| // |
| // ======================================================================== |
| // Copyright (c) 1995-2017 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.http2.ErrorCode; |
| import org.eclipse.jetty.http2.Flags; |
| import org.eclipse.jetty.http2.frames.FrameType; |
| import org.eclipse.jetty.io.ByteBufferPool; |
| import org.eclipse.jetty.util.BufferUtil; |
| import org.eclipse.jetty.util.log.Log; |
| import org.eclipse.jetty.util.log.Logger; |
| |
| public class ServerParser extends Parser |
| { |
| private static final Logger LOG = Log.getLogger(ServerParser.class); |
| |
| private final Listener listener; |
| private final PrefaceParser prefaceParser; |
| private State state = State.PREFACE; |
| private boolean notifyPreface = true; |
| |
| public ServerParser(ByteBufferPool byteBufferPool, Listener listener, int maxDynamicTableSize, int maxHeaderSize) |
| { |
| super(byteBufferPool, listener, maxDynamicTableSize, maxHeaderSize); |
| this.listener = listener; |
| this.prefaceParser = new PrefaceParser(listener); |
| } |
| |
| /** |
| * <p>A direct upgrade is an unofficial upgrade from HTTP/1.1 to HTTP/2.0.</p> |
| * <p>A direct upgrade is initiated when {@code org.eclipse.jetty.server.HttpConnection} |
| * sees a request with these bytes:</p> |
| * <pre> |
| * PRI * HTTP/2.0\r\n |
| * \r\n |
| * </pre> |
| * <p>This request is part of the HTTP/2.0 preface, indicating that a |
| * HTTP/2.0 client is attempting a h2c direct connection.</p> |
| * <p>This is not a standard HTTP/1.1 Upgrade path.</p> |
| */ |
| public void directUpgrade() |
| { |
| if (state != State.PREFACE) |
| throw new IllegalStateException(); |
| prefaceParser.directUpgrade(); |
| } |
| |
| /** |
| * <p>The standard HTTP/1.1 upgrade path.</p> |
| */ |
| public void standardUpgrade() |
| { |
| if (state != State.PREFACE) |
| throw new IllegalStateException(); |
| notifyPreface = false; |
| } |
| |
| @Override |
| public void parse(ByteBuffer buffer) |
| { |
| try |
| { |
| if (LOG.isDebugEnabled()) |
| LOG.debug("Parsing {}", buffer); |
| |
| while (true) |
| { |
| switch (state) |
| { |
| case PREFACE: |
| { |
| if (!prefaceParser.parse(buffer)) |
| return; |
| if (notifyPreface) |
| onPreface(); |
| state = State.SETTINGS; |
| break; |
| } |
| case SETTINGS: |
| { |
| if (!parseHeader(buffer)) |
| return; |
| if (getFrameType() != FrameType.SETTINGS.getType() || hasFlag(Flags.ACK)) |
| { |
| BufferUtil.clear(buffer); |
| notifyConnectionFailure(ErrorCode.PROTOCOL_ERROR.code, "invalid_preface"); |
| return; |
| } |
| if (!parseBody(buffer)) |
| return; |
| state = State.FRAMES; |
| break; |
| } |
| case FRAMES: |
| { |
| // Stay forever in the FRAMES state. |
| super.parse(buffer); |
| return; |
| } |
| default: |
| { |
| throw new IllegalStateException(); |
| } |
| } |
| } |
| } |
| catch (Throwable x) |
| { |
| LOG.debug(x); |
| BufferUtil.clear(buffer); |
| notifyConnectionFailure(ErrorCode.PROTOCOL_ERROR.code, "parser_error"); |
| } |
| } |
| |
| protected void onPreface() |
| { |
| notifyPreface(); |
| } |
| |
| private void notifyPreface() |
| { |
| try |
| { |
| listener.onPreface(); |
| } |
| catch (Throwable x) |
| { |
| LOG.info("Failure while notifying listener " + listener, x); |
| } |
| } |
| |
| public interface Listener extends Parser.Listener |
| { |
| public void onPreface(); |
| |
| public static class Adapter extends Parser.Listener.Adapter implements Listener |
| { |
| @Override |
| public void onPreface() |
| { |
| } |
| } |
| } |
| |
| private enum State |
| { |
| PREFACE, SETTINGS, FRAMES |
| } |
| } |