/*
    * ====================================================================
    * 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.net.InetAddress;
  import java.net.UnknownHostException;
  import java.nio.charset.CodingErrorAction;
  import java.nio.charset.StandardCharsets;
  import java.util.Arrays;
  import java.util.Collections;
  
  import javax.net.ssl.SSLContext;
  
  import org.apache.hc.client5.http.ContextBuilder;
  import org.apache.hc.client5.http.DnsResolver;
  import org.apache.hc.client5.http.HttpRoute;
  import org.apache.hc.client5.http.SystemDefaultDnsResolver;
  import org.apache.hc.client5.http.auth.CredentialsProvider;
  import org.apache.hc.client5.http.auth.StandardAuthScheme;
  import org.apache.hc.client5.http.classic.methods.HttpGet;
  import org.apache.hc.client5.http.config.ConnectionConfig;
  import org.apache.hc.client5.http.config.RequestConfig;
  import org.apache.hc.client5.http.config.TlsConfig;
  import org.apache.hc.client5.http.cookie.BasicCookieStore;
  import org.apache.hc.client5.http.cookie.CookieStore;
  import org.apache.hc.client5.http.cookie.StandardCookieSpec;
  import org.apache.hc.client5.http.impl.auth.CredentialsProviderBuilder;
  import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
  import org.apache.hc.client5.http.impl.classic.HttpClients;
  import org.apache.hc.client5.http.impl.io.ManagedHttpClientConnectionFactory;
  import org.apache.hc.client5.http.impl.io.PoolingHttpClientConnectionManager;
  import org.apache.hc.client5.http.impl.io.PoolingHttpClientConnectionManagerBuilder;
  import org.apache.hc.client5.http.io.ManagedHttpClientConnection;
  import org.apache.hc.client5.http.protocol.HttpClientContext;
  import org.apache.hc.client5.http.ssl.DefaultClientTlsStrategy;
  import org.apache.hc.client5.http.ssl.TlsSocketStrategy;
  import org.apache.hc.core5.http.ClassicHttpRequest;
  import org.apache.hc.core5.http.ClassicHttpResponse;
  import org.apache.hc.core5.http.Header;
  import org.apache.hc.core5.http.HttpHost;
  import org.apache.hc.core5.http.ParseException;
  import org.apache.hc.core5.http.config.CharCodingConfig;
  import org.apache.hc.core5.http.config.Http1Config;
  import org.apache.hc.core5.http.impl.io.DefaultClassicHttpResponseFactory;
  import org.apache.hc.core5.http.impl.io.DefaultHttpRequestWriterFactory;
  import org.apache.hc.core5.http.impl.io.DefaultHttpResponseParser;
  import org.apache.hc.core5.http.impl.io.DefaultHttpResponseParserFactory;
  import org.apache.hc.core5.http.io.HttpConnectionFactory;
  import org.apache.hc.core5.http.io.HttpMessageParser;
  import org.apache.hc.core5.http.io.HttpMessageParserFactory;
  import org.apache.hc.core5.http.io.HttpMessageWriterFactory;
  import org.apache.hc.core5.http.io.SocketConfig;
  import org.apache.hc.core5.http.io.entity.EntityUtils;
  import org.apache.hc.core5.http.message.BasicHeader;
  import org.apache.hc.core5.http.message.BasicLineParser;
  import org.apache.hc.core5.http.message.LineParser;
  import org.apache.hc.core5.http.message.StatusLine;
  import org.apache.hc.core5.http.ssl.TLS;
  import org.apache.hc.core5.pool.PoolConcurrencyPolicy;
  import org.apache.hc.core5.pool.PoolReusePolicy;
  import org.apache.hc.core5.ssl.SSLContexts;
  import org.apache.hc.core5.util.CharArrayBuffer;
  import org.apache.hc.core5.util.TimeValue;
  import org.apache.hc.core5.util.Timeout;
  
  /**
   * This example demonstrates how to customize and configure the most common aspects
   * of HTTP request execution and connection management.
   */
  public class ClientConfiguration {
  
      public final static void main(final String[] args) throws Exception {
  
          // Create HTTP/1.1 protocol configuration
         final Http1Config h1Config = Http1Config.custom()
                 .setMaxHeaderCount(200)
                 .setMaxLineLength(2000)
                 .build();
 
         // Use custom message parser / writer to customize the way HTTP
         // messages are parsed from and written out to the data stream.
         final HttpMessageParserFactory<ClassicHttpResponse> responseParserFactory = new DefaultHttpResponseParserFactory() {
 
             @Override
             public HttpMessageParser<ClassicHttpResponse> create() {
                 final LineParser lineParser = new BasicLineParser() {
 
                     @Override
                     public Header parseHeader(final CharArrayBuffer buffer) {
                         try {
                             return super.parseHeader(buffer);
                         } catch (final ParseException ex) {
                             return new BasicHeader(buffer.toString(), null);
                         }
                     }
 
                 };
                 return new DefaultHttpResponseParser(h1Config, lineParser, DefaultClassicHttpResponseFactory.INSTANCE);
             }
 
         };
         final HttpMessageWriterFactory<ClassicHttpRequest> requestWriterFactory = new DefaultHttpRequestWriterFactory();
 
         // Create char coding configuration
         final CharCodingConfig charCodingConfig = CharCodingConfig.custom()
                 .setMalformedInputAction(CodingErrorAction.IGNORE)
                 .setUnmappableInputAction(CodingErrorAction.IGNORE)
                 .setCharset(StandardCharsets.UTF_8)
                 .build();
 
         // Use a custom connection factory to customize the process of
         // initialization of outgoing HTTP connections. Beside standard connection
         // configuration parameters HTTP connection factory can define message
         // parser / writer routines to be employed by individual connections.
         final HttpConnectionFactory<ManagedHttpClientConnection> connFactory = new ManagedHttpClientConnectionFactory(
                 h1Config, charCodingConfig, requestWriterFactory, responseParserFactory);
 
         // Client HTTP connection objects when fully initialized can be bound to
         // an arbitrary network socket. The process of network socket initialization,
         // its connection to a remote address and binding to a local one is controlled
         // by a connection socket factory.
 
