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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Web.RichMedia.Parsers.OEmbed do
   6   def parse(html, _data) do
   7     with elements = [_ | _] <- get_discovery_data(html),
   8          {:ok, oembed_url} <- get_oembed_url(elements),
   9          {:ok, oembed_data} <- get_oembed_data(oembed_url) do
  10       oembed_data
  11     else
  12       _e -> %{}
  13     end
  14   end
  15
  16   defp get_discovery_data(html) do
  17     html |> Floki.find("link[type='application/json+oembed']")
  18   end
  19
  20   defp get_oembed_url(nodes) do
  21     {"link", attributes, _children} = nodes |> hd()
  22
  23     {:ok, Enum.into(attributes, %{})["href"]}
  24   end
  25
  26   defp get_oembed_data(url) do
  27     {:ok, %Tesla.Env{body: json}} = Pleroma.HTTP.get(url, [], adapter: [pool: :media])
  28
  29     {:ok, data} = Jason.decode(json)
  30
  31     data = data |> Map.new(fn {k, v} -> {String.to_atom(k), v} end)
  32
  33     {:ok, data}
  34   end
  35 end