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<h1>Source code for django.views.decorators.http</h1><div class="highlight"><pre>
<span></span><span class="sd">"""</span>
<span class="sd">Decorators for views based on HTTP headers.</span>
<span class="sd">"""</span>
<span class="kn">import</span> <span class="nn">logging</span>
<span class="kn">from</span> <span class="nn">calendar</span> <span class="k">import</span> <span class="n">timegm</span>
<span class="kn">from</span> <span class="nn">functools</span> <span class="k">import</span> <span class="n">wraps</span>
<span class="kn">from</span> <span class="nn">django.http</span> <span class="k">import</span> <span class="p">(</span>
<span class="n">HttpResponse</span><span class="p">,</span> <span class="n">HttpResponseNotAllowed</span><span class="p">,</span> <span class="n">HttpResponseNotModified</span><span class="p">,</span>
<span class="p">)</span>
<span class="kn">from</span> <span class="nn">django.middleware.http</span> <span class="k">import</span> <span class="n">ConditionalGetMiddleware</span>
<span class="kn">from</span> <span class="nn">django.utils.decorators</span> <span class="k">import</span> <span class="n">available_attrs</span><span class="p">,</span> <span class="n">decorator_from_middleware</span>
<span class="kn">from</span> <span class="nn">django.utils.http</span> <span class="k">import</span> <span class="p">(</span>
<span class="n">http_date</span><span class="p">,</span> <span class="n">parse_etags</span><span class="p">,</span> <span class="n">parse_http_date_safe</span><span class="p">,</span> <span class="n">quote_etag</span><span class="p">,</span>
<span class="p">)</span>
<span class="n">conditional_page</span> <span class="o">=</span> <span class="n">decorator_from_middleware</span><span class="p">(</span><span class="n">ConditionalGetMiddleware</span><span class="p">)</span>
<span class="n">logger</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="s1">'django.request'</span><span class="p">)</span>
<div class="viewcode-block" id="require_http_methods"><a class="viewcode-back" href="../../../../topics/http/decorators.html#django.views.decorators.http.require_http_methods">[docs]</a><span class="k">def</span> <span class="nf">require_http_methods</span><span class="p">(</span><span class="n">request_method_list</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Decorator to make a view only accept particular request methods. Usage::</span>
<span class="sd"> @require_http_methods(["GET", "POST"])</span>
<span class="sd"> def my_view(request):</span>
<span class="sd"> # I can assume now that only GET or POST requests make it this far</span>
<span class="sd"> # ...</span>
<span class="sd"> Note that request methods should be in uppercase.</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="nf">decorator</span><span class="p">(</span><span class="n">func</span><span class="p">):</span>
<span class="nd">@wraps</span><span class="p">(</span><span class="n">func</span><span class="p">,</span> <span class="n">assigned</span><span class="o">=</span><span class="n">available_attrs</span><span class="p">(</span><span class="n">func</span><span class="p">))</span>
<span class="k">def</span> <span class="nf">inner</span><span class="p">(</span><span class="n">request</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="k">if</span> <span class="n">request</span><span class="o">.</span><span class="n">method</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">request_method_list</span><span class="p">:</span>
<span class="n">logger</span><span class="o">.</span><span class="n">warning</span><span class="p">(</span><span class="s1">'Method Not Allowed (</span><span class="si">%s</span><span class="s1">): </span><span class="si">%s</span><span class="s1">'</span><span class="p">,</span> <span class="n">request</span><span class="o">.</span><span class="n">method</span><span class="p">,</span> <span class="n">request</span><span class="o">.</span><span class="n">path</span><span class="p">,</span>
<span class="n">extra</span><span class="o">=</span><span class="p">{</span>
<span class="s1">'status_code'</span><span class="p">:</span> <span class="mi">405</span><span class="p">,</span>
<span class="s1">'request'</span><span class="p">:</span> <span class="n">request</span>
<span class="p">}</span>
<span class="p">)</span>
<span class="k">return</span> <span class="n">HttpResponseNotAllowed</span><span class="p">(</span><span class="n">request_method_list</span><span class="p">)</span>
<span class="k">return</span> <span class="n">func</span><span class="p">(</span><span class="n">request</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
<span class="k">return</span> <span class="n">inner</span>
<span class="k">return</span> <span class="n">decorator</span></div>
<span class="n">require_GET</span> <span class="o">=</span> <span class="n">require_http_methods</span><span class="p">([</span><span class="s2">"GET"</span><span class="p">])</span>
<span class="n">require_GET</span><span class="o">.</span><span class="n">__doc__</span> <span class="o">=</span> <span class="s2">"Decorator to require that a view only accepts the GET method."</span>
