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Note This chapter focuses on transforming XML for presentation, but the same distinction between server-side and client-side transformations can be made for XML-to-XML transformations as well the XML is transformed into the desired format either in the application that is the source of the XML or in the application that receives the XML.

A more typical example is the MD5 algorithm, which will reduce a message of any length to 16 representative bytes. The chances of any two messages producing the same digest are astronomically small, and it is effectively impossible to reverse-engineer the original message from its MD5 hash. This makes the MD5 hash perfect for confirming a password over a network. The remote server will send the client a random salt text. This is added by the client to the password, and the digest is computed. The client sends the digest to the server, which will compute the digest independently and compare it with the client s digest. If they match, both machines must know the password, but an eavesdropper cannot reproduce the digest independently (without knowing the password). The use of a salt prevents a third party from simply retransmitting the digest, since it will be different for every salt value.

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With server-side transformations, the client makes a single request for a page, and the server returns a single page to the client. When the server receives a request, it identifies the XML that holds the data for the page to use and what XSLT stylesheet to use with it. The server then performs the transformation and returns the result of the transformation to the client. This process is illustrated in Figure 15-1.

To test the completed application, press F5 on your keyboard and run it. In this brief demo, you ve learned to work with isolated storage files by storing a downloaded image into the isolated storage and then retrieving the image from the isolated storage. In the next demo, you will learn to interact with the name and value dictionary of the isolated storage settings.

Assuming that the standard web protocol (HTTP) is being used, the server can work out what information the client should receive by looking at the headers of the request, which include the URL that s being requested and information about the client that s making the request. Based on this, the server can deliver different information according to the client different HTML or XHTML for different web browsers, even XML if the client is one that can carry out client-side transformations. The server, and therefore the developer of the application, is in control of what stylesheet is used and what kind of result the client sees. As far as the client is concerned, the server is just like any other the client can t tell what s going on behind the scenes and doesn t know that the page is automatically generated. Server-side transformations have a disadvantage in that they place a heavy load on the server. If 100 clients request XML pages in a minute, then the server has to perform those 100 transformations itself, and deliver the results, within a reasonable timeframe. While each individual transformation might be manageable, 100 transformations might not be, especially if those transformations take a long time or, more importantly, involve high memory use. On the plus side, server-side transformations can make sensible use of caches, to enable the server to store the results of common transformations so that it doesn t have to run them owever, this is only beneficial

Form-based authentication is one of the most commonly used forms of authentication, largely because it can be made secure and offers cosmetic advantages over web client managed mechanisms. The username and password are submitted as plaintext in a form request. If the POST mechanism is used and the connection is over HTTPS (SSL) rather than HTTP, this cannot easily be intercepted. The PortletRequest class provides the constants that are used to identify each authentication type. It is also possible that no authentication will have been carried out, in which case getAuthType() will return null. Identifying the User The getRemoteUser() method provides the username of the current user of the portal. The username is generally not considered to be a sensitive piece of infor212

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