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 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.hc.core5.testing.nio;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

import java.net.InetSocketAddress;
import java.util.Arrays;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;

import org.apache.hc.core5.function.Supplier;
import org.apache.hc.core5.http.ContentType;
import org.apache.hc.core5.http.HttpHost;
import org.apache.hc.core5.http.HttpResponse;
import org.apache.hc.core5.http.HttpStatus;
import org.apache.hc.core5.http.Message;
import org.apache.hc.core5.http.Method;
import org.apache.hc.core5.http.URIScheme;
import org.apache.hc.core5.http.impl.bootstrap.HttpAsyncServer;
import org.apache.hc.core5.http.nio.AsyncServerExchangeHandler;
import org.apache.hc.core5.http.nio.entity.StringAsyncEntityConsumer;
import org.apache.hc.core5.http.nio.entity.StringAsyncEntityProducer;
import org.apache.hc.core5.http.nio.ssl.BasicServerTlsStrategy;
import org.apache.hc.core5.http.nio.ssl.TlsStrategy;
import org.apache.hc.core5.http.nio.support.BasicRequestProducer;
import org.apache.hc.core5.http.nio.support.BasicResponseConsumer;
import org.apache.hc.core5.http2.impl.nio.ProtocolNegotiationException;
import org.apache.hc.core5.http2.impl.nio.bootstrap.H2MultiplexingRequester;
import org.apache.hc.core5.http2.impl.nio.bootstrap.H2MultiplexingRequesterBootstrap;
import org.apache.hc.core5.http2.impl.nio.bootstrap.H2ServerBootstrap;
import org.apache.hc.core5.http2.ssl.H2ClientTlsStrategy;
import org.apache.hc.core5.http2.ssl.H2ServerTlsStrategy;
import org.apache.hc.core5.io.CloseMode;
import org.apache.hc.core5.reactor.IOReactorConfig;
import org.apache.hc.core5.reactor.ListenerEndpoint;
import org.apache.hc.core5.testing.SSLTestContexts;
import org.apache.hc.core5.util.ReflectionUtils;
import org.apache.hc.core5.util.Timeout;
import org.hamcrest.CoreMatchers;
import org.hamcrest.MatcherAssert;
import org.junit.Assume;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExternalResource;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@RunWith(Parameterized.class)
public class H2AlpnTest {
    private final Logger log = LoggerFactory.getLogger(getClass());

    private static final Timeout TIMEOUT = Timeout.ofSeconds(30);

    @Parameters(name = "strict h2 ALPN: {0}, h2 allowed: {1}")
    public static Iterable<Object[]> parameters() {
        return Arrays.asList(new Object[][] {
            { true, true },
            { true, false },
            { false, true }
        });
    }

    private final boolean strictALPN;
    private final boolean h2Allowed;

    public H2AlpnTest(final boolean strictALPN, final boolean h2Allowed) {
        this.strictALPN = strictALPN;
        this.h2Allowed = h2Allowed;
    }

    private HttpAsyncServer server;

    @Rule
    public ExternalResource serverResource = new ExternalResource() {

        @Override
        protected void before() throws Throwable {
            log.debug("Starting up test server");
            final TlsStrategy tlsStrategy = h2Allowed ?
                new H2ServerTlsStrategy(SSLTestContexts.createServerSSLContext()) :
                new BasicServerTlsStrategy(SSLTestContexts.createServerSSLContext());
            server = H2ServerBootstrap.bootstrap()
                    .setIOReactorConfig(
                            IOReactorConfig.custom()
                                    .setSoTimeout(TIMEOUT)
                                    .build())
                    .setTlsStrategy(tlsStrategy)
                    .setStreamListener(LoggingH2StreamListener.INSTANCE)
                    .setIOSessionDecorator(LoggingIOSessionDecorator.INSTANCE)
                    .setExceptionCallback(LoggingExceptionCallback.INSTANCE)
                    .setIOSessionListener(LoggingIOSessionListener.INSTANCE)
                    .register("*", new Supplier<AsyncServerExchangeHandler>() {

                        @Override
                        public AsyncServerExchangeHandler get() {
                            return new EchoHandler(2048);
                        }

                    })
                    .create();
        }

        @Override
        protected void after() {
            log.debug("Shutting down test server");
            if (server != null) {
                server.close(CloseMode.GRACEFUL);
            }
        }

    };

    private H2MultiplexingRequester requester;

    @Rule
    public ExternalResource clientResource = new ExternalResource() {

        @Override
        protected void before() throws Throwable {
            log.debug("Starting up test client");
            requester = H2MultiplexingRequesterBootstrap.bootstrap()
                    .setIOReactorConfig(IOReactorConfig.custom()
                            .setSoTimeout(TIMEOUT)
                            .build())
                    .setTlsStrategy(new H2ClientTlsStrategy(SSLTestContexts.createClientSSLContext()))
                    .setStrictALPNHandshake(strictALPN)
                    .setStreamListener(LoggingH2StreamListener.INSTANCE)
                    .setIOSessionDecorator(LoggingIOSessionDecorator.INSTANCE)
                    .setExceptionCallback(LoggingExceptionCallback.INSTANCE)
                    .setIOSessionListener(LoggingIOSessionListener.INSTANCE)
                    .create();
        }

        @Override
        protected void after() {
            log.debug("Shutting down test client");
            if (requester != null) {
                requester.close(CloseMode.GRACEFUL);
            }
        }

    };

    private static int JAVA_VER;

    @BeforeClass
    public static void determineJavaVersion() {
        JAVA_VER = ReflectionUtils.determineJRELevel();
    }

    @Before
    public void checkVersion() {
        Assume.assumeTrue("Java version must be 9 or greater and less than 16", JAVA_VER >= 9 && JAVA_VER < 16);
    }

    @Test
    public void testALPN() throws Exception {
        server.start();
        final Future<ListenerEndpoint> future = server.listen(new InetSocketAddress(0), URIScheme.HTTPS);
        final ListenerEndpoint listener = future.get();
        final InetSocketAddress address = (InetSocketAddress) listener.getAddress();
        requester.start();

        final HttpHost target = new HttpHost(URIScheme.HTTPS.id, "localhost", address.getPort());
        final Future<Message<HttpResponse, String>> resultFuture1 = requester.execute(
            new BasicRequestProducer(Method.POST, target, "/stuff",
                new StringAsyncEntityProducer("some stuff", ContentType.TEXT_PLAIN)),
            new BasicResponseConsumer<>(new StringAsyncEntityConsumer()), TIMEOUT, null);
        final Message<HttpResponse, String> message1;
        try {
            message1 = resultFuture1.get(TIMEOUT.getDuration(), TIMEOUT.getTimeUnit());
        } catch (final ExecutionException e) {
            final Throwable cause = e.getCause();
            assertFalse("h2 negotiation was enabled, but h2 was not negotiated", h2Allowed);
            assertTrue(cause instanceof ProtocolNegotiationException);
            assertEquals("ALPN: missing application protocol", cause.getMessage());
            assertTrue("strict ALPN mode was not enabled, but the client negotiator still threw", strictALPN);
            return;
        }

        assertTrue("h2 negotiation was disabled, but h2 was negotiated", h2Allowed);
        MatcherAssert.assertThat(message1, CoreMatchers.notNullValue());
        final HttpResponse response1 = message1.getHead();
        MatcherAssert.assertThat(response1.getCode(), CoreMatchers.equalTo(HttpStatus.SC_OK));
        final String body1 = message1.getBody();
        MatcherAssert.assertThat(body1, CoreMatchers.equalTo("some stuff"));
    }
}
