/*
    * ====================================================================
    * 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.ssl;
  
  import javax.net.ssl.HostnameVerifier;
  import javax.net.ssl.SSLContext;
  import javax.net.ssl.SSLEngine;
  import javax.net.ssl.SSLSession;
  
  import org.apache.hc.core5.function.Factory;
  import org.apache.hc.core5.http.nio.ssl.TlsStrategy;
  import org.apache.hc.core5.http.ssl.TLS;
  import org.apache.hc.core5.reactor.ssl.SSLBufferMode;
  import org.apache.hc.core5.reactor.ssl.TlsDetails;
  import org.apache.hc.core5.ssl.SSLContexts;
  import org.apache.hc.core5.util.ReflectionUtils;
  
  /**
   * Builder for client {@link TlsStrategy} instances.
   * <p>
   * When a particular component is not explicitly set this class will
   * use its default implementation. System properties will be taken
   * into account when configuring the default implementations when
   * {@link #useSystemProperties()} method is called prior to calling
   * {@link #build()}.
   * </p>
   * <ul>
   *  <li>ssl.TrustManagerFactory.algorithm</li>
   *  <li>javax.net.ssl.trustStoreType</li>
   *  <li>javax.net.ssl.trustStore</li>
   *  <li>javax.net.ssl.trustStoreProvider</li>
   *  <li>javax.net.ssl.trustStorePassword</li>
   *  <li>ssl.KeyManagerFactory.algorithm</li>
   *  <li>javax.net.ssl.keyStoreType</li>
   *  <li>javax.net.ssl.keyStore</li>
   *  <li>javax.net.ssl.keyStoreProvider</li>
   *  <li>javax.net.ssl.keyStorePassword</li>
   *  <li>https.protocols</li>
   *  <li>https.cipherSuites</li>
   * </ul>
   *
   * @since 5.0
   */
  public class ClientTlsStrategyBuilder {
  
      public static ClientTlsStrategyBuilder create() {
          return new ClientTlsStrategyBuilder();
      }
  
      private SSLContext sslContext;
      private String[] tlsVersions;
      private String[] ciphers;
      private SSLBufferMode sslBufferMode;
      private HostnameVerifier hostnameVerifier;
      private Factory<SSLEngine, TlsDetails> tlsDetailsFactory;
      private boolean systemProperties;
  
      /**
       * Assigns {@link SSLContext} instance.
       */
      public ClientTlsStrategyBuilder setSslContext(final SSLContext sslContext) {
          this.sslContext = sslContext;
          return this;
      }
  
      /**
       * Assigns enabled {@code TLS} versions.
       */
      public final ClientTlsStrategyBuilder setTlsVersions(final String... tlslVersions) {
          this.tlsVersions = tlslVersions;
          return this;
      }
  
      /**
      * Assigns enabled {@code TLS} versions.
      */
     public final ClientTlsStrategyBuilder setTlsVersions(final TLS... tlslVersions) {
         this.tlsVersions = new String[tlslVersions.length];
         for (int i = 0; i < tlslVersions.length; i++) {
             this.tlsVersions[i] = tlslVersions[i].id;
         }
         return this;
     }
 
     /**
      * Assigns enabled ciphers.
      */
     public final ClientTlsStrategyBuilder setCiphers(final String... ciphers) {
         this.ciphers = ciphers;
         return this;
     }
 
     /**
      * Assigns {@link SSLBufferMode} value.
      */
     public ClientTlsStrategyBuilder setSslBufferMode(final SSLBufferMode sslBufferMode) {
         this.sslBufferMode = sslBufferMode;
         return this;
     }
 
     /**
      * Assigns {@link HostnameVerifier} instance.
      */
     public ClientTlsStrategyBuilder setHostnameVerifier(final HostnameVerifier hostnameVerifier) {
         this.hostnameVerifier = hostnameVerifier;
         return this;
     }
 
     /**
      * Assigns {@link TlsDetails} {@link Factory} instance.
      */
     public ClientTlsStrategyBuilder setTlsDetailsFactory(final Factory<SSLEngine, TlsDetails> tlsDetailsFactory) {
         this.tlsDetailsFactory = tlsDetailsFactory;
         return this;
     }
 
     /**
      * Use system properties when creating and configuring default
      * implementations.
      */
     public final ClientTlsStrategyBuilder useSystemProperties() {
         this.systemProperties = true;
         return this;
     }
 
     public TlsStrategy build() {
         final SSLContext sslContextCopy;
         if (sslContext != null) {
             sslContextCopy = sslContext;
         } else {
             sslContextCopy = systemProperties ? SSLContexts.createSystemDefault() : SSLContexts.createDefault();
         }
         final String[] tlsVersionsCopy;
         if (tlsVersions != null) {
             tlsVersionsCopy = tlsVersions;
         } else {
             tlsVersionsCopy = systemProperties ? HttpsSupport.getSystemProtocols() : null;
         }
         final String[] ciphersCopy;
         if (ciphers != null) {
             ciphersCopy = ciphers;
         } else {
             ciphersCopy = systemProperties ? HttpsSupport.getSystemCipherSuits() : null;
         }
         final Factory<SSLEngine, TlsDetails> tlsDetailsFactoryCopy;
         if (tlsDetailsFactory != null) {
             tlsDetailsFactoryCopy = tlsDetailsFactory;
         } else {
             tlsDetailsFactoryCopy = new Factory<SSLEngine, TlsDetails>() {
                 @Override
                 public TlsDetails create(final SSLEngine sslEngine) {
                     final SSLSession sslSession = sslEngine.getSession();
                     final String applicationProtocol = ReflectionUtils.callGetter(sslEngine,
                         "ApplicationProtocol", String.class);
                     return new TlsDetails(sslSession, applicationProtocol);
                 }
             };
         }
         return new DefaultClientTlsStrategy(
                 sslContextCopy,
                 tlsVersionsCopy,
                 ciphersCopy,
                 sslBufferMode != null ? sslBufferMode : SSLBufferMode.STATIC,
                 hostnameVerifier != null ? hostnameVerifier : HttpsSupport.getDefaultHostnameVerifier(),
                 tlsDetailsFactoryCopy);
     }
 
 }