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
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
/*
* 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.naming.factory;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import javax.naming.Context;
import javax.naming.Name;
import javax.naming.NamingException;
import javax.naming.RefAddr;
import javax.naming.Reference;
import javax.naming.spi.ObjectFactory;
import org.apache.naming.ResourceLinkRef;
/**
* <p>Object factory for resource links.</p>
*
* @author Remy Maucherat
*/
public class ResourceLinkFactory
implements ObjectFactory {
// ----------------------------------------------------------- Constructors
// ------------------------------------------------------- Static Variables
/**
* Global naming context.
*/
private static Context globalContext = null;
private static Map<ClassLoader,Map<String,String>> globalResourceRegistrations =
new ConcurrentHashMap<ClassLoader,Map<String,String>>();
// --------------------------------------------------------- Public Methods
/**
* Set the global context (note: can only be used once).
*
* @param newGlobalContext new global context value
*/
public static void setGlobalContext(Context newGlobalContext) {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(new RuntimePermission(
ResourceLinkFactory.class.getName() + ".setGlobalContext"));
}
globalContext = newGlobalContext;
}
public static void registerGlobalResourceAccess(Context globalContext, String localName,
String globalName) {
validateGlobalContext(globalContext);
ClassLoader cl = Thread.currentThread().getContextClassLoader();
Map<String,String> registrations = globalResourceRegistrations.get(cl);
if (registrations == null) {
// Web application initialization is single threaded so this is
// safe.
registrations = new HashMap<String,String>();
globalResourceRegistrations.put(cl, registrations);
}
registrations.put(localName, globalName);
}
public static void deregisterGlobalResourceAccess(Context globalContext, String localName) {
validateGlobalContext(globalContext);
ClassLoader cl = Thread.currentThread().getContextClassLoader();
Map<String,String> registrations = globalResourceRegistrations.get(cl);
if (registrations != null) {
registrations.remove(localName);
}
}
public static void deregisterGlobalResourceAccess(Context globalContext) {
validateGlobalContext(globalContext);
ClassLoader cl = Thread.currentThread().getContextClassLoader();
globalResourceRegistrations.remove(cl);
}
private static void validateGlobalContext(Context globalContext) {
if (ResourceLinkFactory.globalContext != null &&
ResourceLinkFactory.globalContext != globalContext) {
throw new SecurityException("Caller provided invalid global context");
}
}
private static boolean validateGlobalResourceAccess(String globalName) {
ClassLoader cl = Thread.currentThread().getContextClassLoader();
while (cl != null) {
Map<String,String> registrations = globalResourceRegistrations.get(cl);
if (registrations != null && registrations.containsValue(globalName)) {
return true;
}
cl = cl.getParent();
}
return false;
}
// -------------------------------------------------- ObjectFactory Methods
/**
* Create a new DataSource instance.
*
* @param obj The reference object describing the DataSource
*/
@Override
public Object getObjectInstance(Object obj, Name name, Context nameCtx,
Hashtable<?,?> environment)
throws NamingException {
if (!(obj instanceof ResourceLinkRef))
return null;
// Can we process this request?
Reference ref = (Reference) obj;
// Read the global ref addr
String globalName = null;
RefAddr refAddr = ref.get(ResourceLinkRef.GLOBALNAME);
if (refAddr != null) {
globalName = refAddr.getContent().toString();
// When running under a security manager confirm that the current
// web application has really been configured to access the specified
// global resource
if (!validateGlobalResourceAccess(globalName)) {
return null;
}
Object result = null;
result = globalContext.lookup(globalName);
// FIXME: Check type
return result;
}
return (null);
}
}
|
