/*
 * Copyright (c) 2002, 2021, 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 4678055
 * @library /test/lib
 * @run main/othervm B4678055
 * @run main/othervm -Djava.net.preferIPv6Addresses=true B4678055
 * @summary Basic Authentication fails with multiple realms
 */

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.net.Authenticator;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.PasswordAuthentication;
import java.net.ProxySelector;
import java.net.URL;
import java.net.URLConnection;
import java.util.concurrent.Executors;

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 B4678055 implements HttpHandler {

    static volatile int count = 0;
    static volatile String authstring;

    private void errorReply(HttpExchange req, String reply) throws IOException {
        req.getResponseHeaders().set("Connection", "close");
        req.getResponseHeaders().set("WWW-Authenticate", reply);
        req.sendResponseHeaders(401, -1);
    }

    private void okReply (HttpExchange req) throws IOException {
        req.sendResponseHeaders(200, 0);
        try(PrintWriter pw = new PrintWriter(req.getResponseBody())) {
            pw.print("Hello .");
        }
    }

    public void handle (HttpExchange req) {
        try {
            System.out.println("Server handling case: "+ count);
            if(req.getRequestHeaders().get("Authorization") != null) {
                authstring = req.getRequestHeaders().get("Authorization").get(0);
                System.out.println(authstring);
            }
            switch (count) {
            case 0:
                errorReply (req, "Basic realm=\"wallyworld\"");
                break;
            case 1:
                /* client stores a username/pw for wallyworld
                 */
                okReply (req);
                break;
            case 2:
                /* emulates a server that has configured a second
                 * realm, but by misconfiguration uses the same
                 * realm string as the previous one.
                 *
                 * An alternative (more likely) scenario that shows this behavior is
                 * the case where the password in the original realm has changed
                 */
                errorReply (req, "Basic realm=\"wallyworld\"");
                break;
            case 3:
                /* The client replies with the username/password
                 * from the first realm, which is wrong (unexpectedly)
                 */
                errorReply (req, "Basic realm=\"wallyworld\"");
                break;
            case 4:
                /* The client re-prompts for a password and
                 * we now reply with an OK. The client with the bug
                 * will throw NPE at this point.
                 */
            case 5:
                /* Repeat the OK, to make sure the same new auth string is sent */
                okReply (req);
                break;
            }
            count ++;
        } catch (IOException e) {
            System.err.println("Unexpected exception for case " + count + ": " + e);
            e.printStackTrace();
        }
    }

    static void read (InputStream is) throws IOException {
        int c;
        System.out.println ("reading");
        while ((c=is.read()) != -1) {
            System.out.write (c);
        }
        System.out.println ("");
        System.out.println ("finished reading");
    }

    static boolean checkFinalAuth () {
        return authstring.equals ("Basic dXNlcjpwYXNzMg==");
    }

    static void client (String u) throws Exception {
        URL url = new URL (u);
        System.out.println ("client opening connection to: " + u);
        URLConnection urlc = url.openConnection ();
        InputStream is = urlc.getInputStream ();
        read (is);
        is.close();
    }

    static HttpServer server;

    public static void main (String[] args) throws Exception {
        B4678055 b4678055 = new B4678055();
        MyAuthenticator auth = new MyAuthenticator ();
        Authenticator.setDefault (auth);
        ProxySelector.setDefault(ProxySelector.of(null)); // no proxy
        try {
            InetAddress loopback = InetAddress.getLoopbackAddress();
            server = HttpServer.create(new InetSocketAddress(loopback, 0), 10);
            server.createContext("/", b4678055);
            server.setExecutor(Executors.newSingleThreadExecutor());
            server.start();
            String serverURL = URIBuilder.newBuilder()
                .scheme("http")
                .loopback()
                .port(server.getAddress().getPort())
                .path("/")
                .build()
                .toString();
            System.out.println("Server: listening at: " + serverURL);
            client(serverURL + "d1/foo.html");
            client(serverURL + "d2/foo.html");
            client(serverURL + "d2/foo.html");
        } catch (Exception e) {
            System.out.println("Client got exception: " + e);
            System.out.println("Terminating server");
            if (server != null) {
                server.stop(1);
            }
            throw e;
        }
        int f = auth.getCount();
        if (f != 2) {
            except ("Authenticator was called "+f+" times. Should be 2");
        }
        /* this checks the authorization string corresponding to second password "pass2"*/
        if (!checkFinalAuth()) {
            except ("Wrong authorization string received from client");
        }
        System.out.println("Terminating server");
        server.stop(1);
    }

    public static void except (String s) {
        System.out.println("Check failed: " + s);
        System.out.println("Terminating server");
        server.stop(1);
        throw new RuntimeException (s);
    }

    static class MyAuthenticator extends Authenticator {
        MyAuthenticator () {
            super ();
        }

        volatile int count = 0;

        public PasswordAuthentication getPasswordAuthentication () {
            PasswordAuthentication pw;
            if (count == 0) {
                pw = new PasswordAuthentication ("user", "pass1".toCharArray());
            } else {
                pw = new PasswordAuthentication ("user", "pass2".toCharArray());
            }
            count ++;
            return pw;
        }

        public int getCount () {
            return (count);
        }
    }
}