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<h1>Source code for searxng_extra.update.update_external_bangs</h1><div class="highlight"><pre>
<span></span><span class="ch">#!/usr/bin/env python</span>
<span class="c1"># lint: pylint</span>
<span class="c1"># SPDX-License-Identifier: AGPL-3.0-or-later</span>
<span class="sd">&quot;&quot;&quot;Update :origin:`searx/data/external_bangs.json` using the duckduckgo bangs</span>
<span class="sd">(:origin:`CI Update data ... &lt;.github/workflows/data-update.yml&gt;`).</span>
<span class="sd">https://duckduckgo.com/newbang loads:</span>
<span class="sd">* a javascript which provides the bang version ( https://duckduckgo.com/bv1.js )</span>
<span class="sd">* a JSON file which contains the bangs ( https://duckduckgo.com/bang.v260.js for example )</span>
<span class="sd">This script loads the javascript, then the bangs.</span>
<span class="sd">The javascript URL may change in the future ( for example</span>
<span class="sd">https://duckduckgo.com/bv2.js ), but most probably it will requires to update</span>
<span class="sd">RE_BANG_VERSION</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="c1"># pylint: disable=C0116</span>
<span class="kn">import</span> <span class="nn">json</span>
<span class="kn">import</span> <span class="nn">re</span>
<span class="kn">from</span> <span class="nn">os.path</span> <span class="kn">import</span> <span class="n">join</span>
<span class="kn">import</span> <span class="nn">httpx</span>
<span class="kn">from</span> <span class="nn">searx</span> <span class="kn">import</span> <span class="n">searx_dir</span> <span class="c1"># pylint: disable=E0401 C0413</span>
<span class="kn">from</span> <span class="nn">searx.external_bang</span> <span class="kn">import</span> <span class="n">LEAF_KEY</span>
<span class="c1"># from https://duckduckgo.com/newbang</span>
<span class="n">URL_BV1</span> <span class="o">=</span> <span class="s1">&#39;https://duckduckgo.com/bv1.js&#39;</span>
<span class="n">RE_BANG_VERSION</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span><span class="sa">r</span><span class="s1">&#39;\/bang\.v([0-9]+)\.js&#39;</span><span class="p">)</span>
<span class="n">HTTPS_COLON</span> <span class="o">=</span> <span class="s1">&#39;https:&#39;</span>
<span class="n">HTTP_COLON</span> <span class="o">=</span> <span class="s1">&#39;http:&#39;</span>
<span class="k">def</span> <span class="nf">get_bang_url</span><span class="p">():</span>
<span class="n">response</span> <span class="o">=</span> <span class="n">httpx</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">URL_BV1</span><span class="p">)</span>
<span class="n">response</span><span class="o">.</span><span class="n">raise_for_status</span><span class="p">()</span>
<span class="n">r</span> <span class="o">=</span> <span class="n">RE_BANG_VERSION</span><span class="o">.</span><span class="n">findall</span><span class="p">(</span><span class="n">response</span><span class="o">.</span><span class="n">text</span><span class="p">)</span>
<span class="k">return</span> <span class="sa">f</span><span class="s1">&#39;https://duckduckgo.com/bang.v</span><span class="si">{</span><span class="n">r</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="si">}</span><span class="s1">.js&#39;</span><span class="p">,</span> <span class="n">r</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="k">def</span> <span class="nf">fetch_ddg_bangs</span><span class="p">(</span><span class="n">url</span><span class="p">):</span>
<span class="n">response</span> <span class="o">=</span> <span class="n">httpx</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">url</span><span class="p">)</span>
<span class="n">response</span><span class="o">.</span><span class="n">raise_for_status</span><span class="p">()</span>
<span class="k">return</span> <span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="n">response</span><span class="o">.</span><span class="n">content</span><span class="o">.</span><span class="n">decode</span><span class="p">())</span>
<div class="viewcode-block" id="merge_when_no_leaf">
