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<h1>Source code for django.core.files.base</h1><div class="highlight"><pre>
<span></span><span class="kn">from</span> <span class="nn">__future__</span> <span class="k">import</span> <span class="n">unicode_literals</span>
<span class="kn">import</span> <span class="nn">os</span>
<span class="kn">from</span> <span class="nn">io</span> <span class="k">import</span> <span class="n">BytesIO</span><span class="p">,</span> <span class="n">StringIO</span><span class="p">,</span> <span class="n">UnsupportedOperation</span>
<span class="kn">from</span> <span class="nn">django.core.files.utils</span> <span class="k">import</span> <span class="n">FileProxyMixin</span>
<span class="kn">from</span> <span class="nn">django.utils</span> <span class="k">import</span> <span class="n">six</span>
<span class="kn">from</span> <span class="nn">django.utils.encoding</span> <span class="k">import</span> <span class="p">(</span>
<span class="n">force_bytes</span><span class="p">,</span> <span class="n">force_str</span><span class="p">,</span> <span class="n">python_2_unicode_compatible</span><span class="p">,</span> <span class="n">smart_text</span><span class="p">,</span>
<span class="p">)</span>
<span class="nd">@python_2_unicode_compatible</span>
<div class="viewcode-block" id="File"><a class="viewcode-back" href="../../../../ref/files/file.html#django.core.files.File">[docs]</a><span class="k">class</span> <span class="nc">File</span><span class="p">(</span><span class="n">FileProxyMixin</span><span class="p">):</span>
<span class="n">DEFAULT_CHUNK_SIZE</span> <span class="o">=</span> <span class="mi">64</span> <span class="o">*</span> <span class="mi">2</span> <span class="o">**</span> <span class="mi">10</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="n">file</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">file</span> <span class="o">=</span> <span class="n">file</span>
<span class="k">if</span> <span class="n">name</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">name</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">file</span><span class="p">,</span> <span class="s1">'name'</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">name</span> <span class="o">=</span> <span class="n">name</span>
<span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">file</span><span class="p">,</span> <span class="s1">'mode'</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">mode</span> <span class="o">=</span> <span class="n">file</span><span class="o">.</span><span class="n">mode</span>
<span class="k">def</span> <span class="nf">__str__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="n">smart_text</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">name</span> <span class="ow">or</span> <span class="s1">''</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__repr__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="n">force_str</span><span class="p">(</span><span class="s2">"<</span><span class="si">%s</span><span class="s2">: </span><span class="si">%s</span><span class="s2">>"</span> <span class="o">%</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">__class__</span><span class="o">.</span><span class="n">__name__</span><span class="p">,</span> <span class="bp">self</span> <span class="ow">or</span> <span class="s2">"None"</span><span class="p">))</span>
<span class="k">def</span> <span class="nf">__bool__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="nb">bool</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__nonzero__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="c1"># Python 2 compatibility</span>
<span class="k">return</span> <span class="nb">type</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">__bool__</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__len__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">size</span>
<span class="k">def</span> <span class="nf">_get_size_from_underlying_file</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">file</span><span class="p">,</span> <span class="s1">'size'</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">file</span><span class="o">.</span><span class="n">size</span>
<span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">file</span><span class="p">,</span> <span class="s1">'name'</span><span class="p">):</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">return</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">getsize</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">file</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="k">except</span> <span class="p">(</span><span class="ne">OSError</span><span class="p">,</span> <span class="ne">TypeError</span><span class="p">):</span>
<span class="k">pass</span>
<span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">file</span><span class="p">,</span> <span class="s1">'tell'</span><span class="p">)</span> <span class="ow">and</span> <span class="nb">hasattr</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">file</span><span class="p">,</span> <span class="s1">'seek'</span><span class="p">):</span>
<span class="n">pos</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">file</span><span class="o">.</span><span class="n">tell</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">file</span><span class="o">.</span><span class="n">seek</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="n">os</span><span class="o">.</span><span class="n">SEEK_END</span><span class="p">)</span>
<span class="n">size</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">file</span><span class="o">.</span><span class="n">tell</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">file</span><span class="o">.</span><span class="n">seek</span><span class="p">(</span><span class="n">pos</span><span class="p">)</span>
<span class="k">return</span> <span class="n">size</span>
