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# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.ActivityPub.MRF.HashtagPolicy do
require Pleroma.Constants
alias Pleroma.Config
alias Pleroma.Object
@moduledoc """
Reject, TWKN-remove or Set-Sensitive messsages with specific hashtags (without the leading #)
Note: This MRF Policy is always enabled, if you want to disable it you have to set empty lists.
"""
@behaviour Pleroma.Web.ActivityPub.MRF.Policy
@impl true
def history_awareness, do: :manual
defp check_reject(message, hashtags) do
if Enum.any?(Config.get([:mrf_hashtag, :reject]), fn match -> match in hashtags end) do
{:reject, "[HashtagPolicy] Matches with rejected keyword"}
else
{:ok, message}
end
end
defp check_ftl_removal(%{"to" => to} = message, hashtags) do
if Pleroma.Constants.as_public() in to and
Enum.any?(Config.get([:mrf_hashtag, :federated_timeline_removal]), fn match ->
match in hashtags
end) do
to = List.delete(to, Pleroma.Constants.as_public())
cc = [Pleroma.Constants.as_public() | message["cc"] || []]
message =
message
|> Map.put("to", to)
|> Map.put("cc", cc)
|> Kernel.put_in(["object", "to"], to)
|> Kernel.put_in(["object", "cc"], cc)
{:ok, message}
else
{:ok, message}
end
end
defp check_ftl_removal(message, _hashtags), do: {:ok, message}
defp check_sensitive(message) do
{:ok, new_object} =
Object.Updater.do_with_history(message["object"], fn object ->
hashtags = Object.hashtags(%Object{data: object})
if Enum.any?(Config.get([:mrf_hashtag, :sensitive]), fn match -> match in hashtags end) do
{:ok, Map.put(object, "sensitive", true)}
else
{:ok, object}
end
end)
{:ok, Map.put(message, "object", new_object)}
end
@impl true
def filter(%{"type" => type, "object" => object} = message) when type in ["Create", "Update"] do
history_items =
with %{"formerRepresentations" => %{"orderedItems" => items}} <- object do
items
else
_ -> []
end
historical_hashtags =
Enum.reduce(history_items, [], fn item, acc ->
acc ++ Object.hashtags(%Object{data: item})
end)
hashtags = Object.hashtags(%Object{data: object}) ++ historical_hashtags
if hashtags != [] do
with {:ok, message} <- check_reject(message, hashtags),
{:ok, message} <-
(if "type" == "Create" do
check_ftl_removal(message, hashtags)
else
{:ok, message}
end),
{:ok, message} <- check_sensitive(message) do
{:ok, message}
end
else
{:ok, message}
end
end
@impl true
def filter(message), do: {:ok, message}
@impl true
def describe do
mrf_hashtag =
Config.get(:mrf_hashtag)
|> Enum.into(%{})
{:ok, %{mrf_hashtag: mrf_hashtag}}
end
@impl true
def config_description do
%{
key: :mrf_hashtag,
related_policy: "Pleroma.Web.ActivityPub.MRF.HashtagPolicy",
label: "MRF Hashtag",
description: @moduledoc,
children: [
%{
key: :reject,
type: {:list, :string},
description: "A list of hashtags which result in message being rejected.",
suggestions: ["foo"]
},
%{
key: :federated_timeline_removal,
type: {:list, :string},
description:
"A list of hashtags which result in message being removed from federated timelines (a.k.a unlisted).",
suggestions: ["foo"]
},
%{
key: :sensitive,
type: {:list, :string},
description:
"A list of hashtags which result in message being set as sensitive (a.k.a NSFW/R-18)",
suggestions: ["nsfw", "r18"]
}
]
}
end
end

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