<a class="viewcode-back" href="../../../dev/searxng_extra/update.html#searxng_extra.update.update_external_bangs.merge_when_no_leaf">[docs]</a>
<span class="k">def</span> <span class="nf">merge_when_no_leaf</span><span class="p">(</span><span class="n">node</span><span class="p">):</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;Minimize the number of nodes</span>
<span class="sd"> ``A -&gt; B -&gt; C``</span>
<span class="sd"> - ``B`` is child of ``A``</span>
<span class="sd"> - ``C`` is child of ``B``</span>
<span class="sd"> If there are no ``C`` equals to ``&lt;LEAF_KEY&gt;``, then each ``C`` are merged</span>
<span class="sd"> into ``A``. For example (5 nodes)::</span>
<span class="sd"> d -&gt; d -&gt; g -&gt; &lt;LEAF_KEY&gt; (ddg)</span>
<span class="sd"> -&gt; i -&gt; g -&gt; &lt;LEAF_KEY&gt; (dig)</span>
<span class="sd"> becomes (3 nodes)::</span>
<span class="sd"> d -&gt; dg -&gt; &lt;LEAF_KEY&gt;</span>
<span class="sd"> -&gt; ig -&gt; &lt;LEAF_KEY&gt;</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">restart</span> <span class="o">=</span> <span class="kc">False</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="nb">dict</span><span class="p">):</span>
<span class="k">return</span>
<span class="c1"># create a copy of the keys so node can be modified</span>
<span class="n">keys</span> <span class="o">=</span> <span class="nb">list</span><span class="p">(</span><span class="n">node</span><span class="o">.</span><span class="n">keys</span><span class="p">())</span>
<span class="k">for</span> <span class="n">key</span> <span class="ow">in</span> <span class="n">keys</span><span class="p">:</span>
<span class="k">if</span> <span class="n">key</span> <span class="o">==</span> <span class="n">LEAF_KEY</span><span class="p">:</span>
<span class="k">continue</span>
<span class="n">value</span> <span class="o">=</span> <span class="n">node</span><span class="p">[</span><span class="n">key</span><span class="p">]</span>
<span class="n">value_keys</span> <span class="o">=</span> <span class="nb">list</span><span class="p">(</span><span class="n">value</span><span class="o">.</span><span class="n">keys</span><span class="p">())</span>
<span class="k">if</span> <span class="n">LEAF_KEY</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">value_keys</span><span class="p">:</span>
<span class="k">for</span> <span class="n">value_key</span> <span class="ow">in</span> <span class="n">value_keys</span><span class="p">:</span>
<span class="n">node</span><span class="p">[</span><span class="n">key</span> <span class="o">+</span> <span class="n">value_key</span><span class="p">]</span> <span class="o">=</span> <span class="n">value</span><span class="p">[</span><span class="n">value_key</span><span class="p">]</span>
<span class="n">merge_when_no_leaf</span><span class="p">(</span><span class="n">node</span><span class="p">[</span><span class="n">key</span> <span class="o">+</span> <span class="n">value_key</span><span class="p">])</span>
<span class="k">del</span> <span class="n">node</span><span class="p">[</span><span class="n">key</span><span class="p">]</span>
<span class="n">restart</span> <span class="o">=</span> <span class="kc">True</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">merge_when_no_leaf</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">if</span> <span class="n">restart</span><span class="p">:</span>
<span class="n">merge_when_no_leaf</span><span class="p">(</span><span class="n">node</span><span class="p">)</span></div>
<span class="k">def</span> <span class="nf">optimize_leaf</span><span class="p">(</span><span class="n">parent</span><span class="p">,</span> <span class="n">parent_key</span><span class="p">,</span> <span class="n">node</span><span class="p">):</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="nb">dict</span><span class="p">):</span>
