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your Action classes as you would if you had checked the host address specifically. Anyone trying to log on to this page from a machine that is not the local host will receive the access denied message. Of course, you still have to add an explicit call to super.execute() within your derived Action class, so if you wanted to secure the home page, your code for the HomePageSetupAction. execute() method would look like this: public class HomePageSetupAction extends LocalAction { public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { super.execute(mapping, form, request, response); IStoryManager storyManagerBD = StoryManagerBD.getStoryManagerBD(); Collection topStories = storyManagerBD.findTopStory(); request.setAttribute("topStories", topStories); return (mapping.findForward("homepage.success")); } } The class is derived from LocalAction, and the first call in the execute() method is super.execute(), meaning the security of this page will be checked. As you can see, this isn t the most elegant solution, as there are a lot of things to remember to do to use the security; it is not something that, once it is implemented, just works. Later in the chapter, we will look at a much more elegant solution to this problem using the RequestProcessor class. As you can see from the examples, providing your own base Action class is quite a simple thing to do; however, you will find that for anything more advanced than providing typed access to simple parameters, much more elegant ways exist for achieving the goal. Overall you will find this method of extension useful because it is quick and easy to implement, but in the long term the solutions you build using this method may prove to be just as much hassle as the problems they are intended to solve.

This allows greater flexibility in defining what Apache treats as CGI and allows CGI scripts to be identified individually, by wildcard or regular expression matching, by MIME type, and by extension. It also allows CGI scripts to be triggered when certain types of file content are accessed.

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We will now write our next application that modifies the trade order type for a specified customer. This application accepts the name of the XML file to be processed as the first parameter, and the customer ID for which the trade type is to be modified as the second parameter. The complete program source is given in Listing 2-11. Listing 2-11. Application for Modifying Trade Order (Ch02\src\XMLBeans-Example\src\ XMLBeansExample2.java) /** * This example uses Schema-Compiler generated classes to * update the specified customer's order from buy to sell * specified Orders.xml document. */ package apress.apacheXML.ch02; import import import import import org.apache.xmlbeans.*; com.apress.apacheXML.*; com.apress.apacheXML.OrdersDocument.*; com.apress.apacheXML.OrdersDocument.Orders.*; com.apress.apacheXML.OrdersDocument.Orders.Customer.*;

6

If you only want to allow CGI scripts in one systemwide directory, you can enable those using ScriptAlias. One good use for this is to improve the security of Web sites that allow users to upload their own Web pages. By placing the aliased directory outside the document root of the server, you can allow users to run the CGI scripts you supply but not interfere with them or add their own. This works because they don t have access to the CGI directory, and Apache will not recognize scripts in the document root as CGI scripts. The standard Apache configuration comes with a ScriptAlias directive to specify a directory where CGI scripts can be kept. The default (for a Unix server) is as follows:

ScriptAlias /cgi-bin/ "/usr/local/apache/cgi-bin/"

Although from the outside it would appear that the ActionServlet class is the controller in Struts MVC arsenal, in actual fact it is the RequestProcessor class. Since version 1.1 of Struts, all request processing was moved from the ActionServlet into the RequestProcessor class (or TilesRequestProcessor if using the Tiles framework). This mechanism of decoupling Struts from the actual presentation technology, in this case servlets, is intended to allow Struts to be used in many more areas in the future. For now, however, it makes extending core request processing of the framework extremely easy. Every time you make a request for a Struts action within your application, it is processed by the RequestProcessor. It is important to note that the RequestProcessor will not handle requests for images, HTML, or plain JSP pages unless you have configured the servlet con-

Apache then interprets any incoming request URL as a request to run a CGI script and will attempt to run a script by that name if it s present:

import java.io.File; import java.util.ArrayList; import java.util.Iterator;

The trailing / on both the alias and target directory might appear redundant, but it forces scripts to appear in the directory rather than just extend the name. Without the trailing slashes, you d have this:

ScriptAlias /cgi-bin "/usr/local/apache/cgi-bin"

tainer accordingly. By replacing the default RequestProcessor class with an implementation of your own, you are able to hook into the request process and provide your own behavior. In this section, we are going to provide two separate examples. First, we are going to demonstrate how you can use the RequestProcessor to replace the functionality of a Filter, and second, we are going to revisit the security examples from the Extending Action and ActionForm section and show you how to restrict host access using the RequestProcessor.

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