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For standard HTTP requests, any data included with the request is available from the php://input stream (see http://php.net/wrappers.php for more information). Unfortunately, when requests are sent using multipart/form-data encoding, as when files are uploaded, PHP intercepts and processes the data using a different method, and so the data isn t available on the php://input stream. Should you need to log posted data in this case, your only recourse is to serialize the $_POST array to get variables (see http://php.net/serialize for more information), and append the contents and metadata (name, size, and content type) of each posted file from the $_FILES array. There are many available logging solutions out there in the PHP community, but it is fairly easy to devise a suitable one for your application using either PHP s error_log() function (be sure to use message type 3 to send messages to your own log files and not PHP s) or using the file_puts() function.

and the BookPeer method getBookById gets the corresponding book record from the database. To buy the book, the user then clicks on a link that looks like this in HTML: <a class="link1" href="/eshop/shop action=addItem&bookId=4">Add To Cart</a> With the action parameter set to addItem, ShopServlet forwards the request to ShoppingCart.jsp.

Figure 2 2. Locate this configuration file. Open the file, and modify it as shown in Listing 2 1. Eclipse forgot to update the project name there, so you need to do it yourself. Listing 2 1. Update the Content with the New Project Name

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Because it is important for an application to succeed in appending the relevant information to its log file at the end of each request, you should consider using a shutdown function to make sure that the information is successfully committed to the log file (see http://php.net/register_shutdown_function for more information). In this way, session information will be captured even if the application exits before the natural end of the controlling script. Putting log writing into a shutdown function also puts it neatly at the end of script execution, after output has been sent to the browser. The user should not have to wait to see his output until your application has acquired a lock on the log file and appended the record.

The application displays the shopping cart not only when the user clicks on the Add to Cart link while viewing the book details, but also when the user clicks on the shopping cart link in the header of any page The difference is that in the first case, the action parameter passed to ShoppingCartjsp has the value addItem, while in the second case the value is showCart The shopping cart itself is an object of type Hashtable stored in a session attribute The hashtable key is the book ID, while the value is an object of type CartItem The CartItem class has no methods except the getters and setters for the author, title, price, bookID, and quantity properties.

< xml version="1.0" encoding="UTF-8" > <project-modules id="moduleCoreId" project-version="1.5.0"> <wb-module deploy-name="Stock"> <wb-resource deploy-path="/" source-path="/WebContent"/> <wb-resource deploy-path="/WEB-INF/classes" source-path="/src"/> <property name="context-root" value="Stock"/> <property name="java-output-path"/> </wb-module> </project-modules>

It s appropriate to save the book price in the shopping cart, because the user should pay the price he sees in the book details when he clicks on Add to Cart, even if the book price stored in the database is then changed before he can complete his order For each shopping cart item, ShoppingCartjsp displays the quantity of books in an input field and adds the Update and Delete buttons enclosed in separate forms This makes it possible for the user to modify the number of copies he wants to order or remove an item altogether.

Summary

Here s an example of an update form: <form> <input type="hidden" name="action" value="updateItem"/> <input type="hidden" name="bookId" value="4"/> <input type="text" size="2" name="quantity" value="1"/> <input type="submit" value="Update"/> </form> and here s an example of a delete form: <form> <input type="hidden" name="action" value="deleteItem"/> <input type="hidden" name="bookId" value="4"/> <input type="submit" value="Delete"/> </form> When the user clicks on one of the buttons, ShopServlet forwards the request back to ShoppingCartjsp Before displaying the content of the cart, ShoppingCartjsp needs to do some work that depends on the value of the action parameter (see Table 8-1)..

In this chapter, we have looked at ways to provide authentication systems, access control systems, and logging systems to make sure your applications are being used by the right users in the right way. In the next chapter, we will continue our analysis of secure operations, by discussing ways that you can effectively prevent the loss of data from your databases.

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