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<h1>Source code for searx.engines</h1><div class="highlight"><pre>
<span></span><span class="c1"># SPDX-License-Identifier: AGPL-3.0-or-later</span>
<span class="c1"># lint: pylint</span>
<span class="sd">&quot;&quot;&quot;This module implements the engine loader.</span>
<span class="sd">Load and initialize the ``engines``, see :py:func:`load_engines` and register</span>
<span class="sd">:py:obj:`engine_shortcuts`.</span>
<span class="sd">usage::</span>
<span class="sd"> load_engines( settings[&#39;engines&#39;] )</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="kn">import</span> <span class="nn">sys</span>
<span class="kn">import</span> <span class="nn">copy</span>
<span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">Dict</span><span class="p">,</span> <span class="n">List</span><span class="p">,</span> <span class="n">Optional</span>
<span class="kn">from</span> <span class="nn">os.path</span> <span class="kn">import</span> <span class="n">realpath</span><span class="p">,</span> <span class="n">dirname</span>
<span class="kn">from</span> <span class="nn">babel.localedata</span> <span class="kn">import</span> <span class="n">locale_identifiers</span>
<span class="kn">from</span> <span class="nn">searx</span> <span class="kn">import</span> <span class="n">logger</span><span class="p">,</span> <span class="n">settings</span>
<span class="kn">from</span> <span class="nn">searx.data</span> <span class="kn">import</span> <span class="n">ENGINES_LANGUAGES</span>
<span class="kn">from</span> <span class="nn">searx.network</span> <span class="kn">import</span> <span class="n">get</span>
<span class="kn">from</span> <span class="nn">searx.utils</span> <span class="kn">import</span> <span class="n">load_module</span><span class="p">,</span> <span class="n">match_language</span><span class="p">,</span> <span class="n">gen_useragent</span>
<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;engines&#39;</span><span class="p">)</span>
<span class="n">ENGINE_DIR</span> <span class="o">=</span> <span class="n">dirname</span><span class="p">(</span><span class="n">realpath</span><span class="p">(</span><span class="vm">__file__</span><span class="p">))</span>
<span class="n">BABEL_LANGS</span> <span class="o">=</span> <span class="p">[</span>
<span class="n">lang_parts</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">+</span> <span class="s1">&#39;-&#39;</span> <span class="o">+</span> <span class="n">lang_parts</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">lang_parts</span><span class="p">)</span> <span class="o">&gt;</span> <span class="mi">1</span> <span class="k">else</span> <span class="n">lang_parts</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="k">for</span> <span class="n">lang_parts</span> <span class="ow">in</span> <span class="p">(</span><span class="n">lang_code</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s1">&#39;_&#39;</span><span class="p">)</span> <span class="k">for</span> <span class="n">lang_code</span> <span class="ow">in</span> <span class="n">locale_identifiers</span><span class="p">())</span>
<span class="p">]</span>
<span class="n">ENGINE_DEFAULT_ARGS</span> <span class="o">=</span> <span class="p">{</span>
<span class="s2">&quot;engine_type&quot;</span><span class="p">:</span> <span class="s2">&quot;online&quot;</span><span class="p">,</span>
<span class="s2">&quot;inactive&quot;</span><span class="p">:</span> <span class="kc">False</span><span class="p">,</span>
<span class="s2">&quot;disabled&quot;</span><span class="p">:</span> <span class="kc">False</span><span class="p">,</span>
<span class="s2">&quot;timeout&quot;</span><span class="p">:</span> <span class="n">settings</span><span class="p">[</span><span class="s2">&quot;outgoing&quot;</span><span class="p">][</span><span class="s2">&quot;request_timeout&quot;</span><span class="p">],</span>
<span class="s2">&quot;shortcut&quot;</span><span class="p">:</span> <span class="s2">&quot;-&quot;</span><span class="p">,</span>
<span class="s2">&quot;categories&quot;</span><span class="p">:</span> <span class="p">[</span><span class="s2">&quot;general&quot;</span><span class="p">],</span>
<span class="s2">&quot;supported_languages&quot;</span><span class="p">:</span> <span class="p">[],</span>
<span class="s2">&quot;language_aliases&quot;</span><span class="p">:</span> <span class="p">{},</span>
<span class="s2">&quot;paging&quot;</span><span class="p">:</span> <span class="kc">False</span><span class="p">,</span>
