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