Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Permissions / UIPermission.cs / 1 / UIPermission.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // UIPermission.cs // namespace System.Security.Permissions { using System; using System.Security; using System.Security.Util; using System.IO; using System.Runtime.Serialization; using System.Reflection; using System.Collections; using System.Globalization; [Serializable] [System.Runtime.InteropServices.ComVisible(true)] public enum UIPermissionWindow { // No window use allowed at all. NoWindows = 0x0, // Only allow safe subwindow use (for embedded components). SafeSubWindows = 0x01, // Safe top-level window use only (see specification for details). SafeTopLevelWindows = 0x02, // All windows and all event may be used. AllWindows = 0x03, } [Serializable] [System.Runtime.InteropServices.ComVisible(true)] public enum UIPermissionClipboard { // No clipboard access is allowed. NoClipboard = 0x0, // Paste from the same app domain only. OwnClipboard = 0x1, // Any clipboard access is allowed. AllClipboard = 0x2, } [System.Runtime.InteropServices.ComVisible(true)] [Serializable()] sealed public class UIPermission : CodeAccessPermission, IUnrestrictedPermission, IBuiltInPermission { //------------------------------------------------------ // // PRIVATE STATE DATA // //----------------------------------------------------- private UIPermissionWindow m_windowFlag; private UIPermissionClipboard m_clipboardFlag; //----------------------------------------------------- // // PUBLIC CONSTRUCTORS // //----------------------------------------------------- public UIPermission(PermissionState state) { if (state == PermissionState.Unrestricted) { SetUnrestricted( true ); } else if (state == PermissionState.None) { SetUnrestricted( false ); Reset(); } else { throw new ArgumentException(Environment.GetResourceString("Argument_InvalidPermissionState")); } } public UIPermission(UIPermissionWindow windowFlag, UIPermissionClipboard clipboardFlag ) { VerifyWindowFlag( windowFlag ); VerifyClipboardFlag( clipboardFlag ); m_windowFlag = windowFlag; m_clipboardFlag = clipboardFlag; } public UIPermission(UIPermissionWindow windowFlag ) { VerifyWindowFlag( windowFlag ); m_windowFlag = windowFlag; } public UIPermission(UIPermissionClipboard clipboardFlag ) { VerifyClipboardFlag( clipboardFlag ); m_clipboardFlag = clipboardFlag; } //------------------------------------------------------ // // PUBLIC ACCESSOR METHODS // //----------------------------------------------------- public UIPermissionWindow Window { set { VerifyWindowFlag(value); m_windowFlag = value; } get { return m_windowFlag; } } public UIPermissionClipboard Clipboard { set { VerifyClipboardFlag(value); m_clipboardFlag = value; } get { return m_clipboardFlag; } } //------------------------------------------------------ // // PRIVATE AND PROTECTED HELPERS FOR ACCESSORS AND CONSTRUCTORS // //------------------------------------------------------ private static void VerifyWindowFlag(UIPermissionWindow flag) { if (flag < UIPermissionWindow.NoWindows || flag > UIPermissionWindow.AllWindows) { throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Arg_EnumIllegalVal"), (int)flag)); } } private static void VerifyClipboardFlag(UIPermissionClipboard flag) { if (flag < UIPermissionClipboard.NoClipboard || flag > UIPermissionClipboard.AllClipboard) { throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Arg_EnumIllegalVal"), (int)flag)); } } private void Reset() { m_windowFlag = UIPermissionWindow.NoWindows; m_clipboardFlag = UIPermissionClipboard.NoClipboard; } private void SetUnrestricted( bool unrestricted ) { if (unrestricted) { m_windowFlag = UIPermissionWindow.AllWindows; m_clipboardFlag = UIPermissionClipboard.AllClipboard; } } #if false //----------------------------------------------------- // // OBJECT METHOD OVERRIDES // //------------------------------------------------------ public String ToString() { #if _DEBUG StringBuilder sb = new StringBuilder(); sb.Append("UIPermission("); if (IsUnrestricted()) { sb.Append("Unrestricted"); } else { sb.Append(m_stateNameTableWindow[m_windowFlag]); sb.Append(", "); sb.Append(m_stateNameTableClipboard[m_clipboardFlag]); } sb.Append(")"); return