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<h1>Source code for django.utils.http</h1><div class="highlight"><pre>
<span class="kn">from</span> <span class="nn">__future__</span> <span class="kn">import</span> <span class="n">unicode_literals</span>
<span class="kn">import</span> <span class="nn">base64</span>
<span class="kn">import</span> <span class="nn">calendar</span>
<span class="kn">import</span> <span class="nn">datetime</span>
<span class="kn">import</span> <span class="nn">re</span>
<span class="kn">import</span> <span class="nn">sys</span>
<span class="kn">from</span> <span class="nn">binascii</span> <span class="kn">import</span> <span class="n">Error</span> <span class="k">as</span> <span class="n">BinasciiError</span>
<span class="kn">from</span> <span class="nn">email.utils</span> <span class="kn">import</span> <span class="n">formatdate</span>
<span class="kn">from</span> <span class="nn">django.utils.datastructures</span> <span class="kn">import</span> <span class="n">MultiValueDict</span>
<span class="kn">from</span> <span class="nn">django.utils.encoding</span> <span class="kn">import</span> <span class="n">force_str</span><span class="p">,</span> <span class="n">force_text</span>
<span class="kn">from</span> <span class="nn">django.utils.functional</span> <span class="kn">import</span> <span class="n">allow_lazy</span>
<span class="kn">from</span> <span class="nn">django.utils</span> <span class="kn">import</span> <span class="n">six</span>
<span class="kn">from</span> <span class="nn">django.utils.six.moves.urllib.parse</span> <span class="kn">import</span> <span class="p">(</span>
<span class="n">quote</span><span class="p">,</span> <span class="n">quote_plus</span><span class="p">,</span> <span class="n">unquote</span><span class="p">,</span> <span class="n">unquote_plus</span><span class="p">,</span> <span class="n">urlparse</span><span class="p">,</span>
<span class="n">urlencode</span> <span class="k">as</span> <span class="n">original_urlencode</span><span class="p">)</span>
<span class="n">ETAG_MATCH</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span><span class="s">r'(?:W/)?"((?:</span><span class="se">\\</span><span class="s">.|[^"])*)"'</span><span class="p">)</span>
<span class="n">MONTHS</span> <span class="o">=</span> <span class="s">'jan feb mar apr may jun jul aug sep oct nov dec'</span><span class="o">.</span><span class="n">split</span><span class="p">()</span>
<span class="n">__D</span> <span class="o">=</span> <span class="s">r'(?P<day>\d{2})'</span>
<span class="n">__D2</span> <span class="o">=</span> <span class="s">r'(?P<day>[ \d]\d)'</span>
<span class="n">__M</span> <span class="o">=</span> <span class="s">r'(?P<mon>\w{3})'</span>
<span class="n">__Y</span> <span class="o">=</span> <span class="s">r'(?P<year>\d{4})'</span>
<span class="n">__Y2</span> <span class="o">=</span> <span class="s">r'(?P<year>\d{2})'</span>
<span class="n">__T</span> <span class="o">=</span> <span class="s">r'(?P<hour>\d{2}):(?P<min>\d{2}):(?P<sec>\d{2})'</span>
<span class="n">RFC1123_DATE</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span><span class="s">r'^\w{3}, </span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s"> GMT$'</span> <span class="o">%</span> <span class="p">(</span><span class="n">__D</span><span class="p">,</span> <span class="n">__M</span><span class="p">,</span> <span class="n">__Y</span><span class="p">,</span> <span class="n">__T</span><span class="p">))</span>
<span class="n">RFC850_DATE</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span><span class="s">r'^\w{6,9}, </span><span class="si">%s</span><span class="s">-</span><span class="si">%s</span><span class="s">-</span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s"> GMT$'</span> <span class="o">%</span> <span class="p">(</span><span class="n">__D</span><span class="p">,</span> <span class="n">__M</span><span class="p">,</span> <span class="n">__Y2</span><span class="p">,</span> <span class="n">__T</span><span class="p">))</span>
<span class="n">ASCTIME_DATE</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span><span class="s">r'^\w{3} </span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s"> </span><span class="si">%s</span><span class="s">$'</span> <span class="o">%</span> <span class="p">(</span><span class="n">__M</span><span class="p">,</span> <span class="n">__D2</span><span class="p">,</span> <span class="n">__T</span><span class="p">,</span> <span class="n">__Y</span><span class="p">))</span>
<div class="viewcode-block" id="urlquote"><a class="viewcode-back" href="../../../ref/utils.html#django.utils.http.urlquote">[docs]</a><span class="k">def</span> <span class="nf">urlquote</span><span class="p">(</span><span class="n">url</span><span class="p">,</span> <span class="n">safe</span><span class="o">=</span><span class="s">'/'</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> A version of Python's urllib.quote() function that can operate on unicode</span>
