mkwsnyder/youtube-rss-feed.js

## youtube-rss-feed.js
// @ts-nocheck

/**
 * Build an RSS Feed from your YouTube Subscriptions
 *
 * It runs a little slow to prevent YouTube from blocking the requests.
 * The entire process will take as many seconds as you have subscriptions (you can shorten this by changing the delay in getRssFeeds()).
 *
 * How to use:
 * 1. Go to https://www.youtube.com/ (while signed in
 * 2. Under Subscriptions click "Show more"
 * 3. Open the console (F12)
 * 4. Paste this script and run it
 * 5. A file named "youtube-feed.opml" will be downloaded
 */

async function buildRssFeed() {
  let channels = getChannelList();

  await getRssFeeds(channels);

  let rss = channelsToRssFeed(channels);

  writeRssToFile(rss);
}

function getChannelList() {
  let channels = [];

  for (let e of Array.from(
    document.querySelectorAll('.yt-simple-endpoint.style-scope.ytd-guide-entry-renderer'),
  ).filter((e) => e.href.includes('@'))) {
    channels.push({
      title: e.title,
      htmlUrl: e.href,
      htmlUrlImg: e.querySelector('img').src,
    });
  }

  return channels;
}

async function getRssFeeds(channels) {
  const delay = 1000;
  let index = 0;

  const processNextChannel = () => {
    if (index < channels.length) {
      return getFeed(channels[index++])
        .then(() => {
          return new Promise((resolve) => setTimeout(resolve, delay));
        })
        .then(processNextChannel);
    } else return Promise.resolve();
  };

  return processNextChannel();
}

async function getFeed(channel) {
  return fetch(channel.htmlUrl).then(async (response) => {
    let html = await response.text();
    let parser = new DOMParser();
    let doc = parser.parseFromString(html, 'text/html');

    for (let arrScripts = doc.getElementsByTagName('script'), i = 0; i < arrScripts.length; i++) {
      if (arrScripts[i].textContent.indexOf('externalId') != -1) {
        let channelId = arrScripts[i].textContent.match(/\"externalId\"\s*\:\s*\"(.*?)\"/)[1];
        let channelRss = 'https://www.youtube.com/feeds/videos.xml?channel_id=' + channelId;
        let channelTitle = doc.title.match(/\(?\d*\)?\s?(.*?)\s\-\sYouTube/)[1];
        console.log(`Acquired RSS feed for '${channelTitle}' (\n${channelRss})`);
        channel.xmlUrl = channelRss;
        break;
      }
    }
  });
}

function channelsToRssFeed(channels) {
  return `<?xml version="1.0" encoding="UTF-8"?>
<opml version="1.0">
  <head>
    <title>Script Export</title>
  </head>
  <body>
${channels.map(channelToString).join('\n')}
  </body>
</opml>`;
}

function channelToString(channel) {
  return `    <outline text="${channel.title}" type="rss" xmlUrl="${channel.xmlUrl}" htmlUrl="${channel.htmlUrl}" htmlUrlImg="${channel.htmlUrlImg}" />`;
}

function writeRssToFile(rss) {
  const blob = new Blob([rss], { type: 'text/plain;charset=utf-8' });
  const link = document.createElement('a');

  link.download = 'youtube-feed.opml';
  link.href = URL.createObjectURL(blob);

  document.body.appendChild(link);
  link.click();
  document.body.removeChild(link);
}

buildRssFeed();
	// @ts-nocheck

	/**
	* Build an RSS Feed from your YouTube Subscriptions
	*
	* It runs a little slow to prevent YouTube from blocking the requests.
	* The entire process will take as many seconds as you have subscriptions (you can shorten this by changing the delay in getRssFeeds()).
	*
	* How to use:
	* 1. Go to https://www.youtube.com/ (while signed in
	* 2. Under Subscriptions click "Show more"
	* 3. Open the console (F12)
	* 4. Paste this script and run it
	* 5. A file named "youtube-feed.opml" will be downloaded
	*/

	async function buildRssFeed() {
	let channels = getChannelList();

	await getRssFeeds(channels);

	let rss = channelsToRssFeed(channels);

	writeRssToFile(rss);
	}

	function getChannelList() {
	let channels = [];

	for (let e of Array.from(
	document.querySelectorAll('.yt-simple-endpoint.style-scope.ytd-guide-entry-renderer'),
	).filter((e) => e.href.includes('@'))) {
	channels.push({
	title: e.title,
	htmlUrl: e.href,
	htmlUrlImg: e.querySelector('img').src,
	});
	}

	return channels;
	}

	async function getRssFeeds(channels) {
	const delay = 1000;
	let index = 0;

	const processNextChannel = () => {
	if (index < channels.length) {
	return getFeed(channels[index++])
	.then(() => {
	return new Promise((resolve) => setTimeout(resolve, delay));
	})
	.then(processNextChannel);
	} else return Promise.resolve();
	};

	return processNextChannel();
	}

	async function getFeed(channel) {
	return fetch(channel.htmlUrl).then(async (response) => {
	let html = await response.text();
	let parser = new DOMParser();
	let doc = parser.parseFromString(html, 'text/html');

	for (let arrScripts = doc.getElementsByTagName('script'), i = 0; i < arrScripts.length; i++) {
	if (arrScripts[i].textContent.indexOf('externalId') != -1) {
	let channelId = arrScripts[i].textContent.match(/\"externalId\"\s\:\s\"(.*?)\"/)[1];
	let channelRss = 'https://www.youtube.com/feeds/videos.xml?channel_id=' + channelId;
	let channelTitle = doc.title.match(/\(?\d\)?\s?(.?)\s\-\sYouTube/)[1];
	console.log(`Acquired RSS feed for '${channelTitle}' (\n${channelRss})`);
	channel.xmlUrl = channelRss;
	break;
	}
	}
	});
	}

	function channelsToRssFeed(channels) {
	return `<?xml version="1.0" encoding="UTF-8"?>
	<opml version="1.0">
	<head>
	<title>Script Export</title>
	</head>
	<body>
	${channels.map(channelToString).join('\n')}
	</body>
	</opml>`;
	}

	function channelToString(channel) {
	return ` <outline text="${channel.title}" type="rss" xmlUrl="${channel.xmlUrl}" htmlUrl="${channel.htmlUrl}" htmlUrlImg="${channel.htmlUrlImg}" />`;
	}

	function writeRssToFile(rss) {
	const blob = new Blob([rss], { type: 'text/plain;charset=utf-8' });
	const link = document.createElement('a');

	link.download = 'youtube-feed.opml';
	link.href = URL.createObjectURL(blob);

	document.body.appendChild(link);
	link.click();
	document.body.removeChild(link);
	}

	buildRssFeed();