129 lines
3.5 KiB
Elixir
129 lines
3.5 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.ActivityPub.MRF.KeywordPolicy do
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require Pleroma.Constants
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@moduledoc "Reject or Word-Replace messages with a keyword or regex"
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@behaviour Pleroma.Web.ActivityPub.MRF
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defp string_matches?(string, _) when not is_binary(string) do
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false
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end
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defp string_matches?(string, pattern) when is_binary(pattern) do
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String.contains?(string, pattern)
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end
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defp string_matches?(string, pattern) do
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String.match?(string, pattern)
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end
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defp object_payload(%{} = object) do
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[object["content"], object["summary"], object["name"]]
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|> Enum.filter(& &1)
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|> Enum.join("\n")
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end
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defp check_reject(%{"object" => %{} = object} = message) do
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payload = object_payload(object)
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if Enum.any?(Pleroma.Config.get([:mrf_keyword, :reject]), fn pattern ->
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string_matches?(payload, pattern)
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end) do
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{:reject, "[KeywordPolicy] Matches with rejected keyword"}
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else
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{:ok, message}
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end
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end
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defp check_ftl_removal(%{"to" => to, "object" => %{} = object} = message) do
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payload = object_payload(object)
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if Pleroma.Constants.as_public() in to and
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Enum.any?(Pleroma.Config.get([:mrf_keyword, :federated_timeline_removal]), fn pattern ->
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string_matches?(payload, pattern)
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end) do
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to = List.delete(to, Pleroma.Constants.as_public())
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cc = [Pleroma.Constants.as_public() | message["cc"] || []]
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message =
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message
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|> Map.put("to", to)
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|> Map.put("cc", cc)
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{:ok, message}
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else
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{:ok, message}
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end
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end
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defp check_replace(%{"object" => %{} = object} = message) do
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object =
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["content", "name", "summary"]
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|> Enum.filter(fn field -> Map.has_key?(object, field) && object[field] end)
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|> Enum.reduce(object, fn field, object ->
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data =
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Enum.reduce(
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Pleroma.Config.get([:mrf_keyword, :replace]),
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object[field],
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fn {pat, repl}, acc -> String.replace(acc, pat, repl) end
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)
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Map.put(object, field, data)
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end)
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message = Map.put(message, "object", object)
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{:ok, message}
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end
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@impl true
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def filter(%{"type" => "Create", "object" => %{"content" => _content}} = message) do
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with {:ok, message} <- check_reject(message),
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{:ok, message} <- check_ftl_removal(message),
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{:ok, message} <- check_replace(message) do
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{:ok, message}
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else
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{:reject, nil} -> {:reject, "[KeywordPolicy] "}
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{:reject, _} = e -> e
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_e -> {:reject, "[KeywordPolicy] "}
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end
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end
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@impl true
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def filter(message), do: {:ok, message}
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@impl true
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def describe do
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# This horror is needed to convert regex sigils to strings
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mrf_keyword =
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Pleroma.Config.get(:mrf_keyword, [])
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|> Enum.map(fn {key, value} ->
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{key,
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Enum.map(value, fn
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{pattern, replacement} ->
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%{
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"pattern" =>
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if not is_binary(pattern) do
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inspect(pattern)
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else
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pattern
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end,
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"replacement" => replacement
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}
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pattern ->
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if not is_binary(pattern) do
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inspect(pattern)
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else
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pattern
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end
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end)}
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end)
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|> Enum.into(%{})
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{:ok, %{mrf_keyword: mrf_keyword}}
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end
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end
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