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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package okhttp3.internal.http2
import java.io.IOException
import java.net.ProtocolException
import java.util.Locale
import java.util.concurrent.TimeUnit
import okhttp3.Headers
import okhttp3.OkHttpClient
import okhttp3.Protocol
import okhttp3.Request
import okhttp3.Response
import okhttp3.internal.headersContentLength
import okhttp3.internal.http.ExchangeCodec
import okhttp3.internal.http.ExchangeCodec.Carrier
import okhttp3.internal.http.HTTP_CONTINUE
import okhttp3.internal.http.RealInterceptorChain
import okhttp3.internal.http.RequestLine
import okhttp3.internal.http.StatusLine
import okhttp3.internal.http.promisesBody
import okhttp3.internal.http2.Header.Companion.RESPONSE_STATUS_UTF8
import okhttp3.internal.http2.Header.Companion.TARGET_AUTHORITY
import okhttp3.internal.http2.Header.Companion.TARGET_AUTHORITY_UTF8
import okhttp3.internal.http2.Header.Companion.TARGET_METHOD
import okhttp3.internal.http2.Header.Companion.TARGET_METHOD_UTF8
import okhttp3.internal.http2.Header.Companion.TARGET_PATH
import okhttp3.internal.http2.Header.Companion.TARGET_PATH_UTF8
import okhttp3.internal.http2.Header.Companion.TARGET_SCHEME
import okhttp3.internal.http2.Header.Companion.TARGET_SCHEME_UTF8
import okhttp3.internal.immutableListOf
import okhttp3.internal.lowercase
import okio.Sink
import okio.Source
/** Encode requests and responses using HTTP/2 frames. */
class Http2ExchangeCodec(
client: OkHttpClient,
override val carrier: Carrier,
private val chain: RealInterceptorChain,
private val http2Connection: Http2Connection
) : ExchangeCodec {
@Volatile private var stream: Http2Stream? = null
private val protocol: Protocol = if (Protocol.H2_PRIOR_KNOWLEDGE in client.protocols) {
Protocol.H2_PRIOR_KNOWLEDGE
} else {
Protocol.HTTP_2
}
@Volatile
private var canceled = false
override fun createRequestBody(request: Request, contentLength: Long): Sink {
return stream!!.getSink()
}
override fun writeRequestHeaders(request: Request) {
if (stream != null) return
val hasRequestBody = request.body != null
val requestHeaders = http2HeadersList(request)
stream = http2Connection.newStream(requestHeaders, hasRequestBody)
// We may have been asked to cancel while creating the new stream and sending the request
// headers, but there was still no stream to close.
if (canceled) {
stream!!.closeLater(ErrorCode.CANCEL)
throw IOException("Canceled")
}
stream!!.readTimeout().timeout(chain.readTimeoutMillis.toLong(), TimeUnit.MILLISECONDS)
stream!!.writeTimeout().timeout(chain.writeTimeoutMillis.toLong(), TimeUnit.MILLISECONDS)
}
override fun flushRequest() {
http2Connection.flush()
}
override fun finishRequest() {
stream!!.getSink().close()
}
override fun readResponseHeaders(expectContinue: Boolean): Response.Builder? {
val stream = stream ?: throw IOException("stream wasn't created")
val headers = stream.takeHeaders(callerIsIdle = expectContinue)
val responseBuilder = readHttp2HeadersList(headers, protocol)
return if (expectContinue && responseBuilder.code == HTTP_CONTINUE) {
null
} else {
responseBuilder
}
}
override fun reportedContentLength(response: Response): Long {
return when {
!response.promisesBody() -> 0L
else -> response.headersContentLength()
}
}
override fun openResponseBodySource(response: Response): Source {
return stream!!.source
}
override fun trailers(): Headers {
return stream!!.trailers()
}
override fun cancel() {
canceled = true
stream?.closeLater(ErrorCode.CANCEL)
}
companion object {
private const val CONNECTION = "connection"
private const val HOST = "host"
private const val KEEP_ALIVE = "keep-alive"
private const val PROXY_CONNECTION = "proxy-connection"
private const val TRANSFER_ENCODING = "transfer-encoding"
private const val TE = "te"
private const val ENCODING = "encoding"
private const val UPGRADE = "upgrade"
/** See http://tools.ietf.org/html/draft-ietf-httpbis-http2-09#section-8.1.3. */
private val HTTP_2_SKIPPED_REQUEST_HEADERS = immutableListOf(
CONNECTION,
HOST,
KEEP_ALIVE,
PROXY_CONNECTION,
TE,
TRANSFER_ENCODING,
ENCODING,
UPGRADE,
TARGET_METHOD_UTF8,
TARGET_PATH_UTF8,
TARGET_SCHEME_UTF8,
TARGET_AUTHORITY_UTF8)
private val HTTP_2_SKIPPED_RESPONSE_HEADERS = immutableListOf(
CONNECTION,
HOST,
KEEP_ALIVE,
PROXY_CONNECTION,
TE,
TRANSFER_ENCODING,
ENCODING,
UPGRADE)
fun http2HeadersList(request: Request): List {
val headers = request.headers
val result = ArrayList(headers.size + 4)
result.add(Header(TARGET_METHOD, request.method))
result.add(Header(TARGET_PATH, RequestLine.requestPath(request.url)))
val host = request.header("Host")
if (host != null) {
result.add(Header(TARGET_AUTHORITY, host)) // Optional.
}
result.add(Header(TARGET_SCHEME, request.url.scheme))
for (i in 0 until headers.size) {
// header names must be lowercase.
val name = headers.name(i).lowercase(Locale.US)
if (name !in HTTP_2_SKIPPED_REQUEST_HEADERS ||
name == TE && headers.value(i) == "trailers") {
result.add(Header(name, headers.value(i)))
}
}
return result
}
/** Returns headers for a name value block containing an HTTP/2 response. */
fun readHttp2HeadersList(headerBlock: Headers, protocol: Protocol): Response.Builder {
var statusLine: StatusLine? = null
val headersBuilder = Headers.Builder()
for (i in 0 until headerBlock.size) {
val name = headerBlock.name(i)
val value = headerBlock.value(i)
if (name == RESPONSE_STATUS_UTF8) {
statusLine = StatusLine.parse("HTTP/1.1 $value")
} else if (name !in HTTP_2_SKIPPED_RESPONSE_HEADERS) {
headersBuilder.addLenient(name, value)
}
}
if (statusLine == null) throw ProtocolException("Expected ':status' header not present")
return Response.Builder()
.protocol(protocol)
.code(statusLine.code)
.message(statusLine.message)
.headers(headersBuilder.build())
.trailers { error("trailers not available") }
}
}
}
