//
// ========================================================================
// Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.http2.parser;
import java.nio.ByteBuffer;
import org.eclipse.jetty.http.MetaData;
import org.eclipse.jetty.http2.ErrorCodes;
import org.eclipse.jetty.http2.Flags;
import org.eclipse.jetty.http2.frames.PushPromiseFrame;
public class PushPromiseBodyParser extends BodyParser
{
private final HeaderBlockParser headerBlockParser;
private State state = State.PREPARE;
private int cursor;
private int length;
private int paddingLength;
private int streamId;
public PushPromiseBodyParser(HeaderParser headerParser, Parser.Listener listener, HeaderBlockParser headerBlockParser)
{
super(headerParser, listener);
this.headerBlockParser = headerBlockParser;
}
private void reset()
{
state = State.PREPARE;
cursor = 0;
length = 0;
paddingLength = 0;
streamId = 0;
}
@Override
public Result parse(ByteBuffer buffer)
{
boolean loop = false;
while (buffer.hasRemaining() || loop)
{
switch (state)
{
case PREPARE:
{
// SPEC: wrong streamId is treated as connection error.
if (getStreamId() == 0)
{
return notifyConnectionFailure(ErrorCodes.PROTOCOL_ERROR, "invalid_push_promise_frame");
}
// For now we don't support PUSH_PROMISE frames that don't have END_HEADERS.
if (!hasFlag(Flags.END_HEADERS))
{
return notifyConnectionFailure(ErrorCodes.INTERNAL_ERROR, "unsupported_push_promise_frame");
}
length = getBodyLength();
if (isPadding())
{
state = State.PADDING_LENGTH;
}
else
{
state = State.STREAM_ID;
}
break;
}
case PADDING_LENGTH:
{
paddingLength = buffer.get() & 0xFF;
--length;
length -= paddingLength;
state = State.STREAM_ID;
if (length < 4)
{
return notifyConnectionFailure(ErrorCodes.FRAME_SIZE_ERROR, "invalid_push_promise_frame");
}
break;
}
case STREAM_ID:
{
if (buffer.remaining() >= 4)
{
streamId = buffer.getInt();
streamId &= 0x7F_FF_FF_FF;
length -= 4;
state = State.HEADERS;
loop = length == 0;
}
else
{
state = State.STREAM_ID_BYTES;
cursor = 4;
}
break;
}
case STREAM_ID_BYTES:
{
int currByte = buffer.get() & 0xFF;
--cursor;
streamId += currByte << (8 * cursor);
--length;
if (cursor > 0 && length <= 0)
{
return notifyConnectionFailure(ErrorCodes.FRAME_SIZE_ERROR, "invalid_push_promise_frame");
}
if (cursor == 0)
{
streamId &= 0x7F_FF_FF_FF;
state = State.HEADERS;
loop = length == 0;
}
break;
}
case HEADERS:
{
MetaData metaData = headerBlockParser.parse(buffer, length);
if (metaData != null)
{
state = State.PADDING;
loop = paddingLength == 0;
if (onPushPromise(streamId, metaData))
{
return Result.ASYNC;
}
}
break;
}
case PADDING:
{
int size = Math.min(buffer.remaining(), paddingLength);
buffer.position(buffer.position() + size);
paddingLength -= size;
if (paddingLength == 0)
{
reset();
return Result.COMPLETE;
}
break;
}
default:
{
throw new IllegalStateException();
}
}
}
return Result.PENDING;
}
private boolean onPushPromise(int streamId, MetaData metaData)
{
PushPromiseFrame frame = new PushPromiseFrame(getStreamId(), streamId, metaData);
return notifyPushPromise(frame);
}
private enum State
{
PREPARE, PADDING_LENGTH, STREAM_ID, STREAM_ID_BYTES, HEADERS, PADDING
}
}