001    //$HeadURL: svn+ssh://jwilden@svn.wald.intevation.org/deegree/base/branches/2.5_testing/src/org/deegree/portal/wac/WACServlet.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    package org.deegree.portal.wac;
037    
038    import java.io.IOException;
039    import java.io.InputStream;
040    import java.io.OutputStream;
041    import java.io.PrintWriter;
042    import java.net.MalformedURLException;
043    import java.net.URL;
044    import java.util.Collections;
045    import java.util.HashMap;
046    import java.util.List;
047    import java.util.Map;
048    
049    import javax.servlet.ServletException;
050    import javax.servlet.http.HttpServlet;
051    import javax.servlet.http.HttpServletRequest;
052    import javax.servlet.http.HttpServletResponse;
053    
054    import org.deegree.framework.log.ILogger;
055    import org.deegree.framework.log.LoggerFactory;
056    import org.deegree.framework.util.KVP2Map;
057    import org.deegree.framework.util.StringTools;
058    import org.deegree.framework.xml.XMLFragment;
059    import org.deegree.model.metadata.iso19115.Linkage;
060    import org.deegree.model.metadata.iso19115.OnlineResource;
061    import org.deegree.ogcwebservices.InvalidParameterValueException;
062    import org.deegree.ogcwebservices.wms.XMLFactory;
063    import org.deegree.ogcwebservices.wms.capabilities.WMSCapabilities;
064    import org.deegree.ogcwebservices.wms.capabilities.WMSCapabilitiesDocument;
065    import org.deegree.ogcwebservices.wms.capabilities.WMSCapabilitiesDocumentFactory;
066    import org.deegree.owscommon_new.DCP;
067    import org.deegree.owscommon_new.HTTP;
068    import org.deegree.owscommon_new.Operation;
069    import org.deegree.owscommon_new.OperationsMetadata;
070    import org.w3c.dom.Document;
071    
072    /**
073     *
074     *
075     * @author <a href="mailto:poth@lat-lon.de">Andreas Poth </a>
076     * @author last edited by: $Author: mschneider $
077     *
078     * @version $Revision: 18195 $, $Date: 2009-06-18 17:55:39 +0200 (Do, 18 Jun 2009) $
079     */
080    public class WACServlet extends HttpServlet {
081    
082        /**
083         *
084         */
085        private static final long serialVersionUID = -4964542190148138040L;
086    
087        private Map<String, String> users = new HashMap<String, String>();
088    
089        private Map<String, String> passwords = new HashMap<String, String>();
090    
091        private Map<String, String> sessionIDs = Collections.synchronizedMap( new HashMap<String, String>() );
092    
093        private String host = null;
094    
095        private int port = 443;
096    
097        private String path = null;
098    
099        private String certificate = null;
100    
101        private String wacURL = null;
102    
103        private static final ILogger LOG = LoggerFactory.getLogger( WACServlet.class );
104    
105        @Override
106        public void init()
107                                throws ServletException {
108            super.init();
109            String user = getInitParameter( "USER" );
110            if ( user == null ) {
111                throw new ServletException( "user must be set!" );
112            }
113            users.put( "*", user );
114            String password = getInitParameter( "PASSWORD" );
115            if ( password == null ) {
116                throw new ServletException( "password must be set!" );
117            }
118            passwords.put( "*", password );
119            host = getInitParameter( "HOST" );
120            if ( host == null ) {
121                throw new ServletException( "WSS host must be set!" );
122            }
123            try {
124                port = Integer.parseInt( getInitParameter( "PORT" ) );
125            } catch ( NumberFormatException e ) {
126                getServletContext().log( "-> using default SSL port 443" );
127            }
128            path = getInitParameter( "PATH" );
129            if ( path == null ) {
130                throw new ServletException( "path to web application on host must be set!" );
131            }
132            certificate = getInitParameter( "CERTIFICATE" );
133            if ( certificate == null ) {
134                getServletContext().log( "no certificate defined" );
135            }
136    
137        }
138    
139        /**
140         * @param request
141         * @param response
142         * @throws IOException
143         */
144        @Override
145        protected void doGet( HttpServletRequest request, HttpServletResponse response )
146                                throws IOException {
147    
148            wacURL = "http://" + request.getServerName() + ":" + request.getServerPort() + request.getContextPath()
149                     + request.getServletPath();
150    
151            String user = users.get( "*" );
152            WAClient wac = new WAClient( host, path, port, certificate );
153            if ( sessionIDs.get( user ) == null ) {
154                if ( !accessSessionID( wac, response ) ) {
155                    return;
156                }
157            }
158            // get sessionID assigned to the user
159            String sessionID = sessionIDs.get( user );
160            InputStream is = null;
161            try {
162                StringBuffer sb = new StringBuffer( 2000 );
163                sb.append( request.getQueryString() ).append( "&sessionID=" ).append( sessionID );
164                is = wac.performDoService( request.getQueryString(), sessionID );
165            } catch ( Exception e ) {
166                e.printStackTrace();
167                sendException( response, "GetSession", "could not perform DoService", StringTools.stackTraceToString( e ) );
168            }
169    
170            OutputStream os = null;
171            try {
172                os = response.getOutputStream();
173                postProcess( request.getQueryString(), is, os );
174            } catch ( Exception e ) {
175                sendException( response, "GetSession", "could not post process capabilities",
176                               StringTools.stackTraceToString( e ) );
177            } finally {
178                os.flush();
179                os.close();
180                is.close();
181            }
182        }
183    
184        /**
185         * access a sessionID from a WSS and stores it into an internal Map to use for DoService calls
186         * against a WSS
187         *
188         * @param wac
189         * @param response
190         * @return true if a valid session id could be retrieved.
