// ==UserScript==
// @name Local YouTube Downloader
// @name:zh-TW 本地 YouTube 下載器
// @name:zh-CN 本地 YouTube 下载器
// @namespace https://blog.maple3142.net/
// @version 0.9.2
// @description Get youtube raw link without external service.
// @description:zh-TW 不需要透過第三方的服務就能下載 YouTube 影片。
// @description:zh-CN 不需要透过第三方的服务就能下载 YouTube 影片。
// @author maple3142
// @match https://*.youtube.com/*
// @require https://unpkg.com/vue@2.6.10/dist/vue.js
// @require https://unpkg.com/xfetch-js@0.3.4/xfetch.min.js
// @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: 'Show/Hide Links',
stream: 'Stream',
adaptive: 'Adaptive',
videoid: 'Video Id: ',
thumbnail: 'Thumbnail',
inbrowser_adaptive_merger: 'In browser adaptive video & audio merger'
},
'zh-tw': {
togglelinks: '顯示 / 隱藏連結',
stream: '串流 Stream',
adaptive: '自適應 Adaptive',
videoid: '影片 ID: ',
thumbnail: '影片縮圖',
inbrowser_adaptive_merger: '瀏覽器版自適應影片及聲音合成器'
},
zh: {
togglelinks: '显示 / 隐藏链接',
stream: '串流 Stream',
adaptive: '自适应 Adaptive',
videoid: '视频 ID: ',
thumbnail: '视频缩图',
inbrowser_adaptive_merger: '浏览器版自适应视频及声音合成器'
},
kr: {
togglelinks: '링크 보이기/숨기기',
stream: '스트리밍',
adaptive: '조정 가능한',
videoid: 'Video Id: {{id}}'
}
}
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 parseDecsig = data => {
try {
if (data.startsWith('var script')) {
// they inject the script via script tag
const obj = {}
const document = { createElement: () => obj, head: { appendChild: () => {} } }
eval(data)
data = obj.innerHTML
}
const fnnameresult = /\.set\([^,]*,encodeURIComponent\(([^(]*)\(/.exec(data)
const fnname = fnnameresult[1]
const _argnamefnbodyresult = new RegExp(fnname + '=function\\((.+?)\\){(.+?)}').exec(data)
const [_, argname, fnbody] = _argnamefnbodyresult
const helpernameresult = /;(.+?)\..+?\(/.exec(fnbody)
const helpername = helpernameresult[1]
const helperresult = new RegExp('var ' + helpername + '={[\\s\\S]+?};').exec(data)
const helper = helperresult[0]
logger.log(`parsedecsig result: %s=>{%s\n%s}`, argname, helper, fnbody)
return 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 (id, decsig) => {
return xf
.get(`https://www.youtube.com/get_video_info?video_id=${id}&el=detailpage`)
.text()
.then(async data => {
const obj = parseQuery(data)
logger.log(`video %s data: %o`, id, obj)
if (obj.status === 'fail') {
throw obj
}
let stream = []
if (obj.url_encoded_fmt_stream_map) {
stream = obj.url_encoded_fmt_stream_map.split(',').map(parseQuery)
logger.log(`video %s stream: %o`, id, stream)
if (stream[0].sp && stream[0].sp.includes('sig')) {
stream = stream
.map(x => ({ ...x, s: decsig(x.s) }))
.map(x => ({ ...x, url: x.url + `&sig=${x.s}` }))
}
}
let adaptive = []
if (obj.adaptive_fmts) {
adaptive = obj.adaptive_fmts.split(',').map(parseQuery)
logger.log(`video %s adaptive: %o`, id, adaptive)
if (adaptive[0].sp && adaptive[0].sp.includes('sig')) {
adaptive = adaptive
.map(x => ({ ...x, s: decsig(x.s) }))
.map(x => ({ ...x, url: x.url + `&sig=${x.s}` }))
}
}
logger.log(`video %s result: %o`, id, { stream, adaptive })
return { stream, adaptive, meta: obj }
})
}
const getVideoDetails = id =>
xf
.get('https://www.googleapis.com/youtube/v3/videos', {
qs: {
key: 'AIzaSyBk6o0igFl-P4Qe4ouVlRTPlqX7kruWdUg',
part: 'snippet',
id
}
})
.json(r => r.items[0])
const getHighresThumbnail = id =>
getVideoDetails(id).then(
details =>
Object.values(details.snippet.thumbnails)
.map(d => {
const x = {}
x.url = d.url
x.size = d.width * d.height
return x
})
.sort((a, b) => b.size - a.size)[0].url
)
const workerMessageHandler = async e => {
const decsig = await xf.get(e.data.path).text(parseDecsig)
const result = await getVideo(e.data.id, decsig)
