YouTube RSS Feed

Adds an RSS feed button to Youtube channels next to the subscribe button
Versão de: 20/07/2014. Veja: a última versão.
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// ==UserScript==
// @name          YouTube RSS Feed
// @namespace     http://greasyfork.org/users/2240-doodles
// @author        Doodles
// @version       10
// @description   Adds an RSS feed button to Youtube channels next to the subscribe button
// @icon          http://i.imgur.com/Ty5HNbT.png
// @icon64        http://i.imgur.com/1FfVvNr.png
// @include       *://*youtube.*/user/*
// @include       *://*youtube.*/channel/*
// @include       *://*youtube.*/watch*v=*
// @grant         none
// @updateVersion 10
// ==/UserScript==

if(document.URL.indexOf("/user/") != -1 || document.URL.indexOf("/channel/") != -1)
{
	var rss = chanGetLink();
	if(rss != "//") 
	{
		var button = chanCreateButton(rss);
		var success = chanPlaceButton(button);
		if(document.URL.indexOf("RSSSubscribe=now") != -1)
		{
			document.body.innerHTML = "<div align='center'><br><br>This page is where the RSS Feed is auto-opened " + 
			"from.<br>Just close this page.<br><br><a href='" + document.URL.replace("?RSSSubscribe=now","") + 
			"'>The channel</a> - <a href='"+rss+"'>The RSS Link</a></div>";
			window.location.assign(rss);
		}
	}
}
else if(document.URL.indexOf("/watch") != -1 && document.URL.indexOf("v=") != -1)
{
	var chanLink = vidGetLink();
	if(chanLink != "//")
	{
		var button = vidCreateButton(chanLink);
		var success = vidPlaceButton(button);
	}
}

//
// METHODS
//

function chanGetLink() {
	var links = document.getElementsByTagName("link");
	for (var i = 0; i < links.length; i++) 
	{
		var type = links[i].getAttribute("title");
		if (type == "RSS")
		{
			return links[i].getAttribute("href");
		}
	}
	return "//";
}

function chanCreateButton(rssLink) {
	//
	var button = document.createElement('button');
	button.setAttribute('class', 'yt-subscription-button yt-subscription-button-js-default yt-uix-button yt-uix-button-subscribe-branded');
	button.setAttribute('data-tooltip-text', 'Subscribe by RSS Feed');
	button.setAttribute('onclick', "parent.location='" + rssLink + "'");
	button.setAttribute('type', 'button');
	button.setAttribute('role', 'button');
	//
	var outerSpan = document.createElement('span');
	outerSpan.setAttribute('class', 'yt-uix-button-content');
	//
	var innerSpan = document.createElement('span');
	innerSpan.setAttribute('class', 'subscribe-hh-label');
	innerSpan.appendChild(document.createTextNode('RSS Subscribe '));
	//
	button.appendChild(outerSpan);
	outerSpan.appendChild(innerSpan);
	//
	return button;
}

function chanPlaceButton(button) {
	var header = document.getElementById('c4-primary-header-contents');
	if(header != null)
	{
		var divs = header.getElementsByTagName('span');	
		for(var i = 0; i < divs.length;i++)
		{
			var cl = divs.item(i).getAttribute('class');
			if(cl.indexOf("channel-header-subscription-button-container") != -1)
			{
				var firstButton = divs.item(i).getElementsByTagName('button')[0];
				divs.item(i).insertBefore(button, firstButton);
				var spacer = document.createTextNode(" ");
				divs.item(i).insertBefore(spacer, firstButton);
			}
		}
	}
}

function vidGetLink() {
	var header = document.getElementById('watch7-user-header');
	if(header != null)
	{
		var channelLink = "//";
		var divs = header.getElementsByTagName('a');	
		for(var i = 0; i < divs.length;i++)
		{
			var cl = divs.item(i).getAttribute('class');
			if(cl.indexOf("yt-user-name") != -1)
			{
				var hrefPart = divs.item(i).getAttribute('href');
				var startPart = document.URL.split("/watch")[0];
				channelLink = startPart + hrefPart;
				break;
			}
		}
		return channelLink;
	}
}

function vidCreateButton(chanLink) {
	//
	var button = document.createElement('button');
	button.setAttribute('class', 'yt-subscription-button yt-subscription-button-js-default yt-uix-button yt-uix-button-subscribe-branded');
	button.setAttribute('onclick', "window.open('" + chanLink + "?RSSSubscribe=now" + "','_blank');");
	button.setAttribute('type', 'button');
	button.setAttribute('role', 'button');
	//
	var outerSpan = document.createElement('span');
	outerSpan.setAttribute('class', 'yt-uix-button-content');
	//
	var innerSpan = document.createElement('span');
	innerSpan.setAttribute('class', 'subscribe-hh-label');
	innerSpan.appendChild(document.createTextNode('RSS Subscribe '));
	//
	button.appendChild(outerSpan);
	outerSpan.appendChild(innerSpan);
	//
	return button;
}

function vidPlaceButton(button) {
	var header = document.getElementById('watch7-subscription-container');
	if(header != null)
	{
		var properSpan = header.getElementsByTagName('span')[0];
		properSpan.insertBefore(document.createTextNode(" "), properSpan.firstChild);
		properSpan.insertBefore(button, properSpan.firstChild);
	}
}