server.js

/*
 * Copyright (c) 2014-2020 Bjoern Kimminich.
 * SPDX-License-Identifier: MIT
 */

const path = require('path')
const fs = require('fs-extra')
const morgan = require('morgan')
const colors = require('colors/safe')
const finale = require('finale-rest')
const express = require('express')
const compression = require('compression')
const helmet = require('helmet')
const errorhandler = require('errorhandler')
const cookieParser = require('cookie-parser')
const serveIndex = require('serve-index')
const bodyParser = require('body-parser')
const cors = require('cors')
const securityTxt = require('express-security.txt')
const robots = require('express-robots-txt')
const yaml = require('js-yaml')
const swaggerUi = require('swagger-ui-express')
const RateLimit = require('express-rate-limit')
const swaggerDocument = yaml.load(fs.readFileSync('./swagger.yml', 'utf8'))
const {
  ensureFileIsPassed,
  handleZipFileUpload,
  checkUploadSize,
  checkFileType,
  handleXmlUpload
} = require('./routes/fileUpload')
const profileImageFileUpload = require('./routes/profileImageFileUpload')
const profileImageUrlUpload = require('./routes/profileImageUrlUpload')
const redirect = require('./routes/redirect')
const angular = require('./routes/angular')
const easterEgg = require('./routes/easterEgg')
const premiumReward = require('./routes/premiumReward')
const privacyPolicyProof = require('./routes/privacyPolicyProof')
const appVersion = require('./routes/appVersion')
const repeatNotification = require('./routes/repeatNotification')
const continueCode = require('./routes/continueCode')
const restoreProgress = require('./routes/restoreProgress')
const fileServer = require('./routes/fileServer')
const quarantineServer = require('./routes/quarantineServer')
const keyServer = require('./routes/keyServer')
const logFileServer = require('./routes/logfileServer')
const metrics = require('./routes/metrics')
const authenticatedUsers = require('./routes/authenticatedUsers')
const currentUser = require('./routes/currentUser')
const login = require('./routes/login')
const changePassword = require('./routes/changePassword')
const resetPassword = require('./routes/resetPassword')
const securityQuestion = require('./routes/securityQuestion')
const search = require('./routes/search')
const coupon = require('./routes/coupon')
const basket = require('./routes/basket')
const order = require('./routes/order')
const verify = require('./routes/verify')
const recycles = require('./routes/recycles')
const b2bOrder = require('./routes/b2bOrder')
const showProductReviews = require('./routes/showProductReviews')
const createProductReviews = require('./routes/createProductReviews')
const updateProductReviews = require('./routes/updateProductReviews')
const likeProductReviews = require('./routes/likeProductReviews')
const logger = require('./lib/logger')
const utils = require('./lib/utils')
const insecurity = require('./lib/insecurity')
const models = require('./models')
const datacreator = require('./data/datacreator')
const app = express()
const server = require('http').Server(app)
const appConfiguration = require('./routes/appConfiguration')
const captcha = require('./routes/captcha')
const trackOrder = require('./routes/trackOrder')
const countryMapping = require('./routes/countryMapping')
const basketItems = require('./routes/basketItems')
const saveLoginIp = require('./routes/saveLoginIp')
const userProfile = require('./routes/userProfile')
const updateUserProfile = require('./routes/updateUserProfile')
const videoHandler = require('./routes/videoHandler')
const twoFactorAuth = require('./routes/2fa')
const languageList = require('./routes/languages')
const config = require('config')
const imageCaptcha = require('./routes/imageCaptcha')
const dataExport = require('./routes/dataExport')
const address = require('./routes/address')
const erasureRequest = require('./routes/erasureRequest')
const payment = require('./routes/payment')
const wallet = require('./routes/wallet')
const orderHistory = require('./routes/orderHistory')
const delivery = require('./routes/delivery')
const deluxe = require('./routes/deluxe')
const memory = require('./routes/memory')
const locales = require('./data/static/locales')
const i18n = require('i18n')

require('./lib/startup/restoreOverwrittenFilesWithOriginals')()
require('./lib/startup/cleanupFtpFolder')()
require('./lib/startup/validatePreconditions')()
require('./lib/startup/validateConfig')()

