Logging request as cUrl

LoggingUtils.scala

import akka.http.scaladsl.model.HttpRequest
import akka.http.scaladsl.server.Directive0
import akka.http.scaladsl.server.directives.{DebuggingDirectives, LoggingMagnet}
import akka.http.scaladsl.unmarshalling.Unmarshal
import akka.stream.Materializer
import org.slf4j.Logger

import scala.concurrent.{ExecutionContext, Future}
import scala.util.{Failure, Success}

trait LoggingUtils {

  implicit def ec: ExecutionContext
  implicit def mat: Materializer

  def requestAsCurlString(req: HttpRequest): Future[String] =
    Unmarshal(req.entity).to[String]
      .map { body =>
        val entries = s"--request ${req.method.value} '${req.uri}'" ::
          s"--header 'Content-Type: ${req.entity.contentType}'" ::
          req.headers.map(h => s"--header '$h'").toList :::
          s"--data-raw '$body'" ::
          Nil
        "curl " + entries.mkString(" \\\n")
      }

  def printRequestMethod(log: Logger)(req: HttpRequest): Unit = {
    requestAsCurlString(req).onComplete {
      case Success(value)     => log.info("Request in cUrl form is:\n{}", value)
      case Failure(exception) => log.error("Unable to log request", exception)
    }
  }

  def withLogging(log: Logger): Directive0 =
    DebuggingDirectives.logRequest(LoggingMagnet(_ => printRequestMethod(log)))
}