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link_token.html

link_token.html 21 KB
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  1. <!DOCTYPE html>
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  8.     <title>searx.botdetection.link_token &#8212; SearXNG Documentation (2025.4.30+fd33559cf)</title>
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  28.           <li class="nav-item nav-item-1"><a href="../../index.html" accesskey="U">Module code</a> &#187;</li>
    29. 

  29.         <li class="nav-item nav-item-this"><a href="">searx.botdetection.link_token</a></li> 
    30. 

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  33.     <div class="document">
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  36.           <div class="body" role="main">
    37. 

  37.             
    38. 

  38.   <h1>Source code for searx.botdetection.link_token</h1><div class="highlight"><pre>
    39. 

  39. <span></span><span class="c1"># SPDX-License-Identifier: AGPL-3.0-or-later</span>
    40. 

  40. <span class="sd">&quot;&quot;&quot;</span>
    41. 

  41. <span class="sd">Method ``link_token``</span>
    42. 

  42. <span class="sd">---------------------</span>
    43. 

  43. 

  44. <span class="sd">The ``link_token`` method evaluates a request as :py:obj:`suspicious</span>
    45. 

  45. <span class="sd">&lt;is_suspicious&gt;` if the URL ``/client&lt;token&gt;.css`` is not requested by the</span>
    46. 

  46. <span class="sd">client.  By adding a random component (the token) in the URL, a bot can not send</span>
    47. 

  47. <span class="sd">a ping by request a static URL.</span>
    48. 

  48. 

  49. <span class="sd">.. note::</span>
    50. 

  50. 

  51. <span class="sd">   This method requires a redis DB and needs a HTTP X-Forwarded-For_ header.</span>
    52. 

  52. 

  53. <span class="sd">To get in use of this method a flask URL route needs to be added:</span>
    54. 

  54. 

  55. <span class="sd">.. code:: python</span>
    56. 

  56. 

  57. <span class="sd">   @app.route(&#39;/client&lt;token&gt;.css&#39;, methods=[&#39;GET&#39;, &#39;POST&#39;])</span>
    58. 

  58. <span class="sd">   def client_token(token=None):</span>
    59. 

  59. <span class="sd">       link_token.ping(request, token)</span>
    60. 

  60. <span class="sd">       return Response(&#39;&#39;, mimetype=&#39;text/css&#39;)</span>
    61. 

  61. 

  62. <span class="sd">And in the HTML template from flask a stylesheet link is needed (the value of</span>
    63. 

  63. <span class="sd">``link_token`` comes from :py:obj:`get_token`):</span>
    64. 

  64. 

  65. <span class="sd">.. code:: html</span>
    66. 

  66. 

  67. <span class="sd">   &lt;link rel=&quot;stylesheet&quot;</span>
    68. 

  68. <span class="sd">         href=&quot;{{ url_for(&#39;client_token&#39;, token=link_token) }}&quot;</span>
    69. 

  69. <span class="sd">         type=&quot;text/css&quot; &gt;</span>
    70. 

  70. 

  71. <span class="sd">.. _X-Forwarded-For:</span>
    72. 

  72. <span class="sd">   https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-For</span>
    73. 

  73. 

  74. <span class="sd">&quot;&quot;&quot;</span>
    75. 

  75. <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>
    76. 

  76. <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>
    77. 

  77.     <span class="n">IPv4Network</span><span class="p">,</span>
    78. 

  78.     <span class="n">IPv6Network</span><span class="p">,</span>
    79. 

  79.     <span class="n">ip_address</span><span class="p">,</span>
    80. 

  80. <span class="p">)</span>
    81. 

  81. 

  82. <span class="kn">import</span><span class="w"> </span><span class="nn">string</span>
    83. 

  83. <span class="kn">import</span><span class="w"> </span><span class="nn">random</span>
    84. 

  84. 

  85. <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>
    86. 

  86. <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">redisdb</span>
    87. 

  87. <span class="kn">from</span><span class="w"> </span><span class="nn">searx.redislib</span><span class="w"> </span><span class="kn">import</span> <span class="n">secret_hash</span>
    88. 

