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furlex

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Furlex is a structured data extraction tool written in Elixir. It currently supports unfurling oEmbed, Twitter Card, Facebook Open Graph, JSON-LD and plain ole' HTML `<meta />` data out of any url you supply.

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furlex lib furlex parser facebook.ex
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lib/furlex/parser/facebook.ex 

defmodule Furlex.Parser.Facebook do

  @behaviour Furlex.Parser



  alias Furlex.Parser



  @tags ~w(

    fb:app_id fb:pages



    og:url og:title og:description og:image og:type og:locale og:video

    og:video:url og:video:secure_url og:video:type og:video:width

    og:video:height og:image:url og:image:secure_url og:image:type

    og:image:width og:image:height og:audio og:determiner og:locale:alternate

    og:site_name og:image:alt



    article:published_time article:modified_time

    article:expiration_time article:author article:section article:tag



    book:author book:isbn book:release_date book:tag



    profile:first_name profile:last_name profile:username profile:gender



    music:duration music:album music:album:disc music:album:track

    music:musician music:song music:song:disc music:song:track

    music:release_date music:creator



    video:actor video:actor:role video:director video:duration

    video:release_date video:tag video:writer video:series

  )



  @spec parse(String.t) :: {:ok, Map.t}

  def parse(html) do

    meta = &("meta[property=\"#{&1}\"]")

    map  = Parser.extract tags(), html, meta



    {:ok, map}

  end



  def tags do

    (config(:tags) || [])

    |> Enum.concat(@tags)

    |> Enum.uniq()

  end



  defp config(key), do: Application.get_env(:furlex, __MODULE__)[key]

end