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With URL authorization and file authorization, you can control access only to individual web pages. The next step in ensuring a secure application is to build checks into your application before attempting specific tasks or allowing certain operations. To use these techniques, you ll need to write some code.

As you saw in earlier chapters, all IPrincipal objects provide an IsInRole() method, which lets you evaluate whether a user is a member of a group. This method accepts the role name as a string name and returns true if the user is a member of that role. For example, here s how you can check if the current user is a member of the Supervisors role: if (User.IsInRole("Supervisors")) { // Do nothing, the page should be accessed as normal because the // user has administrator privileges. } else { // Don't allow this page. Instead, redirect to the home page. Response.Redirect("default.aspx"); } Remember that when using Windows authentication, you need to use the format DomainName\ GroupName or ComputerName\GroupName. Here s an example: if (User.IsInRole(@"FARIAMAT\Supervisors")) { ... } This approach works for custom groups you ve created but not for built-in groups that are defined by the operating system. If you want to check whether a user is a member of one of the built-in groups, you use this syntax: if (User.IsInRole(@"BUILTIN\Administrators")) { ... } Of course, you can also cast the User object to a WindowsPrincipal and use the overloaded version of IsInRole() that accepts the WindowsBuiltInRole enumeration, as described in 22.

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The @ prefix when using strings in C# just enables you to use the backslash without escaping it with an additional backslash. This is especially useful if you have strings with lots of backslashes. But this also means you cannot use any escape sequence (such as \n or \r) in the string. If you want to use these escape sequences, you may not use the @ prefix. However, in this case, you have to escape any backslash; otherwise, the backslash would be used as the start of an escape sequence. This means with the @ prefix you would have to write FARIAMAT\\Supervisors, for example.

.NET includes another way to enforce role and user rules. Instead of checking with the IsInRole() method, you can use the PrincipalPermission class from the System.Security.Permissions namespace. The basic strategy is to create a PrincipalPermission object that represents the user or role information you require. Then, invoke the PrincipalPermission.Demand() method. If the current user doesn t meet the requirements, a SecurityException will be thrown, which you can catch (or deal with using a custom error page). The Demand() method takes two parameters one for the user name and one for the role name. You can omit either one of these parameters by supplying a null reference in its place. For example, the following code tests whether the user is a Windows administrator: try { PrincipalPermission pp = new PrincipalPermission(null, @"BUILTIN\Administrators"); pp.Demand(); // If the code reaches this point, the demand succeeded. // The current user is an administrator. } catch (SecurityException err) { // The demand failed. The current user isn't an administrator. } The advantage of this approach is that you don t need to write any conditional logic. Instead, you can simply demand all the permissions you need. This works particularly well if you need to verify that a user is a member of multiple groups. The disadvantage is that using exception handling to control the flow of your application is slower. Often, PrincipalPermission checks are used in addition to web.config rules as a failsafe. In other words, you can call Demand() to ensure that even if a web.config file has been inadvertently modified, users in the wrong groups won t be allowed.

While they share a name with the original MVC definition, Django views have little else in common with the traditional paradigm. Instead, they combine some of the traditional view s responsibility with the entirety of the controller s tasks. A view accepts user input, including simple requests for information; behaves according to the application s interaction logic; and returns a display that is suitable for users to access the data represented by models.

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