191         */
192        private boolean accessSessionID( WAClient wac, HttpServletResponse response ) {
193            String user = users.get( "*" );
194            String password = passwords.get( "*" );
195            try {
196                String sessionID = wac.performGetSession( user, password );
197                sessionIDs.put( user, sessionID );
198            } catch ( WACException e ) {
199                e.printStackTrace();
200                sendException( response, "GetSession", "could not perform GetSession", StringTools.stackTraceToString( e ) );
201                return false;
202            } catch ( Exception e ) {
203                e.printStackTrace();
204                sendException( response, "GetSession", "could not evaluate GetSession result",
205                               StringTools.stackTraceToString( e ) );
206                return false;
207            }
208            return true;
209        }
210    
211        private void sendException( HttpServletResponse response, String req, String message, String stacktrace ) {
212            this.getServletContext().log( message );
213            this.getServletContext().log( stacktrace );
214            response.setContentType( "text/xml" );
215            if ( req == null )
216                req = "";
217            if ( message == null )
218                message = "";
219            try {
220                PrintWriter pw = response.getWriter();
221                pw.write( "<OGCWebServiceException>" );
222                pw.write( "<Message>" );
223                pw.write( req );
224                pw.write( ": failed! " );
225                pw.write( message );
226                pw.write( "</Message>" );
227                pw.write( "<Locator>" );
228                pw.write( stacktrace );
229                pw.write( "</Locator>" );
230                pw.write( "</OGCWebServiceException>" );
231                pw.close();
232            } catch ( Exception ee ) {
233                ee.printStackTrace();
234            }
235        }
236    
237        /**
238         * forces a post processing of the wss response if a GetCapabilities request has been performed
239         * by replacing contained the online resources
240         *
241         * @param request
242         * @param is
243         * @param os
244         *            stream to write the result too
245         * @throws Exception
246         */
247        private void postProcess( String request, InputStream is, OutputStream os )
248                                throws Exception {
249            Map<String, String> map = KVP2Map.toMap( request );
250            if ( map.get( "REQUEST" ).equals( "GetCapabilities" ) ) {
251                XMLFragment xml = new XMLFragment();
252                xml.load( is, XMLFragment.DEFAULT_URL );
253                is.close();
254                Document doc = xml.getRootElement().getOwnerDocument();
255                if ( map.get( "SERVICE" ).equals( "WMS" ) ) {
256                    adjustWMSCapabilities( doc, os );
257                } else if ( map.get( "SERVICE" ).equals( "WFS" ) ) {
258                    // TODO
259                } else if ( map.get( "SERVICE" ).equals( "WCS" ) ) {
260                    // TODO
261                } else if ( map.get( "SERVICE" ).equals( "CSW" ) ) {
262                    // TODO
263                } else if ( map.get( "SERVICE" ).equals( "SCS" ) ) {
264                    // TODO
265                }
266                if ( map.get( "SERVICE" ).equals( "WFS-G" ) ) {
267                    // TODO
268                }
269                if ( map.get( "SERVICE" ).equals( "WTS" ) ) {
270                    // TODO
271                }
272            } else {
273                byte[] b = new byte[1024];
274                int c = 0;
275                while ( ( c = is.read( b ) ) > 0 ) {
276                    os.write( b, 0, c );
277                }
278                os.close();
279                is.close();
280            }
281        }
282    
283        /**
284         * adjusts the passed WMS capabilities document by replacing the contained online resources with
285         * the address of the WAC
286         * @param doc
287         * @param os
288         * @throws InvalidParameterValueException
289         */
290        private void adjustWMSCapabilities( Document doc, OutputStream os )
291                                throws InvalidParameterValueException, IOException {
292    
293            WMSCapabilities capa = null;
294            try {
295                WMSCapabilitiesDocument cdoc = WMSCapabilitiesDocumentFactory.getWMSCapabilitiesDocument( doc.getDocumentElement() );
296                capa = (WMSCapabilities) cdoc.parseCapabilities();
297            } catch ( Exception e ) {
298                e.printStackTrace();
299                throw new InvalidParameterValueException( "no valid wms capabilities\n"
300                                                          + StringTools.stackTraceToString( e ) );
301            }
302    
303            OperationsMetadata om = capa.getOperationMetadata();
304    
305            List<Operation> ops = om.getOperations();
306            for ( Operation operation : ops ) {
307                setNewOnlineResource( operation );
308            }
309    
310            WMSCapabilitiesDocument cdoc = XMLFactory.export( capa );
311            cdoc.write( os );
312        }
313    
314        /**
315         * sets a new online resource for the passed <tt>Operation</tt>
316         *
317         * @param op
318         */
319        private void setNewOnlineResource( Operation op ) {
320            List<DCP> dcps = op.getDCP();
321            if ( dcps != null ) {
322                for ( DCP dcp : dcps ) {
323                    HTTP http = (HTTP) dcp;
324                    try {
325                        URL url = new URL( wacURL );
326                        OnlineResource link = new OnlineResource( new Linkage( url ) );
327                        List<OnlineResource> resources = http.getLinks();
328                        int size = resources.size();
329                        resources.clear();
330                        for ( int i = 0; i < size; ++i )
331                            resources.add( link );
332                    } catch ( MalformedURLException e1 ) {
333                        LOG.logError( e1.getLocalizedMessage(), e1 );
334                    }
335                }
336            }
337        }
338    
339        /**
340         * @param request
341         * @param response
342         * @throws ServletException
343         * @throws IOException
344         */
345        @Override
346        protected void doPost( HttpServletRequest request, HttpServletResponse response )
347                                throws ServletException, IOException {
348            doGet( request, response );
349        }
350    
351    }