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   /*
    * Copyright 2014 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:
    *
    *   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.
   */
  
  package org.jboss.netty.handler.ssl;
  
  import org.eclipse.jetty.npn.NextProtoNego;
  import org.eclipse.jetty.npn.NextProtoNego.ClientProvider;
  import org.eclipse.jetty.npn.NextProtoNego.ServerProvider;
  
  import javax.net.ssl.SSLEngine;
  import javax.net.ssl.SSLEngineResult;
  import javax.net.ssl.SSLEngineResult.HandshakeStatus;
  import javax.net.ssl.SSLException;
  import javax.net.ssl.SSLParameters;
  import javax.net.ssl.SSLSession;
  import java.nio.ByteBuffer;
  import java.util.List;
  
  final class JettyNpnSslEngine extends SSLEngine {
  
      private static boolean available;
  
      static boolean isAvailable() {
          updateAvailability();
          return available;
      }
  
      private static void updateAvailability() {
          if (available) {
              return;
          }
          try {
              // Try to get the bootstrap class loader.
              ClassLoader bootloader = ClassLoader.getSystemClassLoader().getParent();
              if (bootloader == null) {
                  // If failed, use the system class loader,
                  // although it's not perfect to tell if NPN extension has been loaded.
                  bootloader = ClassLoader.getSystemClassLoader();
              }
              Class.forName("sun.security.ssl.NextProtoNegoExtension", true, bootloader);
              available = true;
          } catch (Exception ignore) {
              // npn-boot was not loaded.
          }
      }
  
      private final SSLEngine engine;
      private final JettyNpnSslSession session;
  
      JettyNpnSslEngine(SSLEngine engine, final List<String> nextProtocols, boolean server) {
          assert !nextProtocols.isEmpty();
  
          this.engine = engine;
          session = new JettyNpnSslSession(engine);
  
          if (server) {
              NextProtoNego.put(engine, new ServerProvider() {
                  public void unsupported() {
                      getSession().setApplicationProtocol(nextProtocols.get(nextProtocols.size() - 1));
                  }
  
                  public List<String> protocols() {
                      return nextProtocols;
                  }
  
                  public void protocolSelected(String protocol) {
                      getSession().setApplicationProtocol(protocol);
                  }
              });
          } else {
              final String[] list = nextProtocols.toArray(new String[nextProtocols.size()]);
              final String fallback = list[list.length - 1];
  
              NextProtoNego.put(engine, new ClientProvider() {
                  public boolean supports() {
                      return true;
                  }
  
                  public void unsupported() {
                      session.setApplicationProtocol(null);
                  }
  
                  public String selectProtocol(List<String> protocols) {
                      for (String p: list) {
                          if (protocols.contains(p)) {
                              return p;
                         }
                     }
                     return fallback;
                 }
             });
         }
     }
 
     @Override
     public JettyNpnSslSession getSession() {
         return session;
     }
 
     @Override
     public void closeInbound() throws SSLException {
         NextProtoNego.remove(engine);
         engine.closeInbound();
     }
 
     @Override
     public void closeOutbound() {
         NextProtoNego.remove(engine);
         engine.closeOutbound();
     }
 
     @Override
     public String getPeerHost() {
         return engine.getPeerHost();
     }
 
     @Override
     public int getPeerPort() {
         return engine.getPeerPort();
     }
 
     @Override
     public SSLEngineResult wrap(ByteBuffer byteBuffer, ByteBuffer byteBuffer2) throws SSLException {
         return engine.wrap(byteBuffer, byteBuffer2);
     }
 
     @Override
     public SSLEngineResult wrap(ByteBuffer[] byteBuffers, ByteBuffer byteBuffer) throws SSLException {
         return engine.wrap(byteBuffers, byteBuffer);
     }
 
     @Override
     public SSLEngineResult wrap(ByteBuffer[] byteBuffers, int i, int i2, ByteBuffer byteBuffer) throws SSLException {
         return engine.wrap(byteBuffers, i, i2, byteBuffer);
     }
 
     @Override
     public SSLEngineResult unwrap(ByteBuffer byteBuffer, ByteBuffer byteBuffer2) throws SSLException {
         return engine.unwrap(byteBuffer, byteBuffer2);
     }
 
     @Override
     public SSLEngineResult unwrap(ByteBuffer byteBuffer, ByteBuffer[] byteBuffers) throws SSLException {
         return engine.unwrap(byteBuffer, byteBuffers);
     }
 
     @Override
     public SSLEngineResult unwrap(ByteBuffer byteBuffer, ByteBuffer[] byteBuffers, int i, int i2) throws SSLException {
         return engine.unwrap(byteBuffer, byteBuffers, i, i2);
     }
 
     @Override
     public Runnable getDelegatedTask() {
         return engine.getDelegatedTask();
     }
 
     @Override
     public boolean isInboundDone() {
         return engine.isInboundDone();
     }
 
     @Override
     public boolean isOutboundDone() {
         return engine.isOutboundDone();
     }
 
     @Override
     public String[] getSupportedCipherSuites() {
         return engine.getSupportedCipherSuites();
     }
 
     @Override
     public String[] getEnabledCipherSuites() {
         return engine.getEnabledCipherSuites();
     }
 
     @Override
     public void setEnabledCipherSuites(String[] strings) {
         engine.setEnabledCipherSuites(strings);
     }
 
     @Override
     public String[] getSupportedProtocols() {
         return engine.getSupportedProtocols();
     }
 
     @Override
     public String[] getEnabledProtocols() {
         return engine.getEnabledProtocols();
     }
 
     @Override
     public void setEnabledProtocols(String[] strings) {
         engine.setEnabledProtocols(strings);
     }
 
     @Override
     public SSLSession getHandshakeSession() {
         return engine.getHandshakeSession();
     }
 
     @Override
     public void beginHandshake() throws SSLException {
         engine.beginHandshake();
     }
 
     @Override
     public HandshakeStatus getHandshakeStatus() {
         return engine.getHandshakeStatus();
     }
 
     @Override
     public void setUseClientMode(boolean b) {
         engine.setUseClientMode(b);
     }
 
     @Override
     public boolean getUseClientMode() {
         return engine.getUseClientMode();
     }
 
     @Override
     public void setNeedClientAuth(boolean b) {
         engine.setNeedClientAuth(b);
     }
 
     @Override
     public boolean getNeedClientAuth() {
         return engine.getNeedClientAuth();
     }
 
     @Override
     public void setWantClientAuth(boolean b) {
         engine.setWantClientAuth(b);
     }
 
     @Override
     public boolean getWantClientAuth() {
         return engine.getWantClientAuth();
     }
 
     @Override
     public void setEnableSessionCreation(boolean b) {
         engine.setEnableSessionCreation(b);
     }
 
     @Override
     public boolean getEnableSessionCreation() {
         return engine.getEnableSessionCreation();
     }
 
     @Override
     public SSLParameters getSSLParameters() {
         return engine.getSSLParameters();
     }
 
     @Override
     public void setSSLParameters(SSLParameters sslParameters) {
         engine.setSSLParameters(sslParameters);
     }
 }