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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.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
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