<span class="s2">&quot;safesearch&quot;</span><span class="p">:</span> <span class="kc">False</span><span class="p">,</span>
<span class="s2">&quot;time_range_support&quot;</span><span class="p">:</span> <span class="kc">False</span><span class="p">,</span>
<span class="s2">&quot;enable_http&quot;</span><span class="p">:</span> <span class="kc">False</span><span class="p">,</span>
<span class="s2">&quot;using_tor_proxy&quot;</span><span class="p">:</span> <span class="kc">False</span><span class="p">,</span>
<span class="s2">&quot;display_error_messages&quot;</span><span class="p">:</span> <span class="kc">True</span><span class="p">,</span>
<span class="s2">&quot;send_accept_language_header&quot;</span><span class="p">:</span> <span class="kc">False</span><span class="p">,</span>
<span class="s2">&quot;tokens&quot;</span><span class="p">:</span> <span class="p">[],</span>
<span class="s2">&quot;about&quot;</span><span class="p">:</span> <span class="p">{},</span>
<span class="p">}</span>
<span class="c1"># set automatically when an engine does not have any tab category</span>
<span class="n">OTHER_CATEGORY</span> <span class="o">=</span> <span class="s1">&#39;other&#39;</span>
<div class="viewcode-block" id="Engine"><a class="viewcode-back" href="../../src/searx.engines.html#searx.engines.Engine">[docs]</a><span class="k">class</span> <span class="nc">Engine</span><span class="p">:</span> <span class="c1"># pylint: disable=too-few-public-methods</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;This class is currently never initialized and only used for type hinting.&quot;&quot;&quot;</span>
<span class="n">name</span><span class="p">:</span> <span class="nb">str</span>
<span class="n">engine</span><span class="p">:</span> <span class="nb">str</span>
<span class="n">shortcut</span><span class="p">:</span> <span class="nb">str</span>
<span class="n">categories</span><span class="p">:</span> <span class="n">List</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span>
<span class="n">supported_languages</span><span class="p">:</span> <span class="n">List</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span>
<span class="n">about</span><span class="p">:</span> <span class="nb">dict</span>
<span class="n">inactive</span><span class="p">:</span> <span class="nb">bool</span>
<span class="n">disabled</span><span class="p">:</span> <span class="nb">bool</span>
<span class="n">language_support</span><span class="p">:</span> <span class="nb">bool</span>
<span class="n">paging</span><span class="p">:</span> <span class="nb">bool</span>
<span class="n">safesearch</span><span class="p">:</span> <span class="nb">bool</span>
<span class="n">time_range_support</span><span class="p">:</span> <span class="nb">bool</span>
<span class="n">timeout</span><span class="p">:</span> <span class="nb">float</span></div>
<span class="c1"># Defaults for the namespace of an engine module, see :py:func:`load_engine`</span>
<span class="n">categories</span> <span class="o">=</span> <span class="p">{</span><span class="s1">&#39;general&#39;</span><span class="p">:</span> <span class="p">[]}</span>
<span class="n">engines</span><span class="p">:</span> <span class="n">Dict</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n">Engine</span><span class="p">]</span> <span class="o">=</span> <span class="p">{}</span>
<span class="n">engine_shortcuts</span> <span class="o">=</span> <span class="p">{}</span>
<span class="sd">&quot;&quot;&quot;Simple map of registered *shortcuts* to name of the engine (or ``None``).</span>
<span class="sd">::</span>
<span class="sd"> engine_shortcuts[engine.shortcut] = engine.name</span>
<span class="sd">:meta hide-value:</span>
<span class="sd">&quot;&quot;&quot;</span>
<div class="viewcode-block" id="load_engine"><a class="viewcode-back" href="../../src/searx.engines.html#searx.engines.load_engine">[docs]</a><span class="k">def</span> <span class="nf">load_engine</span><span class="p">(</span><span class="n">engine_data</span><span class="p">:</span> <span class="nb">dict</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">Optional</span><span class="p">[</span><span class="n">Engine</span><span class="p">]:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;Load engine from ``engine_data``.</span>
<span class="sd"> :param dict engine_data: Attributes from YAML ``settings:engines/&lt;engine&gt;``</span>
<span class="sd"> :return: initialized namespace of the ``&lt;engine&gt;``.</span>
<span class="sd"> 1. create a namespace and load module of the ``&lt;engine&gt;``</span>
