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//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace System.IdentityModel.Selectors
{
using System.Collections.ObjectModel;
using System.IdentityModel.Configuration;
using System.IdentityModel.Tokens;
using System.Xml;
public abstract class SecurityTokenResolver : ICustomIdentityConfiguration
{
public SecurityToken ResolveToken(SecurityKeyIdentifier keyIdentifier)
{
if (keyIdentifier == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("keyIdentifier");
}
SecurityToken token;
if (!this.TryResolveTokenCore(keyIdentifier, out token))
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new InvalidOperationException(SR.GetString(SR.UnableToResolveTokenReference, keyIdentifier)));
}
return token;
}
public bool TryResolveToken(SecurityKeyIdentifier keyIdentifier, out SecurityToken token)
{
if (keyIdentifier == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("keyIdentifier");
}
return TryResolveTokenCore(keyIdentifier, out token);
}
public SecurityToken ResolveToken(SecurityKeyIdentifierClause keyIdentifierClause)
{
if (keyIdentifierClause == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("keyIdentifierClause");
}
SecurityToken token;
if (!this.TryResolveTokenCore(keyIdentifierClause, out token))
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new InvalidOperationException(SR.GetString(SR.UnableToResolveTokenReference, keyIdentifierClause)));
}
return token;
}
public bool TryResolveToken(SecurityKeyIdentifierClause keyIdentifierClause, out SecurityToken token)
{
if (keyIdentifierClause == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("keyIdentifierClause");
}
return this.TryResolveTokenCore(keyIdentifierClause, out token);
}
public SecurityKey ResolveSecurityKey(SecurityKeyIdentifierClause keyIdentifierClause)
{
if (keyIdentifierClause == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("keyIdentifierClause");
}
SecurityKey key;
if (!this.TryResolveSecurityKeyCore(keyIdentifierClause, out key))
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperWarning(new InvalidOperationException(SR.GetString(SR.UnableToResolveKeyReference, keyIdentifierClause)));
}
return key;
}
public bool TryResolveSecurityKey(SecurityKeyIdentifierClause keyIdentifierClause, out SecurityKey key)
{
if (keyIdentifierClause == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("keyIdentifierClause");
}
return this.TryResolveSecurityKeyCore(keyIdentifierClause, out key);
}
/// <summary>
/// Load custom configuration from Xml
/// </summary>
/// <param name="nodelist">Custom configuration elements</param>
public virtual void LoadCustomConfiguration(XmlNodeList nodelist)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new NotImplementedException(SR.GetString(SR.ID0023, this.GetType().AssemblyQualifiedName)));
}
// protected methods
protected abstract bool TryResolveTokenCore(SecurityKeyIdentifier keyIdentifier, out SecurityToken token);
protected abstract bool TryResolveTokenCore(SecurityKeyIdentifierClause keyIdentifierClause, out SecurityToken token);
protected abstract bool TryResolveSecurityKeyCore(SecurityKeyIdentifierClause keyIdentifierClause, out SecurityKey key);
public static SecurityTokenResolver CreateDefaultSecurityTokenResolver(ReadOnlyCollection<SecurityToken> tokens, bool canMatchLocalId)
{
return new SimpleTokenResolver(tokens, canMatchLocalId);
}
class SimpleTokenResolver : SecurityTokenResolver
{
ReadOnlyCollection<SecurityToken> tokens;
bool canMatchLocalId;
public SimpleTokenResolver(ReadOnlyCollection<SecurityToken> tokens, bool canMatchLocalId)
{
if (tokens == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("tokens");
this.tokens = tokens;
this.canMatchLocalId = canMatchLocalId;
}
protected override bool TryResolveSecurityKeyCore(SecurityKeyIdentifierClause keyIdentifierClause, out SecurityKey key)
{
if (keyIdentifierClause == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("keyIdentifierClause");
key = null;
for (int i = 0; i < this.tokens.Count; ++i)
{
SecurityKey securityKey = this.tokens[i].ResolveKeyIdentifierClause(keyIdentifierClause);
if (securityKey != null)
{
key = securityKey;
return true;
}
}
if (keyIdentifierClause is EncryptedKeyIdentifierClause)
{
EncryptedKeyIdentifierClause keyClause = (EncryptedKeyIdentifierClause)keyIdentifierClause;
SecurityKeyIdentifier keyIdentifier = keyClause.EncryptingKeyIdentifier;
if (keyIdentifier != null && keyIdentifier.Count > 0)
{
for (int i = 0; i < keyIdentifier.Count; i++)
{
SecurityKey unwrappingSecurityKey = null;
if (TryResolveSecurityKey(keyIdentifier[i], out unwrappingSecurityKey))
{
byte[] wrappedKey = keyClause.GetEncryptedKey();
string wrappingAlgorithm = keyClause.EncryptionMethod;
byte[] unwrappedKey = unwrappingSecurityKey.DecryptKey(wrappingAlgorithm, wrappedKey);
key = new InMemorySymmetricSecurityKey(unwrappedKey, false);
return true;
}
}
}
}
return key != null;
}
protected override bool TryResolveTokenCore(SecurityKeyIdentifier keyIdentifier, out SecurityToken token)
{
if (keyIdentifier == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("keyIdentifier");
token = null;
for (int i = 0; i < keyIdentifier.Count; ++i)
{
SecurityToken securityToken = ResolveSecurityToken(keyIdentifier[i]);
if (securityToken != null)
{
token = securityToken;
break;
}
}
return (token != null);
}
protected override bool TryResolveTokenCore(SecurityKeyIdentifierClause keyIdentifierClause, out SecurityToken token)
{
if (keyIdentifierClause == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("keyIdentifierClause");
token = null;
SecurityToken securityToken = ResolveSecurityToken(keyIdentifierClause);
if (securityToken != null)
token = securityToken;
return (token != null);
}
SecurityToken ResolveSecurityToken(SecurityKeyIdentifierClause keyIdentifierClause)
{
if (keyIdentifierClause == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("keyIdentifierClause");
if (!this.canMatchLocalId && keyIdentifierClause is LocalIdKeyIdentifierClause)
return null;
for (int i = 0; i < this.tokens.Count; ++i)
{
if (this.tokens[i].MatchesKeyIdentifierClause(keyIdentifierClause))
return this.tokens[i];
}
return null;
}
}
}
}
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