LogoutFilter.java

/* vim: set ts=2 et sw=2 cindent fo=qroca: */

package com.globant.katari.login.local.view;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.acegisecurity.ui.logout.LogoutHandler;

/** This logout filter handles the logout by calling the acegi implementation.
 *
 * It behaves as the original LogoutHandler, but if the logout succeed the
 * current request parameters are appended to the success url.
 *
 * @author mariano.nardi
 */
public class LogoutFilter extends org.acegisecurity.ui.logout.LogoutFilter {

  /**
   * Creates a logout filters with the url to which the user will be forwarded
   * to and the set of handlers that will take care of the logout.
   *
   * @param logoutSuccessUrl the url where the user will be forwarded to once
   * the logout succeeds. It cannot be null or empty.
   *
   * @param handlers the collection of handlers that will take care of the
   * logout process. it cannot be empty.
   */
  public LogoutFilter(final String logoutSuccessUrl,
      final LogoutHandler[] handlers) {
    super(logoutSuccessUrl, handlers);
  }

  /**
   * Redirects the request to the given URL.
   *
   * It also appends the map of parameters to the url if they are available
   * in the request and the given url has no parameters yet.
   *
   * @param request the request associated with this forward.
   * @param response the server response in this forward.
   * @param url the url where the user will be redirected to.
   *
   * @throws IOException in case of an io error.
   */
  protected void sendRedirect(final HttpServletRequest request,
      final HttpServletResponse response, final String url)
      throws IOException {
    String redirectTo = url;
    if (!url.startsWith("http://") && !url.startsWith("https://")) {
      redirectTo = request.getContextPath() + redirectTo;
    }
    if (url.indexOf('?') == -1 && request.getQueryString() != null) {
      redirectTo += "?" + request.getQueryString();
    }

    response.sendRedirect(response.encodeRedirectURL(redirectTo));
  }
}