dtp-liberty-links/lib/site-platform.js

// site-platform.js
// Copyright (C) 2021 Digital Telepresence, LLC.
// License: Apache-2.0

'use strict';

const path = require('path');
const glob = require('glob');

const express = require('express');
const cookieParser = require('cookie-parser');
const session = require('express-session');
const RedisSessionStore = require('connect-redis')(session);
const passport = require('passport');

const mongoose = require('mongoose');
const Redis = require('ioredis');
const ioEmitter = require('socket.io-emitter');

const morgan = require('morgan');
const rfs = require('rotating-file-stream');
const compress = require('compression');
const methodOverride = require('method-override');
const marked = require('marked');

const { SiteAsync } = require(path.join(__dirname, 'site-async'));
const { SiteLog } = require(path.join(__dirname, 'site-log'));

module.connectDatabase = async (/*dtp*/) => {
  try {
    module.log.info('connecting to MongoDB database', {
      pid: process.pid,
      host: process.env.MONGODB_HOST,
      database: process.env.MONGODB_DATABASE,
    });
    const mongoConnectUri = `mongodb://${process.env.MONGODB_HOST}/${process.env.MONGODB_DATABASE}`;
    module.db = await mongoose.connect(mongoConnectUri, {
      socketTimeoutMS: 0,
      keepAlive: true,
      keepAliveInitialDelay: 300000,
      dbName: process.env.MONGODB_DATABASE,
    });
    module.log.info('connected to MongoDB');
  } catch (error) {
    module.log.error('failed to connect to database', { error });
    throw error;
  }
};


module.loadModels = async (dtp) => {
  dtp.models = module.models = [ ];
  const modelScripts = glob.sync(path.join(dtp.config.root, 'app', 'models', '*.js'));
  modelScripts.forEach((modelScript) => {
    const model = require(modelScript);
    if (module.models[model.modelName]) {
      module.log.error('model name collision', { name: model.modelName });
      process.exit(-1);
    }
    module.models[model.modelName] = model;
  });
};

module.connectRedis = async (dtp) => {
  try {
    const options = {
      host: process.env.REDIS_HOST,
      port: parseInt(process.env.REDIS_PORT || '6379', 10),
      password: process.env.REDIS_PASSWORD,
      keyPrefix: process.env.REDIS_KEY_PREFIX,
      lazyConnect: true,
    };
    module.log.info('connecting to Redis', {
      host: options.host,
      port: options.port,
      prefix: options.keyPrefix,
    });

    module.redis = dtp.redis = new Redis(options);
    module.redis.setMaxListeners(64); // prevents warnings/errors with Bull Queue

    await module.redis.connect();
    module.ioEmitter = dtp.ioEmitter = ioEmitter(module.redis);

    module.log.info('Redis connected');
  } catch (error) {
    module.log.error('failed to connect to Redis', error);
    throw error;
  }
};

module.getRedisKeys = (pattern) => {
  return new Promise((resolve, reject) => {
    return module.redis.keys(pattern, (err, response) => {
      if (err) {
        return reject(err);
      }
      return resolve(response);
    });
  });
};

module.loadServices = async (dtp) => {
  dtp.services = module.services = { };
  const scripts = glob.sync(path.join(dtp.config.root, 'app', 'services', '*.js'));
  const inits = [ ];
  await SiteAsync.each(scripts, async (script) => {
    const service = await require(script);
    module.services[service.name] = service.create(dtp);
    module.services[service.name].__dtp_service_name = service.name;
    inits.push(module.services[service.name]);
  });
  await SiteAsync.each(inits, async (service) => {
    await service.start();
  });
};

module.loadControllers = async (dtp) => {
  const scripts = glob.sync(path.join(dtp.config.root, 'app', 'controllers', '*.js'));
  const inits = [ ];

  dtp.controllers = { };

  await SiteAsync.each(scripts, async (script) => {
    const controller = await require(script);
    controller.instance = await controller.create(dtp);
    
    dtp.controllers[controller.name] = controller;

    inits.push(controller);
  });

  await SiteAsync.each(inits, async (controller) => {
    if (controller.isHome) {
      return; // must run last
    }
    await controller.instance.start();
  });

