1   /**
2    * Copyright (c) 2000-2009 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.util.List;
35  
36  import org.jdom.IllegalDataException;
37  
38  /**
39   * <a href="RSSUtil.java.html"><b><i>View Source</i></b></a>
40   *
41   * @author Brian Wing Shun Chan
42   *
43   */
44  public class RSSUtil {
45  
46      public static final String RSS = "rss";
47  
48      public static final double[] RSS_VERSIONS = new double[] {
49          0.9, 0.91, 0.93, 0.94, 1.0, 2.0
50      };
51  
52      public static final String ATOM = "atom";
53  
54      public static final double[] ATOM_VERSIONS = new double[] {0.3, 1.0};
55  
56      public static final String DEFAULT_TYPE = ATOM;
57  
58      public static final double DEFAULT_VERSION = 1.0;
59  
60      public static final String DEFAULT_ENTRY_TYPE = "html";
61  
62      public static final String DEFAULT_FEED_TYPE = getFeedType(
63          DEFAULT_TYPE, DEFAULT_VERSION);
64  
65      public static final String DISPLAY_STYLE_ABSTRACT = "abstract";
66  
67      public static final String DISPLAY_STYLE_FULL_CONTENT = "full-content";
68  
69      public static final String DISPLAY_STYLE_TITLE = "title";
70  
71      public static String export(SyndFeed feed) throws FeedException {
72          feed.setEncoding(StringPool.UTF8);
73  
74          SyndFeedOutput output = new SyndFeedOutput();
75  
76          try {
77              return output.outputString(feed);
78          }
79          catch (IllegalDataException ide) {
80  
81              // LEP-4450
82  
83              _regexpStrip(feed);
84  
85              return output.outputString(feed);
86          }
87      }
88  
89      public static String getFeedType(String type, double version) {
90          return type + StringPool.UNDERLINE + version;
91      }
92  
93      private static void _regexpStrip(SyndFeed feed) {
94          feed.setTitle(_regexpStrip(feed.getTitle()));
95          feed.setDescription(_regexpStrip(feed.getDescription()));
96  
97          List<SyndEntry> entries = feed.getEntries();
98  
99          for (SyndEntry entry : entries) {
100             entry.setTitle(_regexpStrip(entry.getTitle()));
101 
102             SyndContent content = entry.getDescription();
103 
104             content.setValue(_regexpStrip(content.getValue()));
105         }
106     }
107 
108     private static String _regexpStrip(String text) {
109         text = Normalizer.normalizeToAscii(text);
110 
111         char[] array = text.toCharArray();
112 
113         for (int i = 0; i < array.length; i++) {
114             String s = String.valueOf(array[i]);
115 
116             if (!s.matches(_REGEXP_STRIP)) {
117                 array[i] = CharPool.SPACE;
118             }
119         }
120 
121         return new String(array);
122     }
123 
124     private static final String _REGEXP_STRIP = "[\\d\\w]";
125 
126 }