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378 lines
11 KiB
JavaScript
378 lines
11 KiB
JavaScript
const urllib = require('url');
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const querystring = require('querystring');
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const sax = require('sax');
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const request = require('miniget');
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const util = require('./util');
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const extras = require('./info-extras');
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const sig = require('./sig');
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const FORMATS = require('./formats');
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const VIDEO_URL = 'https://www.youtube.com/watch?v=';
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const EMBED_URL = 'https://www.youtube.com/embed/';
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const VIDEO_EURL = 'https://youtube.googleapis.com/v/';
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const INFO_HOST = 'www.youtube.com';
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const INFO_PATH = '/get_video_info';
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const KEYS_TO_SPLIT = [
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'keywords',
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'fmt_list',
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'fexp',
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'watermark'
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];
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/**
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* Gets info from a video without getting additional formats.
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*
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* @param {String} id
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* @param {Object} options
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* @param {Function(Error, Object)} callback
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*/
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exports.getBasicInfo = (id, options, callback) => {
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// Try getting config from the video page first.
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const params = 'hl=' + (options.lang || 'en');
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let url = VIDEO_URL + id + '&' + params +
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'&bpctr=' + Math.ceil(Date.now() / 1000);
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// Remove header from watch page request.
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// Otherwise, it'll use a different framework for rendering content.
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const reqOptions = Object.assign({}, options.requestOptions);
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reqOptions.headers = Object.assign({}, reqOptions.headers, {
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'User-Agent': ''
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});
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request(url, reqOptions, (err, res, body) => {
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if (err) return callback(err);
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// Check if there are any errors with this video page.
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const unavailableMsg = util.between(body, '<div id="player-unavailable"', '>');
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if (unavailableMsg &&
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!/\bhid\b/.test(util.between(unavailableMsg, 'class="', '"'))) {
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// Ignore error about age restriction.
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if (!body.includes('<div id="watch7-player-age-gate-content"')) {
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return callback(new Error(util.between(body,
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'<h1 id="unavailable-message" class="message">', '</h1>').trim()));
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}
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}
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// Parse out additional metadata from this page.
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const additional = {
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// Get the author/uploader.
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author: extras.getAuthor(body),
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// Get the day the vid was published.
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published: extras.getPublished(body),
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// Get description.
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description: extras.getVideoDescription(body),
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// Get media info.
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media: extras.getVideoMedia(body),
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// Get related videos.
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related_videos: extras.getRelatedVideos(body),
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// Give the standard link to the video.
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video_url: VIDEO_URL + id,
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};
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const jsonStr = util.between(body, 'ytplayer.config = ', '</script>');
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let config;
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if (jsonStr) {
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config = jsonStr.slice(0, jsonStr.lastIndexOf(';ytplayer.load'));
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gotConfig(id, options, additional, config, false, callback);
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} else {
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// If the video page doesn't work, maybe because it has mature content.
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// and requires an account logged in to view, try the embed page.
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url = EMBED_URL + id + '?' + params;
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request(url, options.requestOptions, (err, res, body) => {
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if (err) return callback(err);
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config = util.between(body, 't.setConfig({\'PLAYER_CONFIG\': ', '},\'');
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gotConfig(id, options, additional, config, true, callback);
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});
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}
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});
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};
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/**
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* @param {Object} id
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* @param {Object} options
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* @param {Object} additional
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* @param {Object} config
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* @param {Boolean} fromEmbed
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* @param {Function(Error, Object)} callback
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*/
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function gotConfig(id, options, additional, config, fromEmbed, callback) {
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if (!config) {
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return callback(new Error('Could not find player config'));
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}
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try {
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config = JSON.parse(config + (fromEmbed ? '}' : ''));
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} catch (err) {
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return callback(new Error('Error parsing config: ' + err.message));
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}
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const url = urllib.format({
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protocol: 'https',
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host: INFO_HOST,
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pathname: INFO_PATH,
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query: {
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video_id: id,
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eurl: VIDEO_EURL + id,
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ps: 'default',
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gl: 'US',
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hl: (options.lang || 'en'),
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sts: config.sts,
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},
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});
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request(url, options.requestOptions, (err, res, body) => {
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if (err) return callback(err);
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let info = querystring.parse(body);
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if (info.status === 'fail') {
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if (info.errorcode === '150' && config.args) {
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info = config.args;
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info.no_embed_allowed = true;
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} else {
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return callback(
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new Error(`Code ${info.errorcode}: ${util.stripHTML(info.reason)}`));
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}
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}
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const player_response = config.args.player_response || info.player_response;
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if (player_response) {
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try {
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info.player_response = JSON.parse(player_response);
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} catch (err) {
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return callback(
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new Error('Error parsing `player_response`: ' + err.message));
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}
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let playability = info.player_response.playabilityStatus;
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if (playability && playability.status === 'UNPLAYABLE') {
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return callback(new Error(playability.reason));
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}
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}
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// Split some keys by commas.
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KEYS_TO_SPLIT.forEach((key) => {
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if (!info[key]) return;
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info[key] = info[key]
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.split(',')
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.filter((v) => v !== '');
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});
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info.fmt_list = info.fmt_list ?
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info.fmt_list.map((format) => format.split('/')) : [];
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info.formats = util.parseFormats(info);
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// Add additional properties to info.
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Object.assign(info, additional);
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info.age_restricted = fromEmbed;
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info.html5player = config.assets.js;
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if (config.args.dashmpd && info.dashmpd !== config.args.dashmpd) {
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info.dashmpd2 = config.args.dashmpd;
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}
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callback(null, info);
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});
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}
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/**
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* Gets info from a video additional formats and deciphered URLs.
