138 lines
3.8 KiB
Elixir
138 lines
3.8 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.ObjectAgePolicy do
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alias Pleroma.Config
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alias Pleroma.User
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require Pleroma.Constants
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@moduledoc "Filter activities depending on their age"
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@behaviour Pleroma.Web.ActivityPub.MRF.Policy
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defp check_date(%{"object" => %{"published" => published}} = message) do
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with %DateTime{} = now <- DateTime.utc_now(),
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{:ok, %DateTime{} = then, _} <- DateTime.from_iso8601(published),
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max_ttl <- Config.get([:mrf_object_age, :threshold]),
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{:ttl, false} <- {:ttl, DateTime.diff(now, then) > max_ttl} do
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{:ok, message}
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else
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{:ttl, true} ->
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{:reject, nil}
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e ->
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{:error, e}
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end
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end
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defp check_reject(message, actions) do
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if :reject in actions do
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{:reject, "[ObjectAgePolicy]"}
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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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defp check_delist(message, actions) do
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if :delist in actions do
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with %User{} = user <- User.get_cached_by_ap_id(message["actor"]) do
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to =
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List.delete(message["to"] || [], Pleroma.Constants.as_public()) ++
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[user.follower_address]
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cc =
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List.delete(message["cc"] || [], user.follower_address) ++
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[Pleroma.Constants.as_public()]
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message =
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message
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|> Map.put("to", to)
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|> Map.put("cc", cc)
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{:ok, message}
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else
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_e ->
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{:reject, "[ObjectAgePolicy] Unhandled error"}
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end
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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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defp check_strip_followers(message, actions) do
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if :strip_followers in actions do
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with %User{} = user <- User.get_cached_by_ap_id(message["actor"]) do
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to = List.delete(message["to"] || [], user.follower_address)
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cc = List.delete(message["cc"] || [], user.follower_address)
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message =
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message
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|> Map.put("to", to)
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|> Map.put("cc", cc)
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{:ok, message}
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else
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_e ->
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{:reject, "[ObjectAgePolicy] Unhandled error"}
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end
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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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@impl true
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def filter(%{"type" => "Create", "published" => _} = message) do
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with actions <- Config.get([:mrf_object_age, :actions]),
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{:reject, _} <- check_date(message),
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{:ok, message} <- check_reject(message, actions),
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{:ok, message} <- check_delist(message, actions),
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{:ok, message} <- check_strip_followers(message, actions) do
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{:ok, message}
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else
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# check_date() is allowed to short-circuit the pipeline
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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 do
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mrf_object_age =
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Config.get(:mrf_object_age)
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|> Enum.into(%{})
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{:ok, %{mrf_object_age: mrf_object_age}}
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end
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@impl true
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def config_description do
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%{
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key: :mrf_object_age,
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related_policy: "Pleroma.Web.ActivityPub.MRF.ObjectAgePolicy",
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label: "MRF Object Age",
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description:
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"Rejects or delists posts based on their timestamp deviance from your server's clock.",
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children: [
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%{
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key: :threshold,
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type: :integer,
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description: "Required age (in seconds) of a post before actions are taken.",
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suggestions: [172_800]
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},
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%{
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key: :actions,
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type: {:list, :atom},
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description:
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"A list of actions to apply to the post. `:delist` removes the post from public timelines; " <>
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"`:strip_followers` removes followers from the ActivityPub recipient list ensuring they won't be delivered to home timelines; " <>
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"`:reject` rejects the message entirely",
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suggestions: [:delist, :strip_followers, :reject]
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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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