Communicating via Web Services in VS .NET

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Communicating via Web Services
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Communicating with the user is not the only job of an NTD application Very often an application must also communicate to the outside world In the partially trusted zones, this communication is limited to talking back only to the originating site and only via HTTP requests and Web services Luckily, the originating site is often what we want to talk to anyway, and Web services are easily flexible enough to handle the majority of our communication needs In addition to being flexible, Web services provide a much saner model for the split of serverside and client-side code Instead of maintaining client state on the server, as a Web application often does, Web services typically provide a stateless end point that receives requests for service These requests are typically large-grained and atomic in order to reduce requests and to let the client maintain its own state Generating the client-side proxy code necessary to talk to a Web service is as easy as adding a Web Reference to your project You do this by pointing VSNET at the URL for the Web service's WSDL (as discussed in 14: Multithreaded User Interfaces) Calling a Web service is a little tricky, however, because partially trusted code isn't allowed to make Web service calls anywhere but back to the originating server It's up to you to make sure that the URL, which is hard-coded into the generated Web service proxy code, points at the originating server You can do this by replacing the site in the hard-coded URL with the site that you
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discover dynamically using the application domain's appbase: // Get a client-side Web service proxy of any type, replacing // the "localhost" site with the appbase site static SoapHttpClientProtocol GetServiceForAppBase(Type type) { // Create an instance of the service using NET Reflection SoapHttpClientProtocol service = (SoapHttpClientProtocol) typeAssemblyCreateInstance(typeFullName); try { // Set URL to server where this came from string appbase = AppDomainCurrentDomainBaseDirectory; string site = SystemSecurityPolicySiteCreateFromUrl(appbase)Name; serviceUrl = serviceUrlReplace("//localhost/", "//" + site + "/"); } // If we can't create a site from the appbase, // then we're not an NTD app and there's no reason to // adjust the service's URL catch( ArgumentException ) {} return service; } void GetHighScores() { // Get scores WahooScoresService service = (WahooScoresService) GetServiceForAppBase(typeof(WahooScoresService)); WahooScore[] scores = serviceGetScores(); // Show high scores } The GetServiceForAppBase helper creates an instance of any type of client-side Web services proxy and then, if the application is NTD, replaces the "localhost" site with the site indicated by the appbase This makes it handy not only to test your NTD application on your own machine from the MyComputer zone, but also to get the appropriate site when the NTD application is launched from an URL
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After I'd gotten the current high scores via the Web service, I found that I wanted to be able to cache them for later access (to savor the brief moment when I was at the top) NET makes it easy to read and write files and to show the File Save and File Open dialogs Unfortunately, only a limited subset of that functionality is available in partial trust Referring again to Table 151, notice that the Intranet zone has unrestricted file dialog permissions but no file I/O permissions This means that files can be read and written, but not without user interaction Unrestricted access to the file system is, of course, a security hole on par with buffer overflows and fake password dialogs To avoid this problem but still allow an application to read and write files, a file can be opened only via the File Save or File Open dialog Instead of using these dialogs to obtain a file name from the user, we use the dialogs themselves to open the file: SaveFileDialog dlg = new SaveFileDialog(); dlgDefaultExt = "txt"; dlgFilter = "Text Files (*txt)|*txt|All files (**)|**";
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// NOTE: Not allowed unless we have FileIOPermission //dlgAddExtension = true; //dlgFileName = "somefiletxt"; if( dlgShowDialog() == DialogResultOK ) { // NOTE: Not allowed to call dlgFileName using( Stream stream = dlgOpenFile() ) using( StreamWriter writer = new StreamWriter(stream) ) { writerWrite(""); } } Notice that instead of opening a stream using the SaveFileDialog FileName property after the user has chosen a file, we call the OpenFile method directly This gives partially trusted code the ability to read from a file, but only with user intervention and providing the code no knowledge of the file system
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