/*

  * 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.event.blogentry;

 import net.sourceforge.pebble.api.event.blogentry.BlogEntryEvent;

 import net.sourceforge.pebble.audit.AuditTrail;

 import net.sourceforge.pebble.decorator.PubSubHubBubFeedDecorator;

 import net.sourceforge.pebble.domain.Blog;

 import net.sourceforge.pebble.domain.BlogEntry;

 import net.sourceforge.pebble.domain.Category;

 import net.sourceforge.pebble.domain.Tag;

 import org.apache.commons.httpclient.HttpClient;

 import org.apache.commons.httpclient.methods.PostMethod;

 import org.apache.commons.logging.Log;

 import org.apache.commons.logging.LogFactory;

 import javax.servlet.http.HttpServletResponse;

 import java.io.IOException;

 import java.util.Arrays;

 import java.util.Collection;

 import java.util.Collections;

 /**

  * Listener that posts to a PubSubHubBub Hub when a blog entry is added/published/changed.

  *

  * @author James Roper

  */

 public class PubSubHubBubBlogEntryListener extends BlogEntryListenerSupport {

   private final static String HUB_MODE_PARAM = "hub.mode";

   private final static String HUB_URL_PARAM = "hub.url";

   private final static String HUB_MODE = "publish";

   private final static String ATOM_XML = "atom.xml";

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

   @Override

   public void blogEntryAdded(BlogEntryEvent event) {

     if (event.getBlogEntry().isPublished()) {

       postToHubs(event);

     }

   }

   @Override

   public void blogEntryRemoved(BlogEntryEvent event) {

     if (event.getBlogEntry().isPublished()) {

      postToHubs(event);

     }

   }

   @Override

   public void blogEntryChanged(BlogEntryEvent event) {

     if (event.getBlogEntry().isPublished()) {

       postToHubs(event);

     }

   }

   @Override

   public void blogEntryPublished(BlogEntryEvent event) {

     postToHubs(event);

   }

   @Override

   public void blogEntryUnpublished(BlogEntryEvent event) {

     postToHubs(event);

   }

   private void postToHubs(BlogEntryEvent event) {

     BlogEntry entry = event.getBlogEntry();

     Blog blog = entry.getBlog();

     String blogUrl = blog.getUrl();

     for (String hub : getHubs(blog)) {

       HttpClient httpClient = new HttpClient();

       PostMethod method = new PostMethod(hub);

       method.addParameter(HUB_MODE_PARAM, HUB_MODE);

       // Add every feed that might have this

       method.addParameter(HUB_URL_PARAM, blogUrl + ATOM_XML);

       for (Category category : entry.getCategories()) {

         method.addParameter(HUB_URL_PARAM, category.getPermalink() + ATOM_XML);

       }

       for (Tag tag : entry.getAllTags()) {

         method.addParameter(HUB_URL_PARAM, tag.getPermalink() + ATOM_XML);

       }

       method.addParameter(HUB_URL_PARAM, blogUrl + "authors/" + entry.getAuthor() + "/" + ATOM_XML);

       try {

         int rc = httpClient.executeMethod(method);

         if (rc != HttpServletResponse.SC_NO_CONTENT) {

           String errorMessage = "Unexpected response code received from hub: " + hub + " - " + rc + " " +

               method.getStatusText();

           log.warn(errorMessage);

           blog.warn(errorMessage);

         }

       } catch (IOException e) {

         log.error("Error posting to hub: " + hub, e);

         blog.warn("Error publishing to hub: " + hub + ". Message: " + e.getMessage());

       }

     }

   }

   private Collection<String> getHubs(Blog blog) {

     String hubs = blog.getPluginProperties().getProperty(PubSubHubBubFeedDecorator.HUBS_PROPERTY);

     if (hubs == null || hubs.length() == 0) {

       return Collections.emptyList();

     }

     return Arrays.asList(hubs.split(","));

   }

 }