mcs/class/System.Web/System.Web.Security/AnonymousIdentificationModule.cs

   1 //
   2 // System.Web.Security.AnonymousIdentificationModule
   3 //
   4 // Authors:
   5 //      Ben Maurer (bmaurer@users.sourceforge.net)
   6 //      Chris Toshok (toshok@ximian.com)
   7 //
   8 // (C) 2003 Ben Maurer
   9 // Copyright (c) 2005 Novell, Inc (http://www.novell.com)
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 #if NET_2_0
  32
  33 using System;
  34 using System.Web;
  35 using System.Web.Configuration;
  36 using System.Text;
  37
  38 namespace System.Web.Security {
  39
  40         public sealed class AnonymousIdentificationModule : IHttpModule {
  41
  42                 HttpApplication app;
  43                 public event AnonymousIdentificationEventHandler Creating;
  44
  45                 public static void ClearAnonymousIdentifier ()
  46                 {
  47                         if (Config == null || !Config.Enabled)
  48                                 /* XXX The user for the current request is anonymous */
  49                                 throw new NotSupportedException ();
  50                 }
  51
  52                 public void Dispose ()
  53                 {
  54                         app.PostAuthenticateRequest -= OnEnter;
  55                         app = null;
  56                 }
  57
  58                 public void Init (HttpApplication app)
  59                 {
  60                         this.app = app;
  61                         app.PostAuthenticateRequest += OnEnter;
  62                 }
  63
  64                 [MonoTODO ("cookieless userid")]
  65                 void OnEnter (object source, EventArgs eventArgs)
  66                 {
  67                         if (!Enabled)
  68                                 return;
  69
  70                         string anonymousID = null;
  71
  72                         HttpCookie cookie = app.Request.Cookies [Config.CookieName];
  73                         if (cookie != null && (cookie.Expires == DateTime.MinValue || cookie.Expires > DateTime.Now)) {
  74                                 try {
  75                                         anonymousID = Encoding.Unicode.GetString (Convert.FromBase64String (cookie.Value));
  76                                 }
  77                                 catch { }
  78                         }
  79
  80                         if (anonymousID == null) {
  81                                 if (Creating != null) {
  82                                         AnonymousIdentificationEventArgs e = new AnonymousIdentificationEventArgs (HttpContext.Current);
  83                                         Creating (this, e);
  84
  85                                         anonymousID = e.AnonymousID;
  86                                 }
  87
  88                                 if (anonymousID == null)
  89                                         anonymousID = Guid.NewGuid ().ToString ();
  90
  91                                 HttpCookie newCookie = new HttpCookie (Config.CookieName);
  92                                 newCookie.Path = app.Request.ApplicationPath;
  93                                 newCookie.Expires = DateTime.Now + Config.CookieTimeout;
  94                                 newCookie.Value = Convert.ToBase64String (Encoding.Unicode.GetBytes (anonymousID));
  95                                 app.Response.AppendCookie (newCookie);
  96                         }
  97                         app.Request.AnonymousID = anonymousID;
  98                 }
  99
 100                 public static bool Enabled {
 101                         get {
 102                                 if (Config == null)
 103                                         return false;
 104
 105                                 return Config.Enabled;
 106                         }
 107                 }
 108
 109                 static AnonymousIdentificationSection Config
 110                 {
 111                         get
 112                         {
 113                                 return (AnonymousIdentificationSection) WebConfigurationManager.GetSection ("system.web/anonymousIdentification");
 114                         }
 115                 }
 116         }
 117 }
 118 #endif
 119