Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / clipboard.cs / 2 / clipboard.cs
//----------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
// Description: Clipboard implementation to provide methods to place/get data from/to the system
// clipboard.
//
// See spec at [....]/uis/Data%20Transfer%20clipboard%20dragdrop/Avalon%20Clipboard.htm
//
// History:
// 05/09/2002 : [....] Created
// 06/16/2003 : [....] Moved to WCP
//
//---------------------------------------------------------------------------
using MS.Win32;
using MS.Internal;
using MS.Internal.PresentationCore; // SecurityHelper
using System.Collections.Specialized;
using System.IO;
using System.Security;
using System.Security.Permissions;
using System.ComponentModel;
using System.Runtime.InteropServices;
using System.Runtime.Serialization;
using System.Windows.Media.Imaging;
using System.Windows.Threading;
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;
using IComDataObject = System.Runtime.InteropServices.ComTypes.IDataObject;
namespace System.Windows
{
#region Clipboard class
///
/// Provides methods to place data on and retrieve data from the system clipboard.
/// This class cannot be inherited.
///
public static class Clipboard
{
//-----------------------------------------------------
//
// Public Methods
//
//-----------------------------------------------------
#region Public Methods
///
/// Clear the system clipboard which the clipboard is emptied.
/// SetDataObject.
///
///
/// Critical - access critical data (clipboard information)
/// PublicOk - Clearing the clipboard is not inherantly unsafe.
///
[SecurityCritical]
public static void Clear()
{
// Clear the system clipboard by calling OleSetClipboard with null parameter.
ThrowIfFailed(OleServicesContext.CurrentOleServicesContext.OleSetClipboard(null));
}
///
/// Return true if Clipboard contains the audio data. Otherwise, return false.
///
public static bool ContainsAudio()
{
return ContainsDataInternal(DataFormats.WaveAudio);
}
///
/// Return true if Clipboard contains the specified data format. Otherwise, return false.
///
public static bool ContainsData(string format)
{
if (format == null)
{
throw new ArgumentNullException("format");
}
if (format == string.Empty)
{
throw new ArgumentException(SR.Get(SRID.DataObject_EmptyFormatNotAllowed));
}
return ContainsDataInternal(format);
}
///
/// Return true if Clipboard contains the file drop list format. Otherwise, return false.
///
public static bool ContainsFileDropList()
{
return ContainsDataInternal(DataFormats.FileDrop);
}
///
/// Return true if Clipboard contains the image format. Otherwise, return false.
///
public static bool ContainsImage()
{
return ContainsDataInternal(DataFormats.Bitmap);
}
///
/// Return true if Clipboard contains the text data format which is unicode.
/// Otherwise, return false.
///
public static bool ContainsText()
{
return ContainsDataInternal(DataFormats.UnicodeText);
}
///
/// Return true if Clipboard contains the specified text data format which is unicode.
/// Otherwise, return false.
///
public static bool ContainsText(TextDataFormat format)
{
if (!DataFormats.IsValidTextDataFormat(format))
{
throw new InvalidEnumArgumentException("format", (int)format, typeof(TextDataFormat));
}
return ContainsDataInternal(DataFormats.ConvertToDataFormats(format));
}
///
/// Get audio data as Stream from Clipboard.
///
public static Stream GetAudioStream()
{
return GetDataInternal(DataFormats.WaveAudio) as Stream;
}
///
/// Get data for the specified data format from Clipboard.
///
public static object GetData(string format)
{
if (format == null)
{
throw new ArgumentNullException("format");
}
if (format == string.Empty)
{
throw new ArgumentException(SR.Get(SRID.DataObject_EmptyFormatNotAllowed));
}
return GetDataInternal(format);
}
///
/// Get the file drop list as StringCollection from Clipboard.
///
public static StringCollection GetFileDropList()
{
StringCollection fileDropListCollection;
string[] fileDropList;
fileDropListCollection = new StringCollection();
fileDropList = GetDataInternal(DataFormats.FileDrop) as string[];
if (fileDropList != null)
{
fileDropListCollection.AddRange(fileDropList);
}
return fileDropListCollection;
}
///
/// Get the image from Clipboard.
///
public static BitmapSource GetImage()
{
return GetDataInternal(DataFormats.Bitmap) as BitmapSource;
}
///
/// Get text from Clipboard.
///
public static string GetText()
{
return GetText(TextDataFormat.UnicodeText);
}
///
/// Get text from Clipboard.
