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   1 # Pleroma: A lightweight social networking server
   2 # Copyright _ 2017-2019 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Web.RichMedia.Helpers do
   6   alias Pleroma.Activity
   7   alias Pleroma.Object
   8   alias Pleroma.HTML
   9   alias Pleroma.Web.RichMedia.Parser
  10
  11   defp validate_page_url(nil), do: :error
  12   defp validate_page_url(%URI{authority: nil}), do: :error
  13   defp validate_page_url(%URI{scheme: nil}), do: :error
  14   defp validate_page_url(%URI{}), do: :ok
  15   defp validate_page_url(page_url), do: URI.parse(page_url) |> validate_page_url
  16
  17   def fetch_data_for_activity(%Activity{} = activity) do
  18     with true <- Pleroma.Config.get([:rich_media, :enabled]),
  19          %Object{} = object <- Object.normalize(activity.data["object"]),
  20          {:ok, page_url} <- HTML.extract_first_external_url(object, object.data["content"]),
  21          :ok <- validate_page_url(page_url),
  22          {:ok, rich_media} <- Parser.parse(page_url) do
  23       %{page_url: page_url, rich_media: rich_media}
  24     else
  25       _ -> %{}
  26     end
  27   end
  28 end