/// <summary>
/// Performs a user impersonation based on a logon token.
/// </summary>
/// <param name="token"> The logon token. </param>
/// <param name="loadUserProfile"> Specifies whether the users profile is to be loaded. </param>
/// <param name="func"> The code to run under the impersonated user. </param>
/// <returns>
/// The return value from <paramref name="func" />.
/// </returns>
/// <exception cref="ArgumentNullException"> <paramref name="func" /> is null. </exception>
/// <exception cref="ArgumentException"> <paramref name="token" /> is zero. </exception>
/// <exception cref="SecurityException"> The current user does not have sufficient permissions. </exception>
/// <exception cref="Win32Exception">
/// The current user does not have sufficient permissions or the impersonation could not
/// be completed.
/// </exception>
public static Task <TResult> RunImpersonatedAsync <TResult> (IntPtr token, bool loadUserProfile,
ImpersonatedFuncAsync <TResult> func)
{
if (func == null)
{
throw new ArgumentNullException(nameof(func));
}
if (token == IntPtr.Zero)
{
throw new ArgumentException("The token is zero.", nameof(token));
}
Task <TResult> result = WindowsIdentity.RunImpersonatedAsync(new SafeAccessTokenHandle(token), async() =>
{
WindowsIdentity identity = null;
WindowsUserProfile profile = null;
try
{
identity = new WindowsIdentity(token);
if (loadUserProfile)
{
USERPROFILE profileInfo = new USERPROFILE();
profileInfo.dwSize = Marshal.SizeOf(profileInfo);
profileInfo.lpUserName = identity.Name;
profileInfo.dwFlags = 1;
bool loadSuccess = WindowsUser.LoadUserProfile(token, ref profileInfo);
if (!loadSuccess)
{
int errorCode = WindowsApi.GetLastErrorCode();
string errorMessage = WindowsApi.GetErrorMessage(errorCode);
throw new Win32Exception(errorCode, errorMessage);
}
profile = new WindowsUserProfile(profileInfo);
}
return(await func(token, identity, profile));
}
finally
{
if (profile != null)
{
WindowsUser.UnloadUserProfile(token, profile.NativeUserProfile.hProfile);
}
if (identity != null)
{
identity.Dispose();
}
}
});
return(result);
}
