Compute sha1 checksum of file in Play framework 2.4.x during upload

Controller.scala

val uploadDir = "/tmp/uploads/"
def uploadParted = Action.async(parse.multipartFormData(
  handleFilePart {
    case FileInfo(partName, fileName, contentType) =>
      val tempFile = File.createTempFile("file_prefix", "")
      val initialState = (MessageDigest.getInstance("SHA-1"), tempFile, new FileOutputStream(tempFile))
      Iteratee.fold[Array[Byte],
      (MessageDigest, File, FileOutputStream)](initialState) {
      case ((md, file, os), data) =>
        md.update(data)
        os.write(data)
        (md, file, os)
    } map {
      case (md, file, os) =>
        os.close()
        (md.digest.map("%02x".format(_)).mkString, file)
    }
  })
) { implicit request =>
  Future {
    request.body.file("video") map { x =>
      x.ref match {
        case (sha: String, file: File) =>
          println("sha is " + sha)
          Files.moveFile(file, new File(uploadDir + sha), true)
          Ok("File uploaded")
      }
    } getOrElse BadRequest("No video provided")
  }
}