WebScriptClientGenerator.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx35 / System.ServiceModel.Web / System / ServiceModel / Description / WebScriptClientGenerator.cs / 1305376 / WebScriptClientGenerator.cs
                        
                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

namespace System.ServiceModel.Description 
{
    using System; 
    using System.Globalization; 
    using System.Net;
    using System.Runtime.Serialization.Json; 
    using System.ServiceModel.Activation;
    using System.ServiceModel.Channels;
    using System.ServiceModel.Dispatcher;
    using System.Web; 
    using System.Web.Script.Services;
 
    class WebScriptClientGenerator : ServiceMetadataExtension.IHttpGetMetadata 
    {
        internal const string DebugMetadataEndpointSuffix = "jsdebug"; 
        internal const string MetadataEndpointSuffix = "js";
        bool debugMode;
        ServiceEndpoint endpoint;
        NameValueCache proxyCache; 
        DateTime serviceLastModified;
        string serviceLastModifiedRfc1123String; 
        bool crossDomainScriptAccessEnabled; 

        public WebScriptClientGenerator(ServiceEndpoint endpoint, bool debugMode, bool crossDomainScriptAccessEnabled) 
        {
            this.endpoint = endpoint;
            this.debugMode = debugMode;
            // The service host is automatically restarted every time a service or any of its dependencies change 
            // A restart adds all the behaviors from scratch.
            // => WebScriptEnablingBehavior plugs in this contract for the "/js" endpoint afresh if the service changes. 
            this.serviceLastModified = DateTime.UtcNow; 
            // Zero out all millisecond and sub-millisecond information because RFC1123 doesn't support milliseconds.
            // => The parsed If-Modified-Since date, against which serviceLastModified will need to be compared, 
            //    won't have milliseconds.
            this.serviceLastModified = new DateTime(this.serviceLastModified.Year, this.serviceLastModified.Month, this.serviceLastModified.Day, this.serviceLastModified.Hour, this.serviceLastModified.Minute, this.serviceLastModified.Second, DateTimeKind.Utc);
            this.proxyCache = new NameValueCache();
            this.crossDomainScriptAccessEnabled = crossDomainScriptAccessEnabled; 
        }
 
        string GetProxyContent(Uri baseUri) 
        {
            string proxy = this.proxyCache.Lookup(baseUri.Authority); 
            if (String.IsNullOrEmpty(proxy))
            {
                proxy = ProxyGenerator.GetClientProxyScript(this.endpoint.Contract.ContractType, baseUri.AbsoluteUri, this.debugMode, endpoint);
                this.proxyCache.AddOrUpdate(baseUri.Authority, proxy); 
            }
            return proxy; 
        } 

        string ServiceLastModifiedRfc1123String 
        {
            get
            {
                if (serviceLastModifiedRfc1123String == null) 
                {
                    // "R" for RFC1123. The HTTP standard requires that dates be serialized according to RFC1123. 
                    serviceLastModifiedRfc1123String = serviceLastModified.ToString("R", DateTimeFormatInfo.InvariantInfo); 
                }
                return serviceLastModifiedRfc1123String; 
            }
        }

        public Message Get(Message message) 
        {
            HttpRequestMessageProperty requestMessageProperty = (HttpRequestMessageProperty) message.Properties[HttpRequestMessageProperty.Name]; 
            HttpResponseMessageProperty responseMessageProperty = new HttpResponseMessageProperty(); 

            if ((requestMessageProperty != null) && IsServiceUnchanged(requestMessageProperty.Headers[JsonGlobals.IfModifiedSinceString])) 
            {
                Message responseMessage = Message.CreateMessage(MessageVersion.None, string.Empty);
                responseMessageProperty.StatusCode = HttpStatusCode.NotModified;
                responseMessage.Properties.Add(HttpResponseMessageProperty.Name, responseMessageProperty); 
                return responseMessage;
            } 
 
            string proxyContent = this.GetProxyContent(UriTemplate.RewriteUri(this.endpoint.Address.Uri, requestMessageProperty.Headers[HttpRequestHeader.Host]));
            Message response = new WebScriptMetadataMessage(string.Empty, proxyContent); 
            responseMessageProperty.Headers.Add(JsonGlobals.LastModifiedString, ServiceLastModifiedRfc1123String);
            responseMessageProperty.Headers.Add(JsonGlobals.ExpiresString, ServiceLastModifiedRfc1123String);
            if (AspNetEnvironment.Current.AspNetCompatibilityEnabled)
            { 
                HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.Public);
            } 
            else 
            {
                responseMessageProperty.Headers.Add(JsonGlobals.CacheControlString, JsonGlobals.publicString); 
            }
            response.Properties.Add(HttpResponseMessageProperty.Name, responseMessageProperty);
            return response;
        } 

        internal static string GetMetadataEndpointSuffix(bool debugMode) 
        { 
            if (debugMode)
            { 
                return DebugMetadataEndpointSuffix;
            }
            else
            { 
                return MetadataEndpointSuffix;
            } 
        } 

        bool IsServiceUnchanged(string ifModifiedSinceHeaderValue) 
        {
            if (string.IsNullOrEmpty(ifModifiedSinceHeaderValue))
            {
                return false; 
            }
 
            DateTime ifModifiedSinceDateTime; 
            if (DateTime.TryParse(ifModifiedSinceHeaderValue, DateTimeFormatInfo.InvariantInfo, DateTimeStyles.AdjustToUniversal, out ifModifiedSinceDateTime))
            { 
                return (ifModifiedSinceDateTime >= serviceLastModified);
            }

            return false; 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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WebScriptClientGenerator.cs source code in C# .NET

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