    001    //$HeadURL: https://svn.wald.intevation.org/svn/deegree/base/branches/2.4_testing/src/org/deegree/security/owsrequestvalidator/wfs/GetFeatureResponseValidator.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.security.owsrequestvalidator.wfs;
    037
    038    import java.io.ByteArrayInputStream;
    039    import java.io.ObjectInputStream;
    040
    041    import org.deegree.framework.util.MimeTypeMapper;
    042    import org.deegree.i18n.Messages;
    043    import org.deegree.model.feature.FeatureCollection;
    044    import org.deegree.ogcwebservices.InvalidParameterValueException;
    045    import org.deegree.ogcwebservices.OGCWebServiceRequest;
    046    import org.deegree.security.drm.model.User;
    047    import org.deegree.security.owsproxy.Request;
    048    import org.deegree.security.owsrequestvalidator.Policy;
    049    import org.deegree.security.owsrequestvalidator.ResponseValidator;
    050    import org.deegree.security.owsrequestvalidator.wms.GetMapRequestValidator;
    051
    052    /**
    053     *
    054     * @author <a href="mailto:poth@lat-lon.de">Andreas Poth </a>
    055     * @author last edited by: $Author: mschneider $
    056     *
    057     * @version $Revision: 18195 $, $Date: 2009-06-18 17:55:39 +0200 (Do, 18. Jun 2009) $
    058     */
    059    class GetFeatureResponseValidator extends ResponseValidator {
    060
    061        /**
    062         * @param policy
    063         */
    064        public GetFeatureResponseValidator( Policy policy ) {
    065            super( policy );
    066        }
    067
    068        /**
    069         * validates the passed object as a response to a OWS request. The validity of the response may
    070         * is assigned to specific user rights. If the passed user is <>null this will be evaluated.
    071         * <br>
    072         * the reponse may contain three valid kinds of objects:
    073         * <ul>
    074         * <li>a xml encoded exception
    075         * <li>a GML document
    076         * <li>a XML document
    077         * <li>a serialized deegree FeatureCollection
    078         * <li>any other kind of document that is valid against the formats defined for GetFeature in
    079         * the capabilities
    080         * </ul>
    081         * Each of these types can be identified by the mime-type of the response that is also passed to
    082         * the method. <br>
    083         * If something basic went wrong it is possible that not further specified kind of object is
    084         * passed as response. In this case the method will throw an
    085         * <tt>InvalidParameterValueException</tt> to avoid sending bad responses to the client.
    086         *
    087         * @param service
    088         *            service which produced the response (WMS, WFS ...)
    089         * @param response
    090         * @param mime
    091         *            mime-type of the response
    092         * @param user
    093         * @return the validated response.
    094         * @throws InvalidParameterValueException
    095         * @see GetMapRequestValidator#validateRequest(OGCWebServiceRequest, User)
    096         */
    097        @Override
    098        public byte[] validateResponse( String service, byte[] response, String mime, User user )
    099                                throws InvalidParameterValueException {
    100
    101            Request req = policy.getRequest( service, "GetFeature" );
    102            // request is valid because no restrictions are made
    103            if ( req.isAny() || req.getPostConditions().isAny() ) {
    104                return response;
    105            }
    106
    107            // Condition condition = req.getPostConditions();
    108
    109            if ( MimeTypeMapper.isKnownOGCType( mime ) ) {
    110                // if the mime-type isn't an image type but a known
    111                // OGC mime-type it must be an XML document.
    112                // probably it is an exception but it also could be
    113                // a GML document
    114                response = validateXML( response, mime, user );
    115            } else if ( mime.equals( "text/xml" ) ) {
    116                // if the mime-type isn't an image type but 'text/xml'
    117                // it could be an exception
    118                response = validateXML( response, mime, user );
    119            } else if ( mime.equals( "application/octet-stream" ) ) {
    120                response = validateBinaryResult( response, user );
    121            } else {
    122                throw new InvalidParameterValueException( UNKNOWNMIMETYPE + mime );
    123            }
    124
    125            return response;
    126        }
    127
    128        /**
    129         * validates the passed byte array to be valid against the policy
    130         *
    131         * @param xml
    132         * @param mime
    133         * @param user
    134         */
    135        private byte[] validateXML( byte[] xml, String mime, User user ) {
    136            // TODO
    137            // define useful post-validation for xml-documents
    138            // at the moment everything is valid
    139            return xml;
    140        }
    141
    142        /**
    143         * validates the passed byte array to be valid against the policy. At the moment just a
    144         * org.deegree.model.feature.FeatureCollection is a valid response if mime type is
    145         * application/octet-stream. This may be enhanced in future versions.
    146         *
    147         * @param object
    148         * @param user
    149         * @throws InvalidParameterValueException
    150         */
    151        private byte[] validateBinaryResult( byte[] object, User user )
    152                                throws InvalidParameterValueException {
    153            try {
    154                ByteArrayInputStream bis = new ByteArrayInputStream( object );
    155                ObjectInputStream ois = new ObjectInputStream( bis );
    156                Object obj = ois.readObject();
    157
    158                if ( !( obj instanceof FeatureCollection ) ) {
    159                    String s = Messages.getMessage( "OWSPROXY_INVALID_GETFEATURE_RESPONSETYPE" );
    160                    throw new InvalidParameterValueException( s );
    161                }
    162            } catch ( Exception e ) {
    163                throw new InvalidParameterValueException( e );
    164            }
    165
    166            return object;
    167        }
    168    }