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<h1>Source code for searx.favicons.proxy</h1><div class="highlight"><pre>
<span></span><span class="c1"># SPDX-License-Identifier: AGPL-3.0-or-later</span>
<span class="sd">"""Implementations for a favicon proxy"""</span>
<span class="kn">from</span> <span class="nn">__future__</span> <span class="kn">import</span> <span class="n">annotations</span>
<span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">Callable</span>
<span class="kn">import</span> <span class="nn">importlib</span>
<span class="kn">import</span> <span class="nn">base64</span>
<span class="kn">import</span> <span class="nn">pathlib</span>
<span class="kn">import</span> <span class="nn">urllib.parse</span>
<span class="kn">import</span> <span class="nn">flask</span>
<span class="kn">from</span> <span class="nn">httpx</span> <span class="kn">import</span> <span class="n">HTTPError</span>
<span class="kn">import</span> <span class="nn">msgspec</span>
<span class="kn">from</span> <span class="nn">searx</span> <span class="kn">import</span> <span class="n">get_setting</span>
<span class="kn">from</span> <span class="nn">searx.webutils</span> <span class="kn">import</span> <span class="n">new_hmac</span><span class="p">,</span> <span class="n">is_hmac_of</span>
<span class="kn">from</span> <span class="nn">searx.exceptions</span> <span class="kn">import</span> <span class="n">SearxEngineResponseException</span>
<span class="kn">from</span> <span class="nn">.resolvers</span> <span class="kn">import</span> <span class="n">DEFAULT_RESOLVER_MAP</span>
<span class="kn">from</span> <span class="nn">.</span> <span class="kn">import</span> <span class="n">cache</span>
<span class="n">DEFAULT_FAVICON_URL</span> <span class="o">=</span> <span class="p">{}</span>
<span class="n">CFG</span><span class="p">:</span> <span class="n">FaviconProxyConfig</span> <span class="o">=</span> <span class="kc">None</span> <span class="c1"># type: ignore</span>
<span class="k">def</span> <span class="nf">init</span><span class="p">(</span><span class="n">cfg</span><span class="p">:</span> <span class="n">FaviconProxyConfig</span><span class="p">):</span>
<span class="k">global</span> <span class="n">CFG</span> <span class="c1"># pylint: disable=global-statement</span>
<span class="n">CFG</span> <span class="o">=</span> <span class="n">cfg</span>
<span class="k">def</span> <span class="nf">_initial_resolver_map</span><span class="p">():</span>
<span class="n">d</span> <span class="o">=</span> <span class="p">{}</span>
<span class="n">name</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="n">get_setting</span><span class="p">(</span><span class="s2">"search.favicon_resolver"</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span> <span class="c1"># type: ignore</span>
<span class="k">if</span> <span class="n">name</span><span class="p">:</span>
<span class="n">func</span> <span class="o">=</span> <span class="n">DEFAULT_RESOLVER_MAP</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">name</span><span class="p">)</span>
<span class="k">if</span> <span class="n">func</span><span class="p">:</span>
<span class="n">d</span> <span class="o">=</span> <span class="p">{</span><span class="n">name</span><span class="p">:</span> <span class="sa">f</span><span class="s2">"searx.favicons.resolvers.</span><span class="si">{</span><span class="n">func</span><span class="o">.</span><span class="vm">__name__</span><span class="si">}</span><span class="s2">"</span><span class="p">}</span>
<span class="k">return</span> <span class="n">d</span>
<div class="viewcode-block" id="FaviconProxyConfig">
<a class="viewcode-back" href="../../../src/searx.favicons.html#searx.favicons.FaviconProxyConfig">[docs]</a>
<span class="k">class</span> <span class="nc">FaviconProxyConfig</span><span class="p">(</span><span class="n">msgspec</span><span class="o">.</span><span class="n">Struct</span><span class="p">):</span>
<span class="w"> </span><span class="sd">"""Configuration of the favicon proxy."""</span>
<span class="n">max_age</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">60</span> <span class="o">*</span> <span class="mi">60</span> <span class="o">*</span> <span class="mi">24</span> <span class="o">*</span> <span class="mi">7</span> <span class="c1"># seven days</span>
<span class="w"> </span><span class="sd">"""HTTP header Cache-Control_ ``max-age``</span>
<span class="sd"> .. _Cache-Control: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control</span>
<span class="sd"> """</span>
<span class="n">secret_key</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="n">get_setting</span><span class="p">(</span><span class="s2">"server.secret_key"</span><span class="p">)</span> <span class="c1"># type: ignore</span>
