def before_task_service(pid, user,
tid) -> (code_list.CodeWithMessage, Project, User):
c, project = before_project_service(pid, user)
if c is not None:
return c, None, None
task = Task.get_task_by_id(tid)
if task is None:
return code_list.TaskNoExists, None, None
if not project.has_task(task):
return code_list.TaskNoExists, None, None
return None, project, task