<span class="k">raise</span> <span class="ne">AttributeError</span><span class="p">(</span><span class="s2">"Unable to determine the file's size."</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">_get_size</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="s1">'_size'</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_size</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_size</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_get_size_from_underlying_file</span><span class="p">()</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_size</span>
<span class="k">def</span> <span class="nf">_set_size</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">size</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_size</span> <span class="o">=</span> <span class="n">size</span>
<span class="n">size</span> <span class="o">=</span> <span class="nb">property</span><span class="p">(</span><span class="n">_get_size</span><span class="p">,</span> <span class="n">_set_size</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">_get_closed</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">file</span> <span class="ow">or</span> <span class="bp">self</span><span class="o">.</span><span class="n">file</span><span class="o">.</span><span class="n">closed</span>
<span class="n">closed</span> <span class="o">=</span> <span class="nb">property</span><span class="p">(</span><span class="n">_get_closed</span><span class="p">)</span>
<div class="viewcode-block" id="File.chunks"><a class="viewcode-back" href="../../../../ref/files/file.html#django.core.files.File.chunks">[docs]</a> <span class="k">def</span> <span class="nf">chunks</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">chunk_size</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Read the file and yield chunks of ``chunk_size`` bytes (defaults to</span>
<span class="sd"> ``UploadedFile.DEFAULT_CHUNK_SIZE``).</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">chunk_size</span><span class="p">:</span>
<span class="n">chunk_size</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">DEFAULT_CHUNK_SIZE</span>
<span class="k">try</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">seek</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="k">except</span> <span class="p">(</span><span class="ne">AttributeError</span><span class="p">,</span> <span class="n">UnsupportedOperation</span><span class="p">):</span>
<span class="k">pass</span>
<span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
<span class="n">data</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="n">chunk_size</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">data</span><span class="p">:</span>
<span class="k">break</span>
<span class="k">yield</span> <span class="n">data</span></div>
<div class="viewcode-block" id="File.multiple_chunks"><a class="viewcode-back" href="../../../../ref/files/file.html#django.core.files.File.multiple_chunks">[docs]</a> <span class="k">def</span> <span class="nf">multiple_chunks</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">chunk_size</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Returns ``True`` if you can expect multiple chunks.</span>
<span class="sd"> NB: If a particular file representation is in memory, subclasses should</span>
<span class="sd"> always return ``False`` -- there's no good reason to read from memory in</span>
<span class="sd"> chunks.</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">chunk_size</span><span class="p">:</span>
<span class="n">chunk_size</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">DEFAULT_CHUNK_SIZE</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">size</span> <span class="o">></span> <span class="n">chunk_size</span></div>
<div class="viewcode-block" id="File.__iter__"><a class="viewcode-back" href="../../../../ref/files/file.html#django.core.files.File.__iter__">[docs]</a> <span class="k">def</span> <span class="nf">__iter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># Iterate over this file-like object by newlines</span>
<span class="n">buffer_</span> <span class="o">=</span> <span class="kc">None</span>
<span class="k">for</span> <span class="n">chunk</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">chunks</span><span class="p">():</span>
<span class="k">for</span> <span class="n">line</span> <span class="ow">in</span> <span class="n">chunk</span><span class="o">.</span><span class="n">splitlines</span><span class="p">(</span><span class="kc">True</span><span class="p">):</span>
<span class="k">if</span> <span class="n">buffer_</span><span class="p">:</span>
<span class="k">if</span> <span class="n">endswith_cr</span><span class="p">(</span><span class="n">buffer_</span><span class="p">)</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">equals_lf</span><span class="p">(</span><span class="n">line</span><span class="p">):</span>
<span class="c1"># Line split after a \r newline; yield buffer_.</span>
<span class="k">yield</span> <span class="n">buffer_</span>
<span class="c1"># Continue with line.</span>
<span class="k">else</span><span class="p">:</span>
<span class="c1"># Line either split without a newline (line</span>
<span class="c1"># continues after buffer_) or with \r\n</span>
<span class="c1"># newline (line == b'\n').</span>
<span class="n">line</span> <span class="o">=</span> <span class="n">buffer_</span> <span class="o">+</span> <span class="n">line</span>
<span class="c1"># buffer_ handled, clear it.</span>
<span class="n">buffer_</span> <span class="o">=</span> <span class="kc">None</span>
<span class="c1"># If this is the end of a \n or \r\n line, yield.</span>
<span class="k">if</span> <span class="n">endswith_lf</span><span class="p">(</span><span class="n">line</span><span class="p">):</span>
<span class="k">yield</span> <span class="n">line</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">buffer_</span> <span class="o">=</span> <span class="n">line</span>
<span class="k">if</span> <span class="n">buffer_</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">yield</span> <span class="n">buffer_</span></div>
<span class="k">def</span> <span class="nf">__enter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span>
