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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.ActivityPub.MRF.RejectNonPublic do
   6   alias Pleroma.User
   7   @moduledoc "Rejects non-public (followers-only, direct) activities"
   8   @behaviour Pleroma.Web.ActivityPub.MRF
   9
  10   @impl true
  11   def filter(%{"type" => "Create"} = object) do
  12     user = User.get_cached_by_ap_id(object["actor"])
  13     public = "https://www.w3.org/ns/activitystreams#Public"
  14
  15     # Determine visibility
  16     visibility =
  17       cond do
  18         public in object["to"] -> "public"
  19         public in object["cc"] -> "unlisted"
  20         user.follower_address in object["to"] -> "followers"
  21         true -> "direct"
  22       end
  23
  24     policy = Pleroma.Config.get(:mrf_rejectnonpublic)
  25
  26     case visibility do
  27       "public" ->
  28         {:ok, object}
  29
  30       "unlisted" ->
  31         {:ok, object}
  32
  33       "followers" ->
  34         with true <- Keyword.get(policy, :allow_followersonly) do
  35           {:ok, object}
  36         else
  37           _e -> {:reject, nil}
  38         end
  39
  40       "direct" ->
  41         with true <- Keyword.get(policy, :allow_direct) do
  42           {:ok, object}
  43         else
  44           _e -> {:reject, nil}
  45         end
  46     end
  47   end
  48
  49   @impl true
  50   def filter(object), do: {:ok, object}
  51 end