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# SPDX-License-Identifier: AGPL-3.0-or-later
# lint: pylint
"""
Method ``http_accept_language``
-------------------------------
The ``http_accept_language`` method evaluates a request as the request of a bot
if the Accept-Language_ header is unset.
.. _Accept-Language:
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/User-Agent
"""
from typing import Optional, Tuple
import flask
def filter_request(request: flask.Request) -> Optional[Tuple[int, str]]:
if request.headers.get('Accept-Language', '').strip() == '':
return 429, "bot detected, missing HTTP header Accept-Language"
return None
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