/*
    * ====================================================================
    * 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 java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  
  import javax.net.ssl.HostnameVerifier;
  import javax.net.ssl.SSLContext;
  import javax.net.ssl.SSLEngine;
  import javax.net.ssl.SSLParameters;
  
  import org.apache.hc.core5.annotation.Contract;
  import org.apache.hc.core5.annotation.ThreadingBehavior;
  import org.apache.hc.core5.http.nio.ssl.TlsStrategy;
  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.conscrypt.Conscrypt;
  
  /**
   * TLS upgrade strategy for non-blocking client connections using Conscrypt TLS library.
   *
   * @since 5.0
   */
  @Contract(threading = ThreadingBehavior.STATELESS)
  public class ConscryptClientTlsStrategy extends AbstractClientTlsStrategy {
  
      public static TlsStrategy getDefault() {
          return new ConscryptClientTlsStrategy(
                  SSLContexts.createDefault(),
                  HttpsSupport.getDefaultHostnameVerifier());
      }
  
      public static TlsStrategy getSystemDefault() {
          return new ConscryptClientTlsStrategy(
                  SSLContexts.createSystemDefault(),
                  HttpsSupport.getSystemProtocols(),
                  HttpsSupport.getSystemCipherSuits(),
                  SSLBufferMode.STATIC,
                  HttpsSupport.getDefaultHostnameVerifier());
      }
  
      public ConscryptClientTlsStrategy(
              final SSLContext sslContext,
              final String[] supportedProtocols,
              final String[] supportedCipherSuites,
              final SSLBufferMode sslBufferManagement,
              final HostnameVerifier hostnameVerifier) {
          super(sslContext, supportedProtocols, supportedCipherSuites, sslBufferManagement, hostnameVerifier);
      }
  
      public ConscryptClientTlsStrategy(
              final SSLContext sslcontext,
              final HostnameVerifier hostnameVerifier) {
          this(sslcontext, null, null, SSLBufferMode.STATIC, hostnameVerifier);
      }
  
      public ConscryptClientTlsStrategy(final SSLContext sslcontext) {
          this(sslcontext, HttpsSupport.getDefaultHostnameVerifier());
      }
  
      @Override
      void applyParameters(final SSLEngine sslEngine, final SSLParameters sslParameters, final String[] appProtocols) {
          if (Conscrypt.isConscrypt(sslEngine)) {
              sslEngine.setSSLParameters(sslParameters);
              Conscrypt.setApplicationProtocols(sslEngine, appProtocols);
          } else {
              sslParameters.setApplicationProtocols(appProtocols);
              sslEngine.setSSLParameters(sslParameters);
          }
      }
  
      @Override
     TlsDetails createTlsDetails(final SSLEngine sslEngine) {
         if (Conscrypt.isConscrypt(sslEngine)) {
             return new TlsDetails(sslEngine.getSession(), Conscrypt.getApplicationProtocol(sslEngine));
         }
         return null;
     }
 
     public static boolean isSupported() {
         try {
             final Class<?> clazz = Class.forName("org.conscrypt.Conscrypt");
             final Method method = clazz.getMethod("isAvailable");
             return ((Boolean) method.invoke(null)).booleanValue();
         } catch (final ClassNotFoundException | NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
             return false;
         }
     }
 
 }