{{ $img := print .Permalink "img/featured.png" }}

{{ if not (fileExists (print .RelPermalink "img/featured.png")) }}
    {{ $img = "/img/covers/default-cover.png" }}
{{ end }} 


{{ if .Params.featured_img }}
  {{ $img = print .Permalink .Params.featured_img }}
{{ end }}

<link rel="canonical" href="{{ .Permalink }}" />

<meta property="og:title" content="{{ .Title }}" />
<meta property="og:type" content="article" />
<meta property="og:url" content="{{ .Permalink }}" />
<meta property="og:image" content="{{ $img }}" />
<meta property="og:description" content="{{ .Description }}" />

<meta name="twitter:card" content="summary" />
<meta name="twitter:site" content="@angularfirebase">
<meta name="twitter:title" content="{{ .Title }}">
<meta name="twitter:description" content="{{ .Description }}">
<meta name="twitter:image" content="{{ $img }}">