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index.js
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index.js
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const express = require('express');
const bodyParser = require('body-parser');
const {google} = require('googleapis');
const isoDuration = require('iso8601-duration')
const app = express();
const youtube = google.youtube('v3');
const API_KEY = 'AIzaSyBd6Db7sSjJXHj21-t4Dyp2gAE217UKQQA';
app.use(express.static('public'));
app.use(bodyParser.urlencoded({extended: true}));
app.set('view engine', 'ejs');
app.get('/', function (req, res) {
res.render('index', {});
});
app.listen(3000, function () {
console.log('App listening on port 3000!')
});
app.post('/', function (req, res) {
getChannel(req.body.channelId, function (channel) {
if (channel === null) {
res.render('index', {error: "Channel doesn't exist."});
return;
}
let channelTitle = channel['snippet']['title'];
let uploadsPlaylist = channel['contentDetails']['relatedPlaylists']['uploads'];
let videos = [];
getPlaylistVideos(null, uploadsPlaylist, videos, function (videoIds) {
getVideoLengths(videoIds, function (videoLengths) {
let totalSeconds = 0;
videoLengths.forEach(function (videoLength) {
totalSeconds += isoDuration.toSeconds(isoDuration.parse(videoLength));
});
let totalTime = secondsToTime(totalSeconds);
let timeUnits = ['years', 'months', 'days', 'hours', 'minutes', 'seconds'];
let timeText = '';
let lastUnit = null;
let secondToLastUnit = null;
for (let i = 0; i < 6; i++)
if (totalTime[i] > 0) {
secondToLastUnit = lastUnit;
lastUnit = i;
}
for (let i = 0; i < 6; i++) {
if (totalTime[i] > 0) {
timeText += totalTime[i] + ' ' + (totalTime[i] > 1 ? timeUnits[i] : timeUnits[i].slice(0, -1));
if (i === secondToLastUnit)
timeText += ' and ';
else if (i !== lastUnit)
timeText += ', ';
}
}
res.render('index', {
time: timeText,
title: channelTitle,
url: 'https://www.youtube.com/playlist?list=' + uploadsPlaylist
});
});
})
});
});
function secondsToTime(seconds) {
let ret = [0, 0, 0, 0, 0];
for (let t of [31557600, 2629800, 86400, 3600, 60].entries()) {
if (seconds >= t[1]) {
ret[t[0]] += Math.floor(seconds / t[1]);
seconds -= Math.floor(seconds / t[1]) * t[1];
}
}
ret.push(Math.floor(seconds));
return ret;
}
function getChannel(channelId, callback) {
youtube.channels.list({
'id': channelId,
'part': 'snippet,contentDetails',
'key': API_KEY
}, function (err, response) {
if (response.data['pageInfo']['totalResults'] === 0) {
youtube.channels.list({
'forUsername': channelId,
'part': 'snippet,contentDetails',
'key': API_KEY
}, function (err, response) {
if (response.data['pageInfo']['totalResults'] === 0)
callback(null);
else
callback(response.data['items'][0]);
});
}
else
callback(response.data['items'][0]);
});
}
function getPlaylistVideos(token, playlistId, videoIds, callback) {
youtube.playlistItems.list({
'playlistId': playlistId,
'part': 'snippet',
'maxResults': 50,
'pageToken': token == null ? '' : token,
'key': API_KEY
}, function (err, response) {
videoIds.push(...response.data['items'].map(_ => _['snippet']['resourceId']['videoId']));
if ('nextPageToken' in response.data)
getPlaylistVideos(response.data['nextPageToken'], playlistId, videoIds, callback);
else
callback(videoIds);
});
}
function getVideoLengths(videoIds, callback) {
let lengths = [];
let c = 0;
for (let i = 0; i < videoIds.length; i += 50) {
c++;
youtube.videos.list({
'part': 'contentDetails',
'id': videoIds.slice(i, i + 50).join(','),
'key': API_KEY
}, function (err, response) {
lengths.push(...response.data['items'].map(_ => _['contentDetails']['duration']));
c--;
if (c === 0)
callback(lengths);
});
}
}