-
Notifications
You must be signed in to change notification settings - Fork 3.8k
/
SessionStateModule.cs
405 lines (352 loc) · 13.6 KB
/
SessionStateModule.cs
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
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
//
// System.Web.SessionState.SesionStateModule
//
// Authors:
// Gonzalo Paniagua Javier (gonzalo@ximian.com)
// Stefan Görling (stefan@gorling.se)
// Jackson Harper (jackson@ximian.com)
// Marek Habersack (grendello@gmail.com)
//
// Copyright (C) 2002-2006 Novell, Inc (http://www.novell.com)
// (C) 2003 Stefan Görling (http://www.gorling.se)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
#if NET_2_0
using System.Collections.Specialized;
using System.ComponentModel;
using System.Web.Configuration;
using System.Web.Caching;
using System.Web.Util;
using System.Security.Cryptography;
using System.Security.Permissions;
using System.Threading;
using System.Configuration;
using System.Diagnostics;
namespace System.Web.SessionState
{
// CAS - no InheritanceDemand here as the class is sealed
[AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
public sealed class SessionStateModule : IHttpModule
{
class CallbackState
{
public readonly HttpContext Context;
public readonly AutoResetEvent AutoEvent;
public readonly string SessionId;
public readonly bool IsReadOnly;
public CallbackState (HttpContext context, AutoResetEvent e, string sessionId, bool isReadOnly) {
this.Context = context;
this.AutoEvent = e;
this.SessionId = sessionId;
this.IsReadOnly = isReadOnly;
}
}
internal const string HeaderName = "AspFilterSessionId";
internal const string CookielessFlagName = "_SessionIDManager_IsCookieLess";
static readonly object startEvent = new object ();
static readonly object endEvent = new object ();
SessionStateSection config;
SessionStateStoreProviderBase handler;
ISessionIDManager idManager;
bool supportsExpiration;
HttpApplication app;
// Store state
bool storeLocked;
TimeSpan storeLockAge;
object storeLockId;
SessionStateActions storeSessionAction;
// Session state
SessionStateStoreData storeData;
HttpSessionStateContainer container;
// config
TimeSpan executionTimeout;
//int executionTimeoutMS;
EventHandlerList events = new EventHandlerList ();
public event EventHandler Start {
add { events.AddHandler (startEvent, value); }
remove { events.RemoveHandler (startEvent, value); }
}
// This event is public, but only Session_[On]End in global.asax will be invoked if present.
public event EventHandler End {
add { events.AddHandler (endEvent, value); }
remove { events.RemoveHandler (endEvent, value); }
}
[SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
public SessionStateModule () {
}
public void Dispose () {
app.BeginRequest -= new EventHandler (OnBeginRequest);
app.AcquireRequestState -= new EventHandler (OnAcquireRequestState);
app.ReleaseRequestState -= new EventHandler (OnReleaseRequestState);
app.EndRequest -= new EventHandler (OnEndRequest);
handler.Dispose ();
}
[EnvironmentPermission (SecurityAction.Assert, Read = "MONO_XSP_STATIC_SESSION")]
public void Init (HttpApplication app) {
config = (SessionStateSection) WebConfigurationManager.GetSection ("system.web/sessionState");
ProviderSettings settings;
switch (config.Mode) {
case SessionStateMode.Custom:
settings = config.Providers [config.CustomProvider];
if (settings == null)
throw new HttpException (String.Format ("Cannot find '{0}' provider.", config.CustomProvider));
break;
case SessionStateMode.Off:
return;
#if TARGET_J2EE
default:
config = new SessionStateSection ();
config.Mode = SessionStateMode.Custom;
config.CustomProvider = "ServletSessionStateStore";
config.SessionIDManagerType = "Mainsoft.Web.SessionState.ServletSessionIDManager";
config.Providers.Add (new ProviderSettings ("ServletSessionStateStore", "Mainsoft.Web.SessionState.ServletSessionStateStoreProvider"));
goto case SessionStateMode.Custom;
#else
case SessionStateMode.InProc:
