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/*
 * Copyright (c) 2010, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0, which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package org.glassfish.grizzly.samples.ssl;

import java.io.IOException;
import java.net.URL;
import java.nio.charset.Charset;

import javax.net.ssl.SSLEngine;

import org.glassfish.grizzly.Connection;
import org.glassfish.grizzly.EmptyCompletionHandler;
import org.glassfish.grizzly.filterchain.BaseFilter;
import org.glassfish.grizzly.filterchain.Filter;
import org.glassfish.grizzly.filterchain.FilterChain;
import org.glassfish.grizzly.filterchain.FilterChainBuilder;
import org.glassfish.grizzly.filterchain.FilterChainContext;
import org.glassfish.grizzly.filterchain.NextAction;
import org.glassfish.grizzly.filterchain.TransportFilter;
import org.glassfish.grizzly.nio.transport.TCPNIOTransport;
import org.glassfish.grizzly.nio.transport.TCPNIOTransportBuilder;
import org.glassfish.grizzly.ssl.SSLContextConfigurator;
import org.glassfish.grizzly.ssl.SSLEngineConfigurator;
import org.glassfish.grizzly.ssl.SSLFilter;
import org.glassfish.grizzly.utils.StringFilter;

/**
 * The simple {@link FilterChain} based SSL client, which sends a message to the echo server and waits for response. In
 * this sample we add a {@link StringFilter} to a {@link FilterChain}, so there is no need to do Buffer <-> String
 * transformation explicitly.
 *
 * @see StringFilter
 * @see SSLFilter
 * @see SSLContextConfigurator
 * @see SSLEngineConfigurator
 *
 * @author Alexey Stashok
 */
public class SSLEchoClient {
    private static final String MESSAGE = "Hello World!";

    public static void main(String[] args) throws IOException {
        // Create a FilterChain using FilterChainBuilder
        FilterChainBuilder filterChainBuilder = FilterChainBuilder.stateless();
        // Add TransportFilter, which is responsible
        // for reading and writing data to the connection
        filterChainBuilder.add(new TransportFilter());

        // Initialize and add SSLFilter
        final SSLEngineConfigurator serverConfig = initializeSSL();
        final SSLEngineConfigurator clientConfig = serverConfig.copy().setClientMode(true);

        final SSLFilter sslFilter = new SSLFilter(serverConfig, clientConfig);
        filterChainBuilder.add(sslFilter);

        // Add StringFilter, which will be responsible for Buffer <-> String transformation
        filterChainBuilder.add(new StringFilter(Charset.forName("UTF-8")));

        // Add Filter, which will send a greeting message and check the result
        filterChainBuilder.add(new SendMessageFilter(sslFilter));

        // Create TCP transport
        final TCPNIOTransport transport = TCPNIOTransportBuilder.newInstance().build();
        transport.setProcessor(filterChainBuilder.build());

        try {
            // start the transport
            transport.start();

            // perform async. connect to the server
            transport.connect(SSLEchoServer.HOST, SSLEchoServer.PORT);

            System.out.println("Press any key to stop the client...");
            System.in.read();
        } finally {
            System.out.println("Stopping transport...");
            // stop the transport
            transport.shutdownNow();

            System.out.println("Stopped transport...");
        }
    }

    /**
     * The {@link Filter}, responsible for handling client {@link Connection} events.
     */
    private static class SendMessageFilter extends BaseFilter {

        private final SSLFilter sslFilter;

        public SendMessageFilter(SSLFilter sslFilter) {
            this.sslFilter = sslFilter;
        }

        /**
         * Handle newly connected {@link Connection}, perform SSL handshake and send greeting message to a server.
         *
         * @param ctx {@link FilterChain} context
         * @return nextAction
         * @throws IOException
         */
        @Override
        @SuppressWarnings("unchecked")
        public NextAction handleConnect(FilterChainContext ctx) throws IOException {
            final Connection connection = ctx.getConnection();

            // Execute async SSL handshake
            sslFilter.handshake(connection, new EmptyCompletionHandler() {

                /**
                 * Once SSL handshake will be completed - send greeting message
                 */
                @Override
                public void completed(SSLEngine result) {
                    // Here we send String directly
                    connection.write(MESSAGE);
                }
            });

            return ctx.getInvokeAction();
        }

        /**
         * Handle server response and check, whether it has expected data
         * 
         * @param ctx {@link FilterChain} context
         * @return nextAction
         * @throws IOException
         */
        @Override
        public NextAction handleRead(FilterChainContext ctx) throws IOException {

            // The received message is String
            final String message = ctx.getMessage();

            // Check the message
            if (MESSAGE.equals(message)) {
                System.out.println("Got echo message: \"" + message + "\"");
            } else {
                System.out.println("Got unexpected echo message: \"" + message + "\"");
            }

            return ctx.getStopAction();
        }

    }

    /**
     * Initialize server side SSL configuration.
     *
     * @return server side {@link SSLEngineConfigurator}.
     */
    private static SSLEngineConfigurator initializeSSL() {
        // Initialize SSLContext configuration
        SSLContextConfigurator sslContextConfig = new SSLContextConfigurator();

        // Set key store
        ClassLoader cl = SSLEchoClient.class.getClassLoader();
        URL cacertsUrl = cl.getResource("ssltest-cacerts.jks");
        if (cacertsUrl != null) {
            sslContextConfig.setTrustStoreFile(cacertsUrl.getFile());
            sslContextConfig.setTrustStorePass("changeit");
        }

        // Set trust store
        URL keystoreUrl = cl.getResource("ssltest-keystore.jks");
        if (keystoreUrl != null) {
            sslContextConfig.setKeyStoreFile(keystoreUrl.getFile());
            sslContextConfig.setKeyStorePass("changeit");
        }

        // Create SSLEngine configurator
        return new SSLEngineConfigurator(sslContextConfig.createSSLContext(), false, false, false);
    }
}