const multer = require('multer')
const uploadToMemory = multer({ storage: multer.memoryStorage(), limits: { fileSize: 200000 } })
const mimeTypeMap = {
  'image/png': 'png',
  'image/jpeg': 'jpg',
  'image/jpg': 'jpg'
}
const uploadToDisk = multer({
  storage: multer.diskStorage({
    destination: (req, file, cb) => {
      const isValid = mimeTypeMap[file.mimetype]
      let error = new Error('Invalid mime type')
      if (isValid) {
        error = null
      }
      cb(error, './frontend/dist/frontend/assets/public/images/uploads/')
    },
    filename: (req, file, cb) => {
      const name = insecurity.sanitizeFilename(file.originalname)
        .toLowerCase()
        .split(' ')
        .join('-')
      const ext = mimeTypeMap[file.mimetype]
      cb(null, name + '-' + Date.now() + '.' + ext)
    }
  })
})

errorhandler.title = `${config.get('application.name')} (Express ${utils.version('express')})`

/* Locals */
app.locals.captchaId = 0
app.locals.captchaReqId = 1
app.locals.captchaBypassReqTimes = []
app.locals.abused_ssti_bug = false
app.locals.abused_ssrf_bug = false

/* Compression for all requests */
app.use(compression())

/* Bludgeon solution for possible CORS problems: Allow everything! */
app.options('*', cors())
app.use(cors())

/* Security middleware */
app.use(helmet.noSniff())
app.use(helmet.frameguard())
// app.use(helmet.xssFilter()); // = no protection from persisted XSS via RESTful API
app.disable('x-powered-by')
app.use(helmet.featurePolicy({
  features: {
    payment: ["'self'"]
  }
}))

/* Remove duplicate slashes from URL which allowed bypassing subsequent filters */
app.use((req, res, next) => {
  req.url = req.url.replace(/[/]+/g, '/')
  next()
})

/* Increase request counter metric for every request */
app.use(metrics.observeRequestMetricsMiddleware())

/* Security Policy */
app.get('/.well-known/security.txt', verify.accessControlChallenges())
app.use('/.well-known/security.txt', securityTxt({
  contact: config.get('application.securityTxt.contact'),
  encryption: config.get('application.securityTxt.encryption'),
  acknowledgements: config.get('application.securityTxt.acknowledgements')
}))

/* robots.txt */
app.use(robots({ UserAgent: '*', Disallow: '/ftp' }))

/* Checks for challenges solved by retrieving a file implicitly or explicitly */
app.use('/assets/public/images/padding', verify.accessControlChallenges())
app.use('/assets/public/images/products', verify.accessControlChallenges())
app.use('/assets/public/images/uploads', verify.accessControlChallenges())
app.use('/assets/i18n', verify.accessControlChallenges())

/* Checks for challenges solved by abusing SSTi and SSRF bugs */
app.use('/solve/challenges/server-side', verify.serverSideChallenges())

/* Create middleware to change paths from the serve-index plugin from absolute to relative */
const serveIndexMiddleware = (req, res, next) => {
  const origEnd = res.end
  res.end = function () {
    if (arguments.length) {
      const reqPath = req.originalUrl.replace(/\?.*$/, '')
      const currentFolder = reqPath.split('/').pop()
      arguments[0] = arguments[0].replace(/a href="([^"]+?)"/gi, function (matchString, matchedUrl) {
        let relativePath = path.relative(reqPath, matchedUrl)
        if (relativePath === '') {
          relativePath = currentFolder
        } else if (!relativePath.startsWith('.') && currentFolder !== '') {
          relativePath = currentFolder + '/' + relativePath
        } else {
          relativePath = relativePath.replace('..', '.')
        }
        return 'a href="' + relativePath + '"'
      })
    }
    origEnd.apply(this, arguments)
  }
  next()
}

/* /ftp directory browsing and file download */
app.use('/ftp', serveIndexMiddleware, serveIndex('ftp', { icons: true }))
app.use('/ftp(?!/quarantine)/:file', fileServer())
app.use('/ftp/quarantine/:file', quarantineServer())

/* /encryptionkeys directory browsing */
app.use('/encryptionkeys', serveIndexMiddleware, serveIndex('encryptionkeys', { icons: true, view: 'details' }))
app.use('/encryptionkeys/:file', keyServer())

/* /logs directory browsing */
app.use('/support/logs', serveIndexMiddleware, serveIndex('logs', { icons: true, view: 'details' }))
app.use('/support/logs', verify.accessControlChallenges())
app.use('/support/logs/:file', logFileServer())

