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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.http1
import java.io.EOFException
import java.io.IOException
import java.net.ProtocolException
import java.util.concurrent.TimeUnit.MILLISECONDS
import okhttp3.Headers
import okhttp3.HttpUrl
import okhttp3.OkHttpClient
import okhttp3.Request
import okhttp3.Response
import okhttp3.internal.EMPTY_HEADERS
import okhttp3.internal.checkOffsetAndCount
import okhttp3.internal.connection.RealConnection
import okhttp3.internal.discard
import okhttp3.internal.headersContentLength
import okhttp3.internal.http.ExchangeCodec
import okhttp3.internal.http.RequestLine
import okhttp3.internal.http.StatusLine
import okhttp3.internal.http.StatusLine.Companion.HTTP_CONTINUE
import okhttp3.internal.http.promisesBody
import okhttp3.internal.http.receiveHeaders
import okhttp3.internal.skipAll
import okio.Buffer
import okio.BufferedSink
import okio.BufferedSource
import okio.ForwardingTimeout
import okio.Sink
import okio.Source
import okio.Timeout
/**
* A socket connection that can be used to send HTTP/1.1 messages. This class strictly enforces the
* following lifecycle:
*
* 1. [Send request headers][writeRequest].
* 2. Open a sink to write the request body. Either [known][newKnownLengthSink] or
* [chunked][newChunkedSink].
* 3. Write to and then close that sink.
* 4. [Read response headers][readResponseHeaders].
* 5. Open a source to read the response body. Either [fixed-length][newFixedLengthSource],
* [chunked][newChunkedSource] or [unknown][newUnknownLengthSource].
* 6. Read from and close that source.
*
* Exchanges that do not have a request body may skip creating and closing the request body.
* Exchanges that do not have a response body can call
* [newFixedLengthSource(0)][newFixedLengthSource] and may skip reading and closing that source.
*/
class Http1ExchangeCodec(
/** The client that configures this stream. May be null for HTTPS proxy tunnels. */
private val client: OkHttpClient?,
/** The connection that carries this stream. */
override val connection: RealConnection,
private val source: BufferedSource,
private val sink: BufferedSink
) : ExchangeCodec {
private var state = STATE_IDLE
private var headerLimit = HEADER_LIMIT.toLong()
private val Response.isChunked: Boolean
get() = "chunked".equals(header("Transfer-Encoding"), ignoreCase = true)
private val Request.isChunked: Boolean
get() = "chunked".equals(header("Transfer-Encoding"), ignoreCase = true)
/**
* Received trailers. Null unless the response body uses chunked transfer-encoding and includes
* trailers. Undefined until the end of the response body.
*/
private var trailers: Headers? = null
/** Returns true if this connection is closed. */
val isClosed: Boolean
get() = state == STATE_CLOSED
override fun createRequestBody(request: Request, contentLength: Long): Sink {
return when {
request.body != null && request.body.isDuplex() -> throw ProtocolException(
"Duplex connections are not supported for HTTP/1")
request.isChunked -> newChunkedSink() // Stream a request body of unknown length.
contentLength != -1L -> newKnownLengthSink() // Stream a request body of a known length.
else -> // Stream a request body of a known length.
throw IllegalStateException(
"Cannot stream a request body without chunked encoding or a known content length!")
}
}
override fun cancel() {
connection.cancel()
}
/**
* Prepares the HTTP headers and sends them to the server.
*
* For streaming requests with a body, headers must be prepared **before** the output stream has
* been written to. Otherwise the body would need to be buffered!
*
* For non-streaming requests with a body, headers must be prepared **after** the output stream
* has been written to and closed. This ensures that the `Content-Length` header field receives
* the proper value.
*/
override fun writeRequestHeaders(request: Request) {
val requestLine = RequestLine.get(request, connection.route().proxy.type())
writeRequest(request.headers, requestLine)
}
override fun reportedContentLength(response: Response): Long {
return when {
!response.promisesBody() -> 0L
response.isChunked -> -1L
else -> response.headersContentLength()
}
}
override fun openResponseBodySource(response: Response): Source {
return when {
!response.promisesBody() -> newFixedLengthSource(0)
response.isChunked -> newChunkedSource(response.request.url)
else -> {
val contentLength = response.headersContentLength()
if (contentLength != -1L) {
newFixedLengthSource(contentLength)
} else {
newUnknownLengthSource()
}
}
}
}
override fun trailers(): Headers {
check(state == STATE_CLOSED) { "too early; can't read the trailers yet" }
return trailers ?: EMPTY_HEADERS
}
override fun flushRequest() {
sink.flush()
}
override fun finishRequest() {
sink.flush()
}
/** Returns bytes of a request header for sending on an HTTP transport. */
fun writeRequest(headers: Headers, requestLine: String) {
check(state == STATE_IDLE) { "state: $state" }
sink.writeUtf8(requestLine).writeUtf8("\r\n")
for (i in 0 until headers.size) {
sink.writeUtf8(headers.name(i))
.writeUtf8(": ")
.writeUtf8(headers.value(i))
.writeUtf8("\r\n")
}
sink.writeUtf8("\r\n")
state = STATE_OPEN_REQUEST_BODY
}
override fun readResponseHeaders(expectContinue: Boolean): Response.Builder? {
check(state == STATE_OPEN_REQUEST_BODY || state == STATE_READ_RESPONSE_HEADERS) {
"state: $state"
}
try {
val statusLine = StatusLine.parse(readHeaderLine())
val responseBuilder = Response.Builder()
.protocol(statusLine.protocol)
.code(statusLine.code)
.message(statusLine.message)
.headers(readHeaders())
return when {
expectContinue && statusLine.code == HTTP_CONTINUE -> {
null
}
statusLine.code == HTTP_CONTINUE -> {
state = STATE_READ_RESPONSE_HEADERS
responseBuilder
}
else -> {
state = STATE_OPEN_RESPONSE_BODY
responseBuilder
}
}
} catch (e: EOFException) {
// Provide more context if the server ends the stream before sending a response.