<span class="sd"> 2. update namespace with the defaults from :py:obj:`ENGINE_DEFAULT_ARGS`</span>
<span class="sd"> 3. update namespace with values from ``engine_data``</span>
<span class="sd"> If engine *is active*, return namespace of the engine, otherwise return</span>
<span class="sd"> ``None``.</span>
<span class="sd"> This function also returns ``None`` if initialization of the namespace fails</span>
<span class="sd"> for one of the following reasons:</span>
<span class="sd"> - engine name contains underscore</span>
<span class="sd"> - engine name is not lowercase</span>
<span class="sd"> - required attribute is not set :py:func:`is_missing_required_attributes`</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="c1"># pylint: disable=too-many-return-statements</span>
<span class="n">engine_name</span> <span class="o">=</span> <span class="n">engine_data</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;name&#39;</span><span class="p">)</span>
<span class="k">if</span> <span class="n">engine_name</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s1">&#39;An engine does not have a &quot;name&quot; field&#39;</span><span class="p">)</span>
<span class="k">return</span> <span class="kc">None</span>
<span class="k">if</span> <span class="s1">&#39;_&#39;</span> <span class="ow">in</span> <span class="n">engine_name</span><span class="p">:</span>
<span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s1">&#39;Engine name contains underscore: &quot;</span><span class="si">{}</span><span class="s1">&quot;&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">engine_name</span><span class="p">))</span>
<span class="k">return</span> <span class="kc">None</span>
<span class="k">if</span> <span class="n">engine_name</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span> <span class="o">!=</span> <span class="n">engine_name</span><span class="p">:</span>
<span class="n">logger</span><span class="o">.</span><span class="n">warn</span><span class="p">(</span><span class="s1">&#39;Engine name is not lowercase: &quot;</span><span class="si">{}</span><span class="s1">&quot;, converting to lowercase&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">engine_name</span><span class="p">))</span>
<span class="n">engine_name</span> <span class="o">=</span> <span class="n">engine_name</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span>
<span class="n">engine_data</span><span class="p">[</span><span class="s1">&#39;name&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="n">engine_name</span>
<span class="c1"># load_module</span>
<span class="n">engine_module</span> <span class="o">=</span> <span class="n">engine_data</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;engine&#39;</span><span class="p">)</span>
<span class="k">if</span> <span class="n">engine_module</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s1">&#39;The &quot;engine&quot; field is missing for the engine named &quot;</span><span class="si">{}</span><span class="s1">&quot;&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">engine_name</span><span class="p">))</span>
<span class="k">return</span> <span class="kc">None</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">engine</span> <span class="o">=</span> <span class="n">load_module</span><span class="p">(</span><span class="n">engine_module</span> <span class="o">+</span> <span class="s1">&#39;.py&#39;</span><span class="p">,</span> <span class="n">ENGINE_DIR</span><span class="p">)</span>
<span class="k">except</span> <span class="p">(</span><span class="ne">SyntaxError</span><span class="p">,</span> <span class="ne">KeyboardInterrupt</span><span class="p">,</span> <span class="ne">SystemExit</span><span class="p">,</span> <span class="ne">SystemError</span><span class="p">,</span> <span class="ne">ImportError</span><span class="p">,</span> <span class="ne">RuntimeError</span><span class="p">):</span>
<span class="n">logger</span><span class="o">.</span><span class="n">exception</span><span class="p">(</span><span class="s1">&#39;Fatal exception in engine &quot;</span><span class="si">{}</span><span class="s1">&quot;&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">engine_module</span><span class="p">))</span>
<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>
<span class="k">except</span> <span class="ne">BaseException</span><span class="p">:</span>
