iTubeGo YouTube Downloader

Download YouTube videos and audios for free without external service, convert YouTube to all formats.

您需要先安装一个扩展,例如 篡改猴Greasemonkey暴力猴,之后才能安装此脚本。

您需要先安装一个扩展,例如 篡改猴暴力猴,之后才能安装此脚本。

您需要先安装一个扩展,例如 篡改猴暴力猴,之后才能安装此脚本。

您需要先安装一个扩展,例如 篡改猴Userscripts ,之后才能安装此脚本。

您需要先安装一款用户脚本管理器扩展,例如 Tampermonkey,才能安装此脚本。

您需要先安装用户脚本管理器扩展后才能安装此脚本。

(我已经安装了用户脚本管理器,让我安装!)

您需要先安装一款用户样式管理器扩展,比如 Stylus,才能安装此样式。

您需要先安装一款用户样式管理器扩展,比如 Stylus,才能安装此样式。

您需要先安装一款用户样式管理器扩展,比如 Stylus,才能安装此样式。

您需要先安装一款用户样式管理器扩展后才能安装此样式。

您需要先安装一款用户样式管理器扩展后才能安装此样式。

您需要先安装一款用户样式管理器扩展后才能安装此样式。

(我已经安装了用户样式管理器,让我安装!)

// ==UserScript==
// @name         iTubeGo YouTube Downloader
// @namespace    https://itubego.com/
// @version      1.0.1
// @date		 2020-06-04
// @description  Download YouTube videos and audios for free without external service, convert YouTube to all formats.
// @homepage	https://itubego.com/
// @icon		https://keepvid.pro/assets/images/itubego.png
// @author       iTubeGo
// @match        https://*.youtube.com/*
// @require      https://unpkg.com/[email protected]/dist/vue.js
// @require      https://unpkg.com/[email protected]/xfetch.min.js
// @require      https://bundle.run/[email protected]
// @grant        GM_xmlhttpRequest
// @connect      googlevideo.com
// @compatible   firefox >=52
// @compatible   chrome >=55
// @license 	 MIT
// ==/UserScript==

;(function() {
	'use strict'
	const DEBUG = true
	const RESTORE_ORIGINAL_TITLE_FOR_CURRENT_VIDEO = true
	const createLogger = (console, tag) =>
		Object.keys(console)
			.map(k => [
				k,
				(...args) =>
					DEBUG
						? console[k](tag + ': ' + args[0], ...args.slice(1))
						: void 0
			])
			.reduce((acc, [k, fn]) => ((acc[k] = fn), acc), {})
	const logger = createLogger(console, 'YTDL')

