Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / SystemNet / Net / PeerToPeer / Collaboration / PeerCollaborationPermission.cs / 1305376 / PeerCollaborationPermission.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Net.PeerToPeer.Collaboration { using System.Security; using System.Security.Permissions; using System.Globalization; ////// PeerCollaborationPermissionAttribute atrribute /// [AttributeUsage(AttributeTargets.Method | AttributeTargets.Constructor | AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Assembly, AllowMultiple = true, Inherited = false)] [Serializable()] public sealed class PeerCollaborationPermissionAttribute : CodeAccessSecurityAttribute { ////// Just call base constructor /// /// public PeerCollaborationPermissionAttribute(SecurityAction action) : base(action) { } ////// As required by the SecurityAttribute class. /// ///public override IPermission CreatePermission() { if (Unrestricted){ return new PeerCollaborationPermission(PermissionState.Unrestricted); } else{ return new PeerCollaborationPermission(PermissionState.None); } } } /// /// Currently we only support two levels - Unrestrictred or none /// [Serializable] public sealed class PeerCollaborationPermission : CodeAccessPermission, IUnrestrictedPermission { private bool m_noRestriction; internal static readonly PeerCollaborationPermission UnrestrictedPeerCollaborationPermission = new PeerCollaborationPermission(PermissionState.Unrestricted); ////// public PeerCollaborationPermission(PermissionState state) { m_noRestriction = (state == PermissionState.Unrestricted); } internal PeerCollaborationPermission(bool free) { m_noRestriction = free; } // IUnrestrictedPermission interface methods ////// Creates a new instance of the ////// class that passes all demands or that fails all demands. /// /// public bool IsUnrestricted() { return m_noRestriction; } // IPermission interface methods ////// Checks the overall permission state of the object. /// ////// public override IPermission Copy() { if (m_noRestriction) return new PeerCollaborationPermission(true); else return new PeerCollaborationPermission(false); } ////// Creates a copy of a ///instance. /// /// public override IPermission Union(IPermission target) { // Pattern suggested by Security engine if (target == null){ return this.Copy(); } PeerCollaborationPermission other = target as PeerCollaborationPermission; if (other == null){ throw new ArgumentException(SR.GetString(SR.Collab_PermissionUnionError), "target"); } return new PeerCollaborationPermission(m_noRestriction || other.m_noRestriction); } ///Returns the logical union between two ///instances. /// public override IPermission Intersect(IPermission target) { // Pattern suggested by Security engine if (target == null){ return null; } PeerCollaborationPermission other = target as PeerCollaborationPermission; if (other == null){ throw new ArgumentException(SR.GetString(SR.Collab_PermissionIntersectError), "target"); } // return null if resulting permission is restricted and empty // Hence, the only way for a bool permission will be. if (this.m_noRestriction && other.m_noRestriction){ return new PeerCollaborationPermission(true); } return null; } ///Returns the logical intersection between two ///instances. /// public override bool IsSubsetOf(IPermission target) { // Pattern suggested by Security engine if (target == null){ return m_noRestriction == false; } PeerCollaborationPermission other = target as PeerCollaborationPermission; if (other == null){ throw new ArgumentException(SR.GetString(SR.Collab_BadPermissionTarget), "target"); } //Here is the matrix of result based on m_noRestriction for me and she // me.noRestriction she.noRestriction me.isSubsetOf(she) // 0 0 1 // 0 1 1 // 1 0 0 // 1 1 1 return (!m_noRestriction || other.m_noRestriction); } ///Compares two ///instances. /// Copy from a security element /// /// public override void FromXml(SecurityElement e) { if (e == null){ throw new ArgumentNullException("e"); } // SecurityElement must be a permission element if (!e.Tag.Equals("IPermission")) { throw new ArgumentException(SR.GetString(SR.InvalidSecurityElem), "e"); } string className = e.Attribute("class"); // SecurityElement must be a permission element for this type if (className == null){ throw new ArgumentException(SR.GetString(SR.InvalidSecurityElemNoClass), "e"); } if (className.IndexOf(this.GetType().FullName, StringComparison.Ordinal) < 0){ throw new ArgumentException(SR.GetString(SR.InvalidSecurityElemNoType), "e"); } string str = e.Attribute("Unrestricted"); m_noRestriction = (str != null ? (0 == string.Compare(str, "true", StringComparison.OrdinalIgnoreCase)) : false); } ////// Copyto a security element /// ///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"); if (m_noRestriction){ securityElement.AddAttribute("Unrestricted", "true"); } return securityElement; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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