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CHAPTER 5 PERMUTATIONS PATTERN
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GET /shoppingcart HTTP/1.1 Host: 192.168.1.103:8100 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7.5) Gecko/20041220 K-Meleon/0.9 Accept: application/xml Authorization: Digest username="cgross", realm="Private Domain", nonce="yiLhlmf/AwA=e1bafc57a6151c77e1155729300132415fc8ad0c", uri="/browse/authenticate", algorithm=MD5, response="c9b5662c034344a06103ca745eb5ebba", qop=auth, nc=00000001, cnonce="082c875dcb2ca740" The request is an illustration of doing multiple things at the same time and contains both authorization and representation information. The server would generate a response similar to the following: <dir xmlns:xlink="http://www.w3.org/1999/xlink"> <cart xlink:href="cgross/cart1" xlink:label="cart1" xlink:title="Shopping Cart 1" /> <cart xlink:href="cgross/cart2" xlink:label="cart2" EBVN xlink:title="Shopping Cart 2" /> <cart xlink:href="cgross/cart3" xlink:label="unlabelled" xlink:title="Unlabelled Shopping Cart" /> </dir> The newly generated response contains a directory listing of all shopping carts associated with the individual user cgross. The links cgross/cart1 and cgross/cart2 represent already created and manipulated carts. The link cgross/cart3 is a new cart that could be used to buy other items. The already existing carts could be old shopping experiences or shopping carts that are waiting for checkout. The big idea is that it is possible to have multiple carts that could be manipulated at different times. Or the server could implement repeat purchases based on a past shopping cart, wish lists, and so on. Using server-based carts allows a website to perform automations. The example illustrated the available carts being generated for those who want to manipulate XML. If a browser references the shopping cart URL link, the following HTML content would be generated: <html> <body> <a href="cgross/cart1" label="cart1">Shopping Cart 1</a> <a href="cgross/cart2" label="cart2">Shopping Cart 2</a> <a href="cgross/cart3" label="unlabelled">Shopping Cart 1</a> </body> </html>
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CHAPTER 5 PERMUTATIONS PATTERN
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Notice how the generated content is HTML, but that a directory listing is still generated similar to the generated XML. Shopping carts are personal items that do not need to be associated with a generic link. Shopping carts have unique URLs that can be entirely anonymous or be associated with a user. The shopping cart illustrates how it is unnecessary to have generic URLs yet still be able to offer the same functionality, even if the user has turned off cookies.
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Pattern Highlights
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The purpose of the Permutations pattern is to define a component-type structure for Web applications that can be associated with a user identifier. Web applications can implement an interface-driven architecture, where the resource mimics an interface, and representation mimics an implementation. The added benefit for the developer is the ability to modularize a web application in a consistent structure. The benefit of the pattern is best illustrated by looking at Figure 5-7, where some URLs implement the Permutations pattern, and others do not. The URLs that implement the Permutations pattern are the reference URLs that clients use when accessing their functionality. A reference URL would be a user s bank account, shopping cart, and so on. Those URLs that are part of the implementation are specific and will generally not be bookmarked by the user. The following points are the important highlights of the Permutations pattern:
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There are two aspects of the Permutations pattern: resource separated from representation, and the definition of URLs that reference specific resources. Separating a resource from a representation means providing a generic URL that can be used on multiple devices or browser types. The end user needs to remember only the URL, and the appropriate content will be generated by the server, depending on the HTTP headers of the HTTP request. When implementing the separation of the resource from the representation, URL rewriting is commonly used. For example, the resource URL http://mydomain.com/resource is redirected to a potential representation URL http://mydomain.com/resource/content.html. Redirected resources such as content.html do not need multiple representations. When a resource has an extension such as html, it is implied that the representation is HTML. When defining resource URLs, they will often reference data resources such as users or bank accounts. The resource URLs are noun based, for example, http://mydomain.com/ bankaccount/maryjane. The URL rewriting component then has the additional responsibility of ensuring those who access a noun-based, resource-based URL have the security clearance. Security clearance is determined by the user identifier. User identifiers are not used to generate content, but to allow or disallow access to a resource. Cookies and HTTP authentication mechanisms are the preferred means used to implement user identification.
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