// ==UserScript==
// @name 本地 YouTube 下载器
// @name:zh-TW 本地 YouTube 下載器
// @name:zh-CN 本地 YouTube 下载器
// @namespace www.youhou8.com
// @version 0.9.20
// @description 一个可以直接下载YouTube视频的脚本。无需借助第三方工具，直接使用浏览器下载YouTube视频.
// @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
// @require https://unpkg.com/@ffmpeg/ffmpeg@0.6.1/dist/ffmpeg.min.js
// @require https://bundle.run/p-queue@6.3.0
// @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 sleep = ms => new Promise(res => setTimeout(res, ms))
const LANG_FALLBACK = 'en'
const LOCALE = {
en: {
togglelinks: 'Show/Hide Links',
stream: 'Stream',
adaptive: 'Adaptive',
videoid: 'Video Id: ',
inbrowser_adaptive_merger:
'In browser adaptive video & audio merger (FFmpeg)',
dlmp4: 'Download highest resolution mp4 in one click'
},
'zh-tw': {
togglelinks: '顯示 / 隱藏連結',
stream: '串流 Stream',
adaptive: '自適應 Adaptive',
videoid: '影片 ID: ',
inbrowser_adaptive_merger:
'瀏覽器版自適應影片及聲音合成器 (FFmpeg)',
dlmp4: '一鍵下載高畫質 mp4'
},
zh: {
togglelinks: '显示 / 隐藏链接',
stream: '串流 Stream',
adaptive: '自适应 Adaptive',
videoid: '视频 ID: ',
inbrowser_adaptive_merger:
'浏览器版自适应视频及声音合成器 (FFmpeg)',
dlmp4: '一键下载高画质 mp4'
},
kr: {
togglelinks: '링크 보이기/숨기기',
stream: '스트리밍',
adaptive: '조정 가능한',
videoid: 'Video Id: '
},
es: {
togglelinks: 'Mostrar/Ocultar Links',
stream: 'Stream',
adaptive: 'Adaptable',
videoid: 'Id del Video: ',
inbrowser_adaptive_merger: 'Acoplar Audio a Video (FFmpeg)'
},
he: {
togglelinks: 'הצג/הסתר קישורים',
stream: 'סטרים',
adaptive: 'אדפטיבי',
videoid: 'מזהה סרטון: '
}
}
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 = 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 = /=([a-zA-Z0-9\$]+?)\(decodeURIComponent/.exec(
data
)
const fnname = fnnameresult[1]
const _argnamefnbodyresult = new RegExp(
escapeRegExp(fnname) + '=function\\((.+?)\\){(.+?)}'
).exec(data)
const [_, argname, fnbody] = _argnamefnbodyresult
const helpernameresult = /;(.+?)\..+?\(/.exec(fnbody)
const helpername = helpernameresult[1]
const helperresult = new RegExp(
'var ' + escapeRegExp(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=${id}&el=detailpage`
)
.text()
.then(async data => {
const obj = parseQuery(data)
const playerResponse = JSON.parse(obj.player_response)
logger.log(`video %s data: %o`, id, obj)
logger.log(`video %s playerResponse: %o`, id, playerResponse)
if (obj.status === 'fail') {
throw obj
}
let stream = []
if (playerResponse.streamingData.formats) {
stream = playerResponse.streamingData.formats.map(x =>
Object.assign(x, parseQuery(x.cipher))
)
logger.log(`video %s stream: %o`, id, stream)
if (stream[0].sp && stream[0].sp.includes('sig')) {
stream = stream
.map(x => ({ ...x, s: decsig(x.s) }))
.map(x => ({ ...x, url: x.url + `&sig=${x.s}` }))
}
}
let adaptive = []
if (playerResponse.streamingData.adaptiveFormats) {
adaptive = playerResponse.streamingData.adaptiveFormats.map(
x => Object.assign(x, parseQuery(x.cipher))
)
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=${x.s}` }))
}
}
logger.log(`video %s result: %o`, id, { stream, adaptive })
return { stream, adaptive, meta: obj }
})
}
const getVideoDetails = id =>
xf
.get('https://www.googleapis.com/youtube/v3/videos', {
qs: {
key: 'AIzaSyA_zdfwEy2ULfPCTlwk9DfhBVs2H5qGNU8',
part: 'snippet',
id
}
})
.json(r => r.items[0])
const workerMessageHandler = async e => {
const decsig = await xf.get(e.data.path).text(parseDecsig)
const result = await getVideo(e.data.id, decsig)
self.postMessage(result)
}
const ytdlWorkerCode = `
importScripts('https://unpkg.com/xfetch-js@0.3.4/xfetch.min.js')
const DEBUG=${DEBUG}
const logger=(${createLogger})(console, 'YTDL')
const escapeRegExp=${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)
logger.log('workerGetVideo end: %o', e.data)
res(e.data)
}
ytdlWorker.addEventListener('message', callback)
ytdlWorker.postMessage({ id, path })
})
}
const determineChunksNum = size => {
const n = Math.ceil(size / (1024 * 1024 * 3)) // 3 MB
return n
}
// video downloader
const xhrDownloadUint8Array = async (
{ url, contentLength },
progressCb
) => {
if (typeof contentLength === 'string')
contentLength = parseInt(contentLength)
progressCb({
loaded: 0,
total: contentLength,
speed: 0
})
const chunkSize = Math.floor(
contentLength / determineChunksNum(contentLength)
)
const getBuffer = (start, end) =>
new Promise((res, rej) => {
const xhr = {}
xhr.responseType = 'arraybuffer'
xhr.method = 'GET'
xhr.url = url
xhr.headers = {
'User-Agent':
'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.124 Safari/537.36',
Range: `bytes=${start}-${end ? end - 1 : ''}`,
'Accept-Encoding': 'identity',
'Accept-Language': 'en-us,en;q=0.5',
'Accept-Charset': 'ISO-8859-1,utf-8;q=0.7,*;q=0.7'
}
xhr.onload = obj => res(obj.response)
GM_xmlhttpRequest(xhr)
})
const data = new Uint8Array(contentLength)
let downloaded = 0
const queue = new pQueue.default({ concurrency: 5 })
const startTime = Date.now()
const ps = []
for (let start = 0; start < contentLength; start += chunkSize) {
const exceeded = start + chunkSize > contentLength
const curChunkSize = exceeded ? contentLength - start : chunkSize
const end = exceeded ? null : start + chunkSize
const p = queue.add(() =>
getBuffer(start, end).then(buf => {
downloaded += curChunkSize
data.set(new Uint8Array(buf), start)
const ds = (Date.now() - startTime + 1) / 1000
progressCb({
loaded: downloaded,
total: contentLength,
speed: downloaded / ds
})
})
)
ps.push(p)
}
await Promise.all(ps)
return data
}
const ffWorker = FFmpeg.createWorker({
logger: DEBUG ? m => logger.log(m.message) : () => {}
})
let ffWorkerLoaded = false
const mergeVideo = async (video, audio) => {
if (!ffWorkerLoaded) await ffWorker.load()
await ffWorker.write('video.mp4', video)
await ffWorker.write('audio.mp4', audio)
await ffWorker.run('-i video.mp4 -i audio.mp4 -c copy output.mp4', {
input: ['video.mp4', 'audio.mp4'],
output: 'output.mp4'
})
const { data } = await ffWorker.read('output.mp4')
await ffWorker.remove('output.mp4')
return data
}
const triggerDownload = (url, filename) => {
const a = document.createElement('a')
a.href = url
a.download = filename
document.body.appendChild(a)
a.click()
a.remove()
}
const dlModalTemplate = `
<div style="width: 100%; height: 100%;">
<div v-if="merging" style="height: 100%; width: 100%; display: flex; justify-content: center; align-items: center; font-size: 24px;">Merging video, please wait...</div>
<div v-else style="height: 100%; width: 100%; display: flex; flex-direction: column;">
<div style="flex: 1; margin: 10px;">
<p style="font-size: 24px;">Video</p>
<progress style="width: 100%;" :value="video.progress" min="0" max="100"></progress>
<div style="display: flex; justify-content: space-between;">
<span>{{video.speed}} kB/s</span>
<span>{{video.loaded}}/{{video.total}} MB</span>
</div>
</div>
<div style="flex: 1; margin: 10px;">
<p style="font-size: 24px;">Audio</p>
<progress style="width: 100%;" :value="audio.progress" min="0" max="100"></progress>
<div style="display: flex; justify-content: space-between;">
<span>{{audio.speed}} kB/s</span>
<span>{{audio.loaded}}/{{audio.total}} MB</span>
</div>
</div>
</div>
</div>
`
function openDownloadModel(adaptive, title) {
const win = open(
'',
'Video Download',
`toolbar=no,height=${screen.height / 2},width=${screen.width /
2},left=${screenLeft},top=${screenTop}`
)
const div = win.document.createElement('div')
win.document.body.appendChild(div)
win.document.title = `Downloading "${title}"`
const dlModalApp = new Vue({
template: dlModalTemplate,
data() {
return {
video: {
progress: 0,
total: 0,
loaded: 0,
speed: 0
},
audio: {
progress: 0,
total: 0,
loaded: 0,
speed: 0
},
merging: false
}
},
methods: {
async start(adaptive, title) {
win.onbeforeunload = () => true
// YouTube's default order is descending by video quality
const videoObj = adaptive
.filter(x => x.mimeType.includes('video/mp4'))
.map(v => {
const [_, quality, fps] = /(\d+)p(\d*)/.exec(
v.qualityLabel
)
v.qualityNum = parseInt(quality)
