Pleroma/lib/pleroma/web/activity_pub/mrf/keyword_policy.ex

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# Pleroma: A lightweight social networking server
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.ActivityPub.MRF.KeywordPolicy do
@behaviour Pleroma.Web.ActivityPub.MRF
defp string_matches?(string, pattern) when is_binary(pattern) do
String.contains?(string, pattern)
end
defp string_matches?(string, pattern) do
String.match?(string, pattern)
end
defp check_reject(%{"object" => %{"content" => content}} = message) do
if Enum.any?(Pleroma.Config.get([:mrf_keyword, :reject]), fn pattern ->
string_matches?(content, pattern)
end) do
{:reject, nil}
else
{:ok, message}
end
end
defp check_ftl_removal(%{"to" => to, "object" => %{"content" => content}} = message) do
if "https://www.w3.org/ns/activitystreams#Public" in to and
Enum.any?(Pleroma.Config.get([:mrf_keyword, :federated_timeline_removal]), fn pattern ->
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string_matches?(content, pattern)
end) do
to = List.delete(to, "https://www.w3.org/ns/activitystreams#Public")
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cc = ["https://www.w3.org/ns/activitystreams#Public" | message["cc"] || []]
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message =
message
|> Map.put("to", to)
|> Map.put("cc", cc)
{:ok, message}
else
{:ok, message}
end
end
defp check_replace(%{"object" => %{"content" => content}} = message) do
content =
Enum.reduce(Pleroma.Config.get([:mrf_keyword, :replace]), content, fn {pattern, replacement},
acc ->
String.replace(acc, pattern, replacement)
end)
{:ok, put_in(message["object"]["content"], content)}
end
@impl true
def filter(%{"object" => %{"content" => nil}} = message) do
{:ok, message}
end
@impl true
def filter(%{"type" => "Create", "object" => %{"content" => _content}} = message) do
with {:ok, message} <- check_reject(message),
{:ok, message} <- check_ftl_removal(message),
{:ok, message} <- check_replace(message) do
{:ok, message}
else
_e ->
{:reject, nil}
end
end
@impl true
def filter(message), do: {:ok, message}
end