context: //
  // HttpTransportBindingElement.cs
  //
  // Author:
  //	Atsushi Enomoto <atsushi@ximian.com>
  //
  // Copyright (C) 2005-2010 Novell, Inc.  http://www.novell.com
  //
  // Permission is hereby granted, free of charge, to any person obtaining
  // a copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to
  // permit persons to whom the Software is furnished to do so, subject to
  // the following conditions:
  // 
  // The above copyright notice and this permission notice shall be
  // included in all copies or substantial portions of the Software.
  // 
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  //
  using System;
  using System.Collections.Generic;
  using System.ComponentModel;
  using System.Net;
  using System.Net.Security;
  using System.Security.Authentication.ExtendedProtection;
  using System.ServiceModel.Channels;
  #if !NET_2_1
  using System.ServiceModel.Channels.Http;
  #endif
  using System.ServiceModel.Description;
  #if !MOBILE
  using WS = System.Web.Services.Description;
  #endif
  using System.Xml;
  
  namespace System.ServiceModel.Channels
  {
  	public class HttpTransportBindingElement : TransportBindingElement,
  		IPolicyExportExtension, IWsdlExportExtension
  	{
  		bool allow_cookies, bypass_proxy_on_local,
  			unsafe_ntlm_auth;
  		bool use_default_proxy = true, keep_alive_enabled = true;
  		int max_buffer_size = 0x10000;
  		HostNameComparisonMode host_cmp_mode;
  		Uri proxy_address;
  		string realm = String.Empty;
  		TransferMode transfer_mode;
  		IDefaultCommunicationTimeouts timeouts;
  		AuthenticationSchemes auth_scheme =
  			AuthenticationSchemes.Anonymous;
  		AuthenticationSchemes proxy_auth_scheme =
  			AuthenticationSchemes.Anonymous;
  		// If you add fields, do not forget them in copy constructor.
  		HttpCookieContainerManager cookie_manager;
  
  		public HttpTransportBindingElement ()
  		{
  		}
  
  		protected HttpTransportBindingElement (
  			HttpTransportBindingElement other)
  			: base (other)
  		{
  			allow_cookies = other.allow_cookies;
  			bypass_proxy_on_local = other.bypass_proxy_on_local;
  			unsafe_ntlm_auth = other.unsafe_ntlm_auth;
  			use_default_proxy = other.use_default_proxy;
  			keep_alive_enabled = other.keep_alive_enabled;
  			max_buffer_size = other.max_buffer_size;
  			host_cmp_mode = other.host_cmp_mode;
  			proxy_address = other.proxy_address;
  			realm = other.realm;
  			transfer_mode = other.transfer_mode;
  			// FIXME: it does not look safe
  			timeouts = other.timeouts;
  			auth_scheme = other.auth_scheme;
  			proxy_auth_scheme = other.proxy_auth_scheme;
  
  			DecompressionEnabled = other.DecompressionEnabled;
  			LegacyExtendedProtectionPolicy = other.LegacyExtendedProtectionPolicy;
  			ExtendedProtectionPolicy = other.ExtendedProtectionPolicy;
  			cookie_manager = other.cookie_manager;
  		}
  
  		[DefaultValue (AuthenticationSchemes.Anonymous)]
  		public AuthenticationSchemes AuthenticationScheme {
  			get { return auth_scheme; }
  			set { auth_scheme = value; }
  		}
  
  		[DefaultValue (AuthenticationSchemes.Anonymous)]
  		public AuthenticationSchemes ProxyAuthenticationScheme {
  			get { return proxy_auth_scheme; }
  			set { proxy_auth_scheme = value; }
  		}
  
  		[DefaultValue (false)]
  		public bool AllowCookies {
  			get { return allow_cookies; }
  			set { allow_cookies = value; }
  		}
  
  		[DefaultValue (false)]
  		public bool BypassProxyOnLocal {
  			get { return bypass_proxy_on_local; }
  			set { bypass_proxy_on_local = value; }
  		}
  
  		[DefaultValue (false)]
  		[MonoTODO]
  		public bool DecompressionEnabled { get; set; }
  
  		[DefaultValue (HostNameComparisonMode.StrongWildcard)]
  		public HostNameComparisonMode HostNameComparisonMode {
  			get { return host_cmp_mode; }
  			set { host_cmp_mode = value; }
  		}
  
  		[DefaultValue (true)]
  		public bool KeepAliveEnabled {
  			get { return keep_alive_enabled; }
  			set { keep_alive_enabled = value; }
  		}
  
