class/corlib/System.Security.Permissions/IsolatedStoragePermission.cs

   1 //
   2 // System.Security.Permissions.IsolatedStoragePermission.cs
   3 //
   4 // Authors:
   5 //      Piers Haken <piersh@friskit.com>
   6 //      Sebastien Pouliot  <sebastien@ximian.com>
   7 //
   8 // (C) 2002 Ximian, Inc.                        http://www.ximian.com
   9 // Copyright (C) 2004-2006 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 using System.Globalization;
  32 using System.Runtime.InteropServices;
  33
  34 namespace System.Security.Permissions {
  35
  36         [Serializable]
  37         [SecurityPermission (SecurityAction.InheritanceDemand, ControlEvidence = true, ControlPolicy = true)]
  38         [ComVisible (true)]
  39         public abstract class IsolatedStoragePermission : CodeAccessPermission, IUnrestrictedPermission {
  40
  41                 private const int version = 1;
  42
  43                 internal long m_userQuota;
  44                 internal long m_machineQuota;
  45                 internal long m_expirationDays;
  46                 internal bool m_permanentData;
  47                 internal IsolatedStorageContainment m_allowed;
  48
  49                 protected IsolatedStoragePermission (PermissionState state)
  50                 {
  51                         if (CheckPermissionState (state, true) == PermissionState.Unrestricted) {
  52                                 UsageAllowed = IsolatedStorageContainment.UnrestrictedIsolatedStorage;
  53                         }
  54                 }
  55
  56                 public long UserQuota {
  57                         get { return m_userQuota; }
  58                         set { m_userQuota = value; }
  59                 }
  60
  61                 public IsolatedStorageContainment UsageAllowed {
  62                         get { return m_allowed; }
  63                         set {
  64                                 if (!Enum.IsDefined (typeof (IsolatedStorageContainment), value)) {
  65                                         string msg = String.Format (Locale.GetText ("Invalid enum {0}"), value);
  66                                         throw new ArgumentException (msg, "IsolatedStorageContainment");
  67                                 }
  68                                 m_allowed = value;
  69                                 if (m_allowed == IsolatedStorageContainment.UnrestrictedIsolatedStorage) {
  70                                         m_userQuota = Int64.MaxValue;
  71                                         m_machineQuota = Int64.MaxValue;
  72                                         m_expirationDays = Int64.MaxValue ;
  73                                         m_permanentData = true;
  74                                 }
  75                         }
  76                 }
  77
  78
  79                 public bool IsUnrestricted ()
  80                 {
  81                         return IsolatedStorageContainment.UnrestrictedIsolatedStorage == m_allowed;
  82                 }
  83
  84                 public override SecurityElement ToXml ()
  85                 {
  86                         SecurityElement se = Element (version);
  87
  88                         if (m_allowed == IsolatedStorageContainment.UnrestrictedIsolatedStorage)
  89                                 se.AddAttribute ("Unrestricted", "true");
  90                         else {
  91                                 se.AddAttribute ("Allowed", m_allowed.ToString ());
  92                                 if (m_userQuota > 0)
  93                                         se.AddAttribute ("UserQuota", m_userQuota.ToString ());
  94                         }
  95
  96                         return se;
  97                 }
  98
  99                 public override void FromXml (SecurityElement esd)
 100                 {
 101                         // General validation in CodeAccessPermission
 102                         CheckSecurityElement (esd, "esd", version, version);
 103                         // Note: we do not (yet) care about the return value
 104                         // as we only accept version 1 (min/max values)
 105
 106                         m_userQuota = 0;
 107                         m_machineQuota = 0;
 108                         m_expirationDays = 0;
 109                         m_permanentData = false;
 110                         m_allowed = IsolatedStorageContainment.None;
 111
 112                         if (IsUnrestricted (esd)) {
 113                                 UsageAllowed = IsolatedStorageContainment.UnrestrictedIsolatedStorage;
 114                         } else {
 115                                 string a = esd.Attribute ("Allowed");
 116                                 if (a != null) {
 117                                         UsageAllowed = (IsolatedStorageContainment) Enum.Parse (
 118                                                 typeof (IsolatedStorageContainment), a);
 119                                 }
 120                                 a = esd.Attribute ("UserQuota");
 121                                 if (a != null) {
 122                                         Exception exc;
 123                                         Int64.Parse (a, true, out m_userQuota, out exc);
 124                                 }
 125                         }
 126                 }
 127
 128                 // helpers
 129
 130                 internal bool IsEmpty ()
 131                 {
 132                         // should we include internals ? or just publics ?
 133                         return ((m_userQuota == 0) && (m_allowed == IsolatedStorageContainment.None));
 134                 }
 135         }
 136 }