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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
-
- 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, hashtags) do
- if Enum.any?(Config.get([:mrf_hashtag, :sensitive]), fn match -> match in hashtags end) do
- {:ok, Kernel.put_in(message, ["object", "sensitive"], true)}
- else
- {:ok, message}
- end
- end
-
- @impl true
- def filter(%{"type" => "Create", "object" => object} = message) do
- hashtags = Object.hashtags(%Object{data: object})
-
- if hashtags != [] do
- with {:ok, message} <- check_reject(message, hashtags),
- {:ok, message} <- check_ftl_removal(message, hashtags),
- {:ok, message} <- check_sensitive(message, hashtags) 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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