1 # Pleroma: A lightweight social networking server
2 # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
3 # SPDX-License-Identifier: AGPL-3.0-only
5 defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
6 @moduledoc "Filter activities depending on their origin instance"
7 @behaviour Pleroma.Web.ActivityPub.MRF
11 alias Pleroma.Web.ActivityPub.MRF
13 require Pleroma.Constants
15 defp check_accept(%{host: actor_host} = _actor_info, object) do
17 Config.get([:mrf_simple, :accept])
18 |> MRF.subdomains_regex()
21 accepts == [] -> {:ok, object}
22 actor_host == Config.get([Pleroma.Web.Endpoint, :url, :host]) -> {:ok, object}
23 MRF.subdomain_match?(accepts, actor_host) -> {:ok, object}
24 true -> {:reject, nil}
28 defp check_reject(%{host: actor_host} = _actor_info, object) do
30 Config.get([:mrf_simple, :reject])
31 |> MRF.subdomains_regex()
33 if MRF.subdomain_match?(rejects, actor_host) do
40 defp check_media_removal(
41 %{host: actor_host} = _actor_info,
42 %{"type" => "Create", "object" => %{"attachment" => child_attachment}} = object
44 when length(child_attachment) > 0 do
46 Config.get([:mrf_simple, :media_removal])
47 |> MRF.subdomains_regex()
50 if MRF.subdomain_match?(media_removal, actor_host) do
51 child_object = Map.delete(object["object"], "attachment")
52 Map.put(object, "object", child_object)
60 defp check_media_removal(_actor_info, object), do: {:ok, object}
62 defp check_media_nsfw(
63 %{host: actor_host} = _actor_info,
66 "object" => child_object
70 Config.get([:mrf_simple, :media_nsfw])
71 |> MRF.subdomains_regex()
74 if MRF.subdomain_match?(media_nsfw, actor_host) do
75 tags = (child_object["tag"] || []) ++ ["nsfw"]
76 child_object = Map.put(child_object, "tag", tags)
77 child_object = Map.put(child_object, "sensitive", true)
78 Map.put(object, "object", child_object)
86 defp check_media_nsfw(_actor_info, object), do: {:ok, object}
88 defp check_ftl_removal(%{host: actor_host} = _actor_info, object) do
90 Config.get([:mrf_simple, :federated_timeline_removal])
91 |> MRF.subdomains_regex()
94 with true <- MRF.subdomain_match?(timeline_removal, actor_host),
95 user <- User.get_cached_by_ap_id(object["actor"]),
96 true <- Pleroma.Constants.as_public() in object["to"] do
97 to = List.delete(object["to"], Pleroma.Constants.as_public()) ++ [user.follower_address]
99 cc = List.delete(object["cc"], user.follower_address) ++ [Pleroma.Constants.as_public()]
111 defp check_report_removal(%{host: actor_host} = _actor_info, %{"type" => "Flag"} = object) do
113 Config.get([:mrf_simple, :report_removal])
114 |> MRF.subdomains_regex()
116 if MRF.subdomain_match?(report_removal, actor_host) do
123 defp check_report_removal(_actor_info, object), do: {:ok, object}
125 defp check_avatar_removal(%{host: actor_host} = _actor_info, %{"icon" => _icon} = object) do
127 Config.get([:mrf_simple, :avatar_removal])
128 |> MRF.subdomains_regex()
130 if MRF.subdomain_match?(avatar_removal, actor_host) do
131 {:ok, Map.delete(object, "icon")}
137 defp check_avatar_removal(_actor_info, object), do: {:ok, object}
139 defp check_banner_removal(%{host: actor_host} = _actor_info, %{"image" => _image} = object) do
141 Config.get([:mrf_simple, :banner_removal])
142 |> MRF.subdomains_regex()
144 if MRF.subdomain_match?(banner_removal, actor_host) do
145 {:ok, Map.delete(object, "image")}
151 defp check_banner_removal(_actor_info, object), do: {:ok, object}
154 def filter(%{"type" => "Delete", "actor" => actor} = object) do
155 %{host: actor_host} = URI.parse(actor)
158 Pleroma.Config.get([:mrf_simple, :reject_deletes])
159 |> MRF.subdomains_regex()
161 if MRF.subdomain_match?(reject_deletes, actor_host) do
169 def filter(%{"actor" => actor} = object) do
170 actor_info = URI.parse(actor)
172 with {:ok, object} <- check_accept(actor_info, object),
173 {:ok, object} <- check_reject(actor_info, object),
174 {:ok, object} <- check_media_removal(actor_info, object),
175 {:ok, object} <- check_media_nsfw(actor_info, object),
176 {:ok, object} <- check_ftl_removal(actor_info, object),
177 {:ok, object} <- check_report_removal(actor_info, object) do
184 def filter(%{"id" => actor, "type" => obj_type} = object)
185 when obj_type in ["Application", "Group", "Organization", "Person", "Service"] do
186 actor_info = URI.parse(actor)
188 with {:ok, object} <- check_accept(actor_info, object),
189 {:ok, object} <- check_reject(actor_info, object),
190 {:ok, object} <- check_avatar_removal(actor_info, object),
191 {:ok, object} <- check_banner_removal(actor_info, object) do
198 def filter(object), do: {:ok, object}
202 exclusions = Config.get([:mrf, :transparency_exclusions])
205 Config.get(:mrf_simple)
206 |> Enum.map(fn {k, v} -> {k, Enum.reject(v, fn v -> v in exclusions end)} end)
209 {:ok, %{mrf_simple: mrf_simple}}