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//------------------------------------------------------------------------------
// <copyright file="WebFormRouteHandler.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
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("{");
}
/// <summary>
/// This is the full virtual path (using tilde syntax) to the WebForm page.
/// </summary>
/// <remarks>
/// Needs to be thread safe so this is only settable via ctor.
/// </remarks>
public string VirtualPath { get; private set; }
/// <summary>
/// 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.
/// </summary>
/// <value>True by default</value>
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;
}
/// <summary>
/// Gets the virtual path to the resource after applying substitutions based on route data.
/// </summary>
/// <param name="requestContext"></param>
/// <returns></returns>
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;
}
}
}
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