src/multipart.js

   1 /* jshint node:true */
   2
   3 'use strict';
   4
   5 var multiparty = require('multiparty'),
   6     timeout = require('connect-timeout');
   7
   8 function _mime(req) {
   9   var str = req.headers['content-type'] || '';
  10   return str.split(';')[0];
  11 }
  12
  13 module.exports = function multipart(options) {
  14     return function (req, res, next) {
  15         if (_mime(req) !== 'multipart/form-data') return next(null);
  16
  17         var form = new multiparty.Form({
  18             uploadDir: '/tmp',
  19             keepExtensions: true,
  20             maxFieldsSize: options.maxFieldsSize || (2 * 1024), // only field size, not files
  21             limit: options.limit || '500mb', // file sizes
  22             autoFiles: true
  23         });
  24
  25         // increase timeout of file uploads by default to 3 mins
  26         if (req.clearTimeout) req.clearTimeout(); // clear any previous installed timeout middleware
  27
  28         timeout(options.timeout || (3 * 60 * 1000))(req, res, function () {
  29             req.fields = { };
  30             req.files = { };
  31
  32             form.parse(req, function (err, fields, files) {
  33                 if (err) return res.status(400).send('Error parsing request');
  34                 next(null);
  35             });
  36
  37             form.on('file', function (name, file) {
  38                 req.files[name] = file;
  39             });
  40
  41             form.on('field', function (name, value) {
  42                 req.fields[name] = value; // otherwise fields.name is an array
  43             });
  44         });
  45     };
  46 };
  47