defmodule MobilizonWeb.Resolvers.Group do @moduledoc """ Handles the group-related GraphQL calls. """ alias Mobilizon.Actors alias Mobilizon.Actors.{Actor, Member} alias Mobilizon.Service.ActivityPub alias Mobilizon.Users.User alias MobilizonWeb.API alias MobilizonWeb.Resolvers.Person require Logger @doc """ Find a group """ def find_group(_parent, %{preferred_username: name}, _resolution) do with {:ok, actor} <- ActivityPub.find_or_make_group_from_nickname(name), actor <- Person.proxify_pictures(actor) do {:ok, actor} else _ -> {:error, "Group with name #{name} not found"} end end @doc """ Lists all groups """ def list_groups(_parent, %{page: page, limit: limit}, _resolution) do { :ok, page |> Actors.list_groups(limit) |> Enum.map(fn actor -> Person.proxify_pictures(actor) end) } end @doc """ Create a new group. The creator is automatically added as admin """ def create_group( _parent, args, %{context: %{current_user: user}} ) do with creator_actor_id <- Map.get(args, :creator_actor_id), {:is_owned, %Actor{} = creator_actor} <- User.owns_actor(user, creator_actor_id), args <- Map.put(args, :creator_actor, creator_actor), {:ok, _activity, %Actor{type: :Group} = group} <- API.Groups.create_group(args) do {:ok, group} else {:error, err} when is_bitstring(err) -> {:error, err} {:is_owned, nil} -> {:error, "Creator actor id is not owned by the current user"} end end def create_group(_parent, _args, _resolution) do {:error, "You need to be logged-in to create a group"} end @doc """ Delete an existing group """ def delete_group( _parent, %{group_id: group_id, actor_id: actor_id}, %{context: %{current_user: user}} ) do with {actor_id, ""} <- Integer.parse(actor_id), {group_id, ""} <- Integer.parse(group_id), {:ok, %Actor{} = group} <- Actors.get_group_by_actor_id(group_id), {:is_owned, %Actor{}} <- User.owns_actor(user, actor_id), {:ok, %Member{} = member} <- Actors.get_member(actor_id, group.id), {:is_admin, true} <- Member.is_administrator(member), group <- Actors.delete_group!(group) do {:ok, %{id: group.id}} else {:error, :group_not_found} -> {:error, "Group not found"} {:is_owned, nil} -> {:error, "Actor id is not owned by authenticated user"} {:error, :member_not_found} -> {:error, "Actor id is not a member of this group"} {:is_admin, false} -> {:error, "Actor id is not an administrator of the selected group"} end end def delete_group(_parent, _args, _resolution) do {:error, "You need to be logged-in to delete a group"} end @doc """ Join an existing group """ def join_group( _parent, %{group_id: group_id, actor_id: actor_id}, %{context: %{current_user: user}} ) do with {actor_id, ""} <- Integer.parse(actor_id), {group_id, ""} <- Integer.parse(group_id), {:is_owned, %Actor{} = actor} <- User.owns_actor(user, actor_id), {:ok, %Actor{} = group} <- Actors.get_group_by_actor_id(group_id), {:error, :member_not_found} <- Actors.get_member(actor.id, group.id), {:is_able_to_join, true} <- {:is_able_to_join, Member.can_be_joined(group)}, role <- Member.get_default_member_role(group), {:ok, _} <- Actors.create_member(%{parent_id: group.id, actor_id: actor.id, role: role}) do { :ok, %{ parent: Person.proxify_pictures(group), actor: Person.proxify_pictures(actor), role: role } } else {:is_owned, nil} -> {:error, "Actor id is not owned by authenticated user"} {:error, :group_not_found} -> {:error, "Group id not found"} {:is_able_to_join, false} -> {:error, "You cannot join this group"} {:ok, %Member{}} -> {:error, "You are already a member of this group"} end end def join_group(_parent, _args, _resolution) do {:error, "You need to be logged-in to join a group"} end @doc """ Leave a existing group """ def leave_group( _parent, %{group_id: group_id, actor_id: actor_id}, %{context: %{current_user: user}} ) do with {actor_id, ""} <- Integer.parse(actor_id), {group_id, ""} <- Integer.parse(group_id), {:is_owned, %Actor{} = actor} <- User.owns_actor(user, actor_id), {:ok, %Member{} = member} <- Actors.get_member(actor.id, group_id), {:only_administrator, false} <- {:only_administrator, check_that_member_is_not_last_administrator(group_id, actor_id)}, {:ok, _} <- Mobilizon.Actors.delete_member(member) do {:ok, %{parent: %{id: group_id}, actor: %{id: actor_id}}} else {:is_owned, nil} -> {:error, "Actor id is not owned by authenticated user"} {:error, :member_not_found} -> {:error, "Member not found"} {:only_administrator, true} -> {:error, "You can't leave this group because you are the only administrator"} end end def leave_group(_parent, _args, _resolution) do {:error, "You need to be logged-in to leave a group"} end # We check that the actor asking to leave the group is not it's only administrator # We start by fetching the list of administrator or creators and if there's only one of them # and that it's the actor requesting leaving the group we return true @spec check_that_member_is_not_last_administrator(integer(), integer()) :: boolean() defp check_that_member_is_not_last_administrator(group_id, actor_id) do case Actors.list_administrator_members_for_group(group_id) do [%Member{actor: %Actor{id: member_actor_id}}] -> actor_id == member_actor_id _ -> false end end end