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*
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* @param {String} id
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* @param {Object} options
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* @param {Function(Error, Object)} callback
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*/
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exports.getFullInfo = (id, options, callback) => {
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return exports.getBasicInfo(id, options, (err, info) => {
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if (err) return callback(err);
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if (info.formats.length ||
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info.dashmpd || info.dashmpd2 || info.hlsvp) {
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const html5playerfile = urllib.resolve(VIDEO_URL, info.html5player);
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sig.getTokens(html5playerfile, options, (err, tokens) => {
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if (err) return callback(err);
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sig.decipherFormats(info.formats, tokens, options.debug);
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let funcs = [];
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if (info.dashmpd) {
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info.dashmpd = decipherURL(info.dashmpd, tokens);
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funcs.push(getDashManifest.bind(null, info.dashmpd, options));
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}
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if (info.dashmpd2) {
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info.dashmpd2 = decipherURL(info.dashmpd2, tokens);
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funcs.push(getDashManifest.bind(null, info.dashmpd2, options));
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}
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if (info.hlsvp) {
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info.hlsvp = decipherURL(info.hlsvp, tokens);
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funcs.push(getM3U8.bind(null, info.hlsvp, options));
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}
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util.parallel(funcs, (err, results) => {
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if (err) return callback(err);
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if (results[0]) { mergeFormats(info, results[0]); }
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if (results[1]) { mergeFormats(info, results[1]); }
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if (results[2]) { mergeFormats(info, results[2]); }
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if (!info.formats.length) {
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callback(new Error('No formats found'));
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return;
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}
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if (options.debug) {
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info.formats.forEach((format) => {
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const itag = format.itag;
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if (!FORMATS[itag]) {
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console.warn(`No format metadata for itag ${itag} found`);
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}
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});
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}
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info.formats.forEach(util.addFormatMeta);
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info.formats.sort(util.sortFormats);
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info.full = true;
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callback(null, info);
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});
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});
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} else {
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callback(new Error('This video is unavailable'));
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}
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});
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};
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/**
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* @param {String} url
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* @param {Array.<String>} tokens
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*/
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function decipherURL(url, tokens) {
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return url.replace(/\/s\/([a-fA-F0-9.]+)/, (_, s) => {
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return '/signature/' + sig.decipher(tokens, s);
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});
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}
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/**
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* Merges formats from DASH or M3U8 with formats from video info page.
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*
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* @param {Object} info
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* @param {Object} formatsMap
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*/
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function mergeFormats(info, formatsMap) {
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info.formats.forEach((f) => {
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if (!formatsMap[f.itag]) {
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formatsMap[f.itag] = f;
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}
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});
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info.formats = [];
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for (let itag in formatsMap) { info.formats.push(formatsMap[itag]); }
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}
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/**
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* Gets additional DASH formats.
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*
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* @param {String} url
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* @param {Object} options
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* @param {Function(!Error, Array.<Object>)} callback
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*/
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function getDashManifest(url, options, callback) {
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let formats = {};
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const parser = sax.parser(false);
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parser.onerror = callback;
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parser.onopentag = (node) => {
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if (node.name === 'REPRESENTATION') {
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const itag = node.attributes.ID;
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formats[itag] = { itag, url };
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}
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};
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parser.onend = () => { callback(null, formats); };
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const req = request(urllib.resolve(VIDEO_URL, url), options.requestOptions);
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req.setEncoding('utf8');
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req.on('error', callback);
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req.on('data', (chunk) => { parser.write(chunk); });
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req.on('end', parser.close.bind(parser));
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}
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/**
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* Gets additional formats.
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*
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* @param {String} url
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* @param {Object} options
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* @param {Function(!Error, Array.<Object>)} callback
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*/
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function getM3U8(url, options, callback) {
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url = urllib.resolve(VIDEO_URL, url);
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request(url, options.requestOptions, (err, res, body) => {
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if (err) return callback(err);
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let formats = {};
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body
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.split('\n')
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.filter((line) => /https?:\/\//.test(line))
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.forEach((line) => {
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const itag = line.match(/\/itag\/(\d+)\//)[1];
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formats[itag] = { itag: itag, url: line };
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});
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callback(null, formats);
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});
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}
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// Cached for getting basic/full info.
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exports.cache = new Map();
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exports.cache.timeout = 1000;
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// Cache get info functions.
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// In case a user wants to get a video's info before downloading.
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for (let fnName of ['getBasicInfo', 'getFullInfo']) {
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/**
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* @param {String} link
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* @param {Object} options
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* @param {Function(Error, Object)} callback
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*/
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const fn = exports[fnName];
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exports[fnName] = (link, options, callback) => {
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if (typeof options === 'function') {
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callback = options;
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options = {};
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} else if (!options) {
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options = {};
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}
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if (!callback) {
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return new Promise((resolve, reject) => {
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exports[fnName](link, options, (err, info) => {
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if (err) return reject(err);
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resolve(info);
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});
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});
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}
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const id = util.getVideoID(link);
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if (id instanceof Error) return callback(id);
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const key = [fnName, id, options.lang].join('-');
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if (exports.cache.has(key)) {
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callback(null, exports.cache.get(key));
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} else {
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fn(id, options, (err, info) => {
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if (err) return callback(err);
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exports.cache.set(key, info);
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setTimeout(() => { exports.cache.delete(key); }, exports.cache.timeout);
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callback(null, info);
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});
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}
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};
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}
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