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
139
140
141
142
143
|
/*
* Copyright (c) 1998, 2004, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.security.util;
import java.net.URI;
import java.net.URISyntaxException;
import java.security.GeneralSecurityException;
/**
* A utility class to expand properties embedded in a string.
* Strings of the form ${some.property.name} are expanded to
* be the value of the property. Also, the special ${/} property
* is expanded to be the same as file.separator. If a property
* is not set, a GeneralSecurityException will be thrown.
*
* @author Roland Schemers
*/
public class PropertyExpander {
public static class ExpandException extends GeneralSecurityException {
private static final long serialVersionUID = -7941948581406161702L;
public ExpandException(String msg) {
super(msg);
}
}
public static String expand(String value)
throws ExpandException
{
return expand(value, false);
}
public static String expand(String value, boolean encodeURL)
throws ExpandException
{
if (value == null)
return null;
int p = value.indexOf("${", 0);
// no special characters
if (p == -1) return value;
StringBuffer sb = new StringBuffer(value.length());
int max = value.length();
int i = 0; // index of last character we copied
scanner:
while (p < max) {
if (p > i) {
// copy in anything before the special stuff
sb.append(value.substring(i, p));
i = p;
}
int pe = p+2;
// do not expand ${{ ... }}
if (pe < max && value.charAt(pe) == '{') {
pe = value.indexOf("}}", pe);
if (pe == -1 || pe+2 == max) {
// append remaining chars
sb.append(value.substring(p));
break scanner;
} else {
// append as normal text
pe++;
sb.append(value.substring(p, pe+1));
}
} else {
while ((pe < max) && (value.charAt(pe) != '}')) {
pe++;
}
if (pe == max) {
// no matching '}' found, just add in as normal text
sb.append(value.substring(p, pe));
break scanner;
}
String prop = value.substring(p+2, pe);
if (prop.equals("/")) {
sb.append(java.io.File.separatorChar);
} else {
String val = System.getProperty(prop);
if (val != null) {
if (encodeURL) {
// encode 'val' unless it's an absolute URI
// at the beginning of the string buffer
try {
if (sb.length() > 0 ||
!(new URI(val)).isAbsolute()) {
val = sun.net.www.ParseUtil.encodePath(val);
}
} catch (URISyntaxException use) {
val = sun.net.www.ParseUtil.encodePath(val);
}
}
sb.append(val);
} else {
throw new ExpandException(
"unable to expand property " +
prop);
}
}
}
i = pe+1;
p = value.indexOf("${", i);
if (p == -1) {
// no more to expand. copy in any extra
if (i < max) {
sb.append(value.substring(i, max));
}
// break out of loop
break scanner;
}
}
return sb.toString();
}
}
|
