Code:
/ WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / infocard / Service / managed / Microsoft / InfoCards / InfoCardMetadataExchangeClient.cs / 2 / InfoCardMetadataExchangeClient.cs
//------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------- namespace Microsoft.InfoCards { using System; using System.ServiceModel; using System.ServiceModel.Channels; using System.ServiceModel.Description; using System.Net; using IDT = Microsoft.InfoCards.Diagnostics.InfoCardTrace; using System.IO; using System.Text; internal class InfoCardMetadataExchangeClient :MetadataExchangeClient { HttpWebRequest m_currentHttpGetRequest; object m_abortSync; bool m_aborted; IWebProxy m_proxy; // // Summary: // Creates a HttpsTransportBindingelement for mex interactions // // Remarks: // We are manually creating a CustomBinding as opposed to relying on // new WSHttpBinding( SecurityMode.Transport ) ); which sets AuthenticationScheme // to Negotiate by default. Another difference is that new WSHttpBinding inserts // a irrelevant TransactionFlowBindingElement. This is "irrelevant" because // TransactionFlowBindingElement doesn't yield a channel when Transactions = false. // See CSDMain 7086 for details. // // Remarks: We're setting httpTransportBinding.AuthenticationScheme to Anonymous // for all legs including IP/STS leg // public static CustomBinding CreateBindingForMex() { HttpsTransportBindingElement httpsTransport = new HttpsTransportBindingElement(); IDT.Assert( AuthenticationSchemes.Anonymous == httpsTransport.AuthenticationScheme, "AuthenticationScheme must be Anonymous and not NTLM/Negotiate" ); CustomBinding httpsBinding = new CustomBinding( new TextMessageEncodingBindingElement(), //the same encoding used when WsHttpBinding is used httpsTransport ); return httpsBinding; } public InfoCardMetadataExchangeClient() : base( CreateBindingForMex() ) { // // We enforce CardSpace restrictions on the WSHttpBinding binding // in the GetChannelFactory override // m_abortSync = new object(); } public IWebProxy Proxy { set { m_proxy = value; } } public void Abort() { lock( m_abortSync ) { if( null != m_currentHttpGetRequest ) { m_currentHttpGetRequest.Abort(); } else { ChannelFactoryfactory = base.GetChannelFactory(null,null,null); if( null != factory ) { factory.Abort(); } } m_aborted = true; } } protected internal override HttpWebRequest GetWebRequest( System.Uri location, string dialect, string identifier ) { if( 0 != String.Compare( location.Scheme, "https", StringComparison.OrdinalIgnoreCase ) ) { throw IDT.ThrowHelperError( new TrustExchangeException( SR.GetString( SR.NonHttpsURIFound, location.AbsoluteUri ) ) ); } HttpWebRequest request = base.GetWebRequest( location, dialect, identifier ); IDT.Assert( null == request.Credentials, "No creds should be set" ); IDT.Assert( null != m_proxy, "Set the proxy value before creating a WebRequest" ); request.Proxy = m_proxy; lock( m_abortSync ) { // // if we are already in an aborted state, ensure that the next request automatically aborts. // if( m_aborted ) { request.Abort(); } return (m_currentHttpGetRequest = request); } } protected internal override ChannelFactory GetChannelFactory( EndpointAddress metadataAddress, string dialect, string identifier ) { if( null != metadataAddress && 0 != String.Compare( metadataAddress.Uri.Scheme, "https", StringComparison.OrdinalIgnoreCase ) ) { throw IDT.ThrowHelperError( new TrustExchangeException( SR.GetString( SR.NonHttpsURIFound, metadataAddress.Uri.AbsoluteUri ) ) ); } IDT.Assert( null != m_proxy, "Set the proxy value before creating a WebRequest" ); ChannelFactory factory = base.GetChannelFactory( metadataAddress, dialect, identifier ); // // Can't set factory.Credentials.Windows.AllowNtlm = false; // Exception thrown that the factory.Credentials.Windows // "Object is immutable". // // WCF makes it read-only after the first leg in federation chain. // This is probably to ensure that settings on the channelFactory do not // change when multiple channels are created from the same channelFactory. // This happens specifically in ChannelFactory.Open() (which can be triggered by opening a // channel created by the factory) // factory.Endpoint.Binding = new CustomBinding( Utility.UpdateProxyForHttpAndRestrictTransportBinding( factory.Endpoint.Binding.CreateBindingElements(), m_proxy, true ) ); // Client auth on transport should be turned off for mex. lock( m_abortSync ) { // // if we are already in an aborted state, ensure that the next request automatically aborts. // if( m_aborted ) { factory.Abort(); } } return factory; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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