# Pleroma: A lightweight social networking server # Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/> # SPDX-License-Identifier: AGPL-3.0-only defmodule Pleroma.Web.ActivityPub.MRF.ActivityExpirationPolicy do @moduledoc "Adds expiration to all local Create activities" @behaviour Pleroma.Web.ActivityPub.MRF @impl true def filter(activity) do activity = if note?(activity) and local?(activity) do maybe_add_expiration(activity) else activity end {:ok, activity} end @impl true def describe, do: {:ok, %{}} defp local?(%{"actor" => actor}) do String.starts_with?(actor, Pleroma.Web.Endpoint.url()) end defp note?(activity) do match?(%{"type" => "Create", "object" => %{"type" => "Note"}}, activity) end defp maybe_add_expiration(activity) do days = Pleroma.Config.get([:mrf_activity_expiration, :days], 365) expires_at = DateTime.utc_now() |> Timex.shift(days: days) with %{"expires_at" => existing_expires_at} <- activity, :lt <- DateTime.compare(existing_expires_at, expires_at) do activity else _ -> Map.put(activity, "expires_at", expires_at) end end @impl true def config_description do %{ key: :mrf_activity_expiration, related_policy: "Pleroma.Web.ActivityPub.MRF.ActivityExpirationPolicy", label: "MRF Activity Expiration Policy", description: "Adds automatic expiration to all local activities", children: [ %{ key: :days, type: :integer, description: "Default global expiration time for all local activities (in days)", suggestions: [90, 365] } ] } end end