  88. <span class="kn">from</span><span class="w"> </span><span class="nn">searx.extended_types</span><span class="w"> </span><span class="kn">import</span> <span class="n">SXNG_Request</span>
    89. 

  89. 

  90. <span class="kn">from</span><span class="w"> </span><span class="nn">._helpers</span><span class="w"> </span><span class="kn">import</span> <span class="p">(</span>
    91. 

  91.     <span class="n">get_network</span><span class="p">,</span>
    92. 

  92.     <span class="n">get_real_ip</span><span class="p">,</span>
    93. 

  93. <span class="p">)</span>
    94. 

  94. 

  95. <span class="n">TOKEN_LIVE_TIME</span> <span class="o">=</span> <span class="mi">600</span>
    96. 

  96. <span class="sd">&quot;&quot;&quot;Lifetime (sec) of limiter&#39;s CSS token.&quot;&quot;&quot;</span>
    97. 

  97. 

  98. <span class="n">PING_LIVE_TIME</span> <span class="o">=</span> <span class="mi">3600</span>
    99. 

  99. <span class="sd">&quot;&quot;&quot;Lifetime (sec) of the ping-key from a client (request)&quot;&quot;&quot;</span>
    100. 

  100. 

  101. <span class="n">PING_KEY</span> <span class="o">=</span> <span class="s1">&#39;SearXNG_limiter.ping&#39;</span>
    102. 

  102. <span class="sd">&quot;&quot;&quot;Prefix of all ping-keys generated by :py:obj:`get_ping_key`&quot;&quot;&quot;</span>
    103. 

  103. 

  104. <span class="n">TOKEN_KEY</span> <span class="o">=</span> <span class="s1">&#39;SearXNG_limiter.token&#39;</span>
    105. 

  105. <span class="sd">&quot;&quot;&quot;Key for which the current token is stored in the DB&quot;&quot;&quot;</span>
    106. 

  106. 

  107. <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">&#39;botdetection.link_token&#39;</span><span class="p">)</span>
    108. 

  108. 

  109. 

  110. <div class="viewcode-block" id="is_suspicious">
    111. 

  111. <a class="viewcode-back" href="../../../src/searx.botdetection.html#searx.botdetection.link_token.is_suspicious">[docs]</a>
    112. 

  112. <span class="k">def</span><span class="w"> </span><span class="nf">is_suspicious</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">request</span><span class="p">:</span> <span class="n">SXNG_Request</span><span class="p">,</span> <span class="n">renew</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">False</span><span class="p">):</span>
    113. 

  113. <span class="w">    </span><span class="sd">&quot;&quot;&quot;Checks whether a valid ping is exists for this (client) network, if not</span>
    114. 

  114. <span class="sd">    this request is rated as *suspicious*.  If a valid ping exists and argument</span>
    115. 

  115. <span class="sd">    ``renew`` is ``True`` the expire time of this ping is reset to</span>
    116. 

  116. <span class="sd">    :py:obj:`PING_LIVE_TIME`.</span>
    117. 

  117. 

  118. <span class="sd">    &quot;&quot;&quot;</span>
    119. 

  119.     <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>
    120. 

  120.     <span class="k">if</span> <span class="ow">not</span> <span class="n">redis_client</span><span class="p">:</span>
    121. 

  121.         <span class="k">return</span> <span class="kc">False</span>
    122. 

  122. 

  123.     <span class="n">ping_key</span> <span class="o">=</span> <span class="n">get_ping_key</span><span class="p">(</span><span class="n">network</span><span class="p">,</span> <span class="n">request</span><span class="p">)</span>
    124. 

  124.     <span class="k">if</span> <span class="ow">not</span> <span class="n">redis_client</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">ping_key</span><span class="p">):</span>
    125. 

  125.         <span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">&quot;missing ping (IP: </span><span class="si">%s</span><span class="s2">) / request: </span><span class="si">%s</span><span class="s2">&quot;</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">ping_key</span><span class="p">)</span>
    126. 

  126.         <span class="k">return</span> <span class="kc">True</span>
    127. 

