git.squeep.com Git - akkoma/blob - lib/pleroma/web/activity_pub/mrf/simple_policy.ex

   1 defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
   2   alias Pleroma.User
   3
   4   @mrf_policy Application.get_env(:pleroma, :mrf_simple)
   5
   6   @reject Keyword.get(@mrf_policy, :reject)
   7   defp check_reject(actor_info, object) do
   8     if actor_info.host in @reject do
   9       {:reject, nil}
  10     else
  11       {:ok, object}
  12     end
  13   end
  14
  15   @media_removal Keyword.get(@mrf_policy, :media_removal)
  16   defp check_media_removal(actor_info, object) do
  17     if actor_info.host in @media_removal do
  18       child_object = Map.delete(object["object"], "attachment")
  19       object = Map.put(object, "object", child_object)
  20     end
  21
  22     {:ok, object}
  23   end
  24
  25   @media_nsfw Keyword.get(@mrf_policy, :media_nsfw)
  26   defp check_media_nsfw(actor_info, object) do
  27     child_object = object["object"]
  28
  29     if actor_info.host in @media_nsfw and child_object["attachment"] != nil and
  30          length(child_object["attachment"]) > 0 do
  31       tags = (child_object["tag"] || []) ++ ["nsfw"]
  32       child_object = Map.put(child_object, "tags", tags)
  33       child_object = Map.put(child_object, "sensitive", true)
  34       object = Map.put(object, "object", child_object)
  35     end
  36
  37     {:ok, object}
  38   end
  39
  40   @ftl_removal Keyword.get(@mrf_policy, :federated_timeline_removal)
  41   defp check_ftl_removal(actor_info, object) do
  42     if actor_info.host in @ftl_removal do
  43       user = User.get_by_ap_id(object["actor"])
  44
  45       # flip to/cc relationship to make the post unlisted
  46       if "https://www.w3.org/ns/activitystreams#Public" in object["to"] and
  47            user.follower_address in object["cc"] do
  48         to =
  49           List.delete(object["to"], "https://www.w3.org/ns/activitystreams#Public") ++
  50             [user.follower_address]
  51
  52         cc =
  53           List.delete(object["cc"], user.follower_address) ++
  54             ["https://www.w3.org/ns/activitystreams#Public"]
  55
  56         object = Map.put(object, "to", to)
  57         object = Map.put(object, "cc", cc)
  58       end
  59     end
  60
  61     {:ok, object}
  62   end
  63
  64   def filter(object) do
  65     actor_info = URI.parse(object["actor"])
  66
  67     with {:ok, object} <- check_reject(actor_info, object),
  68          {:ok, object} <- check_media_removal(actor_info, object),
  69          {:ok, object} <- check_media_nsfw(actor_info, object),
  70          {:ok, object} <- check_ftl_removal(actor_info, object) do
  71       {:ok, object}
  72     else
  73       e -> {:reject, nil}
  74     end
  75   end
  76 end