ServiceFilter.java :  » Google-tech » vosao » org » vosao » filter » Java Open Source

/**
 * Vosao CMS. Simple CMS for Google App Engine.
 * 
 * Copyright (C) 2009-2010 Vosao development team.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * email: vosao.dev@gmail.com
 */

package org.vosao.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.jabsorb.JSONRPCBridge;
import org.vosao.common.VosaoContext;
import org.vosao.service.BackService;
import org.vosao.service.FrontService;

public class ServiceFilter extends AbstractFilter implements Filter {

  public ServiceFilter() {
    super();
  }

  public void doFilter(ServletRequest request, ServletResponse response,
      FilterChain chain) throws IOException, ServletException {
    HttpServletRequest httpRequest = (HttpServletRequest) request;
    HttpSession session = httpRequest.getSession(true);
    VosaoContext ctx = VosaoContext.getInstance();
        boolean backService = isLoggedIn(httpRequest) 
          && ctx.getUser() != null 
          && !ctx.getUser().isSiteUser();
    enableFrontService(session);
        if (backService) {
          enableBackService(session);
        }
        chain.doFilter(request, response);
    disableFrontService(session);
        if (backService) {
      disableBackService(session);
    }
  }

  private void enableBackService(HttpSession session) {
    JSONRPCBridge bridge = getJSONRPCBridge(session);
    getBackService().register(bridge);
  }

  private void enableFrontService(HttpSession session) {
    JSONRPCBridge bridge = getJSONRPCBridge(session);
    getFrontService().register(bridge);
  }
  
  private void disableBackService(HttpSession session) {
    JSONRPCBridge bridge = getJSONRPCBridge(session);
    getBackService().unregister(bridge);
  }

  private void disableFrontService(HttpSession session) {
    JSONRPCBridge bridge = getJSONRPCBridge(session);
    getFrontService().unregister(bridge);
  }

  private JSONRPCBridge getJSONRPCBridge(HttpSession session) {
    if (session.getAttribute("JSONRPCBridge") == null) {
      session.setAttribute("JSONRPCBridge", new JSONRPCBridge());
    }
    return (JSONRPCBridge) session.getAttribute("JSONRPCBridge");
  }

  private FrontService getFrontService() {
    return VosaoContext.getInstance().getFrontService();
  }

  private BackService getBackService() {
    return VosaoContext.getInstance().getBackService();
  }
  
}