ScriptModule.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Extensions / Handlers / ScriptModule.cs / 1438166 / ScriptModule.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.Handlers { 
    using System; 
    using System.Collections.Generic;
    using System.Globalization; 
    using System.Linq;
    using System.Net;
    using System.Threading;
    using System.Web; 
    using System.Web.ApplicationServices;
    using System.Web.UI; 
    using System.Web.Resources; 
    using System.Web.Script.Services;
    using System.Web.Security; 

    public class ScriptModule : IHttpModule {
        private static readonly object _contextKey = new Object();
 
        private static Type _authenticationServiceType = typeof(System.Web.Security.AuthenticationService); // disambiguation required
        private static int _isHandlerRegistered; 
 
        private static bool ShouldSkipAuthorization(HttpContext context) {
            if (context == null || context.Request == null) { 
                return false;
            }

            string path = context.Request.FilePath; 
            if (ScriptResourceHandler.IsScriptResourceRequest(path)) {
                return true; 
            } 

            // if auth service is disabled, dont bother checking. 
            // (NOTE: if a custom webservice is used, it will be up to them to enable anon access to it)
            // if it isn't a rest request dont bother checking.
            if(!ApplicationServiceHelper.AuthenticationServiceEnabled || !RestHandlerFactory.IsRestRequest(context)) {
                return false; 
            }
 
            if(context.SkipAuthorization) { 
                return true;
            } 

            // it may be a rest request to a webservice. It must end in axd if it is an app service.
            if((path == null) || !path.EndsWith(".axd", StringComparison.OrdinalIgnoreCase)) {
                return false; 
            }
 
            // WebServiceData caches the object in cache, so this should be a quick lookup. 
            // If it hasnt been cached yet, this will cause it to be cached, so later in the request
            // it will be a cache-hit anyway. 
            WebServiceData wsd = WebServiceData.GetWebServiceData(context, path, false, false);
            if((wsd != null) && (_authenticationServiceType == wsd.TypeData.Type)) {
                return true;
            } 

            return false; 
        } 

        protected virtual void Dispose() { 
        }

        private void AuthenticateRequestHandler(object sender, EventArgs e) {
            // flags the request with SkipAuthorization if it is a request for 
            // the script Authentication webservice.
            HttpApplication app = (HttpApplication)sender; 
            if (app != null && ShouldSkipAuthorization(app.Context)) { 
                app.Context.SetSkipAuthorizationNoDemand(true, false);
            } 
        }

        private void EndRequestHandler(object sender, EventArgs e){
            // DevDiv 100198: Send error response from EndRequest so Page and Application error handlers still fire on async posts 
            // DevDiv 118737: Call Response.Clear as well as Response.ClearHeaders to force status code reset in integrated mode and
            // to ensure there are no errant headers such as a caching policy. Do not call Response.End or app.CompleteRequest as they 
            // are pointless from the EndRequest event. 
            HttpApplication app = (HttpApplication)sender;
            HttpContext context = app.Context; 
            object o = context.Items[PageRequestManager.AsyncPostBackErrorKey];

            if ((o != null) && ((bool)o == true)) {
                context.ClearError(); 
                context.Response.ClearHeaders();
                context.Response.Clear(); 
                context.Response.Cache.SetCacheability(HttpCacheability.NoCache); 
                context.Response.ContentType = "text/plain";
 
                string errorMessage = (string)context.Items[PageRequestManager.AsyncPostBackErrorMessageKey];
                o = context.Items[PageRequestManager.AsyncPostBackErrorHttpCodeKey];
                // o should definitely be an int, but user code could overwrite it
                int httpCode = (o is int) ? (int)o : 500; 

                PageRequestManager.EncodeString(context.Response.Output, 
                    PageRequestManager.ErrorToken, 
                    httpCode.ToString(CultureInfo.InvariantCulture),
                    errorMessage); 
            }
        }

        protected virtual void Init(HttpApplication app) { 

            ////////////////////////////////////////////////////////////////// 
            // Check if this module has been already addded 
            if (app.Context.Items[_contextKey] != null) {
                return; // already added to the pipeline 
            }
            app.Context.Items[_contextKey] = _contextKey;

            // use the static HttpResponse.Redirecting event to hook all Response.Redirects. 
            // Only hook the event once. Multiple pipelines may cause multiple instances of this
            // module to be created. 
            if (Interlocked.Exchange(ref _isHandlerRegistered, 1) == 0) { 
                HttpResponse.Redirecting += new EventHandler(HttpResponse_Redirecting);
            } 
            app.PostAcquireRequestState += new EventHandler(OnPostAcquireRequestState);
            app.AuthenticateRequest += new EventHandler(AuthenticateRequestHandler);
            // DevDiv 100198: Send error response from EndRequest so Page and Application error handlers still fire on async posts
            app.EndRequest += new EventHandler(EndRequestHandler); 
        }
 
        private static void HttpResponse_Redirecting(object sender, EventArgs e) { 
            HttpResponse response = (HttpResponse)sender;
            HttpContext context = response.Context; 
            // Is in async postback, get status code and check for 302
            if (PageRequestManager.IsAsyncPostBackRequest(new HttpRequestWrapper(context.Request))) {
                // Save the redirect location and other data before we clear it
                string redirectLocation = response.RedirectLocation; 
                List cookies = new List(response.Cookies.Count);
                for (int i = 0; i < response.Cookies.Count; i++) { 
                    cookies.Add(response.Cookies[i]); 
                }
 
                // Clear the entire response and send a custom response that the client script can process
                response.ClearContent();
                response.ClearHeaders();
                for (int i = 0; i < cookies.Count; i++) { 
                    response.AppendCookie(cookies[i]);
                } 
                response.Cache.SetCacheability(HttpCacheability.NoCache); 
                response.ContentType = "text/plain";
                PageRequestManager.EncodeString(response.Output, PageRequestManager.UpdatePanelVersionToken, String.Empty, PageRequestManager.UpdatePanelVersionNumber); 
                // url encode the location in a way that javascript unescape() will be able to reverse
                redirectLocation = String.Join(" ", redirectLocation.Split(' ').Select(part => HttpUtility.UrlEncode(part)));
                PageRequestManager.EncodeString(response.Output, PageRequestManager.PageRedirectToken, String.Empty, redirectLocation);
            } 
            else if (RestHandlerFactory.IsRestRequest(context)) {
                // We need to special case webservice redirects, as we want them to fail (always are auth failures) 
                RestHandler.WriteExceptionJsonString(context, new InvalidOperationException(AtlasWeb.WebService_RedirectError), (int)HttpStatusCode.Unauthorized); 
            }
        } 

        private void OnPostAcquireRequestState(object sender, EventArgs eventArgs) {
            HttpApplication app = (HttpApplication)sender;
            HttpRequest request = app.Context.Request; 

            if (app.Context.Handler is Page && RestHandlerFactory.IsRestMethodCall(request)) { 
                // Get the data about the web service being invoked 
                WebServiceData webServiceData = WebServiceData.GetWebServiceData(HttpContext.Current, request.FilePath, false, true);
 
                // Get the method name
                string methodName = request.PathInfo.Substring(1);

                // Get the data about the specific method being called 
                WebServiceMethodData methodData = webServiceData.GetMethodData(methodName);
                RestHandler.ExecuteWebServiceCall(HttpContext.Current, methodData); 
 
                // Skip the rest of the page lifecycle
                app.CompleteRequest(); 
            }
        }

        #region IHttpModule Members 
        void IHttpModule.Dispose() {
            Dispose(); 
        } 

        void IHttpModule.Init(HttpApplication context) { 
            Init(context);
        }
        #endregion
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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