/*

 * Copyright (c) 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @summary Method change during redirection

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

 *          java.net.http/jdk.internal.net.http.common

 *          java.net.http/jdk.internal.net.http.frame

 *          java.net.http/jdk.internal.net.http.hpack

 *          jdk.httpserver

 * @library /lib/testlibrary /test/lib http2/server

 * @build Http2TestServer

 * @build jdk.testlibrary.SimpleSSLContext

 * @run testng/othervm RedirectMethodChange

 */

import javax.net.ssl.SSLContext;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.InetAddress;

import java.net.InetSocketAddress;

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 com.sun.net.httpserver.HttpServer;

import com.sun.net.httpserver.HttpsConfigurator;

import com.sun.net.httpserver.HttpsServer;

import jdk.testlibrary.SimpleSSLContext;

import org.testng.annotations.AfterTest;

import org.testng.annotations.BeforeTest;

import org.testng.annotations.DataProvider;

import org.testng.annotations.Test;

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

import static org.testng.Assert.assertEquals;

public class RedirectMethodChange implements HttpServerAdapters {

    SSLContext sslContext;

    HttpClient client;

    HttpTestServer httpTestServer;        // HTTP/1.1    [ 4 servers ]

    HttpTestServer httpsTestServer;       // HTTPS/1.1

    HttpTestServer http2TestServer;       // HTTP/2 ( h2c )

    HttpTestServer https2TestServer;      // HTTP/2 ( h2  )

    String httpURI;

    String httpsURI;

    String http2URI;

    String https2URI;

    static final String RESPONSE = "Hello world";

    static final String POST_BODY = "This is the POST body 123909090909090";

    static HttpRequest.BodyPublisher getRequestBodyFor(String method) {

        switch (method) {

            case "GET":

            case "DELETE":

            case "HEAD":

                return BodyPublishers.noBody();

            case "POST":

            case "PUT":

                return BodyPublishers.ofString(POST_BODY);

            default:

                throw new AssertionError("Unknown method:" + method);

        }

    }

    @DataProvider(name = "variants")

    public Object[][] variants() {

        return new Object[][] {

                { httpURI, "GET",  301, "GET"  },

                { httpURI, "GET",  302, "GET"  },

                { httpURI, "GET",  303, "GET"  },

                { httpURI, "GET",  307, "GET"  },

                { httpURI, "GET",  308, "GET"  },

                { httpURI, "POST", 301, "GET"  },

                { httpURI, "POST", 302, "GET"  },

                { httpURI, "POST", 303, "GET"  },

                { httpURI, "POST", 307, "POST" },

                { httpURI, "POST", 308, "POST" },

                { httpURI, "PUT",  301, "PUT"  },

                { httpURI, "PUT",  302, "PUT"  },

                { httpURI, "PUT",  303, "GET"  },

                { httpURI, "PUT",  307, "PUT"  },

                { httpURI, "PUT",  308, "PUT"  },

                { httpsURI, "GET",  301, "GET"  },

                { httpsURI, "GET",  302, "GET"  },

                { httpsURI, "GET",  303, "GET"  },

                { httpsURI, "GET",  307, "GET"  },

                { httpsURI, "GET",  308, "GET"  },

                { httpsURI, "POST", 301, "GET"  },

                { httpsURI, "POST", 302, "GET"  },

                { httpsURI, "POST", 303, "GET"  },

                { httpsURI, "POST", 307, "POST" },

                { httpsURI, "POST", 308, "POST" },

                { httpsURI, "PUT",  301, "PUT"  },

                { httpsURI, "PUT",  302, "PUT"  },

                { httpsURI, "PUT",  303, "GET"  },

                { httpsURI, "PUT",  307, "PUT"  },

                { httpsURI, "PUT",  308, "PUT"  },

                { http2URI, "GET",  301, "GET"  },

                { http2URI, "GET",  302, "GET"  },

                { http2URI, "GET",  303, "GET"  },

                { http2URI, "GET",  307, "GET"  },

                { http2URI, "GET",  308, "GET"  },

                { http2URI, "POST", 301, "GET"  },

                { http2URI, "POST", 302, "GET"  },

                { http2URI, "POST", 303, "GET"  },

                { http2URI, "POST", 307, "POST" },

                { http2URI, "POST", 308, "POST" },

                { http2URI, "PUT",  301, "PUT"  },

                { http2URI, "PUT",  302, "PUT"  },

                { http2URI, "PUT",  303, "GET"  },

                { http2URI, "PUT",  307, "PUT"  },

                { http2URI, "PUT",  308, "PUT"  },

                { https2URI, "GET",  301, "GET"  },

                { https2URI, "GET",  302, "GET"  },

                { https2URI, "GET",  303, "GET"  },

                { https2URI, "GET",  307, "GET"  },

                { https2URI, "GET",  308, "GET"  },

                { https2URI, "POST", 301, "GET"  },

                { https2URI, "POST", 302, "GET"  },

                { https2URI, "POST", 303, "GET"  },

                { https2URI, "POST", 307, "POST" },

                { https2URI, "POST", 308, "POST" },

                { https2URI, "PUT",  301, "PUT"  },

                { https2URI, "PUT",  302, "PUT"  },

                { https2URI, "PUT",  303, "GET"  },

                { https2URI, "PUT",  307, "PUT"  },

                { https2URI, "PUT",  308, "PUT"  },

        };

    }

    @Test(dataProvider = "variants")

    public void test(String uriString,

                     String method,

                     int redirectCode,

                     String expectedMethod)

        throws Exception

    {

        HttpRequest req = HttpRequest.newBuilder(URI.create(uriString))

                .method(method, getRequestBodyFor(method))

                .header("X-Redirect-Code", Integer.toString(redirectCode))

