Introduce group posts

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

lib/graphql/api/groups.ex

@@ -19,8 +19,25 @@ defmodule Mobilizon.GraphQL.API.Groups do
            args |> Map.get(:preferred_username) |> HTML.strip_tags() |> String.trim(),
          {:existing_group, nil} <-
            {:existing_group, Actors.get_local_group_by_title(preferred_username)},
+         args <- args |> Map.put(:type, :Group),
          {:ok, %Activity{} = activity, %Actor{} = group} <-
-           ActivityPub.create(:group, args, true, %{"actor" => args.creator_actor.url}) do
+           ActivityPub.create(:actor, args, true, %{"actor" => args.creator_actor.url}) do
+      {:ok, activity, group}
+    else
+      {:existing_group, _} ->
+        {:error, "A group with this name already exists"}
+
+      {:is_owned, nil} ->
+        {:error, "Actor id is not owned by authenticated user"}
+    end
+  end
+
+  @spec create_group(map) :: {:ok, Activity.t(), Actor.t()} | any
+  def update_group(%{id: id} = args) do
+    with {:existing_group, {:ok, %Actor{type: :Group} = group}} <-
+           {:existing_group, Actors.get_group_by_actor_id(id)},
+         {:ok, %Activity{} = activity, %Actor{} = group} <-
+           ActivityPub.update(group, args, true, %{"actor" => args.updater_actor.url}) do
       {:ok, activity, group}
     else
       {:existing_group, _} ->