/*

 * 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  Verify that some special headers - such as User-Agent

 *           can be specified by the caller.

 * @bug 8203771

 * @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

 *          java.logging

 *          jdk.httpserver

 * @library /lib/testlibrary http2/server

 * @build Http2TestServer HttpServerAdapters SpecialHeadersTest

 * @build jdk.testlibrary.SimpleSSLContext

 * @run testng/othervm

 *       -Djdk.httpclient.HttpClient.log=requests,headers,errors

 *       SpecialHeadersTest

 */

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 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.HttpResponse;

import java.net.http.HttpResponse.BodyHandlers;

import java.security.AccessController;

import java.security.PrivilegedAction;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

import java.util.Locale;

import java.util.Map;

import static java.lang.System.err;

import static java.lang.System.out;

import static java.net.http.HttpClient.Builder.NO_PROXY;

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

import static org.testng.Assert.assertEquals;

public class SpecialHeadersTest implements HttpServerAdapters {

    SSLContext sslContext;

    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[][] headerNamesAndValues = new String[][]{

            {"User-Agent: <DEFAULT>"},

            {"User-Agent: camel-cased"},

            {"user-agent: all-lower-case"},

            {"user-Agent: mixed"},

    };

    @DataProvider(name = "variants")

    public Object[][] variants() {

        List<Object[]> list = new ArrayList<>();

        for (boolean sameClient : new boolean[] { false, true }) {

            Arrays.asList(headerNamesAndValues).stream()

                    .map(e -> new Object[] {httpURI, e[0], sameClient})

                    .forEach(list::add);

            Arrays.asList(headerNamesAndValues).stream()

                    .map(e -> new Object[] {httpsURI, e[0], sameClient})

                    .forEach(list::add);

            Arrays.asList(headerNamesAndValues).stream()

                    .map(e -> new Object[] {http2URI, e[0], sameClient})

                    .forEach(list::add);

            Arrays.asList(headerNamesAndValues).stream()

                    .map(e -> new Object[] {https2URI, e[0], sameClient})

                    .forEach(list::add);

        }

        return list.stream().toArray(Object[][]::new);

    }

    static final int ITERATION_COUNT = 3; // checks upgrade and re-use

    static String userAgent() {

        return "Java-http-client/" + System.getProperty("java.version");

    }

    static final Map<String, String> DEFAULTS = Map.of("USER-AGENT", userAgent());

    @Test(dataProvider = "variants")

    void test(String uriString, String headerNameAndValue, boolean sameClient) throws Exception {

        out.println("\n--- Starting ");

        int index = headerNameAndValue.indexOf(":");

        String name = headerNameAndValue.substring(0, index);

        String v = headerNameAndValue.substring(index+1).trim();

        String key = name.toUpperCase(Locale.ROOT);

        boolean useDefault = "<DEFAULT>".equals(v);

        String value =  useDefault ? DEFAULTS.get(key) : v;

        URI uri = URI.create(uriString+"?name="+key);

        HttpClient client = null;

        for (int i=0; i< ITERATION_COUNT; i++) {

            if (!sameClient || client == null)

                client = HttpClient.newBuilder()

                        .proxy(NO_PROXY)

                        .sslContext(sslContext)

                        .build();

            HttpRequest.Builder requestBuilder = HttpRequest.newBuilder(uri);

            if (!useDefault) {

                requestBuilder.header(name, value);

            }

            HttpRequest request = requestBuilder.build();

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

            out.println("Got response: " + resp);

            out.println("Got body: " + resp.body());

            assertEquals(resp.statusCode(), 200,

                    "Expected 200, got:" + resp.statusCode());

            String receivedHeaderString = value == null ? null

                    : resp.headers().firstValue("X-"+key).get();

            out.println("Got X-" + key + ": " + resp.headers().allValues("X-"+key));

            if (value != null) {

                assertEquals(receivedHeaderString, value);

                assertEquals(resp.headers().allValues("X-"+key), List.of(value));

