/*

 * 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.

 */

import com.sun.net.httpserver.HttpExchange;

import com.sun.net.httpserver.HttpHandler;

import com.sun.net.httpserver.HttpServer;

import jdk.test.lib.net.URIBuilder;

import org.testng.Assert;

import org.testng.annotations.AfterTest;

import org.testng.annotations.BeforeTest;

import org.testng.annotations.Test;

import sun.net.spi.DefaultProxySelector;

import java.io.IOException;

import java.net.HttpURLConnection;

import java.net.InetAddress;

import java.net.InetSocketAddress;

import java.net.Proxy;

import java.net.ProxySelector;

import java.net.URI;

import java.net.URISyntaxException;

import java.net.URL;

import java.util.List;

/**

 * @test

 * @bug 6563286 6797318 8177648 8230220

 * @summary Tests that sun.net.www.protocol.http.HttpURLConnection when dealing with

 * sun.net.spi.DefaultProxySelector#select() handles any IllegalArgumentException

 * correctly

 * @library /test/lib

 * @run testng HttpURLProxySelectionTest

 * @modules java.base/sun.net.spi:+open

 */

public class HttpURLProxySelectionTest {

    private static final String WEB_APP_CONTEXT = "/httpurlproxytest";

    private HttpServer server;

    private SimpleHandler handler;

    private ProxySelector previousDefault;

    private CustomProxySelector ourProxySelector = new CustomProxySelector();

    @BeforeTest

    public void beforeTest() throws Exception {

        previousDefault = ProxySelector.getDefault();

        ProxySelector.setDefault(ourProxySelector);

        handler = new SimpleHandler();

        server = createServer(handler);

    }

    @AfterTest

    public void afterTest() {

        try {

            if (server != null) {

                final int delaySeconds = 0;

                server.stop(delaySeconds);

            }

        } finally {

            ProxySelector.setDefault(previousDefault);

        }

    }

    /**

     * - Test initiates a HTTP request to server

     * - Server receives request and sends a 301 redirect to an URI which doesn't have a "host"

     * - Redirect is expected to fail with IOException (caused by IllegalArgumentException from DefaultProxySelector)

     *

     * @throws Exception

     */

    @Test

    public void test() throws Exception {

        final URL targetURL = URIBuilder.newBuilder()

                .scheme("http")

                .host(server.getAddress().getAddress())

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

                .path(WEB_APP_CONTEXT)

                .toURL();

        System.out.println("Sending request to " + targetURL);

        final HttpURLConnection conn = (HttpURLConnection) targetURL.openConnection();

        try {

            conn.getResponseCode();

            Assert.fail("Request to " + targetURL + " was expected to fail during redirect");

        } catch (IOException ioe) {

            // expected because of the redirect to an invalid URL, for which a proxy can't be selected

            // make sure the it was indeed a redirect

            Assert.assertTrue(handler.redirectSent, "Server was expected to send a redirect, but didn't");

            Assert.assertTrue(ourProxySelector.selectorUsedForRedirect, "Proxy selector wasn't used for redirect");

            // make sure the IOException was caused by an IllegalArgumentException

            Assert.assertTrue(ioe.getCause() instanceof IllegalArgumentException, "Unexpected cause in the IOException");

        }

    }

    private static HttpServer createServer(final HttpHandler handler) throws IOException {

        final InetSocketAddress serverAddr = new InetSocketAddress(InetAddress.getLoopbackAddress(), 0);

        final int backlog = -1;

        final HttpServer server = HttpServer.create(serverAddr, backlog);

        // setup the handler

        server.createContext(WEB_APP_CONTEXT, handler);

        // start the server

        server.start();

        System.out.println("Server started on " + server.getAddress());

        return server;

    }

    private static class SimpleHandler implements HttpHandler {

        private volatile boolean redirectSent = false;

        @Override

        public void handle(final HttpExchange httpExchange) throws IOException {

            final String redirectURL;

            try {

                redirectURL = new URI("http", "/irrelevant", null).toString();

            } catch (URISyntaxException e) {

                throw new IOException(e);

            }

            httpExchange.getResponseHeaders().add("Location", redirectURL);

            final URI requestURI = httpExchange.getRequestURI();

            System.out.println("Handling " + httpExchange.getRequestMethod() + " request "

                    + requestURI + " responding with redirect to " + redirectURL);

            this.redirectSent = true;

            httpExchange.sendResponseHeaders(301, -1);

        }

    }

    private static class CustomProxySelector extends DefaultProxySelector {

        private volatile boolean selectorUsedForRedirect = false;

        @Override

        public List<Proxy> select(final URI uri) {

            if (uri.toString().contains("/irrelevant")) {

                this.selectorUsedForRedirect = true;

            }

            return super.select(uri);

        }

    }

}