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CHAPTER 5 PERMUTATIONS PATTERN
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is where the association of user identification to cookie occurs. For the example using ASP.NET, the protected URL would be authentication.aspx, and the implementation of authentication. aspx would be as follows: <%@ Page Language="C#" %> <%@ Import Namespace="Component.Authentication" %> <script runat="server"> public void Page_Init( Object source, EventArgs ev) { IUserIdentificationResolver< HttpRequest> resolver = new HttpAuthenticationToCookieResolver( new UserIdentificationFactory()); IUserIdentification user = resolver.Resolve(Page.Request); if (!user.IsIdentified) { Page.Response.StatusCode = 500; Page.Response.StatusDescription = "No authorization information"; Page.Response.SuppressContent = false; Page.Response.End(); } else { Session["useridentifier"] = user; } } </script> <html> <head runat="server"> <title>Protected</title> </head> <body> Success! </body> </html> In the ASP.NET page, the function Page_Init implements the initialization phase of the page loading. The init phase is called before the page is processed, and is ideal to test whether the user is authorized. In the implementation, the first two lines, which instantiate the HttpAuthenticationToCookieResolver type and call the method Resolve, are identical to the user identification examples using HTTP authentication. What is different from the HTTP authentication examples is that the instantiated IUserIdentification instance is tested to see whether the user is identified. If the user is not identified (!user.IsIdentified), an HTTP 500 error is generated with the message that there is no authorization information. It might be tempting to return an HTTP 401 error to indicate an unauthorized access to the document, but that would be incorrect. It would be incorrect because authentication.aspx is not responsible for implementing HTTP authentication. That is the job of the administrator. If an HTTP 500 error has been generated, what has happened is that the administrator did not protect the URL. If authorization information is associated with the request, the user variable will reference an authenticated user instance that could be assigned to the Session variable. In ASP.NET,
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CHAPTER 5 PERMUTATIONS PATTERN
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the Session variable is the session information associated with the cookie sent by ASP.NET. Then whenever any handler is called, the Session will contain a reference to the identified user. The user does not have to be authenticated using HTTP authentication. An HTML form could be used instead. Using the HTML form, the developer is responsible for providing code that manages a user. Because of this added code, the HTTP authentication mechanism is preferred because it is the basis of the HTTP protocol.
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Implementing the Shopping Cart
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Now that you can authenticate a user, you can associate a shopping cart with a user. When creating a shopping cart, do not consider the shopping cart to be available at one URL. There will be many users of a site, and they will each need their own shopping cart. This means each user gets an individual shopping cart at a unique URL. This is a chicken-and-egg scenario, because if there is an individual URL for a shopping cart, how does the user get that individual URL if they do not know it in the first place Comparing it to the mall example, it is like saying, Yeah, we have shopping carts, but they are somewhere in this mall. Logically all malls put their shopping carts in easy-to-reach locations. This is what has to happen online. The result is the creation of a URL that acts as a directory listing. If the URL http://mydomain.com/shoppingcart were the easy-to-reach location, calling it would result in the following being generated: <dir xmlns:xlink="http://www.w3.org/1999/xlink"> <cart EBVN xlink:href="example12345" xlink:label="unlabelled" xlink:title="Unlabelled Shopping Cart" /> </dir> The generated result is an XML file that contains a number of contained links defined by using the XML XLink notation. Each generated link represents an available cart. Because each client requires a cart, the generated result does not need to contain all available shopping carts. The generated result needs to contain only one unique available cart. When referencing the shopping cart, the client needs to remember only the links generated in the result. If the client is operating in anonymous mode, has not been authenticated, and has turned off cookies, the client JavaScript only needs to remember the provided shopping cart link. If the client is authenticated or has allowed cookies, the projected shopping cart links can be associated with the cookie. Another solution that allows complete anonymity and could be used very effectively is not to save the state on the server side, but on the client side. So whenever the client decides to purchase something, the shopping cart on the client is filled. To check out the items in the cart, the client references a URL and passes the cart to the server. The cart state would be volatile, but it would be a true shopping cart in that no authentication is necessary until the user is ready to check out. If the shopping cart is based on the generated link, the cart is server side. The shopping cart could be kept for a long time, and implementing the Permutations pattern would allow users to switch devices, browsers, or locations to view their shopping carts. To make the shopping cart work properly, you need to define the Accept and Authorization headers, as illustrated by the following HTTP request:
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