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<h1>Source code for searx.botdetection._helpers</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="c1"># pylint: disable=missing-module-docstring, invalid-name</span>
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<span class="kn">from</span><span class="w"> </span><span class="nn">__future__</span><span class="w"> </span><span class="kn">import</span> <span class="n">annotations</span>
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<span class="kn">import</span><span class="w"> </span><span class="nn">typing</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="nn">t</span>
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<span class="n">__all__</span> <span class="o">=</span> <span class="p">[</span><span class="s2">"log_error_only_once"</span><span class="p">,</span> <span class="s2">"dump_request"</span><span class="p">,</span> <span class="s2">"get_network"</span><span class="p">,</span> <span class="s2">"logger"</span><span class="p">,</span> <span class="s2">"too_many_requests"</span><span class="p">]</span>
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<span class="kn">from</span><span class="w"> </span><span class="nn">ipaddress</span><span class="w"> </span><span class="kn">import</span> <span class="p">(</span>
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<span class="n">IPv4Network</span><span class="p">,</span>
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<span class="n">IPv6Network</span><span class="p">,</span>
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<span class="n">IPv4Address</span><span class="p">,</span>
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<span class="n">IPv6Address</span><span class="p">,</span>
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<span class="n">ip_network</span><span class="p">,</span>
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<span class="p">)</span>
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<span class="kn">import</span><span class="w"> </span><span class="nn">flask</span>
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<span class="kn">import</span><span class="w"> </span><span class="nn">werkzeug</span>
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<span class="kn">from</span><span class="w"> </span><span class="nn">searx</span><span class="w"> </span><span class="kn">import</span> <span class="n">logger</span>
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<span class="k">if</span> <span class="n">t</span><span class="o">.</span><span class="n">TYPE_CHECKING</span><span class="p">:</span>
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<span class="kn">from</span><span class="w"> </span><span class="nn">.</span><span class="w"> </span><span class="kn">import</span> <span class="n">config</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">'botdetection'</span><span class="p">)</span>
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<span class="k">def</span><span class="w"> </span><span class="nf">dump_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>
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<span class="k">return</span> <span class="p">(</span>
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<span class="n">request</span><span class="o">.</span><span class="n">path</span>
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<span class="o">+</span> <span class="s2">" || X-Forwarded-For: </span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="n">request</span><span class="o">.</span><span class="n">headers</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'X-Forwarded-For'</span><span class="p">)</span>
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<span class="o">+</span> <span class="s2">" || X-Real-IP: </span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="n">request</span><span class="o">.</span><span class="n">headers</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'X-Real-IP'</span><span class="p">)</span>
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<span class="o">+</span> <span class="s2">" || form: </span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="n">request</span><span class="o">.</span><span class="n">form</span>
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<span class="o">+</span> <span class="s2">" || Accept: </span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="n">request</span><span class="o">.</span><span class="n">headers</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'Accept'</span><span class="p">)</span>
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<span class="o">+</span> <span class="s2">" || Accept-Language: </span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="n">request</span><span class="o">.</span><span class="n">headers</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'Accept-Language'</span><span class="p">)</span>
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<span class="o">+</span> <span class="s2">" || Accept-Encoding: </span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="n">request</span><span class="o">.</span><span class="n">headers</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'Accept-Encoding'</span><span class="p">)</span>
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<span class="o">+</span> <span class="s2">" || Content-Type: </span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="n">request</span><span class="o">.</span><span class="n">headers</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'Content-Type'</span><span class="p">)</span>
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<span class="o">+</span> <span class="s2">" || Content-Length: </span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="n">request</span><span class="o">.</span><span class="n">headers</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'Content-Length'</span><span class="p">)</span>
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<span class="o">+</span> <span class="s2">" || Connection: </span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="n">request</span><span class="o">.</span><span class="n">headers</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'Connection'</span><span class="p">)</span>
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<span class="o">+</span> <span class="s2">" || User-Agent: </span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="n">request</span><span class="o">.</span><span class="n">headers</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'User-Agent'</span><span class="p">)</span>
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<span class="o">+</span> <span class="s2">" || Sec-Fetch-Site: </span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="n">request</span><span class="o">.</span><span class="n">headers</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'Sec-Fetch-Site'</span><span class="p">)</span>
