multipart-read-stream

Read a multipart stream over HTTP. Built on top of pez.

Usage

var multipart = require('multipart-read-stream')
var pump = require('pump')
var http = require('http')

http.createServer(function (req, res) {
  var multipartStream = multipart(req.headers, handler)

  pump(req, multipartStream, function (err) {
    if (err) res.end('server error')
    res.end()
  })

  function handler (fieldname, file, filename) {
    console.log('reading file ' + filename + ' from field ' + fieldname)
    var fileStream = fs.createWriteStream(path.join('/tmp', filename))
    pump(file, fileStream)
  }
}).listen(8080)

API

readableStream = multipart(headers, [options], fileHandler)

Create a new multipart stream handler. Takes the following arguments:

• headers: an object containing request headers (typically: req.headers)
• options: an object that is passed directly to pez
• filehandler(fieldname, file, filename, encoding, mimetype): handle a file. Each file is a readableStream

Events

multipart-read-stream returns an instance (from pez.Dispenser) which emits a number of multipart specific events:

readableStream.on('part', cb(stream))

The part event drives the fileHandler callback for the main API. The difference is it supplies a single parameter, the read stream of the file data of a multipart section.

readableStream.on('field', cb(name, value))

A field event is emitted for partitions containing key-value data (instead of file data).

readableStream.on('preamble', cb(str))

Multipart data may have a preamble section, which is typically ignored by parsers. However it's sometimes used as an area to contain hints/meta information.

readableStream.on('epilogue', cb(str))

As with the preamble section, the epilogue section essentially has the same role (ignored, but can be used for meta data), except it will be parsed after the body rather than before.

Installation

$ npm install --save multipart-read-stream

License

MIT