gistfile1.js

var listbucket = function(client, prefix, n, callback, marker) {
    var step = 100;
    if (n > 0) {
        util.debug(n + ' records to process');
        var params = {
            'max-keys': step
        };
        prefix && (params.prefix = prefix);
        marker && (params.marker = marker);

        client.get('?' + querystring.stringify(params), {
        }).on('response', function(res) {
            res.setEncoding('utf8');
            var listing = '';
            res.on('data', function(chunk) {
                listing += chunk;
            })
            .on('end', function() {
                var parser = new xml2js.Parser();
                parser.addListener('end', function(result) {
                    callback(result.Contents);
                    if (result.IsTruncated.text == 'true') {
                        listbucket(client,
                            prefix,
                            n - step,
                            callback,
                            result
                                .Contents[result.Contents.length - 1]
                                .Key.text);
                    }
                });
                parser.parseString(listing);
            });
        }).end();
    }
};