/*

 * 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.

 *

 * 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

 * @modules java.net.http

 *          jdk.httpserver

 * @run main/othervm MultiAuthTest

 * @summary Basic Authentication test with multiple clients issuing

 *          multiple requests. Includes password changes

 *          on server and client side.

 */

import com.sun.net.httpserver.BasicAuthenticator;

import com.sun.net.httpserver.HttpContext;

import com.sun.net.httpserver.HttpExchange;

import com.sun.net.httpserver.HttpHandler;

import com.sun.net.httpserver.HttpServer;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.InetAddress;

import java.net.InetSocketAddress;

import java.net.PasswordAuthentication;

import java.net.URI;

import java.net.http.HttpClient;

import java.net.http.HttpRequest;

import java.net.http.HttpRequest.BodyPublishers;

import java.net.http.HttpResponse;

import java.net.http.HttpResponse.BodyHandlers;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

import static java.nio.charset.StandardCharsets.US_ASCII;

import java.util.UUID;

import java.util.concurrent.atomic.AtomicInteger;

import java.util.function.Function;

public class MultiAuthTest {

    static volatile boolean ok;

    static final String RESPONSE = "Hello world";

    static final String POST_BODY = "This is the POST body " + UUID.randomUUID();

    static HttpServer createServer(ExecutorService e, BasicAuthenticator sa) throws Exception {

        InetSocketAddress addr = new InetSocketAddress(InetAddress.getLoopbackAddress(), 0);

        HttpServer server = HttpServer.create(addr, 10);

        Handler h = new Handler();

        HttpContext serverContext = server.createContext("/test", h);

        serverContext.setAuthenticator(sa);

        server.setExecutor(e);

        server.start();

        return server;

    }

    public interface HttpRequestBuilderFactory extends Function<URI, HttpRequest.Builder> {

        default HttpRequest.Builder request(URI uri) {

            return this.apply(uri);

        }

    }

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

        ExecutorService e = Executors.newCachedThreadPool();

        ServerAuth sa = new ServerAuth("foo realm");

        HttpServer server = createServer(e, sa);

        int port = server.getAddress().getPort();

        System.out.println("Server port = " + port);

        ClientAuth ca = new ClientAuth();

        HttpClient client1 = HttpClient.newBuilder()

                                       .authenticator(ca)

                                       .build();

        HttpClient client2 = HttpClient.newBuilder()

                                       .authenticator(ca)

                                       .build();

        HttpClient client3 = HttpClient.newHttpClient();

        try {

            URI uri = new URI("http://localhost:" + port + "/test/foo");

            System.out.println("URI: " + uri);

            System.out.println("\nTesting with client #1, Authenticator #1");

            test(client1, ca, uri, 1, null);

            System.out.println("Testing again with client #1, Authenticator #1");

            test(client1, ca, uri, 1, null);

            System.out.println("Testing with client #2, Authenticator #1");

            test(client2, ca, uri, 2, null);

            System.out.println("Testing with default client"

                               + " (HttpClient.newHttpClient()), no authenticator");

            test(HttpClient.newHttpClient(), ca, uri, 2, IOException.class);

            System.out.println("\nSetting default authenticator\n");

            java.net.Authenticator.setDefault(ca);

            System.out.println("Testing default client"

                               + " (HttpClient.newHttpClient()), no authenticator");

            test(HttpClient.newHttpClient(), ca, uri, 3, IOException.class);

            System.out.println("Testing with client #4, no authenticator");

            test(client3, ca, uri, 4, IOException.class);

            String oldpwd = sa.passwd;

            sa.passwd = "changed";

            System.out.println("\nChanged server password\n");

            sa.passwd = "changed";

            System.out.println("\nChanged server password\n");

            System.out.println("Testing with client #1, Authenticator #1"

                                + " (count=" + ca.count.get() +")");

            test(client1, ca, uri, 7, IOException.class);

            System.out.println("Testing again with client #1, Authenticator #1"

                                + " (count=" + ca.count.get() +")");

            test(client1, ca, uri, 10, IOException.class);

            System.out.println("Testing with client #2, Authenticator #1"

                                + " (count=" + ca.count.get() +")");

            test(client2, ca, uri, 14, IOException.class);

            System.out.println("\nRestored server password"

                                + " (count=" + ca.count.get() +")\n");

            sa.passwd = oldpwd;

            int count = ca.count.get(); // depends on retry limit...

