first commit

searx/botdetection/http_accept_language.py

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+# SPDX-License-Identifier: AGPL-3.0-or-later
+"""
+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 __future__ import annotations
+from ipaddress import (
+    IPv4Network,
+    IPv6Network,
+)
+
+import werkzeug
+
+from searx.extended_types import SXNG_Request
+
+from . import config
+from ._helpers import too_many_requests
+
+
+def filter_request(
+    network: IPv4Network | IPv6Network,
+    request: SXNG_Request,
+    cfg: config.Config,  # pylint: disable=unused-argument
+) -> werkzeug.Response | None:
+    if request.headers.get('Accept-Language', '').strip() == '':
+        return too_many_requests(network, "missing HTTP header Accept-Language")
+    return None