         // SSL context for secure connections can be created either based on
         // system or application specific properties.
         final SSLContext sslContext = SSLContexts.createSystemDefault();
 
         // Create a registry of custom connection socket factories for supported
         // protocol schemes.
         final TlsSocketStrategy tlsStrategy = new DefaultClientTlsStrategy(sslContext);
 
         // Use custom DNS resolver to override the system DNS resolution.
         final DnsResolver dnsResolver = new SystemDefaultDnsResolver() {
 
             @Override
             public InetAddress[] resolve(final String host) throws UnknownHostException {
                 if (host.equalsIgnoreCase("myhost")) {
                     return new InetAddress[] { InetAddress.getByAddress(new byte[] {127, 0, 0, 1}) };
                 }
                 return super.resolve(host);
             }
 
         };
 
         // Create a connection manager with custom configuration.
         final PoolingHttpClientConnectionManager connManager = PoolingHttpClientConnectionManagerBuilder.create()
                 .setTlsSocketStrategy(tlsStrategy)
                 .setConnectionFactory(connFactory)
                 .setDnsResolver(dnsResolver)
                 .setPoolConcurrencyPolicy(PoolConcurrencyPolicy.STRICT)
                 .setConnPoolPolicy(PoolReusePolicy.LIFO)
                 .build();
 
         // Configure the connection manager to use socket configuration either
         // by default or for a specific host.
         connManager.setDefaultSocketConfig(SocketConfig.custom()
                 .setTcpNoDelay(true)
                 .build());
         // Validate connections after 10 sec of inactivity
         connManager.setDefaultConnectionConfig(ConnectionConfig.custom()
                 .setConnectTimeout(Timeout.ofSeconds(30))
                 .setSocketTimeout(Timeout.ofSeconds(30))
                 .setValidateAfterInactivity(TimeValue.ofSeconds(10))
                 .setTimeToLive(TimeValue.ofHours(1))
                 .build());
 
         // Use TLS v1.3 only
         connManager.setDefaultTlsConfig(TlsConfig.custom()
                 .setHandshakeTimeout(Timeout.ofSeconds(30))
                 .setSupportedProtocols(TLS.V_1_3)
                 .build());
 
         // Configure total max or per route limits for persistent connections
         // that can be kept in the pool or leased by the connection manager.
         connManager.setMaxTotal(100);
         connManager.setDefaultMaxPerRoute(10);
         connManager.setMaxPerRoute(new HttpRoute(new HttpHost("somehost", 80)), 20);
 
         // Use custom cookie store if necessary.
         final CookieStore cookieStore = new BasicCookieStore();
         // Use custom credentials provider if necessary.
         final CredentialsProvider credentialsProvider = CredentialsProviderBuilder.create()
                 .build();
         // Create global request configuration
         final RequestConfig defaultRequestConfig = RequestConfig.custom()
             .setCookieSpec(StandardCookieSpec.STRICT)
             .setExpectContinueEnabled(true)
             .setTargetPreferredAuthSchemes(Arrays.asList(StandardAuthScheme.DIGEST))
             .setProxyPreferredAuthSchemes(Collections.singletonList(StandardAuthScheme.BASIC))
             .build();
 
         // Create an HttpClient with the given custom dependencies and configuration.
 
         try (final CloseableHttpClient httpclient = HttpClients.custom()
                 .setConnectionManager(connManager)
                 .setDefaultCookieStore(cookieStore)
                 .setDefaultCredentialsProvider(credentialsProvider)
                 .setProxy(new HttpHost("myproxy", 8080))
                 .setDefaultRequestConfig(defaultRequestConfig)
                 .build()) {
             final HttpGet httpget = new HttpGet("http://httpbin.org/get");
             // Request configuration can be overridden at the request level.
             // They will take precedence over the one set at the client level.
             final RequestConfig requestConfig = RequestConfig.copy(defaultRequestConfig)
                     .setConnectionRequestTimeout(Timeout.ofSeconds(5))
                     .build();
             httpget.setConfig(requestConfig);
 
             // Execution context can be customized locally.
             // Contextual attributes set the local context level will take
             // precedence over those set at the client level.
             final HttpClientContext context = ContextBuilder.create()
                     .useCookieStore(cookieStore)
                     .useCredentialsProvider(credentialsProvider)
                     .build();
 
             System.out.println("Executing request " + httpget.getMethod() + " " + httpget.getUri());
             httpclient.execute(httpget, context, response -> {
                 System.out.println("----------------------------------------");
                 System.out.println(httpget + "->" + new StatusLine(response));
                 EntityUtils.consume(response.getEntity());
                 return null;
             });
             // Last executed request
             context.getRequest();
             // Execution route
             context.getHttpRoute();
             // Auth exchanges
             context.getAuthExchanges();
             // Cookie origin
             context.getCookieOrigin();
             // Cookie spec used
             context.getCookieSpec();
             // User security token
             context.getUserToken();
         }
     }
 
 }