<span class="w"> </span><span class="sd">"""By default, the value from :ref:`server.secret_key <settings server>`</span>
<span class="sd"> setting is used."""</span>
<span class="n">resolver_timeout</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="n">get_setting</span><span class="p">(</span><span class="s2">"outgoing.request_timeout"</span><span class="p">)</span> <span class="c1"># type: ignore</span>
<span class="w"> </span><span class="sd">"""Timeout which the resolvers should not exceed, is usually passed to the</span>
<span class="sd"> outgoing request of the resolver. By default, the value from</span>
<span class="sd"> :ref:`outgoing.request_timeout <settings outgoing>` setting is used."""</span>
<span class="n">resolver_map</span><span class="p">:</span> <span class="nb">dict</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="n">msgspec</span><span class="o">.</span><span class="n">field</span><span class="p">(</span><span class="n">default_factory</span><span class="o">=</span><span class="n">_initial_resolver_map</span><span class="p">)</span>
<span class="w"> </span><span class="sd">"""The resolver_map is a key / value dictionary where the key is the name of</span>
<span class="sd"> the resolver and the value is the fully qualifying name (fqn) of resolver's</span>
<span class="sd"> function (the callable). The resolvers from the python module</span>
<span class="sd"> :py:obj:`searx.favicons.resolver` are available by default."""</span>
<div class="viewcode-block" id="FaviconProxyConfig.get_resolver">
<a class="viewcode-back" href="../../../src/searx.favicons.html#searx.favicons.FaviconProxyConfig.get_resolver">[docs]</a>
<span class="k">def</span> <span class="nf">get_resolver</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">:</span> <span class="nb">str</span><span class="p">)</span> <span class="o">-></span> <span class="n">Callable</span> <span class="o">|</span> <span class="kc">None</span><span class="p">:</span>
<span class="w"> </span><span class="sd">"""Returns the callable object (function) of the resolver with the</span>
<span class="sd"> ``name``. If no resolver is registered for the ``name``, ``None`` is</span>
<span class="sd"> returned.</span>
<span class="sd"> """</span>
<span class="n">fqn</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">resolver_map</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">name</span><span class="p">)</span>
<span class="k">if</span> <span class="n">fqn</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span> <span class="kc">None</span>
<span class="n">mod_name</span><span class="p">,</span> <span class="n">_</span><span class="p">,</span> <span class="n">func_name</span> <span class="o">=</span> <span class="n">fqn</span><span class="o">.</span><span class="n">rpartition</span><span class="p">(</span><span class="s1">'.'</span><span class="p">)</span>
<span class="n">mod</span> <span class="o">=</span> <span class="n">importlib</span><span class="o">.</span><span class="n">import_module</span><span class="p">(</span><span class="n">mod_name</span><span class="p">)</span>
<span class="n">func</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">mod</span><span class="p">,</span> <span class="n">func_name</span><span class="p">)</span>
<span class="k">if</span> <span class="n">func</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="sa">f</span><span class="s2">"resolver </span><span class="si">{</span><span class="n">fqn</span><span class="si">}</span><span class="s2"> is not implemented"</span><span class="p">)</span>
<span class="k">return</span> <span class="n">func</span></div>
<span class="n">favicon_path</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="n">get_setting</span><span class="p">(</span><span class="s2">"ui.static_path"</span><span class="p">)</span> <span class="o">+</span> <span class="s2">"/themes/</span><span class="si">{theme}</span><span class="s2">/img/empty_favicon.svg"</span> <span class="c1"># type: ignore</span>
<span class="n">favicon_mime_type</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="s2">"image/svg+xml"</span>
<div class="viewcode-block" id="FaviconProxyConfig.favicon">
<a class="viewcode-back" href="../../../src/searx.favicons.html#searx.favicons.FaviconProxyConfig.favicon">[docs]</a>
<span class="k">def</span> <span class="nf">favicon</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">**</span><span class="n">replacements</span><span class="p">):</span>
<span class="w"> </span><span class="sd">"""Returns pathname and mimetype of the default favicon."""</span>
