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//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.IdentityModel.Selectors;
using System.IdentityModel.Tokens;
using System.Runtime;
using System.Security.Cryptography;
using System.Security.Authentication.ExtendedProtection;
using System.ServiceModel.Diagnostics;
namespace System.ServiceModel.Security.Tokens
{
/// <summary>
/// The ProviderBackedSecurityToken was added for the ChannelBindingToken work for Win7.
/// It is used to delay the resolution of a token until it is needed.
/// For the CBT, this delay is necessary as the CBT is not available until SecurityAppliedMessage.OnWriteMessage is called.
/// The CBT binds a token to the
/// </summary>
internal class ProviderBackedSecurityToken : SecurityToken
{
SecurityTokenProvider _tokenProvider;
// Double-checked locking pattern requires volatile for read/write synchronization
volatile SecurityToken _securityToken;
TimeSpan _timeout;
ChannelBinding _channelBinding;
object _lock;
/// <summary>
/// Constructor to create an instance of this class.
/// </summary>
/// <param name="securityToken">SecurityToken that represents the SecurityTokenElement element.</param>
public ProviderBackedSecurityToken( SecurityTokenProvider tokenProvider, TimeSpan timeout )
{
_lock = new object();
if ( tokenProvider == null )
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("tokenProvider"));
}
_tokenProvider = tokenProvider;
_timeout = timeout;
}
public SecurityTokenProvider TokenProvider
{
get { return _tokenProvider; }
}
public ChannelBinding ChannelBinding
{
set { _channelBinding = value; }
}
void ResolveSecurityToken()
{
if ( _securityToken == null )
{
lock ( _lock )
{
if ( _securityToken == null )
{
ClientCredentialsSecurityTokenManager.KerberosSecurityTokenProviderWrapper kerbTokenProvider = _tokenProvider
as ClientCredentialsSecurityTokenManager.KerberosSecurityTokenProviderWrapper;
if (kerbTokenProvider != null)
{
_securityToken = kerbTokenProvider.GetToken((new TimeoutHelper(_timeout)).RemainingTime(), _channelBinding);
}
else
{
_securityToken = _tokenProvider.GetToken((new TimeoutHelper(_timeout)).RemainingTime());
}
}
}
}
if ( _securityToken == null )
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError( new SecurityTokenException( SR.GetString( SR.SecurityTokenNotResolved, _tokenProvider.GetType().ToString() ) ) );
}
return;
}
public SecurityToken Token
{
get
{
if ( _securityToken == null )
{
ResolveSecurityToken();
}
return _securityToken;
}
}
public override string Id
{
get
{
if ( _securityToken == null )
{
ResolveSecurityToken();
}
return _securityToken.Id;
}
}
public override System.Collections.ObjectModel.ReadOnlyCollection<SecurityKey> SecurityKeys
{
get
{
if ( _securityToken == null )
{
ResolveSecurityToken();
}
return _securityToken.SecurityKeys;
}
}
public override DateTime ValidFrom
{
get
{
if ( _securityToken == null )
{
ResolveSecurityToken();
}
return _securityToken.ValidFrom;
}
}
public override DateTime ValidTo
{
get
{
if ( _securityToken == null )
{
ResolveSecurityToken();
}
return _securityToken.ValidTo;
}
}
}
}
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