1   /**
2    * Copyright (c) 2000-2008 Liferay, Inc. All rights reserved.
3    *
4    * Permission is hereby granted, free of charge, to any person obtaining a copy
5    * of this software and associated documentation files (the "Software"), to deal
6    * in the Software without restriction, including without limitation the rights
7    * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8    * copies of the Software, and to permit persons to whom the Software is
9    * furnished to do so, subject to the following conditions:
10   *
11   * The above copyright notice and this permission notice shall be included in
12   * all copies or substantial portions of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.util;
24  
25  import com.liferay.portal.kernel.util.CharPool;
26  import com.liferay.portal.kernel.util.StringPool;
27  
28  import com.sun.syndication.feed.synd.SyndContent;
29  import com.sun.syndication.feed.synd.SyndEntry;
30  import com.sun.syndication.feed.synd.SyndFeed;
31  import com.sun.syndication.io.FeedException;
32  import com.sun.syndication.io.SyndFeedOutput;
33  
34  import java.io.IOException;
35  
36  import java.util.List;
37  
38  import org.jdom.IllegalDataException;
39  
40  /**
41   * <a href="RSSUtil.java.html"><b><i>View Source</i></b></a>
42   *
43   * @author Brian Wing Shun Chan
44   *
45   */
46  public class RSSUtil {
47  
48      public static final String RSS = "rss";
49  
50      public static final double[] RSS_VERSIONS = new double[] {
51          0.9, 0.91, 0.93, 0.94, 1.0, 2.0
52      };
53  
54      public static final String ATOM = "atom";
55  
56      public static final double[] ATOM_VERSIONS = new double[] {0.3, 1.0};
57  
58      public static final String DEFAULT_TYPE = ATOM;
59  
60      public static final double DEFAULT_VERSION = 1.0;
61  
62      public static final String DEFAULT_ENTRY_TYPE = "html";
63  
64      public static final String DEFAULT_FEED_TYPE = getFeedType(
65          DEFAULT_TYPE, DEFAULT_VERSION);
66  
67      public static final String DISPLAY_STYLE_ABSTRACT = "abstract";
68  
69      public static final String DISPLAY_STYLE_FULL_CONTENT = "full-content";
70  
71      public static final String DISPLAY_STYLE_TITLE = "title";
72  
73      public static String export(SyndFeed feed)
74          throws FeedException, IOException {
75  
76          feed.setEncoding(StringPool.UTF8);
77  
78          SyndFeedOutput output = new SyndFeedOutput();
79  
80          try {
81              return output.outputString(feed);
82          }
83          catch (IllegalDataException ide) {
84  
85              // LEP-4450
86  
87              _regexpStrip(feed);
88  
89              return output.outputString(feed);
90          }
91      }
92  
93      public static String getFeedType(String type, double version) {
94          return type + StringPool.UNDERLINE + version;
95      }
96  
97      private static void _regexpStrip(SyndFeed feed) {
98          feed.setTitle(_regexpStrip(feed.getTitle()));
99          feed.setDescription(_regexpStrip(feed.getDescription()));
100 
101         List<SyndEntry> entries = feed.getEntries();
102 
103         for (SyndEntry entry : entries) {
104             entry.setTitle(_regexpStrip(entry.getTitle()));
105 
106             SyndContent content = entry.getDescription();
107 
108             content.setValue(_regexpStrip(content.getValue()));
109         }
110     }
111 
112     private static String _regexpStrip(String text) {
113         text = Normalizer.normalizeToAscii(text);
114 
115         char[] array = text.toCharArray();
116 
117         for (int i = 0; i < array.length; i++) {
118             String s = String.valueOf(array[i]);
119 
120             if (!s.matches(_REGEXP_STRIP)) {
121                 array[i] = CharPool.SPACE;
122             }
123         }
124 
125         return new String(array);
126     }
127 
128     private static final String _REGEXP_STRIP = "[\\d\\w]";
129 
130 }