mcs/class/System/System.Net/WebPermission.cs

   1 //
   2 // System.Net.WebPermission.cs
   3 //
   4 // Author:
   5 //   Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   6 //   (based on SocketPermission.cs)
   7 //
   8 // (C) 2003 Andreas Nahr
   9 //
  10
  11 //
  12 // Permission is hereby granted, free of charge, to any person obtaining
  13 // a copy of this software and associated documentation files (the
  14 // "Software"), to deal in the Software without restriction, including
  15 // without limitation the rights to use, copy, modify, merge, publish,
  16 // distribute, sublicense, and/or sell copies of the Software, and to
  17 // permit persons to whom the Software is furnished to do so, subject to
  18 // the following conditions:
  19 //
  20 // The above copyright notice and this permission notice shall be
  21 // included in all copies or substantial portions of the Software.
  22 //
  23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  27 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  28 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  30 //
  31
  32 using System;
  33 using System.Collections;
  34 using System.Security;
  35 using System.Security.Permissions;
  36 using System.Text.RegularExpressions;
  37
  38 namespace System.Net {
  39
  40         internal enum WebPermissionInfoType {
  41                 InfoString,
  42                 InfoUnexecutedRegex,
  43                 InfoRegex,
  44         }
  45
  46         internal class WebPermissionInfo {
  47                 WebPermissionInfoType _type;
  48                 object _info;
  49
  50                 public WebPermissionInfo (WebPermissionInfoType type, string info)
  51                 {
  52                         _type = type;
  53                         _info = (string) info;
  54                 }
  55
  56                 public WebPermissionInfo (Regex regex)
  57                 {
  58                         _type = WebPermissionInfoType.InfoRegex;
  59                         _info = (object) regex;
  60                 }
  61
  62                 public string Info {
  63                         get {
  64                                 if (_type == WebPermissionInfoType.InfoRegex)
  65                                         return null;
  66                                 return (string) _info;
  67                         }
  68                 }
  69         }
  70
  71         // (based on SocketPermission.cs - Please look there to implement missing members!)
  72         [MonoTODO ("Most private members that include functionallity are not implemented!")]
  73         [Serializable]
  74         public sealed class WebPermission : CodeAccessPermission, IUnrestrictedPermission
  75         {
  76                 // Fields
  77                 ArrayList m_acceptList = new ArrayList ();
  78                 ArrayList m_connectList = new ArrayList ();
  79                 bool m_noRestriction = false;
  80
  81                 // Constructors
  82                 public WebPermission () : base ()
  83                 {
  84                 }
  85
  86                 public WebPermission (PermissionState state) : base ()
  87                 {
  88                         m_noRestriction = (state == PermissionState.Unrestricted);
  89                 }
  90
  91                 public WebPermission (NetworkAccess access, string uriString) : base ()
  92                 {
  93                         AddPermission (access, uriString);
  94                 }
  95
  96                 public WebPermission (NetworkAccess access, Regex uriRegex) : base ()
  97                 {
  98                         AddPermission (access, uriRegex);
  99                 }
 100
 101                 // Properties
 102                 public IEnumerator AcceptList {
 103                         get { return m_acceptList.GetEnumerator (); }
 104                 }
 105
 106                 public IEnumerator ConnectList {
 107                         get { return m_connectList.GetEnumerator (); }
 108                 }
 109
 110                 // Methods
 111
 112                 public void AddPermission (NetworkAccess access, string uriString)
 113                 {
 114                         WebPermissionInfo info = new WebPermissionInfo (WebPermissionInfoType.InfoString, uriString);
 115                         AddPermission (access, info);
 116                 }
 117
 118                 public void AddPermission (NetworkAccess access, Regex uriRegex)
 119                 {
 120                         WebPermissionInfo info = new WebPermissionInfo (uriRegex);
 121                         AddPermission (access, info);
 122                 }
 123
 124                 internal void AddPermission (NetworkAccess access, WebPermissionInfo info)
 125                 {
 126                         switch (access) {
 127                                 case NetworkAccess.Accept:
 128                                         m_acceptList.Add (info);
 129                                         break;
 130                                 case NetworkAccess.Connect:
 131                                         m_connectList.Add (info);
 132                                         break;
 133                                 default:
 134                                         string msg = Locale.GetText ("Unknown NetworkAccess value {0}.");
 135                                         throw new ArgumentException (String.Format (msg, access), "access");
 136                         }
 137                 }
 138
 139                 public override IPermission Copy ()
 140                 {
 141                         WebPermission permission;
 142                         permission = new WebPermission (m_noRestriction ?
 143                                                 PermissionState.Unrestricted :
 144                                                 PermissionState.None);
 145
 146                         // as EndpointPermission's are immutable it's safe to do a shallow copy.
