/*
    * ====================================================================
    * 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.http.nio.ssl;
  
  import java.net.SocketAddress;
  
  import javax.net.ssl.SSLContext;
  
  import org.apache.hc.core5.http.HttpHost;
  import org.apache.hc.core5.http.URIScheme;
  import org.apache.hc.core5.reactor.ssl.SSLBufferMode;
  import org.apache.hc.core5.reactor.ssl.SSLSessionInitializer;
  import org.apache.hc.core5.reactor.ssl.SSLSessionVerifier;
  import org.apache.hc.core5.reactor.ssl.TransportSecurityLayer;
  import org.apache.hc.core5.ssl.SSLContexts;
  import org.apache.hc.core5.util.Args;
  import org.apache.hc.core5.util.Timeout;
  
  /**
   * Basic client-side implementation of {@link TlsStrategy} that upgrades to TLS for all endpoints
   * with {@code HTTPS} scheme.
   *
   * @since 5.0
   */
  public class BasicClientTlsStrategy implements TlsStrategy {
  
      private final SSLContext sslContext;
      private final SSLBufferMode sslBufferMode;
      private final SSLSessionInitializer initializer;
      private final SSLSessionVerifier verifier;
  
      public BasicClientTlsStrategy(
              final SSLContext sslContext,
              final SSLBufferMode sslBufferMode,
              final SSLSessionInitializer initializer,
              final SSLSessionVerifier verifier) {
          this.sslContext = Args.notNull(sslContext, "SSL context");
          this.sslBufferMode = sslBufferMode;
          this.initializer = initializer;
          this.verifier = verifier;
      }
  
      public BasicClientTlsStrategy(
              final SSLContext sslContext,
              final SSLSessionInitializer initializer,
              final SSLSessionVerifier verifier) {
          this(sslContext, null, initializer, verifier);
      }
  
      public BasicClientTlsStrategy(
              final SSLContext sslContext,
              final SSLSessionVerifier verifier) {
          this(sslContext, null, null, verifier);
      }
  
      public BasicClientTlsStrategy(final SSLContext sslContext) {
          this(sslContext, null, null, null);
      }
  
      public BasicClientTlsStrategy() {
          this(SSLContexts.createSystemDefault());
      }
  
      @Override
      public boolean upgrade(
              final TransportSecurityLayer tlsSession,
              final HttpHost host,
              final SocketAddress localAddress,
              final SocketAddress remoteAddress,
              final Object attachment,
              final Timeout handshakeTimeout) {
          final String scheme = host != null ? host.getSchemeName() : null;
          if (URIScheme.HTTPS.same(scheme)) {
              tlsSession.startTls(sslContext, host, sslBufferMode,
                     TlsSupport.enforceStrongSecurity(initializer), verifier, handshakeTimeout);
             return true;
         }
         return false;
     }
 
 }