{{- $title := partialCached "data/title" . .RelPermalink -}}
{{- $description := partialCached "data/description" . .RelPermalink -}}

{{/* OpenGraph protocol reference https://ogp.me/ */}}

<meta property="og:title" content="{{ $title }}">
<meta property="og:description" content="{{ $description }}">
<meta property="og:url" content="{{ .Permalink }}">
<meta property="og:site_name" content="{{ .Site.Title }}">
<meta property="og:type" content="
    {{- if .IsPage -}}
        article
    {{- else -}}
        website
    {{- end -}}
">

<meta property="og:locale" content="{{ .Site.LanguageCode }}">

{{- if .IsPage -}}
    <meta property="article:section" content="{{ .Section | title }}" />
    {{- range .Params.tags -}}
        <meta property="article:tag" content="{{ . }}" />
    {{- end -}}
{{- end -}}

{{- if .IsPage -}}
    {{- 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 .Site.LastChange.IsZero }}
<meta property="og:updated_time" content="{{- .Site.LastChange.Format "2006-01-02T15:04:05-07:00" | safeHTML -}}" />
    {{- end -}}
{{- end -}}

{{ $image := partialCached "helpers/image" (dict "Context" . "Type" "opengraph") .RelPermalink "opengraph" }}
{{ if $image.exists }}
<meta property="og:image" content="{{ absURL $image.permalink }}" />
{{- end -}}