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Before we discuss prevention of script injection in specific HTML contexts, let s make some general observations.

Those three types of firefighter basically differ in the strategy that they use for putting out fires. There s a base class that provides a default implementation, and a couple of classes that override the virtual methods to do things differently. Let s say we wanted to support lots of different types of firefighter, all of whom were expected to have a different approach to fighting fire, from the trainee, to the chief, to Gulliver (who has his own idiosyncratic way of putting out a fire in Lilliput). We still want the handy Name property and the Drive method, and we still want anyone to be able to call an ExtinguishFire method.

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Noticing that our FireChief, for example, doesn t make use of the base implementation at all; we don t want to provide a standard for that method. We ll just let all implementers decide for themselves how it is going to work. We re shooting for something that looks like Figure 4-2.

Returning to VWD, go to the Solution Explorer. The block test harness works with files that are located in the Blocks directory. If you want to test your new block creation, you have to put it in here. Select or expand the Blocks directory in the Solution Explorer window. You should see three files in the Blocks folder: We are interested in is the Twitter.js file (at the time of this writing in October 2007, the other two files are not complete and are not useful, so I won t cover them here). The .js file extension is recognized by Visual Web Developer as a JavaScript file remember, block code is JavaScript. Also, if you recall, when we ran the test harness, we were typing JavaScript and referencing an object called TwitterClass. Twitter is a social networking and microblogging service utilizing instant messaging, SMS, or a web interface. Therefore, the code in Twitter.js is JavaScript code that accesses a Twitter repository and prints out the results. Let s go look at the code by double-clicking the Twitter.js file in Solution Explorer (see Figure 8-21).

C# methods can have named places to hold information. These are called variables, because the information they contain may be different each time the program runs, or your code may change a variable while the program runs. Example 2-5 defines three variables in our program s Main method, to represent the distance traveled by the car, how long it has been moving, and how much fuel it has consumed so far. These variables don t vary at all in this example a variable s value can change, but it s OK to create variables whose value is fixed.

static void Main(string[] args) { double kmTravelled = 5.14; double elapsedSeconds = 78.74; double fuelKilosConsumed = 2.7; }

Notice that the variable names (kmTravelled, elapsedSeconds, and fuelKilosConsumed) are reasonably descriptive. In algebra it s common to use single letters as variable names, but in code it is a good practice to use names that make it clear what the variable holds.

It is sometimes suggested that XSS is an issue that occurs due to lack of proper input validation Strictly speaking, this is not so, and relying on input validation alone can result in incomplete solutions There are a number of reasons that support this observation: It is often not possible to restrict input strings to a set of characters that are safe to output in all HTML contexts For example, we may have to allow angle-bracket and double-quote characters for an input field representing an e-mail address to allow addresses of the form "Alice User" <alice@learnsecuritycom> Input validation is usually applied at the outer boundaries of the overall system for example, to query parameters received with HTTP requests, or data retrieved from a back-end data feed However, back-end applications and databases are usually considered inside the input validation boundary.

If you can t think of a good descriptive name for a variable, that s often a symptom of trouble. It s hard to write code that works if it s not clear what information the code is working with.

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