Allows you to download subtitles from Netflix
// ==UserScript==
// @name Netflix - subtitle downloader
// @description Allows you to download subtitles from Netflix
// @license MIT
// @version 3.0.7
// @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==
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>`;
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;
const randomProperty = obj => {
const keys = Object.keys(obj);
return obj[keys[keys.length * Math.random() << 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]*?$/);
if(m && m.length == 3) {
if(typeof m[2] == 'undefined') // example: Stranger Things season 1
title.push(`S01E${m[1].padStart(2, '0')}`);
else
title.push(`S${m[1].padStart(2, '0')}E${m[2].padStart(2, '0')}`);
}
else {
title.push(encodeURIComponent(episodeElement.textContent.trim().replace(/\s+/, '.')));
}
}
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;
let type = SUB_TYPES[track.rawTrackType];
if(typeof type === 'undefined')
type = `[${track.rawTrackType}]`;
const lang = track.language + type + (track.isForcedNarrative ? '-forced' : '');
subs[lang] = randomProperty(track.ttDownloadables[WEBVTT].downloadUrls);
}
subCache[result.movieId] = {titleP, subs};
if(batch) {
downloadAll();
}
};
const getMovieID = () => window.location.pathname.split('/').pop();
const _save = async (_zip, title) => {
const content = await _zip.generateAsync({type:'blob'});
saveAs(content, title + '.zip');
};
const _download = async _zip => {
const showTitle = getTitle(false);
const {titleP, subs} = subCache[getMovieID()];
const downloaded = [];
for(const [lang, url] of Object.entries(subs)) {
const result = await fetch(url, {mode: "cors"});
const data = await result.text();
downloaded.push({lang, data});
}
const title = await titleP;
downloaded.forEach(x => {
const {lang, data} = x;
_zip.file(`${title}.${lang}.vtt`, data);
});
return await showTitle;
};
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 = await _download(zip);
const nextEp = document.querySelector(NEXT_EPISODE);
if(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';
// 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) {
if (data.params && data.params.profiles) {
data.params.profiles.unshift(WEBVTT);
}
if (data.ab && data.ab.profiles) {
data.ab.profiles.unshift(WEBVTT);
}
}
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);
}
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });