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Allows you to download subtitles from Netflix
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// ==UserScript==
// @name Netflix - subtitle downloader
// @description Allows you to download subtitles from Netflix
// @license MIT
// @version 3.3.0
// @namespace tithen-firion.github.io
// @include https://www.netflix.com/*
// @grant unsafeWindow
// @require https://cdn.jsdelivr.net/gh/Stuk/jszip@579beb1d45c8d586d8be4411d5b2e48dea018c06/dist/jszip.min.js?version=3.1.5
// @require https://cdn.jsdelivr.net/gh/eligrey/FileSaver.js@283f438c31776b622670be002caf1986c40ce90c/dist/FileSaver.min.js?version=2018-12-29
// ==/UserScript==
class ProgressBar {
constructor(max) {
this.current = 0;
this.max = max;
let container = document.querySelector('#userscript_progress_bars');
if(container === null) {
container = document.createElement('div');
container.id = 'userscript_progress_bars'
document.body.appendChild(container)
container.style
container.style.position = 'fixed';
container.style.top = 0;
container.style.left = 0;
container.style.width = '100%';
container.style.background = 'red';
container.style.zIndex = '99999999';
}
this.progressElement = document.createElement('div');
this.progressElement.innerHTML = 'Click to stop';
this.progressElement.style.cursor = 'pointer';
this.progressElement.style.fontSize = '16px';
this.progressElement.style.textAlign = 'center';
this.progressElement.style.width = '100%';
this.progressElement.style.height = '20px';
this.progressElement.style.background = 'transparent';
this.stop = new Promise(resolve => {
this.progressElement.addEventListener('click', () => {resolve(STOP_THE_DOWNLOAD)});
});
container.appendChild(this.progressElement);
}
increment() {
this.current += 1;
if(this.current <= this.max) {
let p = this.current / this.max * 100;
this.progressElement.style.background = `linear-gradient(to right, green ${p}%, transparent ${p}%)`;
}
}
destroy() {
this.progressElement.remove();
}
}
const STOP_THE_DOWNLOAD = 'NETFLIX_SUBTITLE_DOWNLOADER_STOP_THE_DOWNLOAD';
const MAIN_TITLE = '.player-status-main-title, .ellipsize-text>h4, .video-title>h4';
const TRACK_MENU = '#player-menu-track-settings, .audio-subtitle-controller';
const NEXT_EPISODE = '.player-next-episode:not(.player-hidden), .button-nfplayerNextEpisode';
const WEBVTT = 'webvtt-lssdh-ios8';
const DOWNLOAD_MENU = `<lh class="list-header">Netflix subtitle downloader</lh>
<li class="list-header">Netflix subtitle downloader</li>
<li class="track download">Download subs for this episode</li>
<li class="track download-all">Download subs from this ep till last available</li>
<li class="track force-all-lang">Force Netflix to show all languages: <span></span></li>
<li class="track lang-setting">Languages to download: <span></span></li>`;
const SCRIPT_CSS = `.player-timed-text-tracks, .track-list-subtitles{ border-right:1px solid #000 }
.player-timed-text-tracks+.player-timed-text-tracks, .track-list-subtitles+.track-list-subtitles{ border-right:0 }
.subtitle-downloader-menu { list-style:none }
#player-menu-track-settings .subtitle-downloader-menu li.list-header,
.audio-subtitle-controller .subtitle-downloader-menu lh.list-header{ display:none }`;
const SUB_TYPES = {
'subtitles': '',
'closedcaptions': '[cc]'
};
let zip;
let subCache = {};
let batch = false;
let forceSubs = localStorage.getItem('NSD_force-all-lang') !== 'false';
let langs = localStorage.getItem('NSD_lang-setting') || '';
const setForceText = () => {
document.querySelector('.subtitle-downloader-menu > .force-all-lang > span').innerHTML = (forceSubs ? 'on' : 'off');
};
const setLangsText = () => {
document.querySelector('.subtitle-downloader-menu > .lang-setting > span').innerHTML = (langs === '' ? 'all' : langs);
};
const toggleForceLang = () => {
forceSubs = !forceSubs;
if(forceSubs)
localStorage.removeItem('NSD_force-all-lang');
else
localStorage.setItem('NSD_force-all-lang', forceSubs);
document.location.reload();
};
const setLangToDownload = () => {
const result = prompt('Languages to download, comma separated. Leave empty to download all subtitles.\nExample: en,de,fr', langs);
if(result !== null) {
langs = result;
if(langs === '')
localStorage.removeItem('NSD_lang-setting');
else
localStorage.setItem('NSD_lang-setting', langs);
setLangsText();
}
};
const asyncSleep = (seconds, value) => new Promise(resolve => {
window.setTimeout(resolve, seconds * 1000, value);
});
const popRandomElement = arr => {
return arr.splice(arr.length * Math.random() << 0, 1)[0];
};
// get show name or full name with episode number
const __getTitle = full => {
if(typeof full === 'undefined')
full = true;
const titleElement = document.querySelector(MAIN_TITLE);
if(titleElement === null)
return null;
const title = [titleElement.textContent.replace(/[:*?"<>|\\\/]+/g, '_').replace(/ /g, '.')];
if(full) {
const episodeElement = titleElement.nextElementSibling;
if(episodeElement) {
const m = episodeElement.textContent.match(/^[^\d]*(\d+)[^\d]+(\d+)[^\d]*$/);
if(m && m.length == 3) {
title.push(`S${m[1].padStart(2, '0')}E${m[2].padStart(2, '0')}`);
}
else {
title.push(episodeElement.textContent.trim().replace(/[:*?"<>|\\\/]+/g, '_').replace(/ /g, '.'));
}
}
title.push('WEBRip.Netflix');
}
return title.join('.');
};
// helper function, periodically checking for the title and resolving promise if found
const _getTitle = (full, resolve) => {
const title = __getTitle(full);
if(title === null)
window.setTimeout(_getTitle, 200, full, resolve);
else
resolve(title);
};
// promise of a title
const getTitle = full => new Promise(resolve => {
_getTitle(full, resolve);
});
const processSubInfo = async result => {
const tracks = result.timedtexttracks;
const titleP = getTitle();
const subs = {};
for(const track of tracks) {
if(track.isNoneTrack)
continue;
if(typeof track.ttDownloadables[WEBVTT] === 'undefined')
continue;
let type = SUB_TYPES[track.rawTrackType];
if(typeof type === 'undefined')
type = `[${track.rawTrackType}]`;
const lang = track.language + type + (track.isForcedNarrative ? '-forced' : '');
subs[lang] = Object.values(track.ttDownloadables[WEBVTT].downloadUrls);
}
subCache[result.movieId] = {titleP, subs};
if(batch) {
downloadAll();
}
};
const getMovieID = () => {
const id = window.location.pathname.split('/').pop();
let newID = undefined;
try {
newID = unsafeWindow.netflix.falcorCache.videos[id].current.value[1];
}
catch(ignore) {}
if(typeof newID === 'undefined')
return id;
else
return newID;
};
const _save = async (_zip, title) => {
const content = await _zip.generateAsync({type:'blob'});
saveAs(content, title + '.zip');
};
const _download = async _zip => {
const showTitle = getTitle(false);
const {titleP, subs} = subCache[getMovieID()];
const downloaded = [];
let filteredLangs;
if(langs === '')
filteredLangs = Object.keys(subs);
else {
const regularExpression = new RegExp('^(' + langs.replace(/\-/g, '\\-').replace(/\s/g, '').replace(/,/g, '|') + ')');
filteredLangs = [];
for(const lang of Object.keys(subs)) {
if(lang.match(regularExpression))
filteredLangs.push(lang);
