/*
    *  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.
   *
   */
  
  package org.apache.mina.core.service;
  
  import static org.junit.Assert.fail;
  
  import org.apache.mina.core.filterchain.DefaultIoFilterChainBuilder;
  import org.apache.mina.core.future.ConnectFuture;
  import org.apache.mina.core.service.AbstractIoService;
  import org.apache.mina.core.service.IoHandlerAdapter;
  import org.apache.mina.core.session.IoSession;
  import org.apache.mina.filter.codec.ProtocolCodecFilter;
  import org.apache.mina.filter.codec.textline.TextLineCodecFactory;
  import org.apache.mina.filter.ssl.SslFilter;
  import org.apache.mina.transport.socket.nio.NioSocketAcceptor;
  import org.apache.mina.transport.socket.nio.NioSocketConnector;
  import org.apache.mina.util.AvailablePortFinder;
  import org.junit.Ignore;
  import org.junit.Test;
  
  import javax.net.ssl.KeyManagerFactory;
  import javax.net.ssl.SSLContext;
  import javax.net.ssl.TrustManagerFactory;
  
  import java.io.IOException;
  import java.net.InetAddress;
  import java.net.InetSocketAddress;
  import java.net.SocketAddress;
  import java.security.GeneralSecurityException;
  import java.security.KeyStore;
  import java.security.Security;
  import java.util.concurrent.CountDownLatch;
  
  /**
   * Test a SSL session and provoke HandshakeException.
   * This test should not hang or timeout when DIRMINA-1076/1077 is fixed.
   * 
   * @author chrjohn
   */
  public class SslTestHandshakeExceptionDIRMINA1077Test {
      private int port = AvailablePortFinder.getNextAvailable();
      private static InetAddress address;
      private static NioSocketAcceptor acceptor;
  
      /** A JVM independant KEY_MANAGER_FACTORY algorithm */
      private static final String KEY_MANAGER_FACTORY_ALGORITHM;
  
      static {
          String algorithm = Security.getProperty("ssl.KeyManagerFactory.algorithm");
          if (algorithm == null) {
              algorithm = KeyManagerFactory.getDefaultAlgorithm();
          }
  
          KEY_MANAGER_FACTORY_ALGORITHM = algorithm;
      }
  
  
      private static class TestHandler extends IoHandlerAdapter {
          public void messageReceived(IoSession session, Object message) throws Exception {}
  
          @Override
          public void exceptionCaught( IoSession session, Throwable cause )
              throws Exception {}
      }
  
      /**
       * Starts a Server with the SSL Filter and a simple text line 
       * protocol codec filter
       */
      private void startServer(int port) throws Exception {
          acceptor = new NioSocketAcceptor();
  
          acceptor.setReuseAddress(true);
          DefaultIoFilterChainBuilder filters = acceptor.getFilterChain();
  
          // Inject the SSL filter
          SslFilter sslFilter = new SslFilter(createSSLContext(true));
          filters.addLast("sslFilter", sslFilter);
          sslFilter.setNeedClientAuth(true);
  
          // Inject the TestLine codec filter
         filters.addLast("text", new ProtocolCodecFilter(new TextLineCodecFactory()));
 
         acceptor.setHandler(new TestHandler());
         acceptor.bind(new InetSocketAddress(port));
     }
     
     private static void stopServer() {
         acceptor.dispose(true);
     }
 
     private void startAndStopClient( int port, CountDownLatch disposalLatch ) throws Exception {
         NioSocketConnector nioSocketConnector = new NioSocketConnector();
         nioSocketConnector.setHandler(new TestHandler());
         DefaultIoFilterChainBuilder filters = nioSocketConnector.getFilterChain();
 
         // Inject the SSL filter
         SslFilter sslFilter = new SslFilter(createSSLContext(false));
         sslFilter.setUseClientMode( true );
         filters.addLast("sslFilter", sslFilter);
 
         address = InetAddress.getByName("localhost");
         SocketAddress remoteAddress = new InetSocketAddress( address, port );
         ConnectFuture connect = nioSocketConnector.connect( remoteAddress );
         connect.awaitUninterruptibly();
 //        System.out.println( "Closing connection..." );
         nioSocketConnector.dispose( true );
         disposalLatch.countDown();
 //        System.out.println( "Connection closed!" );
     }
 
     private static SSLContext createSSLContext(boolean emptyKeystore) throws IOException, GeneralSecurityException {
         char[] passphrase = "password".toCharArray();
 
         SSLContext ctx = SSLContext.getInstance("TLSv1.2");
         KeyManagerFactory kmf = KeyManagerFactory.getInstance(KEY_MANAGER_FACTORY_ALGORITHM);
         TrustManagerFactory tmf = TrustManagerFactory.getInstance(KEY_MANAGER_FACTORY_ALGORITHM);
 
         KeyStore ks = KeyStore.getInstance("JKS");
         KeyStore ts = KeyStore.getInstance("JKS");
 
         // use empty keystore to provoke handshake exception
         if (emptyKeystore) {
             ks.load(SslTestHandshakeExceptionDIRMINA1077Test.class.getResourceAsStream("emptykeystore.sslTest"), passphrase);
         } else {
             ks.load(SslTestHandshakeExceptionDIRMINA1077Test.class.getResourceAsStream("keystore.sslTest"), passphrase);
         }
         ts.load(SslTestHandshakeExceptionDIRMINA1077Test.class.getResourceAsStream("truststore.sslTest"), passphrase);
 
         kmf.init(ks, passphrase);
         tmf.init(ts);
 
         ctx.init(kmf.getKeyManagers(), tmf.getTrustManagers(), null);
 
         return ctx;
     }
 
     @Test(timeout=15000)
     @Ignore
     public void testSSL() throws Exception {
         long startTime = System.currentTimeMillis();
         // without DIRMINA-1076/1077 fixed, the test will hang after short time
         while (System.currentTimeMillis() < startTime + 10000) {
             try {
                 port = AvailablePortFinder.getNextAvailable();
                 final CountDownLatch disposalLatch = new CountDownLatch( 1 );
                 startServer(port);
                 
                 Thread t = new Thread() {
                     public void run() {
                         try {
                             startAndStopClient(port, disposalLatch);
                         } catch ( Exception e ) {}
                     }
                 };
                 t.setDaemon( true );
                 t.start();
                 disposalLatch.await();
                 t.join( 1000 );
 
                 if ( t.isAlive() ) {
                     for ( StackTraceElement stackTraceElement : t.getStackTrace() ) {
                         if ( "dispose".equals( stackTraceElement.getMethodName() )
                              && AbstractIoService.class.getCanonicalName()
                                                        .equals( stackTraceElement.getClassName() ) ) {
                             System.err.println( "Detected hang in AbstractIoService.dispose()!" );
                         }
                     }
                     fail( "Thread should have died by now, supposed hang in AbstractIoService.dispose()" );
                 }
             } finally {
                 stopServer();
             }
         }
     }
 }