| // |
| // ======================================================================== |
| // Copyright (c) 1995-2016 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.ErrorCode; |
| 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 boolean 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 connectionFailure(buffer, ErrorCode.PROTOCOL_ERROR.code, "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 connectionFailure(buffer, ErrorCode.INTERNAL_ERROR.code, "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 connectionFailure(buffer, ErrorCode.FRAME_SIZE_ERROR.code, "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 connectionFailure(buffer, ErrorCode.FRAME_SIZE_ERROR.code, "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; |
| onPushPromise(streamId, metaData); |
| } |
| break; |
| } |
| case PADDING: |
| { |
| int size = Math.min(buffer.remaining(), paddingLength); |
| buffer.position(buffer.position() + size); |
| paddingLength -= size; |
| if (paddingLength == 0) |
| { |
| reset(); |
| return true; |
| } |
| break; |
| } |
| default: |
| { |
| throw new IllegalStateException(); |
| } |
| } |
| } |
| return false; |
| } |
| |
| private void onPushPromise(int streamId, MetaData metaData) |
| { |
| PushPromiseFrame frame = new PushPromiseFrame(getStreamId(), streamId, metaData); |
| notifyPushPromise(frame); |
| } |
| |
| private enum State |
| { |
| PREPARE, PADDING_LENGTH, STREAM_ID, STREAM_ID_BYTES, HEADERS, PADDING |
| } |
| } |