  127. 

  128.     <span class="k">if</span> <span class="n">renew</span><span class="p">:</span>
    129. 

  129.         <span class="n">redis_client</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="n">ping_key</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="n">ex</span><span class="o">=</span><span class="n">PING_LIVE_TIME</span><span class="p">)</span>
    130. 

  130. 

  131.     <span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">&quot;found ping for (client) network </span><span class="si">%s</span><span class="s2"> -&gt; </span><span class="si">%s</span><span class="s2">&quot;</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">ping_key</span><span class="p">)</span>
    132. 

  132.     <span class="k">return</span> <span class="kc">False</span></div>
    133. 

  133. 

  134. 

  135. 

  136. <div class="viewcode-block" id="ping">
    137. 

  137. <a class="viewcode-back" href="../../../src/searx.botdetection.html#searx.botdetection.link_token.ping">[docs]</a>
    138. 

  138. <span class="k">def</span><span class="w"> </span><span class="nf">ping</span><span class="p">(</span><span class="n">request</span><span class="p">:</span> <span class="n">SXNG_Request</span><span class="p">,</span> <span class="n">token</span><span class="p">:</span> <span class="nb">str</span><span class="p">):</span>
    139. 

  139. <span class="w">    </span><span class="sd">&quot;&quot;&quot;This function is called by a request to URL ``/client&lt;token&gt;.css``.  If</span>
    140. 

  140. <span class="sd">    ``token`` is valid a :py:obj:`PING_KEY` for the client is stored in the DB.</span>
    141. 

  141. <span class="sd">    The expire time of this ping-key is :py:obj:`PING_LIVE_TIME`.</span>
    142. 

  142. 

  143. <span class="sd">    &quot;&quot;&quot;</span>
    144. 

  144.     <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">redis_client</span><span class="p">,</span> <span class="n">cfg</span>  <span class="c1"># pylint: disable=import-outside-toplevel, cyclic-import</span>
    145. 

  145. 

  146.     <span class="k">if</span> <span class="ow">not</span> <span class="n">redis_client</span><span class="p">:</span>
    147. 

  147.         <span class="k">return</span>
    148. 

  148.     <span class="k">if</span> <span class="ow">not</span> <span class="n">token_is_valid</span><span class="p">(</span><span class="n">token</span><span class="p">):</span>
    149. 

  149.         <span class="k">return</span>
    150. 

  150. 

  151.     <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>
    152. 

  152.     <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>
    153. 

  153. 

  154.     <span class="n">ping_key</span> <span class="o">=</span> <span class="n">get_ping_key</span><span class="p">(</span><span class="n">network</span><span class="p">,</span> <span class="n">request</span><span class="p">)</span>
    155. 

  155.     <span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">&quot;store ping_key for (client) network </span><span class="si">%s</span><span class="s2"> (IP </span><span class="si">%s</span><span class="s2">) -&gt; </span><span class="si">%s</span><span class="s2">&quot;</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">real_ip</span><span class="p">,</span> <span class="n">ping_key</span><span class="p">)</span>
    156. 

  156.     <span class="n">redis_client</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="n">ping_key</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="n">ex</span><span class="o">=</span><span class="n">PING_LIVE_TIME</span><span class="p">)</span></div>
    157. 

  157. 

  158. 

  159. 

  160. <div class="viewcode-block" id="get_ping_key">
    161. 

  161. <a class="viewcode-back" href="../../../src/searx.botdetection.html#searx.botdetection.link_token.get_ping_key">[docs]</a>
    162. 

  162. <span class="k">def</span><span class="w"> </span><span class="nf">get_ping_key</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">request</span><span class="p">:</span> <span class="n">SXNG_Request</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">str</span><span class="p">:</span>
    163. 

  163. <span class="w">    </span><span class="sd">&quot;&quot;&quot;Generates a hashed key that fits (more or less) to a *WEB-browser</span>
    164. 

  164. <span class="sd">    session* in a network.&quot;&quot;&quot;</span>
    165. 

  165.     <span class="k">return</span> <span class="p">(</span>
    166. 

