uploader-extension/uploader.js

var maxDim = 1280;

function copyToClipboard(str) {
	var el = document.createElement('textarea');
	el.value = str;
	el.setAttribute('readonly', '');
	el.style.position = 'absolute';
	el.style.left = '-9999px';
	document.body.appendChild(el);
	el.select();
	document.execCommand('copy');
	document.body.removeChild(el);
}

var http = new XMLHttpRequest();
http.open("GET", "https://snap.as/api/me", true);
http.onreadystatechange = function() {
	if (http.readyState == 4) {
		env = JSON.parse(http.responseText);
		if (env.code == 200 && typeof env.data !== 'undefined' && env.data != "") {
			document.getElementById('loading').style.display = 'none';
			document.getElementById('uploader').style.display = 'block';
		} else {
			document.getElementById('loading').innerHTML = '<a href="https://snap.as/login" id="login">Log in to Snap.as</a>';
			document.getElementById('login').onclick = function(e) {
				e.preventDefault();
				chrome.tabs.create({ url: 'https://snap.as/login' });
				window.close();
			};
		}
	}
}
http.send();

Dropzone.options.uploader = {
    maxFilesize: 16,
    resizeWidth: maxDim,
    acceptedFiles: 'image/*',
    parallelUploads: 1,
	uploadMultiple: false,
	dictDefaultMessage: 'Drop a file here',
	init: function() {
		this.on("success", function(file, resp) {
			var data = resp;
			copyToClipboard('![](' + data.data.url + ')');
			chrome.runtime.sendMessage({success: true}, function(response) { });
			window.close();
		});
	}
};