context: //
  // WebHttpBehavior.cs
  //
  // Author:
  //	Atsushi Enomoto  <atsushi@ximian.com>
  //
  // Copyright (C) 2008 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.Net;
  using System.ServiceModel;
  using System.ServiceModel.Channels;
  using System.ServiceModel.Dispatcher;
  using System.ServiceModel.Web;
  
  namespace System.ServiceModel.Description
  {
  
  	internal static class WebHttpBehaviorExtensions
  	{
  		public static WebAttributeInfo GetWebAttributeInfo (this OperationDescription od)
  		{
  			foreach (IOperationBehavior ob in od.Behaviors) {
  				WebAttributeInfo info = null;
  				var wg = ob as WebGetAttribute;
  				if (wg != null)
  					return wg.Info;
  				var wi = ob as WebInvokeAttribute;
  				if (wi != null)
  					return wi.Info;
  			}
  			return new WebGetAttribute ().Info; // blank one
  		}
  	}
  
  	public class WebHttpBehavior : IEndpointBehavior
  	{
  		public WebHttpBehavior ()
  		{
  			DefaultBodyStyle = WebMessageBodyStyle.Bare;
  			DefaultOutgoingRequestFormat = WebMessageFormat.Xml;
  			DefaultOutgoingResponseFormat = WebMessageFormat.Xml;
  		}
  
  #if NET_4_0
  		public virtual bool AutomaticFormatSelectionEnabled { get; set; }
  
  		public virtual bool FaultExceptionEnabled { get; set; }
  
  		public virtual bool HelpEnabled { get; set; }
  #endif
  
  		public virtual WebMessageBodyStyle DefaultBodyStyle { get; set; }
  
  		public virtual WebMessageFormat DefaultOutgoingRequestFormat { get; set; }
  
  		public virtual WebMessageFormat DefaultOutgoingResponseFormat { get; set; }
  
  		public virtual void AddBindingParameters (ServiceEndpoint endpoint, BindingParameterCollection bindingParameters)
  		{
  			// nothing
  		}
  
  		[MonoTODO]
  		protected virtual void AddClientErrorInspector (ServiceEndpoint endpoint, ClientRuntime clientRuntime)
  		{
  			// clientRuntime.MessageInspectors.Add (something);
  		}
  
  #if !NET_2_1
  		protected virtual void AddServerErrorHandlers (ServiceEndpoint endpoint, EndpointDispatcher endpointDispatcher)
  		{
  			endpointDispatcher.ChannelDispatcher.ErrorHandlers.Add (new WebHttpErrorHandler ());
  		}
  #endif
  
  		public virtual void ApplyClientBehavior (ServiceEndpoint endpoint, ClientRuntime clientRuntime)
  		{
  			AddClientErrorInspector (endpoint, clientRuntime);
  			foreach (ClientOperation oper in clientRuntime.Operations) {
  				var req = GetRequestClientFormatter (endpoint.Contract.Operations.Find (oper.Name), endpoint);
  				var res = GetReplyClientFormatter (endpoint.Contract.Operations.Find (oper.Name), endpoint);
  				oper.Formatter = new ClientPairFormatter (req, res);
  			}
  		}
  
  		public virtual void ApplyDispatchBehavior (ServiceEndpoint endpoint, EndpointDispatcher endpointDispatcher)
  		{
  #if NET_2_1
  			throw new NotImplementedException ();
  #else
  			endpointDispatcher.DispatchRuntime.OperationSelector = GetOperationSelector (endpoint);
  			// FIXME: get HostNameComparisonMode from WebHttpBinding by some means.
  			endpointDispatcher.FilterPriority = 1; // It is to take higher priority than that of ServiceMetadataExtension (whose URL likely conflicts with this one).
  			endpointDispatcher.AddressFilter = new PrefixEndpointAddressMessageFilter (endpoint.Address);
  			endpointDispatcher.ContractFilter = new MatchAllMessageFilter ();
  			AddServerErrorHandlers (endpoint, endpointDispatcher);
  
