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JdkHttpClient.scala
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JdkHttpClient.scala
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package org.http4s.client.jdkhttpclient
import java.net.URI
import java.net.http.HttpRequest.BodyPublishers
import java.net.http.HttpResponse.BodyHandlers
import java.net.http.{HttpClient, HttpRequest, HttpResponse}
import java.nio.ByteBuffer
import java.util
import java.util.concurrent.Flow
import cats.ApplicativeError
import cats.effect._
import cats.implicits._
import fs2.concurrent.SignallingRef
import fs2.interop.reactivestreams._
import fs2.{Chunk, Stream}
import org.http4s.client.Client
import org.http4s.client.jdkhttpclient.compat.CollectionConverters._
import org.http4s.internal.fromCompletionStage
import org.http4s.util.CaseInsensitiveString
import org.http4s.{Header, Headers, HttpVersion, Request, Response, Status}
import org.reactivestreams.FlowAdapters
object JdkHttpClient {
/** Creates a `Client` from an `HttpClient`. Note that the creation of an `HttpClient` is a
* side effect.
*
* @param jdkHttpClient The `HttpClient`.
* @param ignoredHeaders A set of ignored request headers. Some headers (like Content-Length) are
* "restricted" and cannot be set by the user. By default, the set of
* restricted headers of the OpenJDK 11 is used.
*/
def apply[F[_]](
jdkHttpClient: HttpClient,
ignoredHeaders: Set[CaseInsensitiveString] = restrictedHeaders
)(implicit F: ConcurrentEffect[F], CS: ContextShift[F]): Client[F] = {
def convertRequest(req: Request[F]): F[HttpRequest] =
convertHttpVersionFromHttp4s[F](req.httpVersion).map { version =>
val rb = HttpRequest.newBuilder
.method(
req.method.name, {
val publisher = FlowAdapters.toFlowPublisher(
StreamUnicastPublisher(req.body.chunks.map(_.toByteBuffer))
)
if (req.isChunked)
BodyPublishers.fromPublisher(publisher)
else
req.contentLength
.fold(BodyPublishers.noBody)(BodyPublishers.fromPublisher(publisher, _))
}
)
.uri(URI.create(req.uri.renderString))
.version(version)
val headers = req.headers.iterator
.filterNot(h => ignoredHeaders.contains(h.name))
.flatMap(h => Iterator(h.name.value, h.value))
.toArray
(if (headers.isEmpty) rb else rb.headers(headers: _*)).build
}
def convertResponse(
res: HttpResponse[Flow.Publisher[util.List[ByteBuffer]]]
): Resource[F, Response[F]] =
Resource(
(F.fromEither(Status.fromInt(res.statusCode)), SignallingRef[F, Boolean](false)).mapN {
case (status, signal) =>
Response(
status = status,
headers = Headers(res.headers.map.asScala.flatMap { case (k, vs) =>
vs.asScala.map(Header(k, _))
}.toList),
httpVersion = res.version match {
case HttpClient.Version.HTTP_1_1 => HttpVersion.`HTTP/1.1`
case HttpClient.Version.HTTP_2 => HttpVersion.`HTTP/2.0`
},
body = FlowAdapters
.toPublisher(res.body)
.toStream[F]
.interruptWhen(signal)
.flatMap(bs => Stream.fromIterator(bs.iterator.asScala.map(Chunk.byteBuffer)))
.flatMap(Stream.chunk)
) -> signal.set(true)
}
)
Client[F] { req =>
for {
req <- Resource.liftF(convertRequest(req))
res <- Resource.liftF(
fromCompletionStage(F.delay(jdkHttpClient.sendAsync(req, BodyHandlers.ofPublisher)))
)
res <- convertResponse(res)
} yield res
}
}
/** A `Client` wrapping the default `HttpClient`.
*/
def simple[F[_]](implicit F: ConcurrentEffect[F], CS: ContextShift[F]): F[Client[F]] =
defaultHttpClient[F].map(apply(_))
private[jdkhttpclient] def defaultHttpClient[F[_]](implicit F: Sync[F]): F[HttpClient] =
F.delay {
val builder = HttpClient.newBuilder()
// workaround for https://github.com/http4s/http4s-jdk-http-client/issues/200
if (Runtime.version().feature() == 11) {
val params = javax.net.ssl.SSLContext.getDefault().getDefaultSSLParameters()
params.setProtocols(params.getProtocols().filter(_ != "TLSv1.3"))
builder.sslParameters(params)
}
builder.build()
}
def convertHttpVersionFromHttp4s[F[_]](
version: HttpVersion
)(implicit F: ApplicativeError[F, Throwable]): F[HttpClient.Version] =
version match {
case HttpVersion.`HTTP/1.1` => HttpClient.Version.HTTP_1_1.pure[F]
case HttpVersion.`HTTP/2.0` => HttpClient.Version.HTTP_2.pure[F]
case _ => F.raiseError(new IllegalArgumentException("invalid HTTP version"))
}
// see jdk.internal.net.http.common.Utils#DISALLOWED_HEADERS_SET
private val restrictedHeaders =
Set(
"connection",
"content-length",
"date",
"expect",
"from",
"host",
"upgrade",
"via",
"warning"
).map(CaseInsensitiveString(_))
}