/* Swagger documentation for B2B v2 endpoints */
app.use('/api-docs', swaggerUi.serve, swaggerUi.setup(swaggerDocument))

app.use(express.static(path.join(__dirname, '/frontend/dist/frontend')))
app.use(cookieParser('kekse'))

/* Configure and enable backend-side i18n */
i18n.configure({
  locales: locales.map(locale => locale.key),
  directory: path.join(__dirname, '/i18n'),
  cookie: 'language',
  defaultLocale: 'en',
  autoReload: true
})
app.use(i18n.init)

app.use(bodyParser.urlencoded({ extended: true }))
/* File Upload */
app.post('/file-upload', uploadToMemory.single('file'), ensureFileIsPassed, metrics.observeFileUploadMetricsMiddleware(), handleZipFileUpload, checkUploadSize, checkFileType, handleXmlUpload)
app.post('/profile/image/file', uploadToMemory.single('file'), ensureFileIsPassed, metrics.observeFileUploadMetricsMiddleware(), profileImageFileUpload())
app.post('/profile/image/url', uploadToMemory.single('file'), profileImageUrlUpload())
app.post('/rest/memories', uploadToDisk.single('image'), ensureFileIsPassed, insecurity.appendUserId(), metrics.observeFileUploadMetricsMiddleware(), memory.addMemory())

app.use(bodyParser.text({ type: '*/*' }))
app.use(function jsonParser (req, res, next) {
  req.rawBody = req.body
  if (req.headers['content-type'] !== undefined && req.headers['content-type'].indexOf('application/json') > -1) {
    if (req.body && req.body !== Object(req.body)) { // Expensive workaround for 500 errors during Frisby test run (see #640)
      req.body = JSON.parse(req.body)
    }
  }
  next()
})
/* HTTP request logging */
const accessLogStream = require('file-stream-rotator').getStream({
  filename: './logs/access.log',
  frequency: 'daily',
  verbose: false,
  max_logs: '2d'
})
app.use(morgan('combined', { stream: accessLogStream }))

/* Rate limiting */
app.enable('trust proxy')
app.use('/rest/user/reset-password', new RateLimit({
  windowMs: 5 * 60 * 1000,
  max: 100,
  keyGenerator ({ headers, ip }) { return headers['X-Forwarded-For'] || ip },
  delayMs: 0
}))