sb.ToString(); #else return super.ToString(); #endif } #endif //----------------------------------------------------- // // CODEACCESSPERMISSION IMPLEMENTATION // //----------------------------------------------------- public bool IsUnrestricted() { return m_windowFlag == UIPermissionWindow.AllWindows && m_clipboardFlag == UIPermissionClipboard.AllClipboard; } //----------------------------------------------------- // // IPERMISSION IMPLEMENTATION // //------------------------------------------------------ public override bool IsSubsetOf(IPermission target) { if (target == null) { // Only safe subset if this is empty return m_windowFlag == UIPermissionWindow.NoWindows && m_clipboardFlag == UIPermissionClipboard.NoClipboard; } try { UIPermission operand = (UIPermission)target; if (operand.IsUnrestricted()) return true; else if (this.IsUnrestricted()) return false; else return this.m_windowFlag <= operand.m_windowFlag && this.m_clipboardFlag <= operand.m_clipboardFlag; } catch (InvalidCastException) { throw new ArgumentException( String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Argument_WrongType"), this.GetType().FullName) ); } } public override IPermission Intersect(IPermission target) { if (target == null) { return null; } else if (!VerifyType(target)) { throw new ArgumentException( String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Argument_WrongType"), this.GetType().FullName) ); } UIPermission operand = (UIPermission)target; UIPermissionWindow isectWindowFlags = m_windowFlag < operand.m_windowFlag ? m_windowFlag : operand.m_windowFlag; UIPermissionClipboard isectClipboardFlags = m_clipboardFlag < operand.m_clipboardFlag ? m_clipboardFlag : operand.m_clipboardFlag; if (isectWindowFlags == UIPermissionWindow.NoWindows && isectClipboardFlags == UIPermissionClipboard.NoClipboard) return null; else return new UIPermission(isectWindowFlags, isectClipboardFlags); } public override IPermission Union(IPermission target) { if (target == null) { return this.Copy(); } else if (!VerifyType(target)) { throw new ArgumentException( String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Argument_WrongType"), this.GetType().FullName) ); } UIPermission operand = (UIPermission)target; UIPermissionWindow isectWindowFlags = m_windowFlag > operand.m_windowFlag ? m_windowFlag : operand.m_windowFlag; UIPermissionClipboard isectClipboardFlags = m_clipboardFlag > operand.m_clipboardFlag ? m_clipboardFlag : operand.m_clipboardFlag; if (isectWindowFlags == UIPermissionWindow.NoWindows && isectClipboardFlags == UIPermissionClipboard.NoClipboard) return null; else return new UIPermission(isectWindowFlags, isectClipboardFlags); } public override IPermission Copy() { return new UIPermission(this.m_windowFlag, this.m_clipboardFlag); } public override SecurityElement ToXml() { SecurityElement esd = CodeAccessPermission.CreatePermissionElement( this, "System.Security.Permissions.UIPermission" ); if (!IsUnrestricted()) { if (m_windowFlag != UIPermissionWindow.NoWindows) { esd.AddAttribute( "Window", Enum.GetName( typeof( UIPermissionWindow ), m_windowFlag ) ); } if (m_clipboardFlag != UIPermissionClipboard.NoClipboard) { esd.AddAttribute( "Clipboard", Enum.GetName( typeof( UIPermissionClipboard ), m_clipboardFlag ) ); } } else { esd.AddAttribute( "Unrestricted", "true" ); } return esd; } public override void FromXml(SecurityElement esd) { CodeAccessPermission.ValidateElement( esd, this ); if (XMLUtil.IsUnrestricted( esd )) { SetUnrestricted( true ); return; } m_windowFlag = UIPermissionWindow.NoWindows; m_clipboardFlag = UIPermissionClipboard.NoClipboard; String window = esd.Attribute( "Window" ); if (window != null) m_windowFlag = (UIPermissionWindow)Enum.Parse( typeof( UIPermissionWindow ), window ); String clipboard = esd.Attribute( "Clipboard" ); if (clipboard != null) m_clipboardFlag = (UIPermissionClipboard)Enum.Parse( typeof( UIPermissionClipboard ), clipboard ); } ///int IBuiltInPermission.GetTokenIndex() { return UIPermission.GetTokenIndex(); } internal static int GetTokenIndex() { return BuiltInPermissionIndex.UIPermissionIndex; } } }
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