Show youtube download link on the left side without external service.
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// ==UserScript==
// @name Local YouTube Downloader
// @namespace https://blog.maple3142.net/
// @version 0.3.4
// @description Show youtube download link on the left side without external service.
// @author maple3142
// @require https://code.jquery.com/jquery-3.2.1.slim.min.js
// @match https://www.youtube.com/*
// @grant GM_addStyle
// @license MIT
// ==/UserScript==
;(function() {
'use strict'
const xhrget = url =>
new Promise((res, rej) => {
const xhr = new XMLHttpRequest()
xhr.open('HEAD', url)
xhr.onreadystatechange = () => {
if (xhr.readyState === xhr.DONE) {
res(xhr.responseText)
}
}
xhr.onerror = rej
xhr.send()
})
// type "__YTDL_LINK_DECSIG.toString().split('\n').join('')" in console to get fallback
const fallback = function anonymous(a) {
var gL = {
pk: function(a) {
a.reverse()
},
k9: function(a, b) {
a.splice(0, b)
},
TA: function(a, b) {
var c = a[0]
a[0] = a[b % a.length]
a[b % a.length] = c
}
}
a = a.split('')
gL.k9(a, 3)
gL.TA(a, 44)
gL.k9(a, 2)
gL.TA(a, 34)
return a.join('')
}
const getytplayer = async () => {
if (ytplayer && ytplayer.config) return ytplayer
const html = await fetch(location.href).then(r => r.text())
const d = /<script >(var ytplayer[\s\S]*?)ytplayer\.load/.exec(html)
let config = eval(d[1])
unsafeWindow.ytplayer = {
config
}
return ytplayer
}
const getdecsig = async path => {
return xhrget('https://www.youtube.com' + path)
.then(data => {
const fnname = /\"signature\"\),.+?\.set\(.+?,(.+?)\(/.exec(data)[1]
const [_, argname, fnbody] = new RegExp(fnname + '=function\\((.+?)\\){(.+?)}').exec(data)
//console.log(fnbody)
const helpername = /;(.+?)\..+?\(/.exec(fnbody)[1]
//console.log(helpername)
const helper = new RegExp('var ' + helpername + '={[\\s\\S]+?};').exec(data)[0]
//console.log(helper)
return new Function([argname], helper + ';' + fnbody)
})
.catch(e => fallback)
.then(fn => (unsafeWindow.__YTDL_LINK_DECSIG = fn))
}
const parseQuery = s =>
Object.assign(
...s
.split('&')
.map(x => x.split('='))
.map(p => ({ [p[0]]: decodeURIComponent(p[1]) }))
)
const getVideo = async id => {
const ytplayer = await getytplayer()
const decsig = await getdecsig(ytplayer.config.assets.js)
return fetch(`https://www.youtube.com/get_video_info?video_id=${id}`)
.then(r => r.text())
.then(async data => {
const obj = parseQuery(data)
if (obj.status === 'fail') {
throw obj
}
let stream = []
if (obj.url_encoded_fmt_stream_map) {
stream = obj.url_encoded_fmt_stream_map.split(',').map(parseQuery)
if (stream[0].sp && stream[0].sp.includes('signature')) {
stream = stream
.map(x => ({ ...x, s: decsig(x.s) }))
.map(x => ({ ...x, url: x.url + `&signature=${x.s}` }))
}
}
let adaptive = []
if (obj.adaptive_fmts) {
adaptive = obj.adaptive_fmts.split(',').map(parseQuery)
if (adaptive[0].sp && adaptive[0].sp.includes('signature')) {
adaptive = adaptive
.map(x => ({ ...x, s: decsig(x.s) }))
.map(x => ({ ...x, url: x.url + `&signature=${x.s}` }))
}
}
return { stream, adaptive }
})
}
const $box = $('<div>')
.attr('id', 'ytdl-box')
.css('z-index', '10000')
const boxel = $box.get(0)
const $toggle = $('<div>')
.attr('id', 'ytdl-box-toggle')
.css('text-align', 'center')
.text('Toggle Links')
const $content = $('<div>').attr('id', 'ytdl-content')
const $id = $('<div>')
const $bbox = $('<box>').css('display', 'flex')
const $stream = $('<div>').css('flex', 1)
const $adaptive = $('<div>').css('flex', 1)
let hide = true
$box.append($toggle).append($content)
$toggle.on('click', e => {
if (hide) $content.addClass('show')
else $content.removeClass('show')
hide = !hide
})
$content.append($id).append($bbox.append($stream).append($adaptive))
const load = id =>
getVideo(id)
.then(data => {
console.log('load new: %s', id)
$id.empty().append(
$('<div>')
.addClass('ytdl-link-title')
.text(id)
)
$stream.empty().append(
$('<div>')
.addClass('ytdl-link-title')
.text('Stream')
)
data.stream
.map(x =>
$('<a>')
.text(x.quality || x.type)
.attr('href', x.url)
.attr('title', x.type)
.attr('target', '_blank')
.addClass('ytdl-link-btn')
)
.forEach($li => $stream.append($li))
$adaptive.empty().append(
$('<div>')
.addClass('ytdl-link-title')
.text('Adaptive')
)
data.adaptive
.map(x =>
$('<a>')
.text((x.quality_label ? x.quality_label + ':' : '') + x.type)
.attr('href', x.url)
.attr('title', x.type)
.attr('target', '_blank')
.addClass('ytdl-link-btn')
)
.forEach($li => $adaptive.append($li))
})
.catch(err => console.error('load', err))
let prevurl = null
document.addEventListener('transitionend', e => {
setTimeout(() => {
if (location.href === prevurl) return
prevurl = location.href
const q = parseQuery(location.search.slice(1))
if (e.target.id === 'progress') {
load(q.v)
}
}, 100)
})
setInterval(() => {
const el = document.querySelector('#info-contents')
if (el && !el.contains(boxel)) el.appendChild(boxel)
}, 1000)
const q = parseQuery(location.search.slice(1))
if (q.v) load(q.v)
GM_addStyle(`
#ytdl-box-toggle{
margin: 3px;
user-select: none;
}
#ytdl-box-toggle:hover{
color: blue;
}
#ytdl-content{
max-height: 0;
overflow: hidden;
transition: ease 1s;
}
#ytdl-content.show{
max-height: 600px;
}
.ytdl-link-title{
text-align: center;
font-size: 140%;
margin: 1px;
}
.ytdl-link-btn{
display: block;
border: 1px solid;
border-radius: 3px;
text-align: center;
padding: 2px;
margin: 5px;
color: black;
}
a.ytdl-link-btn{
text-decoration: none;
}
a.ytdl-link-btn:hover{
color: blue;
}
`)
})()