Add ability to update/create/delete identities

lib/mobilizon_web/resolvers/person.ex

@@ -69,9 +69,80 @@ defmodule MobilizonWeb.Resolvers.Person do
     {:error, "You need to be logged-in to create a new identity"}
   end
 
+  @doc """
+  This function is used to update an existing identity
+  """
+  def update_person(
+        _parent,
+        %{preferred_username: preferred_username} = args,
+        %{
+          context: %{
+            current_user: user
+          }
+        } = _resolution
+      ) do
+    args = Map.put(args, :user_id, user.id)
+
+    with {:find_actor, %Actor{} = actor} <-
+           {:find_actor, Actors.get_actor_by_name(preferred_username)},
+         {:is_owned, true, _} <- User.owns_actor(user, actor.id),
+         args <- save_attached_pictures(args),
+         {:ok, actor} <- Actors.update_actor(actor, args) do
+      {:ok, actor}
+    else
+      {:find_actor, nil} ->
+        {:error, "Actor not found"}
+
+      {:is_owned, false} ->
+        {:error, "Actor is not owned by authenticated user"}
+    end
+  end
+
+  def update_person(_parent, _args, _resolution) do
+    {:error, "You need to be logged-in to update an identity"}
+  end
+
+  @doc """
+  This function is used to delete an existing identity
+  """
+  def delete_person(
+        _parent,
+        %{preferred_username: preferred_username} = _args,
+        %{
+          context: %{
+            current_user: user
+          }
+        } = _resolution
+      ) do
+    with {:find_actor, %Actor{} = actor} <-
+           {:find_actor, Actors.get_actor_by_name(preferred_username)},
+         {:is_owned, true, _} <- User.owns_actor(user, actor.id),
+         {:last_identity, false} <- {:last_identity, last_identity?(user)},
+         {:ok, actor} <- Actors.delete_actor(actor) do
+      {:ok, actor}
+    else
+      {:find_actor, nil} ->
+        {:error, "Actor not found"}
+
+      {:last_identity, true} ->
+        {:error, "Cannot remove the last identity of a user"}
+
+      {:is_owned, false} ->
+        {:error, "Actor is not owned by authenticated user"}
+    end
+  end
+
+  def delete_person(_parent, _args, _resolution) do
+    {:error, "You need to be logged-in to delete an identity"}
+  end
+
+  defp last_identity?(user) do
+    length(Users.get_actors_for_user(user)) <= 1
+  end
+
   defp save_attached_pictures(args) do
     Enum.reduce([:avatar, :banner], args, fn key, args ->
-      if Map.has_key?(args, key) do
+      if Map.has_key?(args, key) && !is_nil(args[key][:picture]) do
         pic = args[key][:picture]
 
         with {:ok, %{"name" => name, "url" => [%{"href" => url, "mediaType" => content_type}]}} <-