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15 package org.mortbay.jetty.servlet;
16
17 import java.security.NoSuchAlgorithmException;
18 import java.security.SecureRandom;
19 import java.util.Random;
20
21 import javax.servlet.http.HttpServletRequest;
22 import javax.servlet.http.HttpSession;
23
24 import org.mortbay.component.AbstractLifeCycle;
25 import org.mortbay.jetty.SessionIdManager;
26 import org.mortbay.jetty.servlet.AbstractSessionManager.Session;
27 import org.mortbay.log.Log;
28 import org.mortbay.util.MultiMap;
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33
34 public class HashSessionIdManager extends AbstractLifeCycle implements SessionIdManager
35 {
36 private final static String __NEW_SESSION_ID="org.mortbay.jetty.newSessionId";
37 protected final static String SESSION_ID_RANDOM_ALGORITHM = "SHA1PRNG";
38 protected final static String SESSION_ID_RANDOM_ALGORITHM_ALT = "IBMSecureRandom";
39
40 MultiMap<String> _sessions;
41 protected Random _random;
42 private boolean _weakRandom;
43 private String _workerName;
44
45
46 public HashSessionIdManager()
47 {
48 }
49
50
51 public HashSessionIdManager(Random random)
52 {
53 _random=random;
54
55 }
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64 public String getWorkerName()
65 {
66 return _workerName;
67 }
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76 public void setWorkerName(String workerName)
77 {
78 _workerName=workerName;
79 }
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87 public String getNodeId(String clusterId,HttpServletRequest request)
88 {
89 String worker=request==null?null:(String)request.getAttribute("org.mortbay.http.ajp.JVMRoute");
90 if (worker!=null)
91 return clusterId+'.'+worker;
92
93 if (_workerName!=null)
94 return clusterId+'.'+_workerName;
95
96 return clusterId;
97 }
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105 public String getClusterId(String nodeId)
106 {
107 int dot=nodeId.lastIndexOf('.');
108 return (dot>0)?nodeId.substring(0,dot):nodeId;
109 }
110
111
112 protected void doStart()
113 {
114 if (_random==null)
115 {
116 try
117 {
118 _random=SecureRandom.getInstance(SESSION_ID_RANDOM_ALGORITHM);
119 }
120 catch (NoSuchAlgorithmException e)
121 {
122 try
123 {
124 _random=SecureRandom.getInstance(SESSION_ID_RANDOM_ALGORITHM_ALT);
125 _weakRandom=false;
126 }
127 catch (NoSuchAlgorithmException e_alt)
128 {
129 Log.warn("Could not generate SecureRandom for session-id randomness",e);
130 _random=new Random();
131 _weakRandom=true;
132 }
133 }
134 }
135 _random.setSeed(_random.nextLong()^System.currentTimeMillis()^hashCode()^Runtime.getRuntime().freeMemory());
136 _sessions=new MultiMap<String>(true);
137 }
138
139
140 protected void doStop()
141 {
142 if (_sessions!=null)
143 _sessions.clear();
144 _sessions=null;
145 }
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150
151 public boolean idInUse(String id)
152 {
153 return _sessions.containsKey(id);
154 }
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160 public void addSession(HttpSession session)
161 {
162 _sessions.add(getClusterId(session.getId()),session);
163 }
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169 public void removeSession(HttpSession session)
170 {
171 _sessions.removeValue(getClusterId(session.getId()),session);
172 }
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177
178 public void invalidateAll(String id)
179 {
180
181
182 while (_sessions.containsKey(id))
183 {
184 Session session=(Session)_sessions.getValue(id,0);
185 if (session.isValid())
186 session.invalidate();
187 else
188 _sessions.removeValue(id,session);
189 }
190 }
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201 public String newSessionId(HttpServletRequest request, long created)
202 {
203 synchronized (this)
204 {
205
206 String requested_id=request.getRequestedSessionId();
207
208 if (requested_id!=null)
209 {
210 String cluster_id=getClusterId(requested_id);
211 if (idInUse(cluster_id))
212 return cluster_id;
213 }
214
215
216 String new_id=(String)request.getAttribute(__NEW_SESSION_ID);
217 if (new_id!=null&&idInUse(new_id))
218 return new_id;
219
220
221 String id=null;
222 while (id==null||id.length()==0||idInUse(id))
223 {
224 long r=_weakRandom
225 ?(hashCode()^Runtime.getRuntime().freeMemory()^_random.nextInt()^(((long)request.hashCode())<<32))
226 :_random.nextLong();
227 r^=created;
228 if (request!=null && request.getRemoteAddr()!=null)
229 r^=request.getRemoteAddr().hashCode();
230 if (r<0)
231 r=-r;
232 id=Long.toString(r,36);
233 }
234
235 request.setAttribute(__NEW_SESSION_ID,id);
236 return id;
237 }
238 }
239
240
241 public Random getRandom()
242 {
243 return _random;
244 }
245
246
247 public void setRandom(Random random)
248 {
249 _random=random;
250 _weakRandom=false;
251 }
252
253 }