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In 23, you ll learn how to protect specific pages and folders using authorization rules These authorization rules can prevent anonymous users from accessing sensitive content, regardless of what type of authentication system you re using You can also use authorization rules to lock out specific users, roles, or Windows groups This creates a bit of a challenge if you re using a single site map for all users The problem is that the site map may include some pages that are accessible only to certain classes of users For example, all users will see a link to an Adminaspx page, even though you may have used authorization rules that explicitly prevent most people from accessing this page To prevent the confusion, you can use an often-overlooked site map feature called security trimming.

Using the same moveToPosition call on the Cursor object as we did previously, we can get at the song that was actually selected. In this case, we are getting at the column that contains the path to the file and the MIME-type of that file. We are converting it to a File and creating an intent to start the built-in music player application.

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When security trimming is switched on, all the pages that a user wouldn t be allowed to access (based on authorization rules) are left out of the site map altogether This means non-admin users won t see the link to the Adminaspx page And if you ve used authorization rules to create separate groups of pages for separate roles, every user will see just the appropriate pages To turn on security trimming, you need to use the securityTrimmingEnabled attribute when you register the site map provider in the webconfig file Although you could edit the root webconfig file on the web server, the easiest option is to simply add the standard site map provider with the new configuration settings, as shown here: <configuration> <systemweb> <siteMap defaultProvider="SecureSiteMapProvider "> <add name="SecureSiteMapProvider" type="SystemWebXmlSiteMapProvider " siteMapFile="Websitemap" securityTrimmingEnabled="true" /> </providers> </siteMap> .. </system.

web> </configuration> When you switch on security trimming, it automatically applies to all the nodes in your site map file However, you can opt out If you know specific sections of your site map should be shown to all people or if you don t want to use security trimming to hide certain pages, you can explicitly turn security trimming off for a portion of the site map To do so, you need to set the roles attribute for that node to an asterisk (*), as shown here: <siteMapNode title="Admin " description="Administration" url="~/Adminaspx" roles="*" >.

int fileColumn = cursor.getColumnIndex (MediaStore.Audio.Media.DATA); int mimeTypeColumn = cursor.getColumnIndex (MediaStore.Audio.Media.MIME_TYPE); String audioFilePath = cursor.getString(fileColumn); String mimeType = cursor.getString(mimeTypeColumn); Intent intent = new Intent(android.content.Intent.ACTION_VIEW); File newFile = new File(audioFilePath); intent.setDataAndType(Uri.fromFile(newFile), mimeType); startActivity(intent); } } } }

Now the Services node is visible to everyone, regardless of their role, even if security trimming is switched on. You might take this step for several reasons: To ensure good performance: The fewer nodes ASP.NET needs to check, the less overhead it applies to each request. To make it easier for people to use a secure page as a starting point: For example, an administrator might want to surf to your website and click the Admin.aspx link before logging in. At this point, the administrator will be sent to a login page (assuming you re using forms authentication), authenticated, and then redirected back to the Admin.aspx page. But if the Admin.aspx page isn t visible, the site isn t quite as easy to use. The administrator would need to surf to the login page first and then surf to the Admin.aspx page. To prevent child nodes from being hidden: For example, if the Administration node contains other nodes that aren t secured (such as Meet Our Administrators), these nodes will be hidden when the Administration node is hidden. This problem usually indicates a poor site map design. The value of the roles attribute is not passed down to nested nodes. This means if there are other nodes contained inside the Administration node and these nodes point to protected pages that you want to show in the site map, you ll need to add the roles="*" attribute to each one.

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