Akka/Scala example source code file (generate_config_with_secure_cookie.sh)

This example Akka source code file (generate_config_with_secure_cookie.sh) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Akka and Scala source code examples by using tags.

All credit for the original source code belongs to akka.io; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Akka tags/keywords

array, ascii, crypt, md5, messagedigest, sha1, sha1prng, string, stringbuilder

The generate_config_with_secure_cookie.sh Akka example source code

#!/bin/sh
exec scala "$0" "$@"
!#

/**
 * Copyright (C) 2009-2014 Typesafe Inc. <http://www.typesafe.com>
 */
import java.security.{MessageDigest, SecureRandom}

object Crypt {
  val hex = "0123456789ABCDEF"
  val lineSeparator = System.getProperty("line.separator")

  lazy val random = SecureRandom.getInstance("SHA1PRNG")

  def md5(text: String): String        = md5(unifyLineSeparator(text).getBytes("ASCII"))

  def md5(bytes: Array[Byte]): String  = digest(bytes, MessageDigest.getInstance("MD5"))

  def sha1(text: String): String       = sha1(unifyLineSeparator(text).getBytes("ASCII"))

  def sha1(bytes: Array[Byte]): String = digest(bytes, MessageDigest.getInstance("SHA1"))

  def generateSecureCookie: String = {
    val bytes = Array.fill(32)(0.byteValue)
    random.nextBytes(bytes)
    sha1(bytes)
  }

  def digest(bytes: Array[Byte], md: MessageDigest): String = {
    md.update(bytes)
    hexify(md.digest)
  }

  def hexify(bytes: Array[Byte]): String = {
    val builder = new StringBuilder
    bytes.foreach { byte => builder.append(hex.charAt((byte & 0xF) >> 4)).append(hex.charAt(byte & 0xF)) }
    builder.toString
  }

  private def unifyLineSeparator(text: String): String = text.replaceAll(lineSeparator, "\n")
}

print("""
akka {
  remote {
    secure-cookie = "%s"
    require-cookie = on
  }
}
""".format(Crypt.generateSecureCookie))