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   /*
    * Copyright 2017 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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.
   */
  package io.netty.handler.ssl;
  
  import io.netty.util.internal.PlatformDependent;
  
  import javax.net.ssl.SSLEngine;
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  
  /**
   * Contains methods that can be used to detect if conscrypt is usable.
   */
  final class Conscrypt {
      // This class exists to avoid loading other conscrypt related classes using features only available in JDK8+,
      // because we need to maintain JDK6+ runtime compatibility.
      private static final Method IS_CONSCRYPT_SSLENGINE;
  
      static {
          Method isConscryptSSLEngine = null;
  
          if ((PlatformDependent.javaVersion() >= 8 &&
                  // Only works on Java14 and earlier for now
                  // See https://github.com/google/conscrypt/issues/838
                  PlatformDependent.javaVersion() < 15) || PlatformDependent.isAndroid()) {
              try {
                  Class<?> providerClass = Class.forName("org.conscrypt.OpenSSLProvider", true,
                          PlatformDependent.getClassLoader(ConscryptAlpnSslEngine.class));
                  providerClass.newInstance();
  
                  Class<?> conscryptClass = Class.forName("org.conscrypt.Conscrypt", true,
                          PlatformDependent.getClassLoader(ConscryptAlpnSslEngine.class));
                  isConscryptSSLEngine = conscryptClass.getMethod("isConscrypt", SSLEngine.class);
              } catch (Throwable ignore) {
                  // ignore
              }
          }
          IS_CONSCRYPT_SSLENGINE = isConscryptSSLEngine;
      }
  
      /**
       * Indicates whether or not conscrypt is available on the current system.
       */
      static boolean isAvailable() {
          return IS_CONSCRYPT_SSLENGINE != null;
      }
  
      /**
       * Returns {@code true} if the passed in {@link SSLEngine} is handled by Conscrypt, {@code false} otherwise.
       */
      static boolean isEngineSupported(SSLEngine engine) {
          try {
              return IS_CONSCRYPT_SSLENGINE != null && (Boolean) IS_CONSCRYPT_SSLENGINE.invoke(null, engine);
          } catch (IllegalAccessException ignore) {
              return false;
          } catch (InvocationTargetException ex) {
              throw new RuntimeException(ex);
          }
      }
  
      private Conscrypt() { }
  }