/** Authorization **/
/* Checks on JWT in Authorization header */
app.use(verify.jwtChallenges())
/* Baskets: Unauthorized users are not allowed to access baskets */
app.use('/rest/basket', insecurity.isAuthorized(), insecurity.appendUserId())
/* BasketItems: API only accessible for authenticated users */
app.use('/api/BasketItems', insecurity.isAuthorized())
app.use('/api/BasketItems/:id', insecurity.isAuthorized())
/* Feedbacks: GET allowed for feedback carousel, POST allowed in order to provide feedback without being logged in */
app.use('/api/Feedbacks/:id', insecurity.isAuthorized())
/* Users: Only POST is allowed in order to register a new user */
app.get('/api/Users', insecurity.isAuthorized())
app.route('/api/Users/:id')
  .get(insecurity.isAuthorized())
  .put(insecurity.denyAll()) // Updating users is forbidden to make the password change challenge harder
  .delete(insecurity.denyAll()) // Deleting users is forbidden entirely to keep login challenges solvable
/* Products: Only GET is allowed in order to view products */
app.post('/api/Products', insecurity.isAuthorized())
// app.put('/api/Products/:id', insecurity.isAuthorized()); // = missing function-level access control vulnerability
app.delete('/api/Products/:id', insecurity.denyAll()) // Deleting products is forbidden entirely to keep the O-Saft url-change challenge solvable
/* Challenges: GET list of challenges allowed. Everything else forbidden independent of authorization (hence the random secret) */
app.post('/api/Challenges', insecurity.denyAll())
app.use('/api/Challenges/:id', insecurity.denyAll())
/* Complaints: POST and GET allowed when logged in only */
app.get('/api/Complaints', insecurity.isAuthorized())
app.post('/api/Complaints', insecurity.isAuthorized())
app.use('/api/Complaints/:id', insecurity.denyAll())
/* Recycles: POST and GET allowed when logged in only */
app.get('/api/Recycles', recycles.blockRecycleItems())
app.post('/api/Recycles', insecurity.isAuthorized())
/* Challenge evaluation before finale takes over */
app.get('/api/Recycles/:id', recycles.sequelizeVulnerabilityChallenge())
app.put('/api/Recycles/:id', insecurity.denyAll())
app.delete('/api/Recycles/:id', insecurity.denyAll())
/* SecurityQuestions: Only GET list of questions allowed. */
app.post('/api/SecurityQuestions', insecurity.denyAll())
app.use('/api/SecurityQuestions/:id', insecurity.denyAll())
/* SecurityAnswers: Only POST of answer allowed. */
app.get('/api/SecurityAnswers', insecurity.denyAll())
app.use('/api/SecurityAnswers/:id', insecurity.denyAll())
/* REST API */
app.use('/rest/user/authentication-details', insecurity.isAuthorized())
app.use('/rest/basket/:id', insecurity.isAuthorized())
app.use('/rest/basket/:id/order', insecurity.isAuthorized())
/* Challenge evaluation before finale takes over */
app.post('/api/Feedbacks', verify.forgedFeedbackChallenge())
/* Captcha verification before finale takes over */
app.post('/api/Feedbacks', captcha.verifyCaptcha())
/* Captcha Bypass challenge verification */
app.post('/api/Feedbacks', verify.captchaBypassChallenge())
/* User registration challenge verifications before finale takes over */
app.post('/api/Users', verify.registerAdminChallenge())
app.post('/api/Users', verify.passwordRepeatChallenge())
/* Unauthorized users are not allowed to access B2B API */
app.use('/b2b/v2', insecurity.isAuthorized())
/* Check if the quantity is available and add item to basket */
app.put('/api/BasketItems/:id', insecurity.appendUserId(), basketItems.quantityCheckBeforeBasketItemUpdate())
app.post('/api/BasketItems', insecurity.appendUserId(), basketItems.quantityCheckBeforeBasketItemAddition(), basketItems.addBasketItem())
/* Accounting users are allowed to check and update quantities */
app.delete('/api/Quantitys/:id', insecurity.denyAll())
app.post('/api/Quantitys', insecurity.denyAll())
app.use('/api/Quantitys/:id', insecurity.isAccounting())
/* Feedbacks: Do not allow changes of existing feedback */
app.put('/api/Feedbacks/:id', insecurity.denyAll())
/* PrivacyRequests: Only allowed for authenticated users */
app.use('/api/PrivacyRequests', insecurity.isAuthorized())
app.use('/api/PrivacyRequests/:id', insecurity.isAuthorized())
/* PaymentMethodRequests: Only allowed for authenticated users */
app.post('/api/Cards', insecurity.appendUserId())
app.get('/api/Cards', insecurity.appendUserId(), payment.getPaymentMethods())
app.put('/api/Cards/:id', insecurity.denyAll())
app.delete('/api/Cards/:id', insecurity.appendUserId(), payment.delPaymentMethodById())
app.get('/api/Cards/:id', insecurity.appendUserId(), payment.getPaymentMethodById())
/* PrivacyRequests: Only POST allowed for authenticated users */
app.post('/api/PrivacyRequests', insecurity.isAuthorized())
app.get('/api/PrivacyRequests', insecurity.denyAll())
app.use('/api/PrivacyRequests/:id', insecurity.denyAll())

app.post('/api/Addresss', insecurity.appendUserId())
app.get('/api/Addresss', insecurity.appendUserId(), address.getAddress())
app.put('/api/Addresss/:id', insecurity.appendUserId())
app.delete('/api/Addresss/:id', insecurity.appendUserId(), address.delAddressById())
app.get('/api/Addresss/:id', insecurity.appendUserId(), address.getAddressById())
app.get('/api/Deliverys', delivery.getDeliveryMethods())
app.get('/api/Deliverys/:id', delivery.getDeliveryMethod())