val address = connection.route().address.url.redact()
throw IOException("unexpected end of stream on $address", e)
}
}
private fun readHeaderLine(): String {
val line = source.readUtf8LineStrict(headerLimit)
headerLimit -= line.length.toLong()
return line
}
/** Reads headers or trailers. */
private fun readHeaders(): Headers {
val headers = Headers.Builder()
// parse the result headers until the first blank line
var line = readHeaderLine()
while (line.isNotEmpty()) {
headers.addLenient(line)
line = readHeaderLine()
}
return headers.build()
}
private fun newChunkedSink(): Sink {
check(state == STATE_OPEN_REQUEST_BODY) { "state: $state" }
state = STATE_WRITING_REQUEST_BODY
return ChunkedSink()
}
private fun newKnownLengthSink(): Sink {
check(state == STATE_OPEN_REQUEST_BODY) { "state: $state" }
state = STATE_WRITING_REQUEST_BODY
return KnownLengthSink()
}
private fun newFixedLengthSource(length: Long): Source {
check(state == STATE_OPEN_RESPONSE_BODY) { "state: $state" }
state = STATE_READING_RESPONSE_BODY
return FixedLengthSource(length)
}
private fun newChunkedSource(url: HttpUrl): Source {
check(state == STATE_OPEN_RESPONSE_BODY) { "state: $state" }
state = STATE_READING_RESPONSE_BODY
return ChunkedSource(url)
}
private fun newUnknownLengthSource(): Source {
check(state == STATE_OPEN_RESPONSE_BODY) { "state: $state" }
state = STATE_READING_RESPONSE_BODY
connection.noNewExchanges()
return UnknownLengthSource()
}
/**
* Sets the delegate of `timeout` to [Timeout.NONE] and resets its underlying timeout
* to the default configuration. Use this to avoid unexpected sharing of timeouts between pooled
* connections.
*/
private fun detachTimeout(timeout: ForwardingTimeout) {
val oldDelegate = timeout.delegate
timeout.setDelegate(Timeout.NONE)
oldDelegate.clearDeadline()
oldDelegate.clearTimeout()
}
/**
* The response body from a CONNECT should be empty, but if it is not then we should consume it
* before proceeding.
*/
fun skipConnectBody(response: Response) {
val contentLength = response.headersContentLength()
if (contentLength == -1L) return
val body = newFixedLengthSource(contentLength)
body.skipAll(Int.MAX_VALUE, MILLISECONDS)
body.close()
}
/** An HTTP request body. */
private inner class KnownLengthSink : Sink {
private val timeout = ForwardingTimeout(sink.timeout())
private var closed: Boolean = false
override fun timeout(): Timeout = timeout
override fun write(source: Buffer, byteCount: Long) {
check(!closed) { "closed" }
checkOffsetAndCount(source.size, 0, byteCount)
sink.write(source, byteCount)
}
override fun flush() {
if (closed) return // Don't throw; this stream might have been closed on the caller's behalf.
sink.flush()
}
override fun close() {
if (closed) return
closed = true
detachTimeout(timeout)
state = STATE_READ_RESPONSE_HEADERS
}
}
/**
* An HTTP body with alternating chunk sizes and chunk bodies. It is the caller's responsibility
* to buffer chunks; typically by using a buffered sink with this sink.
*/
private inner class ChunkedSink : Sink {
private val timeout = ForwardingTimeout(sink.timeout())
private var closed: Boolean = false
override fun timeout(): Timeout = timeout
override fun write(source: Buffer, byteCount: Long) {
check(!closed) { "closed" }
if (byteCount == 0L) return
sink.writeHexadecimalUnsignedLong(byteCount)
sink.writeUtf8("\r\n")
sink.write(source, byteCount)
sink.writeUtf8("\r\n")
}
@Synchronized
override fun flush() {
if (closed) return // Don't throw; this stream might have been closed on the caller's behalf.
sink.flush()
}
@Synchronized
override fun close() {
if (closed) return
closed = true
sink.writeUtf8("0\r\n\r\n")
detachTimeout(timeout)
state = STATE_READ_RESPONSE_HEADERS
}
}
private abstract inner class AbstractSource : Source {
protected val timeout = ForwardingTimeout(source.timeout())
protected var closed: Boolean = false
override fun timeout(): Timeout = timeout
override fun read(sink: Buffer, byteCount: Long): Long {
return try {
source.read(sink, byteCount)
} catch (e: IOException) {
connection.noNewExchanges()
responseBodyComplete()
throw e
}
}
/**
* Closes the cache entry and makes the socket available for reuse. This should be invoked when
* the end of the body has been reached.