settings = new ProviderSettings (null, typeof (SessionInProcHandler).AssemblyQualifiedName);
break;
case SessionStateMode.SQLServer:
//settings = new ProviderSettings (null, typeof (SessionInProcHandler).AssemblyQualifiedName);
//break;
default:
throw new NotImplementedException (String.Format ("The mode '{0}' is not implemented.", config.Mode));
case SessionStateMode.StateServer:
settings = new ProviderSettings (null, typeof (SessionStateServerHandler).AssemblyQualifiedName);
break;
#endif
}
handler = (SessionStateStoreProviderBase) ProvidersHelper.InstantiateProvider (settings, typeof (SessionStateStoreProviderBase));
if (String.IsNullOrEmpty(config.SessionIDManagerType)) {
idManager = new SessionIDManager ();
} else {
Type idManagerType = HttpApplication.LoadType (config.SessionIDManagerType, true);
idManager = (ISessionIDManager)Activator.CreateInstance (idManagerType);
}
try {
idManager.Initialize ();
} catch (Exception ex) {
throw new HttpException ("Failed to initialize session ID manager.", ex);
}
supportsExpiration = handler.SetItemExpireCallback (OnSessionExpired);
HttpRuntimeSection runtime = WebConfigurationManager.GetSection ("system.web/httpRuntime") as HttpRuntimeSection;
executionTimeout = runtime.ExecutionTimeout;
//executionTimeoutMS = executionTimeout.Milliseconds;
this.app = app;
app.BeginRequest += new EventHandler (OnBeginRequest);
app.AcquireRequestState += new EventHandler (OnAcquireRequestState);
app.ReleaseRequestState += new EventHandler (OnReleaseRequestState);
app.EndRequest += new EventHandler (OnEndRequest);
}
internal static bool IsCookieLess (HttpContext context, SessionStateSection config) {
if (config.Cookieless == HttpCookieMode.UseCookies)
return false;
if (config.Cookieless == HttpCookieMode.UseUri)
return true;
object cookieless = context.Items [CookielessFlagName];
if (cookieless == null)
return false;
return (bool) cookieless;
}
void OnBeginRequest (object o, EventArgs args)
{
HttpApplication application = (HttpApplication) o;
HttpContext context = application.Context;
string file_path = context.Request.FilePath;
string base_path = VirtualPathUtility.GetDirectory (file_path);
string id = UrlUtils.GetSessionId (base_path);
if (id == null)
return;
string new_path = UrlUtils.RemoveSessionId (base_path, file_path);
context.Request.SetFilePath (new_path);
context.Request.SetHeader (HeaderName, id);
context.Response.SetAppPathModifier (id);
}
void OnAcquireRequestState (object o, EventArgs args) {
Trace.WriteLine ("SessionStateModule.OnAcquireRequestState (hash " + this.GetHashCode ().ToString ("x") + ")");
HttpApplication application = (HttpApplication) o;
HttpContext context = application.Context;
if (!(context.Handler is IRequiresSessionState)) {
Trace.WriteLine ("Handler (" + context.Handler + ") does not require session state");
return;
}
bool isReadOnly = (context.Handler is IReadOnlySessionState);
bool supportSessionIDReissue;
if (idManager.InitializeRequest (context, false, out supportSessionIDReissue))
return; // Redirected, will come back here in a while
string sessionId = idManager.GetSessionID (context);
handler.InitializeRequest (context);
GetStoreData (context, sessionId, isReadOnly);
bool isNew = false;
if (storeData == null && !storeLocked) {
isNew = true;
sessionId = idManager.CreateSessionID (context);
Trace.WriteLine ("New session ID allocated: " + sessionId);
bool redirected;
bool cookieAdded;
idManager.SaveSessionID (context, sessionId, out redirected, out cookieAdded);
if (redirected) {
if (supportSessionIDReissue)
handler.CreateUninitializedItem (context, sessionId, (int)config.Timeout.TotalMinutes);
context.Response.End ();
return;
}
else
storeData = handler.CreateNewStoreData (context, (int)config.Timeout.TotalMinutes);
}
else if (storeData == null && storeLocked) {
WaitForStoreUnlock (context, sessionId, isReadOnly);
}
else if (storeData != null &&
!storeLocked &&
storeSessionAction == SessionStateActions.InitializeItem &&
IsCookieLess (context, config)) {