<span class="k">return</span> <span class="p">(</span>
<span class="n">pathlib</span><span class="o">.</span><span class="n">Path</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">favicon_path</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="o">**</span><span class="n">replacements</span><span class="p">)),</span>
<span class="bp">self</span><span class="o">.</span><span class="n">favicon_mime_type</span><span class="p">,</span>
<span class="p">)</span></div>
<div class="viewcode-block" id="FaviconProxyConfig.favicon_data_url">
<a class="viewcode-back" href="../../../src/searx.favicons.html#searx.favicons.FaviconProxyConfig.favicon_data_url">[docs]</a>
<span class="k">def</span> <span class="nf">favicon_data_url</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">**</span><span class="n">replacements</span><span class="p">):</span>
<span class="w"> </span><span class="sd">"""Returns data image URL of the default favicon."""</span>
<span class="n">cache_key</span> <span class="o">=</span> <span class="s2">", "</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="sa">f</span><span class="s2">"</span><span class="si">{</span><span class="n">x</span><span class="si">}</span><span class="s2">:</span><span class="si">{</span><span class="n">replacements</span><span class="p">[</span><span class="n">x</span><span class="p">]</span><span class="si">}</span><span class="s2">"</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="nb">sorted</span><span class="p">(</span><span class="nb">list</span><span class="p">(</span><span class="n">replacements</span><span class="o">.</span><span class="n">keys</span><span class="p">()),</span> <span class="n">key</span><span class="o">=</span><span class="nb">str</span><span class="p">))</span>
<span class="n">data_url</span> <span class="o">=</span> <span class="n">DEFAULT_FAVICON_URL</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">cache_key</span><span class="p">)</span>
<span class="k">if</span> <span class="n">data_url</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span> <span class="n">data_url</span>
<span class="n">fav</span><span class="p">,</span> <span class="n">mimetype</span> <span class="o">=</span> <span class="n">CFG</span><span class="o">.</span><span class="n">favicon</span><span class="p">(</span><span class="o">**</span><span class="n">replacements</span><span class="p">)</span>
<span class="c1"># hint: encoding utf-8 limits favicons to be a SVG image</span>
<span class="k">with</span> <span class="n">fav</span><span class="o">.</span><span class="n">open</span><span class="p">(</span><span class="s2">"r"</span><span class="p">,</span> <span class="n">encoding</span><span class="o">=</span><span class="s2">"utf-8"</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
<span class="n">data_url</span> <span class="o">=</span> <span class="n">f</span><span class="o">.</span><span class="n">read</span><span class="p">()</span>
<span class="n">data_url</span> <span class="o">=</span> <span class="n">urllib</span><span class="o">.</span><span class="n">parse</span><span class="o">.</span><span class="n">quote</span><span class="p">(</span><span class="n">data_url</span><span class="p">)</span>
<span class="n">data_url</span> <span class="o">=</span> <span class="sa">f</span><span class="s2">"data:</span><span class="si">{</span><span class="n">mimetype</span><span class="si">}</span><span class="s2">;utf8,</span><span class="si">{</span><span class="n">data_url</span><span class="si">}</span><span class="s2">"</span>
<span class="n">DEFAULT_FAVICON_URL</span><span class="p">[</span><span class="n">cache_key</span><span class="p">]</span> <span class="o">=</span> <span class="n">data_url</span>
<span class="k">return</span> <span class="n">data_url</span></div>
</div>
<div class="viewcode-block" id="favicon_proxy">
<a class="viewcode-back" href="../../../src/searx.favicons.html#searx.favicons.favicon_proxy">[docs]</a>
<span class="k">def</span> <span class="nf">favicon_proxy</span><span class="p">():</span>
<span class="w"> </span><span class="sd">"""REST API of SearXNG's favicon proxy service</span>
<span class="sd"> ::</span>
<span class="sd"> /favicon_proxy?authority=<...>&h=<...></span>
<span class="sd"> ``authority``:</span>
<span class="sd"> Domain name :rfc:`3986` / see :py:obj:`favicon_url`</span>
<span class="sd"> ``h``:</span>
<span class="sd"> HMAC :rfc:`2104`, build up from the :ref:`server.secret_key <settings</span>
<span class="sd"> server>` setting.</span>
<span class="sd"> """</span>
