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86 lines
2.4 KiB
Elixir
86 lines
2.4 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2022 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.AntiMentionSpamPolicy do
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alias Pleroma.User
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require Pleroma.Constants
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@behaviour Pleroma.Web.ActivityPub.MRF.Policy
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defp user_has_posted?(%User{} = u), do: u.note_count > 0
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defp user_has_age?(%User{} = u) do
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diff = NaiveDateTime.utc_now() |> NaiveDateTime.diff(u.inserted_at, :second)
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diff >= :timer.seconds(30)
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end
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defp good_reputation?(%User{} = u) do
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user_has_age?(u) and user_has_posted?(u)
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end
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# copied from HellthreadPolicy
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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 =
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User.get_cached_by_ap_id(message["actor"] || message["attributedTo"]).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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defp object_has_recipients?(%{"object" => object} = activity) do
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{_, object_count} = get_recipient_count(object)
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{_, activity_count} = get_recipient_count(activity)
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object_count + activity_count > 0
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end
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defp object_has_recipients?(object) do
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{_, count} = get_recipient_count(object)
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count > 0
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end
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@impl true
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def filter(%{"type" => "Create", "actor" => actor} = activity) do
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with {:ok, %User{local: false} = u} <- User.get_or_fetch_by_ap_id(actor),
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{:has_mentions, true} <- {:has_mentions, object_has_recipients?(activity)},
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{:good_reputation, true} <- {:good_reputation, good_reputation?(u)} do
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{:ok, activity}
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else
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{:ok, %User{local: true}} ->
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{:ok, activity}
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{:has_mentions, false} ->
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{:ok, activity}
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{:good_reputation, false} ->
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{:reject, "[AntiMentionSpamPolicy] User rejected"}
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{:error, _} ->
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{:reject, "[AntiMentionSpamPolicy] Failed to get or fetch user by ap_id"}
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e ->
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{:reject, "[AntiMentionSpamPolicy] Unhandled error #{inspect(e)}"}
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end
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end
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# in all other cases, pass through
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def filter(message), do: {:ok, message}
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@impl true
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def describe, do: {:ok, %{}}
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end
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