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ur application is already fairly extensive. George can administer all kinds of things in the application, including books, authors, and publishers. However, the application has one major shortcoming: Anyone can browse to the administrative part of the site and wreak havoc by deleting and editing information. In this chapter, we will show you how to implement a basic authentication system for an application with the help of the acts_as_authenticated plugin. We will also take a look at some common security problems in web applications and give you tips on how to use Rails to avoid them.

In this chapter, I ll talk about domain-specific languages (DSLs), and you ll build a very simple DSL using Intellipad As one might guess, the descriptive term domain-specific means using the language to define a model or do something useful in a specific area of activity or knowledge In the context of software development, the term domain normally applies to a business operation, process, or workflow, such as micro-brewing or creating insurance products The term could apply to areas as diverse as risk management, modeling traffic flows, or creating a just-in-time inventory system Most DSLs, however, are not so ambitious and address more narrowly constrained domains.

1. In the pivot table, move Plant to the Report Filter area, and add Age Group to the Row Labels area. The Date field is still in the Values area, showing a count of incidents, and Year is in the Column Labels area. 2. In the Report Type filter drop-down, select Lost Time (see Figure 12-8).

We need to support three basic scenarios in the Emporium s authentication system: Log in: George has just gotten his hands on Henrik M rtensson s Pro Ruby, and absolutely wants to add it to his catalog. However, as he hasn t logged in already, when he tries to access the admin section of the site, he is redirected to a login page. George gives his credentials and is automatically redirected to the add book page, where he tried to go in the first place. Fail log in: While George is busy maintaining his catalog, another guy tries to access the admin pages, too. His name is Dirty Harry and his intentions are too evil to print here. Luckily for George, Harry doesn t know the admin username and password. Harry is redirected to the login page, just as George is. Here, he tries to log in with scott/tiger, so his attempts fail, and he is just shown the login form with an error message each time. Reset password: George has an amazing memory. It s just sometimes a bit short. Thus, occasionally, he forgets his password to the system. Then he just clicks a link to reset his password, and the system sends him the new one by e-mail. After he has received the new password, he can again log in to the system successfully. Once we put together the authentication system, George will sleep a lot more peacefully he won t need to worry about people wreaking havoc on the Emporium site.

We can create a simple authentication framework for our Rails application by using the acts_as_authenticated plugin (http://technoweenie.stikipad.com/plugins/show/ Acts+as+Authenticated), written by Rails core team member Rick Olson. Let s start by installing the plugin in our application. Enter the following command to tell the Rails plugin framework to look for plugins in the given repository: $ script/plugin source http://svn.techno-weenie.net/projects/plugins