<span class="n">logger</span><span class="o">.</span><span class="n">exception</span><span class="p">(</span><span class="s1">&#39;Cannot load engine &quot;</span><span class="si">{}</span><span class="s1">&quot;&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">engine_module</span><span class="p">))</span>
<span class="k">return</span> <span class="kc">None</span>
<span class="n">update_engine_attributes</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="n">engine_data</span><span class="p">)</span>
<span class="n">set_language_attributes</span><span class="p">(</span><span class="n">engine</span><span class="p">)</span>
<span class="n">update_attributes_for_tor</span><span class="p">(</span><span class="n">engine</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">is_engine_active</span><span class="p">(</span><span class="n">engine</span><span class="p">):</span>
<span class="k">return</span> <span class="kc">None</span>
<span class="k">if</span> <span class="n">is_missing_required_attributes</span><span class="p">(</span><span class="n">engine</span><span class="p">):</span>
<span class="k">return</span> <span class="kc">None</span>
<span class="n">set_loggers</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="n">engine_name</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">any</span><span class="p">(</span><span class="n">cat</span> <span class="ow">in</span> <span class="n">settings</span><span class="p">[</span><span class="s1">&#39;categories_as_tabs&#39;</span><span class="p">]</span> <span class="k">for</span> <span class="n">cat</span> <span class="ow">in</span> <span class="n">engine</span><span class="o">.</span><span class="n">categories</span><span class="p">):</span>
<span class="n">engine</span><span class="o">.</span><span class="n">categories</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">OTHER_CATEGORY</span><span class="p">)</span>
<span class="k">return</span> <span class="n">engine</span></div>
<span class="k">def</span> <span class="nf">set_loggers</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="n">engine_name</span><span class="p">):</span>
<span class="c1"># set the logger for engine</span>
<span class="n">engine</span><span class="o">.</span><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="n">engine_name</span><span class="p">)</span>
<span class="c1"># the engine may have load some other engines</span>
<span class="c1"># may sure the logger is initialized</span>
<span class="c1"># use sys.modules.copy() to avoid &quot;RuntimeError: dictionary changed size during iteration&quot;</span>
<span class="c1"># see https://github.com/python/cpython/issues/89516</span>
<span class="c1"># and https://docs.python.org/3.10/library/sys.html#sys.modules</span>
<span class="n">modules</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">modules</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span>
<span class="k">for</span> <span class="n">module_name</span><span class="p">,</span> <span class="n">module</span> <span class="ow">in</span> <span class="n">modules</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
<span class="k">if</span> <span class="p">(</span>
<span class="n">module_name</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s2">&quot;searx.engines&quot;</span><span class="p">)</span>
<span class="ow">and</span> <span class="n">module_name</span> <span class="o">!=</span> <span class="s2">&quot;searx.engines.__init__&quot;</span>
<span class="ow">and</span> <span class="ow">not</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">module</span><span class="p">,</span> <span class="s2">&quot;logger&quot;</span><span class="p">)</span>
<span class="p">):</span>
<span class="n">module_engine_name</span> <span class="o">=</span> <span class="n">module_name</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s2">&quot;.&quot;</span><span class="p">)[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span>
<span class="n">module</span><span class="o">.</span><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="n">module_engine_name</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">update_engine_attributes</span><span class="p">(</span><span class="n">engine</span><span class="p">:</span> <span class="n">Engine</span><span class="p">,</span> <span class="n">engine_data</span><span class="p">):</span>
<span class="c1"># set engine attributes from engine_data</span>
<span class="k">for</span> <span class="n">param_name</span><span class="p">,</span> <span class="n">param_value</span> <span class="ow">in</span> <span class="n">engine_data</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
