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128 lines
3.7 KiB
Elixir
128 lines
3.7 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2021 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.HellthreadPolicy do
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alias Pleroma.User
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require Pleroma.Constants
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@moduledoc "Block messages with too much mentions (configurable)"
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@behaviour Pleroma.Web.ActivityPub.MRF.Policy
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defp delist_message(message, threshold) when threshold > 0 do
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follower_collection = User.get_cached_by_ap_id(message["actor"]).follower_address
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to = message["to"] || []
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cc = message["cc"] || []
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follower_collection? = Enum.member?(to ++ cc, follower_collection)
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message =
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case get_recipient_count(message) do
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{:public, recipients}
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when follower_collection? and recipients > threshold ->
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message
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|> Map.put("to", [follower_collection])
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|> Map.put("cc", [Pleroma.Constants.as_public()])
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{:public, recipients} when recipients > threshold ->
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message
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|> Map.put("to", [])
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|> Map.put("cc", [Pleroma.Constants.as_public()])
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_ ->
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message
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end
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{:ok, message}
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end
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defp delist_message(message, _threshold), do: {:ok, message}
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defp reject_message(message, threshold) when threshold > 0 do
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with {_, recipients} <- get_recipient_count(message) do
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if recipients > threshold do
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{:reject, "[HellthreadPolicy] #{recipients} recipients is over the limit of #{threshold}"}
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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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end
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defp reject_message(message, _threshold), do: {:ok, message}
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defp get_recipient_count(message) do
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recipients = (message["to"] || []) ++ (message["cc"] || [])
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follower_collection = User.get_cached_by_ap_id(message["actor"]).follower_address
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if Enum.member?(recipients, Pleroma.Constants.as_public()) do
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recipients =
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recipients
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|> List.delete(Pleroma.Constants.as_public())
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|> List.delete(follower_collection)
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{:public, length(recipients)}
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else
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recipients =
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recipients
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|> List.delete(follower_collection)
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{:not_public, length(recipients)}
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end
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end
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@impl true
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def filter(%{"type" => "Create", "object" => %{"type" => object_type}} = message)
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when object_type in ~w{Note Article} do
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reject_threshold =
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Pleroma.Config.get(
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[:mrf_hellthread, :reject_threshold],
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Pleroma.Config.get([:mrf_hellthread, :threshold])
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)
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delist_threshold = Pleroma.Config.get([:mrf_hellthread, :delist_threshold])
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with {:ok, message} <- reject_message(message, reject_threshold),
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{:ok, message} <- delist_message(message, delist_threshold) do
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{:ok, message}
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else
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e -> e
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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,
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do: {:ok, %{mrf_hellthread: Pleroma.Config.get(:mrf_hellthread) |> Enum.into(%{})}}
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@impl true
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def config_description do
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%{
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key: :mrf_hellthread,
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related_policy: "Pleroma.Web.ActivityPub.MRF.HellthreadPolicy",
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label: "MRF Hellthread",
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description: "Block messages with excessive user mentions",
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children: [
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%{
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key: :delist_threshold,
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type: :integer,
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description:
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"Number of mentioned users after which the message gets removed from timelines and" <>
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"disables notifications. Set to 0 to disable.",
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suggestions: [10]
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},
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%{
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key: :reject_threshold,
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type: :integer,
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description:
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"Number of mentioned users after which the messaged gets rejected. Set to 0 to disable.",
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suggestions: [20]
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}
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]
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}
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end
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end
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