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1   /*
2    * $Id: PropertiesUtils.java 7976 2007-08-21 14:26:13Z dirk.olmes $
3    * --------------------------------------------------------------------------------------
4    * Copyright (c) MuleSource, Inc.  All rights reserved.  http://www.mulesource.com
5    *
6    * The software in this package is published under the terms of the CPAL v1.0
7    * license, a copy of which has been included with this distribution in the
8    * LICENSE.txt file.
9    */
10  
11  package org.mule.util;
12  
13  import org.mule.config.i18n.CoreMessages;
14  import org.mule.config.i18n.Message;
15  
16  import java.io.IOException;
17  import java.io.InputStream;
18  import java.util.HashMap;
19  import java.util.Iterator;
20  import java.util.List;
21  import java.util.Map;
22  import java.util.Properties;
23  
24  import edu.emory.mathcs.backport.java.util.concurrent.CopyOnWriteArrayList;
25  
26  /**
27   * <code>PropertiesHelper</code> is a utility class for manipulating and filtering
28   * property Maps.
29   */
30  // @ThreadSafe
31  public final class PropertiesUtils
32  {
33      // @GuardedBy(itself)
34      private static final List maskedProperties = new CopyOnWriteArrayList();
35  
36      static
37      {
38          // When printing property lists mask password fields
39          // Users can register their own fields to mask
40          registerMaskedPropertyName("password");
41      }
42  
43      /** Do not instanciate. */
44      protected PropertiesUtils ()
45      {
46          // no-op
47      }
48  
49      /**
50       * Register a property name for masking. This will prevent certain values from
51       * leaking e.g. into debugging output or logfiles.
52       * 
53       * @param name the key of the property to be masked.
54       * @throws IllegalArgumentException is name is null or empty.
55       */
56      public static void registerMaskedPropertyName(String name)
57      {
58          if (StringUtils.isNotEmpty(name))
59          {
60              maskedProperties.add(name);
61          }
62          else
63          {
64              throw new IllegalArgumentException("Cannot mask empty property name.");
65          }
66      }
67  
68      /**
69       * Returns the String representation of the property value or a masked String if
70       * the property key has been registered previously via
71       * {@link #registerMaskedPropertyName(String)}.
72       * 
73       * @param property a key/value pair
74       * @return String of the property value or a "masked" String that hides the
75       *         contents, or <code>null</code> if the property, its key or its value
76       *         is <code>null</code>.
77       */
78      public static String maskedPropertyValue(Map.Entry property)
79      {
80          if (property == null)
81          {
82              return null;
83          }
84  
85          Object key = property.getKey();
86          Object value = property.getValue();
87  
88          if (key == null || value == null)
89          {
90              return null;
91          }
92  
93          if (maskedProperties.contains(key))
94          {
95              return ("*****");
96          }
97          else
98          {
99              return value.toString();
100         }
101     }
102 
103     /**
104      * Read in the properties from a properties file. The file may be on the file
105      * system or the classpath.
106      * 
107      * @param fileName - The name of the properties file
108      * @param callingClass - The Class which is calling this method. This is used to
109      *            determine the classpath.
110      * @return a java.util.Properties object containing the properties.
111      */
112     public static synchronized Properties loadProperties(String fileName, final Class callingClass)
113         throws IOException
114     {
115         InputStream is = IOUtils.getResourceAsStream(fileName, callingClass,
116         /* tryAsFile */true, /* tryAsUrl */false);
117         if (is == null)
118         {
119             Message error = CoreMessages.cannotLoadFromClasspath(fileName);
120             throw new IOException(error.toString());
121         }
122 
123         try
124         {
125             Properties props = new Properties();
126             props.load(is);
127             return props;
128         }
129         finally
130         {
131             is.close();
132         }
133     }
134 
135     public static String removeXmlNamespacePrefix(String eleName)
136     {
137         int i = eleName.indexOf(':');
138         return (i == -1 ? eleName : eleName.substring(i + 1, eleName.length()));
139     }
140 
141     public static String removeNamespacePrefix(String eleName)
142     {
143         int i = eleName.lastIndexOf('.');
144         return (i == -1 ? eleName : eleName.substring(i + 1, eleName.length()));
145     }
146 
147     public static Map removeNamespaces(Map properties)
148     {
149         HashMap props = new HashMap(properties.size());
150         Map.Entry entry;
151         for (Iterator iter = properties.entrySet().iterator(); iter.hasNext();)
152         {
153             entry = (Map.Entry) iter.next();
154             props.put(removeNamespacePrefix((String) entry.getKey()), entry.getValue());
155 
156         }
157         return props;
158     }
159 
160     /**
161      * Will create a map of properties where the names have a prefix Allows the
162      * callee to supply the target map so a comarator can be set
163      * 
164      * @param props the source set of properties
165      * @param prefix the prefix to filter on
166      * @param newProps return map containing the filtered list of properties or an
167      *            empty map if no properties matched the prefix
168      */
169     public static void getPropertiesWithPrefix(Map props, String prefix, Map newProps)
170     {
171         for (Iterator iterator = props.entrySet().iterator(); iterator.hasNext();)
172         {
173             Map.Entry entry = (Map.Entry) iterator.next();
174             Object key = entry.getKey();
175             if (key.toString().startsWith(prefix))
176             {
177                 newProps.put(key, entry.getValue());
178             }
179         }
180     }
181 
182     public static Map getPropertiesWithoutPrefix(Map props, String prefix)
183     {
184         Map newProps = new HashMap();
185         for (Iterator iterator = props.entrySet().iterator(); iterator.hasNext();)
186         {
187             Map.Entry entry = (Map.Entry) iterator.next();
188             Object key = entry.getKey();
189             if (!key.toString().startsWith(prefix))
190             {
191                 newProps.put(key, entry.getValue());
192             }
193         }
194         return newProps;
195     }
196 
197     public static Properties getPropertiesFromQueryString(String query)
198     {
199         Properties props = new Properties();
200 
201         if (query == null)
202         {
203             return props;
204         }
205 
206         query = new StringBuffer(query.length() + 1).append('&').append(query).toString();
207 
208         int x = 0;
209         while ((x = addProperty(query, x, props)) != -1)
210         {
211             // run
212         }
213 
214         return props;
215     }
216 
217     private static int addProperty(String query, int start, Properties properties)
218     {
219         int i = query.indexOf('&', start);
220         int i2 = query.indexOf('&', i + 1);
221         String pair;
222         if (i > -1 && i2 > -1)
223         {
224             pair = query.substring(i + 1, i2);
225         }
226         else if (i > -1)
227         {
228             pair = query.substring(i + 1);
229         }
230         else
231         {
232             return -1;
233         }
234         int eq = pair.indexOf('=');
235 
236         if (eq <= 0)
237         {
238             String key = pair;
239             String value = StringUtils.EMPTY;
240             properties.setProperty(key, value);
241         }
242         else
243         {
244             String key = pair.substring(0, eq);
245             String value = (eq == pair.length() ? StringUtils.EMPTY : pair.substring(eq + 1));
246             properties.setProperty(key, value);
247         }
248         return i2;
249     }
250 
251     /**
252      * @deprecated Use {@link MapUtils#toString(Map, boolean)} instead
253      */
254     public static String propertiesToString(Map props, boolean newline)
255     {
256         return MapUtils.toString(props, newline);
257     }
258 
259 }