activity_expiration_policy.ex
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activity_expiration_policy.ex
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	# Pleroma: A lightweight social networking server
	# Copyright © 2017-2022 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.Policy

	@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