<span class="k">if</span> <span class="n">param_name</span> <span class="o">==</span> <span class="s1">&#39;categories&#39;</span><span class="p">:</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">param_value</span><span class="p">,</span> <span class="nb">str</span><span class="p">):</span>
<span class="n">param_value</span> <span class="o">=</span> <span class="nb">list</span><span class="p">(</span><span class="nb">map</span><span class="p">(</span><span class="nb">str</span><span class="o">.</span><span class="n">strip</span><span class="p">,</span> <span class="n">param_value</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s1">&#39;,&#39;</span><span class="p">)))</span>
<span class="n">engine</span><span class="o">.</span><span class="n">categories</span> <span class="o">=</span> <span class="n">param_value</span>
<span class="k">elif</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="s1">&#39;about&#39;</span><span class="p">)</span> <span class="ow">and</span> <span class="n">param_name</span> <span class="o">==</span> <span class="s1">&#39;about&#39;</span><span class="p">:</span>
<span class="n">engine</span><span class="o">.</span><span class="n">about</span> <span class="o">=</span> <span class="p">{</span><span class="o">**</span><span class="n">engine</span><span class="o">.</span><span class="n">about</span><span class="p">,</span> <span class="o">**</span><span class="n">engine_data</span><span class="p">[</span><span class="s1">&#39;about&#39;</span><span class="p">]}</span>
<span class="k">else</span><span class="p">:</span>
<span class="nb">setattr</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="n">param_name</span><span class="p">,</span> <span class="n">param_value</span><span class="p">)</span>
<span class="c1"># set default attributes</span>
<span class="k">for</span> <span class="n">arg_name</span><span class="p">,</span> <span class="n">arg_value</span> <span class="ow">in</span> <span class="n">ENGINE_DEFAULT_ARGS</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="n">arg_name</span><span class="p">):</span>
<span class="nb">setattr</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="n">arg_name</span><span class="p">,</span> <span class="n">copy</span><span class="o">.</span><span class="n">deepcopy</span><span class="p">(</span><span class="n">arg_value</span><span class="p">))</span>
<span class="k">def</span> <span class="nf">set_language_attributes</span><span class="p">(</span><span class="n">engine</span><span class="p">:</span> <span class="n">Engine</span><span class="p">):</span>
<span class="c1"># assign supported languages from json file</span>
<span class="k">if</span> <span class="n">engine</span><span class="o">.</span><span class="n">name</span> <span class="ow">in</span> <span class="n">ENGINES_LANGUAGES</span><span class="p">:</span>
<span class="n">engine</span><span class="o">.</span><span class="n">supported_languages</span> <span class="o">=</span> <span class="n">ENGINES_LANGUAGES</span><span class="p">[</span><span class="n">engine</span><span class="o">.</span><span class="n">name</span><span class="p">]</span>
<span class="k">elif</span> <span class="n">engine</span><span class="o">.</span><span class="n">engine</span> <span class="ow">in</span> <span class="n">ENGINES_LANGUAGES</span><span class="p">:</span>
<span class="c1"># The key of the dictionary ENGINES_LANGUAGES is the *engine name*</span>
<span class="c1"># configured in settings.xml. When multiple engines are configured in</span>
<span class="c1"># settings.yml to use the same origin engine (python module) these</span>
<span class="c1"># additional engines can use the languages from the origin engine.</span>
<span class="c1"># For this use the configured ``engine: ...`` from settings.yml</span>
<span class="n">engine</span><span class="o">.</span><span class="n">supported_languages</span> <span class="o">=</span> <span class="n">ENGINES_LANGUAGES</span><span class="p">[</span><span class="n">engine</span><span class="o">.</span><span class="n">engine</span><span class="p">]</span>
<span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="s1">&#39;language&#39;</span><span class="p">):</span>
<span class="c1"># For an engine, when there is `language: ...` in the YAML settings, the</span>
<span class="c1"># engine supports only one language, in this case</span>
<span class="c1"># engine.supported_languages should contains this value defined in</span>
<span class="c1"># settings.yml</span>