<span class="sd"> strings. The url is first UTF-8 encoded before quoting. The returned string</span>
<span class="sd"> can safely be used as part of an argument to a subsequent iri_to_uri() call</span>
<span class="sd"> without double-quoting occurring.</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">force_text</span><span class="p">(</span><span class="n">quote</span><span class="p">(</span><span class="n">force_str</span><span class="p">(</span><span class="n">url</span><span class="p">),</span> <span class="n">force_str</span><span class="p">(</span><span class="n">safe</span><span class="p">)))</span></div>
<span class="n">urlquote</span> <span class="o">=</span> <span class="n">allow_lazy</span><span class="p">(</span><span class="n">urlquote</span><span class="p">,</span> <span class="n">six</span><span class="o">.</span><span class="n">text_type</span><span class="p">)</span>
<div class="viewcode-block" id="urlquote_plus"><a class="viewcode-back" href="../../../ref/utils.html#django.utils.http.urlquote_plus">[docs]</a><span class="k">def</span> <span class="nf">urlquote_plus</span><span class="p">(</span><span class="n">url</span><span class="p">,</span> <span class="n">safe</span><span class="o">=</span><span class="s">''</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> A version of Python's urllib.quote_plus() function that can operate on</span>
<span class="sd"> unicode strings. The url is first UTF-8 encoded before quoting. The</span>
<span class="sd"> returned string can safely be used as part of an argument to a subsequent</span>
<span class="sd"> iri_to_uri() call without double-quoting occurring.</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">force_text</span><span class="p">(</span><span class="n">quote_plus</span><span class="p">(</span><span class="n">force_str</span><span class="p">(</span><span class="n">url</span><span class="p">),</span> <span class="n">force_str</span><span class="p">(</span><span class="n">safe</span><span class="p">)))</span></div>
<span class="n">urlquote_plus</span> <span class="o">=</span> <span class="n">allow_lazy</span><span class="p">(</span><span class="n">urlquote_plus</span><span class="p">,</span> <span class="n">six</span><span class="o">.</span><span class="n">text_type</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">urlunquote</span><span class="p">(</span><span class="n">quoted_url</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> A wrapper for Python's urllib.unquote() function that can operate on</span>
<span class="sd"> the result of django.utils.http.urlquote().</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">force_text</span><span class="p">(</span><span class="n">unquote</span><span class="p">(</span><span class="n">force_str</span><span class="p">(</span><span class="n">quoted_url</span><span class="p">)))</span>
<span class="n">urlunquote</span> <span class="o">=</span> <span class="n">allow_lazy</span><span class="p">(</span><span class="n">urlunquote</span><span class="p">,</span> <span class="n">six</span><span class="o">.</span><span class="n">text_type</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">urlunquote_plus</span><span class="p">(</span><span class="n">quoted_url</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> A wrapper for Python's urllib.unquote_plus() function that can operate on</span>
<span class="sd"> the result of django.utils.http.urlquote_plus().</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">force_text</span><span class="p">(</span><span class="n">unquote_plus</span><span class="p">(</span><span class="n">force_str</span><span class="p">(</span><span class="n">quoted_url</span><span class="p">)))</span>
<span class="n">urlunquote_plus</span> <span class="o">=</span> <span class="n">allow_lazy</span><span class="p">(</span><span class="n">urlunquote_plus</span><span class="p">,</span> <span class="n">six</span><span class="o">.</span><span class="n">text_type</span><span class="p">)</span>
<div class="viewcode-block" id="urlencode"><a class="viewcode-back" href="../../../ref/utils.html#django.utils.http.urlencode">[docs]</a><span class="k">def</span> <span class="nf">urlencode</span><span class="p">(</span><span class="n">query</span><span class="p">,</span> <span class="n">doseq</span><span class="o">=</span><span class="mi">0</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> A version of Python's urllib.urlencode() function that can operate on</span>
<span class="sd"> unicode strings. The parameters are first cast to UTF-8 encoded strings and</span>