v.fps = fps ? parseInt(fps) : 30
return v
})
.sort((a, b) => {
if (a.qualityNum === b.qualityNum)
return b.fps - a.fps // ex: 30-60=-30, then a will be put before b
return b.qualityNum - a.qualityNum
})[0]
const audioObj = adaptive.find(x =>
x.mimeType.includes('audio/mp4')
)
const vPromise = xhrDownloadUint8Array(videoObj, e => {
this.video.progress = (e.loaded / e.total) * 100
this.video.loaded = (e.loaded / 1024 / 1024).toFixed(2)
this.video.total = (e.total / 1024 / 1024).toFixed(2)
this.video.speed = (e.speed / 1024).toFixed(2)
})
const aPromise = xhrDownloadUint8Array(audioObj, e => {
this.audio.progress = (e.loaded / e.total) * 100
this.audio.loaded = (e.loaded / 1024 / 1024).toFixed(2)
this.audio.total = (e.total / 1024 / 1024).toFixed(2)
this.audio.speed = (e.speed / 1024).toFixed(2)
})
const [varr, aarr] = await Promise.all([vPromise, aPromise])
this.merging = true
win.onunload = () => {
// trigger download when user close it
const bvurl = URL.createObjectURL(new Blob([varr]))
const baurl = URL.createObjectURL(new Blob([aarr]))
triggerDownload(bvurl, title + '-videoonly.mp4')
triggerDownload(baurl, title + '-audioonly.mp4')
}
const result = await Promise.race([
mergeVideo(varr, aarr),
sleep(1000 * 25).then(() => null)
])
if (!result) {
alert('An error has occurred when merging video')
const bvurl = URL.createObjectURL(new Blob([varr]))
const baurl = URL.createObjectURL(new Blob([aarr]))
triggerDownload(bvurl, title + '-videoonly.mp4')
triggerDownload(baurl, title + '-audioonly.mp4')
return this.close()
}
this.merging = false
const url = URL.createObjectURL(new Blob([result]))
triggerDownload(url, title + '.mp4')
win.onbeforeunload = null
win.onunload = null
win.close()
}
}
}).$mount(div)
dlModalApp.start(adaptive, title)
}
const template = `
<div class="box" :class="{'dark':dark}">
<div v-if="adaptive.length" class="of-h t-center c-pointer lh-20">
<a class="fs-14px" @click="dlmp4" v-text="strings.dlmp4"></a>
</div>
<div @click="hide=!hide" class="box-toggle div-a t-center fs-14px c-pointer lh-20" v-text="strings.togglelinks"></div>
<div :class="{'hide':hide}">
<div class="t-center fs-14px" v-text="strings.videoid+id"></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.qualityLabel,vid.mimeType].filter(x=>x).join(':')"></a>
</div>
</div>
<div class="of-h t-center">
<a class="fs-14px" 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: [],
meta: null,
dark: false,
lang: findLang(navigator.language)
}
},
computed: {
strings() {
return LOCALE[this.lang.toLowerCase()]
}
},
methods: {
dlmp4() {
const r = JSON.parse(this.meta.player_response)
openDownloadModel(this.adaptive, r.videoDetails.title)
}
},
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) {
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 = $html.getAttribute('dark') === 'true'
const css = `
.hide{
display: none;
}
.t-center{
text-align: center;
}
.d-flex{
display: flex;
}
.f-1{
flex: 1;
}
.fs-14px{
font-size: 14px;
}
.of-h{
overflow: hidden;
}
.box{
border-bottom: 1px solid var(--yt-border-color);
font-family: Arial;
}
.box-toggle{
margin: 3px;
user-select: none;
-moz-user-select: -moz-none;
}
.ytdl-link-btn{
display: block;
border: 1px solid !important;
border-radius: 3px;
text-decoration: none !important;
outline: 0;
text-align: center;
padding: 2px;
margin: 5px;
color: black;
}
a, .div-a{
text-decoration: none;
color: var(--yt-button-color, inherit);
}
a:hover, .div-a:hover{
color: var(--yt-spec-call-to-action, blue);
}
.box.dark{
color: var(--ytd-video-primary-info-renderer-title-color, var(--yt-primary-text-color));
}
.box.dark .ytdl-link-btn{
color: var(--ytd-video-primary-info-renderer-title-color, var(--yt-primary-text-color));
}
.box.dark .ytdl-link-btn:hover{
color: rgba(200, 200, 255, 0.8);
}
.box.dark .box-toggle:hover{
color: rgba(200, 200, 255, 0.8);
}
.c-pointer{
cursor: pointer;
}
.lh-20{
line-height: 20px;
}
`
shadow.appendChild($el('style', { textContent: css }))
})()
Wrap
Beautify