///
public static string GetText(TextDataFormat format)
{
if (!DataFormats.IsValidTextDataFormat(format))
{
throw new InvalidEnumArgumentException("format", (int)format, typeof(TextDataFormat));
}
string text;
text = (string)GetDataInternal(DataFormats.ConvertToDataFormats(format));
if (text != null)
{
return text;
}
return string.Empty;
}
///
/// Set the audio data to Clipboard.
///
public static void SetAudio(byte[] audioBytes)
{
if (audioBytes == null)
{
throw new ArgumentNullException("audioBytes");
}
SetAudio(new MemoryStream(audioBytes));
}
///
/// Set the audio data to Clipboard.
///
public static void SetAudio(Stream audioStream)
{
if (audioStream == null)
{
throw new ArgumentNullException("audioStream");
}
SetDataInternal(DataFormats.WaveAudio, audioStream);
}
///
/// Set the specified data to Clipboard.
///
public static void SetData(string format, object data)
{
if (format == null)
{
throw new ArgumentNullException("format");
}
if (format == string.Empty)
{
throw new ArgumentException(SR.Get(SRID.DataObject_EmptyFormatNotAllowed));
}
if (data == null)
{
throw new ArgumentNullException("data");
}
SetDataInternal(format, data);
}
///
/// Set the file drop list to Clipboard.
///
public static void SetFileDropList(StringCollection fileDropList)
{
if (fileDropList == null)
{
throw new ArgumentNullException("fileDropList");
}
if (fileDropList.Count == 0)
{
throw new ArgumentException(SR.Get(SRID.DataObject_FileDropListIsEmpty, fileDropList));
}
foreach (string fileDrop in fileDropList)
{
try
{
string filePath = Path.GetFullPath(fileDrop);
}
catch (ArgumentException)
{
throw new ArgumentException(SR.Get(SRID.DataObject_FileDropListHasInvalidFileDropPath, fileDropList));
}
}
string[] fileDropListStrings;
fileDropListStrings = new string[fileDropList.Count];
fileDropList.CopyTo(fileDropListStrings, 0);
SetDataInternal(DataFormats.FileDrop, fileDropListStrings);
}
///
/// Set the image data to Clipboard.
///
public static void SetImage(BitmapSource image)
{
if (image == null)
{
throw new ArgumentNullException("image");
}
SetDataInternal(DataFormats.Bitmap, image);
}
///
/// Set the text data to Clipboard.
///
public static void SetText(string text)
{
if (text == null)
{
throw new ArgumentNullException("text");
}
SetText(text, TextDataFormat.UnicodeText);
}
///
/// Set the text data to Clipboard.
///
public static void SetText(string text, TextDataFormat format)
{
if (text == null)
{
throw new ArgumentNullException("text");
}
if (!DataFormats.IsValidTextDataFormat(format))
{
throw new InvalidEnumArgumentException("format", (int)format, typeof(TextDataFormat));
}
SetDataInternal(DataFormats.ConvertToDataFormats(format), text);
}
///
/// Retrieves the data object that is currently on the system clipboard.
///
///
/// Callers must have UIPermission(UIPermissionClipboard.AllClipboard) to call this API.
///
///
/// Critical - access critical data (clipboard information)
/// PublicOk - demands appropriate permission (AllClipboard)
///
[SecurityCritical]
public static IDataObject GetDataObject()
{
SecurityHelper.DemandAllClipboardPermission();
return GetDataObjectInternal();
}
///
/// Determines whether the data object previously placed on the clipboard
/// by the SetDataObject is still on the clipboard.
///
///
/// Data object from the current containing clipboard which the caller
/// previously placed on the clipboard.
///
public static bool IsCurrent(IDataObject data)
{
bool bReturn;
if (data == null)
{
throw new ArgumentNullException("data");
}
bReturn = false;
if (data is IComDataObject)
{
int hr;
hr = OleServicesContext.CurrentOleServicesContext.OleIsCurrentClipboard((IComDataObject)data);
if (hr == NativeMethods.S_OK)
{
bReturn = true;
}
else if (!NativeMethods.Succeeded(hr))
{
throw new ExternalException("OleIsCurrentClipboard()", hr);
}
}
return bReturn;
}
///
/// Places nonpersistent data on the system clipboard.
///
///
/// The specific data to be on clipboard.
