1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.tomcat.util.http;
import org.apache.tomcat.util.res.StringManager;
/**
* Handle (internationalized) HTTP messages.
*
* @author James Duncan Davidson [duncan@eng.sun.com]
* @author James Todd [gonzo@eng.sun.com]
* @author Jason Hunter [jch@eng.sun.com]
* @author Harish Prabandham
* @author costin@eng.sun.com
*/
public class HttpMessages {
// XXX move message resources in this package
protected static StringManager sm =
StringManager.getManager("org.apache.tomcat.util.http.res");
static String st_200=null;
static String st_302=null;
static String st_400=null;
static String st_404=null;
/** Get the status string associated with a status code.
* No I18N - return the messages defined in the HTTP spec.
* ( the user isn't supposed to see them, this is the last
* thing to translate)
*
* Common messages are cached.
*
*/
public static String getMessage( int status ) {
// method from Response.
// Does HTTP requires/allow international messages or
// are pre-defined? The user doesn't see them most of the time
switch( status ) {
case 200:
if( st_200==null ) st_200=sm.getString( "sc.200");
return st_200;
case 302:
if( st_302==null ) st_302=sm.getString( "sc.302");
return st_302;
case 400:
if( st_400==null ) st_400=sm.getString( "sc.400");
return st_400;
case 404:
if( st_404==null ) st_404=sm.getString( "sc.404");
return st_404;
}
return sm.getString("sc."+ status);
}
/**
* Filter the specified message string for characters that are sensitive
* in HTML. This avoids potential attacks caused by including JavaScript
* codes in the request URL that is often reported in error messages.
*
* @param message The message string to be filtered
*/
public static String filter(String message) {
if (message == null)
return (null);
char content[] = new char[message.length()];
message.getChars(0, message.length(), content, 0);
StringBuffer result = new StringBuffer(content.length + 50);
for (int i = 0; i < content.length; i++) {
switch (content[i]) {
case '<':
result.append("<");
break;
case '>':
result.append(">");
break;
case '&':
result.append("&");
break;
case '"':
result.append(""");
break;
default:
result.append(content[i]);
}
}
return (result.toString());
}
/**
* Is the provided message safe to use in an HTTP header. Safe messages must
* meet the requirements of RFC2616 - i.e. must consist only of TEXT.
*
* @param msg The message to test
* @return <code>true</code> if the message is safe to use in an HTTP
* header else <code>false</code>
*/
public static boolean isSafeInHttpHeader(String msg) {
// Nulls are fine. It is up to the calling code to address any NPE
// concerns
if (msg == null) {
return true;
}
// Reason-Phrase is defined as *<TEXT, excluding CR, LF>
// TEXT is defined as any OCTET except CTLs, but including LWS
// OCTET is defined as an 8-bit sequence of data
// CTL is defined as octets 0-31 and 127
// LWS, if we exclude CR LF pairs, is defined as SP or HT (32, 9)
final int len = msg.length();
for (int i = 0; i < len; i++) {
char c = msg.charAt(i);
if (32 <= c && c <= 126 || 128 <= c && c <= 255 || c == 9) {
continue;
}
return false;
}
return true;
}
}
|