*/
internal fun responseBodyComplete() {
if (state == STATE_CLOSED) return
if (state != STATE_READING_RESPONSE_BODY) throw IllegalStateException("state: $state")
detachTimeout(timeout)
state = STATE_CLOSED
}
}
/** An HTTP body with a fixed length specified in advance. */
private inner class FixedLengthSource internal constructor(private var bytesRemaining: Long) :
AbstractSource() {
init {
if (bytesRemaining == 0L) {
responseBodyComplete()
}
}
override fun read(sink: Buffer, byteCount: Long): Long {
require(byteCount >= 0L) { "byteCount < 0: $byteCount" }
check(!closed) { "closed" }
if (bytesRemaining == 0L) return -1
val read = super.read(sink, minOf(bytesRemaining, byteCount))
if (read == -1L) {
connection.noNewExchanges() // The server didn't supply the promised content length.
val e = ProtocolException("unexpected end of stream")
responseBodyComplete()
throw e
}
bytesRemaining -= read
if (bytesRemaining == 0L) {
responseBodyComplete()
}
return read
}
override fun close() {
if (closed) return
if (bytesRemaining != 0L &&
!discard(ExchangeCodec.DISCARD_STREAM_TIMEOUT_MILLIS, MILLISECONDS)) {
connection.noNewExchanges() // Unread bytes remain on the stream.
responseBodyComplete()
}
closed = true
}
}
/** An HTTP body with alternating chunk sizes and chunk bodies. */
private inner class ChunkedSource internal constructor(private val url: HttpUrl) :
AbstractSource() {
private var bytesRemainingInChunk = NO_CHUNK_YET
private var hasMoreChunks = true
override fun read(sink: Buffer, byteCount: Long): Long {
require(byteCount >= 0L) { "byteCount < 0: $byteCount" }
check(!closed) { "closed" }
if (!hasMoreChunks) return -1
if (bytesRemainingInChunk == 0L || bytesRemainingInChunk == NO_CHUNK_YET) {
readChunkSize()
if (!hasMoreChunks) return -1
}
val read = super.read(sink, minOf(byteCount, bytesRemainingInChunk))
if (read == -1L) {
connection.noNewExchanges() // The server didn't supply the promised chunk length.
val e = ProtocolException("unexpected end of stream")
responseBodyComplete()
throw e
}
bytesRemainingInChunk -= read
return read
}
private fun readChunkSize() {
// Read the suffix of the previous chunk.
if (bytesRemainingInChunk != NO_CHUNK_YET) {
source.readUtf8LineStrict()
}
try {
bytesRemainingInChunk = source.readHexadecimalUnsignedLong()
val extensions = source.readUtf8LineStrict().trim()
if (bytesRemainingInChunk < 0L || extensions.isNotEmpty() && !extensions.startsWith(";")) {
throw ProtocolException("expected chunk size and optional extensions" +
" but was \"$bytesRemainingInChunk$extensions\"")
}
} catch (e: NumberFormatException) {
throw ProtocolException(e.message)
}
if (bytesRemainingInChunk == 0L) {
hasMoreChunks = false
trailers = readHeaders()
client!!.cookieJar.receiveHeaders(url, trailers!!)
responseBodyComplete()
}
}
override fun close() {
if (closed) return
if (hasMoreChunks &&
!discard(ExchangeCodec.DISCARD_STREAM_TIMEOUT_MILLIS, MILLISECONDS)) {
connection.noNewExchanges() // Unread bytes remain on the stream.
responseBodyComplete()
}
closed = true
}
}
/** An HTTP message body terminated by the end of the underlying stream. */
private inner class UnknownLengthSource : AbstractSource() {
private var inputExhausted: Boolean = false
override fun read(sink: Buffer, byteCount: Long): Long {
require(byteCount >= 0L) { "byteCount < 0: $byteCount" }
check(!closed) { "closed" }
if (inputExhausted) return -1
val read = super.read(sink, byteCount)
if (read == -1L) {
inputExhausted = true
responseBodyComplete()
return -1
}
return read
}
override fun close() {
if (closed) return
if (!inputExhausted) {
responseBodyComplete()
}
closed = true
}
}
companion object {
private const val NO_CHUNK_YET = -1L
private const val STATE_IDLE = 0 // Idle connections are ready to write request headers.
private const val STATE_OPEN_REQUEST_BODY = 1
private const val STATE_WRITING_REQUEST_BODY = 2
private const val STATE_READ_RESPONSE_HEADERS = 3
private const val STATE_OPEN_RESPONSE_BODY = 4
private const val STATE_READING_RESPONSE_BODY = 5
private const val STATE_CLOSED = 6
private const val HEADER_LIMIT = 256 * 1024
}
}
