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//
// System.Web.SessionState.SesionStateModule
//
// Authors:
// Gonzalo Paniagua Javier (gonzalo@ximian.com)
// Stefan Görling (stefan@gorling.se)
// Jackson Harper (jackson@ximian.com)
//
// (C) 2002,2003 Ximian, Inc (http://www.ximian.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.
//
using System.Web;
using System.Web.Caching;
using System.Web.Util;
using System.Security.Cryptography;
namespace System.Web.SessionState
{
public sealed class SessionStateModule : IHttpModule
{
internal static readonly string CookieName = "ASPSESSION";
internal static readonly string HeaderName = "AspFilterSessionId";
static SessionConfig config;
static Type handlerType;
ISessionHandler handler;
private RandomNumberGenerator rng;
public SessionStateModule ()
{
rng = new RNGCryptoServiceProvider ();
}
internal RandomNumberGenerator Rng {
get { return rng; }
}
public void Dispose ()
{
if (handler!=null)
handler.Dispose();
}
public void Init (HttpApplication app)
{
if (config == null) {
config = (SessionConfig) HttpContext.GetAppConfig ("system.web/sessionState");
if (config == null)
config = new SessionConfig (null);
if (config.Mode == SessionStateMode.StateServer)
handlerType = typeof (SessionStateServerHandler);
if (config.Mode == SessionStateMode.SQLServer)
handlerType = typeof (SessionSQLServerHandler);
if (config.Mode == SessionStateMode.InProc)
handlerType = typeof (SessionInProcHandler);
if (config.Mode == SessionStateMode.Off)
return;
}
if (config.CookieLess)
app.BeginRequest += new EventHandler (OnBeginRequest);
app.AddOnAcquireRequestStateAsync (
new BeginEventHandler (OnBeginAcquireState),
new EndEventHandler (OnEndAcquireState));
app.ReleaseRequestState += new EventHandler (OnReleaseRequestState);
app.EndRequest += new EventHandler (OnEndRequest);
if (handlerType != null && handler == null) {
handler = (ISessionHandler) Activator.CreateInstance (handlerType);
handler.Init (this, app, config); //initialize
}
}
void OnBeginRequest (object o, EventArgs args)
{
HttpApplication application = (HttpApplication) o;
HttpContext context = application.Context;
string base_path = context.Request.BaseVirtualDir;
string id = UrlUtils.GetSessionId (base_path);
if (id == null)
return;
context.Request.SetFilePath (UrlUtils.RemoveSessionId (base_path,
context.Request.FilePath));
context.Request.SetHeader (HeaderName, id);
}
void OnReleaseRequestState (object o, EventArgs args)
{
if (handler == null)
return;
HttpApplication application = (HttpApplication) o;
HttpContext context = application.Context;
handler.UpdateHandler (context, this);
}
void OnEndRequest (object o, EventArgs args)
{
}
IAsyncResult OnBeginAcquireState (object o, EventArgs args, AsyncCallback cb, object data)
{
HttpApplication application = (HttpApplication) o;
HttpContext context = application.Context;
bool required = (context.Handler is IRequiresSessionState);
bool read_only = (context.Handler is IReadOnlySessionState);
bool isNew = false;
HttpSessionState session = null;
if (handler != null)
session = handler.UpdateContext (context, this, required, read_only, ref isNew);
if (session != null) {
if (isNew)
session.SetNewSession (true);
if (read_only)
session = session.Clone ();
context.SetSession (session);
if (isNew && config.CookieLess) {
string id = context.Session.SessionID;
context.Request.SetHeader (HeaderName, id);
context.Response.Redirect (UrlUtils.InsertSessionId (id,
context.Request.FilePath));
} else if (isNew) {
string id = context.Session.SessionID;
HttpCookie cookie = new HttpCookie (CookieName, id);
cookie.Path = UrlUtils.GetDirectory (context.Request.ApplicationPath);
context.Response.AppendCookie (cookie);
}
}
// In the future, we might want to move the Async stuff down to
// the interface level, if we're going to support other than
// InProc, we might actually want to do things async, now we
// simply fake it.
HttpAsyncResult result=new HttpAsyncResult (cb,this);
result.Complete (true, o, null);
if (isNew && Start != null)
Start (this, args);
return result;
}
void OnEndAcquireState (IAsyncResult result) { }
internal void OnSessionRemoved (string key, object value, CacheItemRemovedReason reason)
{
OnEnd ();
}
internal void OnEnd ()
{
if (End != null)
End (this, EventArgs.Empty);
}
public event EventHandler Start;
public event EventHandler End;
}
}
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