/* Verify the 2FA Token */
app.post('/rest/2fa/verify',
  new RateLimit({ windowMs: 5 * 60 * 1000, max: 100 }),
  twoFactorAuth.verify()
)
/* Check 2FA Status for the current User */
app.get('/rest/2fa/status', insecurity.isAuthorized(), twoFactorAuth.status())
/* Enable 2FA for the current User */
app.post('/rest/2fa/setup',
  new RateLimit({ windowMs: 5 * 60 * 1000, max: 100 }),
  insecurity.isAuthorized(),
  twoFactorAuth.setup()
)
/* Disable 2FA Status for the current User */
app.post('/rest/2fa/disable',
  new RateLimit({ windowMs: 5 * 60 * 1000, max: 100 }),
  insecurity.isAuthorized(),
  twoFactorAuth.disable()
)
/* Serve metrics */
const Metrics = metrics.observeMetrics()
const metricsUpdateLoop = Metrics.updateLoop
app.get('/metrics', metrics.serveMetrics())

/* Verifying DB related challenges can be postponed until the next request for challenges is coming via finale */
app.use(verify.databaseRelatedChallenges())

/* Generated API endpoints */
finale.initialize({ app, sequelize: models.sequelize })

const autoModels = [
  { name: 'User', exclude: ['password', 'totpSecret'] },
  { name: 'Product', exclude: [] },
  { name: 'Feedback', exclude: [] },
  { name: 'BasketItem', exclude: [] },
  { name: 'Challenge', exclude: [] },
  { name: 'Complaint', exclude: [] },
  { name: 'Recycle', exclude: [] },
  { name: 'SecurityQuestion', exclude: [] },
  { name: 'SecurityAnswer', exclude: [] },
  { name: 'Address', exclude: [] },
  { name: 'PrivacyRequest', exclude: [] },
  { name: 'Card', exclude: [] },
  { name: 'Quantity', exclude: [] }
]

for (const { name, exclude } of autoModels) {
  const resource = finale.resource({
    model: models[name],
    endpoints: [`/api/${name}s`, `/api/${name}s/:id`],
    excludeAttributes: exclude
  })

  // create a wallet when a new user is registered using API
  if (name === 'User') {
    resource.create.send.before((req, res, context) => {
      models.Wallet.create({ UserId: context.instance.id }).catch((err) => {
        console.log(err)
      })
      return context.continue
    })
  }

  // translate challenge descriptions and hints on-the-fly
  if (name === 'Challenge') {
    resource.list.fetch.after((req, res, context) => {
      for (let i = 0; i < context.instance.length; i++) {
        let description = context.instance[i].description
        if (utils.contains(description, '<em>(This challenge is <strong>')) {
          const warning = description.substring(description.indexOf(' <em>(This challenge is <strong>'))
          description = description.substring(0, description.indexOf(' <em>(This challenge is <strong>'))
          context.instance[i].description = req.__(description) + req.__(warning)
        } else {
          context.instance[i].description = req.__(description)
        }
        if (context.instance[i].hint) {
          context.instance[i].hint = req.__(context.instance[i].hint)
        }
      }
      return context.continue
    })
    resource.read.send.before((req, res, context) => {
      context.instance.description = req.__(context.instance.description)
      if (context.instance.hint) {
        context.instance.hint = req.__(context.instance.hint)
      }
      return context.continue
    })
  }

  // translate security questions on-the-fly
  if (name === 'SecurityQuestion') {
    resource.list.fetch.after((req, res, context) => {
      for (let i = 0; i < context.instance.length; i++) {
        context.instance[i].question = req.__(context.instance[i].question)
      }
      return context.continue
    })
    resource.read.send.before((req, res, context) => {
      context.instance.question = req.__(context.instance.question)
      return context.continue
    })
  }

  // translate product names and descriptions on-the-fly
  if (name === 'Product') {
    resource.list.fetch.after((req, res, context) => {
      for (let i = 0; i < context.instance.length; i++) {
        context.instance[i].name = req.__(context.instance[i].name)
        context.instance[i].description = req.__(context.instance[i].description)
      }
      return context.continue
    })
    resource.read.send.before((req, res, context) => {
      context.instance.name = req.__(context.instance.name)
      context.instance.description = req.__(context.instance.description)
      return context.continue
    })
  }

  // fix the api difference between finale (fka epilogue) and previously used sequlize-restful
  resource.all.send.before((req, res, context) => {
    context.instance = {
      status: 'success',
      data: context.instance
    }
    return context.continue
  })
}

