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

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# Pleroma: A lightweight social networking server
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# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# 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
@moduledoc "Block messages with too much mentions (configurable)"
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@behaviour Pleroma.Web.ActivityPub.MRF
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 =
case get_recipient_count(message) do
{:public, recipients}
when follower_collection? and recipients > threshold ->
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message
|> Map.put("to", [follower_collection])
|> Map.put("cc", ["https://www.w3.org/ns/activitystreams#Public"])
{:public, recipients} when recipients > threshold ->
message
|> Map.put("to", [])
|> Map.put("cc", ["https://www.w3.org/ns/activitystreams#Public"])
_ ->
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message
end
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{:ok, message}
end
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
if recipients > threshold do
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{:reject, nil}
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else
{:ok, message}
end
end
end
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defp reject_message(message, _threshold), do: {:ok, message}
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defp get_recipient_count(message) do
recipients = (message["to"] || []) ++ (message["cc"] || [])
follower_collection = User.get_cached_by_ap_id(message["actor"]).follower_address
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if Enum.member?(recipients, "https://www.w3.org/ns/activitystreams#Public") do
recipients =
recipients
|> List.delete("https://www.w3.org/ns/activitystreams#Public")
|> List.delete(follower_collection)
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{:public, length(recipients)}
else
recipients =
recipients
|> List.delete(follower_collection)
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{:not_public, length(recipients)}
end
end
@impl true
def filter(%{"type" => "Create"} = message) do
reject_threshold =
Pleroma.Config.get(
[:mrf_hellthread, :reject_threshold],
Pleroma.Config.get([:mrf_hellthread, :threshold])
)
delist_threshold = Pleroma.Config.get([:mrf_hellthread, :delist_threshold])
with {:ok, message} <- reject_message(message, reject_threshold),
{:ok, message} <- delist_message(message, delist_threshold) do
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{:ok, message}
else
_e -> {:reject, nil}
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end
end
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@impl true
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def filter(message), do: {:ok, message}
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end