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  <h1>Source code for django.middleware.security</h1><div class="highlight"><pre>
<span></span><span class="kn">import</span> <span class="nn">re</span>

<span class="kn">from</span> <span class="nn">django.conf</span> <span class="k">import</span> <span class="n">settings</span>
<span class="kn">from</span> <span class="nn">django.http</span> <span class="k">import</span> <span class="n">HttpResponsePermanentRedirect</span>


<div class="viewcode-block" id="SecurityMiddleware"><a class="viewcode-back" href="../../../ref/middleware.html#django.middleware.security.SecurityMiddleware">[docs]</a><span class="k">class</span> <span class="nc">SecurityMiddleware</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
    <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">sts_seconds</span> <span class="o">=</span> <span class="n">settings</span><span class="o">.</span><span class="n">SECURE_HSTS_SECONDS</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">sts_include_subdomains</span> <span class="o">=</span> <span class="n">settings</span><span class="o">.</span><span class="n">SECURE_HSTS_INCLUDE_SUBDOMAINS</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">content_type_nosniff</span> <span class="o">=</span> <span class="n">settings</span><span class="o">.</span><span class="n">SECURE_CONTENT_TYPE_NOSNIFF</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">xss_filter</span> <span class="o">=</span> <span class="n">settings</span><span class="o">.</span><span class="n">SECURE_BROWSER_XSS_FILTER</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">redirect</span> <span class="o">=</span> <span class="n">settings</span><span class="o">.</span><span class="n">SECURE_SSL_REDIRECT</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">redirect_host</span> <span class="o">=</span> <span class="n">settings</span><span class="o">.</span><span class="n">SECURE_SSL_HOST</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">redirect_exempt</span> <span class="o">=</span> <span class="p">[</span><span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span><span class="n">r</span><span class="p">)</span> <span class="k">for</span> <span class="n">r</span> <span class="ow">in</span> <span class="n">settings</span><span class="o">.</span><span class="n">SECURE_REDIRECT_EXEMPT</span><span class="p">]</span>

    <span class="k">def</span> <span class="nf">process_request</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">request</span><span class="p">):</span>
        <span class="n">path</span> <span class="o">=</span> <span class="n">request</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">lstrip</span><span class="p">(</span><span class="s2">&quot;/&quot;</span><span class="p">)</span>
        <span class="k">if</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">redirect</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">request</span><span class="o">.</span><span class="n">is_secure</span><span class="p">()</span> <span class="ow">and</span>
                <span class="ow">not</span> <span class="nb">any</span><span class="p">(</span><span class="n">pattern</span><span class="o">.</span><span class="n">search</span><span class="p">(</span><span class="n">path</span><span class="p">)</span>
                        <span class="k">for</span> <span class="n">pattern</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">redirect_exempt</span><span class="p">)):</span>
            <span class="n">host</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">redirect_host</span> <span class="ow">or</span> <span class="n">request</span><span class="o">.</span><span class="n">get_host</span><span class="p">()</span>
            <span class="k">return</span> <span class="n">HttpResponsePermanentRedirect</span><span class="p">(</span>
                <span class="s2">&quot;https://</span><span class="si">%s%s</span><span class="s2">&quot;</span> <span class="o">%</span> <span class="p">(</span><span class="n">host</span><span class="p">,</span> <span class="n">request</span><span class="o">.</span><span class="n">get_full_path</span><span class="p">())</span>
            <span class="p">)</span>

    <span class="k">def</span> <span class="nf">process_response</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">request</span><span class="p">,</span> <span class="n">response</span><span class="p">):</span>
        <span class="k">if</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">sts_seconds</span> <span class="ow">and</span> <span class="n">request</span><span class="o">.</span><span class="n">is_secure</span><span class="p">()</span> <span class="ow">and</span>
                <span class="s1">&#39;strict-transport-security&#39;</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">response</span><span class="p">):</span>
            <span class="n">sts_header</span> <span class="o">=</span> <span class="s2">&quot;max-age=</span><span class="si">%s</span><span class="s2">&quot;</span> <span class="o">%</span> <span class="bp">self</span><span class="o">.</span><span class="n">sts_seconds</span>

            <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">sts_include_subdomains</span><span class="p">:</span>
                <span class="n">sts_header</span> <span class="o">=</span> <span class="n">sts_header</span> <span class="o">+</span> <span class="s2">&quot;; includeSubDomains&quot;</span>

            <span class="n">response</span><span class="p">[</span><span class="s2">&quot;strict-transport-security&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="n">sts_header</span>

        <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">content_type_nosniff</span> <span class="ow">and</span> <span class="s1">&#39;x-content-type-options&#39;</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">response</span><span class="p">:</span>
            <span class="n">response</span><span class="p">[</span><span class="s2">&quot;x-content-type-options&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="s2">&quot;nosniff&quot;</span>

        <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">xss_filter</span> <span class="ow">and</span> <span class="s1">&#39;x-xss-protection&#39;</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">response</span><span class="p">:</span>
            <span class="n">response</span><span class="p">[</span><span class="s2">&quot;x-xss-protection&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="s2">&quot;1; mode=block&quot;</span>

        <span class="k">return</span> <span class="n">response</span></div>
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