/*

 * Copyright (c) 2015, 2016, 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 java.net.http;

import java.io.IOException;

import java.net.InetSocketAddress;

import java.nio.ByteBuffer;

import java.nio.channels.SocketChannel;

import java.security.AccessControlContext;

import java.util.concurrent.CompletableFuture;

/**

 * A plain text socket tunnel through a proxy. Uses "CONNECT" but does not

 * encrypt. Used by WebSockets. Subclassed in SSLTunnelConnection for encryption.

 */

class PlainTunnelingConnection extends HttpConnection {

    final PlainHttpConnection delegate;

    protected final InetSocketAddress proxyAddr;

    private volatile boolean connected;

    private final AccessControlContext acc;

    @Override

    public CompletableFuture<Void> connectAsync() {

        return delegate.connectAsync()

            .thenCompose((Void v) -> {

                HttpRequestImpl req = new HttpRequestImpl(client, "CONNECT", address);

                Exchange connectExchange = new Exchange(req, acc);

                return connectExchange

                    .responseAsyncImpl(delegate)

                    .thenCompose((HttpResponse r) -> {

                        CompletableFuture<Void> cf = new CompletableFuture<>();

                        if (r.statusCode() != 200) {

                            cf.completeExceptionally(new IOException("Tunnel failed"));

                        } else {

                            connected = true;

                            cf.complete(null);

                        }

                        return cf;

                    });

            });

    }

    @Override

    public void connect() throws IOException, InterruptedException {

        delegate.connect();

        HttpRequestImpl req = new HttpRequestImpl(client, "CONNECT", address);

        Exchange connectExchange = new Exchange(req, acc);

        HttpResponse r = connectExchange.responseImpl(delegate);

        if (r.statusCode() != 200) {

            throw new IOException("Tunnel failed");

        }

        connected = true;

    }

    @Override

    boolean connected() {

        return connected;

    }

    protected PlainTunnelingConnection(InetSocketAddress addr,

                                       InetSocketAddress proxy,

                                       HttpClientImpl client,

                                       AccessControlContext acc) {

        super(addr, client);

        this.proxyAddr = proxy;

        this.acc = acc;

        delegate = new PlainHttpConnection(proxy, client);

    }

    @Override

    SocketChannel channel() {

        return delegate.channel();

    }

    @Override

    ConnectionPool.CacheKey cacheKey() {

        return new ConnectionPool.CacheKey(null, proxyAddr);

    }

    @Override

    long write(ByteBuffer[] buffers, int start, int number) throws IOException {

        return delegate.write(buffers, start, number);

    }

    @Override

    long write(ByteBuffer buffer) throws IOException {

        return delegate.write(buffer);

    }

    @Override

    void close() {

        delegate.close();

        connected = false;

    }

    @Override

    protected ByteBuffer readImpl(int length) throws IOException {

        return delegate.readImpl(length);

    }

    @Override

    CompletableFuture<Void> whenReceivingResponse() {

        return delegate.whenReceivingResponse();

    }

    @Override

    protected int readImpl(ByteBuffer buffer) throws IOException {

        return delegate.readImpl(buffer);

    }

    @Override

    boolean isSecure() {

        return false;

    }

    @Override

    boolean isProxied() {

        return true;

    }

}