  			foreach (DispatchOperation oper in endpointDispatcher.DispatchRuntime.Operations) {
  				var req = GetRequestDispatchFormatter (endpoint.Contract.Operations.Find (oper.Name), endpoint);
  				var res = GetReplyDispatchFormatter (endpoint.Contract.Operations.Find (oper.Name), endpoint);
  				oper.Formatter = new DispatchPairFormatter (req, res);
  			}
  			endpointDispatcher.DispatchRuntime.UnhandledDispatchOperation = new DispatchOperation (endpointDispatcher.DispatchRuntime, "*", "*", "*") {
  				Invoker = new EndpointNotFoundOperationInvoker (),
  				DeserializeRequest = false,
  				SerializeReply = false};
  #endif
  		}
  
  		internal class ClientPairFormatter : IClientMessageFormatter
  		{
  			public ClientPairFormatter (IClientMessageFormatter request, IClientMessageFormatter reply)
  			{
  				this.request = request;
  				this.reply = reply;
  			}
  
  			IClientMessageFormatter request, reply;
  
  			public Message SerializeRequest (MessageVersion messageVersion, object [] parameters)
  			{
  				return request.SerializeRequest (messageVersion, parameters);
  			}
  
  			public object DeserializeReply (Message message, object [] parameters)
  			{
  				return reply.DeserializeReply (message, parameters);
  			}
  		}
  
  #if !NET_2_1
  		internal class DispatchPairFormatter : IDispatchMessageFormatter
  		{
  			public DispatchPairFormatter (IDispatchMessageFormatter request, IDispatchMessageFormatter reply)
  			{
  				this.request = request;
  				this.reply = reply;
  			}
  
  			IDispatchMessageFormatter request;
  			IDispatchMessageFormatter reply;
  
  			public void DeserializeRequest (Message message, object [] parameters)
  			{
  				request.DeserializeRequest (message, parameters);
  			}
  
  			public Message SerializeReply (MessageVersion messageVersion, object [] parameters, object result)
  			{
  				return reply.SerializeReply (messageVersion, parameters, result);
  			}
  		}
  
  		protected virtual WebHttpDispatchOperationSelector GetOperationSelector (ServiceEndpoint endpoint)
  		{
  			return new WebHttpDispatchOperationSelector (endpoint);
  		}
  #endif
  
  		protected virtual QueryStringConverter GetQueryStringConverter (OperationDescription operationDescription)
  		{
  			return new QueryStringConverter ();
  		}
  
  		protected virtual IClientMessageFormatter GetReplyClientFormatter (OperationDescription operationDescription, ServiceEndpoint endpoint)
  		{
  			return new WebMessageFormatter.ReplyClientFormatter (operationDescription, endpoint, GetQueryStringConverter (operationDescription), this);
  		}
  
  #if !NET_2_1
  		protected virtual IDispatchMessageFormatter GetReplyDispatchFormatter (OperationDescription operationDescription, ServiceEndpoint endpoint)
  		{
  			return new WebMessageFormatter.ReplyDispatchFormatter (operationDescription, endpoint, GetQueryStringConverter (operationDescription), this);
  		}
  #endif
  
  		protected virtual IClientMessageFormatter GetRequestClientFormatter (OperationDescription operationDescription, ServiceEndpoint endpoint)
  		{
  			return new WebMessageFormatter.RequestClientFormatter (operationDescription, endpoint, GetQueryStringConverter (operationDescription), this);
  		}
  
  #if !NET_2_1
  		protected virtual IDispatchMessageFormatter GetRequestDispatchFormatter (OperationDescription operationDescription, ServiceEndpoint endpoint)
  		{
  			return new WebMessageFormatter.RequestDispatchFormatter (operationDescription, endpoint, GetQueryStringConverter (operationDescription), this);
  		}
  #endif
  
  		WebMessageBodyStyle GetBodyStyle (WebAttributeInfo wai)
  		{
  			return wai != null && wai.IsBodyStyleSetExplicitly ? wai.BodyStyle : DefaultBodyStyle;
  		}
  
  		protected void ValidateOperation (OperationDescription operation)
  		{
  			var wai = operation.GetWebAttributeInfo ();
  			if (wai.Method == "GET")
  				return;
  			var style = GetBodyStyle (wai);
  
  			// if the style is wrapped there won't be problems
  			if (style == WebMessageBodyStyle.Wrapped)
  				return;
  
  			string [] parameters;
  
gt: 			if (wai.UriTemplate != null) {