	const LANG_FALLBACK = 'en'
	const LOCALE = {
		en: {
			togglelinks: 'Other formats',
			stream: 'Stream',
			adaptive: 'Adaptive',
			get_video_failed:
				'You seems to have AdBlocking extension installed, which blocks %s.\nPlease add the following rule to the rule set, or it will prevent Local YouTube Downloader from working.\n\nPS: If it refuse to add that rule, you should uninstall it and use "uBlock Origin" instead.\nIf you still don\'t understand what I am saying, just disable or uninstall all your ad blockers...'
		},
		'zh-tw': {
			togglelinks: '顯示 / 隱藏連結',
			stream: '串流 Stream',
			adaptive: '自適應 Adaptive',
			get_video_failed:
				'您看起來有在使用擋廣告的擴充功能,而它將 %s 給阻擋了。\n請將下方的規則加入你的廣告阻擋器中,否則本地 YouTube 下載器無法正常運作。\n\nPS: 如它拒絕加入該規則,請將它移除並改為使用 "uBlock Origin"。\n如果你仍無法理解我在說什麼,那就直接把全部的廣告阻擋器停用或是移除掉...'
		},
		'zh-hk': {
			togglelinks: '顯示 / 隱藏連結',
			stream: '串流 Stream',
			adaptive: '自適應 Adaptive',
			get_video_failed:
				'您睇來有用阻擋廣告嘅擴充功能,而佢阻擋咗 %s。\n請將下面嘅規則加到你嘅廣告阻擋器,否則本地 YouTube 下載器唔能夠正常運作。\n\nPS: 如果佢拒絕加入呢個規則,請將佢移除並改用 "uBlock Origin"。\n如果你仍然唔明我講乜,咁就直接停用或者移除全部廣告阻擋器...'
		},
		zh: {
			togglelinks: '显示 / 隐藏链接',
			stream: '串流 Stream',
			adaptive: '自适应 Adaptive',
			get_video_failed:
				'您看起来有在使用挡广告的扩充功能,而它将 %s 给阻挡了。\n请将下方的规则加入你的广告阻挡器中,否则本地 YouTube 下载器无法正常运作。\n\nPS: 如它拒绝加入该规则,请将它移除并改为使用 "uBlock Origin"。\n如果你仍无法理解我在说什么,那就直接把全部的广告阻挡器停用或是移除掉...'
		},
		kr: {
			togglelinks: '링크 보이기/숨기기',
			stream: '스트리밍',
			adaptive: '조정 가능한',
		},
		es: {
			togglelinks: 'Mostrar/Ocultar Links',
			stream: 'Stream',
			adaptive: 'Adaptable',
		},
		he: {
			togglelinks: 'הצג/הסתר קישורים',
			stream: 'סטרים',
			adaptive: 'אדפטיבי',
		},
		ru: {
			togglelinks: 'Показать/Скрыть ссылки',
			stream: 'Stream',
			adaptive: 'Адаптивная',
			get_video_failed:
				'Похоже у вас установлено расширение AdBlock, которое блокирует %s.\nДобавьте следующее правило в исключение, иначе это помешает работе локального загрузчика YouTube.\n\nЗЫ: Если расширение отказывается добавить это правило, его следует удалить и использовать "uBlock Origin".\nЕсли вы все ещё не понимаете, о чём я говорю, просто отключите или удалите все свои блокировщики рекламы...'
		}
	}
	const findLang = l => {
		// language resolution logic: zh-tw --(if not exists)--> zh --(if not exists)--> LANG_FALLBACK(en)
		l = l.toLowerCase().replace('_', '-')
		if (l in LOCALE) return l
		else if (l.length > 2) return findLang(l.split('-')[0])
		else return LANG_FALLBACK
	}
	const $ = (s, x = document) => x.querySelector(s)
	const $el = (tag, opts) => {
		const el = document.createElement(tag)
		Object.assign(el, opts)
		return el
	}

	const escapeRegExp = s => s.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
	const parseDecsig = function a(data){try{if(data.startsWith("var script")){const obj={},document={createElement:()=>obj,head:{appendChild:()=>{}}};eval(data),data=obj.innerHTML}const fnnameresult=/=([a-zA-Z0-9\$]+?)\(decodeURIComponent/.exec(data),fnname=fnnameresult[1],_argnamefnbodyresult=new RegExp(escapeRegExp(fnname)+"=function\\((.+?)\\){(.+?)}").exec(data),[_,argname,fnbody]=_argnamefnbodyresult,helpernameresult=/;(.+?)\..+?\(/.exec(fnbody),helpername=helpernameresult[1],helperresult=new RegExp("var "+escapeRegExp(helpername)+"={[\\s\\S]+?};").exec(data),helper=helperresult[0];return logger.log("parsedecsig result: %s=>{%s\n%s}",argname,helper,fnbody),new Function([argname],helper+"\n"+fnbody)}catch(e){logger.error("parsedecsig error: %o",e),logger.info("script content: %s",data),logger.info('If you encounter this error, please copy the full "script content" to https://pastebin.com/ for me.')}}

