/*

 * Copyright (c) 2018, 2020, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.security.ssl;

import java.io.IOException;

import java.nio.BufferOverflowException;

import java.nio.BufferUnderflowException;

import java.nio.ByteBuffer;

import java.util.ArrayList;

/**

 * A compact implementation of HandshakeContext for post-handshake messages

 */

final class PostHandshakeContext extends HandshakeContext {

    PostHandshakeContext(TransportContext context) throws IOException {

        super(context);

        if (!negotiatedProtocol.useTLS13PlusSpec()) {

            throw conContext.fatal(Alert.UNEXPECTED_MESSAGE,

                "Post-handshake not supported in " + negotiatedProtocol.name);

        }

        this.localSupportedSignAlgs = new ArrayList<>(

            context.conSession.getLocalSupportedSignatureSchemes());

        // Add the potential post-handshake consumers.

        if (context.sslConfig.isClientMode) {

            handshakeConsumers.putIfAbsent(

                    SSLHandshake.KEY_UPDATE.id,

                    SSLHandshake.KEY_UPDATE);

            handshakeConsumers.putIfAbsent(

                    SSLHandshake.NEW_SESSION_TICKET.id,

                    SSLHandshake.NEW_SESSION_TICKET);

        } else {

            handshakeConsumers.putIfAbsent(

                    SSLHandshake.KEY_UPDATE.id,

                    SSLHandshake.KEY_UPDATE);

        }

        handshakeFinished = true;

        handshakeSession = context.conSession;

    }

    @Override

    void kickstart() throws IOException {

        SSLHandshake.kickstart(this);

    }

    @Override

    void dispatch(byte handshakeType, ByteBuffer fragment) throws IOException {

        SSLConsumer consumer = handshakeConsumers.get(handshakeType);

        if (consumer == null) {

            throw conContext.fatal(Alert.UNEXPECTED_MESSAGE,

                    "Unexpected post-handshake message: " +

                            SSLHandshake.nameOf(handshakeType));

        }

        try {

            consumer.consume(this, fragment);

        } catch (UnsupportedOperationException unsoe) {

            throw conContext.fatal(Alert.UNEXPECTED_MESSAGE,

                    "Unsupported post-handshake message: " +

                            SSLHandshake.nameOf(handshakeType), unsoe);

        } catch (BufferUnderflowException | BufferOverflowException be) {

            throw conContext.fatal(Alert.DECODE_ERROR,

                    "Illegal handshake message: " +

                    SSLHandshake.nameOf(handshakeType), be);

        }

    }

    static boolean isConsumable(TransportContext context, byte handshakeType) {

        if (handshakeType == SSLHandshake.KEY_UPDATE.id) {

            // The KeyUpdate handshake message does not apply to TLS 1.2 and

            // previous protocols.

            return context.protocolVersion.useTLS13PlusSpec();

        }

        if (handshakeType == SSLHandshake.NEW_SESSION_TICKET.id) {

            // The new session ticket handshake message could be consumer in

            // client side only.

            return context.sslConfig.isClientMode;

        }

        // No more post-handshake message supported currently.

        return false;

    }

}