<span class="k">return</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">node</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span> <span class="ow">and</span> <span class="n">LEAF_KEY</span> <span class="ow">in</span> <span class="n">node</span> <span class="ow">and</span> <span class="n">parent</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">parent</span><span class="p">[</span><span class="n">parent_key</span><span class="p">]</span> <span class="o">=</span> <span class="n">node</span><span class="p">[</span><span class="n">LEAF_KEY</span><span class="p">]</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">for</span> <span class="n">key</span><span class="p">,</span> <span class="n">value</span> <span class="ow">in</span> <span class="n">node</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
<span class="n">optimize_leaf</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">key</span><span class="p">,</span> <span class="n">value</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">parse_ddg_bangs</span><span class="p">(</span><span class="n">ddg_bangs</span><span class="p">):</span>
<span class="n">bang_trie</span> <span class="o">=</span> <span class="p">{}</span>
<span class="n">bang_urls</span> <span class="o">=</span> <span class="p">{}</span>
<span class="k">for</span> <span class="n">bang_definition</span> <span class="ow">in</span> <span class="n">ddg_bangs</span><span class="p">:</span>
<span class="c1"># bang_list</span>
<span class="n">bang_url</span> <span class="o">=</span> <span class="n">bang_definition</span><span class="p">[</span><span class="s1">&#39;u&#39;</span><span class="p">]</span>
<span class="k">if</span> <span class="s1">&#39;{{</span><span class="si">{s}</span><span class="s1">}}&#39;</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">bang_url</span><span class="p">:</span>
<span class="c1"># ignore invalid bang</span>
<span class="k">continue</span>
<span class="n">bang_url</span> <span class="o">=</span> <span class="n">bang_url</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="s1">&#39;{{</span><span class="si">{s}</span><span class="s1">}}&#39;</span><span class="p">,</span> <span class="nb">chr</span><span class="p">(</span><span class="mi">2</span><span class="p">))</span>
<span class="c1"># only for the https protocol: &quot;https://example.com&quot; becomes &quot;//example.com&quot;</span>
<span class="k">if</span> <span class="n">bang_url</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="n">HTTPS_COLON</span> <span class="o">+</span> <span class="s1">&#39;//&#39;</span><span class="p">):</span>
<span class="n">bang_url</span> <span class="o">=</span> <span class="n">bang_url</span><span class="p">[</span><span class="nb">len</span><span class="p">(</span><span class="n">HTTPS_COLON</span><span class="p">)</span> <span class="p">:]</span>
<span class="c1">#</span>
<span class="k">if</span> <span class="n">bang_url</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="n">HTTP_COLON</span> <span class="o">+</span> <span class="s1">&#39;//&#39;</span><span class="p">)</span> <span class="ow">and</span> <span class="n">bang_url</span><span class="p">[</span><span class="nb">len</span><span class="p">(</span><span class="n">HTTP_COLON</span><span class="p">)</span> <span class="p">:]</span> <span class="ow">in</span> <span class="n">bang_urls</span><span class="p">:</span>
<span class="c1"># if the bang_url uses the http:// protocol, and the same URL exists in https://</span>
<span class="c1"># then reuse the https:// bang definition. (written //example.com)</span>
<span class="n">bang_def_output</span> <span class="o">=</span> <span class="n">bang_urls</span><span class="p">[</span><span class="n">bang_url</span><span class="p">[</span><span class="nb">len</span><span class="p">(</span><span class="n">HTTP_COLON</span><span class="p">)</span> <span class="p">:]]</span>
<span class="k">else</span><span class="p">:</span>
<span class="c1"># normal use case : new http:// URL or https:// URL (without &quot;https:&quot;, see above)</span>
<span class="n">bang_rank</span> <span class="o">=</span> <span class="nb">str</span><span class="p">(</span><span class="n">bang_definition</span><span class="p">[</span><span class="s1">&#39;r&#39;</span><span class="p">])</span>
<span class="n">bang_def_output</span> <span class="o">=</span> <span class="n">bang_url</span> <span class="o">+</span> <span class="nb">chr</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span> <span class="o">+</span> <span class="n">bang_rank</span>