  166.         <span class="n">PING_KEY</span>
    167. 

  167.         <span class="o">+</span> <span class="s2">&quot;[&quot;</span>
    168. 

  168.         <span class="o">+</span> <span class="n">secret_hash</span><span class="p">(</span>
    169. 

  169.             <span class="n">network</span><span class="o">.</span><span class="n">compressed</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">&#39;Accept-Language&#39;</span><span class="p">,</span> <span class="s1">&#39;&#39;</span><span class="p">)</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">&#39;User-Agent&#39;</span><span class="p">,</span> <span class="s1">&#39;&#39;</span><span class="p">)</span>
    170. 

  170.         <span class="p">)</span>
    171. 

  171.         <span class="o">+</span> <span class="s2">&quot;]&quot;</span>
    172. 

  172.     <span class="p">)</span></div>
    173. 

  173. 

  174. 

  175. 

  176. <span class="k">def</span><span class="w"> </span><span class="nf">token_is_valid</span><span class="p">(</span><span class="n">token</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">bool</span><span class="p">:</span>
    177. 

  177.     <span class="n">valid</span> <span class="o">=</span> <span class="n">token</span> <span class="o">==</span> <span class="n">get_token</span><span class="p">()</span>
    178. 

  178.     <span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">&quot;token is valid --&gt; </span><span class="si">%s</span><span class="s2">&quot;</span><span class="p">,</span> <span class="n">valid</span><span class="p">)</span>
    179. 

  179.     <span class="k">return</span> <span class="n">valid</span>
    180. 

  180. 

  181. 

  182. <div class="viewcode-block" id="get_token">
    183. 

  183. <a class="viewcode-back" href="../../../src/searx.botdetection.html#searx.botdetection.link_token.get_token">[docs]</a>
    184. 

  184. <span class="k">def</span><span class="w"> </span><span class="nf">get_token</span><span class="p">()</span> <span class="o">-&gt;</span> <span class="nb">str</span><span class="p">:</span>
    185. 

  185. <span class="w">    </span><span class="sd">&quot;&quot;&quot;Returns current token.  If there is no currently active token a new token</span>
    186. 

  186. <span class="sd">    is generated randomly and stored in the redis DB.</span>
    187. 

  187. 

  188. <span class="sd">    - :py:obj:`TOKEN_LIVE_TIME`</span>
    189. 

  189. <span class="sd">    - :py:obj:`TOKEN_KEY`</span>
    190. 

  190. 

  191. <span class="sd">    &quot;&quot;&quot;</span>
    192. 

  192.     <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>
    193. 

  193.     <span class="k">if</span> <span class="ow">not</span> <span class="n">redis_client</span><span class="p">:</span>
    194. 

  194.         <span class="c1"># This function is also called when limiter is inactive / no redis DB</span>
    195. 

  195.         <span class="c1"># (see render function in webapp.py)</span>
    196. 

  196.         <span class="k">return</span> <span class="s1">&#39;12345678&#39;</span>
    197. 

  197.     <span class="n">token</span> <span class="o">=</span> <span class="n">redis_client</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">TOKEN_KEY</span><span class="p">)</span>
    198. 

  198.     <span class="k">if</span> <span class="n">token</span><span class="p">:</span>
    199. 

  199.         <span class="n">token</span> <span class="o">=</span> <span class="n">token</span><span class="o">.</span><span class="n">decode</span><span class="p">(</span><span class="s1">&#39;UTF-8&#39;</span><span class="p">)</span>
    200. 

  200.     <span class="k">else</span><span class="p">:</span>
    201. 

  201.         <span class="n">token</span> <span class="o">=</span> <span class="s1">&#39;&#39;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">random</span><span class="o">.</span><span class="n">choice</span><span class="p">(</span><span class="n">string</span><span class="o">.</span><span class="n">ascii_lowercase</span> <span class="o">+</span> <span class="n">string</span><span class="o">.</span><span class="n">digits</span><span class="p">)</span> <span class="k">for</span> <span class="n">_</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">16</span><span class="p">))</span>
    202. 

