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<h1>Source code for searx.limiter</h1><div class="highlight"><pre>
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<span></span><span class="c1"># SPDX-License-Identifier: AGPL-3.0-or-later</span>
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<span class="sd">"""Bot protection / IP rate limitation. The intention of rate limitation is to</span>
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<span class="sd">limit suspicious requests from an IP. The motivation behind this is the fact</span>
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<span class="sd">that SearXNG passes through requests from bots and is thus classified as a bot</span>
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<span class="sd">itself. As a result, the SearXNG engine then receives a CAPTCHA or is blocked</span>
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<span class="sd">by the search engine (the origin) in some other way.</span>
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<span class="sd">To avoid blocking, the requests from bots to SearXNG must also be blocked, this</span>
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<span class="sd">is the task of the limiter. To perform this task, the limiter uses the methods</span>
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<span class="sd">from the :ref:`botdetection`:</span>
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<span class="sd">- Analysis of the HTTP header in the request / :ref:`botdetection probe headers`</span>
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<span class="sd"> can be easily bypassed.</span>
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<span class="sd">- Block and pass lists in which IPs are listed / :ref:`botdetection ip_lists`</span>
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<span class="sd"> are hard to maintain, since the IPs of bots are not all known and change over</span>
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<span class="sd"> the time.</span>
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<span class="sd">- Detection & dynamically :ref:`botdetection rate limit` of bots based on the</span>
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<span class="sd"> behavior of the requests. For dynamically changeable IP lists a Redis</span>
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<span class="sd"> database is needed.</span>
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<span class="sd">The prerequisite for IP based methods is the correct determination of the IP of</span>
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<span class="sd">the client. The IP of the client is determined via the X-Forwarded-For_ HTTP</span>
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<span class="sd">header.</span>
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<span class="sd">.. attention::</span>
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<span class="sd"> A correct setup of the HTTP request headers ``X-Forwarded-For`` and</span>
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<span class="sd"> ``X-Real-IP`` is essential to be able to assign a request to an IP correctly:</span>
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<span class="sd"> - `NGINX RequestHeader`_</span>
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<span class="sd"> - `Apache RequestHeader`_</span>
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<span class="sd">.. _X-Forwarded-For:</span>
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<span class="sd"> https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-For</span>
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<span class="sd">.. _NGINX RequestHeader:</span>
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<span class="sd"> https://docs.searxng.org/admin/installation-nginx.html#nginx-s-searxng-site</span>
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<span class="sd">.. _Apache RequestHeader:</span>
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<span class="sd"> https://docs.searxng.org/admin/installation-apache.html#apache-s-searxng-site</span>
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<span class="sd">Enable Limiter</span>
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<span class="sd">==============</span>
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<span class="sd">To enable the limiter activate:</span>
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<span class="sd">.. code:: yaml</span>
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<span class="sd"> server:</span>
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<span class="sd"> ...</span>
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<span class="sd"> limiter: true # rate limit the number of request on the instance, block some bots</span>
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<span class="sd">and set the redis-url connection. Check the value, it depends on your redis DB</span>
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<span class="sd">(see :ref:`settings redis`), by example:</span>
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<span class="sd">.. code:: yaml</span>
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<span class="sd"> redis:</span>
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<span class="sd"> url: unix:///usr/local/searxng-redis/run/redis.sock?db=0</span>
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<span class="sd">Configure Limiter</span>
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<span class="sd">=================</span>
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<span class="sd">The methods of :ref:`botdetection` the limiter uses are configured in a local</span>
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<span class="sd">file ``/etc/searxng/limiter.toml``. The defaults are shown in limiter.toml_ /</span>
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<span class="sd">Don't copy all values to your local configuration, just enable what you need by</span>
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<span class="sd">overwriting the defaults. For instance to activate the ``link_token`` method in</span>
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<span class="sd">the :ref:`botdetection.ip_limit` you only need to set this option to ``true``:</span>
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<span class="sd">.. code:: toml</span>
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<span class="sd"> [botdetection.ip_limit]</span>
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<span class="sd"> link_token = true</span>
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<span class="sd">.. _limiter.toml:</span>
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<span class="sd">``limiter.toml``</span>
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<span class="sd">================</span>
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<span class="sd">In this file the limiter finds the configuration of the :ref:`botdetection`:</span>
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<span class="sd">- :ref:`botdetection ip_lists`</span>