self.postMessage(result)
}
const ytdlWorkerCode = `
importScripts('https://unpkg.com/xfetch-js@0.3.4/xfetch.min.js')
const DEBUG=${DEBUG}
const logger=(${createLogger})(console, 'YTDL')
const parseQuery=${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)
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 @click="hide=!hide" class="box-toggle t-center fs-14px" v-text="strings.togglelinks"></div>
<div :class="{'hide':hide}">
<div class="t-center fs-14px" v-text="strings.videoid+id"></div>
<div class="t-center fs-14px">
<a :href="thumbnail" target="_blank" v-text="strings.thumbnail"></a>
</div>
<div class="d-flex">
<div class="f-1 of-h">
<div class="t-center fs-14px" v-text="strings.stream"></div>
<a class="ytdl-link-btn fs-14px" target="_blank" v-for="vid in stream" :href="vid.url" :title="vid.type" v-text="vid.quality||vid.type"></a>
</div>
<div class="f-1 of-h">
<div class="t-center fs-14px" v-text="strings.adaptive"></div>
<a class="ytdl-link-btn fs-14px" target="_blank" v-for="vid in adaptive" :href="vid.url" :title="vid.type" v-text="[vid.quality_label,vid.type].filter(x=>x).join(':')"></a>
</div>
</div>
<div class="of-h t-center">
<a href="https://maple3142.github.io/mergemp4/" target="_blank" v-text="strings.inbrowser_adaptive_merger"></a>
</div>
</div>
</div>
`.slice(1)
const app = new Vue({
data() {
return {
hide: true,
id: '',
stream: [],
adaptive: [],
dark: false,
thumbnail: null,
lang: findLang(navigator.language)
}
},
computed: {
strings() {
return LOCALE[this.lang.toLowerCase()]
}
},
watch: {
async hide() {
if (this.thumbnail == null) {
app.thumbnail = await getHighresThumbnail(this.id)
}
}
},
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') {
return ytplayer.config.args.host_language
} else if (typeof yt !== 'undefined') {
return yt.config_.GAPI_LOCALE
}
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 => {
const scriptel = $('script[src$="base.js"]')
try {
const data = await workerGetVideo(id, scriptel.src)
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
// lazy load thumbnail to save quota, so it will only load thumbnail when expanding
// app.thumbnail = await getHighresThumbnail(id)
app.thumbnail = null
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) {
logger.error('load', err)
}
}
let prev = null
setInterval(() => {
const el =
$('#info-contents') ||
$('#watch-header') ||
$('.page-container:not([hidden]) ytm-item-section-renderer>lazy-list')
if (el && !el.contains(shadowHost)) {
el.appendChild(shadowHost)
}
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 = $html.getAttribute('dark') === 'true'
const css = `
.hide{
display: none;
}
.t-center{
text-align: center;
}
.d-flex{
display: flex;
}
.f-1{
flex: 1;
}
.fs-14px{
font-size: 14px;
}
.of-h{
overflow: hidden;
}
.box{
border-bottom: 1px solid var(--yt-border-color);
font-family: Arial;
}
.box-toggle{
margin: 3px;
user-select: none;
-moz-user-select: -moz-none;
}
.box-toggle:hover{
color: blue;
}
.ytdl-link-btn{
display: block;
border: 1px solid !important;
border-radius: 3px;
text-decoration: none !important;
outline: 0;
text-align: center;
padding: 2px;
margin: 5px;
color: black;
}
a.ytdl-link-btn{
text-decoration: none;
}
a.ytdl-link-btn:hover{
color: blue;
}
.box.dark{
color: var(--ytd-video-primary-info-renderer-title-color, var(--yt-primary-text-color));
}
.box.dark .ytdl-link-btn{
color: var(--ytd-video-primary-info-renderer-title-color, var(--yt-primary-text-color));
}
.box.dark .ytdl-link-btn:hover{
color: rgba(200, 200, 255, 0.8);
}
.box.dark .box-toggle:hover{
color: rgba(200, 200, 255, 0.8);
}
`
shadow.appendChild($el('style', { textContent: css }))
})()