var CloudStorage = require('cloud-storage');
var storage = new CloudStorage({
    accessId: '[email protected]',
    privateKey: '/path/to/private/key.pem'
});

// copy a local file or a url
storage.copy('/path/to/something.jpg', 'gs://some-bucket/something.jpg', function(err, url) {
    // public url for your file
    console.log(url);
});

storage.remove('gs://some-bucket/something.jpg', function(err, success) {
    console.log(success);
});

// if you want to get crazy you can pass in options and metadata
var options = {
    headers: {
        'Cache-Control': 'public, max-age=7200, no-transform',
        'X-Goog-Acl': 'bucket-owner-full-control'
    },
    metadata: {
        'width': 100,
        'height': 100
    },

    // remove the original file on disk after it is copied
    removeAfterCopy: true,

    // force an extension to be added to the destination
    forceExtension: true
};

storage.copy('http://someurl.com/path/to/file.jpg', 'gs://some-bucket/images/file', options, function(err, url) {

});

var url = storage.getUrl('gs://some-bucket/images/file.jpg')

// expiration time in seconds
var options = {
    expiration: 100,
    download: true
};

var signedUrl = storage.getSignedUrl('gs://some-bucket/images/file.jpg', options)