  /*
   * Start the Home controller
   */
  await dtp.controllers.home.instance.start();

  /*
   * Default error handler
   */
  module.log.info('registering ExpressJS error handler');
  dtp.app.use((error, req, res, next) => { // jshint ignore:line
    res.locals.errorCode = error.statusCode || error.status || error.code || 500;
    module.log.error('ExpressJS error', { url: req.url, error });
    res.status(res.locals.errorCode).render('error', {
      message: error.message,
      error,
      errorCode: res.locals.errorCode,
    });
    // return next(error);
  });
};

module.exports.startPlatform = async (dtp) => {
  try {

    module.log = new SiteLog(module, dtp.config.componentName);
    dtp.config.jobQueues = require(path.join(dtp.config.root, 'config', 'job-queues'));

    await module.connectDatabase(dtp);
    await module.connectRedis(dtp);

    await module.loadModels(dtp);
    SiteLog.setModel(mongoose.model('Log'));

    await module.loadServices(dtp);
  } catch (error) {
    module.log.error('failed to initialize the Digital Telepresence Platform', { error });
    return;
  }
};

module.exports.startWebServer = async (dtp) => {
  dtp.app = module.app = express();

  module.app.set('views', path.join(dtp.config.root, 'app', 'views'));
  module.app.set('view engine', 'pug');
  module.app.set('x-powered-by', false);

  /*
   * Expose useful modules and information
   */
  module.app.locals.DTP_SCRIPT_DEBUG = (process.env.NODE_ENV === 'local');
  module.app.locals.pkg = require(path.join(dtp.config.root, 'package.json'));
  module.app.locals.moment = require('moment');
  module.app.locals.numeral = require('numeral');
  module.app.locals.phoneNumberJS = require('libphonenumber-js');
  module.app.locals.anchorme = require('anchorme').default;
  
  /*
   * Set up the protected markdown renderer that will refuse to process links and images
   * for security reasons.
   */
  var markedRenderer = new marked.Renderer();
  markedRenderer.link = (href, title, text) => { return text; };
  markedRenderer.image = (href, title, text) => { return text; };
  marked.setOptions({ renderer: markedRenderer });
  module.app.locals.marked = marked;

  /*
   * HTTP request logging
   */
  if (process.env.DTP_LOG_FILE === 'enabled') {
    const httpLogStream = rfs.createStream(process.env.DTP_LOG_FILE_NAME_HTTP || 'dtp-sites-access.log', {
      interval: '1d',
      path: process.env.DTP_LOG_FILE_PATH || '/tmp',
      compress: 'gzip',
    });
    module.app.use(morgan(process.env.DTP_LOG_HTTP_FORMAT || 'combined', { stream: httpLogStream }));
  }

  function cacheOneDay (req, res, next) {
    res.set('Cache-Control', 's-maxage=86400');
    return next();
  }

  /*
   * Static file services (project)
   */
  module.app.use(express.static(path.join(dtp.config.root, 'client')));
  module.app.use('/dist', cacheOneDay, express.static(path.join(dtp.config.root, 'dist')));
  module.app.use('/img', cacheOneDay, express.static(path.join(dtp.config.root, 'client', 'img')));

