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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.ActivityPub.MRF.RejectNonPublic do
   6   @moduledoc "Rejects non-public (followers-only, direct) activities"
   7
   8   alias Pleroma.Config
   9   alias Pleroma.User
  10
  11   @behaviour Pleroma.Web.ActivityPub.MRF
  12
  13   require Pleroma.Constants
  14
  15   @impl true
  16   def filter(%{"type" => "Create"} = object) do
  17     user = User.get_cached_by_ap_id(object["actor"])
  18
  19     # Determine visibility
  20     visibility =
  21       cond do
  22         Pleroma.Constants.as_public() in object["to"] -> "public"
  23         Pleroma.Constants.as_public() in object["cc"] -> "unlisted"
  24         user.follower_address in object["to"] -> "followers"
  25         true -> "direct"
  26       end
  27
  28     policy = Config.get(:mrf_rejectnonpublic)
  29
  30     cond do
  31       visibility in ["public", "unlisted"] ->
  32         {:ok, object}
  33
  34       visibility == "followers" and Keyword.get(policy, :allow_followersonly) ->
  35         {:ok, object}
  36
  37       visibility == "direct" and Keyword.get(policy, :allow_direct) ->
  38         {:ok, object}
  39
  40       true ->
  41         {:reject, "[RejectNonPublic] visibility: #{visibility}"}
  42     end
  43   end
  44
  45   @impl true
  46   def filter(object), do: {:ok, object}
  47
  48   @impl true
  49   def describe,
  50     do: {:ok, %{mrf_rejectnonpublic: Config.get(:mrf_rejectnonpublic) |> Enum.into(%{})}}
  51
  52   @impl true
  53   def config_description do
  54     %{
  55       key: :mrf_rejectnonpublic,
  56       related_policy: "Pleroma.Web.ActivityPub.MRF.RejectNonPublic",
  57       description: "RejectNonPublic drops posts with non-public visibility settings.",
  58       label: "MRF Reject Non Public",
  59       children: [
  60         %{
  61           key: :allow_followersonly,
  62           label: "Allow followers-only",
  63           type: :boolean,
  64           description: "Whether to allow followers-only posts"
  65         },
  66         %{
  67           key: :allow_direct,
  68           type: :boolean,
  69           description: "Whether to allow direct messages"
  70         }
  71       ]
  72     }
  73   end
  74 end