1//===============================================================================================
  2//
  3// (c) Copyright Microsoft Corporation.
  4// This source is subject to the Microsoft Permissive License.
  5// See http://www.microsoft.com/resources/sharedsource/licensingbasics/sharedsourcelicenses.mspx.
  6// All other rights reserved.
  7//
  8//===============================================================================================
  9
 10using System;
 11using System.Data;
 12using System.Configuration;
 13using System.Web;
 14using System.Web.Security;
 15using System.Web.UI;
 16using System.Web.UI.WebControls;
 17using System.Web.UI.WebControls.WebParts;
 18using System.Web.UI.HtmlControls;
 19
 20namespace MyWebPagesStarterKit.Providers
 21...{
 22    /**//// <summary>
 23    /// Specialized XmlSiteMapProvider that implements some special behaviour
 24    /// </summary>
 25    public class CustomXmlSitemapProvider : XmlSiteMapProvider
 26    ...{
 27        /**//// <summary>
 28        /// Special IsAccessibleToUser method (see code to get further explanations)
 29        /// </summary>
 30        public override bool IsAccessibleToUser(HttpContext context, SiteMapNode node)
 31        ...{
 32            //if SecurityTrimming is disabled, ALL nodes are accessible by everyone
 33            if (!SecurityTrimmingEnabled)
 34                return true;
 35
 36            //Administrators have permissions on all nodes, so we can always return true
 37            if ((context.User != null) && (context.User.Identity.IsAuthenticated) && context.User.IsInRole(RoleNames.Administrators.ToString()))
 38                return true;
 39
 40            //The RootNode must be accessible for everyone
 41            if (node.ParentNode == null) //if there is no parent-node, the node must be the root node
 42                return true;
 43
 44            //special behaviour for nodes that have a pageId attribute (content-pages)
 45            if (node["pageId"] != null)
 46            ...{
 47                //first we create the WebPage for the node
 48                WebPage page = new WebPage(node["pageId"]);
 49                //now check, if we have a logged in user (in role Users)
 50                if ((context.User != null) && context.User.Identity.IsAuthenticated)
 51                ...{
 52                    //we have a authenticated user, therefore the only thing that counts is, if the page is visible
 53                    return page.Visible;
 54                }
 55                else
 56                ...{
 57                    //anonymous user -> we must check if the page is visible, and if it allows anonymous access
 58                    return ((page.Visible) && (page.AllowAnonymousAccess));
 59                }
 60            }
 61            else
 62            ...{
 63                //if there is no pageId attribute on the node, it is a administration-node
 64                //therefore it must not be shown to non-admin users (admin-users are handled further up)
 65                return false;
 66            }
 67        }
 68
 69        /**//// <summary>
 70        /// Find a SiteMapNode by a give pageId. This method is used recursive.
 71        /// </summary>
 72        /// <param name="key">The pageId</param>
 73        /// <param name="node">Starting node</param>
 74        /// <returns></returns>
 75        public SiteMapNode FindSiteMapNodeFromPageId(string key, SiteMapNode node)
 76        ...{
 77            //Get all ChildNodes of the starting node
 78            foreach (SiteMapNode n in GetChildNodes(node))
 79            ...{
 80                //if tha pageId attribute matches the key, we're done and can return the found node
 81                if (n["pageId"] == key)
 82                ...{
 83                    return n;
 84                }
 85                //otherwise we try to find the SiteMapNode in the childnodes of the current node
 86                else
 87                ...{
 88                    SiteMapNode candidate = FindSiteMapNodeFromPageId(key, n);
 89                    if (candidate != null)
 90                        return candidate;
 91                }
 92            }
 93            //if no node with the given pageId is found, we return null
 94            return null;
 95        }
 96
 97        /**//// <summary>
 98        /// Resolve eventhandler to get the SiteMapNode corresponding to the currently displayed page
 99        /// </summary>
100        public static SiteMapNode Resolve(object sender, SiteMapResolveEventArgs e)
101        ...{
102            //check, if a CurrentNode could already be determined by the default XmlSiteMapProvider (base class).
103            //if this is not the case and we have a pg-element in the querystring, we must call the FindSiteMapNodeFromPageId-method to find the CurrentNode by pageId
104            //this eventhandler is registered in global.asax, in the "Application_Start" Event
105            if ((e.Provider.CurrentNode == null) && (e.Context.Request.QueryString["pg"] != null))
106            ...{
107                return ((CustomXmlSitemapProvider)e.Provider).FindSiteMapNodeFromPageId(e.Context.Request.QueryString["pg"], SiteMap.RootNode);
108            }
109            else
110            ...{
111                return e.Provider.CurrentNode;
112            }
113        }
114    }
115}
116