<span class="sd"> then encoded as per normal.</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">query</span><span class="p">,</span> <span class="n">MultiValueDict</span><span class="p">):</span>
<span class="n">query</span> <span class="o">=</span> <span class="n">query</span><span class="o">.</span><span class="n">lists</span><span class="p">()</span>
<span class="k">elif</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">query</span><span class="p">,</span> <span class="s">'items'</span><span class="p">):</span>
<span class="n">query</span> <span class="o">=</span> <span class="n">query</span><span class="o">.</span><span class="n">items</span><span class="p">()</span>
<span class="k">return</span> <span class="n">original_urlencode</span><span class="p">(</span>
<span class="p">[(</span><span class="n">force_str</span><span class="p">(</span><span class="n">k</span><span class="p">),</span>
<span class="p">[</span><span class="n">force_str</span><span class="p">(</span><span class="n">i</span><span class="p">)</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="n">v</span><span class="p">]</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">v</span><span class="p">,</span> <span class="p">(</span><span class="nb">list</span><span class="p">,</span><span class="nb">tuple</span><span class="p">))</span> <span class="k">else</span> <span class="n">force_str</span><span class="p">(</span><span class="n">v</span><span class="p">))</span>
<span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">query</span><span class="p">],</span>
<span class="n">doseq</span><span class="p">)</span>
</div>
<div class="viewcode-block" id="cookie_date"><a class="viewcode-back" href="../../../ref/utils.html#django.utils.http.cookie_date">[docs]</a><span class="k">def</span> <span class="nf">cookie_date</span><span class="p">(</span><span class="n">epoch_seconds</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Formats the time to ensure compatibility with Netscape's cookie standard.</span>
<span class="sd"> Accepts a floating point number expressed in seconds since the epoch, in</span>
<span class="sd"> UTC - such as that outputted by time.time(). If set to None, defaults to</span>
<span class="sd"> the current time.</span>
<span class="sd"> Outputs a string in the format 'Wdy, DD-Mon-YYYY HH:MM:SS GMT'.</span>
<span class="sd"> """</span>
<span class="n">rfcdate</span> <span class="o">=</span> <span class="n">formatdate</span><span class="p">(</span><span class="n">epoch_seconds</span><span class="p">)</span>
<span class="k">return</span> <span class="s">'</span><span class="si">%s</span><span class="s">-</span><span class="si">%s</span><span class="s">-</span><span class="si">%s</span><span class="s"> GMT'</span> <span class="o">%</span> <span class="p">(</span><span class="n">rfcdate</span><span class="p">[:</span><span class="mi">7</span><span class="p">],</span> <span class="n">rfcdate</span><span class="p">[</span><span class="mi">8</span><span class="p">:</span><span class="mi">11</span><span class="p">],</span> <span class="n">rfcdate</span><span class="p">[</span><span class="mi">12</span><span class="p">:</span><span class="mi">25</span><span class="p">])</span>
</div>
<div class="viewcode-block" id="http_date"><a class="viewcode-back" href="../../../ref/utils.html#django.utils.http.http_date">[docs]</a><span class="k">def</span> <span class="nf">http_date</span><span class="p">(</span><span class="n">epoch_seconds</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Formats the time to match the RFC1123 date format as specified by HTTP</span>
<span class="sd"> RFC2616 section 3.3.1.</span>
<span class="sd"> Accepts a floating point number expressed in seconds since the epoch, in</span>
<span class="sd"> UTC - such as that outputted by time.time(). If set to None, defaults to</span>
<span class="sd"> the current time.</span>
<span class="sd"> Outputs a string in the format 'Wdy, DD Mon YYYY HH:MM:SS GMT'.</span>
<span class="sd"> """</span>
<span class="n">rfcdate</span> <span class="o">=</span> <span class="n">formatdate</span><span class="p">(</span><span class="n">epoch_seconds</span><span class="p">)</span>
<span class="k">return</span> <span class="s">'</span><span class="si">%s</span><span class="s"> GMT'</span> <span class="o">%</span> <span class="n">rfcdate</span><span class="p">[:</span><span class="mi">25</span><span class="p">]</span>
</div>
<span class="k">def</span> <span class="nf">parse_http_date</span><span class="p">(</span><span class="n">date</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Parses a date format as specified by HTTP RFC2616 section 3.3.1.</span>
<span class="sd"> The three formats allowed by the RFC are accepted, even if only the first</span>
