import { HttpRequest } from 'aws-sdk'

import { isBlank } from '../string'

const BEARER_REGEX = /(Bearer)(\s)(.+$)/

export const extractBearerToken = (request: HttpRequest): string => {
  const token = request.headers.authorization

  if (isBlank(token)) return null

  const matches = token.match(BEARER_REGEX)

  if (matches.length === 4) {
    return matches[3]
  }

  return null
}