Meet App

An AWS Lambda function creates the Google sign-in link, so no traditional server is needed.

// AWS Lambda function for Google Calendar API authorization
const { google } = require('googleapis');

exports.handler = async (event) => {
  const oAuth2Client = new google.auth.OAuth2(
    process.env.CLIENT_ID,
    process.env.CLIENT_SECRET,
    process.env.REDIRECT_URI
  );
  const authUrl = oAuth2Client.generateAuthUrl({
    access_type: 'offline',
    scope: ['https://www.googleapis.com/auth/calendar.readonly'],
  });
  return {
    statusCode: 200,
    headers: {
      'Access-Control-Allow-Origin': '*',
      'Access-Control-Allow-Credentials': true,
    },
    body: JSON.stringify({ authUrl: authUrl }),
  };
};

A service worker caches the app's core files so it keeps working without a connection.

// Service worker for offline functionality
const CACHE_NAME = 'meet-app-v1';
const urlsToCache = [
  '/',
  '/static/js/bundle.js',
  '/static/css/main.css',
  '/manifest.json'
];

self.addEventListener('install', function (event) {
  event.waitUntil(
    caches.open(CACHE_NAME).then(function (cache) {
      return cache.addAll(urlsToCache);
    })
  );
});

self.addEventListener('fetch', function (event) {
  event.respondWith(
    caches.match(event.request).then(function (response) {
      return response || fetch(event.request);
    })
  );
});