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Java > Open Source Codes > org > apache > tomcat > util > http > HttpMessages


1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements. See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License. You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17
18 package org.apache.tomcat.util.http;
19
20 import org.apache.tomcat.util.res.StringManager;
21
22 /**
23  * Handle (internationalized) HTTP messages.
24  *
25  * @author James Duncan Davidson [duncan@eng.sun.com]
26  * @author James Todd [gonzo@eng.sun.com]
27  * @author Jason Hunter [jch@eng.sun.com]
28  * @author Harish Prabandham
29  * @author costin@eng.sun.com
30  */
31 public class HttpMessages {
32     // XXX move message resources in this package
33 protected static StringManager sm =
34         StringManager.getManager("org.apache.tomcat.util.http.res");
35     
36     static String JavaDoc st_200=null;
37     static String JavaDoc st_302=null;
38     static String JavaDoc st_400=null;
39     static String JavaDoc st_404=null;
40     
41     /** Get the status string associated with a status code.
42      * No I18N - return the messages defined in the HTTP spec.
43      * ( the user isn't supposed to see them, this is the last
44      * thing to translate)
45      *
46      * Common messages are cached.
47      *
48      */
49     public static String JavaDoc getMessage( int status ) {
50     // method from Response.
51
52     // Does HTTP requires/allow international messages or
53 // are pre-defined? The user doesn't see them most of the time
54 switch( status ) {
55     case 200:
56         if( st_200==null ) st_200=sm.getString( "sc.200");
57         return st_200;
58     case 302:
59         if( st_302==null ) st_302=sm.getString( "sc.302");
60         return st_302;
61     case 400:
62         if( st_400==null ) st_400=sm.getString( "sc.400");
63         return st_400;
64     case 404:
65         if( st_404==null ) st_404=sm.getString( "sc.404");
66         return st_404;
67     }
68     return sm.getString("sc."+ status);
69     }
70
71     /**
72      * Filter the specified message string for characters that are sensitive
73      * in HTML. This avoids potential attacks caused by including JavaScript
74      * codes in the request URL that is often reported in error messages.
75      *
76      * @param message The message string to be filtered
77      */
78     public static String JavaDoc filter(String JavaDoc message) {
79
80     if (message == null)
81         return (null);
82
83     char content[] = new char[message.length()];
84     message.getChars(0, message.length(), content, 0);
85     StringBuffer JavaDoc result = new StringBuffer JavaDoc(content.length + 50);
86     for (int i = 0; i < content.length; i++) {
87         switch (content[i]) {
88         case '<':
89         result.append("&lt;");
90         break;
91         case '>':
92         result.append("&gt;");
93         break;
94         case '&':
95         result.append("&amp;");
96         break;
97         case '"':
98         result.append("&quot;");
99         break;
100         default:
101         result.append(content[i]);
102         }
103     }
104     return (result.toString());
105     }
106
107 }
108
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