Node.js OAuth + multipart form uploading for Plurk uploadPicture

oauthmultipartform.js

var fs = require('fs');
var request = require('request');

/*
  var plurkTokens =
  { "consumer_key": "<key>"
  , "consumer_secret": "<secret>"
  , "token": "<token>"
  , "token_secret": "<secret>"
  };
*/

exports.uploadPicture = function(plurkTokens, filePath, afterImageURLReturned) {

  var plurk = "https://www.plurk.com"
  var postAPI = "/APP/Timeline/uploadPicture";

  var formData = {
    image: fs.createReadStream(filePath)
  };
  request.post({url: plurk + postAPI, oauth: plurkTokens, formData: formData},
  function(err, resp, body) {
    afterImageURLReturned(body);
  });
};