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WSE provides programmatic hooks in the specifications that automatically generate the required SOAP elements for you, so you do not have to construct them manually. The WSE API is accessed differently by Web services versus Web service clients. Let s briefly look at the differences.
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Web services can access the SoapContext for either request or response SOAP messages using specialized classes called RequestSoapContext and ResponseSoapContext. These classes provide direct access to SOAP messages, and they support messages that are transported over different protocols, including the HTTP and TCP protocols. Each of the classes provides a static property called Current, which furnishes a reference to the SoapContext class. For request messages, the SoapContext class is accessed using
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SoapContext requestContext = RequestSoapContext.Current;
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RequestSoapContext is a class provided by the WebServicesClientProtocol, and Current is a static property that returns the SoapContext class. For response messages, the SoapContext class is accessed using
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SoapContext responseContext = ResponseSoapContext.Current;
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Once the client references the SoapContext for the request message, it can reference or assign WS-Specifications with the WSE API. For example, if the incoming request message requires digital signing with a certificate, then the
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Web Services Enhancements 2.0
Web service can inspect the attached digital signatures using SoapContext (as shown in Listing 5-4 earlier). The Web service can also use SoapContext to modify outgoing response messages. Unlike the service proxy class (described in the next section), the Web service itself does not need to derive from a specialized class in order to access the WSE functionality. However, you need to make sure the WSE support assemblies are correctly registered in the service s web.config file.
Web Service Client Access to the WSE API
A Web service client interacts with a Web service via a proxy class. WSE provides a new base class for this proxy class to inherit from
Microsoft.Web.Services.WebServicesClientProtocol
Without WSE installed, proxy class files inherit from
System.Web.Services.Protocols.SoapHttpClientProtocol
The WebServicesClientProtocol class provides access to the SoapContext class for both request and response messages, via the proxy class. Listing 5-5 shows an example of a Web client that is digitally signing a SOAP request message before sending it out to a service. The listing shows how you reference the SoapContext and then use it to assign the digital signature to the SOAP request message.
Listing 5-5. Digitally Signing a SOAP Request Message via the SoapContext
using Microsoft.Web.Services2; using Microsoft.Web.Services2.Security; using Microsoft.Web.Services2.Security.Tokens; // Retrieve the SoapContext for the outgoing SOAP request message StockTraderServiceWse serviceProxy = new StockTraderServiceWse(); // Retrieve the X509 certificate from the CurrentUserStore certificate store X509SecurityToken token = GetSigningToken(); // Add signature element to a security section on the request to sign the request serviceProxy.RequestSoapContext.Security.Tokens.Add( token ); serviceProxy.RequestSoapContext.Security.Elements.Add( new MessageSignature( token ) );
5
This concludes the introduction to the WSE 2.0 API. The remaining chapters in the book are dedicated to showing you how to use the WSE API to implement the WS-Specifications in your own service-oriented applications.
Install and Configure WSE 2.0
WSE 2.0 is easy to install and to configure. During setup, the only thing to watch out for is to choose the correct setup type for what you need to do. Developers who are using Visual Studio .NET 2003 should select the Visual Studio Developer setup option, as shown in Figure 5-2. If you are running an earlier version of Visual Studio, then I strongly recommend that you upgrade your version before installing WSE 2.0. Otherwise, you will not be able to take advantage of a number of useful productivity tools and utilities, some of which integrate directly with Visual Studio .NET.
Figure 5-2. WSE 2.0 Setup Option screen WSE 2.0 is a package of QuickStart sample applications and documentation that show you how to use the various classes in the WSE assembly. But the engine of WSE 2.0 is a single assembly called Microsoft.Web.Services2.dll, which is installed by default under C:\Program Files\Microsoft WSE\v2.0. In addition, this assembly gets automatically registered in the Global Assembly Cache (GAC).
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