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 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;
32 namespace System.Security.Permissions {
35 public sealed class UrlIdentityPermission : CodeAccessPermission, IBuiltInPermission {
37 private const int version = 1;
41 public UrlIdentityPermission (PermissionState state)
43 // false == do not allow Unrestricted for Identity Permissions
44 CheckPermissionState (state, false);
50 public UrlIdentityPermission (string site)
53 throw new ArgumentNullException ("site");
61 throw new NullReferenceException ("Url");
67 throw new ArgumentNullException ("Url");
72 public override IPermission Copy ()
76 return new UrlIdentityPermission (PermissionState.None);
78 throw new NullReferenceException ("Url");
82 return new UrlIdentityPermission (url);
85 public override void FromXml (SecurityElement esd)
87 // General validation in CodeAccessPermission
88 CheckSecurityElement (esd, "esd", 1, 1);
89 // Note: we do not (yet) care about the return value
90 // as we only accept version 1 (min/max values)
92 string u = esd.Attribute ("Url");
99 public override IPermission Intersect (IPermission target)
101 // if one permission is null (object or url) then there's no intersection
102 // if both are null then intersection is null
103 UrlIdentityPermission uip = Cast (target);
104 if ((uip == null) || (IsEmpty ()))
106 if (Match (uip.url)) {
107 // longest form is the intersection
108 if (url.Length > uip.url.Length)
116 public override bool IsSubsetOf (IPermission target)
118 UrlIdentityPermission uip = Cast (target);
126 // here Match wouldn't work as it is bidirectional
127 int wildcard = uip.url.LastIndexOf ('*');
129 wildcard = uip.url.Length; // exact match
131 return (String.Compare (url, 0, uip.url, 0, wildcard, true, CultureInfo.InvariantCulture) == 0);
134 public override SecurityElement ToXml ()
136 SecurityElement se = Element (version);
138 se.AddAttribute ("Url", url);
142 public override IPermission Union (IPermission target)
144 UrlIdentityPermission uip = Cast (target);
147 if (IsEmpty () && uip.IsEmpty ())
153 if (Match (uip.url)) {
154 // shortest form is the union
155 if (url.Length < uip.url.Length)
161 throw new ArgumentException (Locale.GetText (
162 "Cannot union two different urls."), "target");
168 // IBuiltInPermission
169 int IBuiltInPermission.GetTokenIndex ()
171 return (int) BuiltInToken.UrlIdentity;
176 private bool IsEmpty ()
178 return ((url == null) || (url.Length == 0));
181 private UrlIdentityPermission Cast (IPermission target)
186 UrlIdentityPermission uip = (target as UrlIdentityPermission);
188 ThrowInvalidPermission (target, typeof (UrlIdentityPermission));
194 private bool Match (string target)
196 if ((url == null) || (target == null))
199 int wcu = url.LastIndexOf ('*');
200 int wct = target.LastIndexOf ('*');
201 int length = Int32.MaxValue;
203 if ((wcu == -1) && (wct == -1)) {
204 // no wildcard, this is an exact match
205 length = Math.Max (url.Length, target.Length);
207 else if (wcu == -1) {
208 // only "this" has a wildcard, use it
211 else if (wct == -1) {
212 // only "target" has a wildcard, use it
216 // both have wildcards, partial match with the smallest
217 length = Math.Min (wcu, wct);
220 return (String.Compare (url, 0, target, 0, length, true, CultureInfo.InvariantCulture) == 0);