MRF: create MRF.Policy behaviour separate from MRF module

[akkoma] / lib / pleroma / web / activity_pub / mrf / object_age_policy.ex

diff --git a/lib/pleroma/web/activity_pub/mrf/object_age_policy.ex b/lib/pleroma/web/activity_pub/mrf/object_age_policy.ex
index 5f111c72f552ccbf1265bb9230c4cd58a89fdcfb..9a211fd447fc4d9020dd38f9e880b226c7344de7 100644 (file)
--- a/lib/pleroma/web/activity_pub/mrf/object_age_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/object_age_policy.ex
@@ -1,5 +1,5 @@
 # Pleroma: A lightweight social networking server
-# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Web.ActivityPub.MRF.ObjectAgePolicy do
@@ -9,7 +9,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.ObjectAgePolicy do
   require Pleroma.Constants
 
   @moduledoc "Filter activities depending on their age"
-  @behaviour Pleroma.Web.ActivityPub.MRF
+  @behaviour Pleroma.Web.ActivityPub.MRF.Policy
 
   defp check_date(%{"object" => %{"published" => published}} = message) do
     with %DateTime{} = now <- DateTime.utc_now(),
@@ -37,8 +37,13 @@ defmodule Pleroma.Web.ActivityPub.MRF.ObjectAgePolicy do
   defp check_delist(message, actions) do
     if :delist in actions do
       with %User{} = user <- User.get_cached_by_ap_id(message["actor"]) do
-        to = List.delete(message["to"], Pleroma.Constants.as_public()) ++ [user.follower_address]
-        cc = List.delete(message["cc"], user.follower_address) ++ [Pleroma.Constants.as_public()]
+        to =
+          List.delete(message["to"] || [], Pleroma.Constants.as_public()) ++
+            [user.follower_address]
+
+        cc =
+          List.delete(message["cc"] || [], user.follower_address) ++
+            [Pleroma.Constants.as_public()]
 
         message =
           message
@@ -58,8 +63,8 @@ defmodule Pleroma.Web.ActivityPub.MRF.ObjectAgePolicy do
   defp check_strip_followers(message, actions) do
     if :strip_followers in actions do
       with %User{} = user <- User.get_cached_by_ap_id(message["actor"]) do
-        to = List.delete(message["to"], user.follower_address)
-        cc = List.delete(message["cc"], user.follower_address)
+        to = List.delete(message["to"] || [], user.follower_address)
+        cc = List.delete(message["cc"] || [], user.follower_address)
 
         message =
           message
@@ -101,4 +106,32 @@ defmodule Pleroma.Web.ActivityPub.MRF.ObjectAgePolicy do
 
     {:ok, %{mrf_object_age: mrf_object_age}}
   end
+
+  @impl true
+  def config_description do
+    %{
+      key: :mrf_object_age,
+      related_policy: "Pleroma.Web.ActivityPub.MRF.ObjectAgePolicy",
+      label: "MRF Object Age",
+      description:
+        "Rejects or delists posts based on their timestamp deviance from your server's clock.",
+      children: [
+        %{
+          key: :threshold,
+          type: :integer,
+          description: "Required age (in seconds) of a post before actions are taken.",
+          suggestions: [172_800]
+        },
+        %{
+          key: :actions,
+          type: {:list, :atom},
+          description:
+            "A list of actions to apply to the post. `:delist` removes the post from public timelines; " <>
+              "`:strip_followers` removes followers from the ActivityPub recipient list ensuring they won't be delivered to home timelines; " <>
+              "`:reject` rejects the message entirely",
+          suggestions: [:delist, :strip_followers, :reject]
+        }
+      ]
+    }
+  end
 end