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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.

ahead and press Tab again to accept the default name. At this point, your source should look like this:

Figure 6 28. Not Dean s List Material: A criterion for filtering grades below 65 on exam 4 where 4 represents that exam s field name. Note, without getting too carried away, that you can specify two criteria to be met at the same time. If I had supplemented the expression above in Figure 6 27 with these entries in O9:O10 (Figure 6 28):

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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

namespace Ch4_EventHandlers { public partial class Page : UserControl { public Page() { InitializeComponent();

Figure 6 29. Two advanced filter criteria operating at the same time I d be searching for all students who scored below 65 in both exams 4 and 5. But we re sticking with our initial criterion those students with test averages equal to or greater than 85. Next, we need to mark out a range on the worksheet to which our filtered results will be copied, because we want these results to occupy a place on the worksheet that is independent of the original gradebook data in C9:I20; so in cells K9:L9 we ll enter (Figure 6 29):

Now these variables cannot be mass-assigned with a parameters hash like the one in the preceding example. However, you can still set them individually when needed: @user.accepted = true Another vulnerability raises its ugly head when you let users edit their information; for example, with URLs like http://www.domain.com/posts/edit/28. It won t take long before someone notices that by changing the last part of the URL, she can get access to posts created by other people. You can protect your application from this by always getting to the objects through the logged-in user: # BAD @post = Post.find(params[:id]) # GOOD @post = current_user.posts.find(params[:id]) If someone now tries to access a post that doesn t belong to her, an ActiveRecord::RecordNotFound exception is raised, which you can then rescue and show a Not Found page to the user: rescue ActiveRecord::RecordNotFound return render(:template => "/shared/404", :status => 404) end

this.btnManaged.Click += new RoutedEventHandler(btnManaged_Click); } void btnManaged_Click(object sender, RoutedEventArgs e) { throw new NotImplementedException(); } private void Button_Click(object sender, RoutedEventArgs e) { txtXAMLEventText.Text = "Thank you for clicking!"; } } } 6. Now the only thing left to do is add the code to the event handler. You will

Figure 6 30. Where our results should appear because, as per our introduction to this exercise, these are the names of the only two fields for which we want to see the filtered results and those results will appear directly beneath those two headings when we execute the Advanced Filter. Remember as well that this results area could be designated anywhere on the worksheet. In the interests off tidying up the worksheet, first either delete the Class Averages row or insert some blank rows between it and Ringo s data (we re doing this because we don t want Class Averages treated as another student). Then click anywhere in the data and click Data Advanced in the Sort & Filter button group. You ll see (Figure 6 30):

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