98 lines
2.7 KiB
Elixir
98 lines
2.7 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.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
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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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follower_collection? = Enum.member?(message["to"] ++ message["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, nil}
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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"} = message) 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 -> {:reject, nil}
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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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end
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