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: daigle $'

 *     '$Date: 2008-07-24 13:47:03 -0700 (Thu, 24 Jul 2008) $'

 * '$Revision: 4155 $'

 *

 * 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.util.Vector;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.httpclient.HttpClient;

import org.apache.log4j.Logger;

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

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

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

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

import edu.ucsb.nceas.utilities.GeneralPropertyException;

/**

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

 * of the configuration values.

 */

public class GeoserverAdmin extends MetaCatAdmin {

	private static GeoserverAdmin geoserverAdmin = null;

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

	/**

	 * private constructor since this is a singleton

	 */

	private GeoserverAdmin() throws AdminException {

	}

	/**

	 * Get the single instance of GeoserverAdmin.

	 * 

	 * @return the single instance of GeoserverAdmin

	 */

	public static GeoserverAdmin getInstance() throws AdminException {

		if (geoserverAdmin == null) {

			geoserverAdmin = new GeoserverAdmin();

		}

		return geoserverAdmin;

	}

	/**

	 * Handle configuration of the database the first time that Metacat starts

	 * or when it is explicitly called. Collect necessary update information

	 * from the administrator.

	 * 

	 * @param request

	 *            the http request information

	 * @param response

	 *            the http response to be sent back to the client

	 */

	public void configureGeoserver(HttpServletRequest request,

			HttpServletResponse response) throws AdminException {

		String processForm = request.getParameter("processForm");

		String bypass = request.getParameter("bypass");

		String formErrors = (String) request.getAttribute("formErrors");

		if (processForm == null || !processForm.equals("true") || formErrors != null) {

			// The servlet configuration parameters have not been set, or there

			// were form errors on the last attempt to configure, so redirect to

			// the web form for configuring metacat

			try {

				// get the current metacat version and the database version. If

				// the database version is older that the metacat version, run

				// the appropriate scripts to get them synchronized.

				String username = PropertyService.getProperty("geoserver.username");

				String password = PropertyService.getProperty("geoserver.password");

				request.setAttribute("geoserver.username", username);

				request.setAttribute("geoserver.password", password);

				// Forward the request to the JSP page

				RequestUtil.forwardRequest(request, response,

						"/admin/geoserver-configuration.jsp");

			} catch (GeneralPropertyException gpe) {

				throw new AdminException("Problem getting or setting property while " 

						+ "initializing system properties page: " + gpe.getMessage());

			} catch (IOException ioe) {

				throw new AdminException("IO problem while initializing "

						+ "system properties page:" + ioe.getMessage());

			} catch (ServletException se) {

				throw new AdminException("problem forwarding request while "

						+ "initializing system properties page: " + se.getMessage());

			}  

		} else if (bypass != null && bypass.equals("true")) {

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

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

			// Bypass the geoserver configuration. This will not keep

			// Metacat from running.

			try {

				PropertyService.setProperty("configutil.geoserverConfigured",

						PropertyService.BYPASSED);

			} catch (GeneralPropertyException gpe) {

				String errorMessage = "Problem getting or setting property while "

					+ "processing system properties page: " + gpe.getMessage();

				logMetacat.error(errorMessage);

				processingErrors.add(errorMessage);

			}

			try {

				if (processingErrors.size() > 0) {

					RequestUtil.clearRequestMessages(request);

					RequestUtil.setRequestErrors(request, processingErrors);

					RequestUtil.forwardRequest(request, response, "/admin");

				} else {			

					// Reload the main metacat configuration page

					processingSuccess.add("Geoserver configuration successfully bypassed");

					RequestUtil.clearRequestMessages(request);

					RequestUtil.setRequestSuccess(request, processingSuccess);

					RequestUtil.forwardRequest(request, response, 

							"/admin?configureType=configure&processForm=false");

				}

			} catch (ServletException se) {

				throw new AdminException("problem forwarding request while "

						+ "processing geoservices configuration page: " + se.getMessage());

			} catch (IOException ioe) {

				throw new AdminException("IO problem while processing geoservices "

						+ "geoservices page: " + ioe.getMessage());

			} 

		} else {

			// The configuration form is being submitted and needs to be

			// processed, setting the properties in the configuration file

			// then restart metacat

			// The configuration form is being submitted and needs to be

			// processed.

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

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

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

			try {

				// Validate that the options provided are legitimate. Note that

				// we've allowed them to persist their entries. As of this point

				// there is no other easy way to go back to the configure form

				// and preserve their entries.

				validationErrors.addAll(validateOptions(request));

				String username = (String)request.getParameter("geoserver.username");

				String password = (String)request.getParameter("geoserver.password");

				if (username == null || password == null) {

					validationErrors.add("User Name and Password can not be null");

				} else {

					HttpClient httpClient = new HttpClient();

					GeoserverUtil.loginAdmin(httpClient);

					GeoserverUtil.changePassword(httpClient, username, password);

					PropertyService.setPropertyNoPersist("geoserver.username", username);

					PropertyService.setPropertyNoPersist("geoserver.password", password);

					PropertyService.persistProperties();

					// write the backup properties to a location outside the

					// application directories so they will be available after

					// the next upgrade

					PropertyService.persistMainBackupProperties(request.getSession()

							.getServletContext());

				}

			} catch (UtilException ue) {

				String errorMessage = "Error updating geoserver password: " + ue.getMessage();

				logMetacat.error(errorMessage);

				processingErrors.add(errorMessage);

			} catch (GeneralPropertyException gpe) {

				String errorMessage = "Problem getting or setting property while "

						+ "processing system properties page: " + gpe.getMessage();

				logMetacat.error(errorMessage);

				processingErrors.add(errorMessage);

			}

			try {

				if (validationErrors.size() > 0 || processingErrors.size() > 0) {

					RequestUtil.clearRequestMessages(request);

					RequestUtil.setRequestFormErrors(request, validationErrors);

					RequestUtil.setRequestErrors(request, processingErrors);

					RequestUtil.forwardRequest(request, response, "/admin");

				} else {

					// Now that the options have been set, change the

					// 'propertiesConfigured' option to 'true'

					PropertyService.setProperty("configutil.geoserverConfigured",

							PropertyService.CONFIGURED);

					// Reload the main metacat configuration page

					processingSuccess.add("Geoserver successfully configured");

					RequestUtil.clearRequestMessages(request);

					RequestUtil.setRequestSuccess(request, processingSuccess);

					RequestUtil.forwardRequest(request, response, 

							"/admin?configureType=configure&processForm=false");

				}

			} catch (ServletException se) {

				throw new AdminException("problem forwarding request while "

						+ "processing geoservices configuration page: " + se.getMessage());

			} catch (IOException ioe) {

				throw new AdminException("IO problem while processing geoservices "

						+ "geoservices page: " + ioe.getMessage());

			} catch (GeneralPropertyException gpe) {

				throw new AdminException("problem with properties while "

						+ "processing geoservices configuration page: " + gpe.getMessage());

			}

		}

	}

	/**

	 * 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;

	}

}