Introduce group basic federation, event new page and notifications

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

lib/federation/activity_stream/converter/todo_list.ex

@@ -0,0 +1,53 @@
+defmodule Mobilizon.Federation.ActivityStream.Converter.TodoList do
+  @moduledoc """
+  TodoList converter.
+
+  This module allows to convert todo lists from ActivityStream format to our own
+  internal one, and back.
+  """
+  alias Mobilizon.Actors.Actor
+  alias Mobilizon.Federation.ActivityPub
+  alias Mobilizon.Federation.ActivityStream.{Converter, Convertible}
+  alias Mobilizon.Todos.TodoList
+
+  @behaviour Converter
+
+  defimpl Convertible, for: TodoList do
+    alias Mobilizon.Federation.ActivityStream.Converter.TodoList, as: TodoListConverter
+
+    defdelegate model_to_as(report), to: TodoListConverter
+  end
+
+  @doc """
+  Convert an todo list struct to an ActivityStream representation
+  """
+  @impl Converter
+  @spec model_to_as(TodoList.t()) :: map
+  def model_to_as(%TodoList{actor: %Actor{url: group_url} = _group} = todo_list) do
+    %{
+      "type" => "TodoList",
+      "actor" => group_url,
+      "id" => todo_list.url,
+      "title" => todo_list.title
+    }
+  end
+
+  @doc """
+  Converts an AP object data to our internal data structure.
+  """
+  @impl Converter
+  @spec as_to_model_data(map) :: {:ok, map} | {:error, any()}
+  def as_to_model_data(%{"type" => "TodoList", "actor" => actor_url} = object) do
+    case ActivityPub.get_or_fetch_actor_by_url(actor_url) do
+      {:ok, %Actor{type: :Group, id: group_id} = _group} ->
+        %{
+          title: object["name"],
+          url: object["id"],
+          actor_id: group_id
+        }
+
+      _ ->
+        {:error, :group_not_found}
+    end
+  end
+end