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For example, in SelectCatalog.jspx, the request parameter id specifies a book category, and you need to know the category name. This operation requires a database search, which you can implement with the following custom tag: <eshop:categoryName var="cat" catID="${param.id}"/> This accepts the ID as an input and sets the variable cat to the category name. The doEndTag method of CategoryNameTag.java is simple: public int doEndTag() { ServletContext context = pageContext.getServletContext(); DataManager dataManager =(DataManager)context.getAttribute("dataManager"); pageContext.setAttribute(var, dataManager.getCategoryName(catID)); return EVAL_PAGE; } The getCategoryName method of the data manager (invoked exclusively by the doEndTag method of CategoryNameTag.java) is even simpler: public String getCategoryName(String categoryID) { Category category = CategoryPeer.getCategoryById(this, categoryID); return (category == null) null : category.getName(); } Instead of defining the custom tag, you could add the categoryID property to the data manager: private String categoryID = "0"; public void setCategoryID(String categoryID) { this.categoryID = categoryID; } and remove its input parameter from the getCategoryName method. Then, in SelectCatalog.jspx, you could replace the eshop:categoryName element with jsp:setProperty to set the categoryID and c:setVar to invoke the getCategoryName method: <jsp:setProperty name="dataManager" property="categoryID" value="${param.id}"/> <c:set var="cat" value="${dataManager.categoryName}"/> The result would be the same. We didn t do this because it makes the code less transparent, but it is ultimately a matter of taste. We just want to make the point that you can replace the input parameters of bean methods by setting bean properties with jsp:setProperty. Then, you only need to name the methods like getters (e.g., getWhatever), and you ll be able to execute them with an expression such as ${myBean.whatever}. In any case, we decided to implement nontrivial functionality in a custom tag library. In total, we introduced ten tags, as shown in Table 8-2.

Figure 2 8. The rendering process after form submission Now, to implement these ideas, modify getsymbol.xhtml as shown in Listing 2 2. Listing 2 2. getsymbol.xhtml

$deleteID = mysql_real_escape_string( $_POST['deleteID'] ); $query = "UPDATE sample SET deleted = '1' WHERE id = '$deleteID'"; $result = mysql_query( $query ); // ... > Depending on the number of records being added and deleted from a table, you may need after a certain period of time to provide for automated garbage collection (which we will discuss later in this chapter), or to move deleted records in bulk to an archive table.

bookDetails insertOrder searchResults categoryName booksInCategory addBook updateBook deleteBook booksInCart roundToCent

< xml version="1.0" encoding="UTF-8" > <!DOCTYPE ...> <html ...> ... <body> <h:form> <h:inputText value="#{b1.sym}"></h:inputText> <h:commandButton></h:commandButton> </h:form> </body> </html>

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Using this deleted-flag method allows you to revoke the DELETE privilege from your application s database user. This doesn t afford that much protection in the event that an attacker succeeds in logging in to the database as if he were the application user, as he could still do a lot of damage with UPDATE. But revoking the privilege is easy, and it makes destruction just a little bit harder for an attacker who finds an SQL injection attack in some part of your application or discovers the application s database password on disk. Setting up a nonprivileged database account, to be used by your application for connecting to its database in PHP, is a straightforward process that we ll discuss in more detail in 13. Here s the basic outline: 1. Start with a clean slate by revoking all privileges from the target user, with an SQL command that looks something like this:

var, bookID var, customer var, keyword var, catID var, catID bookID bookID, quantity bookID items var, value

... <h:dataTable value="#{catalog.products}" var="p" border="1"> ... </h:dataTable> <h:form> <h:commandLink action="login" value="Login"/> <h:commandLink value="Logout"> <f:actionListener type="shop.LogoutActionListener"/> </h:commandLink> </h:form> </body>

REVOKE ALL ON appdb.* FROM 'appuser'@'localhost'; 2. Then grant the bare minimum of privileges, with an SQL command something like this:

BookDetails.jspx OrderConfirmation.jspx SearchOutcome.jspx SelectCatalog.jspx SelectCatalog.jspx ShoppingCart.jspx ShoppingCart.jspx ShoppingCart.jspx ShoppingCart.jspx ShoppingCart.jspx

GRANT SELECT, INSERT, UPDATE, LOCK TABLES ON appdb.* TO 'appuser'@'localhost' IDENTIFIED BY 'password'; If even more restrictive levels of access are appropriate for some tables, you can issue any number of additional REVOKE statements: REVOKE UPDATE ON appdb.types, appdb.zipcodes FROM 'appuser'@'localhost';

Create the LogoutActionListener class in the shop package, as shown in Figure 4-30.

Listing 8-10 shows an example of a TLD tag entry. Listing 8-10. A TLD Tag Definition <tag> <description>Insert an order into storage</description> <display-name>insertOrder</display-name> <name>insertOrder</name> <tag-class>eshop.tags.InsertOrderTag</tag-class> <body-content>empty</body-content> <attribute> <name>var</name> <type>java.lang.String</type> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>customer</name> <type>eshop.beans.Customer</type> <rtexprvalue>true</rtexprvalue> </attribute> </tag>

One drawback to this technique is that it requires adding a condition to every SELECT query that might return already-deleted rows in a result set. To select records from those tables, therefore, you would need to check the deleted flag by specifying deleted = '0' in the WHERE clause, thus retrieving only records that are not marked as having been deleted. You might be tempted to do this by going through your application by hand and ensuring that deleted = '0' is one of the conditions in every SELECT query. So a query like this: SELECT * FROM movies WHERE stars = '5'; would have to become SELECT * FROM movies WHERE stars = '5' AND deleted = '0';

Although we used Eshopx as a basis for the JSF version of our application example, its architecture is quite different from that of the previous two versions. This is partly due to the fact that we had to replace ShopServlet with the standard FacesServlet class. In the process, we also removed the custom tags we had introduced in Eshopx. In this section, we ll refer to the Eshopf application as described in 5 after the addition of a custom converter, a custom validator, and a custom component with a separate renderer.

package shop; import import import import import import javax.faces.context.ExternalContext; javax.faces.context.FacesContext; javax.faces.event.AbortProcessingException; javax.faces.event.ActionEvent; javax.faces.event.ActionListener; javax.servlet.http.HttpSession;

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