}
}
const progress = new ProgressBar(filteredLangs.length);
let stop = false;
for(const lang of filteredLangs) {
const urls = subs[lang]
while(urls.length > 0) {
let url = popRandomElement(urls);
const resultPromise = fetch(url, {mode: "cors"});
const result = await Promise.any([resultPromise, progress.stop, asyncSleep(30, STOP_THE_DOWNLOAD)]);
if(result === STOP_THE_DOWNLOAD) {
stop = true;
break;
}
progress.increment();
const data = await result.text();
if(data.length > 0) {
downloaded.push({lang, data});
break;
}
}
if(stop)
break;
}
const title = await titleP;
downloaded.forEach(x => {
const {lang, data} = x;
_zip.file(`${title}.${lang}.vtt`, data);
});
if(await Promise.any([progress.stop, {}]) === STOP_THE_DOWNLOAD)
stop = true;
progress.destroy();
return [await showTitle, stop];
};
const downloadThis = async () => {
const _zip = new JSZip();
const showTitle = await _download(_zip);
_save(_zip, showTitle);
};
const downloadAll = async () => {
zip = zip || new JSZip();
batch = true;
const [showTitle, stop] = await _download(zip);
const nextEp = document.querySelector(NEXT_EPISODE);
if(!stop && nextEp)
nextEp.click();
else {
await _save(zip, showTitle);
zip = undefined;
batch = false;
}
};
const processMessage = e => {
processSubInfo(e.detail);
}
const injection = () => {
const WEBVTT = 'webvtt-lssdh-ios8';
const MANIFEST_URL = "manifest";
const forceSubs = localStorage.getItem('NSD_force-all-lang') !== 'false';
// hijack JSON.parse and JSON.stringify functions
((parse, stringify) => {
JSON.parse = function (text) {
const data = parse(text);
if (data && data.result && data.result.timedtexttracks && data.result.movieId) {
window.dispatchEvent(new CustomEvent('netflix_sub_downloader_data', {detail: data.result}));
}
return data;
};
JSON.stringify = function (data) {
if (data && typeof data.url === 'string' && data.url.indexOf(MANIFEST_URL) > -1) {
for (let v of Object.values(data)) {
try {
if (v.profiles)
v.profiles.unshift(WEBVTT);
if (v.showAllSubDubTracks != null && forceSubs)
v.showAllSubDubTracks = true;
}
catch (e) {
if (e instanceof TypeError)
continue;
else
throw e;
}
}
}
return stringify(data);
};
})(JSON.parse, JSON.stringify);
}
window.addEventListener('netflix_sub_downloader_data', processMessage, false);
// inject script
const sc = document.createElement('script');
sc.innerHTML = '(' + injection.toString() + ')()';
document.head.appendChild(sc);
document.head.removeChild(sc);
// add CSS style
const s = document.createElement('style');
s.innerHTML = SCRIPT_CSS;
document.head.appendChild(s);
// add menu when it's not there
const observer = new MutationObserver(function(mutations) {
mutations.forEach(function(mutation) {
mutation.addedNodes.forEach(function(node) {
if(node.nodeName.toUpperCase() == 'DIV') {
let trackMenu = (node.parentNode || node).querySelector(TRACK_MENU);
if(trackMenu !== null && trackMenu.querySelector('.subtitle-downloader-menu') === null) {
let ol = document.createElement('ol');
ol.setAttribute('class', 'subtitle-downloader-menu player-timed-text-tracks track-list track-list-subtitles');
ol.innerHTML = DOWNLOAD_MENU;
trackMenu.appendChild(ol);
ol.querySelector('.download').addEventListener('click', downloadThis);
ol.querySelector('.download-all').addEventListener('click', downloadAll);
ol.querySelector('.force-all-lang').addEventListener('click', toggleForceLang);
ol.querySelector('.lang-setting').addEventListener('click', setLangToDownload);
setForceText();
setLangsText();
}
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });