001: /* ====================================================================
002: * The Jcorporate Apache Style Software License, Version 1.2 05-07-2002
003: *
004: * Copyright (c) 1995-2002 Jcorporate Ltd. All rights reserved.
005: *
006: * Redistribution and use in source and binary forms, with or without
007: * modification, are permitted provided that the following conditions
008: * are met:
009: *
010: * 1. Redistributions of source code must retain the above copyright
011: * notice, this list of conditions and the following disclaimer.
012: *
013: * 2. Redistributions in binary form must reproduce the above copyright
014: * notice, this list of conditions and the following disclaimer in
015: * the documentation and/or other materials provided with the
016: * distribution.
017: *
018: * 3. The end-user documentation included with the redistribution,
019: * if any, must include the following acknowledgment:
020: * "This product includes software developed by Jcorporate Ltd.
021: * (http://www.jcorporate.com/)."
022: * Alternately, this acknowledgment may appear in the software itself,
023: * if and wherever such third-party acknowledgments normally appear.
024: *
025: * 4. "Jcorporate" and product names such as "Expresso" must
026: * not be used to endorse or promote products derived from this
027: * software without prior written permission. For written permission,
028: * please contact info@jcorporate.com.
029: *
030: * 5. Products derived from this software may not be called "Expresso",
031: * or other Jcorporate product names; nor may "Expresso" or other
032: * Jcorporate product names appear in their name, without prior
033: * written permission of Jcorporate Ltd.
034: *
035: * 6. No product derived from this software may compete in the same
036: * market space, i.e. framework, without prior written permission
037: * of Jcorporate Ltd. For written permission, please contact
038: * partners@jcorporate.com.
039: *
040: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
041: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
042: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
043: * DISCLAIMED. IN NO EVENT SHALL JCORPORATE LTD OR ITS CONTRIBUTORS
044: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
045: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
046: * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
047: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
048: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
049: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
050: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
051: * SUCH DAMAGE.
052: * ====================================================================
053: *
054: * This software consists of voluntary contributions made by many
055: * individuals on behalf of the Jcorporate Ltd. Contributions back
056: * to the project(s) are encouraged when you make modifications.
057: * Please send them to support@jcorporate.com. For more information
058: * on Jcorporate Ltd. and its products, please see
059: * <http://www.jcorporate.com/>.
060: *
061: * Portions of this software are based upon other open source
062: * products and are subject to their respective licenses.
063: */
064:
065: package com.jcorporate.expresso.core.security.filters;
066:
067: /**
068: * This class provides a filter implementation for HTML output, protecting against
069: * XSS exploits, but allows a small subset of HTML through, for simple formatting.
070: * It also creates anchor (<a>) tags for anything that starts with 'http://', 'www.', etc.
071: *
072: * @author Patricia Schank
073: */
074: public class AllowedHtmlPlusURLFilter extends HtmlPlusURLFilter {
075:
076: public static final String[] ALLOWED_HTML = { "<b>", "</b>", "<i>",
077: "</i>", "<em>", "</em>", "<strong>", "</strong>",
078: "<blockquote>", "</blockquote>", "<ol>", "</ol>", "<ul>",
079: "</ul>", "<li>", "</li>" };
080:
081: /**
082: * No-arg constructor required
083: * Just append special html filtering string list with allowed html
084: */
085: public AllowedHtmlPlusURLFilter() throws IllegalArgumentException {
086: super (appendArrays(SPECIAL_STRING_LIST, ALLOWED_HTML),
087: appendArrays(REPLACE_LIST, ALLOWED_HTML));
088: }
089:
090: private static String[] appendArrays(String[] array1,
091: String[] array2) {
092: if (array1 == null || array2 == null) {
093: return null;
094: }
095:
096: int totalLength = array1.length + array2.length;
097: String resultArray[] = new String[totalLength];
098: for (int i = 0; i < array1.length; i++) {
099: resultArray[i] = array1[i];
100: }
101: for (int i = 0; i < array2.length; i++) {
102: resultArray[array1.length + i] = array2[i];
103: }
104: return resultArray;
105: }
106: }
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