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MACs can be used to determine if a message originated from a principal that has possession of a secret key. In particular, Alice and Bob may share a key, k, and Alice may use that key to compute a MAC on a message, M, which we denote as t = MAC(M,k). Alice can then transmit M and t to Bob. The value t is often referred to as a tag. Let M' be the message that Bob receives and t' be the corresponding MAC that he receives. If Mallory attempts to modify either M or t, Bob can detect any potential tampering by checking whether t' = MAC(M',k). If the equality holds true, it means (with overwhelmingly high probability) that either the message and signature were not tampered with (M' = M and t' = t) or that Mallory knows k.

}

// Then perform the action foreach (ActionCheckPair process in processes) { process.Action(doc); if (LogTextProvider != null) { Console.WriteLine(LogTextProvider(doc)); } }

Notice that we re checking that our property is not null, and then we use standard delegate syntax to call the function that it references. Let s set a callback in our client (see Example 5-18).

The Blog Information category contains the following operations: bloginfo: Links the count, rank, and available feed information about a specific blog URL blogposttags: Provides the top tags used by a specific blog

static void Main(string[] args) { // ... DocumentProcessor processor = Configure(); processor.LogTextProvider = (doc => "Some text for the log..."); } // ...

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Here we used a lambda expression to provide a delegate that takes a Document parameter called doc, and returns a string. In this case, it is just a constant string. Later, we ll do some work to emit a more useful message. Take a moment to notice again how compact the lambda syntax is, and how the compiler infers all those parameter types for us. Remember how much code we had to write to do this sort of thing back in the world of abstract base classes Compile and run, and we see the following output:

output sanitization step from resulting in an exploitable XSS vulnerability (and will of course also reduce the risk of other classes of vulnerabilities that can be exploited based on untrusted input).

Processing document 1 The processing will not succeed. Some text for the log... Processing document 2 Document traduit. Some text for the log... Spellchecked document. Some text for the log...

That s an example of a delegate for a function that returns something other than void or a bool. As you might have already guessed, the .NET Framework provides us with a generic type so that we don t have to declare those delegates by hand, either.

The .NET Framework exposes a generic class called Func<T, TResult>, which you can read as Func-of T and TResult. As with Predicate<T> and Action<T> the first type parameter determines the type of the first parameter of the function referenced by the delegate. Unlike Predicate<T> or Action<T> we also get to specify the type of the return value, using the last type parameter: TResult.

Just like Action<T>, there is a whole family of Func<> types which take one, two, three, and more parameters. Before .NET 4, Func<> went up to four parameters, but now goes all the way up to 16.

So we could replace our custom delegate type with a Func<>. We can delete the delegate declaration:

In many of the contexts covered in the following sections, XSS is prevented by escaping certain metacharacters such that strings are treated as uninterpreted literals, rather than HTML markup. In HTML, escaping is accomplished by replacing characters with their corresponding HTML character reference (see the HTML 4.01 Specification, Section 5.3, for more information). Character references can be numeric in the form &#D; where D is the decimal character number, or &#xH; where H is the character number in hexadecimal notation. For example, the character reference A represents the letter A. Alternatively, so-called entity references are available, which refer to the character with a mnemonic name. For example, the entity reference < refers to the less-than symbol, <. We assume in the following discussion that an HTML escape function is available that escapes at least the characters listed in Table 10-1 into their corresponding HTML character references. Table 10-1. Minimum Set of Characters to Be Escaped by HTML Escape Function

delegate string LogTextProvider(Document doc);

and update the property:

public Func<Document,string> LogTextProvider { get; set; }

The Member Information category contains the following operations: getinfo: Provides Technorati member information like full name of an author and other blogs by the same author There is certainly a lot to choose from, but you have to keep in mind how it might be used as a block. You can certainly choose to expose all of the APIs of a given service, in this case, all eight operations. To stay more focused on creating blocks, we are going to use one operation search. After I walk you through exposing this operation in the block, you can go back and add the remaining operations if you like. This approach is generally good when you are developing new blocks: it takes you through the entire process and then allows you to build incrementally. So let s read a little more about the Technorati search operation.

We can build and run without any changes to our client code because the new property declaration still expects a delegate for a function with the same signature. And we still get a bit of log text:

& < > " '

Processing document 1 The processing will not succeed. Some text for the log... Processing document 2 Document traduit. Some text for the log... Spellchecked document. Some text for the log... Repaginated document.

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