/* Custom Restful API */
app.post('/rest/user/login', login())
app.get('/rest/user/change-password', changePassword())
app.post('/rest/user/reset-password', resetPassword())
app.get('/rest/user/security-question', securityQuestion())
app.get('/rest/user/whoami', insecurity.updateAuthenticatedUsers(), currentUser())
app.get('/rest/user/authentication-details', authenticatedUsers())
app.get('/rest/products/search', search())
app.get('/rest/basket/:id', basket())
app.post('/rest/basket/:id/checkout', order())
app.put('/rest/basket/:id/coupon/:coupon', coupon())
app.get('/rest/admin/application-version', appVersion())
app.get('/rest/admin/application-configuration', appConfiguration())
app.get('/rest/repeat-notification', repeatNotification())
app.get('/rest/continue-code', continueCode())
app.put('/rest/continue-code/apply/:continueCode', restoreProgress())
app.get('/rest/admin/application-version', appVersion())
app.get('/rest/captcha', captcha())
app.get('/rest/image-captcha', imageCaptcha())
app.get('/rest/track-order/:id', trackOrder())
app.get('/rest/country-mapping', countryMapping())
app.get('/rest/saveLoginIp', saveLoginIp())
app.post('/rest/user/data-export', insecurity.appendUserId(), imageCaptcha.verifyCaptcha())
app.post('/rest/user/data-export', insecurity.appendUserId(), dataExport())
app.get('/rest/languages', languageList())
app.post('/rest/user/erasure-request', erasureRequest())
app.get('/rest/order-history', orderHistory.orderHistory())
app.get('/rest/order-history/orders', insecurity.isAccounting(), orderHistory.allOrders())
app.put('/rest/order-history/:id/delivery-status', insecurity.isAccounting(), orderHistory.toggleDeliveryStatus())
app.get('/rest/wallet/balance', insecurity.appendUserId(), wallet.getWalletBalance())
app.put('/rest/wallet/balance', insecurity.appendUserId(), wallet.addWalletBalance())
app.get('/rest/deluxe-membership', deluxe.deluxeMembershipStatus())
app.post('/rest/deluxe-membership', insecurity.appendUserId(), deluxe.upgradeToDeluxe())
app.get('/rest/memories', memory.getMemory())
/* NoSQL API endpoints */
app.get('/rest/products/:id/reviews', showProductReviews())
app.put('/rest/products/:id/reviews', createProductReviews())
app.patch('/rest/products/reviews', insecurity.isAuthorized(), updateProductReviews())
app.post('/rest/products/reviews', insecurity.isAuthorized(), likeProductReviews())

/* B2B Order API */
app.post('/b2b/v2/orders', b2bOrder())

/* File Serving */
app.get('/the/devs/are/so/funny/they/hid/an/easter/egg/within/the/easter/egg', easterEgg())
app.get('/this/page/is/hidden/behind/an/incredibly/high/paywall/that/could/only/be/unlocked/by/sending/1btc/to/us', premiumReward())
app.get('/we/may/also/instruct/you/to/refuse/all/reasonably/necessary/responsibility', privacyPolicyProof())

/* Route for redirects */
app.get('/redirect', redirect())

/* Routes for promotion video page */
app.get('/promotion', videoHandler.promotionVideo())
app.get('/video', videoHandler.getVideo())

/* Routes for profile page */
app.get('/profile', insecurity.updateAuthenticatedUsers(), userProfile())
app.post('/profile', updateUserProfile())

app.use(angular())

/* Error Handling */
app.use(verify.errorHandlingChallenge())
app.use(errorhandler())

exports.start = async function (readyCallback) {
  await models.sequelize.sync({ force: true })
  await datacreator()
  const port = process.env.PORT || config.get('server.port')
  process.env.BASE_PATH = process.env.BASE_PATH || config.get('server.basePath')

  server.listen(port, () => {
    logger.info(colors.cyan(`Server listening on port ${colors.bold(port)}`))
    if (process.env.BASE_PATH !== '') {
      logger.info(colors.cyan(`Server using proxy base path ${colors.bold(process.env.BASE_PATH)} for redirects`))
    }
    require('./lib/startup/registerWebsocketEvents')(server)
    if (readyCallback) {
      readyCallback()
    }
  })

  require('./lib/startup/customizeApplication')()
  require('./lib/startup/customizeEasterEgg')()
}

exports.close = function (exitCode) {
  if (server) {
    clearInterval(metricsUpdateLoop)
    server.close()
  }
  if (exitCode !== undefined) {
    process.exit(exitCode)
  }
}