//
   //  ========================================================================
   //  Copyright (c) 1995-2013 Mort Bay Consulting Pty. Ltd.
   //  ------------------------------------------------------------------------
   //  All rights reserved. This program and the accompanying materials
   //  are made available under the terms of the Eclipse Public License v1.0
   //  and Apache License v2.0 which accompanies this distribution.
   //
   //      The Eclipse Public License is available at
  //      http://www.eclipse.org/legal/epl-v10.html
  //
  //      The Apache License v2.0 is available at
  //      http://www.opensource.org/licenses/apache2.0.php
  //
  //  You may elect to redistribute this code under either of these licenses.
  //  ========================================================================
  //
  
  package org.eclipse.jetty.embedded;
  
  import java.util.Collections;
  
  import org.eclipse.jetty.security.ConstraintMapping;
  import org.eclipse.jetty.security.ConstraintSecurityHandler;
  import org.eclipse.jetty.security.HashLoginService;
  import org.eclipse.jetty.security.LoginService;
  import org.eclipse.jetty.security.authentication.BasicAuthenticator;
  import org.eclipse.jetty.server.Server;
  import org.eclipse.jetty.util.security.Constraint;
  
  public class SecuredHelloHandler
  {
      public static void main(String[] args) throws Exception
      {
          // Create a basic jetty server object that will listen on port 8080.  Note that if you set this to port 0
          // then a randomly available port will be assigned that you can either look in the logs for the port,
          // or programmatically obtain it for use in test cases.
          Server server = new Server(8080);
  
          // Since this example is for our test webapp, we need to setup a LoginService so this shows how to create a
          // very simple hashmap based one.  The name of the LoginService needs to correspond to what is configured a
          // webapp's web.xml and since it has a lifecycle of its own we register it as a bean with the Jetty server
          // object so it can be started and stopped according to the lifecycle of the server itself. In this example
          // the name can be whatever you like since we are not dealing with webapp realms.
          LoginService loginService = new HashLoginService("MyRealm","src/test/resources/realm.properties");
          server.addBean(loginService); 
  
          // A security handler is a jetty handler that secures content behind a particular portion of a url space. The
          // ConstraintSecurityHandler is a more specialized handler that allows matching of urls to different
          // constraints. The server sets this as the first handler in the chain,
          // effectively applying these constraints to all subsequent handlers in the chain.
          ConstraintSecurityHandler security = new ConstraintSecurityHandler();
          server.setHandler(security);
  
          // This constraint requires authentication and in addition that an authenticated user be a member of a given
          // set of roles for authorization purposes.
          Constraint constraint = new Constraint();
          constraint.setName("auth");
          constraint.setAuthenticate( true );
          constraint.setRoles(new String[]{"user", "admin"});
  
          // Binds a url pattern with the previously created constraint. The roles for this constraing mapping are
          // mined from the Constraint itself although methods exist to declare and bind roles separately as well.
          ConstraintMapping mapping = new ConstraintMapping();
          mapping.setPathSpec( "/*" );
          mapping.setConstraint( constraint );
  
          // First you see the constraint mapping being applied to the handler as a singleton list,
          // however you can passing in as many security constraint mappings as you like so long as they follow the
          // mapping requirements of the servlet api. Next we set a BasicAuthenticator instance which is the object
          // that actually checks the credentials followed by the LoginService which is the store of known users, etc.
          security.setConstraintMappings(Collections.singletonList(mapping));
          security.setAuthenticator(new BasicAuthenticator());
          security.setLoginService(loginService);
  
          // The Hello Handler is the handler we are securing so we create one, and then set it as the handler on the
          // security handler to complain the simple handler chain.
          HelloHandler hh = new HelloHandler();
  
          // chain the hello handler into the security handler
          security.setHandler(hh);
  
          // Start things up! By using the server.join() the server thread will join with the current thread.
          // See "http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Thread.html#join()" for more details.
          server.start();
          server.join();
      }
  }