Hugo-theme-stack/layouts/partials/head/opengraph/provider/base.html

<meta property='og:title' content='{{ partial "data/title" . }}'>
<meta property='og:description' content='{{ chomp (partial "data/description" . | plainify ) }}'>
<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 -}}
'>

{{- with .Params.locale -}}
  	<meta property='og:locale' content='{{ . }}'>
{{- end -}}

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