/**
 * 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.activemq.transport.tcp;

import java.net.URI;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.Iterator;
import java.util.Map;

import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.TransportConnector;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import static org.junit.Assert.*;

public class SslContextNBrokerServiceTest {

   private static final transient Logger LOG = LoggerFactory.getLogger(SslContextNBrokerServiceTest.class);

   private ClassPathXmlApplicationContext context;
   Map<String, BrokerService> beansOfType;

   @Test(timeout = 3 * 60 * 1000)
   public void testDummyConfigurationIsolation() throws Exception {
      assertTrue("dummy bean has dummy cert", verifyCredentials("dummy"));
   }

   @Test(timeout = 3 * 60 * 1000)
   public void testActiveMQDotOrgConfigurationIsolation() throws Exception {
      assertTrue("good bean has amq cert", verifyCredentials("activemq.org"));
   }

   private boolean verifyCredentials(String name) throws Exception {
      boolean result = false;
      BrokerService broker = getBroker(name);
      assertNotNull(name, broker);
      broker.start();
      broker.waitUntilStarted();
      try {
         result = verifySslCredentials(broker);
      }
      finally {
         broker.stop();
      }
      return result;
   }

   private boolean verifySslCredentials(BrokerService broker) throws Exception {
      TransportConnector connector = broker.getTransportConnectors().get(0);
      URI brokerUri = connector.getConnectUri();

      SSLContext context = SSLContext.getInstance("TLS");
      CertChainCatcher catcher = new CertChainCatcher();
      context.init(null, new TrustManager[]{catcher}, null);

      SSLSocketFactory factory = context.getSocketFactory();
      LOG.info("Connecting to broker: " + broker.getBrokerName() + " on: " + brokerUri.getHost() + ":" + brokerUri.getPort());
      SSLSocket socket = (SSLSocket) factory.createSocket(brokerUri.getHost(), brokerUri.getPort());
      socket.setSoTimeout(2 * 60 * 1000);
      socket.startHandshake();
      socket.close();

      boolean matches = false;
      if (catcher.serverCerts != null) {
         for (int i = 0; i < catcher.serverCerts.length; i++) {
            X509Certificate cert = catcher.serverCerts[i];
            LOG.info(" " + (i + 1) + " Issuer " + cert.getIssuerDN());
         }
         if (catcher.serverCerts.length > 0) {
            String issuer = catcher.serverCerts[0].getIssuerDN().toString();
            if (issuer.indexOf(broker.getBrokerName()) != -1) {
               matches = true;
            }
         }
      }
      return matches;
   }

   private BrokerService getBroker(String name) {
      BrokerService result = null;
      Iterator<BrokerService> iterator = beansOfType.values().iterator();
      while (iterator.hasNext()) {
         BrokerService candidate = iterator.next();
         if (candidate.getBrokerName().equals(name)) {
            result = candidate;
            break;
         }
      }
      return result;
   }

   @Before
   public void setUp() throws Exception {
      // System.setProperty("javax.net.debug", "ssl");
      Thread.currentThread().setContextClassLoader(SslContextNBrokerServiceTest.class.getClassLoader());
      context = new ClassPathXmlApplicationContext("org/apache/activemq/transport/tcp/n-brokers-ssl.xml");
      beansOfType = context.getBeansOfType(BrokerService.class);
   }

   @After
   public void tearDown() throws Exception {
      context.destroy();
   }

   class CertChainCatcher implements X509TrustManager {

      X509Certificate[] serverCerts;

      @Override
      public void checkClientTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {
      }

      @Override
      public void checkServerTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {
         serverCerts = arg0;
      }

      @Override
      public X509Certificate[] getAcceptedIssuers() {
         return null;
      }
   }
}
