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https://github.com/searxng/searxng
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27 lines
845 B
Python
27 lines
845 B
Python
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# SPDX-License-Identifier: AGPL-3.0-or-later
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# lint: pylint
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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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from typing import Optional, Tuple
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import flask
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def filter_request(request: flask.Request) -> Optional[Tuple[int, str]]:
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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 429, "bot detected, HTTP header Accept-Encoding did not contain gzip nor deflate"
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return None
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