<span class="n">authority</span> <span class="o">=</span> <span class="n">flask</span><span class="o">.</span><span class="n">request</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'authority'</span><span class="p">)</span>
<span class="c1"># malformed request or RFC 3986 authority</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">authority</span> <span class="ow">or</span> <span class="s2">"/"</span> <span class="ow">in</span> <span class="n">authority</span><span class="p">:</span>
<span class="k">return</span> <span class="s1">''</span><span class="p">,</span> <span class="mi">400</span>
<span class="c1"># malformed request / does not have authorisation</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">is_hmac_of</span><span class="p">(</span>
<span class="n">CFG</span><span class="o">.</span><span class="n">secret_key</span><span class="p">,</span>
<span class="n">authority</span><span class="o">.</span><span class="n">encode</span><span class="p">(),</span>
<span class="n">flask</span><span class="o">.</span><span class="n">request</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'h'</span><span class="p">,</span> <span class="s1">''</span><span class="p">),</span>
<span class="p">):</span>
<span class="k">return</span> <span class="s1">''</span><span class="p">,</span> <span class="mi">400</span>
<span class="n">resolver</span> <span class="o">=</span> <span class="n">flask</span><span class="o">.</span><span class="n">request</span><span class="o">.</span><span class="n">preferences</span><span class="o">.</span><span class="n">get_value</span><span class="p">(</span><span class="s1">'favicon_resolver'</span><span class="p">)</span> <span class="c1"># type: ignore</span>
<span class="c1"># if resolver is empty or not valid, just return HTTP 400.</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">resolver</span> <span class="ow">or</span> <span class="n">resolver</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">CFG</span><span class="o">.</span><span class="n">resolver_map</span><span class="o">.</span><span class="n">keys</span><span class="p">():</span>
<span class="k">return</span> <span class="s2">""</span><span class="p">,</span> <span class="mi">400</span>
<span class="n">data</span><span class="p">,</span> <span class="n">mime</span> <span class="o">=</span> <span class="n">search_favicon</span><span class="p">(</span><span class="n">resolver</span><span class="p">,</span> <span class="n">authority</span><span class="p">)</span>
<span class="k">if</span> <span class="n">data</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span> <span class="ow">and</span> <span class="n">mime</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">resp</span> <span class="o">=</span> <span class="n">flask</span><span class="o">.</span><span class="n">Response</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="n">mimetype</span><span class="o">=</span><span class="n">mime</span><span class="p">)</span> <span class="c1"># type: ignore</span>
<span class="n">resp</span><span class="o">.</span><span class="n">headers</span><span class="p">[</span><span class="s1">'Cache-Control'</span><span class="p">]</span> <span class="o">=</span> <span class="sa">f</span><span class="s2">"max-age=</span><span class="si">{</span><span class="n">CFG</span><span class="o">.</span><span class="n">max_age</span><span class="si">}</span><span class="s2">"</span>
<span class="k">return</span> <span class="n">resp</span>
<span class="c1"># return default favicon from static path</span>
<span class="n">theme</span> <span class="o">=</span> <span class="n">flask</span><span class="o">.</span><span class="n">request</span><span class="o">.</span><span class="n">preferences</span><span class="o">.</span><span class="n">get_value</span><span class="p">(</span><span class="s2">"theme"</span><span class="p">)</span> <span class="c1"># type: ignore</span>
<span class="n">fav</span><span class="p">,</span> <span class="n">mimetype</span> <span class="o">=</span> <span class="n">CFG</span><span class="o">.</span><span class="n">favicon</span><span class="p">(</span><span class="n">theme</span><span class="o">=</span><span class="n">theme</span><span class="p">)</span>
<span class="k">return</span> <span class="n">flask</span><span class="o">.</span><span class="n">send_from_directory</span><span class="p">(</span><span class="n">fav</span><span class="o">.</span><span class="n">parent</span><span class="p">,</span> <span class="n">fav</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="n">mimetype</span><span class="o">=</span><span class="n">mimetype</span><span class="p">)</span></div>
<div class="viewcode-block" id="search_favicon">
