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Encrypted message body </xenc:CipherValue> </xenc:CipherData> </xenc:EncryptedData> </soap:Body> </soap:Envelope> The main difference between Listing 6-1 and Listing 6-2 is the addition of WS-Security tags in the request header and an encrypted message body. You can notice that the value of the symbol parameter is not readable in Listing 6-2. This is a clear example of Web service composability, where additional specifications may be added or subtracted to a SOAP message as needed. WSE provides the API for implementing WS-Security in .NET-based Web services and client applications. The API allows you to write code to format secured SOAP request messages in the client and to process secured messages within a Web service.

prepare(): Compiles a query and returns a PDOStatement object or FALSE if there is an error. This offers better performance than query() for statements that need to be executed multiple times, because it can be reset, avoiding the need to recompile the query.

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Note I ve had people tell me that this is an overly paranoid attitude, but I ve been burned too many times: any time an interface is exposed (Windows, web, XML, and so on) so that clients outside your control can use it, you should assume that the interface will be misused. Often, this misuse is unintentional for example, someone may write a buggy macro to automate data entry. That s no different than if they made a typo while entering the data by hand, but user-entered data is always validated before being accepted by an application. The same must be true for automated data entry as well, or your application will fail.

This scenario occurs in three main architectures: Windows smart clients, rich Internet applications (RIAs), and SOA systems. If you deploy a WPF or Windows Forms client application to external workstations, you should design it as a stand-alone application that calls your server application through services. 21 shows how you can do this with the object-oriented concepts in this book. You may create an RIA with asynchronous JavaScript and XML (Ajax) technologies or newer technologies such as Silverlight. In either case, the RIA often validates data or otherwise provides a richer experience for the user, but your server code should assume that the RIA didn t do anything it was supposed to do. It is far too easy for a user to subvert your client-side JavaScript or otherwise bypass client-side processing as such, nothing running in an RIA can be trusted. The code running in the browser should be viewed as a separate application that is not trusted by the server application. Service-oriented systems imply that there s one or more (potentially unknown) applications out there consuming your services. The very nature of SOA means that you have no control over those applications, so it would be foolish to assume they ll provide valid input to your services. A healthy dose of paranoia is critical when building any service for an SOA system. As you ll see, you can use the object-oriented concepts and techniques shown in this book to create smart client applications that call services on your servers. You can use the same concepts to create the services themselves. You can also use them to create web applications ranging from simple Web Forms to Ajax to Silverlight.

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