progs/app3.scala
author Christian Urban <christian dot urban at kcl dot ac dot uk>
Sun, 22 Sep 2013 15:35:50 +0100
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object Application extends Controller {
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  //SHA-1, SHA-256
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  def mk_hash(s: String) : String = {
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    val hash_fun = MessageDigest.getInstance("SHA-1")
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    hash_fun.digest(s.getBytes).map{ "%02x".format(_) }.mkString
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  }
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  def gt_cookie(c: Option[Cookie]) : Int = 
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    c.map(_.value.split("/")) match {
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      case Some(Array(s, h)) 
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        if (s.forall(_.isDigit) && mk_hash(s) == h) => s.toInt 
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      case _ => 0
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    }
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  def mk_cookie(i: Int) : Cookie = {
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    val s = i.toString
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    Cookie("visits", s + "/" + mk_hash(s))
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  }
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  def index = Action { request => ... }     
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}
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