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A simpler approach to force the user to log in that is more Faces-centric is to use a PhaseListener This idea was originated by Aaron L Bartell on the JSF-developers mailing list and is adapted here to suit the Virtual Trainer Recall from 12 how PhaseListener instances are installed and declared in the faces-configxml In this case, they are installed in the faces-configxml that accompanies the trainercomponents JSF component library
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package comjsfcompreftrainercomponentsutil; import import import import import import import javaioIOException; javaxfacesapplicationNavigationHandler; javaxfacescontextFacesContext; javaxfaceseventPhaseEvent; javaxfaceseventPhaseId; javaxfaceseventPhaseListener; comjsfcompreftrainerutil*;
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/** * * <p>The idea to use a PhaseListener for this was taken from * Aaron L Bartell on the JSF-developers mailing list</p> */ public class ForcedLoginPhaseListener implements PhaseListener { /** Creates a new instance of ForcedLoginPhaseListener */ public ForcedLoginPhaseListener() { } public PhaseId getPhaseId() { return PhaseIdRESTORE_VIEW; } public void afterPhase(PhaseEvent event) { FacesContext context = eventgetFacesContext(); // Check to see if they are on the login page boolean onLoginPage = (-1 != contextgetViewRoot()getViewId()
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lastIndexOf("login")) true : false, isLoggedIn = false; try { isLoggedIn = ForcedLoginFiltercheckLoginState(context getExternalContext()getRequest()); } catch (Exception e) { // A production-quality implementation would log the exception } if (!onLoginPage && !isLoggedIn) { contextgetApplication()getNavigationHandler() handleNavigation(context, null, "login"); } } public void beforePhase(PhaseEvent event) { } }
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This technique shows a novel approach to using the NavigationHandler programmatically, but introduces a possibly undesirable coupling between the application s page flow as specified in the faces-configxml file and the component, which expects a navigation-rule for the from-outcome named login to exist Now that we ve implemented a basic but secure container-managed authentication scheme, let s move on to providing role-based access control using managed beans
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Implementing a Remember Me Feature
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A popular feature of Web applications that require security is a simple checkbox, often with the label Remember Me, that causes the Web site to automatically log the user in, or populate the user ID and password fields in the UI with the proper values the next time they return to the site Here, you ll see how to extend the 9 Virtual Trainer with this useful feature As with many things in Faces, this problem is best solved with a custom UIComponent This particular design for the RememberMeLoginComponent takes advantage of several subtleties of advanced JSF custom component techniques, so we will cover the component in detail While not all of the source code for the component will be shown in this text, the complete code is available in the online code for this book The operation of the RememberMeLoginComponent is shown in Figure 15-4 The RememberMeLoginComponent extends the FormBasedLoginComponent shown earlier in the chapter and adds a checkbox below the row of buttons It is a composite component, containing several other components, but is presented to the page author
FIGURE 15-4 The RememberMeLoginComponent in operation
15:
Securing JavaServer Faces Applications
as a single component The first time a user encounters the login page using the RememberMeLoginComponent, they have the option of checking the checkbox If they do so, and if the login is successful, a Cookie is set into the response The next time they visit the login page, the RememberMeLoginComponent examines the cookie and prepopulates the fields of the login page with the saved username and password values The page author experience of using this component is very simple and was designed to be dropped into the existing login page from the trainer application Recall that the original login page used component bindings for the username and password fields, and a MethodBinding for the button action, all of which were exposed on the backing bean called Authentication_Backing The rememberMeLogin exposes usernameBinding, passwordBinding, and buttonAction attributes for the component bindings and method bindings, respectively These three attributes are required, but additional optional attributes are provided to allow localization The general form for the tag follows:
<vt:rememberMeLogin id="optionalId" usernameLabel="Username: " passwordLabel="Password: " buttonLabel="Login" resetButtonLabel="Reset" usernameBinding="#{Authentication_Backinguserid}" passwordBinding="#{Authentication_Backingpassword}" buttonAction="#{Authentication_Backinglogin}"/>
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