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