<span class="n">require_POST</span> <span class="o">=</span> <span class="n">require_http_methods</span><span class="p">([</span><span class="s2">"POST"</span><span class="p">])</span>
<span class="n">require_POST</span><span class="o">.</span><span class="n">__doc__</span> <span class="o">=</span> <span class="s2">"Decorator to require that a view only accepts the POST method."</span>
<span class="n">require_safe</span> <span class="o">=</span> <span class="n">require_http_methods</span><span class="p">([</span><span class="s2">"GET"</span><span class="p">,</span> <span class="s2">"HEAD"</span><span class="p">])</span>
<span class="n">require_safe</span><span class="o">.</span><span class="n">__doc__</span> <span class="o">=</span> <span class="s2">"Decorator to require that a view only accepts safe methods: GET and HEAD."</span>
<span class="k">def</span> <span class="nf">_precondition_failed</span><span class="p">(</span><span class="n">request</span><span class="p">):</span>
<span class="n">logger</span><span class="o">.</span><span class="n">warning</span><span class="p">(</span><span class="s1">'Precondition Failed: </span><span class="si">%s</span><span class="s1">'</span><span class="p">,</span> <span class="n">request</span><span class="o">.</span><span class="n">path</span><span class="p">,</span>
<span class="n">extra</span><span class="o">=</span><span class="p">{</span>
<span class="s1">'status_code'</span><span class="p">:</span> <span class="mi">412</span><span class="p">,</span>
<span class="s1">'request'</span><span class="p">:</span> <span class="n">request</span>
<span class="p">},</span>
<span class="p">)</span>
<span class="k">return</span> <span class="n">HttpResponse</span><span class="p">(</span><span class="n">status</span><span class="o">=</span><span class="mi">412</span><span class="p">)</span>
<div class="viewcode-block" id="condition"><a class="viewcode-back" href="../../../../topics/http/decorators.html#django.views.decorators.http.condition">[docs]</a><span class="k">def</span> <span class="nf">condition</span><span class="p">(</span><span class="n">etag_func</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">last_modified_func</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Decorator to support conditional retrieval (or change) for a view</span>
<span class="sd"> function.</span>
<span class="sd"> The parameters are callables to compute the ETag and last modified time for</span>
<span class="sd"> the requested resource, respectively. The callables are passed the same</span>
<span class="sd"> parameters as the view itself. The Etag function should return a string (or</span>
<span class="sd"> None if the resource doesn't exist), whilst the last_modified function</span>
<span class="sd"> should return a datetime object (or None if the resource doesn't exist).</span>
<span class="sd"> If both parameters are provided, all the preconditions must be met before</span>
<span class="sd"> the view is processed.</span>
<span class="sd"> This decorator will either pass control to the wrapped view function or</span>
<span class="sd"> return an HTTP 304 response (unmodified) or 412 response (preconditions</span>
<span class="sd"> failed), depending upon the request method.</span>
<span class="sd"> Any behavior marked as "undefined" in the HTTP spec (e.g. If-none-match</span>
<span class="sd"> plus If-modified-since headers) will result in the view function being</span>
<span class="sd"> called.</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="nf">decorator</span><span class="p">(</span><span class="n">func</span><span class="p">):</span>
<span class="nd">@wraps</span><span class="p">(</span><span class="n">func</span><span class="p">,</span> <span class="n">assigned</span><span class="o">=</span><span class="n">available_attrs</span><span class="p">(</span><span class="n">func</span><span class="p">))</span>
<span class="k">def</span> <span class="nf">inner</span><span class="p">(</span><span class="n">request</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="c1"># Get HTTP request headers</span>
<span class="n">if_modified_since</span> <span class="o">=</span> <span class="n">request</span><span class="o">.</span><span class="n">META</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"HTTP_IF_MODIFIED_SINCE"</span><span class="p">)</span>
<span class="k">if</span> <span class="n">if_modified_since</span><span class="p">:</span>
<span class="n">if_modified_since</span> <span class="o">=</span> <span class="n">parse_http_date_safe</span><span class="p">(</span><span class="n">if_modified_since</span><span class="p">)</span>
<span class="n">if_unmodified_since</span> <span class="o">=</span> <span class="n">request</span><span class="o">.</span><span class="n">META</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"HTTP_IF_UNMODIFIED_SINCE"</span><span class="p">)</span>
<span class="k">if</span> <span class="n">if_unmodified_since</span><span class="p">:</span>
<span class="n">if_unmodified_since</span> <span class="o">=</span> <span class="n">parse_http_date_safe</span><span class="p">(</span><span class="n">if_unmodified_since</span><span class="p">)</span>
