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package com.softwaremill.sttp
import java.io._
import java.net.{HttpURLConnection, URL}
import java.nio.channels.Channels
import java.nio.charset.CharacterCodingException
import java.nio.file.Files
import java.util.concurrent.ThreadLocalRandom
import java.util.zip.{GZIPInputStream, InflaterInputStream}
import scala.annotation.tailrec
import scala.collection.JavaConverters._
import scala.concurrent.duration.Duration
import scala.io.Source
class HttpURLConnectionBackend private (
opts: SttpBackendOptions,
customizeConnection: HttpURLConnection => Unit)
extends SttpBackend[Id, Nothing] {
override def send[T](r: Request[T, Nothing]): Response[T] = {
val c = openConnection(r.uri)
c.setRequestMethod(r.method.m)
r.headers.foreach { case (k, v) => c.setRequestProperty(k, v) }
c.setDoInput(true)
c.setReadTimeout(timeout(r.options.readTimeout))
c.setConnectTimeout(timeout(opts.connectionTimeout))
// redirects are handled by FollowRedirectsBackend
c.setInstanceFollowRedirects(false)
customizeConnection(c)
if (r.body != NoBody) {
c.setDoOutput(true)
// we need to take care to:
// (1) only call getOutputStream after the headers are set
// (2) call it ony once
writeBody(r.body, c).foreach { os =>
os.flush()
os.close()
}
}
try {
val is = c.getInputStream
readResponse(c, is, r.response)
} catch {
case e: CharacterCodingException => throw e
case e: UnsupportedEncodingException => throw e
case _: IOException if c.getResponseCode != -1 =>
readResponse(c, c.getErrorStream, r.response)
}
}
override val responseMonad: MonadError[Id] = IdMonad
private def openConnection(uri: Uri): HttpURLConnection = {
val url = new URL(uri.toString)
val conn = opts.proxy match {
case None => url.openConnection()
case Some(p) =>
url.openConnection(p.asJava)
}
conn.asInstanceOf[HttpURLConnection]
}
private def writeBody(body: RequestBody[Nothing],
c: HttpURLConnection): Option[OutputStream] = {
body match {
case NoBody =>
// skip
None
case b: BasicRequestBody =>
val os = c.getOutputStream
writeBasicBody(b, os)
Some(os)
case StreamBody(s) =>
// we have an instance of nothing - everything's possible!
None
case mp: MultipartBody =>
setMultipartBody(mp, c)
}
}
private def timeout(t: Duration): Int =
if (t.isFinite()) t.toMillis.toInt
else 0
private def writeBasicBody(body: BasicRequestBody, os: OutputStream): Unit = {
body match {
case StringBody(b, encoding, _) =>
val writer = new OutputStreamWriter(os, encoding)
writer.write(b)
// don't close - as this will close the underlying OS and cause errors
// with multi-part
writer.flush()
case ByteArrayBody(b, _) =>
os.write(b)
case ByteBufferBody(b, _) =>
val channel = Channels.newChannel(os)
channel.write(b)
case InputStreamBody(b, _) =>
transfer(b, os)
case PathBody(b, _) =>
Files.copy(b, os)
}
}
private val BoundaryChars =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789".toCharArray
private def setMultipartBody(mp: MultipartBody,
c: HttpURLConnection): Option[OutputStream] = {
val boundary = {
val tlr = ThreadLocalRandom.current()
List
.fill(32)(BoundaryChars(tlr.nextInt(BoundaryChars.length)))
.mkString
}
// inspired by: https://github.com/scalaj/scalaj-http/blob/master/src/main/scala/scalaj/http/Http.scala#L542
val partsWithHeaders = mp.parts.map { p =>
val contentDisposition =
s"$ContentDispositionHeader: ${p.contentDispositionHeaderValue}"
val contentTypeHeader =
p.contentType.map(ct => s"$ContentTypeHeader: $ct")
val otherHeaders = p.additionalHeaders.map(h => s"${h._1}: ${h._2}")
val allHeaders = List(contentDisposition) ++ contentTypeHeader.toList ++ otherHeaders
(allHeaders.mkString(CrLf), p)
}
val dashes = "--"
val dashesLen = dashes.length.toLong
val crLfLen = CrLf.length.toLong
val boundaryLen = boundary.length.toLong