<span class="k">def</span> <span class="nf">__exit__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">exc_type</span><span class="p">,</span> <span class="n">exc_value</span><span class="p">,</span> <span class="n">tb</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
<div class="viewcode-block" id="File.open"><a class="viewcode-back" href="../../../../ref/files/file.html#django.core.files.File.open">[docs]</a> <span class="k">def</span> <span class="nf">open</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">mode</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">closed</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">seek</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="k">elif</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span> <span class="ow">and</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">exists</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">file</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="n">mode</span> <span class="ow">or</span> <span class="bp">self</span><span class="o">.</span><span class="n">mode</span><span class="p">)</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="s2">"The file cannot be reopened."</span><span class="p">)</span></div>
<div class="viewcode-block" id="File.close"><a class="viewcode-back" href="../../../../ref/files/file.html#django.core.files.File.close">[docs]</a> <span class="k">def</span> <span class="nf">close</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">file</span><span class="o">.</span><span class="n">close</span><span class="p">()</span></div></div>
<span class="nd">@python_2_unicode_compatible</span>
<div class="viewcode-block" id="ContentFile"><a class="viewcode-back" href="../../../../ref/files/file.html#django.core.files.ContentFile">[docs]</a><span class="k">class</span> <span class="nc">ContentFile</span><span class="p">(</span><span class="n">File</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> A File-like object that takes just raw content, rather than an actual file.</span>
<span class="sd"> """</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="n">content</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="k">if</span> <span class="n">six</span><span class="o">.</span><span class="n">PY3</span><span class="p">:</span>
<span class="n">stream_class</span> <span class="o">=</span> <span class="n">StringIO</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">content</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">else</span> <span class="n">BytesIO</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">stream_class</span> <span class="o">=</span> <span class="n">BytesIO</span>
<span class="n">content</span> <span class="o">=</span> <span class="n">force_bytes</span><span class="p">(</span><span class="n">content</span><span class="p">)</span>
<span class="nb">super</span><span class="p">(</span><span class="n">ContentFile</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="n">stream_class</span><span class="p">(</span><span class="n">content</span><span class="p">),</span> <span class="n">name</span><span class="o">=</span><span class="n">name</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">size</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="n">content</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__str__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="s1">'Raw content'</span>
<span class="k">def</span> <span class="nf">__bool__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="kc">True</span>
<span class="k">def</span> <span class="nf">__nonzero__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="c1"># Python 2 compatibility</span>
<span class="k">return</span> <span class="nb">type</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">__bool__</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">open</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">mode</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">seek</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">close</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">pass</span></div>
<span class="k">def</span> <span class="nf">endswith_cr</span><span class="p">(</span><span class="n">line</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Return True if line (a text or byte string) ends with '\r'.</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">line</span><span class="o">.</span><span class="n">endswith</span><span class="p">(</span><span class="s1">'</span><span class="se">\r</span><span class="s1">'</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">line</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">else</span> <span class="n">b</span><span class="s1">'</span><span class="se">\r</span><span class="s1">'</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">endswith_lf</span><span class="p">(</span><span class="n">line</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Return True if line (a text or byte string) ends with '\n'.</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">line</span><span class="o">.</span><span class="n">endswith</span><span class="p">(</span><span class="s1">'</span><span class="se">\n</span><span class="s1">'</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">line</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">else</span> <span class="n">b</span><span class="s1">'</span><span class="se">\n</span><span class="s1">'</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">equals_lf</span><span class="p">(</span><span class="n">line</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Return True if line (a text or byte string) equals '\n'.</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">line</span> <span class="o">==</span> <span class="p">(</span><span class="s1">'</span><span class="se">\n</span><span class="s1">'</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">line</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">else</span> <span class="n">b</span><span class="s1">'</span><span class="se">\n</span><span class="s1">'</span><span class="p">)</span>
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