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When a user successfully logs in, the start outcome of the action takes the browser to the start page of the application, which in CaveatEmptor is the catalog of auction items. When a user logs out (by clicking a button that is bound to the login.doLogout() method), the login outcome is returned, and /login.xhtml is rendered. The rule you define here also says that this is done via browser redirect. This approach has two consequences: First, the user sees /login.jsf as the URL in the browser; and second, the redirect is done immediately after the Invoke Application phase, after doLogout() executes. You need this redirect to start a fresh HTTP session in the following Render Response phase. The old HTTP session is marked invalid by doLogout() and is discarded after the Invoke Application phase. The application isn t really secure. Although users end up on the login page when they open the application, they can bookmark other pages (like the auction item catalog) and jump directly to a URL. You need to protect the pages and redirect the user to the login page, if no logged-in token is present. You also need to protect component bean methods directly, in case the user finds a way to execute an action without rendering the page first. (This is possible with Seam components that are exposed through JavaScript.) You protect component methods with an EJB 3.0 interceptor (listing 17.14).

Page 1-14

1. After Windows XP Service Pack 2 is installed, Internet Explorer combines many of the common dialog boxes that prompt users for information into a common area named the _______________. Fill in the blanks.

package auction.interceptors; import ... @Name("loginInterceptor")

2. Which of the following is true of Windows Firewall Choose all that apply. a. Windows Firewall is enabled by default. b. Windows Firewall is disabled by default. c. Windows Firewall must be configured individually for each connection. d. Windows Firewall protects a network connection as soon as the connection is active on the network.

A and D are correct. Windows Firewall is enabled by default and begins protecting a network connection as soon as the connection is active on the network. B is not correct because Windows Firewall is enabled by default. C is not correct because you can configure global settings for Windows Firewall that affect all connections (although you can configure connections individually if you want to).

@Interceptor(around={BijectionInterceptor.class, ValidationInterceptor.class, ConversationInterceptor.class, BusinessProcessInterceptor.class}, within= RemoveInterceptor.class) public class LoggedInInterceptor { @AroundInvoke public Object checkLoggedIn(InvocationContext invocation) throws Exception { String loggedInOutcome = checkLoggedIn(); if (loggedInOutcome == null) { return invocation.proceed(); } else { return loggedInOutcome; } } public String checkLoggedIn() { boolean isLoggedIn = Contexts.getSessionContext() .get(LoggedIn.LOGIN_TOKEN) != null; if (isLoggedIn) { return null; } else { return "login"; } } }

Page 1-19

1. Which of the following statements about a Windows XP Professional workgroup are correct Choose all that apply. a. A workgroup is also called a peer-to-peer network. b. A workgroup is a logical grouping of network computers that share a central directory database.

This interceptor has two uses. First, it s an EJB 3.0 @Interceptor that is executed in the middle of other EJB 3.0 interceptors. These other interceptors are all from Seam, and you need to place your own interceptors in the right position of the stack. The EJB 3.0 annotation @AroundInvoke marks the method that is called before and after any method on your protected components is called. If the checkLoggedIn() method doesn t return anything (null outcome), the invocation of the intercepted component call can proceed. If the outcome isn t null, this outcome is passed on to the JSF navigation handler, and the intercepted component call doesn t proceed. The interceptor class is also a Seam plain Java component (Seam components don t have to be EJBs) with the name loginInterceptor. The default context for a JavaBean component is the event. You can now use this component name in expressions for example, with the expression #{loginInterceptor.checkLoggedIn} without going through EJB interception. This is useful to protect the

1-38

a Web-based database hosted in Microsoft s datacenters to store inventory information gathered from client workstations.

1

pages from direct access. In Seam. you can define actions that run before a page is rendered. These declarations are in WEB-INF/pages.xml:

c. A workgroup is practical in environments with up to 100 computers. d. A workgroup can contain computers running Windows Server 2003 as long as the server is not configured as a domain controller.

A and D are correct. A is correct because in a workgroup, computers act as equals (or peers), and the arrangement is also called a peer-to-peer network. D is correct because computers running a server product might be part of a workgroup (such computers are called stand-alone servers) as long as no server is acting as a domain controller. B is not correct because each computer in a workgroup maintains its own security database instead of relying on a centralized security database. C is not correct because a workgroup begins to become impractical with more than 10 workstations not 100 workstations.