JS image upload with progress bar (not multipart/form)

no_multipart.js

var file = $('#filesToUpload').get(0).files[0];
if (!file) {
	alert('no file');
	return;
};

var o = {};
o.category = cat;
o.name = 'some file';

if (!o.name) {
	alert('no filename');
	return;
};

var reader = new FileReader(); 
reader.onload = function(evt) {
	o.file = evt.srcElement.result;
	sendFileToServer(o);
};
reader.readAsBinaryString(file);

function sendFileToServer(options) {
	var requestObject = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject("Microsoft.XMLHTTP");
	makeRequestWithHeaders(requestObject, '/api/upload', 'POST', options);
	var progCounter = 0;
	requestObject.onreadystatechange = function() {
		if (requestObject.readyState === 2) {
			setTimeout(function() {
				progCounter = 25;
			}, 600);
		} else if (requestObject.readyState === 3) {
			setTimeout(function() {
				progCounter = 50;
			}, 600);
		} else if (requestObject.readyState === 4) {
			setTimeout(function() {
				progCounter = 100;
			}, 600);
			if (requestObject.status === 200) {
				var data = JSON.parse(requestObject.responseText);
				data.direction = 'marketing';
				appendNewItem(data);
			} else {
				generateErrModal('network error, please check connection. you will now be logged out.', function() {
					callback(true);
				});
			};
		};
	};
	var foo0 = setInterval(function() {
		var _progC = progCounter * 5.2;
		$('#oprog').attr('aria-valuenow', _progC).width(_progC);
		$('#oprog').text(progCounter + '%');
		if (progCounter >= 100) finishFoo0();
		if (progCounter >= 25 && requestObject.readyState !== 2 && requestObject.readyState !== 3 && requestObject.readyState !== 4) return;
		progCounter += Math.floor(Math.random() * 5) + 1  
	}, 100);

	function finishFoo0() {
		clearInterval(foo0);
	}
};

s3_delete.js

exports.s3Delete = function(req, res) {
    var document = req.body;
    var items = req.user.items[document.category];
    items.forEach(function(i, idx) {
        if (i.image === document.id) {
            client.deleteFile(i.image, function(err, response){
                if (err) return res.send(400, 'could not delete item, please try again later');
                items.splice(i, 1);
                req.user.markModified('items');
                req.user.save(function(err) {
                    if (err) return res.send(400, 'could not delete item, please try again later');
                    res.send(200);
                });
                return;
            });
        };
    });
}

s3_upload.js

var knox = require('knox');
var client = knox.createClient({...});
s3Upload = function(req, res) {
    var document = req.body;
    var headers = {
        'Content-Length': req.body.image.length, 
        'Content-Type': "image/*"
    };
    var mime = document.image.indexOf('PNG') > -1 ? '.png' : '.jpg';
    var name = document.name + mime;
    client.putBuffer(new Buffer(document.image, 'binary'), name, headers, function(err, response){
        if (err) return res.send(400, 'error uploading image, please try again later');
        res.send(200);
    }); 
}