	const parseQuery = s =>
		[...new URLSearchParams(s).entries()].reduce(
			(acc, [k, v]) => ((acc[k] = v), acc),
			{}
		)
	const getVideo = async function a(e,o){const c=await xf.get(`https://www.youtube.com/get_video_info?video_id=${e}&el=detailpage`).text().catch(e=>null);if(!c)return"Adblock conflict";const t=parseQuery(c),s=JSON.parse(t.player_response);if(logger.log("video %s data: %o",e,t),logger.log("video %s playerResponse: %o",e,s),"fail"===t.status)throw t;function a(e,o,c){return e.split(o).join(c)}let i=[];if(s.streamingData.formats){(i=s.streamingData.formats.map(e=>Object.assign({},e,parseQuery(e.cipher||e.signatureCipher)))).sort((e,o)=>e.qualityLabel>o.qualityLabel?-1:1);for(const e of i){const o=s.videoDetails.title,c=new URL(e.url);c.host="redirector.googlevideo.com",c.search+="&title="+encodeURI(o),e.url=c.href;const t=e.mimeType.split(";");e.format=t[0].split("/")[1].toUpperCase(),codecs=t[1].split("=")[1];const i=t[0].split("/")[0];"video"==i&&(e.vcodec=codecs.split(",")[0],e.acodec="none",codecs.split(",")[1]&&(e.acodec=codecs.split(",")[1])),"audio"==i&&(e.vcodec="none",e.acodec=codecs.split(",")[0]),e.vcodec=a(e.vcodec,'"',""),e.vcodec=a(e.vcodec," ",""),e.vcodec=e.vcodec.split(".")[0],e.acodec=a(e.acodec,'"',""),e.acodec=a(e.acodec," ",""),e.acodec=e.vcodec.split(".")[0]}if(logger.log("video %s stream: %o",e,i),i[0].sp&&i[0].sp.includes("sig"))for(const e of i)e.s=o(e.s),e.url+=`&sig=${e.s}`}let d=[];if(s.streamingData.adaptiveFormats){d=s.streamingData.adaptiveFormats.map(e=>Object.assign({},e,parseQuery(e.cipher||e.signatureCipher)));for(const e of d){const o=s.videoDetails.title,c=new URL(e.url);c.host="redirector.googlevideo.com",c.search+="&title="+encodeURI(o),e.url=c.href;const t=e.mimeType.split(";");e.format=t[0].split("/")[1].toUpperCase(),codecs=t[1].split("=")[1];const i=t[0].split("/")[0];"video"==i&&(e.vcodec=codecs.split(",")[0],e.acodec="none",codecs.split(",")[1]&&(e.acodec=codecs.split(",")[1])),"audio"==i&&(e.vcodec="none",e.acodec=codecs.split(",")[0],e.qualityLabel=parseInt(e.averageBitrate/1e3).toString()+"kbps"),e.vcodec=a(e.vcodec,'"',""),e.vcodec=a(e.vcodec," ",""),e.vcodec=e.vcodec.split(".")[0],e.acodec=a(e.acodec,'"',""),e.acodec=a(e.acodec," ",""),e.acodec=e.acodec.split(".")[0]}if(logger.log("video %s adaptive: %o",e,d),d[0].sp&&d[0].sp.includes("sig"))for(const e of d)e.s=o(e.s),e.url+=`&sig=${e.s}`}return logger.log("video %s result: %o",e,{stream:i,adaptive:d}),{stream:i,adaptive:d,meta:t}}

	const workerMessageHandler = async e => {
		const decsig = await xf.get(e.data.path).text(parseDecsig)
		try {
			const result = await getVideo(e.data.id, decsig)
			self.postMessage(result)
		} catch (e) {
			self.postMessage(e)
		}
	}
	const ytdlWorkerCode = `
importScripts('https://unpkg.com/[email protected]/dist/vue.js')
importScripts('https://unpkg.com/[email protected]/xfetch.min.js')
const DEBUG=${DEBUG}
const logger=(${createLogger})(console, 'YTDL')
const escapeRegExp=${escapeRegExp}
const parseQuery=${parseQuery}
const parseDecsig=${parseDecsig}
const getVideo=${getVideo}
self.onmessage=${workerMessageHandler}`
	const ytdlWorker = new Worker(
		URL.createObjectURL(new Blob([ytdlWorkerCode]))
	)
	const workerGetVideo = (id, path) => {
		logger.log(`workerGetVideo start: %s %s`, id, path)
		return new Promise((res, rej) => {
			const callback = e => {
				ytdlWorker.removeEventListener('message', callback)
				if (e.data === 'Adblock conflict') {
					return rej(e.data)
				}
				logger.log('workerGetVideo end: %o', e.data)
				res(e.data)
			}
			ytdlWorker.addEventListener('message', callback)
			ytdlWorker.postMessage({ id, path })
		})
	}

