| // |
| // ======================================================================== |
| // 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.spdy.parser; |
| |
| import java.nio.ByteBuffer; |
| |
| import org.eclipse.jetty.spdy.CompressionFactory; |
| import org.eclipse.jetty.spdy.PushSynInfo; |
| import org.eclipse.jetty.spdy.StreamException; |
| import org.eclipse.jetty.spdy.api.SPDY; |
| import org.eclipse.jetty.spdy.api.StreamStatus; |
| import org.eclipse.jetty.spdy.api.SynInfo; |
| import org.eclipse.jetty.spdy.frames.ControlFrameType; |
| import org.eclipse.jetty.spdy.frames.SynStreamFrame; |
| import org.eclipse.jetty.util.Fields; |
| |
| public class SynStreamBodyParser extends ControlFrameBodyParser |
| { |
| private final Fields headers = new Fields(); |
| private final ControlFrameParser controlFrameParser; |
| private final HeadersBlockParser headersBlockParser; |
| private State state = State.STREAM_ID; |
| private int cursor; |
| private int streamId; |
| private int associatedStreamId; |
| private byte priority; |
| private short slot; |
| |
| public SynStreamBodyParser(CompressionFactory.Decompressor decompressor, ControlFrameParser controlFrameParser) |
| { |
| this.controlFrameParser = controlFrameParser; |
| this.headersBlockParser = new SynStreamHeadersBlockParser(decompressor); |
| } |
| |
| @Override |
| public boolean parse(ByteBuffer buffer) |
| { |
| while (buffer.hasRemaining()) |
| { |
| switch (state) |
| { |
| case STREAM_ID: |
| { |
| if (buffer.remaining() >= 4) |
| { |
| streamId = buffer.getInt() & 0x7F_FF_FF_FF; |
| state = State.ASSOCIATED_STREAM_ID; |
| } |
| else |
| { |
| state = State.STREAM_ID_BYTES; |
| cursor = 4; |
| } |
| break; |
| } |
| case STREAM_ID_BYTES: |
| { |
| byte currByte = buffer.get(); |
| --cursor; |
| streamId += (currByte & 0xFF) << 8 * cursor; |
| if (cursor == 0) |
| { |
| streamId &= 0x7F_FF_FF_FF; |
| state = State.ASSOCIATED_STREAM_ID; |
| } |
| break; |
| } |
| case ASSOCIATED_STREAM_ID: |
| { |
| // Now we know the streamId, we can do the version check |
| // and if it is wrong, issue a RST_STREAM |
| try |
| { |
| checkVersion(controlFrameParser.getVersion(), streamId); |
| } |
| catch (StreamException e) |
| { |
| // We've already read 4 bytes of the streamId which are part of controlFrameParser.getLength |
| // so we need to substract those from the bytesToSkip. |
| int bytesToSkip = controlFrameParser.getLength() - 4; |
| int remaining = buffer.remaining(); |
| if (remaining >= bytesToSkip) |
| { |
| buffer.position(buffer.position() + bytesToSkip); |
| controlFrameParser.reset(); |
| reset(); |
| } |
| else |
| { |
| int bytesToSkipInNextBuffer = bytesToSkip - remaining; |
| buffer.position(buffer.limit()); |
| controlFrameParser.skip(bytesToSkipInNextBuffer); |
| reset(); |
| } |
| throw e; |
| } |
| if (buffer.remaining() >= 4) |
| { |
| associatedStreamId = buffer.getInt() & 0x7F_FF_FF_FF; |
| state = State.PRIORITY; |
| } |
| else |
| { |
| state = State.ASSOCIATED_STREAM_ID_BYTES; |
| cursor = 4; |
| } |
| break; |
| } |
| case ASSOCIATED_STREAM_ID_BYTES: |
| { |
| byte currByte = buffer.get(); |
| --cursor; |
| associatedStreamId += (currByte & 0xFF) << 8 * cursor; |
| if (cursor == 0) |
| { |
| associatedStreamId &= 0x7F_FF_FF_FF; |
| state = State.PRIORITY; |
| } |
| break; |
| } |
| case PRIORITY: |
| { |
| byte currByte = buffer.get(); |
| ++cursor; |
| if (cursor == 1) |
| { |
| priority = readPriority(controlFrameParser.getVersion(), currByte); |
| } |
| else |
| { |
| slot = (short)(currByte & 0xFF); |
| cursor = 0; |
| state = State.HEADERS; |
| } |
| break; |
| } |
| case HEADERS: |
| { |
| short version = controlFrameParser.getVersion(); |
| int length = controlFrameParser.getLength() - 10; |
| if (headersBlockParser.parse(streamId, version, length, buffer)) |
| { |
| byte flags = controlFrameParser.getFlags(); |
| if (flags > (SynInfo.FLAG_CLOSE | PushSynInfo.FLAG_UNIDIRECTIONAL)) |
| throw new IllegalArgumentException("Invalid flag " + flags + " for frame " + |
| ControlFrameType.SYN_STREAM); |
| |
| SynStreamFrame frame = new SynStreamFrame(version, flags, streamId, associatedStreamId, |
| priority, slot, new Fields(headers, false)); |
| controlFrameParser.onControlFrame(frame); |
| |
| reset(); |
| return true; |
| } |
| break; |
| } |
| default: |
| { |
| throw new IllegalStateException(); |
| } |
| } |
| } |
| return false; |
| } |
| |
| private void checkVersion(short version, int streamId) |
| { |
| if (version != SPDY.V2 && version != SPDY.V3) |
| throw new StreamException(streamId, StreamStatus.UNSUPPORTED_VERSION); |
| } |
| |
| private byte readPriority(short version, byte currByte) |
| { |
| // Right shift retains the sign bit when operated on a byte, |
| // so we use an int to perform the shifts |
| switch (version) |
| { |
| case SPDY.V2: |
| int p2 = currByte & 0b1100_0000; |
| p2 >>>= 6; |
| return (byte)p2; |
| case SPDY.V3: |
| int p3 = currByte & 0b1110_0000; |
| p3 >>>= 5; |
| return (byte)p3; |
| default: |
| throw new IllegalStateException(); |
| } |
| } |
| |
| private void reset() |
| { |
| headers.clear(); |
| state = State.STREAM_ID; |
| cursor = 0; |
| streamId = 0; |
| associatedStreamId = 0; |
| priority = 0; |
| } |
| |
| private enum State |
| { |
| STREAM_ID, STREAM_ID_BYTES, ASSOCIATED_STREAM_ID, ASSOCIATED_STREAM_ID_BYTES, PRIORITY, HEADERS |
| } |
| |
| private class SynStreamHeadersBlockParser extends HeadersBlockParser |
| { |
| public SynStreamHeadersBlockParser(CompressionFactory.Decompressor decompressor) |
| { |
| super(decompressor); |
| } |
| |
| @Override |
| protected void onHeader(String name, String[] values) |
| { |
| for (String value : values) |
| headers.add(name, value); |
| } |
| } |
| } |