REST API Upload to S3 in Titanium

gistfile1.js

function upload(name, file, callback) {	
	Ti.include('lib/sha-aws.js'); 	// file comes from this URL's project: http://aws.amazon.com/code/Amazon-S3/3236824658053653
	Ti.include('lib/webtoolkit.utf8.js'); 		// code for this file from this URL: http://www.webtoolkit.info/javascript-utf8.html
	Ti.include('lib/date.js'); 		// file comes from this URL: http://www.mattkruse.com/javascript/date/source.html
	
	var AWSAccessKeyID = appGlobal.config.s3AccessKey;
	var AWSSecretAccessKey = appGlobal.config.s3SecretKey;

	var AWSBucketName = appGlobal.config.s3BucketName;
	var AWSHost = appGlobal.config.s3Host;
	
	var currentDateTime = formatDate(new Date(),'E, d MMM yyyy HH:mm:ss') + ' -0600';
	
	var xhr = Ti.Network.createHTTPClient();
	
	xhr.onerror = function(e) {
		var errorDetails = e.error + '\n';
		errorDetails += xhr.responseText;
		Ti.API.info(errorDetails);
	};
	
	xhr.onload = function() {
	    Ti.API.info('got my response, http status code ' + this.status);
	    callback.call();
	};
	
	//ensure we have time to upload
 	xhr.setTimeout(99000);
	
	// true or false if it's asynchronous or not (last parameter below for xhr.open)
	xhr.open('PUT', 'http://' + AWSHost + '/' + AWSBucketName + '/' + name, false);

	var StringToSign = 'PUT\n\n\n' + currentDateTime + '\nx-amz-acl:public-read\n/'+AWSBucketName+'/' + name;

	var AWSSignature = b64_hmac_sha1(AWSSecretAccessKey, Utf8.encode(StringToSign));
	var AuthorizationHeader = 'AWS ' + AWSAccessKeyID + ':' + AWSSignature;
	
	xhr.setRequestHeader('Authorization', AuthorizationHeader);
	xhr.setRequestHeader('X-Amz-Acl', 'public-read');
	xhr.setRequestHeader('Host', AWSHost);
	xhr.setRequestHeader('Date', currentDateTime);

	xhr.send(file);
}