"""Authenticated user information."""

from abc import ABC, abstractmethod

class User(ABC):

"""A representation of an authenticated user."""

@property

@abstractmethod

def is_authenticated(self) -> bool:

"""Returns whether the current user is authenticated."""

@property

@abstractmethod

def user_name(self) -> str:

"""Returns the user name of the current user."""

class UnauthenticatedUser(User):

"""A representation that no user has been authenticated in the request."""

@property

def is_authenticated(self) -> bool:

"""Returns whether the current user is authenticated."""

return False

@property

def user_name(self) -> str:

"""Returns the user name of the current user."""

return ''