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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.Metadata do
   6   alias Phoenix.HTML
   7
   8   def build_tags(params) do
   9     providers = [
  10       Pleroma.Web.Metadata.Providers.Feed,
  11       Pleroma.Web.Metadata.Providers.RelMe,
  12       Pleroma.Web.Metadata.Providers.RestrictIndexing
  13       | activated_providers()
  14     ]
  15
  16     Enum.reduce(providers, "", fn parser, acc ->
  17       rendered_html =
  18         params
  19         |> parser.build_tags()
  20         |> Enum.map(&to_tag/1)
  21         |> Enum.map(&HTML.safe_to_string/1)
  22         |> Enum.join()
  23
  24       acc <> rendered_html
  25     end)
  26   end
  27
  28   def to_tag(data) do
  29     with {name, attrs, _content = []} <- data do
  30       HTML.Tag.tag(name, attrs)
  31     else
  32       {name, attrs, content} ->
  33         HTML.Tag.content_tag(name, content, attrs)
  34
  35       _ ->
  36         raise ArgumentError, message: "make_tag invalid args"
  37     end
  38   end
  39
  40   def activity_nsfw?(%{data: %{"sensitive" => sensitive}}) do
  41     Pleroma.Config.get([__MODULE__, :unfurl_nsfw], false) == false and sensitive
  42   end
  43
  44   def activity_nsfw?(_) do
  45     false
  46   end
  47
  48   defp activated_providers do
  49     if Pleroma.Config.get!([:instance, :public]) do
  50       Pleroma.Config.get([__MODULE__, :providers], [])
  51     else
  52       []
  53     end
  54   end
  55 end