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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2021 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.RelMe,
  11       Pleroma.Web.Metadata.Providers.RestrictIndexing
  12       | activated_providers()
  13     ]
  14
  15     Enum.reduce(providers, "", fn parser, acc ->
  16       rendered_html =
  17         params
  18         |> parser.build_tags()
  19         |> Enum.map(&to_tag/1)
  20         |> Enum.map(&HTML.safe_to_string/1)
  21         |> Enum.join()
  22
  23       acc <> rendered_html
  24     end)
  25   end
  26
  27   def to_tag(data) do
  28     with {name, attrs, _content = []} <- data do
  29       HTML.Tag.tag(name, attrs)
  30     else
  31       {name, attrs, content} ->
  32         HTML.Tag.content_tag(name, content, attrs)
  33
  34       _ ->
  35         raise ArgumentError, message: "make_tag invalid args"
  36     end
  37   end
  38
  39   def activity_nsfw?(%{data: %{"sensitive" => sensitive}}) do
  40     Pleroma.Config.get([__MODULE__, :unfurl_nsfw], false) == false and sensitive
  41   end
  42
  43   def activity_nsfw?(_) do
  44     false
  45   end
  46
  47   defp activated_providers do
  48     unless Pleroma.Config.restrict_unauthenticated_access?(:activities, :local) do
  49       [Pleroma.Web.Metadata.Providers.Feed | Pleroma.Config.get([__MODULE__, :providers], [])]
  50     else
  51       []
  52     end
  53   end
  54 end