/*
 * Copyright (c) 2018, 2019, 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;
    }

    @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;
    }
}