/*
    * ====================================================================
    * 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.core5.http2.ssl;
  
  import javax.net.ssl.SSLParameters;
  
  import org.apache.hc.core5.http.ssl.TLS;
  import org.apache.hc.core5.http.ssl.TlsCiphers;
  import org.apache.hc.core5.reactor.ssl.SSLSessionInitializer;
  import org.apache.hc.core5.reactor.ssl.SSLSessionVerifier;
  import org.apache.hc.core5.reactor.ssl.TlsDetails;
  import org.conscrypt.Conscrypt;
  
  /**
   * Conscrypt TLS support methods
   *
   * @since 5.0
   */
  public final class ConscryptSupport {
  
      public static SSLSessionInitializer initialize(
              final Object attachment,
              final SSLSessionInitializer initializer) {
          return (endpoint, sslEngine) -> {
              final SSLParameters sslParameters = sslEngine.getSSLParameters();
              sslParameters.setProtocols(TLS.excludeWeak(sslParameters.getProtocols()));
              sslParameters.setCipherSuites(TlsCiphers.excludeH2Blacklisted(sslParameters.getCipherSuites()));
              H2TlsSupport.setEnableRetransmissions(sslParameters, false);
              final String[] appProtocols = H2TlsSupport.selectApplicationProtocols(attachment);
              if (Conscrypt.isConscrypt(sslEngine)) {
                  sslEngine.setSSLParameters(sslParameters);
                  Conscrypt.setApplicationProtocols(sslEngine, appProtocols);
              } else {
                  sslParameters.setApplicationProtocols(appProtocols);
                  sslEngine.setSSLParameters(sslParameters);
              }
              if (initializer != null) {
                  initializer.initialize(endpoint, sslEngine);
              }
          };
      }
  
      public static SSLSessionVerifier verify(final SSLSessionVerifier verifier) {
          return (endpoint, sslEngine) -> {
              TlsDetails tlsDetails = verifier != null ? verifier.verify(endpoint, sslEngine) : null;
              if (tlsDetails == null && Conscrypt.isConscrypt(sslEngine)) {
                  tlsDetails = new TlsDetails(sslEngine.getSession(), Conscrypt.getApplicationProtocol(sslEngine));
              }
              return tlsDetails;
          };
      }
  
  }