1
|
/**
|
2
|
* '$RCSfile$'
|
3
|
* Purpose: A Class that implements session utility methods
|
4
|
* Copyright: 2008 Regents of the University of California and the
|
5
|
* National Center for Ecological Analysis and Synthesis
|
6
|
* Authors: Michael Daigle
|
7
|
*
|
8
|
* '$Author: leinfelder $'
|
9
|
* '$Date: 2010-08-19 17:03:20 -0700 (Thu, 19 Aug 2010) $'
|
10
|
* '$Revision: 5505 $'
|
11
|
*
|
12
|
* This program is free software; you can redistribute it and/or modify
|
13
|
* it under the terms of the GNU General Public License as published by
|
14
|
* the Free Software Foundation; either version 2 of the License, or
|
15
|
* (at your option) any later version.
|
16
|
*
|
17
|
* This program is distributed in the hope that it will be useful,
|
18
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
19
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
20
|
* GNU General Public License for more details.
|
21
|
*
|
22
|
* You should have received a copy of the GNU General Public License
|
23
|
* along with this program; if not, write to the Free Software
|
24
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
25
|
*/
|
26
|
|
27
|
package edu.ucsb.nceas.metacat.service;
|
28
|
|
29
|
import java.io.PrintWriter;
|
30
|
import java.util.Calendar;
|
31
|
import java.util.Enumeration;
|
32
|
import java.util.Hashtable;
|
33
|
|
34
|
import javax.servlet.http.HttpServletResponse;
|
35
|
|
36
|
import org.apache.log4j.Logger;
|
37
|
|
38
|
import edu.ucsb.nceas.metacat.properties.PropertyService;
|
39
|
import edu.ucsb.nceas.metacat.shared.BaseService;
|
40
|
import edu.ucsb.nceas.metacat.shared.ServiceException;
|
41
|
import edu.ucsb.nceas.metacat.util.SessionData;
|
42
|
import edu.ucsb.nceas.utilities.PropertyNotFoundException;
|
43
|
|
44
|
public class SessionService extends BaseService {
|
45
|
|
46
|
private static SessionService sessionService = null;
|
47
|
private static int sessionTimeoutMinutes;
|
48
|
|
49
|
private static Logger logMetacat = Logger.getLogger(SessionService.class);
|
50
|
private static Hashtable<String, SessionData> sessionHash = null;
|
51
|
|
52
|
private static final String PUBLIC_SESSION_ID = "0";
|
53
|
|
54
|
private static Object lockObj = new Object();
|
55
|
|
56
|
/**
|
57
|
* private constructor since this is a singleton
|
58
|
*/
|
59
|
private SessionService() throws ServiceException {
|
60
|
_serviceName = "SessionService";
|
61
|
|
62
|
String sessionTimeoutStr = null;
|
63
|
try {
|
64
|
sessionHash = new Hashtable<String, SessionData>();
|
65
|
sessionTimeoutStr = PropertyService.getProperty("session.timeoutMinutes");
|
66
|
sessionTimeoutMinutes = Integer.parseInt(sessionTimeoutStr);
|
67
|
|
68
|
logMetacat.debug("SessionService() - Registering public session id: " +
|
69
|
PUBLIC_SESSION_ID);
|
70
|
registerSession(PUBLIC_SESSION_ID, "public", null, null, "Public User");
|
71
|
} catch (PropertyNotFoundException pnfe) {
|
72
|
throw new ServiceException("SessionService() - Error getting property: " +
|
73
|
pnfe.getMessage());
|
74
|
} catch (NumberFormatException nfe) {
|
75
|
throw new ServiceException("SessionService() - Error parsing session timeout minutes: " +
|
76
|
sessionTimeoutStr);
|
77
|
}
|
78
|
}
|
79
|
|
80
|
/**
|
81
|
* Get the single instance of SessionService.