	const template = `
<div class="box" :class="{'dark':dark}">
	<div v-if="1" class="of-h t-center lh-20 button-container">
		<a class="button c-pointer" :href="stream[0].url" target="_blank">
			<svg t="1588821961308" class="icon" viewBox="0 0 1026 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="11214" width="24" height="24"><path d="M906.960201 111.639098h-187.989975a37.213033 37.213033 0 0 0-36.250627 36.250626 37.213033 37.213033 0 0 0 36.250627 36.250627h187.989975a46.516291 46.516291 0 0 1 43.949874 48.761905v668.230576a46.516291 46.516291 0 0 1-43.949874 48.761905H117.145664a46.516291 46.516291 0 0 1-43.949875-48.761905V233.223058a46.516291 46.516291 0 0 1 43.949875-48.441103h189.914787a36.571429 36.571429 0 0 0 0-72.822055H117.145664A118.37594 118.37594 0 0 0 0.052932 233.864662v668.230576a119.659148 119.659148 0 0 0 117.092732 121.904762h792.380953a119.659148 119.659148 0 0 0 117.092731-121.904762V233.223058a121.58396 121.58396 0 0 0-119.659147-121.58396z" fill="#ffffff" p-id="11215"></path><path d="M305.135639 481.203008a34.646617 34.646617 0 0 0 0 51.32832l179.969925 179.969925 2.566416 2.566416a2.566416 2.566416 0 0 1 2.566416 2.566416c2.566416 2.566416 5.132832 2.566416 7.378446 5.132832s2.566416 0 5.132832 2.566416 4.81203 2.566416 9.62406 2.566416a16.360902 16.360902 0 0 0 9.62406-2.566416c2.566416 0 2.566416 0 5.132833-2.566416s5.132832-2.566416 7.057644-5.132832a2.566416 2.566416 0 0 0 2.566416-2.566416l2.566416-2.566416 180.290727-179.969925a36.250627 36.250627 0 1 0-51.328321-51.32832l-119.017544 119.338345V36.250627a36.571429 36.571429 0 0 0-72.822055 0v563.007518L357.105564 481.203008a35.929825 35.929825 0 0 0-51.969925 0z" fill="#ffffff" p-id="11216"></path></svg>
			<span v-text="'MP4 (' + stream[0].qualityLabel + ')'"></span>
		</a>
		<a class="button c-pointer" href="https://itubego.com/youtube-downloader/?utm_source=Social&utm_medium=mp4_button&utm_campaign=Extension" target="_blank">
			<svg t="1588821961308" class="icon" viewBox="0 0 1026 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="11214" width="24" height="24"><path d="M906.960201 111.639098h-187.989975a37.213033 37.213033 0 0 0-36.250627 36.250626 37.213033 37.213033 0 0 0 36.250627 36.250627h187.989975a46.516291 46.516291 0 0 1 43.949874 48.761905v668.230576a46.516291 46.516291 0 0 1-43.949874 48.761905H117.145664a46.516291 46.516291 0 0 1-43.949875-48.761905V233.223058a46.516291 46.516291 0 0 1 43.949875-48.441103h189.914787a36.571429 36.571429 0 0 0 0-72.822055H117.145664A118.37594 118.37594 0 0 0 0.052932 233.864662v668.230576a119.659148 119.659148 0 0 0 117.092732 121.904762h792.380953a119.659148 119.659148 0 0 0 117.092731-121.904762V233.223058a121.58396 121.58396 0 0 0-119.659147-121.58396z" fill="#ffffff" p-id="11215"></path><path d="M305.135639 481.203008a34.646617 34.646617 0 0 0 0 51.32832l179.969925 179.969925 2.566416 2.566416a2.566416 2.566416 0 0 1 2.566416 2.566416c2.566416 2.566416 5.132832 2.566416 7.378446 5.132832s2.566416 0 5.132832 2.566416 4.81203 2.566416 9.62406 2.566416a16.360902 16.360902 0 0 0 9.62406-2.566416c2.566416 0 2.566416 0 5.132833-2.566416s5.132832-2.566416 7.057644-5.132832a2.566416 2.566416 0 0 0 2.566416-2.566416l2.566416-2.566416 180.290727-179.969925a36.250627 36.250627 0 1 0-51.328321-51.32832l-119.017544 119.338345V36.250627a36.571429 36.571429 0 0 0-72.822055 0v563.007518L357.105564 481.203008a35.929825 35.929825 0 0 0-51.969925 0z" fill="#ffffff" p-id="11216"></path></svg>
			<span>MP4 (HD)</span>
		</a>
		<a class="button c-pointer" href="https://itubego.com/youtube-to-mp3-downloader/?utm_source=Social&utm_medium=mp3_button&utm_campaign=Extension" target="_blank">
