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#   http://www.apache.org/licenses/LICENSE-2.0
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"""Authentication backend that denies all requests"""
from functools import wraps
from typing import Any, Callable, Optional, Tuple, TypeVar, Union, cast

from flask import Response

CLIENT_AUTH: Optional[Union[Tuple[str, str], Any]] = None


def init_app(_):
    """Initializes authentication"""


T = TypeVar("T", bound=Callable)


def requires_authentication(function: T):
    """Decorator for functions that require authentication"""

    @wraps(function)
    def decorated(*args, **kwargs):
        return Response("Forbidden", 403)

    return cast(T, decorated)