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<span class="sd">- :ref:`botdetection rate limit`</span>
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<span class="sd">- :ref:`botdetection probe headers`</span>
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<span class="sd">.. kernel-include:: $SOURCEDIR/limiter.toml</span>
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<span class="sd"> :code: toml</span>
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<span class="sd">Implementation</span>
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<span class="sd">==============</span>
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<span class="sd">"""</span>
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<span class="kn">from</span> <span class="nn">__future__</span> <span class="kn">import</span> <span class="n">annotations</span>
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<span class="kn">import</span> <span class="nn">sys</span>
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<span class="kn">from</span> <span class="nn">pathlib</span> <span class="kn">import</span> <span class="n">Path</span>
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<span class="kn">from</span> <span class="nn">ipaddress</span> <span class="kn">import</span> <span class="n">ip_address</span>
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<span class="kn">import</span> <span class="nn">flask</span>
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<span class="kn">import</span> <span class="nn">werkzeug</span>
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<span class="kn">from</span> <span class="nn">searx</span> <span class="kn">import</span> <span class="p">(</span>
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<span class="n">logger</span><span class="p">,</span>
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<span class="n">redisdb</span><span class="p">,</span>
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<span class="p">)</span>
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<span class="kn">from</span> <span class="nn">searx</span> <span class="kn">import</span> <span class="n">botdetection</span>
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<span class="kn">from</span> <span class="nn">searx.botdetection</span> <span class="kn">import</span> <span class="p">(</span>
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<span class="n">config</span><span class="p">,</span>
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<span class="n">http_accept</span><span class="p">,</span>
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<span class="n">http_accept_encoding</span><span class="p">,</span>
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<span class="n">http_accept_language</span><span class="p">,</span>
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<span class="n">http_user_agent</span><span class="p">,</span>
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<span class="n">ip_limit</span><span class="p">,</span>
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<span class="n">ip_lists</span><span class="p">,</span>
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<span class="n">get_network</span><span class="p">,</span>
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<span class="n">get_real_ip</span><span class="p">,</span>
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<span class="n">dump_request</span><span class="p">,</span>
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<span class="p">)</span>
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<span class="c1"># the configuration are limiter.toml and "limiter" in settings.yml so, for</span>
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<span class="c1"># coherency, the logger is "limiter"</span>
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<span class="n">logger</span> <span class="o">=</span> <span class="n">logger</span><span class="o">.</span><span class="n">getChild</span><span class="p">(</span><span class="s1">'limiter'</span><span class="p">)</span>
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<span class="n">CFG</span><span class="p">:</span> <span class="n">config</span><span class="o">.</span><span class="n">Config</span> <span class="o">=</span> <span class="kc">None</span> <span class="c1"># type: ignore</span>
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<span class="n">_INSTALLED</span> <span class="o">=</span> <span class="kc">False</span>
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<span class="n">LIMITER_CFG_SCHEMA</span> <span class="o">=</span> <span class="n">Path</span><span class="p">(</span><span class="vm">__file__</span><span class="p">)</span><span class="o">.</span><span class="n">parent</span> <span class="o">/</span> <span class="s2">"limiter.toml"</span>
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<span class="sd">"""Base configuration (schema) of the botdetection."""</span>
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<span class="n">LIMITER_CFG</span> <span class="o">=</span> <span class="n">Path</span><span class="p">(</span><span class="s1">'/etc/searxng/limiter.toml'</span><span class="p">)</span>
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<span class="sd">"""Local Limiter configuration."""</span>
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<span class="n">CFG_DEPRECATED</span> <span class="o">=</span> <span class="p">{</span>
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<span class="c1"># "dummy.old.foo": "config 'dummy.old.foo' exists only for tests. Don't use it in your real project config."</span>
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<span class="p">}</span>
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<span class="k">def</span> <span class="nf">get_cfg</span><span class="p">()</span> <span class="o">-></span> <span class="n">config</span><span class="o">.</span><span class="n">Config</span><span class="p">:</span>
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<span class="k">global</span> <span class="n">CFG</span> <span class="c1"># pylint: disable=global-statement</span>
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<span class="k">if</span> <span class="n">CFG</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
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<span class="n">CFG</span> <span class="o">=</span> <span class="n">config</span><span class="o">.</span><span class="n">Config</span><span class="o">.</span><span class="n">from_toml</span><span class="p">(</span><span class="n">LIMITER_CFG_SCHEMA</span><span class="p">,</span> <span class="n">LIMITER_CFG</span><span class="p">,</span> <span class="n">CFG_DEPRECATED</span><span class="p">)</span>
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<span class="k">return</span> <span class="n">CFG</span>
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<span class="k">def</span> <span class="nf">filter_request</span><span class="p">(</span><span class="n">request</span><span class="p">:</span> <span class="n">flask</span><span class="o">.</span><span class="n">Request</span><span class="p">)</span> <span class="o">-></span> <span class="n">werkzeug</span><span class="o">.</span><span class="n">Response</span> <span class="o">|</span> <span class="kc">None</span><span class="p">:</span>