                .header("X-Expect-Method", expectedMethod)

                .build();

        HttpResponse<String> resp = client.send(req, BodyHandlers.ofString());

        System.out.println("Response: " + resp + ", body: " + resp.body());

        assertEquals(resp.statusCode(), 200);

        assertEquals(resp.body(), RESPONSE);

    }

    // -- Infrastructure

    @BeforeTest

    public void setup() throws Exception {

        sslContext = new SimpleSSLContext().get();

        if (sslContext == null)

            throw new AssertionError("Unexpected null sslContext");

        client = HttpClient.newBuilder()

                .followRedirects(HttpClient.Redirect.NORMAL)

                .sslContext(sslContext)

                .build();

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

        httpTestServer = HttpTestServer.of(HttpServer.create(sa, 0));

        String targetURI = "http://" + httpTestServer.serverAuthority() + "/http1/redirect/rmt";

        RedirMethodChgeHandler handler = new RedirMethodChgeHandler(targetURI);

        httpTestServer.addHandler(handler, "/http1/");

        httpURI = "http://" + httpTestServer.serverAuthority() + "/http1/test/rmt";

        HttpsServer httpsServer = HttpsServer.create(sa, 0);

        httpsServer.setHttpsConfigurator(new HttpsConfigurator(sslContext));

        httpsTestServer = HttpTestServer.of(httpsServer);

        targetURI = "https://" + httpsTestServer.serverAuthority() + "/https1/redirect/rmt";

        handler = new RedirMethodChgeHandler(targetURI);

        httpsTestServer.addHandler(handler,"/https1/");

        httpsURI = "https://" + httpsTestServer.serverAuthority() + "/https1/test/rmt";

        http2TestServer = HttpTestServer.of(new Http2TestServer("localhost", false, 0));

        targetURI = "http://" + http2TestServer.serverAuthority() + "/http2/redirect/rmt";

        handler = new RedirMethodChgeHandler(targetURI);

        http2TestServer.addHandler(handler, "/http2/");

        http2URI = "http://" + http2TestServer.serverAuthority() + "/http2/test/rmt";

        targetURI = "https://" + https2TestServer.serverAuthority() + "/https2/redirect/rmt";

        handler = new RedirMethodChgeHandler(targetURI);

        https2TestServer.addHandler(handler, "/https2/");

        https2URI = "https://" + https2TestServer.serverAuthority() + "/https2/test/rmt";

        httpTestServer.start();

        httpsTestServer.start();

        http2TestServer.start();

        https2TestServer.start();

    }

    @AfterTest

    public void teardown() throws Exception {

        httpTestServer.stop();

        httpsTestServer.stop();

        http2TestServer.stop();

        https2TestServer.stop();

    }

    /**

     * Stateful handler.

     *

     * Request to "<protocol>/test/rmt" is first, with the following checked

     * headers:

     *   X-Redirect-Code: nnn    <the redirect code to send back>

     *   X-Expect-Method: the method that the client should use for the next request

     *

     * The following request should be to "<protocol>/redirect/rmt" and should

     * use the method indicated previously. If all ok, return a 200 response.

     * Otherwise 50X error.

     */

    static class RedirMethodChgeHandler implements HttpTestHandler {

        boolean inTest;

        String expectedMethod;

        final String targetURL;

        RedirMethodChgeHandler(String targetURL) {

            this.targetURL = targetURL;

        }

        boolean readAndCheckBody(HttpTestExchange e) throws IOException {

            String method = e.getRequestMethod();

            String requestBody;

            try (InputStream is = e.getRequestBody()) {

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

            }

            if ((method.equals("POST") || method.equals("PUT"))

                    && !requestBody.equals(POST_BODY)) {

                Throwable ex = new RuntimeException("Unexpected request body for "

                        + method + ": [" + requestBody +"]");

                ex.printStackTrace();

                e.sendResponseHeaders(503, 0);

                return false;

            }

            return true;

        }

        @Override

        public synchronized void handle(HttpTestExchange he) throws IOException {

            boolean newtest = he.getRequestURI().getPath().endsWith("/test/rmt");

            if ((newtest && inTest) || (!newtest && !inTest)) {

                Throwable ex = new RuntimeException("Unexpected newtest:" + newtest

                        + ", inTest:" + inTest +  ", for " + he.getRequestURI());

                ex.printStackTrace();

                he.sendResponseHeaders(500, 0);

                return;

            }

            if (newtest) {

                HttpTestRequestHeaders hdrs = he.getRequestHeaders();

                String value = hdrs.firstValue("X-Redirect-Code").get();

                int redirectCode = Integer.parseInt(value);

                expectedMethod = hdrs.firstValue("X-Expect-Method").get();

                if (!readAndCheckBody(he))

                    return;

                HttpTestResponseHeaders headersbuilder = he.getResponseHeaders();

                headersbuilder.addHeader("Location", targetURL);

                he.sendResponseHeaders(redirectCode, 0);

                inTest = true;

            } else {

                // should be the redirect

                if (!he.getRequestURI().getPath().endsWith("/redirect/rmt")) {

                    Throwable ex = new RuntimeException("Unexpected redirected request, got:"

                            + he.getRequestURI());

                    ex.printStackTrace();

                    he.sendResponseHeaders(501, 0);

                } else if (!he.getRequestMethod().equals(expectedMethod)) {

                    Throwable ex = new RuntimeException("Expected: " + expectedMethod

                            + " Got: " + he.getRequestMethod());

                    ex.printStackTrace();

                    he.sendResponseHeaders(504, 0);

                } else {

                    if (!readAndCheckBody(he))

                        return;

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

                    try (OutputStream os = he.getResponseBody()) {

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

                    }

                }

                inTest = false;

            }

        }

    }

}