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<td><strong>Module</strong></td>
<td class="class-name-in-header">Rack::Utils::Multipart</td>
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<td><strong>In:</strong></td>
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<a href="../../../files/lib/rack/utils_rb.html">
lib/rack/utils.rb
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<p>
A multipart form data parser, adapted from IOWA.
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<p>
Usually, <a href="../Request.html#M000177">Rack::Request#POST</a> takes
care of calling this.
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<h3 class="section-bar">Methods</h3>
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<a href="#M000028">parse_multipart</a>&nbsp;&nbsp;
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<h3 class="section-bar">Constants</h3>
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<td class="context-item-name">EOL</td>
<td>=</td>
<td class="context-item-value">&quot;\r\n&quot;</td>
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<h3 class="section-bar">Public Class methods</h3>
<div id="method-M000028" class="method-detail">
<a name="M000028"></a>
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<a href="#M000028" class="method-signature">
<span class="method-name">parse_multipart</span><span class="method-args">(env)</span>
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onclick="toggleCode('M000028-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000028-source">
<pre>
<span class="ruby-comment cmt"># File lib/rack/utils.rb, line 259</span>
259: <span class="ruby-keyword kw">def</span> <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">parse_multipart</span>(<span class="ruby-identifier">env</span>)
260: <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">env</span>[<span class="ruby-value str">'CONTENT_TYPE'</span>] <span class="ruby-operator">=~</span>
261: <span class="ruby-regexp re">%r|\Amultipart/form-data.*boundary=\&quot;?([^\&quot;;,]+)\&quot;?|n</span>
262: <span class="ruby-keyword kw">nil</span>
263: <span class="ruby-keyword kw">else</span>
264: <span class="ruby-identifier">boundary</span> = <span class="ruby-node">&quot;--#{$1}&quot;</span>
265:
266: <span class="ruby-identifier">params</span> = {}
267: <span class="ruby-identifier">buf</span> = <span class="ruby-value str">&quot;&quot;</span>
268: <span class="ruby-identifier">content_length</span> = <span class="ruby-identifier">env</span>[<span class="ruby-value str">'CONTENT_LENGTH'</span>].<span class="ruby-identifier">to_i</span>
269: <span class="ruby-identifier">input</span> = <span class="ruby-identifier">env</span>[<span class="ruby-value str">'rack.input'</span>]
270:
271: <span class="ruby-identifier">boundary_size</span> = <span class="ruby-identifier">boundary</span>.<span class="ruby-identifier">size</span> <span class="ruby-operator">+</span> <span class="ruby-constant">EOL</span>.<span class="ruby-identifier">size</span>
272: <span class="ruby-identifier">bufsize</span> = <span class="ruby-value">16384</span>
273:
274: <span class="ruby-identifier">content_length</span> <span class="ruby-operator">-=</span> <span class="ruby-identifier">boundary_size</span>
275:
276: <span class="ruby-identifier">status</span> = <span class="ruby-identifier">input</span>.<span class="ruby-identifier">read</span>(<span class="ruby-identifier">boundary_size</span>)
277: <span class="ruby-identifier">raise</span> <span class="ruby-constant">EOFError</span>, <span class="ruby-value str">&quot;bad content body&quot;</span> <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">status</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">boundary</span> <span class="ruby-operator">+</span> <span class="ruby-constant">EOL</span>
278:
279: <span class="ruby-identifier">rx</span> = <span class="ruby-node">/(?:#{EOL})?#{Regexp.quote boundary}(#{EOL}|--)/</span>
280:
281: <span class="ruby-identifier">loop</span> {
282: <span class="ruby-identifier">head</span> = <span class="ruby-keyword kw">nil</span>
283: <span class="ruby-identifier">body</span> = <span class="ruby-value str">''</span>
284: <span class="ruby-identifier">filename</span> = <span class="ruby-identifier">content_type</span> = <span class="ruby-identifier">name</span> = <span class="ruby-keyword kw">nil</span>
285:
286: <span class="ruby-keyword kw">until</span> <span class="ruby-identifier">head</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">buf</span> <span class="ruby-operator">=~</span> <span class="ruby-identifier">rx</span>
287: <span class="ruby-keyword kw">if</span> <span class="ruby-operator">!</span><span class="ruby-identifier">head</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">i</span> = <span class="ruby-identifier">buf</span>.<span class="ruby-identifier">index</span>(<span class="ruby-value str">&quot;\r\n\r\n&quot;</span>)
288: <span class="ruby-identifier">head</span> = <span class="ruby-identifier">buf</span>.<span class="ruby-identifier">slice!</span>(<span class="ruby-value">0</span>, <span class="ruby-identifier">i</span><span class="ruby-operator">+</span><span class="ruby-value">2</span>) <span class="ruby-comment cmt"># First \r\n</span>
289: <span class="ruby-identifier">buf</span>.<span class="ruby-identifier">slice!</span>(<span class="ruby-value">0</span>, <span class="ruby-value">2</span>) <span class="ruby-comment cmt"># Second \r\n</span>
290:
291: <span class="ruby-identifier">filename</span> = <span class="ruby-identifier">head</span>[<span class="ruby-regexp re">/Content-Disposition:.* filename=&quot;?([^\&quot;;]*)&quot;?/n</span><span class="ruby-identifier">i</span>, <span class="ruby-value">1</span>]
292: <span class="ruby-identifier">content_type</span> = <span class="ruby-identifier">head</span>[<span class="ruby-regexp re">/Content-Type: (.*)\r\n/n</span><span class="ruby-identifier">i</span>, <span class="ruby-value">1</span>]
293: <span class="ruby-identifier">name</span> = <span class="ruby-identifier">head</span>[<span class="ruby-regexp re">/Content-Disposition:.* name=&quot;?([^\&quot;;]*)&quot;?/n</span><span class="ruby-identifier">i</span>, <span class="ruby-value">1</span>]
