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Although classic web applications usually remember the state of the application at the server side, Ajax (and thus, GWT) applications tend to do that on the client, to better take advantage of JavaScript code However, this might tempt a developer to implement security controls at the client side, which is totally insecure An attacker could modify the code running on his PC while testing for exploitable vulnerabilities, and your server would be receiving data from a tainted source So, it s worth repeating: Security controls must be totally implemented, or at least rechecked, on the server As a consequence, never assume that any data or commands received server-side are valid You should certainly run checks and do validations at the client to provide a more fluid experience to the end user (and in fact we saw such a pattern, PreValidation, in 6, Communicating with Your Server ) but that won t enable you to skip any controls at the server3

dijit/form/TabContainerjs Use dojorequire("dijitlayoutTabContainer"); This class creates a widget that acts as a container for ContentPane widgets A TabController is automatically created to allow each child ContentPane to be selected This widget works very much like a StackContainer except the controller is built automatically and doesn t require a separate tag Also the controller displays as tabs instead of buttons Remember, the content for the tabs is also dynamic and can be retrieved from the server using an Ajax request when the tab is selected and the ContentPane is displayed This is determined by setting the href property on the ContentPane

} return courses; }

Notice that in the first example, the Tab 3 has a special icon (a dark circle with a white X) that allows the user to close the tab so that it completely disappears from the page

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Cryptography has several uses, and we will apply both encryption and hashing The first term means transforming a plain text into an unreadable crypto text that can be transformed back into the original only by using an appropriate key, and thus provides for security against Eve, whom we met earlier in this chapter The second term, hashing, refers to a way of producing a fixed-size digest from a given text, in such a way that any changes to the text imply changes in the digest If you are given a text and a digest, if they do not match, you can be sure there s been some tampering with the data, whereas if there s a match, it s highly likely the text hasn t been modified4 Before we go any further, don t become tempted with the idea of producing your own super-duper-ultra-highly obfuscated cryptographic method; published standard methods (such as AES, RSA, and many more; just google for Cryptography, and you ll get plenty of references) have withstood analysis, checks, verifications, and attacks, and it s unlikely any method thrown together in a short while can endure the same kind of tests Also, do not ever rely on Security through Obscurity, assuming that the would-be attackers won t guess what you did In particular, never assume that GWT s code obfuscation will be enough to protect your code; a determined programmer will be able to deduce your algorithms and methods, and you ll be left wide open to all kinds of attacks

Listing 15-10 shows the assembly attributes from the file assemblyinfocs The name of the application is set with the attribute class ApplicationNameAttribute; the application is configured as a server application with the option Activation-OptionServer With the attribute [SecurityRole], the roles that are created with the application are defined

<div id="sc1" dojoType="dijitlayoutTabContainer" style="width: 100%; height: 10em;"> <div dojoType="dijitlayoutContentPane" title="Tab 1"> First Content Pane </div> <div dojoType="dijitlayoutContentPane" title="Tab 2"> Second Content Pane </div> <div dojoType="dijitlayoutContentPane" title="Tab 3"> Third Content Pane </div>

[assembly: AssemblyDelaySign(false)] [assembly: AssemblyKeyFile("////coursekeysnk")] [assembly: AssemblyKeyName("")] [assembly: ApplicationName("Course Management")] [assembly: Description("Sample Application")] [assembly: ApplicationActivation(ActivationOptionServer)] [assembly: SecurityRole("Partner", true)] [assembly: SecurityRole("Course Admin")] [assembly: SecurityRole("Course Assistant")] [assembly: SecurityRole("Sales")] [assembly: ApplicationAccessControl(true, AccessChecksLevel= AccessChecksLevelOptionApplicationComponent)]

3 Note that this doesn t imply coding everything twice; you can easily share tests between clientand server-side code, because everything is written in Java 4 The standard reference for Cryptography is Bruce Schneier s Applied Cryptography ; check it at wwwschneiercom/book-appliedhtml, but also read his Practical Cryptography (check wwwschneiercom/book-practicalhtml) for real-life practical considerations before you plunge forward applying methods right and left

</div> JavaScript Constructor Examples The following code will create a new TabContainer widget containing two ContentPane widgets

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