<span class="k">if</span> <span class="n">engine</span><span class="o">.</span><span class="n">language</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">engine</span><span class="o">.</span><span class="n">supported_languages</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span>
<span class="s2">&quot;settings.yml - engine: &#39;</span><span class="si">%s</span><span class="s2">&#39; / language: &#39;</span><span class="si">%s</span><span class="s2">&#39; not supported&quot;</span> <span class="o">%</span> <span class="p">(</span><span class="n">engine</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="n">engine</span><span class="o">.</span><span class="n">language</span><span class="p">)</span>
<span class="p">)</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">engine</span><span class="o">.</span><span class="n">supported_languages</span><span class="p">,</span> <span class="nb">dict</span><span class="p">):</span>
<span class="n">engine</span><span class="o">.</span><span class="n">supported_languages</span> <span class="o">=</span> <span class="p">{</span><span class="n">engine</span><span class="o">.</span><span class="n">language</span><span class="p">:</span> <span class="n">engine</span><span class="o">.</span><span class="n">supported_languages</span><span class="p">[</span><span class="n">engine</span><span class="o">.</span><span class="n">language</span><span class="p">]}</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">engine</span><span class="o">.</span><span class="n">supported_languages</span> <span class="o">=</span> <span class="p">[</span><span class="n">engine</span><span class="o">.</span><span class="n">language</span><span class="p">]</span>
<span class="c1"># find custom aliases for non standard language codes</span>
<span class="k">for</span> <span class="n">engine_lang</span> <span class="ow">in</span> <span class="n">engine</span><span class="o">.</span><span class="n">supported_languages</span><span class="p">:</span>
<span class="n">iso_lang</span> <span class="o">=</span> <span class="n">match_language</span><span class="p">(</span><span class="n">engine_lang</span><span class="p">,</span> <span class="n">BABEL_LANGS</span><span class="p">,</span> <span class="n">fallback</span><span class="o">=</span><span class="kc">None</span><span class="p">)</span>
<span class="k">if</span> <span class="p">(</span>
<span class="n">iso_lang</span>
<span class="ow">and</span> <span class="n">iso_lang</span> <span class="o">!=</span> <span class="n">engine_lang</span>
<span class="ow">and</span> <span class="ow">not</span> <span class="n">engine_lang</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="n">iso_lang</span><span class="p">)</span>
<span class="ow">and</span> <span class="n">iso_lang</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">engine</span><span class="o">.</span><span class="n">supported_languages</span>
<span class="p">):</span>
<span class="n">engine</span><span class="o">.</span><span class="n">language_aliases</span><span class="p">[</span><span class="n">iso_lang</span><span class="p">]</span> <span class="o">=</span> <span class="n">engine_lang</span>
<span class="c1"># language_support</span>
<span class="n">engine</span><span class="o">.</span><span class="n">language_support</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="n">engine</span><span class="o">.</span><span class="n">supported_languages</span><span class="p">)</span> <span class="o">&gt;</span> <span class="mi">0</span>
<span class="c1"># assign language fetching method if auxiliary method exists</span>
<span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="s1">&#39;_fetch_supported_languages&#39;</span><span class="p">):</span>
<span class="n">headers</span> <span class="o">=</span> <span class="p">{</span>
<span class="s1">&#39;User-Agent&#39;</span><span class="p">:</span> <span class="n">gen_useragent</span><span class="p">(),</span>
<span class="s1">&#39;Accept-Language&#39;</span><span class="p">:</span> <span class="s2">&quot;en-US,en;q=0.5&quot;</span><span class="p">,</span> <span class="c1"># bing needs to set the English language</span>
<span class="p">}</span>
<span class="n">engine</span><span class="o">.</span><span class="n">fetch_supported_languages</span> <span class="o">=</span> <span class="p">(</span>
<span class="c1"># pylint: disable=protected-access</span>
