// ==UserScript==
// @name        Youtube Age Confirmation Bypass
// @namespace   kneels
// @description Prevents you from having to sign in to view age restricted videos on YouTube
// @include     https://www.youtube.*/watch*
// @include     http://*.youtube.*/watch*
// @include     https://*.youtube.*/watch*
// @match       http://*.youtube.com/watch*
// @match       https://*.youtube.com/watch*
// @version     1.5
// @grant       none
// @downloadURL none
// ==/UserScript==

var quality = 720;	// Change this to the default quality of your preference

var currentUrl = decodeURIComponent(window.location.href);

if(currentUrl.indexOf("verify_age") != -1) 
{	
	// Redirect to the regular video page
	window.location = "https://www.youtube.com/watch?v=" + getVideoID(currentUrl);
} 
else 
{   
	var el = document.getElementById('unavailable-submessage');
   
	if (el.childNodes.length > 1) 
	{
	    var embedString = "<iframe width=\"100%\" height=\"100%\" src='" + 
		       getEmbedUrl(getVideoID(currentUrl)) + "?autoplay=1&vq=hd" + 
		       quality + "' frameborder=\"0\" allowfullscreen></iframe>";
	    
		document.getElementById('player-unavailable').innerHTML = embedString;   
	}	
}

function getEmbedUrl(videoID) 
{    
    return "https://www.youtube.com/embed/" + videoID;
}

function getVideoID(url) 
{ 
	url = url.substr(url.indexOf("v=") + 2);
	var junk = url.indexOf("&");
    if(junk != -1) {
       url = url.substr(0, junk);        
    }
    return url;
}