/*

 * Copyright (c) 2014, 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.

 */

import java.io.*;

import java.net.*;

import java.security.*;

import java.security.cert.X509Certificate;

import java.util.ArrayList;

import java.util.concurrent.atomic.AtomicBoolean;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import javax.net.ServerSocketFactory;

import javax.net.SocketFactory;

import javax.net.ssl.*;

/**

 * @test

 * @bug 8025710

 * @summary Proxied https connection reuse by HttpClient can send CONNECT to the server

 */

public class B8025710 {

    private final static AtomicBoolean connectInServer = new AtomicBoolean();

    private static final String keystorefile =

            System.getProperty("test.src", "./")

            + "/../../../../../javax/net/ssl/etc/keystore";

    private static final String passphrase = "passphrase";

    public static void main(String[] args) throws Exception {

        new B8025710().runTest();

        if (connectInServer.get())

            throw new RuntimeException("TEST FAILED: server got proxy header");

        else

            System.out.println("TEST PASSED");

    }

    private void runTest() throws Exception {

        ProxyServer proxyServer = new ProxyServer();

        HttpServer httpServer = new HttpServer();

        httpServer.start();

        proxyServer.start();

        URL url = new URL("https", InetAddress.getLocalHost().getHostName(),

                httpServer.getPort(), "/");

        Proxy proxy = new Proxy(Proxy.Type.HTTP, proxyServer.getAddress());

        HttpsURLConnection.setDefaultSSLSocketFactory(createTestSSLSocketFactory());

        // Make two connections. The bug occurs when the second request is made

        for (int i = 0; i < 2; i++) {

            System.out.println("Client: Requesting " + url.toExternalForm()

                    + " via " + proxy.toString()

                    + " (attempt " + (i + 1) + " of 2)");

            HttpsURLConnection connection =

                    (HttpsURLConnection) url.openConnection(proxy);

            connection.setRequestMethod("POST");

            connection.setDoInput(true);

            connection.setDoOutput(true);

            connection.setRequestProperty("User-Agent", "Test/1.0");

            connection.getOutputStream().write("Hello, world!".getBytes("UTF-8"));

            if (connection.getResponseCode() != 200) {

                System.err.println("Client: Unexpected response code "

                        + connection.getResponseCode());

                break;

            }

            String response = readLine(connection.getInputStream());

            if (!"Hi!".equals(response)) {

                System.err.println("Client: Unexpected response body: "

                        + response);

            }

        }

        httpServer.close();

        proxyServer.close();

        httpServer.join();

        proxyServer.join();

    }

    class ProxyServer extends Thread implements Closeable {

        private final ServerSocket proxySocket;

        private final Pattern connectLinePattern =

                Pattern.compile("^CONNECT ([^: ]+):([0-9]+) HTTP/[0-9.]+$");

        private final String PROXY_RESPONSE =

                "HTTP/1.0 200 Connection Established\r\n"

                + "Proxy-Agent: TestProxy/1.0\r\n"

                + "\r\n";

        ProxyServer() throws Exception {

            super("ProxyServer Thread");

            // Create the http proxy server socket

            proxySocket = ServerSocketFactory.getDefault().createServerSocket();

            proxySocket.bind(new InetSocketAddress(InetAddress.getLocalHost(), 0));

        }

        public SocketAddress getAddress() { return  proxySocket.getLocalSocketAddress(); }

        @Override

        public void close() throws IOException {

            proxySocket.close();

        }

        @Override

        public void run() {

            ArrayList<Thread> threads = new ArrayList<>();

            int connectionCount = 0;

            try {

                while (connectionCount++ < 2) {

                    final Socket clientSocket = proxySocket.accept();

                    final int proxyConnectionCount = connectionCount;

                    System.out.println("Proxy: NEW CONNECTION "

                            + proxyConnectionCount);

                    Thread t = new Thread("ProxySocket" + proxyConnectionCount) {

                        @Override

                        public void run() {

                            try {

                                String firstLine =

                                        readHeader(clientSocket.getInputStream());

                                Matcher connectLineMatcher =

                                        connectLinePattern.matcher(firstLine);

                                if (!connectLineMatcher.matches()) {

                                    System.out.println("Proxy: Unexpected"

                                            + " request to the proxy: "

                                            + firstLine);

                                    return;

                                }

                                String host    = connectLineMatcher.group(1);

                                String portStr = connectLineMatcher.group(2);

                                int port       = Integer.parseInt(portStr);

                                Socket serverSocket = SocketFactory.getDefault()

                                        .createSocket(host, port);

                                clientSocket.getOutputStream()

                                        .write(PROXY_RESPONSE.getBytes("UTF-8"));

                                ProxyTunnel copyToClient =

                                        new ProxyTunnel(serverSocket, clientSocket);

                                ProxyTunnel copyToServer =

                                        new ProxyTunnel(clientSocket, serverSocket);

                                copyToClient.start();

                                copyToServer.start();

                                copyToClient.join();

                                // here copyToClient.close() would not provoke the

                                // bug ( since it would trigger the retry logic in

                                // HttpURLConnction.writeRequests ), so close only

                                // the output to get the connection in this state.

                                clientSocket.shutdownOutput();

                                try {

                                    Thread.sleep(3000);

                                } catch (InterruptedException ignored) { }

                                // now close all connections to finish the test

                                copyToServer.close();

                                copyToClient.close();

                            } catch (IOException | NumberFormatException

                                    | InterruptedException e) {

                                e.printStackTrace();

                            }

                        }

                    };

                    threads.add(t);

                    t.start();

                }

                for (Thread t: threads)

                    t.join();

            } catch (IOException | InterruptedException e) {

                e.printStackTrace();

            }

        }

    }

    /**

     * 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.

