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Once you have the Login() method in place, it makes sense to create a private method that can be called to verify that a user is present. You can then call this method from other web methods in your web service. The following AuthorizeUser() method checks for a matching ticket and returns the TicketIdentity if it s found. If not, an exception is thrown, which will be returned to the client. private TicketIdentity AuthorizeUser(string ticket) { TicketIdentity ticketIdentity = (TicketIdentity)Application[ticket]; if (ticket != null) { return ticketIdentity; } else { throw new SecurityException("Invalid ticket."); } } In addition, this overloaded version of AuthorizeUser() verifies that the user has a ticket and is a member of a specific role. The ASP.NET role management provider handles the role-checking work. private TicketIdentity AuthorizeUser(string ticket, string role) { TicketIdentity ticketIdentity = AuthorizeUser(ticket); if (Roles.IsUserInRole(ticketIdentity.UserName, role)) { throw new SecurityException("Insufficient permissions."); } else { return ticketIdentity; } } Using these two helper methods, you can build other web service methods that test a user s permissions before performing certain tasks or returning privileged information.

== !=

Unfortunately, few projects store anything useful in , so Django isn t likely to find anything of interest in it. In order to get at anything really useful, it would have to perform some extra work to traverse the package structure to get a module that contained some pertinent information. Instead, since Django has to use a module object anyway, it makes more sense to use a module that contains useful information right off the bat. For the majority of applications, the most useful module in a package is , where all the Django models are defined. Therefore, Django uses this module to recognize an application. Some of the following methods return an application, and in each case, it returns the module within the application s package.

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Now you simply need to create a test web method that uses the AuthorizeUser() method to check that the user has the required permissions. Here s an example that checks that the client is an administrator before allowing the client to retrieve the DataSet with the employee list: [WebMethod()] [SoapHeader("Ticket", Direction = SoapHeaderDirection.In)] public DataSet GetEmployees() { AuthorizeUser(Ticket.Ticket, "Administrator"); ... } To make the test even easier to set up, the sample code for this chapter includes a CreateTestUser() web method that generates a specific user and makes that user part of the Administrators role:

[WebMethod()] public void CreateTestUser(string username, string password) { // Delete the user if the user already exists. if (Membership.GetUser(username) != null) { Membership.DeleteUser(username); } // Create the user. Membership.CreateUser(username, password); // Make this user an administrator // and create the role if it doesn't exist. string role = "Administrator"; if (!Roles.RoleExists(role)) { Roles.CreateRole(role); } Roles.AddUserToRole(username, role); } Now you can create a client that tests this. In this case, a web page provides two text boxes for the user to supply a user name and password (see Figure 34-3). This information is passed to the Login() method, and then the GetEmployees() method is called to retrieve the data. This method succeeds for a user with the Administrator role but fails for everyone else.

Figure 34-3. Testing a web method that uses ticket-based authorization Here s the web-page code: protected void cmdCall_Click(object sender, System.EventArgs e) { SoapSecurityService proxy = new SoapSecurityService();

try { proxy.Login(txtUserName.Text, txtPassword.Text); GridView1.DataSource = proxy.GetEmployees(); GridView1.DataBind(); } catch (Exception err) { lblInfo.Text = err.Message; } } The best part is that the client doesn t need to be aware of the ticket management. That s because the Login() method issues the ticket, and the proxy class maintains it. As long as the client uses the same instance of the proxy class, the same ticket value will be submitted automatically, and the user will be authenticated. You can do quite a bit to enhance this authentication system. For example, you might want to record additional details with the TicketIdentity, including the time the ticket was created and last accessed and the network address of the user who owns the ticket. This way, you can incorporate additional checks into the AuthorizeUser() method. You could have tickets time out after a long period of disuse, or you could reject a ticket if the IP address of the client has changed.

The first step in a site-wide introspection is to determine what applications are installed. Calling will return such a list, containing the application module for each application in the setting that contains a module. That s not to say that it only returns applications that have models. It actually checks for the presence of a module, so even an empty will cause an application to be included in this list. Take, for example, the following setting, showing several of Django s own contributed applications, as well as some in-house applications and the application described in 7.

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