Jwt.scala

import org.json4s.DefaultFormats
import org.json4s.jackson.JsonMethods.parse
import pdi.jwt.{Jwt, JwtAlgorithm}

import scala.util.Try
/*
* This object decodes JWTs that are created by another application.
* There are a few different options available for parsing JWTs and I went with:
* http://pauldijou.fr/jwt-scala/samples/jwt-core/
*/
object JWT {
  implicit val formats = DefaultFormats
  def parseUserJwt(token: String): Try[UserTokenData] = {
    for {
      decoded <- Jwt.decode(token,
                            Configuration.SecretKey,
                            Seq(JwtAlgorithm.HS256)) // this will return a string
      userTokenData = parse(decoded).extract[Token].data // this parses the string to JSON and extracts to a token
    } yield userTokenData
  }
}

case class Token(data: UserTokenData, exp: Int, iat: Int, iss: String)
case class UserTokenData(email: String)