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infoextract.js
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const axios = require("axios");
const url = require("url");
const querystring = require('querystring');
const moment = require("moment");
const _ = require("lodash");
const storage = require("./storage");
const Video = require("./common/video.js");
const YOUTUBE_API_URL = "https://www.googleapis.com/youtube/v3";
const ADD_PREVIEW_SEARCH_MIN_LENGTH = 3;
const YtApi = axios.create({
baseURL: YOUTUBE_API_URL,
});
class UnsupportedServiceException extends Error {
constructor(hostname) {
super(`The service at "${hostname}" is not yet supported.`);
this.name = "UnsupportedServiceException";
}
}
class InvalidAddPreviewInputException extends Error {
constructor() {
super(`Your search query must at least ${ADD_PREVIEW_SEARCH_MIN_LENGTH} characters, or supply a Youtube video, playlist, or channel link.`);
this.name = "InvalidAddPreviewInputException";
}
}
module.exports = {
YtApi,
/**
* Gets all necessary information needed to represent a video. Handles
* local caching and obtaining missing data from external sources.
* @param {string} service The service that hosts the source video.
* @param {string} id The id of the video on the given service.
* @return {Video} Video object
*/
getVideoInfo(service, id) {
if (service === "youtube") {
if (!(/^[A-za-z0-9_-]+$/).exec(id)) {
throw new Error(`Invalid youtube video ID: ${id}`);
}
}
return storage.getVideoInfo(service, id).then(result => {
let video = _.cloneDeep(result);
let missingInfo = storage.getVideoInfoFields().filter(p => !video.hasOwnProperty(p));
if (missingInfo.length === 0) {
return new Video(video);
}
console.warn(`MISSING INFO for ${video.service}:${video.id}: ${missingInfo}`);
if (video.service === "youtube") {
return this.getVideoInfoYoutube([video.id], missingInfo).then(result => {
video = Object.assign(video, result[video.id]);
return new Video(video);
}).catch(err => {
if (err.response.status === 403) {
console.error("Failed to get youtube video info: Out of quota");
return this.getVideoLengthYoutube_Fallback(`https://youtube.com/watch?v=${video.id}`).then(videoLength => {
return new Video({
...video,
title: video.id,
length: videoLength,
});
});
}
else {
console.error("Failed to get youtube video info:", err);
throw err;
}
});
}
}).catch(err => {
console.error("Failed to get video metadata from database:", err);
});
},
/**
* Gets all necessary information needed to represent all videos in the
* given list. Handles local caching and obtaining missing data from
* external sources.
*
* This also optimizes the number of requests made to external sources.
* @param {Array.<Video|Object>} videos
* @returns {Promise.<Array.<Video>>}
*/
getManyVideoInfo(videos) {
let grouped = _.groupBy(videos, "service");
let retrievalPromises = [];
for (let service in grouped) {
let retrievalPromise = storage.getManyVideoInfo(grouped[service]).then(serviceVideos => {
// group by missing info
let groupedServiceVideos = _.groupBy(serviceVideos, video => storage.getVideoInfoFields().filter(p => !video.hasOwnProperty(p)));
if (service === "youtube") {
let promises = [];
for (let missingInfo in groupedServiceVideos) {
let missingInfoGroup = groupedServiceVideos[missingInfo];
if (!missingInfo) {
promises.push(new Promise(resolve => resolve(missingInfoGroup)));
continue;
}
promises.push(this.getVideoInfoYoutube(missingInfoGroup.map(video => video.id), missingInfo).then(results => _.values(results)));
}
return Promise.all(promises);
}
else {
console.error("Unknown service:", service);
return new Promise(resolve => resolve(serviceVideos));
}
});
retrievalPromises.push(retrievalPromise);
}
