create a qr code using c# and asp.net Part V in Visual C#.NET

Printer QR Code ISO/IEC18004 in Visual C#.NET Part V

Part V
Drawing QR Code In Visual C#.NET
Using Barcode creator for .NET Control to generate, create Denso QR Bar Code image in Visual Studio .NET applications.
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Recognize QR Code JIS X 0510 In C#
Using Barcode scanner for .NET Control to read, scan read, scan image in VS .NET applications.
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The Client Side Login Presentation
Generate Barcode In C#
Using Barcode drawer for .NET framework Control to generate, create bar code image in .NET applications.
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Barcode Decoder In Visual C#.NET
Using Barcode scanner for VS .NET Control to read, scan read, scan image in .NET framework applications.
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JavaScript Silverlight auth
Paint QR Code In VS .NET
Using Barcode creation for ASP.NET Control to generate, create QR Code image in ASP.NET applications.
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Paint Quick Response Code In Visual Studio .NET
Using Barcode drawer for Visual Studio .NET Control to generate, create QR Code JIS X 0510 image in .NET framework applications.
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User
Quick Response Code Creation In VB.NET
Using Barcode generator for VS .NET Control to generate, create QR Code JIS X 0510 image in VS .NET applications.
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Code 128 Code Set A Encoder In C#.NET
Using Barcode drawer for VS .NET Control to generate, create Code 128 Code Set A image in .NET framework applications.
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JSON cookie
Code39 Creator In C#.NET
Using Barcode creation for .NET framework Control to generate, create Code-39 image in .NET applications.
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Generate QR Code JIS X 0510 In C#.NET
Using Barcode generation for .NET Control to generate, create Denso QR Bar Code image in VS .NET applications.
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.....
Draw PDF 417 In Visual C#.NET
Using Barcode printer for .NET Control to generate, create PDF417 image in Visual Studio .NET applications.
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Leitcode Drawer In C#.NET
Using Barcode generator for Visual Studio .NET Control to generate, create Leitcode image in Visual Studio .NET applications.
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JSON JSON
Encode Code 128B In None
Using Barcode maker for Font Control to generate, create Code 128 Code Set C image in Font applications.
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Painting PDF-417 2d Barcode In Java
Using Barcode creator for Eclipse BIRT Control to generate, create PDF417 image in Eclipse BIRT applications.
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JSON JSON
QR Code Creator In Java
Using Barcode encoder for Java Control to generate, create QR Code image in Java applications.
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Generate PDF417 In Java
Using Barcode printer for Java Control to generate, create PDF 417 image in Java applications.
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auth JSON cookie
USS-128 Printer In Java
Using Barcode encoder for BIRT reports Control to generate, create UCC.EAN - 128 image in Eclipse BIRT applications.
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Generate GTIN - 128 In None
Using Barcode drawer for Office Word Control to generate, create EAN128 image in Word applications.
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auth JSON cookie
PDF417 Creator In Visual Studio .NET
Using Barcode generator for Reporting Service Control to generate, create PDF 417 image in Reporting Service applications.
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ECC200 Printer In None
Using Barcode encoder for Software Control to generate, create DataMatrix image in Software applications.
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JSON/ JSON SOAP
HTTP Facade
FIGURE 20-5 Legitimate users and outsiders around the HTTP fa ade.
In ASP.NET, login pages require that Forms authentication be turned on. Furthermore, anonymous users should be denied access to any resources within the protected area. Here s a sample configuration script you can use:
<location path="ProtectedAreaOfTheSite"> <system.web> <authorization> <deny users=" " /> </authorization> </system.web> </location>
If necessary, login pages can be placed on a different server and work over HTTPS. This solution, however, has no impact on the security of the HTTP fa ade. Outsiders can still try to access the services via the public URL. In this case, though, because the service IIS endpoint is also placed behind an authorization section, they will receive an HTTP 401 error code (unauthorized access). The outsider call will pass only if the outsider can show a valid authentication cookie. But this can happen only if a cookie theft has occurred previously. However, this is all another problem that relates to the security of the Web site rather than to the security of the services in the HTTP fa ade. The only viable alternative to using cookies and ASP.NET Forms authentication is to install client certificates on all client machines.
Trusting the HTTP Fa ade
Should WCF and Web services do something on their own to keep outsiders off the site If you place service endpoints behind a protected area of the site, you re as safe as with any other ASP.NET pages based on Forms authentication. To give you an idea, if you combine
20 Ajax Programming
Forms authentication with HTTPS you have the same security level currently used by online banking applications and payment sites. It s therefore safe for the middle tier to trust the upper HTTP fa ade and accept any calls coming down the way. However, nothing prevents you from implementing an extra check for authorization within the body of service methods. In this case, though, you need to access credentials information from within the service. AJAX-enabled services can carry this information only via the authentication cookie or client certificates. Programmatically, a service gets user credentials via intrinsic objects of the run-time platform. ASP.NET XML Web services live within the ASP.NET runtime and have full access to the ASP.NET intrinsics, including the User object. By default, instead, WCF service calls are processed by the WCF runtime, which lives side by side with ASP.NET, but it s not a part of it. As a result, a WCF service method can t access the HTTP request context and put its hands on the User object. The only possible workaround is running all the WCF services hosted by the site in ASP.NET compatibility mode. You turn compatibility mode on in the configuration file, as shown here:
<system.serviceModel> <serviceHostingEnvironment aspNetCompatibilityEnabled="true" /> ... </system.serviceModel>
In addition, each service is required to express its explicit approval of the model. A service does this by decorating the service class not the service contract with the AspNetCompatibilityRequirements attribute, as shown here:
[AspNetCompatibilityRequirements( RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)] public class TimeService : ITimeService { ... }
Note that, by default, a WCF service has the RequirementsMode property set to NotAllowed. If this value is not changed to either Allowed or Required, you get a run-time exception as you attempt to make a call to the service. Note WCF services have been designed to be independent from binding and transportation.
By turning on ASP.NET compatibility mode, you break this rule because you make the service dependent on IIS as the host and HTTP as the transportation protocol. On the other hand, services in the HTTP fa ade are just Ajax-specific services so, in this regard, enabling ASP.NET compatibility is actually a natural choice.
Part V
The Client Side
JSON Payloads
When you call server-based code you likely need to pass input data and wait to receive some other data back. Clearly, a serialization format is required to transform platform-specific data (for example, a .NET object) into an HTTP network packet. For years, this field has been the reign of XML. To a large extent, this is still the reign of XML, but not when a Web browser is used as the client. Shorthand for JavaScript Object Notation, JSON is the de facto standard format for browsers and Web servers to exchange data over HTTP when a script-led request is made. The main reasons for preferring JSON over XML can be summarized by saying that, overall, JSON is simpler than full-blown XML and gets a free deserialization engine in virtually any browser that supports JavaScript. You can learn more about the syntax and purposes of JSON at http://www.json.org.
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