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<span class="c1"># pylint: disable=too-many-return-statements</span>
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<span class="n">cfg</span> <span class="o">=</span> <span class="n">get_cfg</span><span class="p">()</span>
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<span class="n">real_ip</span> <span class="o">=</span> <span class="n">ip_address</span><span class="p">(</span><span class="n">get_real_ip</span><span class="p">(</span><span class="n">request</span><span class="p">))</span>
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<span class="n">network</span> <span class="o">=</span> <span class="n">get_network</span><span class="p">(</span><span class="n">real_ip</span><span class="p">,</span> <span class="n">cfg</span><span class="p">)</span>
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<span class="k">if</span> <span class="n">request</span><span class="o">.</span><span class="n">path</span> <span class="o">==</span> <span class="s1">'/healthz'</span><span class="p">:</span>
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<span class="k">return</span> <span class="kc">None</span>
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<span class="c1"># link-local</span>
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<span class="k">if</span> <span class="n">network</span><span class="o">.</span><span class="n">is_link_local</span><span class="p">:</span>
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<span class="k">return</span> <span class="kc">None</span>
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<span class="c1"># block- & pass- lists</span>
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<span class="c1">#</span>
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<span class="c1"># 1. The IP of the request is first checked against the pass-list; if the IP</span>
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<span class="c1"># matches an entry in the list, the request is not blocked.</span>
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<span class="c1"># 2. If no matching entry is found in the pass-list, then a check is made against</span>
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<span class="c1"># the block list; if the IP matches an entry in the list, the request is</span>
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<span class="c1"># blocked.</span>
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<span class="c1"># 3. If the IP is not in either list, the request is not blocked.</span>
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<span class="n">match</span><span class="p">,</span> <span class="n">msg</span> <span class="o">=</span> <span class="n">ip_lists</span><span class="o">.</span><span class="n">pass_ip</span><span class="p">(</span><span class="n">real_ip</span><span class="p">,</span> <span class="n">cfg</span><span class="p">)</span>
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<span class="k">if</span> <span class="n">match</span><span class="p">:</span>
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<span class="n">logger</span><span class="o">.</span><span class="n">warning</span><span class="p">(</span><span class="s2">"PASS </span><span class="si">%s</span><span class="s2">: matched PASSLIST - </span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> <span class="n">network</span><span class="o">.</span><span class="n">compressed</span><span class="p">,</span> <span class="n">msg</span><span class="p">)</span>
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<span class="k">return</span> <span class="kc">None</span>
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<span class="n">match</span><span class="p">,</span> <span class="n">msg</span> <span class="o">=</span> <span class="n">ip_lists</span><span class="o">.</span><span class="n">block_ip</span><span class="p">(</span><span class="n">real_ip</span><span class="p">,</span> <span class="n">cfg</span><span class="p">)</span>
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<span class="k">if</span> <span class="n">match</span><span class="p">:</span>
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<span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s2">"BLOCK </span><span class="si">%s</span><span class="s2">: matched BLOCKLIST - </span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> <span class="n">network</span><span class="o">.</span><span class="n">compressed</span><span class="p">,</span> <span class="n">msg</span><span class="p">)</span>
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<span class="k">return</span> <span class="n">flask</span><span class="o">.</span><span class="n">make_response</span><span class="p">((</span><span class="s1">'IP is on BLOCKLIST - </span><span class="si">%s</span><span class="s1">'</span> <span class="o">%</span> <span class="n">msg</span><span class="p">,</span> <span class="mi">429</span><span class="p">))</span>
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<span class="c1"># methods applied on /</span>
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<span class="k">for</span> <span class="n">func</span> <span class="ow">in</span> <span class="p">[</span>
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<span class="n">http_user_agent</span><span class="p">,</span>
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<span class="p">]:</span>
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<span class="n">val</span> <span class="o">=</span> <span class="n">func</span><span class="o">.</span><span class="n">filter_request</span><span class="p">(</span><span class="n">network</span><span class="p">,</span> <span class="n">request</span><span class="p">,</span> <span class="n">cfg</span><span class="p">)</span>
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<span class="k">if</span> <span class="n">val</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
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<span class="k">return</span> <span class="n">val</span>
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<span class="c1"># methods applied on /search</span>
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<span class="k">if</span> <span class="n">request</span><span class="o">.</span><span class="n">path</span> <span class="o">==</span> <span class="s1">'/search'</span><span class="p">:</span>
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<span class="k">for</span> <span class="n">func</span> <span class="ow">in</span> <span class="p">[</span>
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<span class="n">http_accept</span><span class="p">,</span>
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<span class="n">http_accept_encoding</span><span class="p">,</span>
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<span class="n">http_accept_language</span><span class="p">,</span>
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<span class="n">http_user_agent</span><span class="p">,</span>
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<span class="n">ip_limit</span><span class="p">,</span>
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<span class="p">]:</span>
