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id="_modules-django-contrib-messages-middleware"> <h1>Source code for django.contrib.messages.middleware</h1><div class="highlight"><pre> <span></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.contrib.messages.storage</span> <span class="k">import</span> <span class="n">default_storage</span> <div class="viewcode-block" id="MessageMiddleware"><a class="viewcode-back" href="../../../../ref/middleware.html#django.contrib.messages.middleware.MessageMiddleware">[docs]</a><span class="k">class</span> <span class="nc">MessageMiddleware</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span> <span class="sd">"""</span> <span class="sd"> Middleware that handles temporary messages.</span> <span class="sd"> """</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">request</span><span class="o">.</span><span class="n">_messages</span> <span class="o">=</span> <span class="n">default_storage</span><span class="p">(</span><span class="n">request</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="sd">"""</span> <span class="sd"> Updates the storage backend (i.e., saves the messages).</span> <span class="sd"> If not all messages could not be stored and ``DEBUG`` is ``True``, a</span> <span class="sd"> ``ValueError`` is raised.</span> <span class="sd"> """</span> <span class="c1"># A higher middleware layer may return a request which does not contain</span> <span class="c1"># messages storage, so make no assumption that it will be there.</span> <span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">request</span><span class="p">,</span> <span class="s1">'_messages'</span><span class="p">):</span> <span class="n">unstored_messages</span> <span class="o">=</span> <span class="n">request</span><span class="o">.</span><span class="n">_messages</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">response</span><span class="p">)</span> <span class="k">if</span> <span class="n">unstored_messages</span> <span class="ow">and</span> <span class="n">settings</span><span class="o">.</span><span class="n">DEBUG</span><span class="p">:</span> <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s1">'Not all temporary messages could be stored.'</span><span class="p">)</span> <span class="k">return</span> <span class="n">response</span></div> 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