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# SPDX-License-Identifier: AGPL-3.0-or-later
# lint: pylint
"""
Method ``http_accept_encoding``
-------------------------------
The ``http_accept_encoding`` method evaluates a request as the request of a
bot if the Accept-Encoding_ header ..
- did not contain ``gzip`` AND ``deflate`` (if both values are missed)
- did not contain ``text/html``
.. _Accept-Encoding:
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Encoding
"""
# pylint: disable=unused-argument
from __future__ import annotations
from ipaddress import (
IPv4Network,
IPv6Network,
)
import flask
import werkzeug
from searx.tools import config
from ._helpers import too_many_requests
def filter_request(
network: IPv4Network | IPv6Network,
request: flask.Request,
cfg: config.Config,
) -> werkzeug.Response | None:
accept_list = [l.strip() for l in request.headers.get('Accept-Encoding', '').split(',')]
if not ('gzip' in accept_list or 'deflate' in accept_list):
return too_many_requests(network, "HTTP header Accept-Encoding did not contain gzip nor deflate")
return None
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