/*

 * Copyright (c) 2015, 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 jdk.internal.net.http;

import java.net.InetSocketAddress;

import java.nio.channels.SocketChannel;

import java.util.concurrent.CompletableFuture;

import java.net.http.HttpHeaders;

import java.util.function.Function;

import jdk.internal.net.http.common.MinimalFuture;

import jdk.internal.net.http.common.SSLTube;

import jdk.internal.net.http.common.Utils;

/**

 * An SSL tunnel built on a Plain (CONNECT) TCP tunnel.

 */

class AsyncSSLTunnelConnection extends AbstractAsyncSSLConnection {

    final PlainTunnelingConnection plainConnection;

    final PlainHttpPublisher writePublisher;

    volatile SSLTube flow;

    AsyncSSLTunnelConnection(InetSocketAddress addr,

                             HttpClientImpl client,

                             String[] alpn,

                             InetSocketAddress proxy,

                             HttpHeaders proxyHeaders)

    {

        super(addr, client, Utils.getServerName(addr), addr.getPort(), alpn);

        this.plainConnection = new PlainTunnelingConnection(addr, proxy, client, proxyHeaders);

        this.writePublisher = new PlainHttpPublisher();

    }

    @Override

    public CompletableFuture<Void> connectAsync(Exchange<?> exchange) {

        if (debug.on()) debug.log("Connecting plain tunnel connection");

        // This will connect the PlainHttpConnection flow, so that

        // its HttpSubscriber and HttpPublisher are subscribed to the

        // SocketTube

        return plainConnection

                .connectAsync(exchange)

                .thenApply( unused -> {

                    if (debug.on()) debug.log("creating SSLTube");

                    // create the SSLTube wrapping the SocketTube, with the given engine

                    flow = new SSLTube(engine,

                                       client().theExecutor(),

                                       client().getSSLBufferSupplier()::recycle,

                                       plainConnection.getConnectionFlow());

                    return null;} );

    }

    @Override

    public CompletableFuture<Void> finishConnect() {

        // The actual ALPN value, which may be the empty string, is not

        // interesting at this point, only that the handshake has completed.

        return getALPN()

                .handle((String unused, Throwable ex) -> {

                    if (ex == null) {

                        return plainConnection.finishConnect();

                    } else {

                        plainConnection.close();

                        return MinimalFuture.<Void>failedFuture(ex);

                    } })

                .thenCompose(Function.identity());

    }

    @Override

    boolean isTunnel() { return true; }

    @Override

    boolean connected() {

        return plainConnection.connected(); // && sslDelegate.connected();

    }

    @Override

    HttpPublisher publisher() { return writePublisher; }

    @Override

    public String toString() {

        return "AsyncSSLTunnelConnection: " + super.toString();

    }

    @Override

    ConnectionPool.CacheKey cacheKey() {

        return ConnectionPool.cacheKey(address, plainConnection.proxyAddr);

    }

    @Override

    public void close() {

        plainConnection.close();

    }

    @Override

    SocketChannel channel() {

        return plainConnection.channel();

    }

    @Override

    boolean isProxied() {

        return true;

    }

    @Override

    SSLTube getConnectionFlow() {

       return flow;

   }

}