<a class="viewcode-back" href="../../../src/searx.favicons.html#searx.favicons.search_favicon">[docs]</a>
<span class="k">def</span> <span class="nf">search_favicon</span><span class="p">(</span><span class="n">resolver</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">authority</span><span class="p">:</span> <span class="nb">str</span><span class="p">)</span> <span class="o">-></span> <span class="nb">tuple</span><span class="p">[</span><span class="kc">None</span> <span class="o">|</span> <span class="nb">bytes</span><span class="p">,</span> <span class="kc">None</span> <span class="o">|</span> <span class="nb">str</span><span class="p">]:</span>
<span class="w"> </span><span class="sd">"""Sends the request to the favicon resolver and returns a tuple for the</span>
<span class="sd"> favicon. The tuple consists of ``(data, mime)``, if the resolver has not</span>
<span class="sd"> determined a favicon, both values are ``None``.</span>
<span class="sd"> ``data``:</span>
<span class="sd"> Binary data of the favicon.</span>
<span class="sd"> ``mime``:</span>
<span class="sd"> Mime type of the favicon.</span>
<span class="sd"> """</span>
<span class="n">data</span><span class="p">,</span> <span class="n">mime</span> <span class="o">=</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">func</span> <span class="o">=</span> <span class="n">CFG</span><span class="o">.</span><span class="n">get_resolver</span><span class="p">(</span><span class="n">resolver</span><span class="p">)</span>
<span class="k">if</span> <span class="n">func</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span> <span class="n">data</span><span class="p">,</span> <span class="n">mime</span>
<span class="c1"># to avoid superfluous requests to the resolver, first look in the cache</span>
<span class="n">data_mime</span> <span class="o">=</span> <span class="n">cache</span><span class="o">.</span><span class="n">CACHE</span><span class="p">(</span><span class="n">resolver</span><span class="p">,</span> <span class="n">authority</span><span class="p">)</span>
<span class="k">if</span> <span class="n">data_mime</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span> <span class="n">data_mime</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">data</span><span class="p">,</span> <span class="n">mime</span> <span class="o">=</span> <span class="n">func</span><span class="p">(</span><span class="n">authority</span><span class="p">,</span> <span class="n">timeout</span><span class="o">=</span><span class="n">CFG</span><span class="o">.</span><span class="n">resolver_timeout</span><span class="p">)</span>
<span class="k">if</span> <span class="n">data</span> <span class="ow">is</span> <span class="kc">None</span> <span class="ow">or</span> <span class="n">mime</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">data</span><span class="p">,</span> <span class="n">mime</span> <span class="o">=</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="k">except</span> <span class="p">(</span><span class="n">HTTPError</span><span class="p">,</span> <span class="n">SearxEngineResponseException</span><span class="p">):</span>
<span class="k">pass</span>
<span class="n">cache</span><span class="o">.</span><span class="n">CACHE</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="n">resolver</span><span class="p">,</span> <span class="n">authority</span><span class="p">,</span> <span class="n">mime</span><span class="p">,</span> <span class="n">data</span><span class="p">)</span>
<span class="k">return</span> <span class="n">data</span><span class="p">,</span> <span class="n">mime</span></div>
<div class="viewcode-block" id="favicon_url">
<a class="viewcode-back" href="../../../src/searx.favicons.html#searx.favicons.favicon_url">[docs]</a>
<span class="k">def</span> <span class="nf">favicon_url</span><span class="p">(</span><span class="n">authority</span><span class="p">:</span> <span class="nb">str</span><span class="p">)</span> <span class="o">-></span> <span class="nb">str</span><span class="p">:</span>
<span class="w"> </span><span class="sd">"""Function to generate the image URL used for favicons in SearXNG's result</span>
<span class="sd"> lists. The ``authority`` argument (aka netloc / :rfc:`3986`) is usually a</span>
<span class="sd"> (sub-) domain name. This function is used in the HTML (jinja) templates.</span>
<span class="sd"> .. code:: html</span>
<span class="sd"> <div class="favicon"></span>
<span class="sd"> <img src="{{ favicon_url(result.parsed_url.netloc) }}"></span>
<span class="sd"> </div></span>
<span class="sd"> The returned URL is a route to :py:obj:`favicon_proxy` REST API.</span>
<span class="sd"> If the favicon is already in the cache, the returned URL is a `data URL`_</span>
