Lambda HoC for authenticating requests with dynamoDB

authentication.js

const Account = require("../models/account")

module.exports = (handler) => async (event, context) => {
  let auth = event.headers.authorization
  auth = auth.replace(/^Basic\s/, "")
  auth = Buffer.from(auth, 'base64').toString()
  const [id, token] = auth.split(":")

  const account = await Account.get({ id })

  if (!account || account.token !== token) {
    return {
      statusCode: 401,
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        error: "Access token invalid"
      })
    }
  }

  return await handler(event, { ...context, account })
}