<span class="sd"> one is still in widespread use.</span>
<span class="sd"> Returns an integer expressed in seconds since the epoch, in UTC.</span>
<span class="sd"> """</span>
<span class="c"># emails.Util.parsedate does the job for RFC1123 dates; unfortunately</span>
<span class="c"># RFC2616 makes it mandatory to support RFC850 dates too. So we roll</span>
<span class="c"># our own RFC-compliant parsing.</span>
<span class="k">for</span> <span class="n">regex</span> <span class="ow">in</span> <span class="n">RFC1123_DATE</span><span class="p">,</span> <span class="n">RFC850_DATE</span><span class="p">,</span> <span class="n">ASCTIME_DATE</span><span class="p">:</span>
<span class="n">m</span> <span class="o">=</span> <span class="n">regex</span><span class="o">.</span><span class="n">match</span><span class="p">(</span><span class="n">date</span><span class="p">)</span>
<span class="k">if</span> <span class="n">m</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span><span class="p">:</span>
<span class="k">break</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s">"</span><span class="si">%r</span><span class="s"> is not in a valid HTTP date format"</span> <span class="o">%</span> <span class="n">date</span><span class="p">)</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">year</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">m</span><span class="o">.</span><span class="n">group</span><span class="p">(</span><span class="s">'year'</span><span class="p">))</span>
<span class="k">if</span> <span class="n">year</span> <span class="o"><</span> <span class="mi">100</span><span class="p">:</span>
<span class="k">if</span> <span class="n">year</span> <span class="o"><</span> <span class="mi">70</span><span class="p">:</span>
<span class="n">year</span> <span class="o">+=</span> <span class="mi">2000</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">year</span> <span class="o">+=</span> <span class="mi">1900</span>
<span class="n">month</span> <span class="o">=</span> <span class="n">MONTHS</span><span class="o">.</span><span class="n">index</span><span class="p">(</span><span class="n">m</span><span class="o">.</span><span class="n">group</span><span class="p">(</span><span class="s">'mon'</span><span class="p">)</span><span class="o">.</span><span class="n">lower</span><span class="p">())</span> <span class="o">+</span> <span class="mi">1</span>
<span class="n">day</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">m</span><span class="o">.</span><span class="n">group</span><span class="p">(</span><span class="s">'day'</span><span class="p">))</span>
<span class="n">hour</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">m</span><span class="o">.</span><span class="n">group</span><span class="p">(</span><span class="s">'hour'</span><span class="p">))</span>
<span class="nb">min</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">m</span><span class="o">.</span><span class="n">group</span><span class="p">(</span><span class="s">'min'</span><span class="p">))</span>
<span class="n">sec</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">m</span><span class="o">.</span><span class="n">group</span><span class="p">(</span><span class="s">'sec'</span><span class="p">))</span>
<span class="n">result</span> <span class="o">=</span> <span class="n">datetime</span><span class="o">.</span><span class="n">datetime</span><span class="p">(</span><span class="n">year</span><span class="p">,</span> <span class="n">month</span><span class="p">,</span> <span class="n">day</span><span class="p">,</span> <span class="n">hour</span><span class="p">,</span> <span class="nb">min</span><span class="p">,</span> <span class="n">sec</span><span class="p">)</span>
<span class="k">return</span> <span class="n">calendar</span><span class="o">.</span><span class="n">timegm</span><span class="p">(</span><span class="n">result</span><span class="o">.</span><span class="n">utctimetuple</span><span class="p">())</span>
<span class="k">except</span> <span class="ne">Exception</span><span class="p">:</span>
<span class="n">six</span><span class="o">.</span><span class="n">reraise</span><span class="p">(</span><span class="ne">ValueError</span><span class="p">,</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s">"</span><span class="si">%r</span><span class="s"> is not a valid date"</span> <span class="o">%</span> <span class="n">date</span><span class="p">),</span> <span class="n">sys</span><span class="o">.</span><span class="n">exc_info</span><span class="p">()[</span><span class="mi">2</span><span class="p">])</span>
<span class="k">def</span> <span class="nf">parse_http_date_safe</span><span class="p">(</span><span class="n">date</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Same as parse_http_date, but returns None if the input is invalid.</span>
