Example on how to create a signed URL using Node.js for uploading a file to Google Cloud Storage

gcloud-signed-url.js

var gcloud = require('gcloud');
var uuid = require('uuid');

// Google Cloud Storage Bucket Name
const BUCKET_NAME = 'bucket-name';
// Google Developer Console project ID
const PROJECT_ID = 'project-1234';
/* Google Developer Console -> API Manager -> Credentials ->
       Add credentials -> Service account -> JSON -> Create */
const KEY_FILENAME = 'project-0d3d97832ca7.json' // relative path
const SECONDS = 1000; // seconds in milliseconds
const URL_VALID_DURATION = 30 * SECONDS;

var gcs = gcloud.storage({
  projectId: PROJECT_ID,
  keyFilename: KEY_FILENAME
});

var filename = uuid.v4(); // v4 is a random uuid
var file = gcs.bucket(BUCKET_NAME).file(filename);

file.getSignedUrl({
  // More documention on options at
  // https://googlecloudplatform.github.io/gcloud-node/#/docs/v0.24.1/storage/file?method=getSignedUrl
  action: 'write',
  expires: Date.now() * URL_VALID_DURATION
}, function (err, url) {
  if (err) {
    console.error(err);
    return;
  }
  console.log("URL");
  console.log("-----");
  console.log(url);
  console.log("-----");
  console.log("PUT to this URL to upload to Google Cloud Storage as " + filename);
});

Should that be a + on line 26 instead of a *.