<span class="n">if_none_match</span> <span class="o">=</span> <span class="n">request</span><span class="o">.</span><span class="n">META</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"HTTP_IF_NONE_MATCH"</span><span class="p">)</span>
<span class="n">if_match</span> <span class="o">=</span> <span class="n">request</span><span class="o">.</span><span class="n">META</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"HTTP_IF_MATCH"</span><span class="p">)</span>
<span class="n">etags</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">if</span> <span class="n">if_none_match</span> <span class="ow">or</span> <span class="n">if_match</span><span class="p">:</span>
<span class="c1"># There can be more than one ETag in the request, so we</span>
<span class="c1"># consider the list of values.</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">etags</span> <span class="o">=</span> <span class="n">parse_etags</span><span class="p">(</span><span class="n">if_none_match</span> <span class="ow">or</span> <span class="n">if_match</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">ValueError</span><span class="p">:</span>
<span class="c1"># In case of invalid etag ignore all ETag headers.</span>
<span class="c1"># Apparently Opera sends invalidly quoted headers at times</span>
<span class="c1"># (we should be returning a 400 response, but that's a</span>
<span class="c1"># little extreme) -- this is Django bug #10681.</span>
<span class="n">if_none_match</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">if_match</span> <span class="o">=</span> <span class="kc">None</span>
<span class="c1"># Compute values (if any) for the requested resource.</span>
<span class="k">def</span> <span class="nf">get_last_modified</span><span class="p">():</span>
<span class="k">if</span> <span class="n">last_modified_func</span><span class="p">:</span>
<span class="n">dt</span> <span class="o">=</span> <span class="n">last_modified_func</span><span class="p">(</span><span class="n">request</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
<span class="k">if</span> <span class="n">dt</span><span class="p">:</span>
<span class="k">return</span> <span class="n">timegm</span><span class="p">(</span><span class="n">dt</span><span class="o">.</span><span class="n">utctimetuple</span><span class="p">())</span>
<span class="n">res_etag</span> <span class="o">=</span> <span class="n">etag_func</span><span class="p">(</span><span class="n">request</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span> <span class="k">if</span> <span class="n">etag_func</span> <span class="k">else</span> <span class="kc">None</span>
<span class="n">res_last_modified</span> <span class="o">=</span> <span class="n">get_last_modified</span><span class="p">()</span>
<span class="n">response</span> <span class="o">=</span> <span class="kc">None</span>
<span class="k">if</span> <span class="ow">not</span> <span class="p">((</span><span class="n">if_match</span> <span class="ow">and</span> <span class="n">if_modified_since</span><span class="p">)</span> <span class="ow">or</span>
<span class="p">(</span><span class="n">if_none_match</span> <span class="ow">and</span> <span class="n">if_unmodified_since</span><span class="p">)</span> <span class="ow">or</span>
<span class="p">(</span><span class="n">if_modified_since</span> <span class="ow">and</span> <span class="n">if_unmodified_since</span><span class="p">)</span> <span class="ow">or</span>
<span class="p">(</span><span class="n">if_match</span> <span class="ow">and</span> <span class="n">if_none_match</span><span class="p">)):</span>
<span class="c1"># We only get here if no undefined combinations of headers are</span>
<span class="c1"># specified.</span>
<span class="k">if</span> <span class="p">((</span><span class="n">if_none_match</span> <span class="ow">and</span> <span class="p">(</span><span class="n">res_etag</span> <span class="ow">in</span> <span class="n">etags</span> <span class="ow">or</span>
<span class="s2">"*"</span> <span class="ow">in</span> <span class="n">etags</span> <span class="ow">and</span> <span class="n">res_etag</span><span class="p">))</span> <span class="ow">and</span>
<span class="p">(</span><span class="ow">not</span> <span class="n">if_modified_since</span> <span class="ow">or</span>
<span class="p">(</span><span class="n">res_last_modified</span> <span class="ow">and</span> <span class="n">if_modified_since</span> <span class="ow">and</span>
<span class="n">res_last_modified</span> <span class="o"><=</span> <span class="n">if_modified_since</span><span class="p">))):</span>
<span class="k">if</span> <span class="n">request</span><span class="o">.</span><span class="n">method</span> <span class="ow">in</span> <span class="p">(</span><span class="s2">"GET"</span><span class="p">,</span> <span class="s2">"HEAD"</span><span class="p">):</span>
<span class="n">response</span> <span class="o">=</span> <span class="n">HttpResponseNotModified</span><span class="p">()</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">response</span> <span class="o">=</span> <span class="n">_precondition_failed</span><span class="p">(</span><span class="n">request</span><span class="p">)</span>
