Making gmail push notifications to webhook

main.ts

import * as request from 'request';
import * as fs from 'fs';
import * as readline from 'readline';
var google = require('googleapis');
var googleAuth = require('google-auth-library');

/*************** STEPS

- made a project on https://console.cloud.google.com/cloudpubsub/topicList?project=testmabs thing?
- made a pubsub topic
- made a subscription to the webhook url
- added that url to the sites i own, i guess? I think I had to do DNS things to confirm i own it, and the error was super vague to figure out that was what i had to do, when trying to add the subscription
- added permission to the topic for "gmail-api-push@system.gserviceaccount.com" as publisher (I also added ....apps.googleusercontent.com and youtrackapiuser.caps@gmail.com but i dont think I needed them)
- created oauth client info and downloaded it in the credentials section of the google console. (oauthtrash.json)


****************/

var SCOPES = [
  'https://mail.google.com/',
  'https://www.googleapis.com/auth/gmail.modify',
  'https://www.googleapis.com/auth/gmail.readonly'
];
var TOKEN_DIR = './.credentials/';
var TOKEN_PATH = TOKEN_DIR + 'gmail-nodejs-fun.json';

var key = require('../config/oauthtrash.json');
authorize(key, (auth) => {
  listLabels(auth);
  listEmails(auth);
  //watchEmails(auth);
});

// https://developers.google.com/gmail/api/quickstart/nodejs#step_2_install_the_client_library
function authorize(credentials, cb) {
  var clientSecret = credentials.installed.client_secret;
  var clientId = credentials.installed.client_id;
  var redirectUrl = credentials.installed.redirect_uris[0];
  var auth = new googleAuth();

  var authClient = new auth.OAuth2(clientId, clientSecret, redirectUrl);
  //var authClient = new google.auth.JWT(key.client_email, null, key.private_key, SCOPES, null);

  // authClient.authorize((err, tokens) => {
  //   if(err) return console.log(err);
  //   //cb(authClient);
  //   console.log(authClient);
  // });

  //Check if we have previously stored a token.
  fs.readFile(TOKEN_PATH, function(err, token) {
    if (err) {
      getNewToken(authClient, cb);
    } else {
      authClient.credentials = JSON.parse(token.toString());
      cb(authClient);
    }
  });
}
function getNewToken(oauth2Client, callback) {
  var authUrl = oauth2Client.generateAuthUrl({
    access_type: 'offline',
    scope: SCOPES
  });
  console.log('Authorize this app by visiting this url: ', authUrl);
  var 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);
    });
  });
}
function storeToken(token) {
  try {
    fs.mkdirSync(TOKEN_DIR);
  } catch (err) {
    if (err.code != 'EEXIST') {
      throw err;
    }
  }
  fs.writeFile(TOKEN_PATH, JSON.stringify(token));
  console.log('Token stored to ' + TOKEN_PATH);
}



function listLabels(auth) {
  var gmail = google.gmail('v1');
  gmail.users.labels.list({
    auth: auth,
    userId: 'me',
  }, function(err, response) {
    if (err) {
      console.log('The API returned an error: ' + err);
      return;
    }
    var labels = response.labels;
    if (labels.length == 0) {
      console.log('No labels found.');
    } else {
      console.log('Labels:');
      for (var i = 0; i < labels.length; i++) {
        var label = labels[i];
        console.log('- %s', label.name);
      }
    }
  });
}

function listEmails(auth) {
  var gmail = google.gmail({ auth: auth, version: 'v1' });

  var emails = gmail.users.history.list({
      //maxResults: 5,
      startHistoryId: 1392, //1401,
      userId: "youtrackapiuser.caps@gmail.com"
  }, function (err, results) {
      // https://developers.google.com/gmail/api/v1/reference/users/history/list#response
      if(err) return console.log(err);
      console.log("users.history.list result:", results);
      //console.log("-----------------------");
      if(!results.history || !results.history.length) console.log("No history");

      results.history[0].messages.map((emailInfo, i) => {
        gmail.users.messages.get({ userId: "youtrackapiuser.caps@gmail.com", id: emailInfo.id }, (err, results) => {
          if(err) return console.log(err);
          console.log(`Email ${i} (${emailInfo.id}):`, results);
          if(i == 0){
            //console.log("----------------------");
            //console.log(JSON.stringify(results, null, 2));
          }
        });
      });
  });

  // var emails = gmail.users.messages.list({
  //     includeSpamTrash: false,
  //     //maxResults: 5,
  //     startHistoryId: 1401,
  //     q: "",
  //     userId: "youtrackapiuser.caps@gmail.com"
  // }, function (err, results) {
  //     if(err) return console.log(err);
  //     console.log(results);
  //     //console.log("-----------------------");
  //     results.messages.map((emailInfo, i) => {
  //       gmail.users.messages.get({ userId: "youtrackapiuser.caps@gmail.com", id: emailInfo.id }, (err, results) => {
  //         if(err) return console.log(err);
  //         console.log(`Email ${i} (${emailInfo.id}):`, results);
  //         if(i == 0){
  //           //console.log("----------------------");
  //           //console.log(JSON.stringify(results, null, 2));
  //         }
  //       });
  //     });
  // });
}

function watchEmails(auth) {
  // https://developers.google.com/gmail/api/guides/push#create_a_topic
  var gmail = google.gmail({ auth: auth, version: 'v1' });

  gmail.users.watch({
    userId: "youtrackapiuser.caps@gmail.com",
    resource: {
      topicName: "projects/testmabs/topics/testpusho",
    }
  }, (err, result) => {
    console.log("Error:", err);
    console.log("Watch reply:", result);
  })
}