1 /*

     2  * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package jdk.incubator.http;

    27 

    28 import java.io.IOException;

    29 import java.lang.System.Logger.Level;

    30 import java.net.InetSocketAddress;

    31 import java.nio.ByteBuffer;

    32 import java.nio.channels.SocketChannel;

    33 import java.util.concurrent.CompletableFuture;

    34 import java.util.function.Function;

    35 

    36 import jdk.incubator.http.internal.common.FlowTube;

    37 import jdk.incubator.http.internal.common.MinimalFuture;

    38 

    39 import static jdk.incubator.http.HttpResponse.BodyHandler.discard;

    40 

    41 /**

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

    43  * encrypt. Used by WebSocket, as well as HTTP over SSL + Proxy.

    44  * Wrapped in SSLTunnelConnection or AsyncSSLTunnelConnection for encryption.

    45  */

    46 final class PlainTunnelingConnection extends HttpConnection {

    47 

    48     final PlainHttpConnection delegate;

    49     final HttpHeaders proxyHeaders;

    50     final InetSocketAddress proxyAddr;

    51     private volatile boolean connected;

    52 

    53     protected PlainTunnelingConnection(InetSocketAddress addr,

    54                                        InetSocketAddress proxy,

    55                                        HttpClientImpl client,

    56                                        HttpHeaders proxyHeaders) {

    57         super(addr, client);

    58         this.proxyAddr = proxy;

    59         this.proxyHeaders = proxyHeaders;

    60         delegate = new PlainHttpConnection(proxy, client);

    61     }

    62 

    63     @Override

    64     public CompletableFuture<Void> connectAsync() {

    65         debug.log(Level.DEBUG, "Connecting plain connection");

    66         return delegate.connectAsync()

    67             .thenCompose((Void v) -> {

    68                 debug.log(Level.DEBUG, "sending HTTP/1.1 CONNECT");

    69                 HttpClientImpl client = client();

    70                 assert client != null;

    71                 HttpRequestImpl req = new HttpRequestImpl("CONNECT", address, proxyHeaders);

    72                 MultiExchange<Void> mulEx = new MultiExchange<>(null, req,

    73                         client, discard(null), null, null);

    74                 Exchange<Void> connectExchange = new Exchange<>(req, mulEx);

    75 

    76                 return connectExchange

    77                         .responseAsyncImpl(delegate)

    78                         .thenCompose((Response resp) -> {

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

    80                             debug.log(Level.DEBUG, "got response: %d", resp.statusCode());

    81                             if (resp.statusCode() == 407) {

    82                                 return connectExchange.ignoreBody().handle((r,t) -> {

    83                                     // close delegate after reading body: we won't

    84                                     // be reusing that connection anyway.

    85                                     delegate.close();

    86                                     ProxyAuthenticationRequired authenticationRequired =

    87                                             new ProxyAuthenticationRequired(resp);

    88                                     cf.completeExceptionally(authenticationRequired);

    89                                     return cf;

    90                                 }).thenCompose(Function.identity());

    91                             } else if (resp.statusCode() != 200) {

    92                                 delegate.close();

    93                                 cf.completeExceptionally(new IOException(

    94                                         "Tunnel failed, got: "+ resp.statusCode()));

    95                             } else {

    96                                 // get the initial/remaining bytes

    97                                 ByteBuffer b = ((Http1Exchange<?>)connectExchange.exchImpl).drainLeftOverBytes();

    98                                 int remaining = b.remaining();

    99                                 assert remaining == 0: "Unexpected remaining: " + remaining;

   100                                 connected = true;

   101                                 cf.complete(null);

   102                             }

   103                             return cf;

   104                         });

   105             });

   106     }

   107 

   108     @Override

   109     boolean isTunnel() { return true; }

   110 

   111     @Override

   112     HttpPublisher publisher() { return delegate.publisher(); }

   113 

   114     @Override

   115     boolean connected() {

   116         return connected;

   117     }

   118 

   119     @Override

   120     SocketChannel channel() {

   121         return delegate.channel();

   122     }

   123 

   124     @Override

   125     FlowTube getConnectionFlow() {

   126         return delegate.getConnectionFlow();

   127     }

   128 

   129     @Override

   130     ConnectionPool.CacheKey cacheKey() {

   131         return new ConnectionPool.CacheKey(null, proxyAddr);

   132     }

   133 

   134     @Override

   135     public void close() {

   136         delegate.close();

   137         connected = false;

   138     }

   139 

   140     @Override

   141     void shutdownInput() throws IOException {

   142         delegate.shutdownInput();

   143     }

   144 

   145     @Override

   146     void shutdownOutput() throws IOException {

   147         delegate.shutdownOutput();

   148     }

   149 

   150     @Override

   151     boolean isSecure() {

   152         return false;

   153     }

   154 

   155     @Override

   156     boolean isProxied() {

   157         return true;

   158     }

   159 

   160     // Support for WebSocket/RawChannelImpl which unfortunately

   161     // still depends on synchronous read/writes.

   162     // It should be removed when RawChannelImpl moves to using asynchronous APIs.

   163     @Override

   164     DetachedConnectionChannel detachChannel() {

   165         return delegate.detachChannel();

   166     }

   167 }