calibre-web/cps/cw_login/mixins.py

class UserMixin:
    """
    This provides default implementations for the methods that Flask-Login
    expects user objects to have.
    """

    # Python 3 implicitly set __hash__ to None if we override __eq__
    # We set it back to its default implementation
    __hash__ = object.__hash__

    @property
    def is_active(self):
        return True

    @property
    def is_authenticated(self):
        return self.is_active

    @property
    def is_anonymous(self):
        return False

    def get_id(self):
        try:
            return str(self.id)
        except AttributeError:
            raise NotImplementedError("No `id` attribute - override `get_id`") from None

    def __eq__(self, other):
        """
        Checks the equality of two `UserMixin` objects using `get_id`.
        """
        if isinstance(other, UserMixin):
            return self.get_id() == other.get_id()
        return NotImplemented

    def __ne__(self, other):
        """
        Checks the inequality of two `UserMixin` objects using `get_id`.
        """
        equal = self.__eq__(other)
        if equal is NotImplemented:
            return NotImplemented
        return not equal


class AnonymousUserMixin:
    """
    This is the default object for representing an anonymous user.
    """

    @property
    def is_authenticated(self):
        return False

    @property
    def is_active(self):
        return False

    @property
    def is_anonymous(self):
        return True

    def get_id(self):
        return