nodejs - standalone code to upload data to amazon s3

example.js

/*
  this standalone nodejs code requires the following env variables to be set:
  process.env.AWS_ACCESS_KEY_ID
  process.env.AWS_S3_BUCKET
  process.env.AWS_SECRET_ACCESS_KEY
*/
/*jslint
  bitwise: true, browser: true,
  indent: 2,
  maxerr: 8,
  node: true, nomen: true,
  regexp: true,
  stupid: true,
  todo: true
*/
(function () {
  'use strict';
  var options;
  // init options
  options = {
    // init content-type
    contentType: 'text/plain',
    // init date used in hmac signature
    date: new Date().toGMTString() + ' +0000',
    // init data to upload
    data: 'hello world!',
    // init https method
    method: 'PUT',
    // init s3 url endpoint for uploaded data
    // use env variable $AWS_S3_BUCKET
    url: 'https://' + process.env.AWS_S3_BUCKET + '.s3.amazonaws.com/hello.txt'
  };
  // parse url used in https request
  options.host = require('url').parse(options.url).host;
  options.path = require('url').parse(options.url).path;
  // init hmac signature used in https authorization header
  // use env variable $AWS_SECRET_ACCESS_KEY
  options.hmac = require('crypto').createHmac('sha1', process.env.AWS_SECRET_ACCESS_KEY);
  options.hmac.update('PUT\n\n' + options.contentType + '\n' +
    options.date + '\n' +
    '/' + process.env.AWS_S3_BUCKET + options.path);
  // init headers
  options.headers = {
    // use env variable $AWS_ACCESS_KEY_ID
    authorization: 'aws ' + process.env.AWS_ACCESS_KEY_ID + ':' + options.hmac.digest('base64'),
    'content-length': Buffer.byteLength(options.data),
    'content-type': options.contentType,
    date: options.date,
    host: options.host
  };
  // init https request
  options.request = require('https').request(options, function (response) {
    response.on('data', function (chunk) {
      // print error to stderr
      console.error(String(chunk));
    });
  });
  // PUT https data to s3
  options.request.end(options.data);
}());