/*

 * Copyright (c) 2018, 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.ByteBuffer;

import java.text.MessageFormat;

import java.util.Locale;

import sun.security.ssl.SSLHandshake.HandshakeMessage;

/**

 * Pack of the EncryptedExtensions handshake message.

 */

final class EncryptedExtensions {

    static final HandshakeProducer handshakeProducer =

        new EncryptedExtensionsProducer();

    static final SSLConsumer handshakeConsumer =

        new EncryptedExtensionsConsumer();

    /**

     * The EncryptedExtensions handshake message.

     */

    static final class EncryptedExtensionsMessage extends HandshakeMessage {

        private final SSLExtensions extensions;

        EncryptedExtensionsMessage(

                HandshakeContext handshakeContext) throws IOException {

            super(handshakeContext);

            this.extensions = new SSLExtensions(this);

        }

        EncryptedExtensionsMessage(HandshakeContext handshakeContext,

                ByteBuffer m) throws IOException {

            super(handshakeContext);

            // struct {

            //     Extension extensions<0..2^16-1>;

            // } EncryptedExtensions;

            if (m.remaining() < 2) {

                handshakeContext.conContext.fatal(Alert.ILLEGAL_PARAMETER,

                        "Invalid EncryptedExtensions handshake message: " +

                        "no sufficient data");

            }

            SSLExtension[] encryptedExtensions =

                    handshakeContext.sslConfig.getEnabledExtensions(

                            SSLHandshake.ENCRYPTED_EXTENSIONS);

            this.extensions = new SSLExtensions(this, m, encryptedExtensions);

        }

        @Override

        SSLHandshake handshakeType() {

            return SSLHandshake.ENCRYPTED_EXTENSIONS;

        }

        @Override

        int messageLength() {

            int extLen = extensions.length();

            if (extLen == 0) {

                extLen = 2;     // empty extensions

            }

            return extLen;

        }

        @Override

        void send(HandshakeOutStream hos) throws IOException {

            // Is it an empty extensions?

            if (extensions.length() == 0) {

                hos.putInt16(0);

            } else {

                extensions.send(hos);

            }

        }

        @Override

        public String toString() {

            MessageFormat messageFormat = new MessageFormat(

                    "\"EncryptedExtensions\": [\n" +

                    "{0}\n" +

                    "]",

                    Locale.ENGLISH);

            Object[] messageFields = {

                Utilities.indent(extensions.toString())

            };

            return messageFormat.format(messageFields);

        }

    }

    /**

     * The EncryptedExtensions handshake message consumer.

     */

    private static final class EncryptedExtensionsProducer

            implements HandshakeProducer {

        // Prevent instantiation of this class.

        private EncryptedExtensionsProducer() {

            // blank

        }

        @Override

        public byte[] produce(ConnectionContext context,

                HandshakeMessage message) throws IOException {

            // The producing happens in server side only.

            ServerHandshakeContext shc = (ServerHandshakeContext)context;

            // Change client/server handshake traffic secrets.

            // TODO

            EncryptedExtensionsMessage eem =

                    new EncryptedExtensionsMessage(shc);

            SSLExtension[] extTypes =

                    shc.sslConfig.getEnabledExtensions(

                            SSLHandshake.ENCRYPTED_EXTENSIONS,

                            shc.negotiatedProtocol);

            eem.extensions.produce(shc, extTypes);

            if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {

                SSLLogger.fine("Produced EncryptedExtensions message", eem);

            }

            // Output the handshake message.

            eem.write(shc.handshakeOutput);

            shc.handshakeOutput.flush();

            // The handshake message has been delivered.

            return null;

        }

    }

    /**

     * The EncryptedExtensions handshake message consumer.

     */

    private static final class EncryptedExtensionsConsumer

            implements SSLConsumer {

        // Prevent instantiation of this class.

        private EncryptedExtensionsConsumer() {

            // blank

        }

        @Override

        public void consume(ConnectionContext context,

                ByteBuffer message) throws IOException {

            // The consuming happens in client side only.

            ClientHandshakeContext chc = (ClientHandshakeContext)context;

            // clean up this consumer

            chc.handshakeConsumers.remove(SSLHandshake.ENCRYPTED_EXTENSIONS.id);

            EncryptedExtensionsMessage eem =

                    new EncryptedExtensionsMessage(chc, message);

            if (SSLLogger.isOn && SSLLogger.isOn("ssl,handshake")) {

                SSLLogger.fine(

                        "Consuming EncryptedExtensions handshake message", eem);

            }

            //

            // validate

            //

            SSLExtension[] extTypes = chc.sslConfig.getEnabledExtensions(

                    SSLHandshake.ENCRYPTED_EXTENSIONS);

            eem.extensions.consumeOnLoad(chc, extTypes);

            //

            // update

            //

            // TODO: all extensions should be considered.

            eem.extensions.consumeOnTrade(chc, extTypes);

            //

            // produce

            //

            // Need no new handshake message producers here.

        }

    }

}