/*

 * Copyright (c) 2015, 2017, 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

 * @bug 8156514

 * @library /lib/testlibrary server

 * @build jdk.testlibrary.SimpleSSLContext

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

 * @run testng/othervm -Djdk.httpclient.HttpClient.log=frames,ssl,requests,responses,errors RedirectTest

 */

import java.net.*;

import java.net.http.*;

import java.util.Optional;

import java.util.concurrent.*;

import java.util.function.*;

import java.util.Arrays;

import java.util.Iterator;

import org.testng.annotations.Test;

import static java.net.http.HttpClient.Version.HTTP_2;

import static java.net.http.HttpRequest.BodyPublisher.fromString;

import static java.net.http.HttpResponse.BodyHandler.asString;

public class RedirectTest {

    static int httpPort;

    static Http2TestServer httpServer;

    static HttpClient client;

    static String httpURIString, altURIString1, altURIString2;

    static URI httpURI, altURI1, altURI2;

    static Supplier<String> sup(String... args) {

        Iterator<String> i = Arrays.asList(args).iterator();

        // need to know when to stop calling it.

        return () -> i.next();

    }

    static class Redirector extends Http2RedirectHandler {

        private InetSocketAddress remoteAddr;

        private boolean error = false;

        Redirector(Supplier<String> supplier) {

            super(supplier);

        }

        protected synchronized void examineExchange(Http2TestExchange ex) {

            InetSocketAddress addr = ex.getRemoteAddress();

            if (remoteAddr == null) {

                remoteAddr = addr;

                return;

            }

            // check that the client addr/port stays the same, proving

            // that the connection didn't get dropped.

            if (!remoteAddr.equals(addr)) {

                System.err.printf("Error %s/%s\n", remoteAddr.toString(),

                        addr.toString());

                error = true;

            }

        }

        public synchronized boolean error() {

            return error;

        }

    }

    static void initialize() throws Exception {

        try {

            client = getClient();

            httpServer = new Http2TestServer(false, 0, null, null);

            httpPort = httpServer.getAddress().getPort();

            // urls are accessed in sequence below. The first two are on

            // different servers. Third on same server as second. So, the

            // client should use the same http connection.

            httpURIString = "http://127.0.0.1:" + httpPort + "/foo/";

            httpURI = URI.create(httpURIString);

            altURIString1 = "http://127.0.0.1:" + httpPort + "/redir";

            altURI1 = URI.create(altURIString1);

            altURIString2 = "http://127.0.0.1:" + httpPort + "/redir_again";

            altURI2 = URI.create(altURIString2);

            Redirector r = new Redirector(sup(altURIString1, altURIString2));

            httpServer.addHandler(r, "/foo");

            httpServer.addHandler(r, "/redir");

            httpServer.addHandler(new Http2EchoHandler(), "/redir_again");

            httpServer.start();

        } catch (Throwable e) {

            System.err.println("Throwing now");

            e.printStackTrace();

            throw e;

        }

    }

    @Test

    public static void test() throws Exception {

        try {

            initialize();

            simpleTest();

        } finally {

            httpServer.stop();

        }

    }

    static HttpClient getClient() {

        if (client == null) {

            client = HttpClient.newBuilder()

                               .followRedirects(HttpClient.Redirect.ALWAYS)

                               .version(HTTP_2)

                               .build();

        }

        return client;

    }

    static URI getURI() {

        return URI.create(httpURIString);

    }

    static void checkStatus(int expected, int found) throws Exception {

        if (expected != found) {

            System.err.printf ("Test failed: wrong status code %d/%d\n",

                expected, found);

            throw new RuntimeException("Test failed");

        }

    }

    static void checkURIs(URI expected, URI found) throws Exception {

        System.out.printf ("Expected: %s, Found: %s\n", expected.toString(), found.toString());

        if (!expected.equals(found)) {

            System.err.printf ("Test failed: wrong URI %s/%s\n",

                expected.toString(), found.toString());

            throw new RuntimeException("Test failed");

        }

    }

    static void checkStrings(String expected, String found) throws Exception {

        if (!expected.equals(found)) {

            System.err.printf ("Test failed: wrong string %s/%s\n",

                expected, found);

            throw new RuntimeException("Test failed");

        }

    }

    static void check(boolean cond, Object... msg) {

        if (cond)

            return;

        StringBuilder sb = new StringBuilder();

        for (Object o : msg)

            sb.append(o);

        throw new RuntimeException(sb.toString());

    }

    static final String SIMPLE_STRING = "Hello world Goodbye world";

    static void simpleTest() throws Exception {

        URI uri = getURI();

        System.err.println("Request to " + uri);

        HttpClient client = getClient();

        HttpRequest req = HttpRequest.newBuilder(uri)

                                     .POST(fromString(SIMPLE_STRING))

                                     .build();

        CompletableFuture<HttpResponse<String>> cf = client.sendAsync(req, asString());

        HttpResponse<String> response = cf.join();

        checkStatus(200, response.statusCode());

        String responseBody = response.body();

        checkStrings(SIMPLE_STRING, responseBody);

        checkURIs(response.uri(), altURI2);

        // check two previous responses

        HttpResponse<String> prev = response.previousResponse()

            .orElseThrow(() -> new RuntimeException("no previous response"));

        checkURIs(prev.uri(), altURI1);

        prev = prev.previousResponse()

            .orElseThrow(() -> new RuntimeException("no previous response"));

        checkURIs(prev.uri(), httpURI);

        checkPreviousRedirectResponses(req, response);

        System.err.println("DONE");

    }

    static void checkPreviousRedirectResponses(HttpRequest initialRequest,

                                               HttpResponse<?> finalResponse) {

        // there must be at least one previous response

        finalResponse.previousResponse()

                .orElseThrow(() -> new RuntimeException("no previous response"));

        HttpResponse<?> response = finalResponse;

        do {

            URI uri = response.uri();

            response = response.previousResponse().get();

            check(300 <= response.statusCode() && response.statusCode() <= 309,

                    "Expected 300 <= code <= 309, got:" + response.statusCode());

            check(response.body() == null, "Unexpected body: " + response.body());

            String locationHeader = response.headers().firstValue("Location")

                    .orElseThrow(() -> new RuntimeException("no previous Location"));

            check(uri.toString().endsWith(locationHeader),

                    "URI: " + uri + ", Location: " + locationHeader);

        } while (response.previousResponse().isPresent());

        // initial

        check(initialRequest.equals(response.request()),

                "Expected initial request [%s] to equal last prev req [%s]",

                initialRequest, response.request());

    }

}