/*
 * ====================================================================
 * 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.client5.http.examples;

import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.concurrent.Future;

import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;

import org.apache.hc.client5.http.async.methods.SimpleHttpRequest;
import org.apache.hc.client5.http.async.methods.SimpleHttpResponse;
import org.apache.hc.client5.http.async.methods.SimpleRequestProducer;
import org.apache.hc.client5.http.async.methods.SimpleResponseConsumer;
import org.apache.hc.client5.http.impl.async.CloseableHttpAsyncClient;
import org.apache.hc.client5.http.impl.async.HttpAsyncClients;
import org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManager;
import org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManagerBuilder;
import org.apache.hc.client5.http.protocol.HttpClientContext;
import org.apache.hc.client5.http.ssl.H2TlsStrategy;
import org.apache.hc.core5.concurrent.FutureCallback;
import org.apache.hc.core5.http.HttpHost;
import org.apache.hc.core5.http.nio.ssl.TlsStrategy;
import org.apache.hc.core5.io.ShutdownType;
import org.apache.hc.core5.ssl.SSLContexts;
import org.apache.hc.core5.ssl.TrustStrategy;

/**
 * This example demonstrates how to create secure connections with a custom SSL
 * context.
 */
public class AsyncClientCustomSSL {

    public final static void main(final String[] args) throws Exception {
        // Trust standard CA and those trusted by our custom strategy
        final SSLContext sslcontext = SSLContexts.custom()
                .loadTrustMaterial(new TrustStrategy() {

                    @Override
                    public boolean isTrusted(
                            final X509Certificate[] chain,
                            final String authType) throws CertificateException {
                        final X509Certificate cert = chain[0];
                        return "CN=httpbin.org".equalsIgnoreCase(cert.getSubjectDN().getName());
                    }

                })
                .build();
        final TlsStrategy tlsStrategy = new H2TlsStrategy(
                sslcontext,
                H2TlsStrategy.getDefaultHostnameVerifier()) {

            // IMPORTANT uncomment the following method when running Java 9 or older
            // in order to avoid the illegal reflective access operation warning
//            @Override
//            protected TlsDetails createTlsDetails(final SSLEngine sslEngine) {
//                return new TlsDetails(sslEngine.getSession(), sslEngine.getApplicationProtocol());
//            }

        };
        final PoolingAsyncClientConnectionManager cm = PoolingAsyncClientConnectionManagerBuilder.create()
                .setTlsStrategy(tlsStrategy)
                .build();
        try (CloseableHttpAsyncClient client = HttpAsyncClients.custom()
                .setConnectionManager(cm)
                .build()) {

            client.start();

            final HttpHost target = new HttpHost("httpbin.org", 443, "https");
            final String requestUri = "/";
            final HttpClientContext clientContext = HttpClientContext.create();

            final SimpleHttpRequest request = SimpleHttpRequest.get(target, requestUri);
            final Future<SimpleHttpResponse> future = client.execute(
                    SimpleRequestProducer.create(request),
                    SimpleResponseConsumer.create(),
                    clientContext,
                    new FutureCallback<SimpleHttpResponse>() {

                        @Override
                        public void completed(final SimpleHttpResponse response) {
                            System.out.println(requestUri + "->" + response.getCode());
                            System.out.println(response.getBody());
                            final SSLSession sslSession = clientContext.getSSLSession();
                            if (sslSession != null) {
                                System.out.println("SSL protocol " + sslSession.getProtocol());
                                System.out.println("SSL cipher suite " + sslSession.getCipherSuite());
                            }
                        }

                        @Override
                        public void failed(final Exception ex) {
                            System.out.println(requestUri + "->" + ex);
                        }

                        @Override
                        public void cancelled() {
                            System.out.println(requestUri + " cancelled");
                        }

                    });
            future.get();

            System.out.println("Shutting down");
            client.shutdown(ShutdownType.GRACEFUL);
        }
    }

}