  202.         <span class="n">redis_client</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="n">TOKEN_KEY</span><span class="p">,</span> <span class="n">token</span><span class="p">,</span> <span class="n">ex</span><span class="o">=</span><span class="n">TOKEN_LIVE_TIME</span><span class="p">)</span>
    203. 

  203.     <span class="k">return</span> <span class="n">token</span></div>
    204. 

  204. 

  205. </pre></div>
    206. 

  206. 

  207.             <div class="clearer"></div>
    208. 

  208.           </div>
    209. 

  209.         </div>
    210. 

  210.       </div>
    211. 

  211.   <span id="sidebar-top"></span>
    212. 

  212.       <div class="sphinxsidebar" role="navigation" aria-label="Main">
    213. 

  213.         <div class="sphinxsidebarwrapper">
    214. 

  214.   
    215. 

  215.     
    216. 

  216.             <p class="logo"><a href="../../../index.html">
    217. 

  217.               <img class="logo" src="../../../_static/searxng-wordmark.svg" alt="Logo of SearXNG"/>
    218. 

  218.             </a></p>
    219. 

  219.   
    220. 

  220. 

  221. <h3><a href="../../../index.html">Table of Contents</a></h3>
    222. 

  222. <ul>
    223. 

  223. <li class="toctree-l1"><a class="reference internal" href="../../../user/index.html">User information</a></li>
    224. 

  224. <li class="toctree-l1"><a class="reference internal" href="../../../own-instance.html">Why use a private instance?</a></li>
    225. 

  225. <li class="toctree-l1"><a class="reference internal" href="../../../admin/index.html">Administrator documentation</a></li>
    226. 

  226. <li class="toctree-l1"><a class="reference internal" href="../../../dev/index.html">Developer documentation</a></li>
    227. 

  227. <li class="toctree-l1"><a class="reference internal" href="../../../utils/index.html">DevOps tooling box</a></li>
    228. 

  228. <li class="toctree-l1"><a class="reference internal" href="../../../src/index.html">Source-Code</a></li>
    229. 

  229. </ul>
    230. 

  230. 

  231.   <h3>Project Links</h3>
    232. 

  232.   <ul>
    233. 

  233.     <li><a href="https://github.com/searxng/searxng/tree/master">Source</a>
    234. 

  234.   
    235. 

  235.     <li><a href="https://github.com/searxng/searxng/wiki">Wiki</a>
    236. 

  236.   
    237. 

  237.     <li><a href="https://searx.space">Public instances</a>
    238. 

  238.   
    239. 

  239.     <li><a href="https://github.com/searxng/searxng/issues">Issue Tracker</a>
    240. 

  240.   </ul><h3>Navigation</h3>
    241. 

  241. <ul>
    242. 

  242.   <li><a href="../../../index.html">Overview</a>
    243. 

  243.     <ul>
    244. 

  244.       <li><a href="../../index.html">Module code</a>
    245. 

  245.         
    246. 

  246.           
    247. 

  247.           </ul>
    248. 

  248.       </li>
    249. 

  249.     </ul>
    250. 

  250.   </li>
    251. 

  251. </ul>
    252. 

  252. <search id="searchbox" style="display: none" role="search">
    253. 

  253.   <h3 id="searchlabel">Quick search</h3>
    254. 

  254.     <div class="searchformwrapper">
    255. 

  255.     <form class="search" action="../../../search.html" method="get">
    256. 

  256.       <input type="text" name="q" aria-labelledby="searchlabel" autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false"/>
    257. 

  257.       <input type="submit" value="Go" />
    258. 

  258.     </form>
    259. 

  259.     </div>
    260. 

  260. </search>
    261. 

  261. <script>document.getElementById('searchbox').style.display = "block"</script>
    262. 

  262.         </div>
    263. 

  263.       </div>
    264. 

  264.       <div class="clearer"></div>
    265. 

  265.     </div>
    266. 

  266.     <div class="footer" role="contentinfo">
    267. 

  267.     &#169; Copyright SearXNG team.
    268. 

  268.     </div>
    269. 

  269.   </body>
    270. 

  270. </html>
    271.
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