/*

  * Copyright (c) 2003-2011, Simon Brown

  * All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions are met:

  *

  *   - Redistributions of source code must retain the above copyright

  *     notice, this list of conditions and the following disclaimer.

  *

  *   - Redistributions in binary form must reproduce the above copyright

  *     notice, this list of conditions and the following disclaimer in

  *     the documentation and/or other materials provided with the

  *     distribution.

  *

  *   - Neither the name of Pebble nor the names of its contributors may

  *     be used to endorse or promote products derived from this software

  *     without specific prior written permission.

  *

  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

  * POSSIBILITY OF SUCH DAMAGE.

  */

 package net.sourceforge.pebble.web.action;

 import net.sourceforge.pebble.Constants;

 import net.sourceforge.pebble.api.confirmation.TrackBackConfirmationStrategy;

 import net.sourceforge.pebble.domain.*;

 import net.sourceforge.pebble.web.view.NotFoundView;

 import net.sourceforge.pebble.web.view.View;

 import net.sourceforge.pebble.web.view.impl.ConfirmTrackBackView;

 import net.sourceforge.pebble.web.view.impl.TrackBackLinkView;

 import org.apache.commons.logging.Log;

 import org.apache.commons.logging.LogFactory;

 import javax.servlet.ServletException;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 /**

  * Generates a TrackBack link for a blog entry.

  *

  * @author    Simon Brown

  */

 public class GenerateTrackBackLinkAction extends AbstractTrackBackAction {

   /** the log used by this class */

   private static Log log = LogFactory.getLog(GenerateTrackBackLinkAction.class);

   /**

    * Peforms the processing associated with this action.

    *

    * @param request  the HttpServletRequest instance

    * @param response the HttpServletResponse instance

    * @return the name of the next view

    */

   public View process(HttpServletRequest request, HttpServletResponse response) throws ServletException {

     Blog blog = (Blog)getModel().get(Constants.BLOG_KEY);

     BlogEntry blogEntry;

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

     BlogService service = new BlogService();

     try {

       blogEntry = service.getBlogEntry(blog, entry);

     } catch (BlogServiceException e) {

       throw new ServletException(e);

     }

     if (blogEntry == null) {

       // just send back a 404 - this is probably somebody looking for a way

       // to send comment spam ;-)

       return new NotFoundView();

     } else if (!blogEntry.isTrackBacksEnabled()) {

       return new NotFoundView();

     }

     getModel().put(Constants.BLOG_ENTRY_KEY, blogEntry);

     TrackBackConfirmationStrategy strategy = blog.getTrackBackConfirmationStrategy();

     if (strategy.confirmationRequired(blog)) {

       request.getSession().setAttribute(BLOG_ENTRY_ID, blogEntry.getId());

       strategy.setupConfirmation(request);

       return new ConfirmTrackBackView();

     } else {

       generateTrackBackLink(blogEntry);

       return new TrackBackLinkView();

     }

   }

 }