/*
* SitemapServlet.java
*
* Version: $Revision: 3705 $
*
* Date: $Date: 2009-04-11 17:02:24 +0000 (Sat, 11 Apr 2009) $
*
* Copyright (c) 2006, Hewlett-Packard Company and Massachusetts
* Institute of Technology. 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 the Hewlett-Packard Company nor the name of the
* Massachusetts Institute of Technology nor the names of their
* 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
* HOLDERS 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 org.dspace.app.webui.servlet;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.log4j.Logger;
import org.dspace.app.webui.util.JSPManager;
import org.dspace.authorize.AuthorizeException;
import org.dspace.core.ConfigurationManager;
import org.dspace.core.Context;
import org.dspace.core.Utils;
/**
* Servlet for retrieving sitemaps.
* <P>
* The servlet is configured via the "type" config parameter to serve either
* sitemaps.org or basic HTML sitemaps.
* <P>
* The "map" parameter specifies the index of a sitemap to serve. If no "map"
* parameter is specified, the sitemap index is served.
*
* @author Stuart Lewis
* @author Robert Tansley
* @version $Revision: 3705 $
*/
public class SitemapServlet extends DSpaceServlet
{
/** log4j category */
private static Logger log = Logger.getLogger(SitemapServlet.class);
/** true if we are for serving sitemap.org sitemaps, false otherwise */
private boolean forSitemapsOrg;
public void init()
{
forSitemapsOrg = false;
String initParam = getInitParameter("type");
if (initParam != null && initParam.equalsIgnoreCase("sitemaps.org"))
{
forSitemapsOrg = true;
}
else if (initParam == null || !initParam.equalsIgnoreCase("html"))
{
log.warn("Invalid initialization parameter for servlet "
+ getServletName() + ": assuming basic HTML");
}
}
protected void doDSGet(Context context, HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException,
SQLException, AuthorizeException
{
String param = request.getParameter("map");
String ext = (forSitemapsOrg ? ".xml.gz" : ".html");
String mimeType = (forSitemapsOrg ? "text/xml" : "text/html");
String fileStem = (param == null ? "sitemap_index" : "sitemap" + param);
sendFile(request, response, fileStem + ext, mimeType, forSitemapsOrg);
}
private void sendFile(HttpServletRequest request,
HttpServletResponse response, String file, String mimeType,
boolean compressed) throws ServletException, IOException
{
File f = new File(ConfigurationManager.getProperty("sitemap.dir"), file);
if (!f.exists())
{
response.setStatus(HttpServletResponse.SC_NOT_FOUND);
JSPManager.showJSP(request, response, "/error/404.jsp");
return;
}
long lastMod = f.lastModified();
response.setDateHeader("Last-Modified", lastMod);
// Check for if-modified-since header
long modSince = request.getDateHeader("If-Modified-Since");
if (modSince != -1 && lastMod < modSince)
{
// Sitemap file has not been modified since requested date,
// hence bitstream has not; return 304
response.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
return;
}
if (compressed)
{
response.setHeader("Content-Encoding", "gzip");
}
// Pipe the bits
InputStream is = new FileInputStream(f);
try
{
// Set the response MIME type
response.setContentType(mimeType);
// Response length
response.setHeader("Content-Length", String.valueOf(f.length()));
Utils.bufferedCopy(is, response.getOutputStream());
}
finally
{
is.close();
}
response.getOutputStream().flush();
}
}