			<svg t="1588821961308" class="icon" viewBox="0 0 1026 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="11214" width="24" height="24"><path d="M906.960201 111.639098h-187.989975a37.213033 37.213033 0 0 0-36.250627 36.250626 37.213033 37.213033 0 0 0 36.250627 36.250627h187.989975a46.516291 46.516291 0 0 1 43.949874 48.761905v668.230576a46.516291 46.516291 0 0 1-43.949874 48.761905H117.145664a46.516291 46.516291 0 0 1-43.949875-48.761905V233.223058a46.516291 46.516291 0 0 1 43.949875-48.441103h189.914787a36.571429 36.571429 0 0 0 0-72.822055H117.145664A118.37594 118.37594 0 0 0 0.052932 233.864662v668.230576a119.659148 119.659148 0 0 0 117.092732 121.904762h792.380953a119.659148 119.659148 0 0 0 117.092731-121.904762V233.223058a121.58396 121.58396 0 0 0-119.659147-121.58396z" fill="#ffffff" p-id="11215"></path><path d="M305.135639 481.203008a34.646617 34.646617 0 0 0 0 51.32832l179.969925 179.969925 2.566416 2.566416a2.566416 2.566416 0 0 1 2.566416 2.566416c2.566416 2.566416 5.132832 2.566416 7.378446 5.132832s2.566416 0 5.132832 2.566416 4.81203 2.566416 9.62406 2.566416a16.360902 16.360902 0 0 0 9.62406-2.566416c2.566416 0 2.566416 0 5.132833-2.566416s5.132832-2.566416 7.057644-5.132832a2.566416 2.566416 0 0 0 2.566416-2.566416l2.566416-2.566416 180.290727-179.969925a36.250627 36.250627 0 1 0-51.328321-51.32832l-119.017544 119.338345V36.250627a36.571429 36.571429 0 0 0-72.822055 0v563.007518L357.105564 481.203008a35.929825 35.929825 0 0 0-51.969925 0z" fill="#ffffff" p-id="11216"></path></svg>
			<span>MP3 (320kbps)</span>
		</a>
	</div>
	<div class="t-center t-hint fs-14px">Note: Right-click the Download button if video not download, choose 'Save link as...' or 'Download link as...' option.</div>
	<div class="box-toggle div-a t-center fs-14px other-formats-btn">
		<span @click="hide=!hide" class="c-pointer">Other formats</span>
		<img src="data:image/jpeg;base64,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" />
	</div>
	<div :class="{'hide':hide}">
		<table class="other-formats-table">
			<tr>
				<th>Format</th>
				<th>Codecs</th>
				<th>Quality</th>
				<th>Download</th>
			</tr>
			<tr>
				<td>MP4</td>
				<td>video=<b>h264</b>, audio=<b>aac</b></td>
				<td>4k (iTubeGo)</td>
				<td style="color:#F59A23"><a href="https://itubego.com/youtube-downloader/?utm_source=Social&utm_medium=4k&utm_campaign=Extension" target="_blank">Install</a></td>
			</tr>
			<tr>
				<td>MP4</td>
				<td>video=<b>h264</b>, audio=<b>aac</b></td>
				<td>1080p (iTubeGo)</td>
				<td style="color:#F59A23"><a href="https://itubego.com/youtube-downloader/?utm_source=Social&utm_medium=1080p&utm_campaign=Extension" target="_blank">Install</a></td>
			</tr>
			<tr>
				<td>MP3</td>
				<td>audio=<b>mp3</b></td>
				<td>320kpbs (Musify)</td>
				<td style="color:#F59A23"><a href="https://itubego.com/youtube-to-mp3-downloader/?utm_source=Social&utm_medium=320kbps&utm_campaign=Extension" target="_blank">Install</a></td>
			</tr>
			<tr v-for="vid in stream">
				<td v-text="vid.format"></td>
				<td v-text="'video=' + vid.vcodec + ', audio=' + vid.acodec"></td>
				<td v-text="vid.qualityLabel"></td>
				<td style="color:#F59A23"><a :href="vid.url" target="_blank">Download</a></td>
			</tr>
			<tr v-for="vid in adaptive">
				<td v-text="vid.format"></td>
				<td v-text="'video=' + vid.vcodec + ', audio=' + vid.acodec"></td>
				<td v-text="vid.qualityLabel"></td>
				<td style="color:#F59A23"><a :href="vid.url" target="_blank">Download</a></td>
			</tr>
		</table>
	</div>
</div>
`.slice(1)
	const app = new Vue({
		data() {
			return {
				hide: true,
				id: '',
				stream: [],
				adaptive: [],
				meta: null,
				dark: false,
				lang: findLang(navigator.language)
			}
		},
		computed: {
			strings() {
				return LOCALE[this.lang.toLowerCase()]
			}
		},
		methods: {
		},
		template
	})
	logger.log(`default language: %s`, app.lang)

