PageRouteHandler.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / Routing / PageRouteHandler.cs / 1305376 / PageRouteHandler.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.Routing { 
 
    using System;
    using System.Web.UI; 
    using System.Web.Compilation;
    using System.Web.Security;
    using System.Security;
    using System.Security.Permissions; 
    using System.Security.Principal;
 
    public class PageRouteHandler : IRouteHandler { 
        public PageRouteHandler(string virtualPath)
            : this(virtualPath, true) { 
        }

        public PageRouteHandler(string virtualPath, bool checkPhysicalUrlAccess) {
            if (string.IsNullOrEmpty(virtualPath) || !virtualPath.StartsWith("~/", StringComparison.OrdinalIgnoreCase)) { 
                throw new ArgumentException(SR.GetString(SR.PageRouteHandler_InvalidVirtualPath), "virtualPath");
            } 
 
            this.VirtualPath = virtualPath;
            this.CheckPhysicalUrlAccess = checkPhysicalUrlAccess; 
            _useRouteVirtualPath = VirtualPath.Contains("{");
        }

        ///  
        /// This is the full virtual path (using tilde syntax) to the WebForm page.
        ///  
        ///  
        /// Needs to be thread safe so this is only settable via ctor.
        ///  
        public string VirtualPath { get; private set; }

        /// 
        /// Because we're not actually rewriting the URL, ASP.NET's URL Auth will apply 
        /// to the incoming request URL and not the URL of the physical WebForm page.
        /// Setting this to true (default) will apply URL access rules against the 
        /// physical file. 
        /// 
        /// True by default 
        public bool CheckPhysicalUrlAccess { get; private set; }

        private bool _useRouteVirtualPath;
        private Route _routeVirtualPath; 
        private Route RouteVirtualPath {
            get { 
                if (_routeVirtualPath == null) { 
                    //Trim off ~/
                    _routeVirtualPath = new Route(VirtualPath.Substring(2), this); 
                }
                return _routeVirtualPath;
            }
        } 

        private bool CheckUrlAccess(string virtualPath, RequestContext requestContext) { 
            IPrincipal user = requestContext.HttpContext.User; 
            // If there's no authenticated user, use the default identity
            if (user == null) { 
                user = new GenericPrincipal(new GenericIdentity(String.Empty, String.Empty), new string[0]);
            }
            return CheckUrlAccessWithAssert(virtualPath, requestContext, user);
        } 

        [SecurityPermission(SecurityAction.Assert, Unrestricted = true)] 
        private bool CheckUrlAccessWithAssert(string virtualPath, RequestContext requestContext, IPrincipal user) { 
            return UrlAuthorizationModule.CheckUrlAccessForPrincipal(virtualPath, user, requestContext.HttpContext.Request.HttpMethod);
        } 

        public virtual IHttpHandler GetHttpHandler(RequestContext requestContext) {
            if (requestContext == null) {
                throw new ArgumentNullException("requestContext"); 
            }
 
            string virtualPath = GetSubstitutedVirtualPath(requestContext); 
            // Virtual Path ----s up with query strings, so we need to strip them off
            int qmark = virtualPath.IndexOf('?'); 
            if (qmark != -1) {
                virtualPath = virtualPath.Substring(0, qmark);
            }
            if (this.CheckPhysicalUrlAccess && !CheckUrlAccess(virtualPath, requestContext)) { 
                return new UrlAuthFailureHandler();
            } 
 
            Page page = BuildManager.CreateInstanceFromVirtualPath(virtualPath, typeof(Page)) as Page;
            return page; 
        }

        /// 
        /// Gets the virtual path to the resource after applying substitutions based on route data. 
        /// 
        ///  
        ///  
        public string GetSubstitutedVirtualPath(RequestContext requestContext) {
            if (requestContext == null) { 
                throw new ArgumentNullException("requestContext");
            }

            if (!_useRouteVirtualPath) 
                return VirtualPath;
 
            VirtualPathData vpd = RouteVirtualPath.GetVirtualPath(requestContext, requestContext.RouteData.Values); 
            //
            if (vpd == null) 
                return VirtualPath;
            return "~/" + vpd.VirtualPath;
        }
    } 
}

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

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