<span class="k">lambda</span><span class="p">:</span> <span class="n">engine</span><span class="o">.</span><span class="n">_fetch_supported_languages</span><span class="p">(</span><span class="n">get</span><span class="p">(</span><span class="n">engine</span><span class="o">.</span><span class="n">supported_languages_url</span><span class="p">,</span> <span class="n">headers</span><span class="o">=</span><span class="n">headers</span><span class="p">))</span>
<span class="p">)</span>
<span class="k">def</span> <span class="nf">update_attributes_for_tor</span><span class="p">(</span><span class="n">engine</span><span class="p">:</span> <span class="n">Engine</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">bool</span><span class="p">:</span>
<span class="k">if</span> <span class="n">using_tor_proxy</span><span class="p">(</span><span class="n">engine</span><span class="p">)</span> <span class="ow">and</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="s1">&#39;onion_url&#39;</span><span class="p">):</span>
<span class="n">engine</span><span class="o">.</span><span class="n">search_url</span> <span class="o">=</span> <span class="n">engine</span><span class="o">.</span><span class="n">onion_url</span> <span class="o">+</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="s1">&#39;search_path&#39;</span><span class="p">,</span> <span class="s1">&#39;&#39;</span><span class="p">)</span>
<span class="n">engine</span><span class="o">.</span><span class="n">timeout</span> <span class="o">+=</span> <span class="n">settings</span><span class="p">[</span><span class="s1">&#39;outgoing&#39;</span><span class="p">]</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;extra_proxy_timeout&#39;</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span>
<div class="viewcode-block" id="is_missing_required_attributes"><a class="viewcode-back" href="../../src/searx.engines.html#searx.engines.is_missing_required_attributes">[docs]</a><span class="k">def</span> <span class="nf">is_missing_required_attributes</span><span class="p">(</span><span class="n">engine</span><span class="p">):</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;An attribute is required when its name doesn&#39;t start with ``_`` (underline).</span>
<span class="sd"> Required attributes must not be ``None``.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">missing</span> <span class="o">=</span> <span class="kc">False</span>
<span class="k">for</span> <span class="n">engine_attr</span> <span class="ow">in</span> <span class="nb">dir</span><span class="p">(</span><span class="n">engine</span><span class="p">):</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">engine_attr</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s1">&#39;_&#39;</span><span class="p">)</span> <span class="ow">and</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="n">engine_attr</span><span class="p">)</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s1">&#39;Missing engine config attribute: &quot;</span><span class="si">{0}</span><span class="s1">.</span><span class="si">{1}</span><span class="s1">&quot;&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">engine</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="n">engine_attr</span><span class="p">))</span>
<span class="n">missing</span> <span class="o">=</span> <span class="kc">True</span>
<span class="k">return</span> <span class="n">missing</span></div>
<div class="viewcode-block" id="using_tor_proxy"><a class="viewcode-back" href="../../src/searx.engines.html#searx.engines.using_tor_proxy">[docs]</a><span class="k">def</span> <span class="nf">using_tor_proxy</span><span class="p">(</span><span class="n">engine</span><span class="p">:</span> <span class="n">Engine</span><span class="p">):</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;Return True if the engine configuration declares to use Tor.&quot;&quot;&quot;</span>
<span class="k">return</span> <span class="n">settings</span><span class="p">[</span><span class="s1">&#39;outgoing&#39;</span><span class="p">]</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;using_tor_proxy&#39;</span><span class="p">)</span> <span class="ow">or</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="s1">&#39;using_tor_proxy&#39;</span><span class="p">,</span> <span class="kc">False</span><span class="p">)</span></div>
<span class="k">def</span> <span class="nf">is_engine_active</span><span class="p">(</span><span class="n">engine</span><span class="p">:</span> <span class="n">Engine</span><span class="p">):</span>
<span class="c1"># check if engine is inactive</span>