294:
295: <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">filename</span>
296: <span class="ruby-identifier">body</span> = <span class="ruby-constant">Tempfile</span>.<span class="ruby-identifier">new</span>(<span class="ruby-value str">&quot;RackMultipart&quot;</span>)
297: <span class="ruby-identifier">body</span>.<span class="ruby-identifier">binmode</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">body</span>.<span class="ruby-identifier">respond_to?</span>(<span class="ruby-identifier">:binmode</span>)
298: <span class="ruby-keyword kw">end</span>
299:
300: <span class="ruby-keyword kw">next</span>
301: <span class="ruby-keyword kw">end</span>
302:
303: <span class="ruby-comment cmt"># Save the read body part.</span>
304: <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">head</span> <span class="ruby-operator">&amp;&amp;</span> (<span class="ruby-identifier">boundary_size</span><span class="ruby-operator">+</span><span class="ruby-value">4</span> <span class="ruby-operator">&lt;</span> <span class="ruby-identifier">buf</span>.<span class="ruby-identifier">size</span>)
305: <span class="ruby-identifier">body</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">buf</span>.<span class="ruby-identifier">slice!</span>(<span class="ruby-value">0</span>, <span class="ruby-identifier">buf</span>.<span class="ruby-identifier">size</span> <span class="ruby-operator">-</span> (<span class="ruby-identifier">boundary_size</span><span class="ruby-operator">+</span><span class="ruby-value">4</span>))
306: <span class="ruby-keyword kw">end</span>
307:
308: <span class="ruby-identifier">c</span> = <span class="ruby-identifier">input</span>.<span class="ruby-identifier">read</span>(<span class="ruby-identifier">bufsize</span> <span class="ruby-operator">&lt;</span> <span class="ruby-identifier">content_length</span> <span class="ruby-value">? </span><span class="ruby-identifier">bufsize</span> <span class="ruby-operator">:</span> <span class="ruby-identifier">content_length</span>)
309: <span class="ruby-identifier">raise</span> <span class="ruby-constant">EOFError</span>, <span class="ruby-value str">&quot;bad content body&quot;</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">c</span>.<span class="ruby-identifier">nil?</span> <span class="ruby-operator">||</span> <span class="ruby-identifier">c</span>.<span class="ruby-identifier">empty?</span>
310: <span class="ruby-identifier">buf</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">c</span>
311: <span class="ruby-identifier">content_length</span> <span class="ruby-operator">-=</span> <span class="ruby-identifier">c</span>.<span class="ruby-identifier">size</span>
312: <span class="ruby-keyword kw">end</span>
313:
314: <span class="ruby-comment cmt"># Save the rest.</span>
315: <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">i</span> = <span class="ruby-identifier">buf</span>.<span class="ruby-identifier">index</span>(<span class="ruby-identifier">rx</span>)
316: <span class="ruby-identifier">body</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">buf</span>.<span class="ruby-identifier">slice!</span>(<span class="ruby-value">0</span>, <span class="ruby-identifier">i</span>)
317: <span class="ruby-identifier">buf</span>.<span class="ruby-identifier">slice!</span>(<span class="ruby-value">0</span>, <span class="ruby-identifier">boundary_size</span><span class="ruby-operator">+</span><span class="ruby-value">2</span>)
318:
319: <span class="ruby-identifier">content_length</span> = <span class="ruby-value">-1</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">$1</span> <span class="ruby-operator">==</span> <span class="ruby-value str">&quot;--&quot;</span>
320: <span class="ruby-keyword kw">end</span>
321:
322: <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">filename</span>
323: <span class="ruby-identifier">body</span>.<span class="ruby-identifier">rewind</span>
324: <span class="ruby-identifier">data</span> = {<span class="ruby-identifier">:filename</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">filename</span>, <span class="ruby-identifier">:type</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">content_type</span>,
325: <span class="ruby-identifier">:name</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">name</span>, <span class="ruby-identifier">:tempfile</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">body</span>, <span class="ruby-identifier">:head</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">head</span>}
326: <span class="ruby-keyword kw">else</span>
327: <span class="ruby-identifier">data</span> = <span class="ruby-identifier">body</span>
328: <span class="ruby-keyword kw">end</span>
329:
330: <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">name</span>
331: <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">name</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/\[\]\z/</span>
332: <span class="ruby-identifier">params</span>[<span class="ruby-identifier">name</span>] <span class="ruby-operator">||=</span> []
333: <span class="ruby-identifier">params</span>[<span class="ruby-identifier">name</span>] <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">data</span>
334: <span class="ruby-keyword kw">else</span>
335: <span class="ruby-identifier">params</span>[<span class="ruby-identifier">name</span>] = <span class="ruby-identifier">data</span>
336: <span class="ruby-keyword kw">end</span>
337: <span class="ruby-keyword kw">end</span>
338:
339: <span class="ruby-keyword kw">break</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">buf</span>.<span class="ruby-identifier">empty?</span> <span class="ruby-operator">||</span> <span class="ruby-identifier">content_length</span> <span class="ruby-operator">==</span> <span class="ruby-value">-1</span>
340: }
341:
342: <span class="ruby-identifier">params</span>
343: <span class="ruby-keyword kw">end</span>
344: <span class="ruby-keyword kw">end</span>
</pre>
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