function addItem(url) {
	getFileSize(url, insertRow);
}

async function getFileSize(url, myCallback) {
	// needs proper cors config
    var http = new XMLHttpRequest();
    http.open('HEAD', url, true); // true = Asynchronous
    http.onreadystatechange = function() {
        if (this.readyState == this.DONE) {
            if (this.status === 200) {
               myCallback(url,parseInt(this.getResponseHeader('content-length')));
            }
        }
    };
    http.send();
}

function insertRow(url, size) {
	let table = document.getElementById("table");
	var newRow = table.insertRow(table.length);

	let suffixes = ["B", "KB", "MB", "GB", "TB"];
	var sindex = 0;
	while(size > 1024) {
		sindex+=1;
		size/=1024;
	}

	newRow.insertCell(0).innerHTML = "<a href="+url+" download>"+url.split("/").pop()+"</a>";
	newRow.insertCell(1).innerHTML = pRound(size) + " " + suffixes[sindex];
}

function pRound(num) {
	// pretty round
	mult = Math.ceil(Math.pow(10,3-String(num).split(".",1)[0].length));
	return Math.round(num*mult)/mult;
}

// thoughts and prayers for everyone working in javascript