qr code scanner java app Introducing JBoss Seam in Java

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Introducing JBoss Seam
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17.3.4 Completing the login/logout feature
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The navigation rules for the login/logout feature are missing. These are in facesconfig.xml for JSF:
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<navigation-rule> <navigation-case> <from-outcome>login</from-outcome> <to-view-id>/login.xhtml</to-view-id> <redirect/> </navigation-case> <navigation-case> <from-outcome>start</from-outcome> <to-view-id>/catalog.xhtml</to-view-id> </navigation-case> </navigation-rule>
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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).
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Listing 17.14 An EJB 3.0 interceptor that checks the logged-in token
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package auction.interceptors; import ... @Name("loginInterceptor")
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Understanding contextual components
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@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"; } } }
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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
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Introducing JBoss Seam
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:
<pages> <page view-id="/catalog.xhtml" action="#{loginInterceptor.checkLoggedIn}"/> </pages>
When a user hits the /catalog.jsf URL directly, the loginInterceptor.checkLoggedIn() action runs. If this action has a non-null outcome, Seam treats the outcome as a regular JSF outcome and the navigation rules apply. Finally, you protect your component methods by applying the interceptor to an EJB class. This can be done in XML (META-INF/ejb-jar.xml), which is great if you want to use wildcards and protect all beans in a particular package. Or, you can write a helper annotation that encapsulates the interceptor:
package auction.interceptors; import ... @Target(TYPE) @Retention(RUNTIME) @Documented @Interceptors(LoggedInInterceptor.class) public @interface LoggedIn { public static final String LOGIN_TOKEN }
= "loggedIn";
This annotation also contains the string constant to which all the other code refers, which is convenient. Now, apply this annotation on an EJB class:
package auction.beans; import ... @Name("catalog") @LoggedIn @Stateful public class CatalogBean implements Catalog { ... }
Whenever any method of this EJB is called, the LoggedInInterceptor runs and validates that the user is logged in. If the user isn t logged in, the interceptor returns the login outcome to JSF. You can also check for the logged-in token on a page for example, if you have to decide whether the Logout button should be rendered:
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