1 files changed, 88 insertions, 0 deletions
diff --git a/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/parser/PrefaceParser.java b/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/parser/PrefaceParser.java
new file mode 100644
index 0000000000..94c678b640
--- /dev/null
+++ b/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/parser/PrefaceParser.java
@@ -0,0 +1,88 @@
+//
+//  ========================================================================
+//  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.http2.ErrorCode;
+import org.eclipse.jetty.http2.frames.PrefaceFrame;
+import org.eclipse.jetty.util.BufferUtil;
+import org.eclipse.jetty.util.log.Log;
+import org.eclipse.jetty.util.log.Logger;
+
+public class PrefaceParser
+{
+    private static final Logger LOG = Log.getLogger(PrefaceParser.class);
+
+    private final Parser.Listener listener;
+    private int cursor;
+
+    public PrefaceParser(Parser.Listener listener)
+    {
+        this.listener = listener;
+    }
+
+    /**
+     * <p>Advances this parser after the {@link PrefaceFrame#PREFACE_PREAMBLE_BYTES}.</p>
+     * <p>This allows the HTTP/1.1 parser to parse the preamble of the preface,
+     * which is a legal HTTP/1.1 request, and this parser will parse the remaining
+     * bytes, that are not parseable by a HTTP/1.1 parser.</p>
+     */
+    protected void directUpgrade()
+    {
+        if (cursor != 0)
+            throw new IllegalStateException();
+        cursor = PrefaceFrame.PREFACE_PREAMBLE_BYTES.length;
+    }
+
+    public boolean parse(ByteBuffer buffer)
+    {
+        while (buffer.hasRemaining())
+        {
+            int currByte = buffer.get();
+            if (currByte != PrefaceFrame.PREFACE_BYTES[cursor])
+            {
+                BufferUtil.clear(buffer);
+                notifyConnectionFailure(ErrorCode.PROTOCOL_ERROR.code, "invalid_preface");
+                return false;
+            }
+            ++cursor;
+            if (cursor == PrefaceFrame.PREFACE_BYTES.length)
+            {
+                cursor = 0;
+                if (LOG.isDebugEnabled())
+                    LOG.debug("Parsed preface bytes from {}", buffer);
+                return true;
+            }
+        }
+        return false;
+    }
+
+    protected void notifyConnectionFailure(int error, String reason)
+    {
+        try
+        {
+            listener.onConnectionFailure(error, reason);
+        }
+        catch (Throwable x)
+        {
+            LOG.info("Failure while notifying listener " + listener, x);
+        }
+    }
+}