<span class="k">if</span> <span class="n">engine</span><span class="o">.</span><span class="n">inactive</span> <span class="ow">is</span> <span class="kc">True</span><span class="p">:</span>
<span class="k">return</span> <span class="kc">False</span>
<span class="c1"># exclude onion engines if not using tor</span>
<span class="k">if</span> <span class="s1">&#39;onions&#39;</span> <span class="ow">in</span> <span class="n">engine</span><span class="o">.</span><span class="n">categories</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">using_tor_proxy</span><span class="p">(</span><span class="n">engine</span><span class="p">):</span>
<span class="k">return</span> <span class="kc">False</span>
<span class="k">return</span> <span class="kc">True</span>
<span class="k">def</span> <span class="nf">register_engine</span><span class="p">(</span><span class="n">engine</span><span class="p">:</span> <span class="n">Engine</span><span class="p">):</span>
<span class="k">if</span> <span class="n">engine</span><span class="o">.</span><span class="n">name</span> <span class="ow">in</span> <span class="n">engines</span><span class="p">:</span>
<span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s1">&#39;Engine config error: ambiguous name: </span><span class="si">{0}</span><span class="s1">&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">engine</span><span class="o">.</span><span class="n">name</span><span class="p">))</span>
<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>
<span class="n">engines</span><span class="p">[</span><span class="n">engine</span><span class="o">.</span><span class="n">name</span><span class="p">]</span> <span class="o">=</span> <span class="n">engine</span>
<span class="k">if</span> <span class="n">engine</span><span class="o">.</span><span class="n">shortcut</span> <span class="ow">in</span> <span class="n">engine_shortcuts</span><span class="p">:</span>
<span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s1">&#39;Engine config error: ambiguous shortcut: </span><span class="si">{0}</span><span class="s1">&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">engine</span><span class="o">.</span><span class="n">shortcut</span><span class="p">))</span>
<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>
<span class="n">engine_shortcuts</span><span class="p">[</span><span class="n">engine</span><span class="o">.</span><span class="n">shortcut</span><span class="p">]</span> <span class="o">=</span> <span class="n">engine</span><span class="o">.</span><span class="n">name</span>
<span class="k">for</span> <span class="n">category_name</span> <span class="ow">in</span> <span class="n">engine</span><span class="o">.</span><span class="n">categories</span><span class="p">:</span>
<span class="n">categories</span><span class="o">.</span><span class="n">setdefault</span><span class="p">(</span><span class="n">category_name</span><span class="p">,</span> <span class="p">[])</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">engine</span><span class="p">)</span>
<div class="viewcode-block" id="load_engines"><a class="viewcode-back" href="../../src/searx.engines.html#searx.engines.load_engines">[docs]</a><span class="k">def</span> <span class="nf">load_engines</span><span class="p">(</span><span class="n">engine_list</span><span class="p">):</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;usage: ``engine_list = settings[&#39;engines&#39;]``&quot;&quot;&quot;</span>
<span class="n">engines</span><span class="o">.</span><span class="n">clear</span><span class="p">()</span>
<span class="n">engine_shortcuts</span><span class="o">.</span><span class="n">clear</span><span class="p">()</span>
<span class="n">categories</span><span class="o">.</span><span class="n">clear</span><span class="p">()</span>
<span class="n">categories</span><span class="p">[</span><span class="s1">&#39;general&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">for</span> <span class="n">engine_data</span> <span class="ow">in</span> <span class="n">engine_list</span><span class="p">:</span>
<span class="n">engine</span> <span class="o">=</span> <span class="n">load_engine</span><span class="p">(</span><span class="n">engine_data</span><span class="p">)</span>
<span class="k">if</span> <span class="n">engine</span><span class="p">:</span>
<span class="n">register_engine</span><span class="p">(</span><span class="n">engine</span><span class="p">)</span>
<span class="k">return</span> <span class="n">engines</span></div>
</pre></div>
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