///
///
/// Callers must have UIPermission(UIPermissionClipboard.AllClipboard) to call this API.
///
///
/// Critical - access critical data (clipboard information)
/// PublicOk - demands appropriate permission (AllClipboard)
///
[SecurityCritical]
public static void SetDataObject(object data)
{
SecurityHelper.DemandAllClipboardPermission();
if (data == null)
{
throw new ArgumentNullException("data");
}
SetDataObject(data, false);
}
///
/// Places data on the system Clipboard and uses copy to specify whether the data
/// should remain on the Clipboard after the application exits.
///
///
/// The specific data to be on clipboard.
///
///
/// Specify whether the data should remain on the clipboard after the application exits.
///
///
/// Callers must have UIPermission(UIPermissionClipboard.AllClipboard) to call this API.
///
///
/// Critical - calls critical code (set clipboard), and potentially deals
/// with unmanaged pointers
/// PublicOk - Demands All Clipboard permissions
///
[SecurityCritical]
public static void SetDataObject(object data, bool copy)
{
SecurityHelper.DemandAllClipboardPermission();
CriticalSetDataObject(data,copy);
}
#endregion Public Methods
#region Internal Methods
//------------------------------------------------------
//
// Internal Methods
//
//-----------------------------------------------------
///
/// Places data on the system Clipboard and uses copy to specify whether the data
/// should remain on the Clipboard after the application exits.
///
///
/// The specific data to be on clipboard.
///
///
/// Specify whether the data should remain on the clipboard after the application exits.
///
///
/// Critical - calls critical code (set clipboard), and potentially deals
/// with unmanaged pointers
///
[SecurityCritical]
[FriendAccessAllowed]
internal static void CriticalSetDataObject(object data, bool copy)
{
if (data == null)
{
throw new ArgumentNullException("data");
}
if (data is DataObject)
{
ThrowIfFailed(OleServicesContext.CurrentOleServicesContext.OleSetClipboard((DataObject)data));
}
else if (data is IComDataObject)
{
SecurityHelper.DemandUnmanagedCode();
ThrowIfFailed(OleServicesContext.CurrentOleServicesContext.OleSetClipboard((IComDataObject)data));
}
else
{
ThrowIfFailed(OleServicesContext.CurrentOleServicesContext.OleSetClipboard(new DataObject(data)));
}
if (copy)
{
ThrowIfFailed(OleServicesContext.CurrentOleServicesContext.OleFlushClipboard());
}
}
///
/// Critical - access critical data (clipboard information)
/// TreatAsSafe: Returning a bool indicating whether there is data on the clipboard is ok
///
[SecurityCritical, SecurityTreatAsSafe]
[FriendAccessAllowed]
internal static bool IsClipboardPopulated()
{
bool isPopulated = false;
(new UIPermission(UIPermissionClipboard.AllClipboard)).Assert();//BlessedAssert
try
{
isPopulated = (GetDataObjectInternal() != null);
}
finally
{
UIPermission.RevertAssert();
}
return isPopulated;
}
#endregion Internal Methods
//------------------------------------------------------
//
// Private Methods
//
//------------------------------------------------------
#region Private Methods
///
/// Critical: This method calls into ExtractAppDomainPermissionSetMinusSiteOfOrigin this is used to make trust decision to
/// copy paste content and is hence important to be tracked. Also it asserts to get to data
///
[SecurityCritical]
private static bool IsDataObjectFromLessPriviligedApplicationDomain(IDataObject dataObjectToApply)
{
bool retVal = false;
object applicationTrust = null;
// Extract the permission set in case of xaml cut and paste
// extract permission set if it exists if not data came from full trust app and we do not care
bool isApplicationTrustFormatPresent = false;
isApplicationTrustFormatPresent = dataObjectToApply.GetDataPresent(DataFormats.ApplicationTrust, /*autoConvert:*/false);
if (isApplicationTrustFormatPresent)
{
applicationTrust = dataObjectToApply.GetData(DataFormats.ApplicationTrust, /*autoConvert:*/false);
}
if (applicationTrust != null)
{
string applicationTrustText = null;
// convert to string
applicationTrustText = applicationTrust.ToString();
// Convert string to permission set for getting permission set of source
PermissionSet permissionSetSource;
try
{
SecurityElement securityElement = SecurityElement.FromString(applicationTrustText);
permissionSetSource = new System.Security.PermissionSet(PermissionState.None);