  		[DefaultValue (0x10000)]
  		public int MaxBufferSize {
  			get { return max_buffer_size; }
  			set { max_buffer_size = value; }
  		}
  
  		[DefaultValue (null)]
  		[TypeConverter (typeof (UriTypeConverter))]
  		public Uri ProxyAddress {
  			get { return proxy_address; }
  			set { proxy_address = value; }
  		}
  
  		[DefaultValue ("")]
  		public string Realm {
  			get { return realm; }
  			set { realm = value; }
  		}
  
  		public override string Scheme {
  			get { return Uri.UriSchemeHttp; }
  		}
  
  		[DefaultValue (TransferMode.Buffered)]
  		public TransferMode TransferMode {
  			get { return transfer_mode; }
  			set { transfer_mode = value; }
  		}
  
  		[DefaultValue (false)]
  		public bool UnsafeConnectionNtlmAuthentication {
  			get { return unsafe_ntlm_auth; }
  			set { unsafe_ntlm_auth = value; }
  		}
  
  		[DefaultValue (true)]
  		public bool UseDefaultWebProxy {
  			get { return use_default_proxy; }
  			set { use_default_proxy = value; }
  		}
  
  		[Obsolete ("Use ExtendedProtectionPolicy")]
  		[MonoTODO]
  		public object LegacyExtendedProtectionPolicy { get; set; }
  
  		[MonoTODO]
  		public ExtendedProtectionPolicy ExtendedProtectionPolicy { get; set; }
  
  		public override bool CanBuildChannelFactory<TChannel> (
  			BindingContext context)
  		{
  			return typeof (TChannel) == typeof (IRequestChannel);
  		}
  
  #if !NET_2_1 && !XAMMAC_4_5
  		public override bool CanBuildChannelListener<TChannel> (
  			BindingContext context)
  		{
  			return typeof (TChannel) == typeof (IReplyChannel);
  		}
  #endif
  
  		public override IChannelFactory<TChannel> BuildChannelFactory<TChannel> (
  			BindingContext context)
  		{
  			// remaining contexts are ignored ... e.g. such binding
  			// element that always causes an error is ignored.
  			return new HttpChannelFactory<TChannel> (this, context);
  		}
  
  #if !NET_2_1 && !XAMMAC_4_5
  		internal static object ListenerBuildLock = new object ();
  
  		public override IChannelListener<TChannel> BuildChannelListener<TChannel> (
  			BindingContext context)
  		{
  			// remaining contexts are ignored ... e.g. such binding
  			// element that always causes an error is ignored.
  			return new HttpChannelListener<TChannel> (this, context);
  		}
  #endif
  
  		public override BindingElement Clone ()
  		{
  			return new HttpTransportBindingElement (this);
  		}
  
  		public override T GetProperty<T> (BindingContext context)
  		{
  			// http://blogs.msdn.com/drnick/archive/2007/04/10/interfaces-for-getproperty-part-1.aspx
  			if (typeof (T) == typeof (ISecurityCapabilities))
  				return (T) (object) new HttpBindingProperties (this);
  			if (typeof (T) == typeof (IBindingDeliveryCapabilities))
  				return (T) (object) new HttpBindingProperties (this);
  			if (typeof (T) == typeof (TransferMode))
  				return (T) (object) TransferMode;
  			if (typeof(T) == typeof(IHttpCookieContainerManager)) {
  				if (!AllowCookies)
  					return null;
  				if (cookie_manager == null)
  					cookie_manager = new HttpCookieContainerManager ();
  				return (T) (object) cookie_manager;
  			}
  			return base.GetProperty<T> (context);
  		}
  		
  		public WebSocketTransportSettings WebSocketSettings {
  			get { throw new NotImplementedException (); }
  			set { throw new NotImplementedException (); }
  		}
  
  #if !NET_2_1 && !XAMMAC_4_5
  		void IPolicyExportExtension.ExportPolicy (
  			MetadataExporter exporter,
  			PolicyConversionContext context)
  		{
  			if (exporter == null)
  				throw new ArgumentNullException ("exporter");
  			if (context == null)
  				throw new ArgumentNullException ("context");
  
  			PolicyAssertionCollection assertions = context.GetBindingAssertions ();
  			XmlDocument doc = new XmlDocument ();
  
  			ExportAddressingPolicy (context);
  
  			switch (auth_scheme) {
  			case AuthenticationSchemes.Basic:
  			case AuthenticationSchemes.Digest:
  			case AuthenticationSchemes.Negotiate:
  			case AuthenticationSchemes.Ntlm:
  				assertions.Add (doc.CreateElement ("http", 
  
gt: 						auth_scheme.ToString () + "Authentication", 