Metacat

/**

 *  '$RCSfile$'

 *  Copyright: 2005 University of New Mexico and the

 *             Regents of the University of California and the

 *             National Center for Ecological Analysis and Synthesis

 *   '$Author$'

 *     '$Date$'

 * '$Revision$'

 *

 * 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.advancedsearch;

import javax.servlet.RequestDispatcher;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import edu.ucsb.nceas.metacat.client.*;

/**

 * @author dcosta

 *

 * The LoginServlet class executes a metacat login via a metacat client.

 */

public class LoginServlet extends HttpServlet {

   * Class fields

   */

  private static final String CONFIG_DIR = "WEB-INF";

  private static final String CONFIG_NAME = "metacat.properties";

  // Instance Variables

  private String contextString = "";

  // Methods

  /**

   * Executes a metacat login action. On a successful login, the metacat object

   * is stored as an attribute of the HttpSession object.

   */

  public void doPost(HttpServletRequest request, HttpServletResponse response)

          throws IOException, ServletException {

    RequestDispatcher dispatcher;

    HttpSession httpSession = request.getSession();

    LoginBean loginBean;

    boolean loginSuccess = false;

    Metacat metacat = (Metacat) httpSession.getAttribute("metacat");

    MetacatLogin metacatLogin;

    String metacatURL;

    ServletContext servletContext = httpSession.getServletContext();

    String username;

    // First check whether the metacat URL was set as a context-param.

    metacatURL = servletContext.getInitParameter("metacatURL");

    // If no metacat URL was configured, then derive the metacat URL from the

    // server name and server port.

    if (metacatURL == null || metacatURL.equals("")) {

      MetacatHelper metacatHelper = new MetacatHelper();

      String serverName = request.getServerName();

      int serverPort = request.getServerPort();

       metacatHelper.constructMetacatURL(serverName, serverPort, contextString);

    if (metacat == null) {

      try {

        metacat = MetacatFactory.createMetacatConnection(metacatURL);

      }

      catch (MetacatInaccessibleException mie) {

        System.err.println("Metacat Inaccessible:\n" + mie.getMessage());

      }

    }

    loginBean = (LoginBean) request.getAttribute("loginBean");

    metacatLogin = new MetacatLogin(loginBean);

    loginSuccess = metacatLogin.executeLogin(metacatURL, metacat);

    httpSession.setAttribute("metacat", metacat);

    // If login succeeds, forward to the simple search page. If login fails,

    // forward to the login page where an error message will be displayed.

    if (loginSuccess) {

      httpSession.setAttribute("loggedIn", new Boolean(true));

      username = loginBean.getUsername();

      httpSession.setAttribute("username", username);

      dispatcher = request.getRequestDispatcher("/style/skins/lter/index.jsp");

    else {

      request.setAttribute("loginFailure", "true");

      dispatcher = request.getRequestDispatcher("/style/skins/lter/index_login.jsp");

    dispatcher.forward(request, response);

  }

  /**

   * Initializes the servlet. Reads properties and initializes object fields.

   *

   * @throws ServletException

   */

  public void init(ServletConfig config) throws ServletException {

	ServletContext context = null;

    String dirPath;

    Options options = null;

    super.init(config);

    context = config.getServletContext();

    dirPath = context.getRealPath(CONFIG_DIR);

    File propertyFile = new File(dirPath, CONFIG_NAME);

    try {

      options = Options.initialize(propertyFile);

    }

    catch (IOException e) {

      System.err.println("Error in loading options: " + e.getMessage());

    }

    this.contextString = options.getOption("context");

  }