Metacat

/**

 *  '$RCSfile$'

 *    Purpose: A Class that implements database configuration methods

 *  Copyright: 2008 Regents of the University of California and the

 *             National Center for Ecological Analysis and Synthesis

 *    Authors: Michael Daigle

 * 

 *   '$Author: leinfelder $'

 *     '$Date: 2011-11-17 14:47:00 -0800 (Thu, 17 Nov 2011) $'

 * '$Revision: 6672 $'

 *

 * 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; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

package edu.ucsb.nceas.metacat.admin;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Enumeration;

import java.util.Hashtable;

import java.util.Vector;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import org.apache.log4j.Logger;

import edu.ucsb.nceas.metacat.replication.ReplicationService;

import edu.ucsb.nceas.metacat.service.SessionService;

import edu.ucsb.nceas.metacat.shared.MetacatUtilException;

import edu.ucsb.nceas.metacat.shared.ServiceException;

import edu.ucsb.nceas.metacat.util.AuthUtil;

import edu.ucsb.nceas.metacat.util.RequestUtil;

import edu.ucsb.nceas.metacat.util.SessionData;

/**

 * Control the display of the database configuration page and the processing

 * of the configuration values.

 */

public class ReplicationAdmin extends MetacatAdmin {

	private static ReplicationAdmin instance = null;

	private Logger logMetacat = Logger.getLogger(ReplicationAdmin.class);

	/**

	 * private constructor since this is a singleton

	 */

	private ReplicationAdmin() throws AdminException {

	}

	/**

	 * Get the single instance of D1Admin.

	 * 

	 * @return the single instance of D1Admin

	 */

	public static ReplicationAdmin getInstance() throws AdminException {

		if (instance == null) {

			instance = new ReplicationAdmin();

		}

		return instance;

	}

	/**

	 * Handle configuration of replication -- pass through to the other handler

	 * 

	 * @param request

	 *            the http request information

	 * @param response

	 *            the http response to be sent back to the client

	 * @throws ServiceException 

	 * @throws IOException 

	 * @throws MetacatUtilException 

	 */

	public void handleRequest(HttpServletRequest request,

			HttpServletResponse response) throws AdminException, ServiceException, IOException, MetacatUtilException {

		PrintWriter out = null;

		Hashtable<String, String[]> params = new Hashtable<String, String[]>();

		Enumeration<String> paramlist = request.getParameterNames();

		while (paramlist.hasMoreElements()) {

			String name = (String) paramlist.nextElement();

			String[] value = request.getParameterValues(name);

			params.put(name, value);

		}

		String action = "";

		if (!params.isEmpty() && params.get("action") != null) {

			action = ((String[]) params.get("action"))[0];

		}

		// start, stop, getall and servercontrol need to check if user is administrator

		HttpSession session = request.getSession(true);

		SessionData sessionData = null;

		String sessionId = "";

		String username = "";

		String[] groupnames = { "" };

		if (params.containsKey("sessionid")) {

			sessionId = ((String[]) params.get("sessionid"))[0];

			logMetacat.info("sessionid " + sessionId);

			if (SessionService.getInstance().isSessionRegistered(sessionId)) {

				logMetacat.info("Looking up id " + sessionId + " in registered sessions");

				sessionData = SessionService.getInstance().getRegisteredSession(sessionId);

			}

		}

		if (sessionData == null) {

			sessionData = new SessionData(session.getId(), 

					(String) session.getAttribute("username"), 

					(String[]) session.getAttribute("groups"),

					(String) session.getAttribute("password"), 

					(String) session.getAttribute("name"));

		}

		username = sessionData.getUserName();

		logMetacat.warn("The user name from session is: " + username);

		groupnames = sessionData.getGroupNames();

		if (!AuthUtil.isAdministrator(username, groupnames)) {

			String msg = "The user \"" + username

			+ "\" is not authorized for this action: " + action;

			out = response.getWriter();

			out.print("<error>");

			out.print(msg);

			out.print("</error>");

			out.close();

			logMetacat.warn(msg);

			return;

		}

		if (action.equals("stop")) {

			// stop the replication server

			ReplicationService.getInstance().stopReplication();

			out = response.getWriter();

			out.println("Replication Handler Stopped");

		} else if (action.equals("start")) {

			ReplicationService.getInstance().startReplication(params);

			out = response.getWriter();

			out.println("Replication Handler Started");

		} else if (action.equals("getall")) {

			ReplicationService.getInstance().runOnce();

			response.setContentType("text/html");

			out = response.getWriter();

			out.println("<html><body>\"Get All\" Done</body></html>");

		} else if (action.equals("servercontrol")) {

			ReplicationService.handleServerControlRequest(params, response);

		} else {

			// Forward the request to the JSP page

			RequestUtil.forwardRequest(request, response, "/admin/replication-configuration.jsp", null);

		}

	}

	/**

	 * Validate the most important configuration options submitted by the user.

	 * 

	 * @return a vector holding error message for any fields that fail

	 *         validation.

	 */

	protected Vector<String> validateOptions(HttpServletRequest request) {

		Vector<String> errorVector = new Vector<String>();

		// TODO MCD validate options.

		return errorVector;

	}

}