{{ "<!-- title -->" | safeHTML }}
<title itemprop="name">{{ .Title }} • {{ .Site.Title }}</title>
<meta property="og:title" content="{{ .Title }}" />
<meta name="twitter:title" content="{{ .Title }}" />
<meta name="application-name" content="{{ .Site.Title }}" />
<meta property="og:site_name" content="{{ .Site.Title }}" />

{{- with or .Description .Summary .Site.Params.description }}
{{ "<!-- description -->" | safeHTML }}
<meta name="description" content="{{.}}">
<meta itemprop="description" content="{{.}}" />
<meta property="og:description" content="{{.}}" />
<meta name="twitter:description" content="{{.}}" />
{{ end -}}
{{ "<!-- url -->" | safeHTML }}
<base href="{{ .Permalink | absURL }}">
<link rel="canonical" href="{{ .Permalink | absURL }}" itemprop="url" />
<meta name="url" content="{{ .Permalink | absURL }}" />
<meta name="twitter:url" content="{{ .Permalink | absURL }}" /> 
<meta property="og:url" content="{{ .Permalink | absURL }}" />

{{- $cover := ($.Resources.ByType "image").GetMatch "{*cover*,*thumbnail*,*featured*}" -}}
{{ $icon := resources.GetMatch (default "" .Site.Params.icon) -}}
{{- $staticIcon := "icon.png" | absURL -}}
{{- with or .Params.cover $cover $icon }}
{{ "<!-- image -->" | safeHTML }}
<meta itemprop="image" content='{{ .Permalink | absURL }}' />
<meta property="og:image" content='{{ .Permalink | absURL }}' />
{{- with .Width }}
<meta property="og:image:width" content='{{ . }}' />
{{- end }}
{{- with .Height }}
<meta property="og:image:height" content='{{ . }}' />
{{- end }}
<meta name="twitter:image" content='{{ .Permalink | absURL }}' />
<meta name="twitter:image:src" content='{{ .Permalink | absURL }}' />
{{- else }}{{/* no image found */}}
{{ "<!-- image -->" | safeHTML }}
<meta itemprop="image" content='{{ $staticIcon }}' />
<meta property="og:image" content='{{ $staticIcon }}' />
<meta name="twitter:image" content='{{ $staticIcon }}' />
<meta name="twitter:image:src" content='{{ $staticIcon }}' />
{{- end -}}

{{/*=== author ===*/}}
{{ with or .Params.author .Site.Params.author -}}
{{ "<!-- author -->" | safeHTML }}
<meta property="article:publisher" content="{{ . }}" />
<meta property="og:article:author" content="{{ . }}" />
<meta property="article:author" content="{{ . }}" /> 
<meta name="author" content="{{ . }}" />
{{- end -}}

{{/*=== published and updated ===*/}}
{{ "<!-- time -->" | safeHTML }}
{{- with .Date }}
<meta property="og:article:published_time" content={{ .Format "2006-01-02T15:04:05Z0700" | safeHTML }} /> 
<meta property="article:published_time" content={{ .Format "2006-01-02T15:04:05Z0700" | safeHTML }} />
{{ end -}}
{{ with .Lastmod -}}
<meta property="og:updated_time" content={{ .Format "2006-01-02T15:04:05Z0700" | safeHTML }} />
{{ end -}}

{{/*=== section and keywords ===*/}}
{{- with.Params.category -}}
<meta name="news_keywords" content="{{ . }}" />
<meta property="article:section" content="{{ . }}" />
{{- end -}}
{{- with .Params.tags }}
<meta name="keywords" content='{{ delimit . " "}}'>
{{- end -}}

{{- if isset .Params "date" -}}
{{ "<!-- article metadata -->" | safeHTML }}
<meta property="og:type" content="article" />
<script defer type="application/ld+json">
	{
		"@context": "http://schema.org",
		"@type": "Article",
		"headline": {{ .Title }},
		"author": {
			"@type": "Person",
			"name": "{{ or .Params.author .Site.Params.author }}"
		},
		"datePublished": "{{ .Date.Format "2006-01-02" }}",
		"description": {{ or .Description .Summary }},
		"wordCount": {{ .WordCount }},
		"mainEntityOfPage": "True",
		"dateModified": "{{ .Lastmod.Format "2006-01-02" }}",
		"image": {
			"@type": "imageObject",
			"url": "{{ with or .Params.cover $cover $icon }}{{ .Permalink | absURL }}{{ end }}"
		},
		"publisher": {
			"@type": "Person",
			"name": "{{ or .Params.author .Site.Params.author .Site.Title }}",
			"logo": {
			"@type": "imageObject",
			"url": {{with $icon}}{{.Permalink}}{{else}}{{$staticIcon}}{{end}}
			}
		}
	}
</script>
{{- else -}}
{{ "<!-- webpage metadata -->" | safeHTML }}
<meta property="og:type" content="website" />
<script defer type="application/ld+json">
	{ 
		"@context": "http://schema.org", 
		"@type": "WebSite", 
		"url": {{ .Permalink }}, 
		"name": "{{ .Site.Title }}", 
		"logo": {{with $icon}}{{.Permalink}}{{else}}{{$staticIcon}}{{end}}
	}
</script>
{{- end -}}

{{/* auxiliary info */}}
{{ "<!-- site presentation -->" | safeHTML }}
{{- with $icon }}
<link rel="shortcut icon" href='{{ .Permalink }}' sizes="{{.Width}}x{{.Height}}">
{{- else }}
<link rel="shortcut icon" href='{{ $staticIcon }}' sizes="512x512">
{{- end }}
<meta name="theme-color" content="#ffffff" />
<meta name="msapplication-TileColor" content="#ffffff" />
<link rel="sitemap" type="application/xml" title="Sitemap" href="{{ .Site.BaseURL }}sitemap.xml" /> 
{{ with .OutputFormats.Get "RSS" -}}
<link href="{{ .Permalink }}" rel="feed alternate" type="application/rss+xml" title="{{ $.Site.Title }}" />
{{- end }}
<meta name="robots" content="index,follow" />
<meta name="googlebot" content="index,follow" />