google-cloud-node: Urgent: Firebase file upload not working

As showed in npm/firebase, Server side Firebase npm module is not support. Instead, you can use the gcloud Node.js client .

/////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////

var gcloud = require('gcloud');

var gcs = gcloud.storage({
  projectId: 'firebase-project',
  keyFilename: 'firebase-key.json'
});

var bucket = gcs.bucket('petertest-25efd.appspot.com');

bucket.upload('/photos/zoo/zebra.jpg', function(err, file) {
  if (!err) {
    // "zebra.jpg" is now in your bucket. 
  }
});

/////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////

This is the error:

{ [ApiError: Forbidden]
  code: 403,
  errors: [ { domain: 'global', reason: 'forbidden', message: 'Forbidden' } ],
  response: undefined,
  message: 'Forbidden' }