001/*
002 * This library is part of OpenCms -
003 * the Open Source Content Management System
004 *
005 * Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com)
006 *
007 * This library is free software; you can redistribute it and/or
008 * modify it under the terms of the GNU Lesser General Public
009 * License as published by the Free Software Foundation; either
010 * version 2.1 of the License, or (at your option) any later version.
011 *
012 * This library is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015 * Lesser General Public License for more details.
016 *
017 * For further information about Alkacon Software, please see the
018 * company website: http://www.alkacon.com
019 *
020 * For further information about OpenCms, please see the
021 * project website: http://www.opencms.org
022 *
023 * You should have received a copy of the GNU Lesser General Public
024 * License along with this library; if not, write to the Free Software
025 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
026 */
027
028package org.opencms.ui.components;
029
030import org.jsoup.Jsoup;
031import org.jsoup.nodes.Document;
032import org.jsoup.safety.Cleaner;
033import org.jsoup.safety.Safelist;
034
035import com.vaadin.ui.RichTextArea;
036
037/**
038 * Helper class for using rich text area in OpenCms.<p>
039 *
040 * <p>The client side implementation of this widget adds some special styles, see CmsRichTextAreaConnector
041 */
042public class CmsRichTextArea extends RichTextArea {
043
044    /**vaadin serial id. */
045    private static final long serialVersionUID = 1L;
046
047    /**CSS class name. */
048    private static final String CSS_CLASSNAME = "richopensans";
049
050    /**Style name. */
051    private String m_styleName = "";
052
053    /**
054     * Public constructor.<p>
055     */
056    public CmsRichTextArea() {
057
058        addStyleName("o-richtextarea-reduced");
059    }
060
061    /**
062     * Cleans up the given HTML such that only elements which can be normally entered in the widget are left.
063     *
064     * @param html the HTML
065     * @param allowLinks true if anchor elements / links  should be kept
066     *
067     * @return the cleaned up HTML
068     */
069    public static String cleanHtml(String html, boolean allowLinks) {
070
071        if (html == null) {
072            return null;
073        }
074        Safelist whitelist = new Safelist();
075        whitelist.addTags("font", "b", "span", "i", "strong", "br", "u", "ul", "ol", "li", "div");
076        whitelist.addAttributes("font", "size", "color", "face");
077        if (allowLinks) {
078            whitelist.addTags("a");
079            whitelist.addAttributes("a", "href");
080        }
081        Cleaner cleaner = new Cleaner(whitelist);
082        Document doc = Jsoup.parseBodyFragment(html);
083        Document cleaned = cleaner.clean(doc);
084        return cleaned.body().html();
085    }
086
087}