  /*
   * Static file services (vendor)
   */
  module.app.use('/uikit', cacheOneDay, express.static(path.join(dtp.config.root, 'node_modules', 'uikit', 'dist')));
  module.app.use('/chart.js', cacheOneDay, express.static(path.join(dtp.config.root, 'node_modules', 'chart.js', 'dist')));
  module.app.use('/chartjs-adapter-moment', cacheOneDay, express.static(path.join(dtp.config.root, 'node_modules', 'chartjs-adapter-moment', 'dist')));
  module.app.use('/cropperjs', cacheOneDay, express.static(path.join(dtp.config.root, 'node_modules', 'cropperjs', 'dist')));
  module.app.use('/fontawesome', cacheOneDay, express.static(path.join(dtp.config.root, 'node_modules', '@fortawesome', 'fontawesome-free')));
  module.app.use('/moment', cacheOneDay, express.static(path.join(dtp.config.root, 'node_modules', 'moment', 'min')));
  module.app.use('/mpegts', cacheOneDay, express.static(path.join(dtp.config.root, 'node_modules', 'mpegts.js', 'dist')));
  module.app.use('/numeral', cacheOneDay, express.static(path.join(dtp.config.root, 'node_modules', 'numeral', 'min')));
  module.app.use('/tinymce', cacheOneDay, express.static(path.join(dtp.config.root, 'node_modules', 'tinymce')));

  /*
   * ExpressJS middleware
   */
  module.app.use(express.json({ }));
  module.app.use(express.urlencoded({ extended: true }));
  module.app.use(cookieParser());
  module.app.use(compress());
  module.app.use(methodOverride());

  /*
   * Express sessions
   */
  module.log.info('initializing redis session store');
  var sessionStore = new RedisSessionStore({ client: module.redis });

  const SESSION_DURATION = 1000 * 60 * 60 * 24 * 30; // 30 days
  module.sessionConfig = {
    name: `session.${process.env.DTP_SITE_DOMAIN_KEY}.${process.env.NODE_ENV}`,
    secret: process.env.HTTP_SESSION_SECRET,
    resave: true,
    saveUninitialized: true,
    cookie: {
      domain: process.env.DTP_SITE_DOMAIN,
      path: '/',
      httpOnly: true,
      secure: false,
      sameSite: 'strict',
      expires: SESSION_DURATION,
    },
    store: null,
  };
  module.sessionConfig.store = sessionStore;
  if (process.env.NODE_ENV === 'production') {
    module.app.set('trust proxy', 1);
    // module.sessionConfig.cookie.secure = true;
  }
  module.app.use(session(module.sessionConfig));

  /*
   * PassportJS setup
   */
  module.log.info('initializting PassportJS');
  module.app.use(passport.initialize());
  module.app.use(passport.session());

  module.app.use(module.services.session.middleware());

  /*
   * Application logic middleware
   */
  module.app.use(async (req, res, next) => {
    const { cache: cacheService } = dtp.services;
    try {
      res.locals.dtp = {
        request: req,
      };
      res.locals.socialIcons = [
        {
          url: 'https://facebook.com',
          label: 'Facebook',
          icon: 'fa-facebook'
        },
        {
          url: 'https://twitter.com',
          label: 'Twitter',
          icon: 'fa-twitter'
        },
        {
          url: 'https://instagram.com',
          label: 'Instagram',
          icon: 'fa-instagram'
        },
      ];

      const settingsKey = `settings:${dtp.config.site.domainKey}:site`;
      res.locals.site = dtp.config.site;

      const settings = await cacheService.getObject(settingsKey);
      if (settings) {
        res.locals.site = Object.assign(res.locals.site, settings);
      }
      return next();
    } catch (error) {
      module.log.error('failed to populate general request data', { error });
      return next(error);
    }
  });

  /*
   * System Init
   */
  try {
    await module.loadControllers(dtp);
  } catch (error) {
    module.log.error('failed to initialize application controller', { error });
    return;
  }

  module.log.info('creating HTTP server');
  module.http = require('http').createServer(module.app);

  module.log.info('creating Socket.io server');
  const { SiteIoServer } = require(path.join(__dirname, 'site-ioserver'));
  module.io = new SiteIoServer(dtp);
  await module.io.start(module.http);

  module.log.info('starting HTTP server', {
    port: dtp.config.http.port,
    bind: dtp.config.http.address,
  });
  module.http.listen(dtp.config.http.port, dtp.config.http.address, ( ) => {
    module.log.info(`${dtp.config.componentName} platform online`, { port: dtp.config.http.port });
  });
};

module.exports.shutdown = async ( ) => {
  module.log.info('platform shutting down');
};