1 object Application extends Controller {

     2 

     3   //SHA-1, SHA-256

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

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

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

     7   }

     8 

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

    10     case Array(s, h) 

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

    12     case _ => 0

    13   }

    14 

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

    16     val hash = mk_hash(i.toString)

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

    18   }

    19    

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

    21 }

    22 

    23 

    24 

    25