            } else {

                assertEquals(resp.headers().allValues("X-"+key).size(), 0);

            }

        }

    }

    @Test(dataProvider = "variants")

    void testAsync(String uriString, String headerNameAndValue, boolean sameClient) {

        out.println("\n--- Starting ");

        int index = headerNameAndValue.indexOf(":");

        String name = headerNameAndValue.substring(0, index);

        String v = headerNameAndValue.substring(index+1).trim();

        String key = name.toUpperCase(Locale.ROOT);

        boolean useDefault = "<DEFAULT>".equals(v);

        String value =  useDefault ? DEFAULTS.get(key) : v;

        URI uri = URI.create(uriString+"?name="+key);

        HttpClient client = null;

        for (int i=0; i< ITERATION_COUNT; i++) {

            if (!sameClient || client == null)

                client = HttpClient.newBuilder()

                        .proxy(NO_PROXY)

                        .sslContext(sslContext)

                        .build();

            HttpRequest.Builder requestBuilder = HttpRequest.newBuilder(uri);

            if (!useDefault) {

                requestBuilder.header(name, value);

            }

            HttpRequest request = requestBuilder.build();

            client.sendAsync(request, BodyHandlers.ofString())

                    .thenApply(response -> {

                        out.println("Got response: " + response);

                        out.println("Got body: " + response.body());

                        assertEquals(response.statusCode(), 200);

                        return response;})

                    .thenAccept(resp -> {

                        String receivedHeaderString = value == null ? null

                                : resp.headers().firstValue("X-"+key).get();

                        out.println("Got X-" + key + ": " + resp.headers().allValues("X-"+key));

                        if (value != null) {

                            assertEquals(receivedHeaderString, value);

                            assertEquals(resp.headers().allValues("X-" + key), List.of(value));

                        } else {

                            assertEquals(resp.headers().allValues("X-" + key).size(), 1);

                        } })

                    .join();

        }

    }

    static String serverAuthority(HttpTestServer server) {

        return InetAddress.getLoopbackAddress().getHostName() + ":"

                + server.getAddress().getPort();

    }

    @BeforeTest

    public void setup() throws Exception {

        sslContext = new SimpleSSLContext().get();

        if (sslContext == null)

            throw new AssertionError("Unexpected null sslContext");

        HttpTestHandler handler = new HttpUriStringHandler();

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

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

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

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

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

        httpsServer.setHttpsConfigurator(new HttpsConfigurator(sslContext));

        httpsTestServer = HttpTestServer.of(httpsServer);

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

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

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

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

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

        https2TestServer = HttpTestServer.of(new Http2TestServer("localhost", true, 0));

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

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

        httpTestServer.start();

        httpsTestServer.start();

        http2TestServer.start();

        https2TestServer.start();

    }

    @AfterTest

    public void teardown() throws Exception {

        httpTestServer.stop();

        httpsTestServer.stop();

        http2TestServer.stop();

        https2TestServer.stop();

    }

    /** A handler that returns, as its body, the exact received request URI. */

    static class HttpUriStringHandler implements HttpTestHandler {

        @Override

        public void handle(HttpTestExchange t) throws IOException {

            URI uri = t.getRequestURI();

            String uriString = uri.toString();

            out.println("Http1UriStringHandler received, uri: " + uriString);

            String query = uri.getQuery();

            String headerName = query.substring(query.indexOf("=")+1).trim();

            try (InputStream is = t.getRequestBody();

                 OutputStream os = t.getResponseBody()) {

                is.readAllBytes();

                byte[] bytes = uriString.getBytes(US_ASCII);

                t.getRequestHeaders().keySet().stream()

                        .filter(headerName::equalsIgnoreCase)

                        .forEach(h -> {

                            for (String v : t.getRequestHeaders().get(headerName)) {

                                t.getResponseHeaders().addHeader("X-"+h, v);

                            }

                        });

                t.sendResponseHeaders(200, bytes.length);

                os.write(bytes);

            }

        }

    }

}