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package com.softwaremill.sttp.akkahttp
import java.io.{File, IOException, UnsupportedEncodingException}
import akka.actor.ActorSystem
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.{Multipart => AkkaMultipart, _}
import akka.http.scaladsl.model.headers.{
HttpEncodings,
`Content-Type`,
`Content-Length`
}
import akka.http.scaladsl.model.ContentTypes.`application/octet-stream`
import akka.stream.ActorMaterializer
import akka.stream.scaladsl.{FileIO, 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)))
}
}
override def responseMonad: MonadError[Future] = new FutureMonad()(ec)
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 saved(file: File, overwrite: Boolean) = {
if (!file.exists()) {
file.getParentFile.mkdirs()
file.createNewFile()
} else if (!overwrite) {
throw new IOException(
s"File ${file.getAbsolutePath} exists - overwriting prohibited")
}
hr.entity.dataBytes.runWith(FileIO.toPath(file.toPath))
}
rr match {
case MappedResponseAs(raw, g) => bodyFromAkka(raw, hr).map(g)
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))
case ResponseAsFile(file, overwrite) =>
saved(file, overwrite).map(_ => file)
}
}
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))
headersToAkka(r.headers).map(ar.withHeaders)
}
private def headersToAkka(
headers: Seq[(String, String)]): Try[Seq[HttpHeader]] = {
// content-type and content-length headers have to be set via the body
// entity, not as headers
val parsed =
headers
.filterNot(isContentType)
.filterNot(isContentLength)
.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(headers.toList)
} else {
Failure(new RuntimeException(s"Cannot parse headers: $errors"))
}
}
private def traverseTry[T](l: Seq[Try[T]]): Try[Seq[T]] = {
// https://stackoverflow.com/questions/15495678/flatten-scala-try
val (ss: Seq[Success[T]] @unchecked, fs: Seq[Failure[T]] @unchecked) =
l.partition(_.isSuccess)
if (fs.isEmpty) Success(ss.map(_.get))
else Failure[Seq[T]](fs.head.exception)
}
private def setBodyOnAkka(r: Request[_, S],
body: RequestBody[S],
ar: HttpRequest): Try[HttpRequest] = {
def ctWithEncoding(ct: ContentType, encoding: String) =
HttpCharsets
.getForKey(encoding)
.map(hc => ContentType.apply(ct.mediaType, () => hc))
.getOrElse(ct)
def toBodyPart(mp: Multipart): Try[AkkaMultipart.FormData.BodyPart] = {
def entity(ct: ContentType) = mp.body match {
case StringBody(b, encoding, _) =>
HttpEntity(ctWithEncoding(ct, encoding), b.getBytes(encoding))
case ByteArrayBody(b, _) => HttpEntity(ct, b)
case ByteBufferBody(b, _) => HttpEntity(ct, ByteString(b))
case isb: InputStreamBody =>
HttpEntity
.IndefiniteLength(ct, StreamConverters.fromInputStream(() => isb.b))
case PathBody(b, _) => HttpEntity.fromPath(ct, b)
}
for {
ct <- parseContentTypeOrOctetStream(mp.contentType)
headers <- headersToAkka(mp.additionalHeaders.toList)
} yield {
val dispositionParams =
mp.fileName.fold(Map.empty[String, String])(fn =>
Map("filename" -> fn))
AkkaMultipart.FormData.BodyPart(mp.name,
entity(ct),
dispositionParams,
headers)
}
}
parseContentTypeOrOctetStream(r).flatMap { ct =>
body match {
case NoBody => Success(ar)
case StringBody(b, encoding, _) =>
Success(
ar.withEntity(ctWithEncoding(ct, encoding), b.getBytes(encoding)))
case ByteArrayBody(b, _) => Success(ar.withEntity(HttpEntity(ct, b)))
case ByteBufferBody(b, _) =>
Success(ar.withEntity(HttpEntity(ct, ByteString(b))))
case InputStreamBody(b, _) =>
Success(
ar.withEntity(
HttpEntity(ct, StreamConverters.fromInputStream(() => b))))
case PathBody(b, _) => Success(ar.withEntity(ct, b))
case StreamBody(s) => Success(ar.withEntity(HttpEntity(ct, s)))
case MultipartBody(ps) =>
traverseTry(ps.map(toBodyPart))
.map(bodyParts =>
ar.withEntity(AkkaMultipart.FormData(bodyParts: _*).toEntity()))
}
}
}
private def parseContentTypeOrOctetStream(
r: Request[_, S]): Try[ContentType] = {
parseContentTypeOrOctetStream(
r.headers
.find(isContentType)
.map(_._2))
}
private def parseContentTypeOrOctetStream(
ctHeader: Option[String]): Try[ContentType] = {
ctHeader
.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)
private def isContentLength(header: (String, String)) =
header._1.toLowerCase.contains(`Content-Length`.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 = {
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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