/*

 * Copyright (c) 2003, 2012, 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.

 *

 * 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.

 */

/* @test

 * @bug 4920526

 * @summary Needs per connection proxy support for URLs

 * @modules java.base/sun.net.www

 * @library ../../../sun/net/www/httptest/

 * @build ClosedChannelList TestHttpServer HttpTransaction HttpCallback

 * @compile PerConnectionProxy.java

 * @run main/othervm -Dhttp.proxyHost=inexistant -Dhttp.proxyPort=8080 PerConnectionProxy

 */

import java.net.*;

import java.io.*;

import sun.net.www.*;

public class PerConnectionProxy implements HttpCallback {

    static TestHttpServer server;

    public void request (HttpTransaction req) {

        req.setResponseEntityBody ("Hello .");

        try {

            req.sendResponse (200, "Ok");

            req.orderlyClose();

        } catch (IOException e) {

        }

    }

    public static void main(String[] args) {

        try {

            server = new TestHttpServer (new PerConnectionProxy(), 1, 10, 0);

            ProxyServer pserver = new ProxyServer(InetAddress.getByName("localhost"), server.getLocalPort());

            // start proxy server

            new Thread(pserver).start();

            URL url = new URL("http://localhost:"+server.getLocalPort());

            // for non existing proxy expect an IOException

            try {

                InetSocketAddress isa = InetSocketAddress.createUnresolved("inexistent", 8080);

                Proxy proxy = new Proxy(Proxy.Type.HTTP, isa);

                HttpURLConnection urlc = (HttpURLConnection)url.openConnection (proxy);

                InputStream is = urlc.getInputStream ();

                is.close();

                throw new RuntimeException("non existing per connection proxy should lead to IOException");

            } catch (IOException ioex) {

                // expected

            }

            // for NO_PROXY, expect direct connection

            try {

                HttpURLConnection urlc = (HttpURLConnection)url.openConnection (Proxy.NO_PROXY);

                int respCode = urlc.getResponseCode();

                urlc.disconnect();

            } catch (IOException ioex) {

                throw new RuntimeException("direct connection should succeed :"+ioex.getMessage());

            }

            // for a normal proxy setting expect to see connection

            // goes through that proxy

            try {

                InetSocketAddress isa = InetSocketAddress.createUnresolved("localhost", pserver.getPort());

                Proxy p = new Proxy(Proxy.Type.HTTP, isa);

                HttpURLConnection urlc = (HttpURLConnection)url.openConnection (p);

                int respCode = urlc.getResponseCode();

                urlc.disconnect();

            } catch (IOException ioex) {

                throw new RuntimeException("connection through a local proxy should succeed :"+ioex.getMessage());

            }

        } catch (Exception e) {

            throw new RuntimeException(e);

        } finally {

            if (server != null) {

                server.terminate();

            }

        }

    }

    static class ProxyServer extends Thread {

        private static ServerSocket ss = null;

        // client requesting for a tunnel

        private Socket clientSocket = null;

        /*

         * Origin server's address and port that the client

         * wants to establish the tunnel for communication.

         */

        private InetAddress serverInetAddr;

        private int     serverPort;

        public ProxyServer(InetAddress server, int port) throws IOException {

            serverInetAddr = server;

            serverPort = port;

            ss = new ServerSocket(0);

        }

        public void run() {

            try {

                clientSocket = ss.accept();

                processRequests();

            } catch (Exception e) {

                System.out.println("Proxy Failed: " + e);

                e.printStackTrace();

                try {

                    ss.close();

                }

                catch (IOException excep) {

                    System.out.println("ProxyServer close error: " + excep);

                    excep.printStackTrace();

                }

            }

        }

        private void processRequests() throws Exception {

            // connection set to the tunneling mode

            Socket serverSocket = new Socket(serverInetAddr, serverPort);

            ProxyTunnel clientToServer = new ProxyTunnel(

                                                         clientSocket, serverSocket);

            ProxyTunnel serverToClient = new ProxyTunnel(

                                                         serverSocket, clientSocket);

            clientToServer.start();

            serverToClient.start();

            System.out.println("Proxy: Started tunneling.......");

            clientToServer.join();

            serverToClient.join();

            System.out.println("Proxy: Finished tunneling........");

            clientToServer.close();

            serverToClient.close();

        }

        /**

***************************************************************

*                       helper methods follow

***************************************************************

*/

        public int getPort() {

            return ss.getLocalPort();

        }

        /*

         * This inner class provides unidirectional data flow through the sockets

         * by continuously copying bytes from the input socket onto the output

         * socket, until both sockets are open and EOF has not been received.

         */

        static class ProxyTunnel extends Thread {

            Socket sockIn;

            Socket sockOut;

            InputStream input;

            OutputStream output;

            public ProxyTunnel(Socket sockIn, Socket sockOut)

                throws Exception {

                this.sockIn = sockIn;

                this.sockOut = sockOut;

                input = sockIn.getInputStream();

                output = sockOut.getOutputStream();

            }

            public void run() {

                int BUFFER_SIZE = 400;

                byte[] buf = new byte[BUFFER_SIZE];

                int bytesRead = 0;

                int count = 0;  // keep track of the amount of data transfer

                try {

                    while ((bytesRead = input.read(buf)) >= 0) {

                        output.write(buf, 0, bytesRead);

                        output.flush();

                        count += bytesRead;

                    }

                } catch (IOException e) {

                    /*

                     * The peer end has closed the connection

                     * we will close the tunnel

                     */

                    close();

                }

            }

            public void close() {

                try {

                    if (!sockIn.isClosed())

                        sockIn.close();

                    if (!sockOut.isClosed())

                        sockOut.close();

                } catch (IOException ignored) { }

            }

        }

    }

}