     */

    class ProxyTunnel extends Thread {

        private final Socket sockIn;

        private final Socket sockOut;

        private final InputStream input;

        private final OutputStream output;

        public ProxyTunnel(Socket sockIn, Socket sockOut) throws IOException {

            super("ProxyTunnel");

            this.sockIn  = sockIn;

            this.sockOut = sockOut;

            input  = sockIn.getInputStream();

            output = sockOut.getOutputStream();

        }

        public void run() {

            byte[] buf = new byte[8192];

            int bytesRead;

            try {

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

                    output.write(buf, 0, bytesRead);

                    output.flush();

                }

            } catch (IOException ignored) {

                close();

            }

        }

        public void close() {

            try {

                if (!sockIn.isClosed())

                    sockIn.close();

                if (!sockOut.isClosed())

                    sockOut.close();

            } catch (IOException ignored) { }

        }

    }

    /**

     * the server thread

     */

    class HttpServer extends Thread implements Closeable {

        private final ServerSocket serverSocket;

        private final SSLSocketFactory sslSocketFactory;

        private final String serverResponse =

                "HTTP/1.1 200 OK\r\n"

                + "Content-Type: text/plain\r\n"

                + "Content-Length: 3\r\n"

                + "\r\n"

                + "Hi!";

        private int connectionCount = 0;

        HttpServer() throws Exception {

            super("HttpServer Thread");

            KeyStore ks = KeyStore.getInstance("JKS");

            ks.load(new FileInputStream(keystorefile), passphrase.toCharArray());

            KeyManagerFactory factory = KeyManagerFactory.getInstance("SunX509");

            factory.init(ks, passphrase.toCharArray());

            SSLContext ctx = SSLContext.getInstance("TLS");

            ctx.init(factory.getKeyManagers(), null, null);

            sslSocketFactory = ctx.getSocketFactory();

            // Create the server that the test wants to connect to via the proxy

            serverSocket = ServerSocketFactory.getDefault().createServerSocket();

            serverSocket.bind(new InetSocketAddress(InetAddress.getLocalHost(), 0));

        }

        public int getPort() { return  serverSocket.getLocalPort(); }

        @Override

        public void close() throws IOException { serverSocket.close(); }

        @Override

        public void run() {

            try {

                while (connectionCount++ < 2) {

                    Socket socket = serverSocket.accept();

                    System.out.println("Server: NEW CONNECTION "

                            + connectionCount);

                    SSLSocket sslSocket = (SSLSocket) sslSocketFactory

                            .createSocket(socket,null, getPort(), false);

                    sslSocket.setUseClientMode(false);

                    sslSocket.startHandshake();

                    String firstLine = readHeader(sslSocket.getInputStream());

                    if (firstLine != null && firstLine.contains("CONNECT")) {

                        System.out.println("Server: BUG! HTTP CONNECT"

                                + " encountered: " + firstLine);

                        connectInServer.set(true);

                    }

                    // write the success response, the request body is not read.

                    // close only output and keep input open.

                    OutputStream out = sslSocket.getOutputStream();

                    out.write(serverResponse.getBytes("UTF-8"));

                    socket.shutdownOutput();

                }

            } catch (IOException e) {

                e.printStackTrace();

            }

        }

    }

    /**

     * read the header and return only the first line.

     *

     * @param inputStream the stream to read from

     * @return the first line of the stream

     * @throws IOException if reading failed

     */

    private static String readHeader(InputStream inputStream)

            throws IOException {

        String line;

        String firstLine = null;

        while ((line = readLine(inputStream)) != null && line.length() > 0) {

            if (firstLine == null) {

                firstLine = line;

            }

        }

        return firstLine;

    }

    /**

     * read a line from stream.

     *

     * @param inputStream the stream to read from

     * @return the line

     * @throws IOException  if reading failed

     */

    private static String readLine(InputStream inputStream)

            throws IOException {

        final StringBuilder line = new StringBuilder();

        int ch;

        while ((ch = inputStream.read()) != -1) {

            if (ch == '\r') {

                continue;

            }

            if (ch == '\n') {

                break;

            }

            line.append((char) ch);

        }

        return line.toString();

    }

    private SSLSocketFactory createTestSSLSocketFactory() {

        HttpsURLConnection.setDefaultHostnameVerifier(new HostnameVerifier() {

            @Override

            public boolean verify(String hostname, SSLSession sslSession) {

                // ignore the cert's CN; it's not important to this test

                return true;

            }

        });

        // Set up the socket factory to use a trust manager that trusts all

        // certs, since trust validation isn't important to this test

        final TrustManager[] trustAllCertChains = new TrustManager[] {

            new X509TrustManager() {

                @Override

                public X509Certificate[] getAcceptedIssuers() {

                    return null;

                }

                @Override

                public void checkClientTrusted(X509Certificate[] certs,

                        String authType) {

                }

                @Override

                public void checkServerTrusted(X509Certificate[] certs,

                        String authType) {

                }

            }

        };

        final SSLContext sc;

        try {

            sc = SSLContext.getInstance("TLS");

        } catch (NoSuchAlgorithmException e) {

            throw new RuntimeException(e);

        }

        try {

            sc.init(null, trustAllCertChains, new java.security.SecureRandom());

        } catch (KeyManagementException e) {

            throw new RuntimeException(e);

        }

        return sc.getSocketFactory();

    }

}