 147                         permission.m_connectList = (ArrayList)
 148                         this.m_connectList.Clone ();
 149                         permission.m_acceptList = (ArrayList) this.m_acceptList.Clone ();
 150                         return permission;
 151                 }
 152
 153                 public override IPermission Intersect (IPermission target)
 154                 {
 155                         if (target == null)
 156                                 return null;
 157                         WebPermission perm = target as WebPermission;
 158                         if (perm == null)
 159                                 throw new ArgumentException ("Argument not of type WebPermission");
 160                         if (m_noRestriction)
 161                                 return IntersectEmpty (perm) ? null : perm.Copy ();
 162                         if (perm.m_noRestriction)
 163                                 return IntersectEmpty (this) ? null : this.Copy ();
 164                         WebPermission newperm = new WebPermission (PermissionState.None);
 165                         Intersect (this.m_connectList, perm.m_connectList, newperm.m_connectList);
 166                         Intersect (this.m_acceptList, perm.m_acceptList, newperm.m_acceptList);
 167                         return IntersectEmpty (newperm) ? null : newperm;
 168                 }
 169
 170                 private bool IntersectEmpty (WebPermission permission)
 171                 {
 172                         return !permission.m_noRestriction &&
 173                                (permission.m_connectList.Count == 0) &&
 174                                (permission.m_acceptList.Count == 0);
 175                 }
 176
 177                 [MonoTODO]
 178                 private void Intersect (ArrayList list1, ArrayList list2, ArrayList result)
 179                 {
 180                         throw new NotImplementedException ();
 181                 }
 182
 183                 public override bool IsSubsetOf (IPermission target)
 184                 {
 185                         if (target == null)
 186                                 return (!m_noRestriction && m_connectList.Count == 0 && m_acceptList.Count == 0);
 187                         WebPermission perm = target as WebPermission;
 188                         if (perm == null)
 189                                 throw new ArgumentException ("Parameter target must be of type WebPermission");
 190                         if (perm.m_noRestriction)
 191                                 return true;
 192                         if (this.m_noRestriction)
 193                                 return false;
 194                         if (this.m_acceptList.Count == 0 && this.m_connectList.Count == 0)
 195                                 return true;
 196                         if (perm.m_acceptList.Count == 0 && perm.m_connectList.Count == 0)
 197                                 return false;
 198                         return IsSubsetOf (this.m_connectList, perm.m_connectList)
 199                             && IsSubsetOf (this.m_acceptList, perm.m_acceptList);
 200                 }
 201
 202
 203                 [MonoTODO]
 204                 private bool IsSubsetOf (ArrayList list1, ArrayList list2)
 205                 {
 206                         throw new NotImplementedException ();
 207                 }
 208
 209                 public bool IsUnrestricted ()
 210                 {
 211                         return m_noRestriction;
 212                 }
 213
 214                 public override SecurityElement ToXml ()
 215                 {
 216                         SecurityElement root = new SecurityElement ("IPermission");
 217                         root.AddAttribute ("class", this.GetType ().AssemblyQualifiedName);
 218                         root.AddAttribute ("version", "1");
 219                         if (m_noRestriction) {
 220                                 root.AddAttribute ("Unrestricted", "true");
 221                                 return root;
 222                         }
 223                         if (this.m_connectList.Count > 0)
 224                                 ToXml (root, "ConnectAccess", m_connectList.GetEnumerator ());
 225                         if (this.m_acceptList.Count > 0)
 226                                 ToXml (root, "AcceptAccess", m_acceptList.GetEnumerator ());
 227                         return root;
 228                 }
 229
 230                 private void ToXml (SecurityElement root, string childName, IEnumerator enumerator)
 231                 {
 232                         SecurityElement child = new SecurityElement (childName, null);
 233
 234                         root.AddChild (child);
 235                         while (enumerator.MoveNext ()){
 236                                 WebPermissionInfo x = enumerator.Current as WebPermissionInfo;
 237
 238                                 if (x == null) continue;
 239
 240                                 SecurityElement uri = new SecurityElement ("URI");
 241                                 uri.AddAttribute ("uri", x.Info);
 242                                 child.AddChild (uri);
 243                         }
 244                 }
 245
 246                 public override void FromXml (SecurityElement securityElement)
 247                 {
 248                         if (securityElement == null)
 249                                 throw new ArgumentNullException ("securityElement");
 250
 251                         // LAMESPEC: it says to throw an ArgumentNullException in this case
 252                         if (securityElement.Tag != "IPermission")
 253                                 throw new ArgumentException ("securityElement");
 254
 255                         string unrestricted = securityElement.Attribute ("Unrestricted");
 256                         if (unrestricted != null) {
 257                                 this.m_noRestriction = (String.Compare (unrestricted, "true", true) == 0);
 258                                 if (this.m_noRestriction)
 259                                         return;
 260                         }
 261                         this.m_noRestriction = false;
 262                         this.m_connectList = new ArrayList ();
 263                         this.m_acceptList = new ArrayList ();
 264                         ArrayList children = securityElement.Children;
 265                         foreach (SecurityElement child in children) {
 266                                 if (child.Tag == "ConnectAccess")
 267                                         FromXml (child.Children, NetworkAccess.Connect);
 268                                 else if (child.Tag == "AcceptAccess")
 269                                         FromXml (child.Children, NetworkAccess.Accept);
 270                         }
 271                 }
 272
 273                 private void FromXml (ArrayList endpoints, NetworkAccess access)
 274                 {
 275                         throw new NotImplementedException ();
 276                 }
 277
 278                 public override IPermission Union (IPermission target)
 279                 {
 280                         // LAMESPEC: according to spec we should throw an
 281                         // exception when target is null. We'll follow the
 282                         // behaviour of MS.Net instead of the spec, also
 283                         // because it matches the Intersect behaviour.
 284
 285                         if (target == null)
 286                                 return null;
 287                                 // throw new ArgumentNullException ("target");
 288
 289                         WebPermission perm = target as WebPermission;
 290                         if (perm == null)
 291                                 throw new ArgumentException ("Argument not of type WebPermission");
 292                         if (this.m_noRestriction || perm.m_noRestriction)
 293                                 return new WebPermission (PermissionState.Unrestricted);
 294
 295                         WebPermission copy = (WebPermission) perm.Copy ();
 296                         copy.m_acceptList.InsertRange (copy.m_acceptList.Count, this.m_acceptList);
 297                         copy.m_connectList.InsertRange (copy.m_connectList.Count, this.m_connectList);
 298
 299                         return copy;
 300                 }
 301         }
 302 }