storeData = handler.CreateNewStoreData (context, (int)config.Timeout.TotalMinutes);
}
container = CreateContainer (sessionId, storeData, isNew, isReadOnly);
SessionStateUtility.AddHttpSessionStateToContext (app.Context, container);
if (isNew) {
OnSessionStart ();
HttpSessionState hss = app.Session;
if (hss != null)
storeData.Timeout = hss.Timeout;
}
}
void OnReleaseRequestState (object o, EventArgs args) {
Trace.WriteLine ("SessionStateModule.OnReleaseRequestState (hash " + this.GetHashCode ().ToString ("x") + ")");
HttpApplication application = (HttpApplication) o;
HttpContext context = application.Context;
if (!(context.Handler is IRequiresSessionState))
return;
Trace.WriteLine ("\tsessionId == " + container.SessionID);
Trace.WriteLine ("\trequest path == " + context.Request.FilePath);
Trace.WriteLine ("\tHandler (" + context.Handler + ") requires session state");
try {
if (!container.IsAbandoned) {
Trace.WriteLine ("\tnot abandoned");
if (!container.IsReadOnly) {
Trace.WriteLine ("\tnot read only, storing and releasing");
handler.SetAndReleaseItemExclusive (context, container.SessionID, storeData, storeLockId, false);
}
else {
Trace.WriteLine ("\tread only, releasing");
handler.ReleaseItemExclusive (context, container.SessionID, storeLockId);
}
handler.ResetItemTimeout (context, container.SessionID);
}
else {
handler.ReleaseItemExclusive (context, container.SessionID, storeLockId);
handler.RemoveItem (context, container.SessionID, storeLockId, storeData);
if (supportsExpiration)
#if TARGET_J2EE
;
else
#else
// Make sure the expiration handler is not called after we will have raised
// the session end event.
handler.SetItemExpireCallback (null);
#endif
SessionStateUtility.RaiseSessionEnd (container, this, args);
}
SessionStateUtility.RemoveHttpSessionStateFromContext (context);
}
finally {
container = null;
storeData = null;
}
}
void OnEndRequest (object o, EventArgs args) {
if (handler == null)
return;
if (container != null)
OnReleaseRequestState (o, args);
HttpApplication application = o as HttpApplication;
if (application == null)
return;
if (handler != null)
handler.EndRequest (application.Context);
}
void GetStoreData (HttpContext context, string sessionId, bool isReadOnly) {
storeData = (isReadOnly) ?
handler.GetItem (context,
sessionId,
out storeLocked,
out storeLockAge,
out storeLockId,
out storeSessionAction)
:
handler.GetItemExclusive (context,
sessionId,
out storeLocked,
out storeLockAge,
out storeLockId,
out storeSessionAction);
}
void WaitForStoreUnlock (HttpContext context, string sessionId, bool isReadonly) {
AutoResetEvent are = new AutoResetEvent (false);
TimerCallback tc = new TimerCallback (StoreUnlockWaitCallback);
CallbackState cs = new CallbackState (context, are, sessionId, isReadonly);
using (Timer timer = new Timer (tc, cs, 500, 500)) {
try {
are.WaitOne (executionTimeout, false);
}
catch {
storeData = null;
}
}
}
void StoreUnlockWaitCallback (object s) {
CallbackState state = (CallbackState) s;
GetStoreData (state.Context, state.SessionId, state.IsReadOnly);
if (storeData == null && storeLocked && (storeLockAge > executionTimeout)) {
handler.ReleaseItemExclusive (state.Context, state.SessionId, storeLockId);
state.AutoEvent.Set ();
}
else if (storeData != null && !storeLocked)
state.AutoEvent.Set ();
}
HttpSessionStateContainer CreateContainer (string sessionId, SessionStateStoreData data, bool isNew, bool isReadOnly) {
if (data == null)
return new HttpSessionStateContainer (
sessionId, null, null, 0, isNew,
config.Cookieless, config.Mode, isReadOnly);
return new HttpSessionStateContainer (
sessionId,
data.Items,
data.StaticObjects,
data.Timeout,
isNew,
config.Cookieless,
config.Mode,
isReadOnly);
}
void OnSessionExpired (string id, SessionStateStoreData item) {
SessionStateUtility.RaiseSessionEnd (
CreateContainer (id, item, false, true),
this, EventArgs.Empty);
}
void OnSessionStart () {
EventHandler eh = events [startEvent] as EventHandler;
if (eh != null)
eh (this, EventArgs.Empty);
}
}
}
#endif