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If the user clicks yes when asked to confirm the transaction, the server first verifies the signature. The signature is verified by computing signature_check. The algorithm concatenates all the relevant pieces of state information into state. Then, it computes the MAC over the state using the server s key. If signature_check matches the signature provided in the HTTP request, then the request has not been tampered with, and the algorithm proceeds with credit card authorization. If the signature_check does not match the signature provided in the HTTP request, then the client may have tried to alter one or more of the parameters. Even though the parameters are sent to the client in the clear, the server will be able to reliably detect if the client sent back different or altered parameters. By using this signature-based approach, the server does not need to keep track of sessionids. It can continue to be stateless at the expense of having to compute MACs when processing HTTP requests and having to stream state information to and from the client. At the same time, for state-intensive applications, the amount of extra bandwidth required to stream state may be more costly than the server-side storage required for user data in a session-id based solution.

Figure 3-1. The widgets dropped onto the dialog form Select the group box and apply a horizontal layout; then select the dialog form itself and apply a vertical layout. Your dialog should now look similar to Figure 3-2.

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CGI scripts can be slow because the whole Python interpreter as well as the modules the script uses need to be loaded into memory on each request Designers will find it difficult to change the theme of the site because the HTML-generating code is interspersed with Python code There are also some more subtle problems with creating a whole application as a series of scripts: Code is frequently duplicated in multiple scripts so over time the code can become difficult to maintain as developers change the database or the code in certain files but aren t aware that other scripts also rely on the way the database or code used to work It can be difficult to understand how the whole application is structured because each script can behave fairly autonomously URLs in the form /cgi-bin/path/to/script.

Figure 3-2. The layouts have been applied. Figure 3-3 shows the Object Inspector for the dialog. The information that all widgets that contain other widgets also have a layout is not visible.

cgi controller=page&action=view&id=3 do not readily reflect the structure of your web application and are not as natural to a user as a URL such as /page/view/3..

SIGN IT ALL!

To address these problems, Pylons (as well as other popular frameworks such as Django, TurboGears, and Ruby on Rails) use two main techniques: A Model View Controller (MVC) architecture Convention over configuration Pylons also puts particular emphasis on loose coupling and clean separation. You ll learn about each of these ideas in the following sections.

Figure 3-3. The Object Inspector, showing the widgets in the dialog Just to test the concept of the layout, try entering Supercalifragilisticexpialidocious as the label text (bring up the context menu by using the right mouse button and pick Change text from the menu). As shown in Figure 3-4, the label expands, and the line editor shrinks.

The Model View Controller architecture is a result of the recognition that, at their heart, most web applications:

One caveat to using a signature-based approach is that the entire transaction state must be signed not just part of it (such as the price). Otherwise, an attacker can conduct (part of) a legitimate transaction to coerce the server into generating a signature for her, and she can then conduct an illegitimate transaction by pasting in parameters of her choice that are not included in the signature. For instance, if only the price is signed, the attacker can go through the order process having selected a cheap item to obtain a signature on the price, and then submit that signature and price in an HTTP request to purchase a more expensive item.

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