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The processing will not succeed. (Document 1) Document traduit. (Document 2) Spellchecked document. (Document 2) Repaginated document. (Document 2) Highlighting 'millennium' (Document 2) Document traduit. (Document 3) Spellchecked document. (Document 3) Repaginated document. (Document 3) (Document 3) Executed 9 processes.

If the attacker is able to cause the variable query to contain, for example <script>evil-script;</script> the resulting HTML snippet would render as <b>Error: Your query '<script>evil-script;</script>' did not return any results.</b> and the attacker s script would execute in the browser, and could, for example, steal the victim user s cookies.

OK, our production team is very happy with all of that, but they have another requirement. Apparently, they have one team working on some diagnostic components that

are going to track the time taken to execute some of their processes, and another team developing some real-time display of all the processes as they run through the system. They want to know when a process is about to be executed and when it has completed so that these teams can execute some of their own code. Our first thought might be to implement a couple of additional callbacks: one called as processing starts, and the other as it ends; but that won t quite meet their needs they have two separate teams who both want, independently, to hook into it. We need a pattern for notifying several clients that something has occurred. The .NET Framework steps up with events.

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An event is raised (or sent) by a publisher (or sender) when something of interest occurs (such as an action taking place, or a property changing). Clients can subscribe to the event by providing a suitable delegate, rather like the callbacks we used previously. The method wrapped by the delegate is called the event handler. The neat thing is that more than one client can subscribe to the event. Here s an example of a couple of events that we can add to the DocumentProcessor to help our production team:

class DocumentProcessor { public event EventHandler Processing; public event EventHandler Processed; } // ...

Any string that is possibly derived from untrusted data and is inserted into an HTML document must be HTML-escaped using the HTML escape function introduced in Section 10.5.1.

Notice that we use the keyword event to indicate that what follows is an event declaration. We then specify the delegate type for the event (EventHandler) and the name of the event (using PascalCasing). So, this is just like a declaration for a public field of type EventHandler, but annotated with the event keyword. What does this EventHandler delegate look like The framework defines it like this:

delegate void EventHandler(object sender, EventArgs e);

Notice that our delegate takes two parameters. The first is a reference to the publisher of the event so that subscribers can tell who raised it. The second is some data associated with the event. The EventArgs class is defined in the framework, and is a placeholder for events that don t need any extra information. We ll see how to customize this later.

Almost all events follow this two-argument pattern. Technically, they re not required to you can use any delegate type for an event. But in practice, this pattern is almost universal.

So, how do we raise an event Well, it really is just like a delegate, so we can use the delegate calling syntax as shown in the OnProcessing and OnProcessed methods in Example 5-21.

These are the mandatory parameters for the search query. key: Use this to specify your Technorati API key. query: Set this to the words you are searching for. Separate words with a plus sign (+) as usual.

The less-than and greater-than characters need to be escaped because they delimit HTML tags. If not escaped, these tags (including <script> tags) would be evaluated by the browser. If the ampersand were not escaped in this context, this would not result in a security issue, but could result in a rendering bug because the browser may interpret the ampersand as the beginning of an entity reference and not display it as intended. It is not strictly necessary to escape the quote characters in this context; however, this is necessary in other contexts, and it is convenient to use the same escaping function everywhere.

public void Process(Document doc) { OnProcessing(EventArgs.Empty); // First time, do the quick check foreach (ActionCheckPair process in processes) { if (process.QuickCheck != null && !process.QuickCheck(doc)) { Console.WriteLine("The process will not succeed."); if (LogTextProvider != null) { Console.WriteLine(LogTextProvider(doc)); } OnProcessed(EventArgs.Empty); return; } } // Then perform the action foreach (ActionCheckPair process in processes) { process.Action(doc); if (LogTextProvider != null) { Console.WriteLine(LogTextProvider(doc)); } } OnProcessed(EventArgs.Empty);

}

private void OnProcessing(EventArgs e) { if (Processing != null) { Processing(this, e); } } private void OnProcessed(EventArgs e) { if (Processed != null) { Processed(this, e); } }

Notice how we pulled out the code to check for null and execute the delegate into functions called OnXXX. This isn t strictly necessary, but it is a very common practice.

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