/**
 * 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;

import javax.net.ssl.KeyManager;
import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.KeyStore;
import java.security.SecureRandom;

import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.SslBrokerService;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class ActiveMQSslConnectionFactoryTest extends CombinationTestSupport {

   private static final Log LOG = LogFactory.getLog(ActiveMQSslConnectionFactoryTest.class);

   public static final String KEYSTORE_TYPE = "jks";
   public static final String PASSWORD = "password";
   public static final String SERVER_KEYSTORE = "src/test/resources/server.keystore";
   public static final String TRUST_KEYSTORE = "src/test/resources/client.keystore";

   private ActiveMQConnection connection;
   private BrokerService broker;

   @Override
   protected void tearDown() throws Exception {
      // Try our best to close any previously opend connection.
      try {
         connection.close();
      } catch (Throwable ignore) {
      }
      // Try our best to stop any previously started broker.
      try {
         broker.stop();
      } catch (Throwable ignore) {
      }
   }

   public void testCreateTcpConnectionUsingKnownPort() throws Exception {
      // Control case: check that the factory can create an ordinary (non-ssl) connection.
      broker = createBroker("tcp://localhost:61610?wireFormat.tcpNoDelayEnabled=true");

      // This should create the connection.
      ActiveMQSslConnectionFactory cf = new ActiveMQSslConnectionFactory("tcp://localhost:61610?wireFormat.tcpNoDelayEnabled=true");
      connection = (ActiveMQConnection) cf.createConnection();
      assertNotNull(connection);
      connection.start();
      connection.stop();
      brokerStop();
   }

   public void testCreateFailoverTcpConnectionUsingKnownPort() throws Exception {
      // Control case: check that the factory can create an ordinary (non-ssl) connection.
      broker = createBroker("tcp://localhost:61610?wireFormat.tcpNoDelayEnabled=true");

      // This should create the connection.
      ActiveMQSslConnectionFactory cf = new ActiveMQSslConnectionFactory("failover:(tcp://localhost:61610?wireFormat.tcpNoDelayEnabled=true)");
      connection = (ActiveMQConnection) cf.createConnection();
      assertNotNull(connection);
      connection.start();
      connection.stop();
      brokerStop();
   }

   public void testCreateSslConnection() throws Exception {
      // Create SSL/TLS connection with trusted cert from truststore.
      String sslUri = "ssl://localhost:61611";
      broker = createSslBroker(sslUri);
      assertNotNull(broker);

      // This should create the connection.
      ActiveMQSslConnectionFactory cf = new ActiveMQSslConnectionFactory(sslUri);
      cf.setTrustStore("server.keystore");
      cf.setTrustStorePassword("password");
      connection = (ActiveMQConnection) cf.createConnection();
      LOG.info("Created client connection");
      assertNotNull(connection);
      connection.start();
      connection.stop();
      brokerStop();
   }

   public void testFailoverSslConnection() throws Exception {
      // Create SSL/TLS connection with trusted cert from truststore.
      String sslUri = "ssl://localhost:61611";
      broker = createSslBroker(sslUri);
      assertNotNull(broker);

      // This should create the connection.
      ActiveMQSslConnectionFactory cf = new ActiveMQSslConnectionFactory("failover:(" + sslUri + ")?maxReconnectAttempts=4");
      cf.setTrustStore("server.keystore");
      cf.setTrustStorePassword("password");
      connection = (ActiveMQConnection) cf.createConnection();
      LOG.info("Created client connection");
      assertNotNull(connection);
      connection.start();
      connection.stop();

      brokerStop();
   }

   public void testFailoverSslConnectionWithKeyAndTrustManagers() throws Exception {
      String sslUri = "ssl://localhost:61611";
      broker = createSslBroker(sslUri);
      assertNotNull(broker);

      ActiveMQSslConnectionFactory cf = new ActiveMQSslConnectionFactory("failover:(" + sslUri + ")?maxReconnectAttempts=4");
      cf.setKeyAndTrustManagers(getKeyManager(), getTrustManager(), new SecureRandom());
      connection = (ActiveMQConnection) cf.createConnection();
      LOG.info("Created client connection");
      assertNotNull(connection);
      connection.start();
      connection.stop();

      brokerStop();
   }

   public void testNegativeCreateSslConnectionWithWrongPassword() throws Exception {
      // Create SSL/TLS connection with trusted cert from truststore.
      String sslUri = "ssl://localhost:61611";
      broker = createSslBroker(sslUri);
      assertNotNull(broker);

