Is there a way to upload to S3 from a url using node.js?

So you know about know, but you didn't read far enough down the README file to see that they have this exact example there?

http.get('http://google.com/doodle.png', function(res){
  var headers = {
      'Content-Length': res.headers['content-length']
    , 'Content-Type': res.headers['content-type']
  };
  client.putStream(res, '/doodle.png', headers, function(err, res){
    // Logic
  });
});

I’m not using knox but the official AWS SDK for JavaScript in Node.js. I issue a request to a URL with {encoding: null} in order to retrieve the data in buffer which can be passed directly to the Body parameter for s3.putObject(). Here below is an example of putting a remote image in a bucket with aws-sdk and request.

var AWS = require('aws-sdk');
var request = require('request');

AWS.config.loadFromPath('./config.json');
var s3 = new AWS.S3();

function put_from_url(url, bucket, key, callback) {
    request({
        url: url,
        encoding: null
    }, function(err, res, body) {
        if (err)
            return callback(err, res);

        s3.putObject({
            Bucket: bucket,
            Key: key,
            ContentType: res.headers['content-type'],
            ContentLength: res.headers['content-length'],
            Body: body // buffer
        }, callback);
    })
}

put_from_url('http://a0.awsstatic.com/main/images/logos/aws_logo.png', 'your_bucket', 'media/aws_logo.png', function(err, res) {
    if (err)
        throw err;

    console.log('Uploaded data successfully!');
});