1 object Application extends Controller {

     2 

     3   val salt = "my secret key"

     4 

     5   //SHA-1 + salt

     6   def mk_hash(s: String) : String = {

     7     val hash_fun = MessageDigest.getInstance("SHA-1")

     8     hash_fun.digest((s + salt).getBytes).map{ "%02x".format(_) }.mkString

     9   }

    10 

    11   def gt_cookie(c: Cookie) : Int = c.value.split("/") match {

    12     case Array(s, h) 

    13       if (s.forall(_.isDigit) && mk_hash(s) == h) => s.toInt 

    14     case _ => 0

    15   }

    16 

    17   def mk_cookie(i: Int) : Cookie = {

    18     val hash = mk_hash(i.toString)

    19     Cookie("visits", s"$i/$hash")

    20   }

    21    

    22   def index = Action { request => ... }

    23 }

    24 

    25 

    26 

    27