Authentication.scala

import javax.servlet.http.{Cookie, HttpServletRequest}
import play.twirl.api.{Html, HtmlFormat}

import scala.util.{Failure, Success}

object Authentication {

  def authenticateCookie(
      request: HttpServletRequest): Option[UserTokenData] = {
    val token =
      request.getCookies.find((c: Cookie) => c.getName == "application_cookie")
    if (token.isEmpty) {
      val authFailure = AuthenticationFailure(request.getHeader("User-Agent"),
                                              request.getRequestURL.toString,
                                              request.getRemoteAddr)
      println("Error: application_cookie cookie not found")
      println("More information:")
      println(authFailure.toString)
      return None
    }
    val userToken = JWT.parseUserJwt(token.get.getValue)
    userToken match {
      case Success(utd) => Some(utd)
      case Failure(t) => {
        println("Error while parsing application_cookie cookie: " + t.toString)
        None
      }
    }
  }
}

case class AuthenticationFailure(userAgent: String,
                                 url: String,
                                 remoteAddr: String) {
  override def toString = {
    "AuthenticationFailure(\n" +
      "  User-Agent: " + userAgent + "\n" +
      "  Request URL: " + url + "\n" +
      "  Remote Address: " + remoteAddr + "\n" +
    ")"
  }
}