permissionSetSource.FromXml(securityElement);
}
catch(XmlSyntaxException)
{
// This is the condition where we have Malformed XML in the clipboard for application trust
// here we will fail silently since we do not want to break arbitrary applications
// but since we cannot establish the validity of the application trust content we will fall back to
// whatever is more secure
return true;
}
//extract permission set for the current appdomain which is target
PermissionSet permissionSetDestination = SecurityHelper.ExtractAppDomainPermissionSetMinusSiteOfOrigin();
//Compare permissions sets
if (!permissionSetDestination.IsSubsetOf(permissionSetSource))
{
retVal = true; // in case target is not subset of source revert to unicode or text
}
}
return retVal;
}
///
/// Critical: This code extracts the DataObject from the clipboard
/// which can be used to sniff clipboard
///
[SecurityCritical]
private static IDataObject GetDataObjectInternal()
{
IDataObject dataObject;
IComDataObject oleDataObject;
oleDataObject = null;
ThrowIfFailed(OleServicesContext.CurrentOleServicesContext.OleGetClipboard(ref oleDataObject));
if (oleDataObject is IDataObject)
{
dataObject = (IDataObject)oleDataObject;
}
else if (oleDataObject != null)
{
dataObject = new DataObject(oleDataObject);
}
else
{
dataObject = null;
}
// We make this check outside of the loop independant of whether the data is ole data object or IDataObject
// Although one is unable to create an OleDataObject in partial trust we still need to ensure that if he did
// we strip the formats we care about by wrapping in ConstrainedDataObject
if (dataObject != null)
{
// this is the case we are concerend about where content comes from partial trust into full trust
// in the case where data contained is in one of the two formats: XAML or ApplicationTrust we return a wrapper
// that blocks access to these
if (IsDataObjectFromLessPriviligedApplicationDomain(dataObject) &&
(dataObject.GetDataPresent(DataFormats.Xaml, /*autoConvert:*/false) ||
dataObject.GetDataPresent(DataFormats.ApplicationTrust, /*autoConvert:*/false)))
{
// in this case we set the data object to be a wrapper data object that blocks off
// xaml or application trust formats if they exist
dataObject = new ConstrainedDataObject(dataObject);
}
}
return dataObject;
}
///
/// Query the specified data format from Clipboard.
///
private static bool ContainsDataInternal(string format)
{
IDataObject dataObject;
dataObject = Clipboard.GetDataObject();
if (dataObject != null)
{
bool autoConvert;
if (IsDataFormatAutoConvert(format))
{
autoConvert = true;
}
else
{
autoConvert = false;
}
return dataObject.GetDataPresent(format, autoConvert);
}
else
{
return false;
}
}
///
/// Get the specified format from Clipboard.
///
private static object GetDataInternal(string format)
{
IDataObject dataObject;
dataObject = Clipboard.GetDataObject();
if (dataObject != null)
{
bool autoConvert;
if (IsDataFormatAutoConvert(format))
{
autoConvert = true;
}
else
{
autoConvert = false;
}
return dataObject.GetData(format, autoConvert);
}
else
{
return null;
}
}
///
/// Set the specified data into Clipboard.
///
private static void SetDataInternal(string format, object data)
{
IDataObject dataObject;
bool autoConvert;
if (IsDataFormatAutoConvert(format))
{
autoConvert = true;
}
else
{
autoConvert = false;
}
dataObject = new DataObject();
dataObject.SetData(format, data, autoConvert);
Clipboard.SetDataObject(dataObject, /*copy*/true);
}
///
/// Check the auto convert for the specified data format.
///
private static bool IsDataFormatAutoConvert(string format)
{
bool autoConvert;
if (String.CompareOrdinal(format, DataFormats.FileDrop) == 0 ||
String.CompareOrdinal(format, DataFormats.Bitmap) == 0)
{
autoConvert = true;
}
else
{
autoConvert = false;
}
return autoConvert;
}
///
/// Throw the exception if hr isn't succeed.
///
///
/// Critical: This code calls into ThrowExceptionForHr which has a link demand
/// TreatAsSafe: The net effect is the same as throwing an excpetion from your app
///
[SecurityCritical, SecurityTreatAsSafe]
private static void ThrowIfFailed(int hr)
{
if (!NativeMethods.Succeeded(hr))
{
Marshal.ThrowExceptionForHR(hr);
}
}
#endregion Private Methods
}
#endregion Clipboard class
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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