index.js

const Corsify = require('corsify')
const HttpHashRouter = require('http-hash-router')

const API = require('./api')

module.exports = function (opts) {
  opts.dbUsers = opts.dbUsers || opts.db
  checkInitErrors(opts)

  const routePrefix = opts.routePrefix || '/auth'

  const shouldGoogle =
    opts.googleClientId && opts.googleClientSecret && opts.googleRedirectUrl

  const api = API(opts)

  const router = HttpHashRouter()
  router.set(`${routePrefix}/login`, { POST: api.login.bind(api) })
  router.set(`${routePrefix}/signup`, { POST: api.signup.bind(api) })
  router.set(`${routePrefix}/confirm`, { POST: api.confirm.bind(api) })
  router.set(`${routePrefix}/change-password-request`, {
    POST: api.changePasswordRequest.bind(api)
  })
  router.set(`${routePrefix}/change-password`, {
    POST: api.changePassword.bind(api)
  })
  router.set(`${routePrefix}/magic-request`, {
    POST: api.magicRequest.bind(api)
  })
  router.set(`${routePrefix}/magic-login`, { POST: api.magicLogin.bind(api) })
  router.set(`${routePrefix}/public-key`, { GET: api.publicKey.bind(api) })

  if (shouldGoogle) {
    router.set(`${routePrefix}/google`, { GET: api.googleAuth.bind(api) })
    router.set(`${routePrefix}/google/callback`, {
      GET: api.googleCallback.bind(api)
    })
  }

  if (opts.dbExpiry) {
    router.set(`${routePrefix}/expired`, { GET: api.expired.bind(api) })
  }

  function handler (req, res, next) {
    Corsify(
      {
        'Access-Control-Allow-Headers': 'authorization, accept, content-type'
      },
      function (req, res) {
        router(req, res, {}, onError)
      }
    )(req, res)

    function onError (err) {
      if (!err) return
      if (next && err.statusCode === 404) return next(req, res)

      res.writeHead(err.statusCode || 500, {
        'Content-Type': 'application/json'
      })
      res.end(
        JSON.stringify({
          success: false,
          error: err.message
        })
      )
    }
  }

  return handler
}

function checkInitErrors (opts) {
  if (!opts.dbUsers) {
    throw new Error(
      'Authentic: no user db given, must have "get" and "put" methods.'
    )
  }

  if (!opts.publicKey || !opts.privateKey) {
    throw new Error('Authentic: no public or private key given')
  }

  if (!opts.sendEmail) {
    throw new Error('Authentic: no "sendEmail" method given')
  }
}