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<h1>Source code for django.middleware.clickjacking</h1><div class="highlight"><pre>
<span class="sd">"""</span>
<span class="sd">Clickjacking Protection Middleware.</span>
<span class="sd">This module provides a middleware that implements protection against a</span>
<span class="sd">malicious site loading resources from your site in a hidden frame.</span>
<span class="sd">"""</span>
<span class="kn">from</span> <span class="nn">django.conf</span> <span class="kn">import</span> <span class="n">settings</span>
<div class="viewcode-block" id="XFrameOptionsMiddleware"><a class="viewcode-back" href="../../../ref/middleware.html#django.middleware.clickjacking.XFrameOptionsMiddleware">[docs]</a><span class="k">class</span> <span class="nc">XFrameOptionsMiddleware</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Middleware that sets the X-Frame-Options HTTP header in HTTP responses.</span>
<span class="sd"> Does not set the header if it's already set or if the response contains</span>
<span class="sd"> a xframe_options_exempt value set to True.</span>
<span class="sd"> By default, sets the X-Frame-Options header to 'SAMEORIGIN', meaning the</span>
<span class="sd"> response can only be loaded on a frame within the same site. To prevent the</span>
<span class="sd"> response from being loaded in a frame in any site, set X_FRAME_OPTIONS in</span>
<span class="sd"> your project's Django settings to 'DENY'.</span>
<span class="sd"> Note: older browsers will quietly ignore this header, thus other</span>
<span class="sd"> clickjacking protection techniques should be used if protection in those</span>
<span class="sd"> browsers is required.</span>
<span class="sd"> http://en.wikipedia.org/wiki/Clickjacking#Server_and_client</span>
<span class="sd"> """</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="c"># Don't set it if it's already in the response</span>
<span class="k">if</span> <span class="n">response</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s">'X-Frame-Options'</span><span class="p">,</span> <span class="bp">None</span><span class="p">)</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span><span class="p">:</span>
<span class="k">return</span> <span class="n">response</span>
<span class="c"># Don't set it if they used @xframe_options_exempt</span>
<span class="k">if</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">response</span><span class="p">,</span> <span class="s">'xframe_options_exempt'</span><span class="p">,</span> <span class="bp">False</span><span class="p">):</span>
<span class="k">return</span> <span class="n">response</span>
<span class="n">response</span><span class="p">[</span><span class="s">'X-Frame-Options'</span><span class="p">]</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_xframe_options_value</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">return</span> <span class="n">response</span>
<span class="k">def</span> <span class="nf">get_xframe_options_value</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="sd">"""</span>
<span class="sd"> Gets the value to set for the X_FRAME_OPTIONS header.</span>
<span class="sd"> By default this uses the value from the X_FRAME_OPTIONS Django</span>
<span class="sd"> settings. If not found in settings, defaults to 'SAMEORIGIN'.</span>
<span class="sd"> This method can be overridden if needed, allowing it to vary based on</span>
<span class="sd"> the request or response.</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">settings</span><span class="p">,</span> <span class="s">'X_FRAME_OPTIONS'</span><span class="p">,</span> <span class="s">'SAMEORIGIN'</span><span class="p">)</span><span class="o">.</span><span class="n">upper</span><span class="p">()</span></div>
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