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# 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
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