <!-- Always have a trailing slash, even with uglyURLs enabled. -->
<meta property="og:title" content="{{ .Title }}" />
<meta property="og:description"
      content="{{ with .Description }}{{ . | markdownify | plainify }}{{ else }}{{ if .IsPage }}{{ partial "summary_minus_toc.html" . | markdownify | plainify }}{{ else }}{{ with .Site.Params.description }}{{ . | markdownify | plainify }}{{ end }}{{ end }}{{ end }}" />
<meta property="og:type" content="{{ if .IsPage }}article{{ else }}website{{ end }}" />
<meta property="og:url" content="{{ .Permalink }}" />
{{ with .Params.images }}
    {{ range first 6 . }}
        {{ if (findRE "^/" .) }} <!-- If image link has a leading slash -->
            <!-- Cannot use absURL below because it doesn't work as expected if baseURL has a subdir.
                 See https://hugo-sandbox.netlify.com/subdir-canonify-true/ .
            -->
            {{ $baseurl_no_trailing_slash := $.Site.BaseURL | replaceRE "/$" "" }}
            <meta name="og:image" content="{{ (printf "%s%s" $baseurl_no_trailing_slash .) }}"/>
        {{ else }}
            <meta name="og:image" content="{{ (printf "%s%s" $permalink_pretty .) }}"/>
        {{ end }}
    {{ end }}
{{ end }}
{{ if .IsPage }}
    {{ if not .PublishDate.IsZero }}
        <meta property="article:published_time" content="{{ .PublishDate.Format "2006-01-02T15:04:05-07:00" | safeHTML }}"/>
    {{ else if not .Date.IsZero }}
        <meta property="article:published_time" content="{{ .Date.Format "2006-01-02T15:04:05-07:00" | safeHTML }}"/>
    {{ end }}
    {{ if not .Lastmod.IsZero }}
        <meta property="article:modified_time" content="{{ .Lastmod.Format "2006-01-02T15:04:05-07:00" | safeHTML }}"/>
    {{ end }}
{{ else }}
    {{ if not .Date.IsZero }}
        <meta property="og:updated_time" content="{{ .Date.Format "2006-01-02T15:04:05-07:00" | safeHTML }}"/>
    {{ end }}
{{ end }}
{{ with .Params.audio }}
    {{ if (findRE "^/" .) }} <!-- If audio link has a leading slash -->
        {{ $baseurl_no_trailing_slash := $.Site.BaseURL | replaceRE "/$" "" }}
        <meta name="og:audio" content="{{ (printf "%s%s" $baseurl_no_trailing_slash .) }}"/>
    {{ else }}
        <meta name="og:audio" content="{{ (printf "%s%s" $permalink_pretty .) }}"/>
    {{ end }}
{{ end }}
{{ with .Params.locale }}
    <meta property="og:locale" content="{{ . }}" />
{{ end }}
{{ with .Site.Params.title }}
    <meta property="og:site_name" content="{{ . }}" />
{{ end }}
{{ with .Params.videos }}
    {{ range . }}
        {{ if (findRE "^/" .) }} <!-- If video link has a leading slash -->
            {{ $baseurl_no_trailing_slash := $.Site.BaseURL | replaceRE "/$" "" }}
            <meta name="og:video" content="{{ (printf "%s%s" $baseurl_no_trailing_slash .) }}"/>
        {{ else }}
            <meta name="og:video" content="{{ (printf "%s%s" $permalink_pretty .) }}"/>
        {{ end }}
    {{ end }}
{{ end }}
<!-- If it is part of a series, link to related articles -->
{{ $siteSeries := .Site.Taxonomies.series }}
{{ if $siteSeries }}
    {{ with .Params.series }}
        {{ range $name := . }}
            {{ $series := index $siteSeries $name }}
            {{ range $page := first 6 $series.Pages }}
                {{ if ne $page.Permalink $permalink }}
                    <meta property="og:see_also" content="{{ $page.Permalink }}" />
                {{ end }}
            {{ end }}
        {{ end }}
    {{ end }}
{{ end }}

{{ if .IsPage }}
    {{ range .Site.Authors }}
        {{ with .Social.facebook }}
            <meta property="article:author" content="https://www.facebook.com/{{ . }}" />
        {{ end }}
        {{ with .Site.Social.facebook }}
            <meta property="article:publisher" content="https://www.facebook.com/{{ . }}" />
        {{ end }}
        <meta property="article:section" content="{{ .Section }}" />
        {{ with .Params.tags }}
            {{ range first 6 . }}
                <meta property="article:tag" content="{{ . }}" />
            {{ end }}
        {{ end }}
    {{ end }}
{{ end }}
<!-- Facebook Page Admin ID for Domain Insights -->
{{ with .Site.Social.facebook_admin }}
    <meta property="fb:admins" content="{{ . }}" />
{{ end }}
