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package com.softwaremill.sttp.akkahttp
import akka.actor.{ActorSystem, Terminated}
import akka.http.scaladsl.Http
import akka.http.scaladsl.model.HttpHeader.ParsingResult
import akka.http.scaladsl.model._
import akka.http.scaladsl.model.headers.`Content-Type`
import akka.http.scaladsl.model.ContentTypes.`application/octet-stream`
import akka.stream.ActorMaterializer
import akka.stream.scaladsl.{Source, StreamConverters}
import akka.util.ByteString
import com.softwaremill.sttp._
import com.softwaremill.sttp.model._
import scala.concurrent.Future
import scala.util.{Failure, Success, Try}
class AkkaHttpSttpHandler(actorSystem: ActorSystem)
extends SttpHandler[Future, Source[ByteString, Any]] {
def this() = this(ActorSystem("sttp"))
private implicit val as = actorSystem
private implicit val materializer = ActorMaterializer()
import as.dispatcher
override def send[T](r: Request,
responseAs: ResponseAs[T, Source[ByteString, Any]])
: Future[Response[T]] = {
requestToAkka(r)
.map(setBodyOnAkka(r, r.body, _).get)
.flatMap(Http().singleRequest(_))
.flatMap { hr =>
val code = hr.status.intValue()
bodyFromAkka(responseAs, hr).map(Response(code, _))
}
}
private def methodToAkka(m: Method): HttpMethod = m match {
case Method.GET => HttpMethods.GET
case Method.HEAD => HttpMethods.HEAD
case Method.POST => HttpMethods.POST
case Method.PUT => HttpMethods.PUT
case Method.DELETE => HttpMethods.DELETE
case Method.OPTIONS => HttpMethods.OPTIONS
case Method.PATCH => HttpMethods.PATCH
case Method.CONNECT => HttpMethods.CONNECT
case Method.TRACE => HttpMethods.TRACE
case _ => HttpMethod.custom(m.m)
}
private def bodyFromAkka[T](rr: ResponseAs[T, Source[ByteString, Any]],
hr: HttpResponse): Future[T] = {
def asByteArray =
hr.entity.dataBytes
.runFold(ByteString(""))(_ ++ _)
.map(_.toArray[Byte])
rr match {
case IgnoreResponse =>
hr.discardEntityBytes()
Future.successful(())
case ResponseAsString(enc) =>
asByteArray.map(new String(_, enc))
case ResponseAsByteArray =>
asByteArray
case r @ ResponseAsStream() =>
Future.successful(r.responseIsStream(hr.entity.dataBytes))
}
}
private def requestToAkka(r: Request): Future[HttpRequest] = {
val ar = HttpRequest(uri = r.uri.toString, method = methodToAkka(r.method))
val parsed =
r.headers.filterNot(isContentType).map(h => HttpHeader.parse(h._1, h._2))
val errors = parsed.collect {
case ParsingResult.Error(e) => e
}
if (errors.isEmpty) {
val headers = parsed.collect {
case ParsingResult.Ok(h, _) => h
}
Future.successful(ar.withHeaders(headers.toList))
} else {
Future.failed(new RuntimeException(s"Cannot parse headers: $errors"))
}
}
private def setBodyOnAkka(r: Request,
body: RequestBody,
ar: HttpRequest): Try[HttpRequest] = {
getContentTypeOrOctetStream(r).map { ct =>
def doSet(body: RequestBody): HttpRequest = body match {
case NoBody => ar
case StringBody(b, encoding) =>
val ctWithEncoding = HttpCharsets
.getForKey(encoding)
.map(hc => ContentType.apply(ct.mediaType, () => hc))
.getOrElse(ct)
ar.withEntity(ctWithEncoding, b.getBytes(encoding))
case ByteArrayBody(b) => ar.withEntity(b)
case ByteBufferBody(b) => ar.withEntity(ByteString(b))
case InputStreamBody(b) =>
ar.withEntity(
HttpEntity(ct, StreamConverters.fromInputStream(() => b)))
case FileBody(b) => ar.withEntity(ct, b.toPath)
case PathBody(b) => ar.withEntity(ct, b)
case s @ SerializableBody(_, _) => doSetSerializable(s)
}
def doSetSerializable[T](body: SerializableBody[T]): HttpRequest =
body match {
case SerializableBody(SourceBodySerializer, t) =>
ar.withEntity(HttpEntity(ct, t))
case SerializableBody(f, t) => doSet(f(t))
}
doSet(body)
}
}
private def getContentTypeOrOctetStream(r: Request): Try[ContentType] = {
r.headers
.find(isContentType)
.map(_._2)
.map { ct =>
ContentType
.parse(ct)
.fold(
errors =>
Failure(
new RuntimeException(s"Cannot parse content type: $errors")),
Success(_))
}
.getOrElse(Success(`application/octet-stream`))
}
private def isContentType(header: (String, String)) =
header._1.toLowerCase.contains(`Content-Type`.lowercaseName)
def close(): Future[Terminated] = {
actorSystem.terminate()
}
}
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