Introduce group posts

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/federation/activity_pub/preloader.ex

@@ -0,0 +1,30 @@
+defmodule Mobilizon.Federation.ActivityPub.Preloader do
+  @moduledoc """
+  Module to ensure entities are correctly preloaded
+  """
+
+  # TODO: Move me in a more appropriate place
+  alias Mobilizon.{Actors, Discussions, Events, Resources}
+  alias Mobilizon.Actors.Actor
+  alias Mobilizon.Discussions.{Comment, Discussion}
+  alias Mobilizon.Events.Event
+  alias Mobilizon.Resources.Resource
+  alias Mobilizon.Tombstone
+
+  def maybe_preload(%Event{url: url}),
+    do: {:ok, Events.get_public_event_by_url_with_preload!(url)}
+
+  def maybe_preload(%Comment{url: url}),
+    do: {:ok, Discussions.get_comment_from_url_with_preload!(url)}
+
+  def maybe_preload(%Discussion{} = discussion), do: {:ok, discussion}
+
+  def maybe_preload(%Resource{url: url}),
+    do: {:ok, Resources.get_resource_by_url_with_preloads(url)}
+
+  def maybe_preload(%Actor{url: url}), do: {:ok, Actors.get_actor_by_url!(url, true)}
+
+  def maybe_preload(%Tombstone{uri: _uri} = tombstone), do: {:ok, tombstone}
+
+  def maybe_preload(other), do: {:error, other}
+end