return Promise.all(retrievalPromises).then(results => {
results = _.flattenDeep(results);
// ensure the original order is preserved
let finalResults = [];
for (let result of results) {
let idx = _.findIndex(videos, {
service: result.service,
id: result.id,
});
finalResults[idx] = new Video(result);
}
return finalResults;
});
},
getService(link) {
if (typeof link !== "string") {
return false;
}
let srcUrl = url.parse(link);
if (srcUrl.host === null) {
return false;
}
if (srcUrl.host.endsWith("youtube.com") || srcUrl.host.endsWith("youtu.be")) {
return "youtube";
}
else {
return false;
}
},
getVideoIdYoutube(link) {
let urlParsed = url.parse(link);
if (urlParsed.host.endsWith("youtu.be")) {
return urlParsed.path.replace("/", "").trim();
}
else {
let query = querystring.parse(urlParsed.query);
if (query["v"]) {
return query["v"].trim();
}
else {
return null;
}
}
},
getChanneInfoYoutube(channelData) {
return YtApi.get('/channels' +
`?key=${process.env.YOUTUBE_API_KEY}&` +
'part=contentDetails&' +
`${Object.keys(channelData)[0] === 'channel' ? 'id' : 'forUsername'}=${Object.values(channelData)[0]}`
//if the link passed is a channel link, ie: /channel/$CHANNEL_ID, then the id filter must be used
//on the other hand, a user link requires the forUsername filter
).then(res => {
if (res.status === 200) {
return this.getPlaylistYoutube(
res.data.items[0].contentDetails.relatedPlaylists.uploads
).catch(err => console.error(err));
}
else {
console.error(`Failed with status code ${res.status}`);
}
}).catch(err => console.error(err));
},
getVideoInfoYoutube(ids, onlyProperties=null) {
if (!Array.isArray(ids)) {
throw "`ids` must be an array on video IDs.";
}
return new Promise((resolve, reject) => {
let parts = [];
if (onlyProperties !== null) {
if (onlyProperties.includes("title") || onlyProperties.includes("description") || onlyProperties.includes("thumbnail")) {
parts.push("snippet");
}
if (onlyProperties.includes("length")) {
parts.push("contentDetails");
}
if (parts.length === 0) {
console.error("onlyProperties must have valid values or be null! Found", onlyProperties);
return null;
}
}
else {
parts = [
"snippet",
"contentDetails",
];
}
YtApi.get(`/videos?key=${process.env.YOUTUBE_API_KEY}&part=${parts.join(",")}&id=${ids.join(",")}`).then(res => {
if (res.status !== 200) {
reject(`Failed with status code ${res.status}`);
return;
}
let results = {};
for (let i = 0; i < res.data.items.length; i++) {
let item = res.data.items[i];
let video = {
service: "youtube",
id: item.id,
};
if (item.snippet) {
video.title = item.snippet.title;
video.description = item.snippet.description;
if (item.snippet.thumbnails) {
if (item.snippet.thumbnails.medium) {
video.thumbnail = item.snippet.thumbnails.medium.url;
}
else {
video.thumbnail = item.snippet.thumbnails.default.url;
}
}
}
if (item.contentDetails) {
video.length = moment.duration(item.contentDetails.duration).asSeconds();
}
results[item.id] = video;
}
// update cache
for (const id in results) {
storage.updateVideoInfo(results[id]);
}
resolve(results);
}).catch(err => {
reject(err);
});
});
},
getVideoLengthYoutube_Fallback: async (url) => {
let res = await axios.get(url);
let regexs = [
/length_seconds":"\d+/, /lengthSeconds\\":\\"\d+/,
];
for (let r = 0; r < regexs.length; r++) {
let matches = res.data.match(regexs[r]);
if (matches == null) {
continue;
}
for (let m = 0; m < matches.length; m++) {
const match = matches[m];
let extracted = match.split(":")[1].substring(r == 0 ? 1 : 2);
console.log("MATCH", match);
console.log("EXTRACTED", extracted);
return parseInt(extracted);
}
}
return -1;
},
getPlaylistYoutube(id) {
return new Promise((resolve, reject) => {
// Unfortunately, we have to request the `snippet` part in order to get the youtube video ids