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<span class="o">+</span> <span class="s2">" || Sec-Fetch-Mode: </span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="n">request</span><span class="o">.</span><span class="n">headers</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'Sec-Fetch-Mode'</span><span class="p">)</span>
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<span class="o">+</span> <span class="s2">" || Sec-Fetch-Dest: </span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="n">request</span><span class="o">.</span><span class="n">headers</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'Sec-Fetch-Dest'</span><span class="p">)</span>
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<span class="p">)</span>
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<div class="viewcode-block" id="too_many_requests">
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<a class="viewcode-back" href="../../../src/searx.botdetection.html#searx.botdetection.too_many_requests">[docs]</a>
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<span class="k">def</span><span class="w"> </span><span class="nf">too_many_requests</span><span class="p">(</span><span class="n">network</span><span class="p">:</span> <span class="n">IPv4Network</span> <span class="o">|</span> <span class="n">IPv6Network</span><span class="p">,</span> <span class="n">log_msg</span><span class="p">:</span> <span class="nb">str</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="w"> </span><span class="sd">"""Returns a HTTP 429 response object and writes a ERROR message to the</span>
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<span class="sd"> 'botdetection' logger. This function is used in part by the filter methods</span>
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<span class="sd"> to return the default ``Too Many Requests`` response.</span>
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<span class="sd"> """</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="s2">"BLOCK </span><span class="si">%s</span><span class="s2">: </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">log_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">'Too Many Requests'</span><span class="p">,</span> <span class="mi">429</span><span class="p">))</span></div>
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<div class="viewcode-block" id="get_network">
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<a class="viewcode-back" href="../../../src/searx.botdetection.html#searx.botdetection.get_network">[docs]</a>
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<span class="k">def</span><span class="w"> </span><span class="nf">get_network</span><span class="p">(</span><span class="n">real_ip</span><span class="p">:</span> <span class="n">IPv4Address</span> <span class="o">|</span> <span class="n">IPv6Address</span><span class="p">,</span> <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="p">)</span> <span class="o">-></span> <span class="n">IPv4Network</span> <span class="o">|</span> <span class="n">IPv6Network</span><span class="p">:</span>
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<span class="w"> </span><span class="sd">"""Returns the (client) network of whether the ``real_ip`` is part of.</span>
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<span class="sd"> The ``ipv4_prefix`` and ``ipv6_prefix`` define the number of leading bits in</span>
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<span class="sd"> an address that are compared to determine whether or not an address is part</span>
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<span class="sd"> of a (client) network.</span>
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<span class="sd"> .. code:: toml</span>
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<span class="sd"> [botdetection]</span>
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<span class="sd"> ipv4_prefix = 32</span>
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<span class="sd"> ipv6_prefix = 48</span>
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<span class="sd"> """</span>
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<span class="n">prefix</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="n">cfg</span><span class="p">[</span><span class="s2">"botdetection.ipv4_prefix"</span><span class="p">]</span>
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<span class="k">if</span> <span class="n">real_ip</span><span class="o">.</span><span class="n">version</span> <span class="o">==</span> <span class="mi">6</span><span class="p">:</span>
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<span class="n">prefix</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="n">cfg</span><span class="p">[</span><span class="s2">"botdetection.ipv6_prefix"</span><span class="p">]</span>
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<span class="n">network</span> <span class="o">=</span> <span class="n">ip_network</span><span class="p">(</span><span class="sa">f</span><span class="s2">"</span><span class="si">{</span><span class="n">real_ip</span><span class="si">}</span><span class="s2">/</span><span class="si">{</span><span class="n">prefix</span><span class="si">}</span><span class="s2">"</span><span class="p">,</span> <span class="n">strict</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
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<span class="c1"># logger.debug("get_network(): %s", network.compressed)</span>
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<span class="k">return</span> <span class="n">network</span></div>
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<span class="n">_logged_errors</span><span class="p">:</span> <span class="nb">list</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="p">[]</span>
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<span class="k">def</span><span class="w"> </span><span class="nf">log_error_only_once</span><span class="p">(</span><span class="n">err_msg</span><span class="p">:</span> <span class="nb">str</span><span class="p">):</span>
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<span class="k">if</span> <span class="n">err_msg</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">_logged_errors</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="n">err_msg</span><span class="p">)</span>
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<span class="n">_logged_errors</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">err_msg</span><span class="p">)</span>
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