loginaction.java

老外的在线考试

/*
 * CyberTester - J2EE Web application for creating, delivering and managing tests/exams/surveys. 
 * Copyright (C) 2003 CyberDemia Research and Services Pty Ltd
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program (see the file COPYING); if not, write to the
 * Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * See the COPYING file located in the top-level-directory of
 * the archive of this program for complete text of license.
 */
package com.cyberdemia.cybertester;

import javax.servlet.*;
import javax.servlet.http.*;
import org.apache.struts.action.*;
import com.cyberdemia.cybertester.Constants;
import com.cyberdemia.user.*;
import javax.ejb.CreateException;
import java.text.DateFormat;
import java.util.Date;
import java.util.HashMap;

/**
 * 
 * LoginAction is a Struts action that performs login to CyberTester.
 * Responsible for setting up various session-wide objects such as login ID.
 * 
 * @author Alexander Yap
 */
public final class LoginAction extends Action
{
	public ActionForward execute(ActionMapping mapping, ActionForm form,
		HttpServletRequest request, HttpServletResponse response)
		throws Exception
	{

		String userLogin = request.getRemoteUser();
		if (userLogin==null)
		{
			throw new ServletException("No user has been authenticated.");
		}
		CyberTesterUtils.getLogger().info("Logging in user identity="+userLogin);
		// Creates new session and store the user name
		HttpSession session = request.getSession(true);
		session.setAttribute(Constants.USER_LOGIN_KEY, userLogin );
		session.setAttribute(Constants.LOGIN_TIME_KEY, DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.SHORT).format(new Date()) );
		session.setAttribute(Constants.CHARTS_CACHE_KEY, new HashMap());
		UserManagerHome userMgrHome = CyberTesterUtils.getUserManagerHome();
		ActionErrors errors = new ActionErrors();		
		UserManager userMgr = (UserManager)userMgrHome.create();
		UserData userData = userMgr.getUserDataByEmail(userLogin);
		if (userData!=null)
		{
			String userId = userData.getId();
			session.setAttribute(Constants.USER_ID_KEY, userId );
		}
		else
		{
			errors.add(ActionErrors.GLOBAL_ERROR, new ActionError("login.user.unknown", userLogin));
		}

		if (!errors.isEmpty())
		{
			CyberTesterUtils.getLogger().warning("Failed to login user "+userLogin);
			saveErrors(request, errors);
			return mapping.findForward(Constants.ERROR);
		}
		
		String target = Constants.ERROR;
		if (request.isUserInRole("admin"))
		{
			target = "admin";
			session.setAttribute(Constants.IS_ADMINISTRATOR_KEY, Boolean.TRUE);		
			CyberTesterUtils.getLogger().info("Administrator "+userLogin+" logged in.");
		}
		else if (request.isUserInRole("student"))
		{
			target = "student";
		}

		return (mapping.findForward(target));
	}
}