basicauth.scala

for{
      header <- Option(req.getHeader("Authorization"))
      base64 <- Option(header.substring(0,6)) if base64.equals("Basic ")
      encoded <- Option(header.substring(6))
      auth <- Option(new String(new Base64().decode(encoded.getBytes))) if auth == "%s:%s".format(Config.basicUser, Config.basicPassword)
} yield auth

if(auth.isEmpty) {
      resp.setHeader("WWW-Authenticate", "Basic Realm=\"cloudbees\"")
      resp.setStatus(HttpServletResponse.SC_UNAUTHORIZED)
      resp.flushBuffer
}