|
82
|
*
|
83
|
* @return the single instance of SessionService
|
84
|
*/
|
85
|
public static SessionService getInstance() {
|
86
|
try
|
87
|
{
|
88
|
if (sessionService == null) {
|
89
|
sessionService = new SessionService();
|
90
|
}
|
91
|
return sessionService;
|
92
|
}
|
93
|
catch(ServiceException se)
|
94
|
{
|
95
|
logMetacat.error("SessionService.getInstance - could not get " +
|
96
|
"an instance of SessionService: " + se.getMessage());
|
97
|
}
|
98
|
return null;
|
99
|
}
|
100
|
|
101
|
public boolean refreshable() {
|
102
|
return false;
|
103
|
}
|
104
|
|
105
|
public void doRefresh() throws ServiceException {
|
106
|
return;
|
107
|
}
|
108
|
|
109
|
public void stop() throws ServiceException {
|
110
|
return;
|
111
|
}
|
112
|
|
113
|
/**
|
114
|
* Register a session in the session hash table. This uses
|
115
|
* the parameters passed in to create a SessionData object.
|
116
|
*
|
117
|
* @param sessionId
|
118
|
* the ID of the session to register
|
119
|
* @param userName
|
120
|
* the user name of the session
|
121
|
* @param groupNames
|
122
|
* the group names for the session
|
123
|
* @param password
|
124
|
* the password for the session
|
125
|
*/
|
126
|
public void registerSession(String sessionId, String userName,
|
127
|
String[] groupNames, String password, String name) throws ServiceException {
|
128
|
synchronized(lockObj) {
|
129
|
if (sessionId == null) {
|
130
|
throw new ServiceException("SessionService.registerSession - " +
|
131
|
"Cannot register a null session id");
|
132
|
}
|
133
|
logMetacat.debug("SessionService.registerSession - Registering session id: " + sessionId);
|
134
|
SessionData sessionData = new SessionData(sessionId, userName, groupNames,
|
135
|
password, name);
|
136
|
sessionHash.put(sessionId, sessionData);
|
137
|
}
|
138
|
}
|
139
|
|
140
|
/**
|
141
|
* Register a session in the session hash table.
|
142
|
*
|
143
|
* @param sessionData
|
144
|
* the session data object to add to the session hash
|
145
|
*/
|
146
|
public void registerSession(SessionData sessionData) throws ServiceException {
|
147
|
synchronized(lockObj) {
|
148
|
if (sessionData == null) {
|
149
|
throw new ServiceException("SessionService.registerSession - " +
|
150
|
"Cannot register null session data");
|
151
|
}
|
152
|
logMetacat.debug("SessionService.registerSession - Registering session " +
|
153
|
"data with id: " + sessionData.getId());
|
154
|
sessionHash.put(sessionData.getId(), sessionData);
|
155
|
}
|
156
|
}
|
157
|
|
158
|
/**
|
159
|
* Unregister a session from the session hash table.
|
160
|
*
|
161
|
* @param sessionId
|
162
|
* the id of the session to remove.
|
163
|
*/
|
164
|
public void unRegisterSession(String sessionId) {
|
165
|
synchronized(lockObj) {
|
166
|
if (sessionId == null) {
|
167
|
logMetacat.error("SessionService.unRegisterSession - trying to " +
|
168
|
"unregister a session with null id");
|
169
|
return;
|
170
|
}
|
171
|
if (sessionId.equals(PUBLIC_SESSION_ID)) {
|
172
|
logMetacat.error("SessionService.unRegisterSession - cannot unregister public session, " +
|
173
|
"sessionId=" + sessionId);
|
174
|
return;
|
175
|
}
|
176
|
|
177
|
logMetacat.info("SessionService.unRegisterSession - unRegistering session: " + sessionId);
|
178
|
sessionHash.remove(sessionId);
|
179
|
}
|
180
|
}
|
181
|
|
182
|
/**
|
183
|
* Unregister all sessions from the session hash table except the public session.
|
184
|
*
|
185
|
* @param sessionId
|
186
|
* the id of the session to remove.
|
187
|
*/
|
188
|
public void unRegisterAllSessions() {
|
189
|
synchronized(lockObj) {
|
190
|
Enumeration<String> keyEnum = sessionHash.keys();
|
191
|
while (keyEnum.hasMoreElements()) {
|
192
|
String sessionId = keyEnum.nextElement();
|
193
|
if (!sessionId.equals(PUBLIC_SESSION_ID)) {
|
194
|
logMetacat.info("SessionService.unRegisterAllSessions - unRegistering session: " + sessionId);
|
195
|
sessionHash.remove(sessionId);
|
196
|
}
|
197
|
}
|
198
|
}
|
199
|
}
|
200
|
|
201
|
/**
|
202
|
* Check if a session is registered in the session hash table.
|
203
|
*
|
204
|
* @param sessionId
|
205
|
* the id of the session to look for.
