Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Security / ReadOnlyPermissionSet.cs / 1305376 / ReadOnlyPermissionSet.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== //[....] // using System; using System.Collections; using System.Diagnostics.Contracts; using System.Runtime.Serialization; namespace System.Security { ////// Read only permission sets are created from explicit XML and cannot be modified after creation time. /// This allows us to round trip the permission set to the same XML that it was originally created /// from - which allows permission sets to be created from XML representing a permission set in a /// previous version of the framework to be deserialized on the current version while still /// serializing back to XML that makes sense on the original framework version. /// /// Note that while we protect against modifications of the permission set itself (such as adding or /// removing permissions), we do not make any attempt to guard against modification to the permissions /// which are members of the set. Permission accesor APIs always return a copy of the permission in /// question, although it may be mutable depending upon the permission class. If it is mutable, users /// will only be modifing a copy of the permission, and not modifying the state of the /// ReadOnlyPermissionSet. /// [Serializable] public sealed class ReadOnlyPermissionSet : PermissionSet { private SecurityElement m_originXml; [NonSerialized] private bool m_deserializing; public ReadOnlyPermissionSet(SecurityElement permissionSetXml) { if (permissionSetXml == null) throw new ArgumentNullException("permissionSetXml"); m_originXml = permissionSetXml.Copy(); base.FromXml(m_originXml); } [OnDeserializing] private void OnDeserializing(StreamingContext ctx) { m_deserializing = true; } [OnDeserialized] private void OnDeserialized(StreamingContext ctx) { m_deserializing = false; } public override bool IsReadOnly { get { return true; } } public override PermissionSet Copy() { return new ReadOnlyPermissionSet(m_originXml); } public override SecurityElement ToXml() { return m_originXml.Copy(); } // // Permission access methods - since modification to a permission would result in modifying the // underlying permission set, we always ensure that a copy of the permission is returned rather than // the permission itself. // protected override IEnumerator GetEnumeratorImpl() { return new ReadOnlyPermissionSetEnumerator(base.GetEnumeratorImpl()); } protected override IPermission GetPermissionImpl(Type permClass) { IPermission permission = base.GetPermissionImpl(permClass); return permission != null ? permission.Copy() : null; } // // Permission set mutation methods - all of these simply reject the attempt to modify the permission // set by throwing an InvalidOperationException // protected override IPermission AddPermissionImpl(IPermission perm) { throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_ModifyROPermSet")); } public override void FromXml(SecurityElement et) { // PermissionSet uses FromXml when it deserializes itself - so if we're deserializing, let // the base type recreate its state, otherwise it is invalid to modify a read only permission set // with a FromXml call. if (m_deserializing) { base.FromXml(et); } else { throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_ModifyROPermSet")); } } protected override IPermission RemovePermissionImpl(Type permClass) { throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_ModifyROPermSet")); } protected override IPermission SetPermissionImpl(IPermission perm) { throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_ModifyROPermSet")); } } ////// Class to enumerate permissions of a read only permission set - returning only copies of the /// permissions in the underlying permission set. /// internal sealed class ReadOnlyPermissionSetEnumerator : IEnumerator { private IEnumerator m_permissionSetEnumerator; internal ReadOnlyPermissionSetEnumerator(IEnumerator permissionSetEnumerator) { Contract.Assert(permissionSetEnumerator != null); m_permissionSetEnumerator = permissionSetEnumerator; } public object Current { get { IPermission currentPermission = m_permissionSetEnumerator.Current as IPermission; return currentPermission != null ? currentPermission.Copy() : null; } } public bool MoveNext() { return m_permissionSetEnumerator.MoveNext(); } public void Reset() { m_permissionSetEnumerator.Reset(); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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