      // This should FAIL to connect, due to wrong password.
      ActiveMQSslConnectionFactory cf = new ActiveMQSslConnectionFactory(sslUri);
      cf.setTrustStore("server.keystore");
      cf.setTrustStorePassword("wrongPassword");
      try {
         connection = (ActiveMQConnection) cf.createConnection();
      } catch (javax.jms.JMSException ignore) {
         // Expected exception
         LOG.info("Expected java.io.Exception [" + ignore + "]");
      }
      assertNull(connection);

      brokerStop();
   }

   public void testNegativeCreateSslConnectionWithWrongCert() throws Exception {
      // Create SSL/TLS connection with trusted cert from truststore.
      String sslUri = "ssl://localhost:61611";
      broker = createSslBroker(sslUri);
      assertNotNull(broker);

      // This should FAIL to connect, due to wrong password.
      ActiveMQSslConnectionFactory cf = new ActiveMQSslConnectionFactory(sslUri);
      cf.setTrustStore("dummy.keystore");
      cf.setTrustStorePassword("password");
      try {
         connection = (ActiveMQConnection) cf.createConnection();
      } catch (javax.jms.JMSException ignore) {
         // Expected exception
         LOG.info("Expected SSLHandshakeException [" + ignore + "]");
      }
      assertNull(connection);

      brokerStop();
   }

   protected BrokerService createBroker(String uri) throws Exception {
      // Start up a broker with a tcp connector.
      BrokerService service = new BrokerService();
      service.setPersistent(false);
      service.setUseJmx(false);
      service.addConnector(uri);
      service.start();

      return service;
   }

   protected BrokerService createSslBroker(String uri) throws Exception {

      // http://java.sun.com/javase/javaseforbusiness/docs/TLSReadme.html
      // work around: javax.net.ssl.SSLHandshakeException: renegotiation is not allowed
      //System.setProperty("sun.security.ssl.allowUnsafeRenegotiation", "true");

      SslBrokerService service = new SslBrokerService();
      service.setPersistent(false);

      service.addConnector(uri);

      service.start();

      return service;
   }

   protected void brokerStop() throws Exception {
      broker.stop();
   }

   public static TrustManager[] getTrustManager() throws Exception {
      TrustManager[] trustStoreManagers = null;
      KeyStore trustedCertStore = KeyStore.getInstance(ActiveMQSslConnectionFactoryTest.KEYSTORE_TYPE);

      trustedCertStore.load(new FileInputStream(ActiveMQSslConnectionFactoryTest.TRUST_KEYSTORE), null);
      TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());

      tmf.init(trustedCertStore);
      trustStoreManagers = tmf.getTrustManagers();
      return trustStoreManagers;
   }

   public static KeyManager[] getKeyManager() throws Exception {
      KeyManagerFactory kmf = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
      KeyStore ks = KeyStore.getInstance(ActiveMQSslConnectionFactoryTest.KEYSTORE_TYPE);
      KeyManager[] keystoreManagers = null;

      byte[] sslCert = loadClientCredential(ActiveMQSslConnectionFactoryTest.SERVER_KEYSTORE);

      if (sslCert != null && sslCert.length > 0) {
         ByteArrayInputStream bin = new ByteArrayInputStream(sslCert);
         ks.load(bin, ActiveMQSslConnectionFactoryTest.PASSWORD.toCharArray());
         kmf.init(ks, ActiveMQSslConnectionFactoryTest.PASSWORD.toCharArray());
         keystoreManagers = kmf.getKeyManagers();
      }
      return keystoreManagers;
   }

   private static byte[] loadClientCredential(String fileName) throws IOException {
      if (fileName == null) {
         return null;
      }
      FileInputStream in = new FileInputStream(fileName);
      ByteArrayOutputStream out = new ByteArrayOutputStream();
      byte[] buf = new byte[512];
      int i = in.read(buf);
      while (i > 0) {
         out.write(buf, 0, i);
         i = in.read(buf);
      }
      in.close();
      return out.toByteArray();
   }

}