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<span class="n">val</span> <span class="o">=</span> <span class="n">func</span><span class="o">.</span><span class="n">filter_request</span><span class="p">(</span><span class="n">network</span><span class="p">,</span> <span class="n">request</span><span class="p">,</span> <span class="n">cfg</span><span class="p">)</span>
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<span class="k">if</span> <span class="n">val</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
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<span class="k">return</span> <span class="n">val</span>
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<span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="sa">f</span><span class="s2">"OK </span><span class="si">{</span><span class="n">network</span><span class="si">}</span><span class="s2">: %s"</span><span class="p">,</span> <span class="n">dump_request</span><span class="p">(</span><span class="n">flask</span><span class="o">.</span><span class="n">request</span><span class="p">))</span>
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<span class="k">return</span> <span class="kc">None</span>
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<div class="viewcode-block" id="pre_request">
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<a class="viewcode-back" href="../../admin/searx.limiter.html#searx.limiter.pre_request">[docs]</a>
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<span class="k">def</span> <span class="nf">pre_request</span><span class="p">():</span>
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<span class="w"> </span><span class="sd">"""See :py:obj:`flask.Flask.before_request`"""</span>
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<span class="k">return</span> <span class="n">filter_request</span><span class="p">(</span><span class="n">flask</span><span class="o">.</span><span class="n">request</span><span class="p">)</span></div>
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<div class="viewcode-block" id="is_installed">
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<a class="viewcode-back" href="../../admin/searx.limiter.html#searx.limiter.is_installed">[docs]</a>
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<span class="k">def</span> <span class="nf">is_installed</span><span class="p">():</span>
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<span class="w"> </span><span class="sd">"""Returns ``True`` if limiter is active and a redis DB is available."""</span>
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<span class="k">return</span> <span class="n">_INSTALLED</span></div>
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<div class="viewcode-block" id="initialize">
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<a class="viewcode-back" href="../../admin/searx.limiter.html#searx.limiter.initialize">[docs]</a>
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<span class="k">def</span> <span class="nf">initialize</span><span class="p">(</span><span class="n">app</span><span class="p">:</span> <span class="n">flask</span><span class="o">.</span><span class="n">Flask</span><span class="p">,</span> <span class="n">settings</span><span class="p">):</span>
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<span class="w"> </span><span class="sd">"""Install the limiter"""</span>
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<span class="k">global</span> <span class="n">_INSTALLED</span> <span class="c1"># pylint: disable=global-statement</span>
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<span class="c1"># even if the limiter is not activated, the botdetection must be activated</span>
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<span class="c1"># (e.g. the self_info plugin uses the botdetection to get client IP)</span>
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<span class="n">cfg</span> <span class="o">=</span> <span class="n">get_cfg</span><span class="p">()</span>
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<span class="n">redis_client</span> <span class="o">=</span> <span class="n">redisdb</span><span class="o">.</span><span class="n">client</span><span class="p">()</span>
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<span class="n">botdetection</span><span class="o">.</span><span class="n">init</span><span class="p">(</span><span class="n">cfg</span><span class="p">,</span> <span class="n">redis_client</span><span class="p">)</span>
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<span class="k">if</span> <span class="ow">not</span> <span class="p">(</span><span class="n">settings</span><span class="p">[</span><span class="s1">'server'</span><span class="p">][</span><span class="s1">'limiter'</span><span class="p">]</span> <span class="ow">or</span> <span class="n">settings</span><span class="p">[</span><span class="s1">'server'</span><span class="p">][</span><span class="s1">'public_instance'</span><span class="p">]):</span>
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<span class="k">return</span>
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<span class="k">if</span> <span class="ow">not</span> <span class="n">redis_client</span><span class="p">:</span>
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<span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span>
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<span class="s2">"The limiter requires Redis, please consult the documentation: "</span>
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<span class="s2">"https://docs.searxng.org/admin/searx.limiter.html"</span>
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<span class="p">)</span>
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<span class="k">if</span> <span class="n">settings</span><span class="p">[</span><span class="s1">'server'</span><span class="p">][</span><span class="s1">'public_instance'</span><span class="p">]:</span>
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<span class="n">sys</span><span class="o">.</span><span class="n">exit</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
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<span class="k">return</span>
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<span class="n">_INSTALLED</span> <span class="o">=</span> <span class="kc">True</span>
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<span class="k">if</span> <span class="n">settings</span><span class="p">[</span><span class="s1">'server'</span><span class="p">][</span><span class="s1">'public_instance'</span><span class="p">]:</span>
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<span class="c1"># overwrite limiter.toml setting</span>
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<span class="n">cfg</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s1">'botdetection.ip_limit.link_token'</span><span class="p">,</span> <span class="kc">True</span><span class="p">)</span>
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<span class="n">app</span><span class="o">.</span><span class="n">before_request</span><span class="p">(</span><span class="n">pre_request</span><span class="p">)</span></div>
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</pre></div>
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