// The `id` part just gives playlistItemIds
YtApi.get(`/playlistItems?key=${process.env.YOUTUBE_API_KEY}&part=snippet&playlistId=${id}&maxResults=30`).then(res => {
if (res.status !== 200) {
reject(`Failed with status code ${res.status}`);
return;
}
let results = [];
for (let i = 0; i < res.data.items.length; i++) {
let item = res.data.items[i];
let video = {
service: "youtube",
id: item.snippet.resourceId.videoId,
title: item.snippet.title,
description: item.snippet.description,
};
if (item.snippet.thumbnails) {
if (item.snippet.thumbnails.medium) {
video.thumbnail = item.snippet.thumbnails.medium.url;
}
else {
video.thumbnail = item.snippet.thumbnails.default.url;
}
}
results.push(video);
}
// update cache
storage.updateManyVideoInfo(results).then(() => {
resolve(results);
});
}).catch(err => {
reject(err);
});
});
},
searchYoutube(query) {
return YtApi.get(`/search?key=${process.env.YOUTUBE_API_KEY}&part=id&type=video&maxResults=10&safeSearch=none&videoEmbeddable=true&videoSyndicated=true&q=${query}`).then(res => {
return res.data.items.map(searchResult => new Video({
service: "youtube",
id: searchResult.id.videoId,
}));
});
},
getAddPreview(input) {
const service = this.getService(input);
let id = null;
const urlParsed = url.parse(input.trim());
const queryParams = querystring.parse(urlParsed.query);
if (service == "youtube" && (queryParams["v"] || urlParsed.host === "youtu.be")) {
id = this.getVideoIdYoutube(input);
}
if (urlParsed.host && service !== "youtube") {
throw new UnsupportedServiceException(urlParsed.host);
}
else if (!urlParsed.host) {
if (input.length < ADD_PREVIEW_SEARCH_MIN_LENGTH) {
throw new InvalidAddPreviewInputException();
}
return this.searchYoutube(input)
.then(searchResults => this.getManyVideoInfo(searchResults))
.catch(err => {
if (err.response && err.response.status === 403) {
console.error("Failed to search youtube for add preview: Out of quota");
}
else {
console.error("Failed to search youtube for add preview:", err);
}
});
}
if (queryParams["list"]) {
// there is a playlist associated with this link
console.log("playlist found");
return new Promise((resolve, reject) => {
this.getPlaylistYoutube(queryParams["list"]).then(playlist => {
console.log(`Found ${playlist.length} videos in playlist`);
this.getManyVideoInfo(playlist).then(previews => resolve(previews));
}).catch(err => {
if (queryParams.v) {
console.warn(`Playlist does not exist, retreiving video...`);
return this.getVideoInfo(service, queryParams.v).then(video => {
resolve([video]);
}).catch(err => {
console.error("Failed to compile add preview: error getting video:", err);
reject(err);
});
}
else {
if (err.response.status === 403) {
console.error("Failed to compile add preview: error getting playlist: Out of quota");
}
else {
console.error("Failed to compile add preview: error getting playlist:", err);
}
reject(err);
}
});
});
}
else if (urlParsed.path.startsWith('/user') || urlParsed.path.startsWith('/channel')) {
console.log('channel found');
const channelData = {};
const channelId = urlParsed.path.slice(urlParsed.path.lastIndexOf('/') + 1);
if (urlParsed.path.startsWith('/channel/')) {
channelData.channel = channelId;
}
else {
channelData.user = channelId;
}
return this.getChanneInfoYoutube(channelData)
.then(newestVideos => this.getManyVideoInfo(newestVideos))
.catch(err => console.error('Error getting channel info:', err));
}
else {
let video = new Video({
service: service,
id: id,
title: id,
});
return this.getVideoInfo(video.service, video.id).then(result => {
Object.assign(video, result);
}).catch(err => {
console.error("Failed to get video info");
console.error(err);
}).then(() => {
return [video];
});
}
},
};