Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / CompMod / System / Security / Permissions / AspNetHostingPermission.cs / 1 / AspNetHostingPermission.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web { using System.Security; using System.Security.Permissions; using System.Globalization; //NOTE: While AspNetHostingPermissionAttribute resides in System.DLL, // no classes from that DLL are able to make declarative usage of AspNetHostingPermission. [Serializable] public enum AspNetHostingPermissionLevel { None = 100, Minimal = 200, Low = 300, Medium = 400, High = 500, Unrestricted = 600 } [AttributeUsage(AttributeTargets.All, AllowMultiple=true, Inherited=false )] [Serializable] sealed public class AspNetHostingPermissionAttribute : CodeAccessSecurityAttribute { AspNetHostingPermissionLevel _level; public AspNetHostingPermissionAttribute ( SecurityAction action ) : base( action ) { _level = AspNetHostingPermissionLevel.None; } public AspNetHostingPermissionLevel Level { get { return _level; } set { AspNetHostingPermission.VerifyAspNetHostingPermissionLevel(value, "Level"); _level = value; } } public override IPermission CreatePermission() { if (Unrestricted) { return new AspNetHostingPermission(PermissionState.Unrestricted); } else { return new AspNetHostingPermission(_level); } } } ////// [Serializable] public sealed class AspNetHostingPermission : CodeAccessPermission, IUnrestrictedPermission { AspNetHostingPermissionLevel _level; static internal void VerifyAspNetHostingPermissionLevel(AspNetHostingPermissionLevel level, string arg) { switch (level) { case AspNetHostingPermissionLevel.Unrestricted: case AspNetHostingPermissionLevel.High: case AspNetHostingPermissionLevel.Medium: case AspNetHostingPermissionLevel.Low: case AspNetHostingPermissionLevel.Minimal: case AspNetHostingPermissionLevel.None: break; default: throw new ArgumentException(arg); } } ////// ////// public AspNetHostingPermission(PermissionState state) { switch (state) { case PermissionState.Unrestricted: _level = AspNetHostingPermissionLevel.Unrestricted; break; case PermissionState.None: _level = AspNetHostingPermissionLevel.None; break; default: throw new ArgumentException(SR.GetString(SR.InvalidArgument, state.ToString(), "state")); } } public AspNetHostingPermission(AspNetHostingPermissionLevel level) { VerifyAspNetHostingPermissionLevel(level, "level"); _level = level; } public AspNetHostingPermissionLevel Level { get { return _level; } set { VerifyAspNetHostingPermissionLevel(value, "Level"); _level = value; } } // IUnrestrictedPermission interface methods ////// Creates a new instance of the System.Net.AspNetHostingPermission /// class that passes all demands or that fails all demands. /// ////// public bool IsUnrestricted() { return _level == AspNetHostingPermissionLevel.Unrestricted; } // IPermission interface methods ////// Checks the overall permission state of the object. /// ////// public override IPermission Copy () { return new AspNetHostingPermission(_level); } ////// Creates a copy of a System.Net.AspNetHostingPermission /// ////// public override IPermission Union(IPermission target) { if (target == null) { return Copy(); } if (target.GetType() != typeof(AspNetHostingPermission)) { throw new ArgumentException(SR.GetString(SR.InvalidArgument, target == null ? "null" : target.ToString(), "target")); } AspNetHostingPermission other = (AspNetHostingPermission) target; if (Level >= other.Level) { return new AspNetHostingPermission(Level); } else { return new AspNetHostingPermission(other.Level); } } ///Returns the logical union between two System.Net.AspNetHostingPermission instances. ////// public override IPermission Intersect(IPermission target) { if (target == null) { return null; } if (target.GetType() != typeof(AspNetHostingPermission)) { throw new ArgumentException(SR.GetString(SR.InvalidArgument, target == null ? "null" : target.ToString(), "target")); } AspNetHostingPermission other = (AspNetHostingPermission) target; if (Level <= other.Level) { return new AspNetHostingPermission(Level); } else { return new AspNetHostingPermission(other.Level); } } ///Returns the logical intersection between two System.Net.AspNetHostingPermission instances. ////// public override bool IsSubsetOf(IPermission target) { if (target == null) { return _level == AspNetHostingPermissionLevel.None; } if (target.GetType() != typeof(AspNetHostingPermission)) { throw new ArgumentException(SR.GetString(SR.InvalidArgument, target == null ? "null" : target.ToString(), "target")); } AspNetHostingPermission other = (AspNetHostingPermission) target; return Level <= other.Level; } ///Compares two System.Net.AspNetHostingPermission instances. ////// public override void FromXml(SecurityElement securityElement) { if (securityElement == null) { throw new ArgumentNullException(SR.GetString(SR.AspNetHostingPermissionBadXml,"securityElement")); } if (!securityElement.Tag.Equals("IPermission")) { throw new ArgumentException(SR.GetString(SR.AspNetHostingPermissionBadXml,"securityElement")); } string className = securityElement.Attribute("class"); if (className == null) { throw new ArgumentException(SR.GetString(SR.AspNetHostingPermissionBadXml,"securityElement")); } if (className.IndexOf(this.GetType().FullName, StringComparison.Ordinal) < 0) { throw new ArgumentException(SR.GetString(SR.AspNetHostingPermissionBadXml,"securityElement")); } string version = securityElement.Attribute("version"); if (string.Compare(version, "1", StringComparison.OrdinalIgnoreCase) != 0) { throw new ArgumentException(SR.GetString(SR.AspNetHostingPermissionBadXml,"version")); } string level = securityElement.Attribute("Level"); if (level == null) { _level = AspNetHostingPermissionLevel.None; } else { _level = (AspNetHostingPermissionLevel) Enum.Parse(typeof(AspNetHostingPermissionLevel), level); } } ////// public override SecurityElement ToXml() { SecurityElement securityElement = new SecurityElement("IPermission"); securityElement.AddAttribute("class", this.GetType().FullName + ", " + this.GetType().Module.Assembly.FullName.Replace( '\"', '\'' )); securityElement.AddAttribute("version", "1" ); securityElement.AddAttribute("Level", Enum.GetName(typeof(AspNetHostingPermissionLevel), _level)); if (IsUnrestricted()) { securityElement.AddAttribute("Unrestricted", "true"); } return securityElement; } } }[To be supplied.] ///
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