<span class="n">bang_def_output</span> <span class="o">=</span> <span class="n">bang_urls</span><span class="o">.</span><span class="n">setdefault</span><span class="p">(</span><span class="n">bang_url</span><span class="p">,</span> <span class="n">bang_def_output</span><span class="p">)</span>
<span class="n">bang_urls</span><span class="p">[</span><span class="n">bang_url</span><span class="p">]</span> <span class="o">=</span> <span class="n">bang_def_output</span>
<span class="c1"># bang name</span>
<span class="n">bang</span> <span class="o">=</span> <span class="n">bang_definition</span><span class="p">[</span><span class="s1">&#39;t&#39;</span><span class="p">]</span>
<span class="c1"># bang_trie</span>
<span class="n">t</span> <span class="o">=</span> <span class="n">bang_trie</span>
<span class="k">for</span> <span class="n">bang_letter</span> <span class="ow">in</span> <span class="n">bang</span><span class="p">:</span>
<span class="n">t</span> <span class="o">=</span> <span class="n">t</span><span class="o">.</span><span class="n">setdefault</span><span class="p">(</span><span class="n">bang_letter</span><span class="p">,</span> <span class="p">{})</span>
<span class="n">t</span> <span class="o">=</span> <span class="n">t</span><span class="o">.</span><span class="n">setdefault</span><span class="p">(</span><span class="n">LEAF_KEY</span><span class="p">,</span> <span class="n">bang_def_output</span><span class="p">)</span>
<span class="c1"># optimize the trie</span>
<span class="n">merge_when_no_leaf</span><span class="p">(</span><span class="n">bang_trie</span><span class="p">)</span>
<span class="n">optimize_leaf</span><span class="p">(</span><span class="kc">None</span><span class="p">,</span> <span class="kc">None</span><span class="p">,</span> <span class="n">bang_trie</span><span class="p">)</span>
<span class="k">return</span> <span class="n">bang_trie</span>
<span class="k">def</span> <span class="nf">get_bangs_filename</span><span class="p">():</span>
<span class="k">return</span> <span class="n">join</span><span class="p">(</span><span class="n">join</span><span class="p">(</span><span class="n">searx_dir</span><span class="p">,</span> <span class="s2">&quot;data&quot;</span><span class="p">),</span> <span class="s2">&quot;external_bangs.json&quot;</span><span class="p">)</span>
<span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s1">&#39;__main__&#39;</span><span class="p">:</span>
<span class="n">bangs_url</span><span class="p">,</span> <span class="n">bangs_version</span> <span class="o">=</span> <span class="n">get_bang_url</span><span class="p">()</span>
<span class="nb">print</span><span class="p">(</span><span class="sa">f</span><span class="s1">&#39;fetch bangs from </span><span class="si">{</span><span class="n">bangs_url</span><span class="si">}</span><span class="s1">&#39;</span><span class="p">)</span>
<span class="n">output</span> <span class="o">=</span> <span class="p">{</span><span class="s1">&#39;version&#39;</span><span class="p">:</span> <span class="n">bangs_version</span><span class="p">,</span> <span class="s1">&#39;trie&#39;</span><span class="p">:</span> <span class="n">parse_ddg_bangs</span><span class="p">(</span><span class="n">fetch_ddg_bangs</span><span class="p">(</span><span class="n">bangs_url</span><span class="p">))}</span>
<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">get_bangs_filename</span><span class="p">(),</span> <span class="s1">&#39;w&#39;</span><span class="p">,</span> <span class="n">encoding</span><span class="o">=</span><span class="s2">&quot;utf8&quot;</span><span class="p">)</span> <span class="k">as</span> <span class="n">fp</span><span class="p">:</span>
<span class="n">json</span><span class="o">.</span><span class="n">dump</span><span class="p">(</span><span class="n">output</span><span class="p">,</span> <span class="n">fp</span><span class="p">,</span> <span class="n">ensure_ascii</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="n">indent</span><span class="o">=</span><span class="mi">4</span><span class="p">)</span>
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