|
206
|
*/
|
207
|
public boolean isSessionRegistered(String sessionId) {
|
208
|
if (sessionId == null) {
|
209
|
logMetacat.error("SessionService.isSessionRegistered - trying to check if a " +
|
210
|
"session with null id is registered");
|
211
|
return false;
|
212
|
}
|
213
|
|
214
|
checkTimeout(sessionId);
|
215
|
|
216
|
return sessionHash.containsKey(sessionId);
|
217
|
}
|
218
|
|
219
|
/**
|
220
|
* Check if a session is registered in the session hash table. Write results
|
221
|
* in XML format to output.
|
222
|
*
|
223
|
* @param out
|
224
|
* the output stream to write to.
|
225
|
* @param sessionId
|
226
|
* the id of the session to look for.
|
227
|
*/
|
228
|
public void validateSession(PrintWriter out, HttpServletResponse response,
|
229
|
String sessionId) {
|
230
|
|
231
|
response.setContentType("text/xml");
|
232
|
out.println("<?xml version=\"1.0\"?>");
|
233
|
out.write("<validateSession><status>");
|
234
|
if (validateSession(sessionId)) {
|
235
|
out.write("valid");
|
236
|
} else {
|
237
|
out.write("invalid");
|
238
|
}
|
239
|
out.write("</status>");
|
240
|
out.write("<sessionId>" + sessionId + "</sessionId></validateSession>");
|
241
|
}
|
242
|
|
243
|
/**
|
244
|
* Check if a session is registered in the session hash table. Return
|
245
|
* true if the session is valid and false otherwise.
|
246
|
*
|
247
|
* @param sessionId
|
248
|
* the id of the session to look for.
|
249
|
*/
|
250
|
public boolean validateSession(String sessionId) {
|
251
|
if (sessionId != null && !sessionId.equals(PUBLIC_SESSION_ID) && isSessionRegistered(sessionId)) {
|
252
|
return true;
|
253
|
} else {
|
254
|
return false;
|
255
|
}
|
256
|
}
|
257
|
|
258
|
/**
|
259
|
* Get a registered session from the session hash table.
|
260
|
* TODO MCD need to time sessions out
|
261
|
*
|
262
|
* @param sessionId
|
263
|
* the id of the session to retrieve.
|
264
|
*/
|
265
|
public SessionData getRegisteredSession(String sessionId) {
|
266
|
if (sessionId == null) {
|
267
|
logMetacat.error("SessionService.getRegisteredSession - trying to get a session with null id");
|
268
|
return null;
|
269
|
}
|
270
|
checkTimeout(sessionId);
|
271
|
|
272
|
return sessionHash.get(sessionId);
|
273
|
}
|
274
|
|
275
|
/**
|
276
|
* Get the public session from the session hash table.
|
277
|
*/
|
278
|
public SessionData getPublicSession() {
|
279
|
return sessionHash.get(PUBLIC_SESSION_ID);
|
280
|
}
|
281
|
|
282
|
/**
|
283
|
* Keep a session active by updating its last accessed time.
|
284
|
*
|
285
|
* @param sessionId
|
286
|
* the id of the session to update.
|
287
|
*/
|
288
|
public synchronized void touchSession(String sessionId) {
|
289
|
if (sessionId == null) {
|
290
|
logMetacat.error("SessionService.touchSession - trying to touch a session with null id");
|
291
|
} else if (isSessionRegistered(sessionId)) {
|
292
|
synchronized(lockObj) {
|
293
|
SessionData sessionData = getRegisteredSession(sessionId);
|
294
|
sessionData.setLastAccessedTime();
|
295
|
}
|
296
|
}
|
297
|
}
|
298
|
|
299
|
private void checkTimeout (String sessionId) {
|
300
|
SessionData sessionData = null;
|
301
|
if ((sessionData = sessionHash.get(sessionId)) != null) {
|
302
|
Calendar expireTime = Calendar.getInstance();
|
303
|
Calendar lastAccessedTime = sessionData.getLastAccessedTime();
|
304
|
expireTime.add(Calendar.MINUTE, 0 - sessionTimeoutMinutes);
|
305
|
if(lastAccessedTime.compareTo(expireTime) < 0 ) {
|
306
|
unRegisterSession(sessionId);
|
307
|
}
|
308
|
}
|
309
|
}
|
310
|
|
311
|
}
|