<span class="sd"> """</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">return</span> <span class="n">parse_http_date</span><span class="p">(</span><span class="n">date</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">Exception</span><span class="p">:</span>
<span class="k">pass</span>
<span class="c"># Base 36 functions: useful for generating compact URLs</span>
<div class="viewcode-block" id="base36_to_int"><a class="viewcode-back" href="../../../ref/utils.html#django.utils.http.base36_to_int">[docs]</a><span class="k">def</span> <span class="nf">base36_to_int</span><span class="p">(</span><span class="n">s</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Converts a base 36 string to an ``int``. Raises ``ValueError` if the</span>
<span class="sd"> input won't fit into an int.</span>
<span class="sd"> """</span>
<span class="c"># To prevent overconsumption of server resources, reject any</span>
<span class="c"># base36 string that is long than 13 base36 digits (13 digits</span>
<span class="c"># is sufficient to base36-encode any 64-bit integer)</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">s</span><span class="p">)</span> <span class="o">></span> <span class="mi">13</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s">"Base36 input too large"</span><span class="p">)</span>
<span class="n">value</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">s</span><span class="p">,</span> <span class="mi">36</span><span class="p">)</span>
<span class="c"># ... then do a final check that the value will fit into an int to avoid</span>
<span class="c"># returning a long (#15067). The long type was removed in Python 3.</span>
<span class="k">if</span> <span class="n">six</span><span class="o">.</span><span class="n">PY2</span> <span class="ow">and</span> <span class="n">value</span> <span class="o">></span> <span class="n">sys</span><span class="o">.</span><span class="n">maxint</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s">"Base36 input too large"</span><span class="p">)</span>
<span class="k">return</span> <span class="n">value</span>
</div>
<div class="viewcode-block" id="int_to_base36"><a class="viewcode-back" href="../../../ref/utils.html#django.utils.http.int_to_base36">[docs]</a><span class="k">def</span> <span class="nf">int_to_base36</span><span class="p">(</span><span class="n">i</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Converts an integer to a base36 string</span>
<span class="sd"> """</span>
<span class="n">digits</span> <span class="o">=</span> <span class="s">"0123456789abcdefghijklmnopqrstuvwxyz"</span>
<span class="n">factor</span> <span class="o">=</span> <span class="mi">0</span>
<span class="k">if</span> <span class="n">i</span> <span class="o"><</span> <span class="mi">0</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s">"Negative base36 conversion input."</span><span class="p">)</span>
<span class="k">if</span> <span class="n">six</span><span class="o">.</span><span class="n">PY2</span><span class="p">:</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">i</span><span class="p">,</span> <span class="n">six</span><span class="o">.</span><span class="n">integer_types</span><span class="p">):</span>
<span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="s">"Non-integer base36 conversion input."</span><span class="p">)</span>
<span class="k">if</span> <span class="n">i</span> <span class="o">></span> <span class="n">sys</span><span class="o">.</span><span class="n">maxint</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s">"Base36 conversion input too large."</span><span class="p">)</span>
<span class="c"># Find starting factor</span>
<span class="k">while</span> <span class="bp">True</span><span class="p">:</span>
<span class="n">factor</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="k">if</span> <span class="n">i</span> <span class="o"><</span> <span class="mi">36</span> <span class="o">**</span> <span class="n">factor</span><span class="p">:</span>
<span class="n">factor</span> <span class="o">-=</span> <span class="mi">1</span>
<span class="k">break</span>
<span class="n">base36</span> <span class="o">=</span> <span class="p">[]</span>
<span class="c"># Construct base36 representation</span>
<span class="k">while</span> <span class="n">factor</span> <span class="o">>=</span> <span class="mi">0</span><span class="p">:</span>
<span class="n">j</span> <span class="o">=</span> <span class="mi">36</span> <span class="o">**</span> <span class="n">factor</span>
<span class="n">base36</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">digits</span><span class="p">[</span><span class="n">i</span> <span class="o">//</span> <span class="n">j</span><span class="p">])</span>
