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Json support for Akka Streams/Http via Jawn

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/*
 * Copyright 2015 – 2017 Paul Horn
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package de.knutwalker.akka.http

import de.knutwalker.akka.stream.JsonStreamParser

import akka.http.scaladsl.model.HttpEntity
import akka.http.scaladsl.model.MediaTypes.`application/json`
import akka.http.scaladsl.unmarshalling.{ FromEntityUnmarshaller, Unmarshaller }
import akka.http.scaladsl.util.FastFuture

import jawn.Facade

import scala.language.implicitConversions


object JsonSupport extends JsonSupport

trait JsonSupport {

  implicit def jsonUnmarshaller[J: Facade]: FromEntityUnmarshaller[J] =
    Unmarshaller.withMaterializer[HttpEntity, J](_ ⇒ implicit mat ⇒ {
      case HttpEntity.Strict(_, data) ⇒ FastFuture(JsonStreamParser.parse[J](data))
      case entity                     ⇒ entity.dataBytes.runWith(JsonStreamParser.head[J])
    }).forContentTypes(`application/json`)
}