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package com.softwaremill.sttp.akkahttp
import java.io.UnsupportedEncodingException
import akka.actor.{ActorSystem, Terminated}
import akka.http.scaladsl.Http
import akka.http.scaladsl.coding.{Deflate, Gzip, NoCoding}
import akka.http.scaladsl.model.HttpHeader.ParsingResult
import akka.http.scaladsl.model._
import akka.http.scaladsl.model.headers.{HttpEncodings, `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.{ExecutionContext, Future}
import scala.util.{Failure, Success, Try}
import scala.collection.immutable.Seq
class AkkaHttpSttpHandler private (actorSystem: ActorSystem,
ec: ExecutionContext,
terminateActorSystemOnClose: Boolean)
extends SttpHandler[Future, Source[ByteString, Any]] {
// the supported stream type
private type S = Source[ByteString, Any]
private implicit val as = actorSystem
private implicit val materializer = ActorMaterializer()
override def send[T](r: Request[T, S]): Future[Response[T]] = {
implicit val ec = this.ec
requestToAkka(r)
.flatMap(setBodyOnAkka(r, r.body, _))
.toFuture
.flatMap(Http().singleRequest(_))
.flatMap { hr =>
val code = hr.status.intValue()
bodyFromAkka(r.responseAs, decodeAkkaResponse(hr))
.map(Response(_, code, headersFromAkka(hr)))
}
}
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, S],
hr: HttpResponse): Future[T] = {
implicit val ec = this.ec
def asByteArray =
hr.entity.dataBytes
.runFold(ByteString(""))(_ ++ _)
.map(_.toArray[Byte])
def asString(enc: String) =
asByteArray.map(new String(_, enc))
rr match {
case MappedResponseAs(raw, g) => bodyFromAkka(raw, hr).map(g)
case IgnoreResponse =>
hr.discardEntityBytes()
Future.successful(())
case ResponseAsString(enc) =>
asString(enc)
case ResponseAsByteArray =>
asByteArray
case r @ ResponseAsParams(enc) =>
asString(enc).map(r.parse)
case r @ ResponseAsStream() =>
Future.successful(r.responseIsStream(hr.entity.dataBytes))
}
}
private def headersFromAkka(hr: HttpResponse): Seq[(String, String)] = {
val ch = ContentTypeHeader -> hr.entity.contentType.toString()
val cl =
hr.entity.contentLengthOption.map(ContentLengthHeader -> _.toString)
val other = hr.headers.map(h => (h.name, h.value))
ch :: (cl.toList ++ other)
}
private def requestToAkka(r: Request[_, S]): Try[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
}
Success(ar.withHeaders(headers.toList))
} else {
Failure(new RuntimeException(s"Cannot parse headers: $errors"))
}
}
private def setBodyOnAkka(r: Request[_, S],
body: RequestBody[S],
ar: HttpRequest): Try[HttpRequest] = {
getContentTypeOrOctetStream(r).map { ct =>
def doSet(body: RequestBody[S]): 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 PathBody(b) => ar.withEntity(ct, b)
case StreamBody(s) => ar.withEntity(HttpEntity(ct, s))
case SerializableBody(f, t) => doSet(f(t))
}
doSet(body)
}
}
private def getContentTypeOrOctetStream(r: Request[_, S]): 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)
// http://doc.akka.io/docs/akka-http/10.0.7/scala/http/common/de-coding.html
private def decodeAkkaResponse(response: HttpResponse): HttpResponse = {
val decoder = response.encoding match {
case HttpEncodings.gzip => Gzip
case HttpEncodings.deflate => Deflate
case HttpEncodings.identity => NoCoding
case ce =>
throw new UnsupportedEncodingException(s"Unsupported encoding: $ce")
}
decoder.decodeMessage(response)
}
override def close(): Unit = {
implicit val ec = this.ec
if (terminateActorSystemOnClose) actorSystem.terminate()
}
private implicit class RichTry[T](t: Try[T]) {
def toFuture: Future[T] = t match {
case Success(v) => Future.successful(v)
case Failure(v) => Future.failed(v)
}
}
}
object AkkaHttpSttpHandler {
/**
* @param ec The execution context for running non-network related operations,
* e.g. mapping responses. Defaults to the global execution
* context.
*/
def apply()(
implicit ec: ExecutionContext = ExecutionContext.Implicits.global)
: SttpHandler[Future, Source[ByteString, Any]] =
new AkkaHttpSttpHandler(ActorSystem("sttp"), ec, true)
/**
* @param actorSystem The actor system which will be used for the http-client
* actors.
* @param ec The execution context for running non-network related operations,
* e.g. mapping responses. Defaults to the global execution
* context.
*/
def usingActorSystem(actorSystem: ActorSystem)(
implicit ec: ExecutionContext = ExecutionContext.Implicits.global)
: SttpHandler[Future, Source[ByteString, Any]] =
new AkkaHttpSttpHandler(actorSystem, ec, false)
}
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