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ASP .NET doesn t understand PTPrincipal and PTIdentity objects, so PTWeb includes its own custom membership provider.
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A membership provider is an object that inherits from System.Web.Security.MembershipProvider to handle all aspects of membership. These aspects include: Validating user credentials Adding a new user Deleting a user Changing a user s password And more . . . Of course, PTPrincipal doesn t understand all these things, and ProjectTracker.Library doesn t implement a full set of membership objects either. If you want to support all these capabilities, you should create your own security library with appropriate objects. But PTPrincipal does understand how to validate a user s credentials. Fortunately, it is possible to implement a subset of the complete membership provider functionality, and that s what I do in PTWeb. The PTMembershipProvider class is in the App_Code directory, so ASP .NET automatically compiles it and makes it available to the website. This class inherits from MembershipProvider and overrides the ValidateUser() method: public class PTMembershipProvider : MembershipProvider { public override bool ValidateUser( string username, string password) { bool result = PTPrincipal.Login(username, password); HttpContext.Current.Session["CslaPrincipal"] = Csla.ApplicationContext.User; return result; } // other methods } All other methods are overridden to throw an exception indicating that they aren t implemented by this provider. Notice how the ValidateUser() method already accepts username and password parameters. This is convenient because the Login() method of PTPrincipal accepts those parameters as well. The code simply calls the Login() method and records the result; true if the user was logged in, false otherwise. Remember from 8 that the Login() method sets the User property of Csla.ApplicationContext, thus automatically setting either the Thread object s CurrentPrincipal property or the HttpContext.Current.User property to an authenticated PTPrincipal if the user s credentials were valid; otherwise, it is set to an unauthenticated PTPrincipal. Since this code will be running within ASP.NET, it is the HttpContext value that is set to the user s principal. The code then sets a Session field, CslaPrincipal, to contain this principal value so it will be available to subsequent pages. Then the result value is returned. The ASP.NET membership infrastructure relies on this return value to know whether the user s credentials were valid or not. Before this custom membership provider can be used, it must be defined in web.config as follows:
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<membership defaultProvider="PTMembershipProvider"> <providers> <add name="PTMembershipProvider" type="PTMembershipProvider" enablePasswordRetrieval="false" enablePasswordReset="false" requiresQuestionAndAnswer="false" applicationName="/" requiresUniqueEmail="false" passwordFormat="Clear" description="Stores and retrieves membership data using CSLA .NET business objects." /> </providers> </membership> By making PTMembershipProvider the default provider, this definition tells ASP.NET to automatically use it for any membership activities, including validating a user s credentials.
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At this point, you ve seen how the user can log in or out using the LoginStatus control on the master page. And you ve seen how Login.aspx and the custom membership provider are used to gather and validate the user s credentials. But how does the principal object carry forward from page to page Remember that the web technologies are stateless by default, and it is up to the web developer to manually implement state management as she chooses. Unfortunately, this extends to the user s identity as well. The forms-based security infrastructure provided by ASP.NET writes an encrypted cookie to the user s browser. That cookie contains a security ticket with a unique identifier for the user, the user s name, and an expiration time. This cookie flows from the browser to the web server on each page request, so that basic information is available. Notice, however, that the cookie doesn t include the principal and identity objects. That is because those objects could be quite large, and in some cases, might not even be serializable. Though PTPrincipal and PTIdentity are serializable, they could still be large enough to pose a problem if you tried to write them to the cookie. Cookies have a size limit, and remember that PTIdentity contains an array with all the role names for the user. Given a large number of roles or lengthy role names, this could easily add up to a lot of bytes of data.
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