Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / DefaultHttpHandler.cs / 1 / DefaultHttpHandler.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web { using System; using System.Collections; using System.Collections.Specialized; using System.Globalization; using System.Text; using System.Web.Util; using System.Security.Permissions; [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] public class DefaultHttpHandler : IHttpAsyncHandler { private HttpContext _context; private NameValueCollection _executeUrlHeaders; public DefaultHttpHandler() { } protected HttpContext Context { get { return _context; } } // headers to provide to execute url protected NameValueCollection ExecuteUrlHeaders { get { if (_executeUrlHeaders == null && _context != null) { _executeUrlHeaders = new NameValueCollection(_context.Request.Headers); } return _executeUrlHeaders; } } // called when we know a precondition for calling // execute URL has been violated public virtual void OnExecuteUrlPreconditionFailure() { // do nothing - the derived class might throw } // add a virtual method that provides the request target for the EXECUTE_URL call // if return null, the default calls EXECUTE_URL for the default target public virtual String OverrideExecuteUrlPath() { return null; } internal static bool IsClassicAspRequest(String filePath) { return StringUtil.StringEndsWithIgnoreCase(filePath, ".asp"); } public virtual IAsyncResult BeginProcessRequest(HttpContext context, AsyncCallback callback, Object state) { _context = context; HttpResponse response = _context.Response; if (response.CanExecuteUrlForEntireResponse) { // use ExecuteUrl String path = OverrideExecuteUrlPath(); if (path != null && !HttpRuntime.IsFullTrust) { // validate that an untrusted derived classes (not in GAC) // didn't set the path to a place that CAS wouldn't let it access if (!this.GetType().Assembly.GlobalAssemblyCache) { HttpRuntime.CheckFilePermission(context.Request.MapPath(path)); } } return response.BeginExecuteUrlForEntireResponse(path, _executeUrlHeaders, callback, state); } else { // let the base class throw if it doesn't want static files handler OnExecuteUrlPreconditionFailure(); // use static file handler _context = null; // don't keep request data alive in sync case HttpRequest request = context.Request; // refuse POST requests if (request.HttpVerb == HttpVerb.POST) { throw new HttpException(405, SR.GetString(SR.Method_not_allowed, request.HttpMethod, request.Path)); } // refuse .asp requests if (IsClassicAspRequest(request.FilePath)) { throw new HttpException(403, SR.GetString(SR.Path_forbidden, request.Path)); } // default to static file handler StaticFileHandler.ProcessRequestInternal(context); // return async result indicating completion return new HttpAsyncResult(callback, state, true, null, null); } } public virtual void EndProcessRequest(IAsyncResult result) { if (_context != null) { HttpResponse response = _context.Response; _context = null; response.EndExecuteUrlForEntireResponse(result); } } public virtual void ProcessRequest(HttpContext context) { // this handler should never be called synchronously throw new InvalidOperationException(SR.GetString(SR.Cannot_call_defaulthttphandler_sync)); } public virtual bool IsReusable { get { return false; } } } }
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