| Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
| NoFollowDecorator |
|
| 3.0;3 |
| 1 | /* | |
| 2 | * Copyright (c) 2003-2011, Simon Brown | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * Redistribution and use in source and binary forms, with or without | |
| 6 | * modification, are permitted provided that the following conditions are met: | |
| 7 | * | |
| 8 | * - Redistributions of source code must retain the above copyright | |
| 9 | * notice, this list of conditions and the following disclaimer. | |
| 10 | * | |
| 11 | * - Redistributions in binary form must reproduce the above copyright | |
| 12 | * notice, this list of conditions and the following disclaimer in | |
| 13 | * the documentation and/or other materials provided with the | |
| 14 | * distribution. | |
| 15 | * | |
| 16 | * - Neither the name of Pebble nor the names of its contributors may | |
| 17 | * be used to endorse or promote products derived from this software | |
| 18 | * without specific prior written permission. | |
| 19 | * | |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
| 21 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
| 24 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
| 25 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
| 26 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
| 27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
| 28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 29 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
| 30 | * POSSIBILITY OF SUCH DAMAGE. | |
| 31 | */ | |
| 32 | ||
| 33 | package net.sourceforge.pebble.decorator; | |
| 34 | ||
| 35 | import net.sourceforge.pebble.api.decorator.ContentDecoratorContext; | |
| 36 | import net.sourceforge.pebble.domain.Comment; | |
| 37 | import net.sourceforge.pebble.domain.TrackBack; | |
| 38 | ||
| 39 | import java.util.regex.Matcher; | |
| 40 | import java.util.regex.Pattern; | |
| 41 | ||
| 42 | /** | |
| 43 | * Adds a rel="nofollow" attribute into all links within comment | |
| 44 | * and TrackBack content. | |
| 45 | * | |
| 46 | * @author Simon Brown | |
| 47 | */ | |
| 48 | 8 | public class NoFollowDecorator extends ContentDecoratorSupport { |
| 49 | ||
| 50 | /** the regex used to find HTML links */ | |
| 51 | 4 | private static Pattern HTML_LINK_PATTERN = Pattern.compile("<a.*?href=.*?>", Pattern.CASE_INSENSITIVE); |
| 52 | ||
| 53 | /** | |
| 54 | * Decorates the specified comment. | |
| 55 | * | |
| 56 | * @param context the context in which the decoration is running | |
| 57 | * @param comment the comment to be decorated | |
| 58 | */ | |
| 59 | public void decorate(ContentDecoratorContext context, Comment comment) { | |
| 60 | 80 | comment.setBody(addNoFollowLinks(comment.getBody())); |
| 61 | 80 | } |
| 62 | ||
| 63 | /** | |
| 64 | * Decorates the specified TrackBack. | |
| 65 | * | |
| 66 | * @param context the context in which the decoration is running | |
| 67 | * @param trackBack the TrackBack to be decorated | |
| 68 | */ | |
| 69 | public void decorate(ContentDecoratorContext context, TrackBack trackBack) { | |
| 70 | 16 | trackBack.setExcerpt(addNoFollowLinks(trackBack.getExcerpt())); |
| 71 | 16 | } |
| 72 | ||
| 73 | /** | |
| 74 | * Adds rel="nofollow" links too any links in the specified string. | |
| 75 | * | |
| 76 | * @param html a String containing HTML | |
| 77 | * @return the same String with rel="nofollow" in anchor tags | |
| 78 | */ | |
| 79 | private String addNoFollowLinks(String html) { | |
| 80 | 96 | if (html == null || html.length() == 0) { |
| 81 | 0 | return html; |
| 82 | } | |
| 83 | ||
| 84 | 96 | Matcher m = HTML_LINK_PATTERN.matcher(html); |
| 85 | 96 | StringBuffer buf = new StringBuffer(); |
| 86 | ||
| 87 | 160 | while (m.find()) { |
| 88 | 64 | int start = m.start(); |
| 89 | 64 | int end = m.end(); |
| 90 | ||
| 91 | 64 | String link = html.substring(start, end); |
| 92 | 64 | buf.append(html.substring(0, start)); |
| 93 | ||
| 94 | // add the nofollow, if necessary | |
| 95 | 64 | int startOfRelIndex = link.indexOf("rel=\""); |
| 96 | 64 | if (startOfRelIndex == -1) { |
| 97 | // no rel link, add one | |
| 98 | 48 | buf.append(link.substring(0, link.length() - 1)); |
| 99 | 48 | buf.append(" rel=\"nofollow\">"); |
| 100 | } else { | |
| 101 | 16 | int endOfRelIndex = link.indexOf("\"", startOfRelIndex+5); |
| 102 | 16 | String rel = link.substring(startOfRelIndex+5, endOfRelIndex); |
| 103 | 16 | rel = rel.toLowerCase(); |
| 104 | 16 | if (rel.indexOf("nofollow") == -1) { |
| 105 | // rel exists, but without nofollow | |
| 106 | 8 | buf.append(link.substring(0, endOfRelIndex)); |
| 107 | 8 | buf.append(" nofollow"); |
| 108 | 8 | buf.append(link.substring(endOfRelIndex)); |
| 109 | } else { | |
| 110 | // nofollow exists | |
| 111 | 8 | buf.append(link); |
| 112 | } | |
| 113 | } | |
| 114 | ||
| 115 | 64 | html = html.substring(end, html.length()); |
| 116 | 64 | m = HTML_LINK_PATTERN.matcher(html); |
| 117 | 64 | } |
| 118 | ||
| 119 | 96 | buf.append(html); |
| 120 | ||
| 121 | 96 | return buf.toString(); |
| 122 | } | |
| 123 | ||
| 124 | } |