2 // System.Security.Permissions.UrlIdentityPermission.cs
5 // Sebastien Pouliot <sebastien@ximian.com>
7 // Copyright (C) 2003 Motus Technologies. http://www.motus.com
8 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
10 // Permission is hereby granted, free of charge, to any person obtaining
11 // a copy of this software and associated documentation files (the
12 // "Software"), to deal in the Software without restriction, including
13 // without limitation the rights to use, copy, modify, merge, publish,
14 // distribute, sublicense, and/or sell copies of the Software, and to
15 // permit persons to whom the Software is furnished to do so, subject to
16 // the following conditions:
18 // The above copyright notice and this permission notice shall be
19 // included in all copies or substantial portions of the Software.
21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
30 using System.Globalization;
31 using System.Runtime.InteropServices;
33 namespace System.Security.Permissions {
37 public sealed class UrlIdentityPermission : CodeAccessPermission, IBuiltInPermission {
39 private const int version = 1;
43 public UrlIdentityPermission (PermissionState state)
45 // false == do not allow Unrestricted for Identity Permissions
46 CheckPermissionState (state, false);
50 public UrlIdentityPermission (string site)
53 throw new ArgumentNullException ("site");
59 set { url = ((value == null) ? String.Empty : value); }
61 public override IPermission Copy ()
64 return new UrlIdentityPermission (PermissionState.None);
67 return new UrlIdentityPermission (url);
70 public override void FromXml (SecurityElement esd)
72 // General validation in CodeAccessPermission
73 CheckSecurityElement (esd, "esd", 1, 1);
74 // Note: we do not (yet) care about the return value
75 // as we only accept version 1 (min/max values)
77 string u = esd.Attribute ("Url");
84 public override IPermission Intersect (IPermission target)
86 // if one permission is null (object or url) then there's no intersection
87 // if both are null then intersection is null
88 UrlIdentityPermission uip = Cast (target);
89 if ((uip == null) || (IsEmpty ()))
91 if (Match (uip.url)) {
92 // longest form is the intersection
93 if (url.Length > uip.url.Length)
101 public override bool IsSubsetOf (IPermission target)
103 UrlIdentityPermission uip = Cast (target);
111 // here Match wouldn't work as it is bidirectional
112 int wildcard = uip.url.LastIndexOf ('*');
114 wildcard = uip.url.Length; // exact match
116 return (String.Compare (url, 0, uip.url, 0, wildcard, true, CultureInfo.InvariantCulture) == 0);
119 public override SecurityElement ToXml ()
121 SecurityElement se = Element (version);
123 se.AddAttribute ("Url", url);
127 public override IPermission Union (IPermission target)
129 UrlIdentityPermission uip = Cast (target);
132 if (IsEmpty () && uip.IsEmpty ())
138 if (Match (uip.url)) {
139 // shortest form is the union
140 if (url.Length < uip.url.Length)
145 throw new ArgumentException (Locale.GetText (
146 "Cannot union two different urls."), "target");
149 // IBuiltInPermission
150 int IBuiltInPermission.GetTokenIndex ()
152 return (int) BuiltInToken.UrlIdentity;
157 private bool IsEmpty ()
159 return ((url == null) || (url.Length == 0));
162 private UrlIdentityPermission Cast (IPermission target)
167 UrlIdentityPermission uip = (target as UrlIdentityPermission);
169 ThrowInvalidPermission (target, typeof (UrlIdentityPermission));
175 private bool Match (string target)
177 if ((url == null) || (target == null))
180 int wcu = url.LastIndexOf ('*');
181 int wct = target.LastIndexOf ('*');
182 int length = Int32.MaxValue;
184 if ((wcu == -1) && (wct == -1)) {
185 // no wildcard, this is an exact match
186 length = Math.Max (url.Length, target.Length);
188 else if (wcu == -1) {
189 // only "this" has a wildcard, use it
192 else if (wct == -1) {
193 // only "target" has a wildcard, use it
197 // both have wildcards, partial match with the smallest
198 length = Math.Min (wcu, wct);
201 return (String.Compare (url, 0, target, 0, length, true, CultureInfo.InvariantCulture) == 0);