val finalBoundaryLen = dashesLen + boundaryLen + dashesLen + crLfLen
// https://stackoverflow.com/questions/31406022/how-is-an-http-multipart-content-length-header-value-calculated
val contentLength = partsWithHeaders
.map {
case (headers, p) =>
val bodyLen: Option[Long] = p.body match {
case StringBody(b, encoding, _) =>
Some(b.getBytes(encoding).length.toLong)
case ByteArrayBody(b, _) => Some(b.length.toLong)
case ByteBufferBody(b, _) => None
case InputStreamBody(b, _) => None
case PathBody(b, _) => Some(b.toFile.length())
}
val headersLen = headers.getBytes(Iso88591).length
bodyLen.map(bl =>
dashesLen + boundaryLen + crLfLen + headersLen + crLfLen + crLfLen + bl + crLfLen)
}
.foldLeft(Option(finalBoundaryLen)) {
case (Some(acc), Some(l)) => Some(acc + l)
case _ => None
}
c.setRequestProperty(ContentTypeHeader,
"multipart/form-data; boundary=" + boundary)
contentLength.foreach { cl =>
c.setFixedLengthStreamingMode(cl)
c.setRequestProperty(ContentLengthHeader, cl.toString)
}
var total = 0L
val os = c.getOutputStream
def writeMeta(s: String): Unit = {
os.write(s.getBytes(Iso88591))
total += s.getBytes(Iso88591).length.toLong
}
partsWithHeaders.foreach {
case (headers, p) =>
writeMeta(dashes)
writeMeta(boundary)
writeMeta(CrLf)
writeMeta(headers)
writeMeta(CrLf)
writeMeta(CrLf)
writeBasicBody(p.body, os)
writeMeta(CrLf)
}
// final boundary
writeMeta(dashes)
writeMeta(boundary)
writeMeta(dashes)
writeMeta(CrLf)
Some(os)
}
private def readResponse[T](
c: HttpURLConnection,
is: InputStream,
responseAs: ResponseAs[T, Nothing]): Response[T] = {
val headers = c.getHeaderFields.asScala.toVector
.filter(_._1 != null)
.flatMap { case (k, vv) => vv.asScala.map((k, _)) }
val contentEncoding = Option(c.getHeaderField(ContentEncodingHeader))
val charsetFromHeaders = Option(c.getHeaderField(ContentTypeHeader))
.flatMap(encodingFromContentType)
val code = c.getResponseCode
val wrappedIs = wrapInput(contentEncoding, handleNullInput(is))
val body = if (codeIsSuccess(code)) {
Right(readResponseBody(wrappedIs, responseAs, charsetFromHeaders))
} else {
Left(readResponseBody(wrappedIs, asString, charsetFromHeaders))
}
Response(body, code, headers, Nil)
}
private def readResponseBody[T](is: InputStream,
responseAs: ResponseAs[T, Nothing],
charset: Option[String]): T = {
def asString(enc: String) =
Source.fromInputStream(is, charset.getOrElse(enc)).mkString
responseAs match {
case MappedResponseAs(raw, g) => g(readResponseBody(is, raw, charset))
case IgnoreResponse =>
@tailrec def consume(): Unit = if (is.read() != -1) consume()
consume()
case ResponseAsString(enc) =>
asString(enc)
case ResponseAsByteArray =>
toByteArray(is)
case ResponseAsStream() =>
// only possible when the user requests the response as a stream of
// Nothing. Oh well ...
throw new IllegalStateException()
case ResponseAsFile(output, overwrite) =>
ResponseAs.saveFile(output, is, overwrite)
}
}
private def handleNullInput(is: InputStream): InputStream =
if (is == null)
new ByteArrayInputStream(Array.empty[Byte])
else
is
private def wrapInput(contentEncoding: Option[String],
is: InputStream): InputStream =
contentEncoding.map(_.toLowerCase) match {
case None => is
case Some("gzip") => new GZIPInputStream(is)
case Some("deflate") => new InflaterInputStream(is)
case Some(ce) =>
throw new UnsupportedEncodingException(s"Unsupported encoding: $ce")
}
override def close(): Unit = {}
}
object HttpURLConnectionBackend {
def apply(options: SttpBackendOptions = SttpBackendOptions.Default,
customizeConnection: HttpURLConnection => Unit = { _ =>
()
}): SttpBackend[Id, Nothing] =
new FollowRedirectsBackend[Id, Nothing](
new HttpURLConnectionBackend(options, customizeConnection))
}
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