Move API under GraphQL context

lib/graphql/api/groups.ex

@@ -0,0 +1,32 @@
+defmodule Mobilizon.GraphQL.API.Groups do
+  @moduledoc """
+  API for Groups.
+  """
+
+  alias Mobilizon.Actors
+  alias Mobilizon.Actors.Actor
+
+  alias Mobilizon.Federation.ActivityPub
+  alias Mobilizon.Federation.ActivityPub.Activity
+
+  @doc """
+  Create a group
+  """
+  @spec create_group(map) :: {:ok, Activity.t(), Actor.t()} | any
+  def create_group(args) do
+    with preferred_username <-
+           args |> Map.get(:preferred_username) |> HtmlSanitizeEx.strip_tags() |> String.trim(),
+         {:existing_group, nil} <-
+           {:existing_group, Actors.get_local_group_by_title(preferred_username)},
+         {:ok, %Activity{} = activity, %Actor{} = group} <-
+           ActivityPub.create(:group, 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
+end