	// attach element
	const shadowHost = $el('div')
	const shadow = shadowHost.attachShadow
		? shadowHost.attachShadow({ mode: 'closed' })
		: shadowHost // no shadow dom
	logger.log('shadowHost: %o', shadowHost)
	const container = $el('div')
	shadow.appendChild(container)
	app.$mount(container)

	if (DEBUG && typeof unsafeWindow !== 'undefined') {
		// expose some functions for debugging
		unsafeWindow.$app = app
		unsafeWindow.parseQuery = parseQuery
		unsafeWindow.parseDecsig = parseDecsig
		unsafeWindow.getVideo = getVideo
	}

	const getLangCode = () => {
		if (typeof ytplayer !== 'undefined' && ytplayer.config) {
			return ytplayer.config.args.host_language
		} else if (typeof yt !== 'undefined') {
			return yt.config_.GAPI_LOCALE
		} else {
			return navigator.language
		}
		return null
	}
	const textToHtml = t => {
		// URLs starting with http://, https://
		t = t.replace(
			/(\b(https?):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/gim,
			'<a href="$1" target="_blank">$1</a>'
		)
		t = t.replace(/\n/g, '<br>')
		return t
	}
	const applyOriginalTitle = meta => {
		const data = eval(`(${meta.player_response})`).videoDetails // not a valid json, so JSON.parse won't work
		if ($('#eow-title')) {
			// legacy youtube
			$('#eow-title').textContent = data.title
			$('#eow-description').innerHTML = textToHtml(data.shortDescription)
		} else if ($('h1.title')) {
			// new youtube (polymer)
			$('h1.title').textContent = data.title
			$('yt-formatted-string.content').innerHTML = textToHtml(
				data.shortDescription
			)
		}
	}
	const load = async id => {
		try {
			const basejs =
				typeof ytplayer !== 'undefined' && ytplayer.config
					? 'https://' + location.host + ytplayer.config.assets.js
					: $('script[src$="base.js"]').src
			const data = await workerGetVideo(id, basejs)
			logger.log('video loaded: %s', id)
			if (RESTORE_ORIGINAL_TITLE_FOR_CURRENT_VIDEO) {
				try {
					applyOriginalTitle(data.meta)
				} catch (e) {
					// just make sure the main function will work even if original title applier doesn't work
				}
			}
			app.id = id
			app.stream = data.stream
			app.adaptive = data.adaptive
			app.meta = data.meta

