001/*
002 * (C) Copyright 2006-2010 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     Florent Guillaume
018 */
019package org.nuxeo.ecm.platform.htmlsanitizer;
020
021import org.nuxeo.ecm.core.api.DocumentModel;
022import org.nuxeo.ecm.core.api.event.DocumentEventTypes;
023import org.nuxeo.ecm.core.event.Event;
024import org.nuxeo.ecm.core.event.EventContext;
025import org.nuxeo.ecm.core.event.EventListener;
026import org.nuxeo.ecm.core.event.impl.DocumentEventContext;
027import org.nuxeo.ecm.core.schema.FacetNames;
028import org.nuxeo.runtime.api.Framework;
029
030/**
031 * Listener that sanitizes some HTML fields to remove potential cross-site scripting attacks in them.
032 */
033public class HtmlSanitizerListener implements EventListener {
034
035    public static final String DISABLE_HTMLSANITIZER_LISTENER = "disableHtmlSanitizerListener";
036
037    @Override
038    public void handleEvent(Event event) {
039        String eventId = event.getName();
040        if (!eventId.equals(DocumentEventTypes.ABOUT_TO_CREATE)
041                && !eventId.equals(DocumentEventTypes.BEFORE_DOC_UPDATE)) {
042            return;
043        }
044        EventContext context = event.getContext();
045        if (!(context instanceof DocumentEventContext)) {
046            return;
047        }
048        Boolean disableListener = (Boolean) context.getProperty(DISABLE_HTMLSANITIZER_LISTENER);
049        if (Boolean.TRUE.equals(disableListener)) {
050            return;
051        }
052
053        DocumentModel doc = ((DocumentEventContext) context).getSourceDocument();
054        if (doc.hasFacet(FacetNames.IMMUTABLE)) {
055            return;
056        }
057        HtmlSanitizerService sanitizer = Framework.getService(HtmlSanitizerService.class);
058        sanitizer.sanitizeDocument(doc);
059    }
060
061}