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<!-- http://ogp.me/ -->
<!-- https://developers.facebook.com/docs/sharing/webmasters -->
<!-- https://developers.google.com/web/fundamentals/discovery/social-discovery/ -->
<!-- https://stackoverflow.com/a/29831974 -->
<!-- https://github.com/gohugoio/hugo/blob/master/tpl/tplimpl/embedded/templates/opengraph.html -->
{{- $Deliver := .Deliver -}}
{{- $description := .description -}}
{{- $keywords := .keywords -}}
<!-- Title -->
{{- partial "components/title.html" $Deliver -}}
{{- $rawTitle := $Deliver.Scratch.Get "rawTitle" -}}
<!-- Auto Detect Images -->
{{- if $Deliver.Site.Params.autoDetectImages -}}
{{- partial "components/auto-detect-images.html" $Deliver -}}
{{- end -}}
{{- $imgsURL := ($Deliver.Scratch.Get "imgsURL") -}}
<!-- Image absURL -->
{{ with $Deliver.Params.images | default $imgsURL -}}
{{- $Deliver.Scratch.Delete "image" -}}
{{- range . -}}
{{- $image := . | absURL | safeHTML -}}
{{- $Deliver.Scratch.Add "image" (printf "%s, " $image) -}}
{{- end -}}
{{ end }}
{{- $image := (split (strings.TrimSuffix ", " ($Deliver.Scratch.Get "image")) ", ") -}}
<!-- Date -->
{{- partial "components/date.html" $Deliver -}}
{{- $pubDate := ($Deliver.Scratch.Get "pubDate") -}}
{{- $modDate := ($Deliver.Scratch.Get "modDate") -}}
<!-- Author -->
{{- partial "components/author.html" $Deliver -}}
{{- $author := ($Deliver.Scratch.Get "author") -}}
<!-- languageCode -->
{{- if $Deliver.Site.IsMultiLingual -}}
{{- $languageCode := readFile "config.toml" | findRE `languageCode = "([^"]+)` -}}
{{- with $languageCode -}}
{{- $Deliver.Scratch.Delete "languageCode" -}}
{{- range . -}}
{{- $languageCode := replaceRE `languageCode = "([^"]+)` `$1` . -}}
{{- $Deliver.Scratch.Add "languageCode" (slice $languageCode) -}}
{{- end -}}
{{- end -}}
{{- end -}}
{{- $languageCode := $Deliver.Scratch.Get "languageCode" -}}
<meta property="og:title" content="{{ $rawTitle }}" />
<meta property="og:description" content="{{ $description }}" />
<meta property="og:url" content="{{ $Deliver.Permalink }}" />
<meta property="og:site_name" content="{{ $Deliver.Site.Title }}" />
<meta property="og:locale" content="{{ $Deliver.Site.LanguageCode }}" />
{{- if $Deliver.Site.IsMultiLingual -}}
{{- range $languageCode -}}
{{ if ne . $Deliver.Site.LanguageCode }}
<meta property="og:locale:alternate" content="{{ . }}" />
{{ end }}
{{- end -}}
{{- end -}}
{{- with $imgsURL -}}
<meta property="og:image" content="{{ index $image 0 }}" />
{{ else -}}
{{ with $Deliver.Site.Params.siteLogo -}}
<meta property="og:image" content="{{ . | absURL }}" />
{{ end -}}
{{- end -}}
{{- if and $Deliver.IsPage (in $Deliver.Site.Params.mainSections $Deliver.Section) -}}
<meta property="og:type" content="article" />
{{ printf `<meta property="article:published_time" content="%s" />` $pubDate | safeHTML }}
{{ printf `<meta property="article:modified_time" content="%s" />` $modDate | safeHTML }}
{{ if not $Deliver.ExpiryDate.IsZero -}}
{{ printf `<meta property="article:expiration_time" content="%s" />` ($Deliver.ExpiryDate.Format "2006-01-02T15:04:05-07:00") | safeHTML }}
{{- end }}
<meta property="article:section" content="{{ $Deliver.Section }}" />
<meta property="article:tag" content="{{ $keywords }}" />
{{ else -}}
<meta property="og:type" content="website" />
{{- end }}
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