<span class="sd"> (something like ``data:image/png;base64,...``). By generating a data url from</span>
<span class="sd"> the :py:obj:`.cache.FaviconCache`, additional HTTP roundtripps via the</span>
<span class="sd"> :py:obj:`favicon_proxy` are saved. However, it must also be borne in mind</span>
<span class="sd"> that data urls are not cached in the client (web browser).</span>
<span class="sd"> .. _data URL: https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URLs</span>
<span class="sd"> """</span>
<span class="n">resolver</span> <span class="o">=</span> <span class="n">flask</span><span class="o">.</span><span class="n">request</span><span class="o">.</span><span class="n">preferences</span><span class="o">.</span><span class="n">get_value</span><span class="p">(</span><span class="s1">'favicon_resolver'</span><span class="p">)</span> <span class="c1"># type: ignore</span>
<span class="c1"># if resolver is empty or not valid, just return nothing.</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">resolver</span> <span class="ow">or</span> <span class="n">resolver</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">CFG</span><span class="o">.</span><span class="n">resolver_map</span><span class="o">.</span><span class="n">keys</span><span class="p">():</span>
<span class="k">return</span> <span class="s2">""</span>
<span class="n">data_mime</span> <span class="o">=</span> <span class="n">cache</span><span class="o">.</span><span class="n">CACHE</span><span class="p">(</span><span class="n">resolver</span><span class="p">,</span> <span class="n">authority</span><span class="p">)</span>
<span class="k">if</span> <span class="n">data_mime</span> <span class="o">==</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="c1"># we have already checked, the resolver does not have a favicon</span>
<span class="n">theme</span> <span class="o">=</span> <span class="n">flask</span><span class="o">.</span><span class="n">request</span><span class="o">.</span><span class="n">preferences</span><span class="o">.</span><span class="n">get_value</span><span class="p">(</span><span class="s2">"theme"</span><span class="p">)</span> <span class="c1"># type: ignore</span>
<span class="k">return</span> <span class="n">CFG</span><span class="o">.</span><span class="n">favicon_data_url</span><span class="p">(</span><span class="n">theme</span><span class="o">=</span><span class="n">theme</span><span class="p">)</span>
<span class="k">if</span> <span class="n">data_mime</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">data</span><span class="p">,</span> <span class="n">mime</span> <span class="o">=</span> <span class="n">data_mime</span>
<span class="k">return</span> <span class="sa">f</span><span class="s2">"data:</span><span class="si">{</span><span class="n">mime</span><span class="si">}</span><span class="s2">;base64,</span><span class="si">{</span><span class="nb">str</span><span class="p">(</span><span class="n">base64</span><span class="o">.</span><span class="n">b64encode</span><span class="p">(</span><span class="n">data</span><span class="p">),</span><span class="w"> </span><span class="s1">'utf-8'</span><span class="p">)</span><span class="si">}</span><span class="s2">"</span> <span class="c1"># type: ignore</span>
<span class="n">h</span> <span class="o">=</span> <span class="n">new_hmac</span><span class="p">(</span><span class="n">CFG</span><span class="o">.</span><span class="n">secret_key</span><span class="p">,</span> <span class="n">authority</span><span class="o">.</span><span class="n">encode</span><span class="p">())</span>
<span class="n">proxy_url</span> <span class="o">=</span> <span class="n">flask</span><span class="o">.</span><span class="n">url_for</span><span class="p">(</span><span class="s1">'favicon_proxy'</span><span class="p">)</span>
<span class="n">query</span> <span class="o">=</span> <span class="n">urllib</span><span class="o">.</span><span class="n">parse</span><span class="o">.</span><span class="n">urlencode</span><span class="p">({</span><span class="s2">"authority"</span><span class="p">:</span> <span class="n">authority</span><span class="p">,</span> <span class="s2">"h"</span><span class="p">:</span> <span class="n">h</span><span class="p">})</span>
<span class="k">return</span> <span class="sa">f</span><span class="s2">"</span><span class="si">{</span><span class="n">proxy_url</span><span class="si">}</span><span class="s2">?</span><span class="si">{</span><span class="n">query</span><span class="si">}</span><span class="s2">"</span></div>
</pre></div>
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