001    //$HeadURL: svn+ssh://jwilden@svn.wald.intevation.org/deegree/base/branches/2.5_testing/src/org/deegree/enterprise/servlet/DownloadServlet.java $$
002    /*----------------------------------------------------------------------------
003     This file is part of deegree, http://deegree.org/
004     Copyright (C) 2001-2009 by:
005     - Department of Geography, University of Bonn
006     and
007     - lat/lon GmbH
008    
009     This library is free software; you can redistribute it and/or modify it under
010     the terms of the GNU Lesser General Public License as published by the Free
011     Software Foundation; either version 2.1 of the License, or (at your option)
012     any later version.
013     This library is distributed in the hope that it will be useful, but WITHOUT
014     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
015     FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
016     details.
017     You should have received a copy of the GNU Lesser General Public License
018     along with this library; if not, write to the Free Software Foundation, Inc.,
019     59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
020    
021     Contact information:
022    
023     lat/lon GmbH
024     Aennchenstr. 19, 53177 Bonn
025     Germany
026     http://lat-lon.de/
027    
028     Department of Geography, University of Bonn
029     Prof. Dr. Klaus Greve
030     Postfach 1147, 53001 Bonn
031     Germany
032     http://www.geographie.uni-bonn.de/deegree/
033    
034     e-mail: info@deegree.org
035     ----------------------------------------------------------------------------*/
036    
037    package org.deegree.enterprise.servlet;
038    
039    import java.io.File;
040    import java.io.IOException;
041    import java.io.OutputStream;
042    import java.io.RandomAccessFile;
043    import java.net.MalformedURLException;
044    import java.net.URL;
045    
046    import javax.servlet.ServletConfig;
047    import javax.servlet.ServletContext;
048    import javax.servlet.ServletException;
049    import javax.servlet.http.HttpServlet;
050    import javax.servlet.http.HttpServletRequest;
051    import javax.servlet.http.HttpServletResponse;
052    
053    import org.deegree.framework.log.ILogger;
054    import org.deegree.framework.log.LoggerFactory;
055    import org.deegree.framework.util.StringTools;
056    import org.deegree.portal.Constants;
057    
058    /**
059     * TODO add documentation here
060     * 
061     * @author <a href="mailto:elmasry@lat-lon.de">Moataz Elmasry</a>
062     * @author last edited by: $Author: jmays $
063     * 
064     * @version $Revision: 20729 $, $Date: 2009-11-11 16:36:59 +0100 (Mi, 11 Nov 2009) $
065     */
066    public class DownloadServlet extends HttpServlet {
067    
068        private static final long serialVersionUID = -1194881119569788359L;
069    
070        private static final ILogger LOG = LoggerFactory.getLogger( DownloadServlet.class );
071    
072        private String ipAddress = null;
073    
074        private String contentType = "application/zip";
075    
076        private String downloadDir = null;
077    
078        /*
079         * (non-Javadoc)
080         * 
081         * @see javax.servlet.GenericServlet#init(javax.servlet.ServletConfig)
082         */
083        @Override
084        public void init( ServletConfig config )
085                                throws ServletException {
086            super.init( config );
087            ipAddress = this.getInitParameter( "ALLOWED_IP_ADDRESS" );
088            downloadDir = this.getServletContext().getRealPath( this.getInitParameter( "DOWNLOAD_DIR" ) );
089            LOG.logDebug( "************ init download servlet ************" );
090            LOG.logDebug( "Download directory: ", downloadDir );
091            LOG.logDebug( "ipAddress: ", ipAddress );
092            LOG.logDebug( "contentType: ", contentType );
093        }
094    
095        /**
096         * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
097         * 
098         * @param request
099         *            servlet request
100         * @param response
101         *            servlet response
102         */
103        protected void processRequest( HttpServletRequest request, HttpServletResponse response )
104                                throws ServletException, IOException {
105            LOG.logDebug( "Starting to process request" );
106    
107            String addr = request.getRemoteAddr();
108            LOG.logDebug( "request.remoteAddr: ", addr );
109    
110            OutputStream os = response.getOutputStream();
111            String docPath = downloadDir;
112    
113            ServletContext sc = getServletContext();
114            if ( sc != null ) {
115                if ( sc.getAttribute( Constants.DOWNLOADDIR ) != null ) {
116                    docPath = (String) sc.getAttribute( Constants.DOWNLOADDIR );
117                }
118            }
119    
120            File fileDir;
121            try {
122                fileDir = new File( new URL( docPath ).getFile() );
123            } catch ( MalformedURLException e ) {
124                LOG.logDebug( "Download dir did not start with 'file', trying just as file now.", e );
125                fileDir = new File( docPath );
126            }
127            LOG.logDebug( "download directory (fileDir): ", fileDir.toString() );
128    
129            response.setContentType( contentType );
130    
131            RandomAccessFile raf = null;
132    
133            // TODO make sure the path exists, otherwise return an error.
134            try {
135                if ( ipAddress == null || ipAddress.equals( addr ) ) {
136                    String fileName = request.getParameter( "file" ).trim();
137                    LOG.logDebug( "zip file name= ", fileName );
138                    String filename = StringTools.concat( 100, "attachment;filename=\"", fileName, "\"" );
139                    response.addHeader( "Content-Disposition", filename );
140                    // response.setHeader( "Content-Disposition", filename );
141                    // read each file from the local file system
142                    File f = new File( fileDir, fileName );
143                    raf = new RandomAccessFile( f, "r" );
144                    // LOG.logDebug( "raf.name: " + f.toString() );
145                    long size = raf.length();
146                    byte[] b = new byte[(int) size];
147                    // reads the file to the byte array
148                    raf.read( b );
149    
150                    // write current byte array (file) to the output stream
151                    os.write( b );
152                    LOG.logDebug( "File is written successfully" );
153                } else {
154                    os.write( Messages.getString( "DownloadServlet.ERR_ACC_DENY" ).getBytes( "UTF-8" ) );
155                }
156            } catch ( Exception e ) {
157                LOG.logDebug( "catching error: ", e );
158                String message = org.deegree.i18n.Messages.get( "IGEO_STD_CNTXT_WRONG_PATH", fileDir.toString() );
159                os.write( message.getBytes( "UTF-8" ) );
160                os.write( e.toString().getBytes( "UTF-8" ) );
161            } finally {
162                try {
163                    raf.close();
164                    os.close();
165                } catch ( Exception e ) {
166                    LOG.logError( e.getMessage(), e );
167                }
168            }
169        }
170    
171        /*
172         * (non-Javadoc)
173         * 
174         * @see javax.servlet.http.HttpServlet#doGet(javax.servlet.http.HttpServletRequest,
175         * javax.servlet.http.HttpServletResponse)
176         */
177        @Override
178        protected void doGet( HttpServletRequest request, HttpServletResponse response )
179                                throws ServletException, IOException {
180            processRequest( request, response );
181        }
182    
183        /*
184         * (non-Javadoc)
185         * 
186         * @see javax.servlet.http.HttpServlet#doPost(javax.servlet.http.HttpServletRequest,
187         * javax.servlet.http.HttpServletResponse)
188         */
189        @Override
190        protected void doPost( HttpServletRequest request, HttpServletResponse response )
191                                throws ServletException, IOException {
192            processRequest( request, response );
193        }
194    
195        /*
196         * (non-Javadoc)
197         * 
198         * @see javax.servlet.GenericServlet#getServletInfo()
199         */
200        @Override
201        public String getServletInfo() {
202            return "Servlet for accessing documents assigned to a metadata entry";
203        }
204    
205    }