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The processing of the HTTP headers cross-references the authorization information with some local information. The local information represents the user identity as defined by the server and could be stored in a database, a Lightweight Directory Access Protocol (LDAP) server, or some other repository. In the example, the variable identifier represents the local information, but the local information does not need to be a single variable, and it could be a structure, class, or some other hierarchy. The form of the local information really depends on the server implementation and nature of the web application. What this results in is a modified version of IUserIdentification, and the factory Create methods. If your local application has a class to represent the local information, the Create method with a parameter would be modified to pass in a class instead of a simple string buffer. If the local information consisted of two classes, the Create method and IUserIdentification definition would consist of those two classes. The examples proposed are only rules of thumb, but two Create factory methods are needed to indicate an identified user and an unidentified user. The last step is to wire everything together in the global.asax file. As in the Accept HTTP header example, the user identification code is placed in the BeginRequest handler, which is the first phase called when handling a request. Before the code is shown, let s ask ourselves whether that is the best place to put the user identification code. Regardless of platform, there are various phases, and one of them is before an authentication phase. As it stands right now, the wiring is happening before the server performs the authentication, which might mean that the authentication by the server is not complete. This in turn might mean that if certain authentication properties and methods are used, they will not be complete. Hence, a better place to wire the user identification routines when using HTTP authentication is after the authenticaE B V N tion phase. For ASP.NET, that is the OnAcquireRequestState phase. Following is the implementation of the method Application_OnAcquireRequestState: void Application_OnAcquireRequestState(Object sender, EventArgs e) { HttpApplication app = (HttpApplication)sender; IUserIdentificationResolver<HttpApplication> resolver = new HttpAuthenticationResolver(new UserIdentificationFactory()); IUserIdentification user = resolver.Resolve(app); app.Context.Items["identifier"] = user; } In the implementation of Application_OnAcquireRequestState, the object instance sender is typecast to an instance of HttpApplication. The resolver variable references an instance of the HttpAuthenticationResolver type. The implementation of the factory UserIdentificationFactory has not been shown, but is an implementation of the Factory pattern and instantiates the UserIdentification type. Then the method Resolve is called, and an instance of IUserIdentification is returned. These steps can be performed on any platform because they are generic. What is specific to ASP.NET and will be on other platforms is how to hand the user identification information (IUserIdentification instance) to the handler. In the case of ASP.NET, the user identification is assigned to the Context.Items property. On other platforms, it will be some other property that is common to all handlers and filters throughout the life cycle of the HTTP request and response. As it stands, the server has been wired, and the individual handler needs to reference the user identification whenever content should be accessed or not. To make the HTTP authentication application work, the client has to provide the username and password. Figure 5-11 showed how to send a username and password via the browser, but the following example illustrates how to do the same thing via the XMLHttpRequest object:
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var xmlhttp = FactoryXMLHttpRequest(); "GET", "/url", true, username, password"); The only change is the addition of the fourth and fifth parameters of the open method. The fourth parameter represents the username, and the fifth parameter is the password. When given those parameters, XMLHttpRequest will use the username and password when XMLHttpRequest is challenged. If there are no authentication challenges, the username and password are ignored. Therefore, when using HTTP authentication and the XMLHttpRequest object, you could always pass the username and password to XMLHttpRequest and let XMLHttpRequest handle the details. Authenticating When It Is Not Necessary One of the side effects of HTTP authentication is that content usually is either protected or not protected. Traditionally and this is why cookies are used HTTP authentication cannot be off for a resource and then on again for the same resource. That would confuse users because, as it stands right now, HTTP authentication is a global setting and not an individual setting. In other words, if authentication is required for one, then it is required for all. That poses a problem in that if a user wants to browse a site and is purchasing something, that user will need a shopping cart. But to implement a shopping cart, a user identifier is needed. To create a shopping cart, unprotected resources need to be protected. But the protection is global and hence it would mean everybody would need to get a shopping cart after browsing the first page of a shopping site and start buying something. Nice idea to jump-start an economy, but it is not going to happen. To get around this issue of sometimes protection, you can use an HTTP authenticaE B V N tion technique. The technique is as follows: 1. Let the user browse the site as usual (for example, 2. On each browsed page, add a protected link to indicate that the user wants to be authenticated ( 3. When the user clicks on the authentication link after the authorization, the HTTP realms (domains) that include the nonprotected content are assigned in the response ( 4. Then when the user browses the URL, user identification information is sent even though it is not required. This trick works extremely well if you use HTTP digest authentication. Following is an example Apache HTTPD configuration that uses this technique: <Directory "/var/www/browse/authenticate"> AllowOverride AuthConfig AuthType Digest AuthDigestDomain /browse /browse/authenticate AuthDigestFile "/etc/apache2/digestpasswd" AuthName "Private Domain" Require valid-user </Directory>
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