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node_modules/connect/lib/middleware/multipart.js

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+/*!
+ * Connect - multipart
+ * Copyright(c) 2010 Sencha Inc.
+ * Copyright(c) 2011 TJ Holowaychuk
+ * MIT Licensed
+ */
+
+/**
+ * Module dependencies.
+ */
+
+var formidable = require('formidable')
+  , _limit = require('./limit')
+  , utils = require('../utils')
+  , qs = require('qs');
+
+/**
+ * noop middleware.
+ */
+
+function noop(req, res, next) {
+  next();
+}
+
+/**
+ * Multipart:
+ * 
+ * Parse multipart/form-data request bodies,
+ * providing the parsed object as `req.body`
+ * and `req.files`.
+ *
+ * Configuration:
+ *
+ *  The options passed are merged with [formidable](https://github.com/felixge/node-formidable)'s
+ *  `IncomingForm` object, allowing you to configure the upload directory,
+ *  size limits, etc. For example if you wish to change the upload dir do the following.
+ *
+ *     app.use(connect.multipart({ uploadDir: path }));
+ *
+ * Options:
+ *
+ *   - `limit`  byte limit defaulting to none
+ *   - `defer`  defers processing and exposes the Formidable form object as `req.form`.
+ *              `next()` is called without waiting for the form's "end" event.
+ *              This option is useful if you need to bind to the "progress" event, for example.
+ *
+ * @param {Object} options
+ * @return {Function}
+ * @api public
+ */
+
+exports = module.exports = function(options){
+  options = options || {};
+
+  var limit = options.limit
+    ? _limit(options.limit)
+    : noop;
+
+  return function multipart(req, res, next) {
+    if (req._body) return next();
+    req.body = req.body || {};
+    req.files = req.files || {};
+
+    if (!utils.hasBody(req)) return next();
+
+    // ignore GET
+    if ('GET' == req.method || 'HEAD' == req.method) return next();
+
+    // check Content-Type
+    if ('multipart/form-data' != utils.mime(req)) return next();
+
+    // flag as parsed
+    req._body = true;
+
+    // parse
+    limit(req, res, function(err){
+      if (err) return next(err);
+
+      var form = new formidable.IncomingForm
+        , data = {}
+        , files = {}
+        , done;
+
+      Object.keys(options).forEach(function(key){
+        form[key] = options[key];
+      });
+
+      function ondata(name, val, data){
+        if (Array.isArray(data[name])) {
+          data[name].push(val);
+        } else if (data[name]) {
+          data[name] = [data[name], val];
+        } else {
+          data[name] = val;
+        }
+      }
+
+      form.on('field', function(name, val){
+        ondata(name, val, data);
+      });
+
+      form.on('file', function(name, val){
+        ondata(name, val, files);
+      });
+
+      form.on('error', function(err){
+        if (!options.defer) {
+          err.status = 400;
+          next(err);
+        }
+        done = true;
+      });
+
+      form.on('end', function(){
+        if (done) return;
+        try {
+          req.body = qs.parse(data);
+          req.files = qs.parse(files);
+          if (!options.defer) next();
+        } catch (err) {
+          form.emit('error', err);
+        }
+      });
+
+      form.parse(req);
+
+      if (options.defer) {
+        req.form = form;
+        next();
+      }
+    });
+  }
+};