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
10 alias Pleroma.FollowingRelationship
12 alias Pleroma.Web.ActivityPub.MRF
14 require Pleroma.Constants
16 defp check_accept(%{host: actor_host} = _actor_info, object) do
18 Config.get([:mrf_simple, :accept])
19 |> MRF.subdomains_regex()
22 accepts == [] -> {:ok, object}
23 actor_host == Config.get([Pleroma.Web.Endpoint, :url, :host]) -> {:ok, object}
24 MRF.subdomain_match?(accepts, actor_host) -> {:ok, object}
25 true -> {:reject, "[SimplePolicy] host not in accept list"}
29 defp check_reject(%{host: actor_host} = _actor_info, object) do
31 Config.get([:mrf_simple, :reject])
32 |> MRF.subdomains_regex()
34 if MRF.subdomain_match?(rejects, actor_host) do
35 {:reject, "[SimplePolicy] host in reject list"}
41 defp check_media_removal(
42 %{host: actor_host} = _actor_info,
43 %{"type" => "Create", "object" => %{"attachment" => child_attachment}} = object
45 when length(child_attachment) > 0 do
47 Config.get([:mrf_simple, :media_removal])
48 |> MRF.subdomains_regex()
51 if MRF.subdomain_match?(media_removal, actor_host) do
52 child_object = Map.delete(object["object"], "attachment")
53 Map.put(object, "object", child_object)
61 defp check_media_removal(_actor_info, object), do: {:ok, object}
63 defp check_media_nsfw(
64 %{host: actor_host} = _actor_info,
67 "object" => child_object
71 Config.get([:mrf_simple, :media_nsfw])
72 |> MRF.subdomains_regex()
75 if MRF.subdomain_match?(media_nsfw, actor_host) do
76 tags = (child_object["tag"] || []) ++ ["nsfw"]
77 child_object = Map.put(child_object, "tag", tags)
78 child_object = Map.put(child_object, "sensitive", true)
79 Map.put(object, "object", child_object)
87 defp check_media_nsfw(_actor_info, object), do: {:ok, object}
89 defp check_ftl_removal(%{host: actor_host} = _actor_info, object) do
91 Config.get([:mrf_simple, :federated_timeline_removal])
92 |> MRF.subdomains_regex()
95 with true <- MRF.subdomain_match?(timeline_removal, actor_host),
96 user <- User.get_cached_by_ap_id(object["actor"]),
97 true <- Pleroma.Constants.as_public() in object["to"] do
98 to = List.delete(object["to"], Pleroma.Constants.as_public()) ++ [user.follower_address]
100 cc = List.delete(object["cc"], user.follower_address) ++ [Pleroma.Constants.as_public()]
112 defp intersection(list1, list2) do
113 list1 -- list1 -- list2
116 defp check_followers_only(%{host: actor_host} = _actor_info, object) do
118 Config.get([:mrf_simple, :followers_only])
119 |> MRF.subdomains_regex()
122 with true <- MRF.subdomain_match?(followers_only, actor_host),
123 user <- User.get_cached_by_ap_id(object["actor"]) do
124 # Don't use Map.get/3 intentionally, these must not be nil
125 fixed_to = object["to"] || []
126 fixed_cc = object["cc"] || []
128 to = FollowingRelationship.followers_ap_ids(user, fixed_to)
129 cc = FollowingRelationship.followers_ap_ids(user, fixed_cc)
132 |> Map.put("to", intersection([user.follower_address | to], fixed_to))
133 |> Map.put("cc", intersection([user.follower_address | cc], fixed_cc))
141 defp check_report_removal(%{host: actor_host} = _actor_info, %{"type" => "Flag"} = object) do
143 Config.get([:mrf_simple, :report_removal])
144 |> MRF.subdomains_regex()
146 if MRF.subdomain_match?(report_removal, actor_host) do
147 {:reject, "[SimplePolicy] host in report_removal list"}
153 defp check_report_removal(_actor_info, object), do: {:ok, object}
155 defp check_avatar_removal(%{host: actor_host} = _actor_info, %{"icon" => _icon} = object) do
157 Config.get([:mrf_simple, :avatar_removal])
158 |> MRF.subdomains_regex()
160 if MRF.subdomain_match?(avatar_removal, actor_host) do
161 {:ok, Map.delete(object, "icon")}
167 defp check_avatar_removal(_actor_info, object), do: {:ok, object}
169 defp check_banner_removal(%{host: actor_host} = _actor_info, %{"image" => _image} = object) do
171 Config.get([:mrf_simple, :banner_removal])
172 |> MRF.subdomains_regex()
174 if MRF.subdomain_match?(banner_removal, actor_host) do
175 {:ok, Map.delete(object, "image")}
181 defp check_banner_removal(_actor_info, object), do: {:ok, object}
184 def filter(%{"type" => "Delete", "actor" => actor} = object) do
185 %{host: actor_host} = URI.parse(actor)
188 Config.get([:mrf_simple, :reject_deletes])
189 |> MRF.subdomains_regex()
191 if MRF.subdomain_match?(reject_deletes, actor_host) do
192 {:reject, "[SimplePolicy] host in reject_deletes list"}
199 def filter(%{"actor" => actor} = object) do
200 actor_info = URI.parse(actor)
202 with {:ok, object} <- check_accept(actor_info, object),
203 {:ok, object} <- check_reject(actor_info, object),
204 {:ok, object} <- check_media_removal(actor_info, object),
205 {:ok, object} <- check_media_nsfw(actor_info, object),
206 {:ok, object} <- check_ftl_removal(actor_info, object),
207 {:ok, object} <- check_followers_only(actor_info, object),
208 {:ok, object} <- check_report_removal(actor_info, object) do
211 {:reject, nil} -> {:reject, "[SimplePolicy]"}
212 {:reject, _} = e -> e
213 _ -> {:reject, "[SimplePolicy]"}
217 def filter(%{"id" => actor, "type" => obj_type} = object)
218 when obj_type in ["Application", "Group", "Organization", "Person", "Service"] do
219 actor_info = URI.parse(actor)
221 with {:ok, object} <- check_accept(actor_info, object),
222 {:ok, object} <- check_reject(actor_info, object),
223 {:ok, object} <- check_avatar_removal(actor_info, object),
224 {:ok, object} <- check_banner_removal(actor_info, object) do
227 {:reject, nil} -> {:reject, "[SimplePolicy]"}
228 {:reject, _} = e -> e
229 _ -> {:reject, "[SimplePolicy]"}
233 def filter(object), do: {:ok, object}
237 exclusions = Config.get([:mrf, :transparency_exclusions])
240 Config.get(:mrf_simple)
241 |> Enum.map(fn {k, v} -> {k, Enum.reject(v, fn v -> v in exclusions end)} end)
244 {:ok, %{mrf_simple: mrf_simple}}