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searxng/searx/plugins/limiter.py

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+# SPDX-License-Identifier: AGPL-3.0-or-later
+# lint: pylint
+# pyright: basic
+"""see :ref:`limiter src`"""
+
+import flask
+
+from searx import redisdb
+from searx.plugins import logger
+from searx.botdetection import limiter
+
+name = "Request limiter"
+description = "Limit the number of request"
+default_on = False
+preference_section = 'service'
+
+logger = logger.getChild('limiter')
+
+
+def pre_request():
+    """See :ref:`flask.Flask.before_request`"""
+    return limiter.filter_request(flask.request)
+
+
+def init(app: flask.Flask, settings) -> bool:
+    if not settings['server']['limiter']:
+        return False
+    if not redisdb.client():
+        logger.error("The limiter requires Redis")
+        return False
+    app.before_request(pre_request)
+    return True