ScriptModule.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / Orcas / RTM / ndp / fx / src / xsp / System / Web / Extensions / Handlers / ScriptModule.cs / 1 / ScriptModule.cs
                        

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

namespace System.Web.Handlers { 
    using System; 
    using System.Collections.Generic;
    using System.Globalization; 
    using System.Net;
    using System.Security.Permissions;
    using System.Web;
    using System.Web.ApplicationServices; 
    using System.Web.UI;
    using System.Web.Resources; 
    using System.Web.Script.Services; 
    using System.Web.Security;
 
    [
    AspNetHostingPermission(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal),
    AspNetHostingPermission(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)
    ] 
    public class ScriptModule : IHttpModule {
        private static Type _authenticationServiceType = typeof(System.Web.Security.AuthenticationService); // disambiguation required 
 
        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.SkipAuthorization = true;
            } 
        }

        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(); 
 
                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 context) {
            context.PreSendRequestHeaders += new EventHandler(PreSendRequestHeadersHandler);
            context.PostAcquireRequestState += new EventHandler(OnPostAcquireRequestState); 
            context.AuthenticateRequest += new EventHandler(AuthenticateRequestHandler);
            // DevDiv 100198: Send error response from EndRequest so Page and Application error handlers still fire on async posts 
            context.EndRequest += new EventHandler(EndRequestHandler); 
        }
 
        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();
            } 
        }

        private void PreSendRequestHeadersHandler(object sender, EventArgs args) {
            HttpApplication application = (HttpApplication)sender; 
            HttpResponse response = application.Response;
 
            if (response.StatusCode == 302) { 
                // Is in async postback, get status code and check for 302
                if (PageRequestManager.IsAsyncPostBackRequest(application.Request.Headers)) { 

                    // 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.PageRedirectToken, String.Empty, redirectLocation);
                } 
                else if (RestHandlerFactory.IsRestRequest(application.Context)) {
                    // We need to special case webservice redirects, as we want them to fail (always are auth failures)
                    RestHandler.WriteExceptionJsonString(application.Context, new InvalidOperationException(AtlasWeb.WebService_RedirectError), (int)HttpStatusCode.Unauthorized);
                } 
            }
        } 
 
        #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.
// Copyright (c) Microsoft Corporation. All rights reserved.

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