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The EnableClientValidation method merely turns on a flag in ViewContext. It s the BeginForm form helper method that emits the pertinent client-side scripts to enable validation. The EnableClientValidation needs to be placed before the BeginForm method in your view to correctly enable scripts. In our original screen with company name and email address, the model metadata is emitted as a set of JSON objects. This JSON, shown in figure 15.5, includes the model metadata information, validation information, and model information in the form of a well-structured JSON object. The generated validation information combines with the MVC validation library to act as a bridge between the client-side validation framework and the server-side model metadata emitted as JSON. For example, we can see in figure 15.5 that there seems to be some information about the CompanyName field, as well as a validation message for the required field validation.

(Of course, in this case, the request happened to be one that allowed the attacker to change her login credential to a known value, and thus ultimately gave him full read and write access to her account) Since this attack pattern involves requests across the boundary of a web application or site with parameters that were specified or forged by the malicious site, it is often referred to as cross-site request forgery (commonly abbreviated XSRF or CSRF, and sometimes also referred to as cross-site reference forgery ) (Burns 2005) XSRF is of concern with any web application that keeps server-side state or executes server-side transactions on behalf of its users.

Figure 1-1. The GIMP Other, less visible basics of GUI development, such as synchronous and asynchronous event processing, are supported mainly by other libraries. Yet, GTK+ does give access to many of them through its own API. A 2-D vector graphics rendering library called Cairo has provided the rendering capabilities to GTK+ since the release of version 2.8. Cairo was created to render vector graphics consistently across all platforms and systems. It also allows the window manager to take advantage of hardware acceleration where available. Cairo itself will not be covered in this book, with the exception of how it relates to GTK+ s printing API, since its calls lie underneath the layers of GTK+ that you will be interacting with. It is an important aspect you will want to explore if you later choose to hack the GTK+ source code. You can visit www.cairographics.org to find more information about Cairo.

With our custom validators in place, we can now exercise client-side validation by submitting our form with missing company name information. The result doesn t post back, as shown in figure 15.6.

handle = gtk_handle_box_new (); label = gtk_label_new ("Detach Me"); /* Add a shadow to the handle box, set the handle position on the left and * set the snap edge to the top of the widget */ gtk_handle_box_set_shadow_type (GTK_HANDLE_BOX (handle), GTK_SHADOW_IN); gtk_handle_box_set_handle_position (GTK_HANDLE_BOX (handle), GTK_POS_LEFT); gtk_handle_box_set_snap_edge (GTK_HANDLE_BOX (handle), GTK_POS_TOP); gtk_container_add (GTK_CONTAINER (handle), label); gtk_container_add (GTK_CONTAINER (window), handle); gtk_widget_show_all (window); gtk_main (); return 0; } When you create a GtkHandleBox widget, you need to decide where the handle and the snap edge will be placed The handle is the area on the side of the child widget that you grab onto in order to detach the GtkHandleBox child from its parent When the handle box is detached from the parent, a slim ghost is drawn in the original location The function gtk_handle_box_set_handle_position() is used to set the position of the handle.

Because our server-side validation is still in place, we can be confident that even browsers without JavaScript available or enabled will still have validation executed. ASP.NET MVC 2 also supports custom validators, with plug-ins for both server and client-side behavior. It s up to the developers to decide how much richness is needed in the client-side behavior.

Examples of such applications include the following: Applications with features that allow users to maintain or update profile information, such as user/login ID, name, contact e-mail, password, list of friends in a social network application, and so on Applications that enable users to send messages or post messages on a message board (a malicious page could send/post an embarrassing message on behalf of an unsuspecting user) Applications that carry out financial or e-commerce transactions on behalf of their users, such as funds transfers, online shopping orders, and so forth Applications that store any kind of data on behalf of a user that could be maliciously tampered with by an attacker (online calendaring, to-do lists, personal information managers, etc)..