<span class="k">elif</span> <span class="p">(</span><span class="n">if_match</span> <span class="ow">and</span> <span class="p">((</span><span class="ow">not</span> <span class="n">res_etag</span> <span class="ow">and</span> <span class="s2">"*"</span> <span class="ow">in</span> <span class="n">etags</span><span class="p">)</span> <span class="ow">or</span>
<span class="p">(</span><span class="n">res_etag</span> <span class="ow">and</span> <span class="n">res_etag</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">etags</span><span class="p">)</span> <span class="ow">or</span>
<span class="p">(</span><span class="n">res_last_modified</span> <span class="ow">and</span> <span class="n">if_unmodified_since</span> <span class="ow">and</span>
<span class="n">res_last_modified</span> <span class="o">></span> <span class="n">if_unmodified_since</span><span class="p">))):</span>
<span class="n">response</span> <span class="o">=</span> <span class="n">_precondition_failed</span><span class="p">(</span><span class="n">request</span><span class="p">)</span>
<span class="k">elif</span> <span class="p">(</span><span class="ow">not</span> <span class="n">if_none_match</span> <span class="ow">and</span> <span class="n">request</span><span class="o">.</span><span class="n">method</span> <span class="ow">in</span> <span class="p">(</span><span class="s2">"GET"</span><span class="p">,</span> <span class="s2">"HEAD"</span><span class="p">)</span> <span class="ow">and</span>
<span class="n">res_last_modified</span> <span class="ow">and</span> <span class="n">if_modified_since</span> <span class="ow">and</span>
<span class="n">res_last_modified</span> <span class="o"><=</span> <span class="n">if_modified_since</span><span class="p">):</span>
<span class="n">response</span> <span class="o">=</span> <span class="n">HttpResponseNotModified</span><span class="p">()</span>
<span class="k">elif</span> <span class="p">(</span><span class="ow">not</span> <span class="n">if_match</span> <span class="ow">and</span>
<span class="n">res_last_modified</span> <span class="ow">and</span> <span class="n">if_unmodified_since</span> <span class="ow">and</span>
<span class="n">res_last_modified</span> <span class="o">></span> <span class="n">if_unmodified_since</span><span class="p">):</span>
<span class="n">response</span> <span class="o">=</span> <span class="n">_precondition_failed</span><span class="p">(</span><span class="n">request</span><span class="p">)</span>
<span class="k">if</span> <span class="n">response</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">response</span> <span class="o">=</span> <span class="n">func</span><span class="p">(</span><span class="n">request</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
<span class="c1"># Set relevant headers on the response if they don't already exist.</span>
<span class="k">if</span> <span class="n">res_last_modified</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">response</span><span class="o">.</span><span class="n">has_header</span><span class="p">(</span><span class="s1">'Last-Modified'</span><span class="p">):</span>
<span class="n">response</span><span class="p">[</span><span class="s1">'Last-Modified'</span><span class="p">]</span> <span class="o">=</span> <span class="n">http_date</span><span class="p">(</span><span class="n">res_last_modified</span><span class="p">)</span>
<span class="k">if</span> <span class="n">res_etag</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">response</span><span class="o">.</span><span class="n">has_header</span><span class="p">(</span><span class="s1">'ETag'</span><span class="p">):</span>
<span class="n">response</span><span class="p">[</span><span class="s1">'ETag'</span><span class="p">]</span> <span class="o">=</span> <span class="n">quote_etag</span><span class="p">(</span><span class="n">res_etag</span><span class="p">)</span>
<span class="k">return</span> <span class="n">response</span>
<span class="k">return</span> <span class="n">inner</span>
<span class="k">return</span> <span class="n">decorator</span></div>
<span class="c1"># Shortcut decorators for common cases based on ETag or Last-Modified only</span>
<div class="viewcode-block" id="etag"><a class="viewcode-back" href="../../../../topics/http/decorators.html#django.views.decorators.http.etag">[docs]</a><span class="k">def</span> <span class="nf">etag</span><span class="p">(</span><span class="n">etag_func</span><span class="p">):</span>
<span class="k">return</span> <span class="n">condition</span><span class="p">(</span><span class="n">etag_func</span><span class="o">=</span><span class="n">etag_func</span><span class="p">)</span></div>
<div class="viewcode-block" id="last_modified"><a class="viewcode-back" href="../../../../topics/http/decorators.html#django.views.decorators.http.last_modified">[docs]</a><span class="k">def</span> <span class="nf">last_modified</span><span class="p">(</span><span class="n">last_modified_func</span><span class="p">):</span>
<span class="k">return</span> <span class="n">condition</span><span class="p">(</span><span class="n">last_modified_func</span><span class="o">=</span><span class="n">last_modified_func</span><span class="p">)</span></div>
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