// ==UserScript==
// @name        YouTube RSS Feed
// @namespace   https://greasyfork.org/en/users/4612-gdorn
// @author      GDorn
// @version     1
// @description Adds an RSS feed button to YouTube channels next to the subscribe button.  Continuation of script by Doodles: https://greasyfork.org/en/scripts/1760-youtube-rss-feed
// @icon        http://i.imgur.com/Ty5HNbT.png
// @icon64      http://i.imgur.com/1FfVvNr.png
// @match       *://www.youtube.com/*
// @match       *://youtube.com/*
// @run-at      document-end
// @grant       none
// @require      https://code.jquery.com/jquery-3.3.1.min.js
// ==/UserScript==
$(function () {
"use strict";
$(document).ready(addRssFeedSupport);
document.body.addEventListener("iron-a11y-announcer", function (event) {
addRssFeedSupport(false);
});
document.body.addEventListener("meta-contents", function(event) {
addRssFeedSupport(true);
});
});
function addRssFeedSupport(firstLoad) {
console.log("Adding RSS Feed Support");
if (isPlaylistPage()) {
console.log("Playlist Page");
waitForElement("meta-contents", function () {
var playlistFeedLink = getPlaylistFeed(getPlaylistId());
console.log("RSS link:", playlistFeedLink);
addRssLink(playlistFeedLink);
addRssButtonPlaylist(playlistFeedLink);
}, 330);
} else if (isVideoPage()) {
console.log("Video Page");
waitForElement(getChannelIdFromVideoPage, function () {
var channelId = getChannelIdFromVideoPage();
console.log("Channel ID:", channelId);
removeRssLink();
addRssLink(channelId);
addRssButton(channelId);
}, 330);
} else if (isChannelPage()) {
console.log("Channel Page");
waitForElement("subscribe-button", function () {
var channelId = getChannelIdFromChannelPage(firstLoad);
if (channelId === false) {
removeRssLink();
addRefreshButton();
} else {
var channelFeedLink = getChannelFeed(channelId);
removeRssLink();
addRssLink(channelId);
addRssButton(channelId);
}
}, 330);
}
}
function isPlaylistPage() {
return document.URL.indexOf("/playlist?list=") !== -1;
}
function isVideoPage() {
return document.URL.indexOf("/watch") !== -1 && document.URL.indexOf("v=") !== -1;
}
function isChannelPage() {
return $("#channel-header").length > 0;
}
function getPlaylistId() {
var playlistId = document.URL.split("list=")[1].split("&")[0];
if (!playlistId.startsWith("PL")) {
playlistId = "PL" + playlistId;
}
return playlistId;
}
function getChannelIdFromVideoPage() {
/**
* Update #meta-contents to point to whatever unique-looking element contains a link to the creator's channel page.  Can be an outer container.
**/
var links = $("#meta-contents").find("a");
console.log("Possible links to channel:", links);
for (var i = 0; i < links.length; i++){
var href = links[i].href;
if (href.indexOf('/channel/') !== -1){
return href.split('/channel/')[1];
}
}
return False;
}
function getChannelIdFromChannelPage(firstLoad) {
if (document.URL.indexOf("/channel/") !== -1) {
return document.URL.split("/channel/")[1].split("/")[0].split("?")[0];
} else if (firstLoad) {
return $("meta[property='og:url']").attr("content").split("/channel/")[1];
} else {
return false;
}
}
function getChannelFeed(channelId) {
return "http://www.youtube.com/feeds/videos.xml?channel_id=" + channelId;
}
function getPlaylistFeed(playlistId) {
return "http://www.youtube.com/feeds/videos.xml?playlist_id=" + playlistId;
}
function addRssLink(channelId) {
var link = getChannelFeed(channelId);
$("head").append('<link rel="alternate" type="application/rss+xml" title="RSS" href="' +
link + '" />');
}
function removeRssLink() {
if ($("link[type='application/rss+xml']").length > 0) {
$("link[type='application/rss+xml']").remove();
}
}
function waitForElement(finderFunction, callbackFunction, intervalLength = 330) {
var waitCount = 15000 / intervalLength; // wait 15 seconds maximum
var wait = setInterval(function () {
waitCount--;
if (finderFunction) {
callbackFunction();
clearInterval(wait);
} else if (waitCount <= 0) {
console.log("Never found anything with finder function");
clearInterval(wait);
} else {
console.log("Element not (yet) found");
}
}, intervalLength);
}
function addRssButton(channelId) {
var link = getChannelFeed(channelId);
if ($("#rssSubButton").length > 0) {
$("#rssSubButton").remove();
}
var selector = "a[href*='/channel/" + channelId + "']";
console.log("Selector to find targets:", selector);
var targets = $(selector);
console.log("Targets for adding RSS button:", targets);
targets.prepend(makeRssButton(link));
}
function addRssButtonPlaylist(link) {
if ($("#rssSubButton").length === 0) {
$("#owner-container > #button")
.css({
"display": "flex",
"flex-flow": "nowrap",
"height": "37px"
})
.prepend(makeRssButton(link));
}
}
function makeRssButton(link) {
return $("<a>RSS</a>")
.attr("id", "rssSubButton")
.attr("target", "_blank")
.attr("href", link)
.attr("class", 'ytd-channel-name')
.css({'padding-right': '10px'})
.css({'padding-left': '10px'});
//            .css({
//                "background-color": "#fd9b12",
//                "border-radius": "3px",
//                "padding": "10px 16px",
//                "color": "#ffffff",
//                "font-size": "14px",
//                "text-decoration": "none",
//                "text-transform": "uppercase",
//                "margin-right": "5px"
//            }
//    );  // those lines for debugging
}
function addRefreshButton() {
var refreshButton = $("<a>Refresh</a>")
.attr("id", "rssSubButton")
.attr("href", "#")
.css({
"background-color": "#fd9b12",
"border-radius": "3px",
"padding": "10px 16px",
"color": "#ffffff",
"font-size": "14px",
"text-decoration": "none",
"text-transform": "uppercase",
"margin-right": "5px"
});
$(refreshButton).click(function (e) {
e.preventDefault();
var r = confirm("Due to how YouTube load pages, there isn't a reliable way to get channel" +
" IDs from channel pages if you've navigated to them from another YouTube page." +
" The solution is to reload the page.\n\nWould you like to reload the page?");
if (r === true) {
window.location.reload();
}
});
if ($("#rssSubButton").length > 0) {
$("#rssSubButton").remove();
}
$("#subscribe-button")
.css({
"display": "flex",
"flex-flow": "nowrap",
"height": "37px"
})
.prepend(refreshButton);
}