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Figure 4-31. Catalog Price rules are designed to modify products and offer discounts to customers. Rules are not retroactive, meaning if customer A purchases a product before the catalog price rule is applied, the rule will not update the previous order. When establishing a catalog price rule it is important to know that if the today s date falls within the from date and the to date, the rules are instantaneous so once you ve applied a catalog price rule it will immediately affect any products the rules apply to.

Web applications are vulnerable to many exploits, and no framework can make up for a sloppy developer building an application that is easy to hack. In this section, we will review some of the most common exploits and show you how to use Rails to protect your application against them.

Caution When opening a standard library file in a text editor like this, you run the risk of accidentally

Figure 3-16. Step 3 of the onepage checkout process. Customers must enter in their shipping information.

If you let your users provide content on the site, you must consider that someone may try to enter some malicious content, often in form of JavaScript. Therefore, you should never output anything generated by users directly in the browser. Rails has a shortcut method h (alias for html_escape), which escapes all the output run through it: <%= h @user.first_name %> For example, if first_name is >George<, the output of h will be >George<. That way, a user cannot enter HTML tags or JavaScript and get it parsed by the browser. If you want to allow the user to store some safe HTML, you can also run the output through the sanitize helper, which strips all form tags, script tags, and onXXX (such as onclick) attributes from tags to prevent running arbitrary JavaScript on the page.

modifying it. Doing so might break it, so when you close the file, make sure that you don t save any changes you might have made.

In this step, customers must choose their shipping method to continue the checkout process. Magento provides complete control over the shipping options. Administrators can not only control which shipping auctions are available, but exactly how much shipping should cost. Magento also has UPS and FedEx shipping calculators built in. This allows for real-time shipping quotes by both the UPS and FedEx online shipping calculators. Customers can also enter in a gift message if their purchase is a gift (see Figure 3-17).

It s easy for people to build their own form by copying, for example, your registration form, and adding some fields to it, like this: <input type="hidden" name="user[accepted]" value="1" /> <input type="hidden" name="user[admin]" value="1" /> Now suppose the malicious user submits this form to your standard registration action, which has something like this in it: @user = User.create(params[:user]) This way, he might end up being an admin user. It is fairly easy to protect against this type of manipulation in Rails. Just define sensitive attributes as protected: class User < Activerecord::Base attr_protected :accepted, :admin end

Note that some modules don t have any Python source you can read. They may be built into the interpreter (such as the sys module) or they may be written in the C programming language. (The C source code is also available, but that s beyond the scope of this book. See 17 for more information on extending Python using C.)

Figure 3-17. Step 4 of the onepage checkout process. Customers must enter in their shipping information.