            System.out.println("Testing with client #1, Authenticator #1");

            test(client1, ca, uri, count+1, null);

            System.out.println("Testing again with client #1, Authenticator #1");

            test(client1, ca, uri, count+1, null);

            System.out.println("Testing with client #2, Authenticator #1");

            test(client2, ca, uri, count+2, null);

            sa.passwd = ca.passwd = "changed#2";

            System.out.println("\nChanged password on both sides\n");

            System.out.println("Testing with client #1, Authenticator #1");

            test(client1, ca, uri, count+3, null);

            System.out.println("Testing again with client #1, Authenticator #1");

            test(client1, ca, uri, count+3, null);

            System.out.println("Testing with client #2, Authenticator #1");

            test(client2, ca, uri, count+4, null);

        } finally {

            server.stop(0);

            e.shutdownNow();

        }

        System.out.println("OK");

    }

    static void test(HttpClient client,

                     ClientAuth ca,

                     URI uri,

                     int expectCount,

                     Class<? extends Exception> expectFailure)

        throws IOException, InterruptedException

    {

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

        HttpResponse resp;

        try {

            resp = client.send(req, BodyHandlers.ofString());

            ok = resp.statusCode() == 200 &&

                resp.body().equals(RESPONSE);

            if (resp.statusCode() == 401 || resp.statusCode() == 407) {

                throw new IOException(String.valueOf(resp));

            }

            if (expectFailure != null) {

                throw new RuntimeException("Expected " + expectFailure.getName()

                         +" not raised");

            }

        } catch (IOException io) {

            if (expectFailure != null) {

                if (expectFailure.isInstance(io)) {

                    System.out.println("Got expected exception: " + io);

                    return;

                }

            }

            throw io;

        }

        if (!ok || ca.count.get() != expectCount)

            throw new RuntimeException("Test failed: ok=" + ok

                 + " count=" + ca.count.get() + " (expected=" + expectCount+")");

        // repeat same request, should succeed but no additional authenticator calls

        resp = client.send(req, BodyHandlers.ofString());

        ok = resp.statusCode() == 200 &&

                resp.body().equals(RESPONSE);

        if (!ok || ca.count.get() != expectCount)

            throw new RuntimeException("Test failed: ok=" + ok

                 + " count=" + ca.count.get() + " (expected=" + expectCount+")");

        // try a POST

        req = HttpRequest.newBuilder(uri)

                         .POST(BodyPublishers.ofString(POST_BODY))

                         .build();

        resp = client.send(req, BodyHandlers.ofString());

        ok = resp.statusCode() == 200;

        if (!ok || ca.count.get() != expectCount)

            throw new RuntimeException("Test failed");

    }

    static class ServerAuth extends BasicAuthenticator {

        volatile String passwd = "passwd";

        ServerAuth(String realm) {

            super(realm);

        }

        @Override

        public boolean checkCredentials(String username, String password) {

            if (!"user".equals(username) || !passwd.equals(password)) {

                return false;

            }

            return true;

        }

    }

    static class ClientAuth extends java.net.Authenticator {

        final AtomicInteger count = new AtomicInteger();

        volatile String passwd = "passwd";

        @Override

        protected PasswordAuthentication getPasswordAuthentication() {

            count.incrementAndGet();

            return new PasswordAuthentication("user", passwd.toCharArray());

        }

    }

   static class Handler implements HttpHandler {

        static volatile boolean ok;

        @Override

        public void handle(HttpExchange he) throws IOException {

            String method = he.getRequestMethod();

            InputStream is = he.getRequestBody();

            if (method.equalsIgnoreCase("POST")) {

                String requestBody = new String(is.readAllBytes(), US_ASCII);

                if (!requestBody.equals(POST_BODY)) {

                    he.sendResponseHeaders(500, -1);

                    ok = false;

                } else {

                    he.sendResponseHeaders(200, -1);

                    ok = true;

                }

            } else { // GET

                he.sendResponseHeaders(200, RESPONSE.length());

                OutputStream os = he.getResponseBody();

                os.write(RESPONSE.getBytes(US_ASCII));

                os.close();

                ok = true;

            }

        }

   }

}