/**
 * 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.security;

import javax.security.auth.login.AppConfigurationEntry;
import javax.security.auth.login.Configuration;
import java.security.Principal;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

import junit.framework.TestCase;

import org.apache.activemq.broker.ConnectionContext;
import org.apache.activemq.broker.StubBroker;
import org.apache.activemq.command.ConnectionInfo;
import org.apache.activemq.jaas.GroupPrincipal;
import org.apache.activemq.jaas.UserPrincipal;
import org.apache.activemq.transport.tcp.StubX509Certificate;

public class JaasCertificateAuthenticationBrokerTest extends TestCase {

   StubBroker receiveBroker;

   JaasCertificateAuthenticationBroker authBroker;

   ConnectionContext connectionContext;
   ConnectionInfo connectionInfo;

   @Override
   protected void setUp() throws Exception {
      receiveBroker = new StubBroker();

      authBroker = new JaasCertificateAuthenticationBroker(receiveBroker, "");

      connectionContext = new ConnectionContext();
      connectionInfo = new ConnectionInfo();

      connectionInfo.setTransportContext(new StubX509Certificate[]{});
   }

   @Override
   protected void tearDown() throws Exception {
      super.tearDown();
   }

   private void setConfiguration(Set<String> userNames, Set<String> groupNames, boolean loginShouldSucceed) {
      HashMap<String, String> configOptions = new HashMap<>();

      String userNamesString;
      {
         Iterator<String> iter = userNames.iterator();
         userNamesString = "" + (iter.hasNext() ? iter.next() : "");
         while (iter.hasNext()) {
            userNamesString += "," + iter.next();
         }
      }

      String groupNamesString = "";
      {
         Iterator<String> iter = groupNames.iterator();
         groupNamesString = "" + (iter.hasNext() ? iter.next() : "");
         while (iter.hasNext()) {
            groupNamesString += "," + iter.next();
         }
      }

      configOptions.put(StubLoginModule.ALLOW_LOGIN_PROPERTY, loginShouldSucceed ? "true" : "false");
      configOptions.put(StubLoginModule.USERS_PROPERTY, userNamesString);
      configOptions.put(StubLoginModule.GROUPS_PROPERTY, groupNamesString);
      AppConfigurationEntry configEntry = new AppConfigurationEntry("org.apache.activemq.security.StubLoginModule", AppConfigurationEntry.LoginModuleControlFlag.REQUIRED, configOptions);

      StubJaasConfiguration jaasConfig = new StubJaasConfiguration(configEntry);

      Configuration.setConfiguration(jaasConfig);
   }

   public void testAddConnectionSuccess() {
      String dnUserName = "dnUserName";

      HashSet<String> userNames = new HashSet<>();
      userNames.add(dnUserName);

      HashSet<String> groupNames = new HashSet<>();
      groupNames.add("testGroup1");
      groupNames.add("testGroup2");
      groupNames.add("tesetGroup3");

      setConfiguration(userNames, groupNames, true);

      try {
         authBroker.addConnection(connectionContext, connectionInfo);
      } catch (Exception e) {
         fail("Call to addConnection failed: " + e.getMessage());
      }

      assertEquals("Number of addConnection calls to underlying Broker must match number of calls made to " + "AuthenticationBroker.", 1, receiveBroker.addConnectionData.size());

      ConnectionContext receivedContext = receiveBroker.addConnectionData.getFirst().connectionContext;

      assertEquals("The SecurityContext's userName must be set to that of the UserPrincipal.", dnUserName, receivedContext.getSecurityContext().getUserName());

      Set<Principal> receivedPrincipals = receivedContext.getSecurityContext().getPrincipals();

      for (Iterator<Principal> iter = receivedPrincipals.iterator(); iter.hasNext(); ) {
         Principal currentPrincipal = iter.next();

         if (currentPrincipal instanceof UserPrincipal) {
            if (userNames.remove(currentPrincipal.getName())) {
               // Nothing, we did good.
            } else {
               // Found an unknown userName.
               fail("Unknown UserPrincipal found");
            }
         } else if (currentPrincipal instanceof GroupPrincipal) {
            if (groupNames.remove(currentPrincipal.getName())) {
               // Nothing, we did good.
            } else {
               fail("Unknown GroupPrincipal found.");
            }
         } else {
            fail("Unexpected Principal subclass found.");
         }
      }

      if (!userNames.isEmpty()) {
         fail("Some usernames were not added as UserPrincipals");
      }

      if (!groupNames.isEmpty()) {
         fail("Some group names were not added as GroupPrincipals");
      }
   }

   public void testAddConnectionFailure() {
      HashSet<String> userNames = new HashSet<>();

      HashSet<String> groupNames = new HashSet<>();
      groupNames.add("testGroup1");
      groupNames.add("testGroup2");
      groupNames.add("tesetGroup3");

      setConfiguration(userNames, groupNames, false);

      boolean connectFailed = false;
      try {
         authBroker.addConnection(connectionContext, connectionInfo);
      } catch (SecurityException e) {
         connectFailed = true;
      } catch (Exception e) {
         fail("Failed to connect for unexpected reason: " + e.getMessage());
      }

      if (!connectFailed) {
         fail("Unauthenticated connection allowed.");
      }

      assertEquals("Unauthenticated connection allowed.", true, receiveBroker.addConnectionData.isEmpty());
   }

   public void testRemoveConnection() throws Exception {
      connectionContext.setSecurityContext(new StubSecurityContext());

      authBroker.removeConnection(connectionContext, connectionInfo, new Throwable());

      assertEquals("removeConnection should clear ConnectionContext.", null, connectionContext.getSecurityContext());

      assertEquals("Incorrect number of calls to underlying broker were made.", 1, receiveBroker.removeConnectionData.size());
   }
}