<span class="n">i</span> <span class="o">=</span> <span class="n">i</span> <span class="o">%</span> <span class="n">j</span>
<span class="n">factor</span> <span class="o">-=</span> <span class="mi">1</span>
<span class="k">return</span> <span class="s">''</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">base36</span><span class="p">)</span>
</div>
<div class="viewcode-block" id="urlsafe_base64_encode"><a class="viewcode-back" href="../../../ref/utils.html#django.utils.http.urlsafe_base64_encode">[docs]</a><span class="k">def</span> <span class="nf">urlsafe_base64_encode</span><span class="p">(</span><span class="n">s</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Encodes a bytestring in base64 for use in URLs, stripping any trailing</span>
<span class="sd"> equal signs.</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">base64</span><span class="o">.</span><span class="n">urlsafe_b64encode</span><span class="p">(</span><span class="n">s</span><span class="p">)</span><span class="o">.</span><span class="n">rstrip</span><span class="p">(</span><span class="n">b</span><span class="s">'</span><span class="se">\n</span><span class="s">='</span><span class="p">)</span>
</div>
<div class="viewcode-block" id="urlsafe_base64_decode"><a class="viewcode-back" href="../../../ref/utils.html#django.utils.http.urlsafe_base64_decode">[docs]</a><span class="k">def</span> <span class="nf">urlsafe_base64_decode</span><span class="p">(</span><span class="n">s</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Decodes a base64 encoded string, adding back any trailing equal signs that</span>
<span class="sd"> might have been stripped.</span>
<span class="sd"> """</span>
<span class="n">s</span> <span class="o">=</span> <span class="n">s</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s">'utf-8'</span><span class="p">)</span> <span class="c"># base64encode should only return ASCII.</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">return</span> <span class="n">base64</span><span class="o">.</span><span class="n">urlsafe_b64decode</span><span class="p">(</span><span class="n">s</span><span class="o">.</span><span class="n">ljust</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">s</span><span class="p">)</span> <span class="o">+</span> <span class="nb">len</span><span class="p">(</span><span class="n">s</span><span class="p">)</span> <span class="o">%</span> <span class="mi">4</span><span class="p">,</span> <span class="n">b</span><span class="s">'='</span><span class="p">))</span>
<span class="k">except</span> <span class="p">(</span><span class="ne">LookupError</span><span class="p">,</span> <span class="n">BinasciiError</span><span class="p">)</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="n">e</span><span class="p">)</span>
</div>
<span class="k">def</span> <span class="nf">parse_etags</span><span class="p">(</span><span class="n">etag_str</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Parses a string with one or several etags passed in If-None-Match and</span>
<span class="sd"> If-Match headers by the rules in RFC 2616. Returns a list of etags</span>
<span class="sd"> without surrounding double quotes (") and unescaped from \<CHAR>.</span>
<span class="sd"> """</span>
<span class="n">etags</span> <span class="o">=</span> <span class="n">ETAG_MATCH</span><span class="o">.</span><span class="n">findall</span><span class="p">(</span><span class="n">etag_str</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">etags</span><span class="p">:</span>
<span class="c"># etag_str has wrong format, treat it as an opaque string then</span>
<span class="k">return</span> <span class="p">[</span><span class="n">etag_str</span><span class="p">]</span>
<span class="n">etags</span> <span class="o">=</span> <span class="p">[</span><span class="n">e</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s">'ascii'</span><span class="p">)</span><span class="o">.</span><span class="n">decode</span><span class="p">(</span><span class="s">'unicode_escape'</span><span class="p">)</span> <span class="k">for</span> <span class="n">e</span> <span class="ow">in</span> <span class="n">etags</span><span class="p">]</span>
<span class="k">return</span> <span class="n">etags</span>
