easy access control

easyAccessControl.user.js

// ==UserScript==
// @name          Easy Access Control
// @author        Robert Lemon
// @version       1.0
// @namespace     
// @description   Adds an access control button to the chat.
// @include 	  http://chat.stackoverflow.com/rooms/*/*
// ==/UserScript==
function exec(fn) {
	var script = document.createElement('script');
	script.setAttribute("type", "application/javascript");
	script.textContent = '(' + fn + ')();';
	document.body.appendChild(script); // run the script
}
// script injection
exec(function () {
	var roomId = Number(/\d+/.exec(location)[0]);
	$.ajax({
		url: '/rooms/' + roomId,
		success: function (page) {
			var access = $(page).find('.sprite-sec-gallery').length;
			var btn = $('<a href="#"></a>');
			btn.text(access ? 'unlock' : 'lock');
			btn.on('click', function () {
				$.post('/rooms/save', {
					roomId: roomId,
					defaultAccess: access ? 'read-write' : 'read-only',
					fkey: fkey().fkey
				});
				return false;
			});
			$('<span> | </span>').add(btn).appendTo($('#sidebar-menu'));
		},
		error: function () {
			console.log('access control plugin failed to load');
		}
	});
});