/*

 * Copyright (c) 2016, 2018, 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

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 */

/*

 * @test

 * @bug 8163561

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

 *          java.net.http

 * @summary Verify that Proxy-Authenticate header is correctly handled

 * @run main/othervm ProxyAuthTest

 */

import java.io.BufferedWriter;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

import java.net.Authenticator;

import java.net.InetSocketAddress;

import java.net.PasswordAuthentication;

import java.net.Proxy;

import java.net.ProxySelector;

import java.net.ServerSocket;

import java.net.Socket;

import java.net.SocketAddress;

import java.net.URI;

import java.net.http.HttpClient;

import java.net.http.HttpRequest;

import java.net.http.HttpResponse;

import java.net.http.HttpResponse.BodyHandlers;

import java.util.Base64;

import java.util.List;

import sun.net.www.MessageHeader;

public class ProxyAuthTest {

    private static final String AUTH_USER = "user";

    private static final String AUTH_PASSWORD = "password";

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

        try (ServerSocket ss = new ServerSocket()) {

            ss.setReuseAddress(false);

            int port = ss.getLocalPort();

            MyProxy proxy = new MyProxy(ss);

            (new Thread(proxy)).start();

            System.out.println("Proxy listening port " + port);

            Auth auth = new Auth();

            URI uri = new URI("http://www.google.ie/");

            CountingProxySelector ps = CountingProxySelector.of(paddr);

            HttpClient client = HttpClient.newBuilder()

                                          .proxy(ps)

                                          .authenticator(auth)

                                          .build();

            HttpRequest req = HttpRequest.newBuilder(uri).GET().build();

            HttpResponse<?> resp = client.sendAsync(req, BodyHandlers.discarding()).get();

            if (resp.statusCode() != 404) {

                throw new RuntimeException("Unexpected status code: " + resp.statusCode());

            }

            if (auth.isCalled) {

                System.out.println("Authenticator is called");

            } else {

                throw new RuntimeException("Authenticator is not called");

            }

            if (!proxy.matched) {

                throw new RuntimeException("Proxy authentication failed");

            }

            if (ps.count() > 1) {

                throw new RuntimeException("CountingProxySelector. Expected 1, got " + ps.count());

            }

        }

    }

    static class Auth extends Authenticator {

        private volatile boolean isCalled;

        @Override

        protected PasswordAuthentication getPasswordAuthentication() {

            System.out.println("scheme: " + this.getRequestingScheme());

            isCalled = true;

            return new PasswordAuthentication(AUTH_USER,

                    AUTH_PASSWORD.toCharArray());

        }

    }

    /**

     * A Proxy Selector that wraps a ProxySelector.of(), and counts the number

     * of times its select method has been invoked. This can be used to ensure

     * that the Proxy Selector is invoked only once per HttpClient.sendXXX

     * invocation.

     */

    static class CountingProxySelector extends ProxySelector {

        private final ProxySelector proxySelector;

        private volatile int count; // 0

        private CountingProxySelector(InetSocketAddress proxyAddress) {

            proxySelector = ProxySelector.of(proxyAddress);

        }

        public static CountingProxySelector of(InetSocketAddress proxyAddress) {

            return new CountingProxySelector(proxyAddress);

        }

        int count() { return count; }

        @Override

        public List<Proxy> select(URI uri) {

            count++;

            return proxySelector.select(uri);

        }

        @Override

        public void connectFailed(URI uri, SocketAddress sa, IOException ioe) {

            proxySelector.connectFailed(uri, sa, ioe);

        }

    }

    static class MyProxy implements Runnable {

        final ServerSocket ss;

        private volatile boolean matched;

        MyProxy(ServerSocket ss) {

            this.ss = ss;

        }

        public void run() {

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

                try (Socket s = ss.accept();

                     InputStream in = s.getInputStream();

                     OutputStream os = s.getOutputStream();

                     BufferedWriter writer = new BufferedWriter(

                             new OutputStreamWriter(os));

                     PrintWriter out = new PrintWriter(writer);) {

                    MessageHeader headers = new MessageHeader(in);

                    System.out.println("Proxy: received " + headers);

                    String authInfo = headers.findValue("Proxy-Authorization");

                    if (authInfo != null) {

                        authenticate(authInfo);

                        out.print("HTTP/1.1 404 Not found\r\n");

                        out.print("\r\n");

                        System.out.println("Proxy: 404");

                        out.flush();

                    } else {

                        out.print("HTTP/1.1 407 Proxy Authorization Required\r\n");

                        out.print(

                                "Proxy-Authenticate: Basic realm=\"a fake realm\"\r\n");

                        out.print("\r\n");

                        System.out.println("Proxy: Authorization required");

                        out.flush();

                    }

                } catch (IOException x) {

                    System.err.println("Unexpected IOException from proxy.");

                    x.printStackTrace();

                    break;

                }

            }

        }

        private void authenticate(String authInfo) throws IOException {

            try {

                authInfo.trim();

                int ind = authInfo.indexOf(' ');

                String recvdUserPlusPass = authInfo.substring(ind + 1).trim();

                // extract encoded username:passwd

                String value = new String(

                        Base64.getMimeDecoder().decode(recvdUserPlusPass));

                String userPlusPassword = AUTH_USER + ":" + AUTH_PASSWORD;

                if (userPlusPassword.equals(value)) {

                    matched = true;

                    System.out.println("Proxy: client authentication successful");

                } else {

                    System.err.println(

                            "Proxy: client authentication failed, expected ["

                                    + userPlusPassword + "], actual [" + value

                                    + "]");

                }

            } catch (Exception e) {

                throw new IOException(

                        "Proxy received invalid Proxy-Authorization value: "

                                + authInfo);

            }

        }

    }

}