Automating My YouTube Uploads Using Node.js

// YouTube API video uploader using JavaScript/Node.js
// You can find the full visual guide at: https://www.youtube.com/watch?v=gncPwSEzq1s
// You can find the brief written guide at: https://quanticdev.com/articles/automating-my-youtube-uploads-using-nodejs
//
// Upload code is adapted from: https://developers.google.com/youtube/v3/quickstart/nodejs

const fs = require('fs');
const readline = require('readline');
const assert = require('assert')
const {google} = require('googleapis');
const OAuth2 = google.auth.OAuth2;

// video category IDs for YouTube:
const categoryIds = {
  Entertainment: 24,
  Education: 27,
  ScienceTechnology: 28
}

// If modifying these scopes, delete your previously saved credentials in client_oauth_token.json
const SCOPES = ['https://www.googleapis.com/auth/youtube.upload'];
const TOKEN_PATH = '../' + 'client_oauth_token.json';

const videoFilePath = '../vid.mp4'
const thumbFilePath = '../thumb.png'

exports.uploadVideo = (title, description, tags) => {
  assert(fs.existsSync(videoFilePath))
  assert(fs.existsSync(thumbFilePath))

  // Load client secrets from a local file.
  fs.readFile('../client_secret.json', function processClientSecrets(err, content) {
    if (err) {
      console.log('Error loading client secret file: ' + err);
      return;
    }
    // Authorize a client with the loaded credentials, then call the YouTube API.
    authorize(JSON.parse(content), (auth) => uploadVideo(auth, title, description, tags));
  });
}

/**
 * Upload the video file.
 *
 * @param {google.auth.OAuth2} auth An authorized OAuth2 client.
 */
function uploadVideo(auth, title, description, tags) {
  const service = google.youtube('v3')

  service.videos.insert({
    auth: auth,
    part: 'snippet,status',
    requestBody: {
      snippet: {
        title,
        description,
        tags,
        categoryId: categoryIds.ScienceTechnology,
        defaultLanguage: 'en',
        defaultAudioLanguage: 'en'
      },
      status: {
        privacyStatus: "private"
      },
    },
    media: {
      body: fs.createReadStream(videoFilePath),
    },
  }, function(err, response) {
    if (err) {
      console.log('The API returned an error: ' + err);
      return;
    }
    console.log(response.data)

    console.log('Video uploaded. Uploading the thumbnail now.')
    service.thumbnails.set({
      auth: auth,
      videoId: response.data.id,
      media: {
        body: fs.createReadStream(thumbFilePath)
      },
    }, function(err, response) {
      if (err) {
        console.log('The API returned an error: ' + err);
        return;
      }
      console.log(response.data)
    })
  });
}

/**
 * Create an OAuth2 client with the given credentials, and then execute the
 * given callback function.
 *
 * @param {Object} credentials The authorization client credentials.
 * @param {function} callback The callback to call with the authorized client.
 */
function authorize(credentials, callback) {
  const clientSecret = credentials.installed.client_secret;
  const clientId = credentials.installed.client_id;
  const redirectUrl = credentials.installed.redirect_uris[0];
  const oauth2Client = new OAuth2(clientId, clientSecret, redirectUrl);

  // Check if we have previously stored a token.
  fs.readFile(TOKEN_PATH, function(err, token) {
    if (err) {
      getNewToken(oauth2Client, callback);
    } else {
      oauth2Client.credentials = JSON.parse(token);
      callback(oauth2Client);
    }
  });
}

/**
 * Get and store new token after prompting for user authorization, and then
 * execute the given callback with the authorized OAuth2 client.
 *
 * @param {google.auth.OAuth2} oauth2Client The OAuth2 client to get token for.
 * @param {getEventsCallback} callback The callback to call with the authorized
 *     client.
 */
function getNewToken(oauth2Client, callback) {
  const authUrl = oauth2Client.generateAuthUrl({
    access_type: 'offline',
    scope: SCOPES
  });
  console.log('Authorize this app by visiting this url: ', authUrl);
  const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
  });
  rl.question('Enter the code from that page here: ', function(code) {
    rl.close();
    oauth2Client.getToken(code, function(err, token) {
      if (err) {
        console.log('Error while trying to retrieve access token', err);
        return;
      }
      oauth2Client.credentials = token;
      storeToken(token);
      callback(oauth2Client);
    });
  });
}

/**
 * Store token to disk be used in later program executions.
 *
 * @param {Object} token The token to store to disk.
 */
function storeToken(token) {
  fs.writeFile(TOKEN_PATH, JSON.stringify(token), (err) => {
    if (err) throw err;
    console.log('Token stored to ' + TOKEN_PATH);
  });
}