/*

 * Copyright (c) 2019, 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 8231632

 * @summary HttpURLConnection::usingProxy could specify that it lazily evaluates the fact

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

 * @library /test/lib

 * @run main/othervm HttpURLConnUsingProxy

 */

import java.io.*;

import java.net.*;

import java.nio.charset.StandardCharsets;

import com.sun.net.httpserver.HttpExchange;

import com.sun.net.httpserver.HttpHandler;

import com.sun.net.httpserver.HttpServer;

import jdk.test.lib.net.URIBuilder;

public class HttpURLConnUsingProxy {

    static HttpServer server;

    static Proxy proxy;

    static InetSocketAddress isa;

    static class Handler implements HttpHandler {

        @Override

        public void handle(HttpExchange exchange) throws IOException {

            byte[] response = "Hello World!".getBytes(StandardCharsets.UTF_8);

            try (InputStream req = exchange.getRequestBody()) {

                req.readAllBytes();

            }

            exchange.sendResponseHeaders(200, response.length);

            try (OutputStream resp = exchange.getResponseBody()) {

                resp.write(response);

            }

        }

    }

    public static void main(String[] args) {

        try {

            InetAddress loopbackAddress = InetAddress.getLoopbackAddress();

            InetSocketAddress addr = new InetSocketAddress(loopbackAddress, 0);

            server = HttpServer.create(addr, 0);

            server.createContext("/HttpURLConnUsingProxy/http1/", new Handler());

            server.start();

            ProxyServer pserver = new ProxyServer(loopbackAddress,

                    server.getAddress().getPort());

            // Start proxy server

            new Thread(pserver).start();

            URL url = URIBuilder.newBuilder()

                    .scheme("http")

                    .loopback()

                    .port(server.getAddress().getPort())

                    .path("/HttpURLConnUsingProxy/http1/x.html")

                    .toURLUnchecked();

            // NO_PROXY

            try {

                HttpURLConnection urlc =

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

                assertEqual(urlc.usingProxy(), false);

                urlc.getResponseCode();

                assertEqual(urlc.usingProxy(), false);

                urlc.disconnect();

            } catch (IOException ioe) {

                throw new RuntimeException("Direct connection should succeed: "

                        + ioe.getMessage());

            }

            // Non-existing proxy

            try {

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

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

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

                assertEqual(urlc.usingProxy(), true);

                InputStream is = urlc.getInputStream();

                is.close();

                throw new RuntimeException("Non-existing proxy should cause IOException");

            } catch (IOException ioe) {

                // expected

            }

            // Normal proxy settings

            try {

                isa = InetSocketAddress.createUnresolved(loopbackAddress.getHostAddress(),

                        pserver.getPort());

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

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

                assertEqual(urlc.usingProxy(), true);

                urlc.getResponseCode();

                assertEqual(urlc.usingProxy(), true);

                urlc.disconnect();

            } catch (IOException ioe) {

                throw new RuntimeException("Connection through local proxy should succeed: "

                        + ioe.getMessage());

            }

            // Reuse proxy with new HttpURLConnection

            try {

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

                assertEqual(urlc.usingProxy(), true);

                urlc.getResponseCode();

                assertEqual(urlc.usingProxy(), true);

                read(urlc.getInputStream());

                assertEqual(urlc.usingProxy(), true);

            } catch (IOException ioe) {

                throw new RuntimeException("Connection through local proxy should succeed: "

                        + ioe.getMessage());

            }

            // Reuse proxy with existing HttpURLConnection

            try {

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

                assertEqual(urlc.usingProxy(), true);

                urlc.getResponseCode();

                assertEqual(urlc.usingProxy(), true);

                read(urlc.getInputStream());

                assertEqual(urlc.usingProxy(), true);

                urlc.disconnect();

            } catch (IOException ioe) {

                throw new RuntimeException("Connection through local proxy should succeed: "

                        + ioe.getMessage());

            }

            // ProxySelector with normal proxy settings

            try {

                ProxySelector.setDefault(ProxySelector.of(isa));

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

                assertEqual(urlc.usingProxy(), false);

                urlc.getResponseCode();

                assertEqual(urlc.usingProxy(), true);

                read(urlc.getInputStream());

                assertEqual(urlc.usingProxy(), true);

                urlc.disconnect();

                assertEqual(urlc.usingProxy(), true);

            } catch (IOException ioe) {

                throw new RuntimeException("Connection through local proxy should succeed: "

                        + ioe.getMessage());

            }

            // ProxySelector with proxying disabled

            try {

                ProxySelector.setDefault(ProxySelector.of(null));

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

                assertEqual(urlc.usingProxy(), false);

                urlc.getResponseCode();

                assertEqual(urlc.usingProxy(), false);

                read(urlc.getInputStream());

                assertEqual(urlc.usingProxy(), false);

            } catch (IOException ioe) {

                throw new RuntimeException("Direct connection should succeed: "

                        + ioe.getMessage());

            }

            // ProxySelector overwritten

            try {

                ProxySelector.setDefault(ProxySelector.of(isa));

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

                assertEqual(urlc.usingProxy(), false);

                urlc.disconnect();

            } catch (IOException ioe) {

                throw new RuntimeException("Direct connection should succeed: "

                        + ioe.getMessage());

            }

        } catch (Exception e) {

            throw new RuntimeException(e);

        } finally {

            if (server != null) {

                server.stop(0);

            }

        }

    }

    static class ProxyServer extends Thread {

        private static ServerSocket ss = null;

        // Client requesting 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, 0, InetAddress.getLoopbackAddress());

        }

        public void run() {

            while (true) {

                try {

                    clientSocket = ss.accept();

                    processRequests();

                } catch (Exception e) {

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

                    e.printStackTrace();

                    try {

                        ss.close();

                    } catch (IOException ioe) {

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

                        ioe.printStackTrace();

                    }

                }

            }

        }

        private void processRequests() throws Exception {

            // Connection set to 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 input socket to output socket

         * while 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 amount of data transferred

                try {

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

                        output.write(buf, 0, bytesRead);

                        output.flush();

                        count += bytesRead;

                    }

                } catch (IOException e) {

                    /*

                     * Peer end has closed connection

                     * so we close tunnel

                     */

                    close();

                }

            }

            public void close() {

                try {

                    if (!sockIn.isClosed())

                        sockIn.close();

                    if (!sockOut.isClosed())

                        sockOut.close();

                } catch (IOException ignored) {

                }

            }

        }

    }

    private static void assertEqual(boolean usingProxy, boolean expected) {

        if (usingProxy != expected) {

            throw new RuntimeException("Expected: " + expected

                    + " but usingProxy returned: " + usingProxy);

        }

    }

    private static String read(InputStream inputStream) throws IOException {

        StringBuilder sb = new StringBuilder();

        BufferedReader bufferedReader = new BufferedReader(

                new InputStreamReader(inputStream, StandardCharsets.UTF_8));

        int i = bufferedReader.read();

        while (i != -1) {

            sb.append((char) i);

            i = bufferedReader.read();

        }

        bufferedReader.close();

        return sb.toString();

    }

}