<span class="k">def</span> <span class="nf">quote_etag</span><span class="p">(</span><span class="n">etag</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Wraps a string in double quotes escaping contents as necessary.</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="s">'"</span><span class="si">%s</span><span class="s">"'</span> <span class="o">%</span> <span class="n">etag</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="s">'</span><span class="se">\\</span><span class="s">'</span><span class="p">,</span> <span class="s">'</span><span class="se">\\\\</span><span class="s">'</span><span class="p">)</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="s">'"'</span><span class="p">,</span> <span class="s">'</span><span class="se">\\</span><span class="s">"'</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">same_origin</span><span class="p">(</span><span class="n">url1</span><span class="p">,</span> <span class="n">url2</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Checks if two URLs are 'same-origin'</span>
<span class="sd"> """</span>
<span class="n">p1</span><span class="p">,</span> <span class="n">p2</span> <span class="o">=</span> <span class="n">urlparse</span><span class="p">(</span><span class="n">url1</span><span class="p">),</span> <span class="n">urlparse</span><span class="p">(</span><span class="n">url2</span><span class="p">)</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">return</span> <span class="p">(</span><span class="n">p1</span><span class="o">.</span><span class="n">scheme</span><span class="p">,</span> <span class="n">p1</span><span class="o">.</span><span class="n">hostname</span><span class="p">,</span> <span class="n">p1</span><span class="o">.</span><span class="n">port</span><span class="p">)</span> <span class="o">==</span> <span class="p">(</span><span class="n">p2</span><span class="o">.</span><span class="n">scheme</span><span class="p">,</span> <span class="n">p2</span><span class="o">.</span><span class="n">hostname</span><span class="p">,</span> <span class="n">p2</span><span class="o">.</span><span class="n">port</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">ValueError</span><span class="p">:</span>
<span class="k">return</span> <span class="bp">False</span>
<span class="k">def</span> <span class="nf">is_safe_url</span><span class="p">(</span><span class="n">url</span><span class="p">,</span> <span class="n">host</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Return ``True`` if the url is a safe redirection (i.e. it doesn't point to</span>
<span class="sd"> a different host and uses a safe scheme).</span>
<span class="sd"> Always returns ``False`` on an empty url.</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">url</span><span class="p">:</span>
<span class="k">return</span> <span class="bp">False</span>
<span class="c"># Chrome treats \ completely as /</span>
<span class="n">url</span> <span class="o">=</span> <span class="n">url</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="s">'</span><span class="se">\\</span><span class="s">'</span><span class="p">,</span> <span class="s">'/'</span><span class="p">)</span>
<span class="c"># Chrome considers any URL with more than two slashes to be absolute, but</span>
<span class="c"># urlaprse is not so flexible. Treat any url with three slashes as unsafe.</span>
<span class="k">if</span> <span class="n">url</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s">'///'</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">False</span>
<span class="n">url_info</span> <span class="o">=</span> <span class="n">urlparse</span><span class="p">(</span><span class="n">url</span><span class="p">)</span>
<span class="c"># Forbid URLs like http:///example.com - with a scheme, but without a hostname.</span>
<span class="c"># In that URL, example.com is not the hostname but, a path component. However,</span>
<span class="c"># Chrome will still consider example.com to be the hostname, so we must not</span>
<span class="c"># allow this syntax.</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">url_info</span><span class="o">.</span><span class="n">netloc</span> <span class="ow">and</span> <span class="n">url_info</span><span class="o">.</span><span class="n">scheme</span><span class="p">:</span>
<span class="k">return</span> <span class="bp">False</span>
<span class="k">return</span> <span class="p">(</span><span class="ow">not</span> <span class="n">url_info</span><span class="o">.</span><span class="n">netloc</span> <span class="ow">or</span> <span class="n">url_info</span><span class="o">.</span><span class="n">netloc</span> <span class="o">==</span> <span class="n">host</span><span class="p">)</span> <span class="ow">and</span> \
<span class="p">(</span><span class="ow">not</span> <span class="n">url_info</span><span class="o">.</span><span class="n">scheme</span> <span class="ow">or</span> <span class="n">url_info</span><span class="o">.</span><span class="n">scheme</span> <span class="ow">in</span> <span class="p">[</span><span class="s">'http'</span><span class="p">,</span> <span class="s">'https'</span><span class="p">])</span>
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