			const actLang = getLangCode()
			if (actLang !== null) {
				const lang = findLang(actLang)
				logger.log('youtube ui lang: %s', actLang)
				logger.log('ytdl lang:', lang)
				app.lang = lang
			}
		} catch (err) {
			if (err === 'Adblock conflict') {
				const str = app.strings.get_video_failed.replace(
					'%s',
					`https://www.youtube.com/get_video_info?video_id=${id}&el=detailpage`
				)
				prompt(
					str,
					'@@||www.youtube.com/get_video_info?*=detailpage$xhr,domain=youtube.com'
				)
			}
			logger.error('load', err)
		}
	}
	let prev = null
	setInterval(() => {
		const el = $('ytd-video-primary-info-renderer>#container')
		if (el && !el.contains(shadowHost)) {
			el.insertBefore(shadowHost, el.childNodes[el.childNodes.length-1])
		}

		if (location.href !== prev) {
			logger.log(`page change: ${prev} -> ${location.href}`)
			prev = location.href
			if (location.pathname === '/watch') {
				shadowHost.style.display = 'block'
				const id = parseQuery(location.search).v
				logger.log('start loading new video: %s', id)
				app.hide = true // fold it
				load(id)
			} else {
				shadowHost.style.display = 'none'
			}
		}
	}, 1000)

	// listen to dark mode toggle
	const $html = $('html')
	new MutationObserver(() => {
		app.dark = $html.getAttribute('dark') === 'true'
	}).observe($html, { attributes: true })
	app.dark = $html.getAttribute('dark') === 'true'

	const css = `
.button-container {
	display: flex;
    justify-content: center;
}
.button-container .button {
	margin: 10px;
    font-size: 15px;
    color: black;
    display: flex;
    align-items: center;
}
.button svg {
	background: #F59A23;
    padding: 6px;
    border-top-left-radius: 3px;
    border-bottom-left-radius: 3px;
    display: inline-block;
}
.button span {
    background: white;
    border: 1px #bdbdbd solid;
    padding: 7px 8px;
    border-left: 0px;
    border-top-right-radius: 3px;
    border-bottom-right-radius: 3px;
    background-color: white;
    display: inline-block;
    width: 110px;
}
.other-formats-btn {
	display: flex;
    justify-content: center;
	align-items: center;
}
.other-formats-btn span {
	margin-right: 5px;
    color: #F59A23;
}

.t-hint {
	font-style: italic;
    margin-bottom: 5px;
    color: #666666;
}

.hide{
	display: none;
}
.t-center{
	text-align: center;
}
.d-flex{
	display: flex;
}
.f-1{
	flex: 1;
}
.fs-14px{
	font-size: 14px;
}
.of-h{
	overflow: hidden;
}
.box{
	border-bottom: 1px solid var(--yt-border-color);
	font-family: Arial;
	padding: 15px;
	margin-bottom: 10px;
}
.box-toggle{
	margin: 3px;
	user-select: none;
	-moz-user-select: -moz-none;
}

.other-formats-table {
	margin: 0px auto;
    margin-top: 15px;
    font-size: 14px;
	width: 90%;
	border-collapse: collapse;
}

td, th {
	border: 1px solid #dddddd;
	text-align: center;
	padding: 8px;
}

.ytdl-link-btn{
	display: block;
	border: 1px solid !important;
	border-radius: 3px;
	text-decoration: none !important;
	outline: 0;
	text-align: center;
	padding: 2px;
	margin: 5px;
	color: black;
}
a, .div-a{
	text-decoration: none;
	color: var(--yt-button-color, inherit);
}
.box.dark{
	color: var(--ytd-video-primary-info-renderer-title-color, var(--yt-primary-text-color));
}
.box.dark .ytdl-link-btn{
	color: var(--ytd-video-primary-info-renderer-title-color, var(--yt-primary-text-color));
}
.box.dark .ytdl-link-btn:hover{
	color: rgba(200, 200, 255, 0.8);
}
.box.dark .box-toggle:hover{
	color: rgba(200, 200, 255, 0.8);
}
.c-pointer{
	cursor: pointer;
}
.lh-20{
	line-height: 20px;
}
`
	shadow.appendChild($el('style', { textContent: css }))
})()