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In addition, there are a number of challenges in implementing a scheme that ties sessions to IP addresses without adversely affecting usability. There are a number of situations in which a user s session may legitimately result in requests originating from different IP addresses. For example, a user who accesses the Internet using a dial-up connection may be assigned a different IP address every time he connects. Similarly, it is common for laptop users to access the Internet via several different providers (and hence with different IP addresses) in a single day (e.g., from home, at work, or via the wireless network in a coffee shop). For less frequently used applications involving sensitive data or high-value transactions (e.g., online banking applications), it may be appropriate to indeed tie sessions to a single IP address at login time and require the user to re-authenticate whenever his computer s IP address changes. For other applications, this may not be an acceptable user experience. For such applications, a heuristic approach might be more appropriate; the application might reject a request only if there is a very strong indication that it includes a stolen session cookie (e.g., a case in which a session is created based on a login request that originates from an IP address in California, and the corresponding session cookie appears 5 minutes later in a request that originates in Eastern Europe).

Summary

What if we wanted to make this more general-purpose We could modify Test so that instead of working only with int, it works with any built-in numeric type, or indeed any type that offers a version of the < operator that can be used with int. We could do that by changing the argument to dynamic, as Example 18-23 shows.

static bool Test(dynamic x) { return x < 100; }

Unfortunately, this change would cause the code in Example 18-22 to fail with a compiler error. It complains that there are no overloads that match delegate System.Func<int,bool>, which is the function type the Where method expects here. This is frustrating because our Test method is certainly capable of accepting an int and returning a bool, but despite this, we need to add our own wrapper. Example 18-24 does the job.

var filteredNumbers = nums.Where(x => Test(x));

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This is a little weird because it seems like it should mean exactly the same as the equivalent line in Example 18-22. We ve had to add some extra code just to keep the C# type system happy, and normally that s exactly the sort of thing the dynamic style is supposed to let you avoid. Part of the problem here is that we re trying to use LINQ, a thoroughly static-oriented API. But it turns out that there s a deeper problem here, which we can illustrate by trying to write our own dynamic-friendly version of Where. Example 18-25 will accept anything as its test argument. This DynamicWhere method will be happy as long as test can be invoked as a method that returns a bool (or something implicitly convertible to bool).

The previous sections focused on the ability of a (potentially malicious) page to cause content to be loaded into the user s browser. At the same time, we need to consider that the malicious page is in fact causing a request to be made by the user s browser to the web server serving our application; this request may cause our application to initiate actions or state changes. For instance, consider a page at www.hackerhome.org with this HTML fragment: <form name="f" method="POST" action="http://www.mywwwservice.com/action"> <input type="hidden" name="cmd" value="do_something"> ... </form> <script> document.f.submit(); </script>

static IEnumerable<T> DynamicWhere<T>(IEnumerable<T> input, dynamic test) { foreach (T item in input) { if (test(item)) { yield return item; } } }

This compiles, and will behave as intended if you can manage to invoke it, but unfortunately it doesn t help. Example 18-26 tries to use this, and it will not compile.

The C# compiler complains:

Argument 2: cannot convert from 'method group' to 'dynamic'

This HTML fragment defines an HTML form with the given action URL and a hidden input field named cmd. The form has a name attribute, which causes the browser to expose a reference to the form s corresponding DOM object as the DOM property document.f. The included JavaScript invokes the submit() method on the form s DOM object, which instructs the browser to submit the form with an HTTP POST request to the action URL just as if the user had clicked the form s submit button. Thus, when this HTML document is loaded into the user s browser, the form will be submitted to our web application without any user interaction.

The problem is that we ve given it too much latitude. Example 18-25 will work with a wide range of delegate types. It would be happy with Predicate<object>, Predicate<dynamic>, Predicate<int>, Func<object, bool>, Func<dynamic, bool>, or Func<int, bool>. Or you could define a custom delegate type of your own that was equivalent to any of these. The only thing the C# compiler can see is that Dynamic Where expects a dynamic argument, so for all it knows, it could pass any type at all. All it would have to do is pick one that fits the Test method s signature any delegate type with a single argument and a return type of bool would do. But it doesn t have any rule to say which particular delegate type to use by default here. In Example 18-22, the compiler knew what to do because the Where method expected a specific delegate type: Func<int, bool>. Since there was only one possible option, the C# compiler was able to create a delegate of the right kind. But now that it has too much choice, we need to narrow things down again so that it knows what to do. Example 18-27 shows one way to do this, although you could cast to any of the delegate types mentioned earlier.

In this chapter, I have shown you the four ways that Popfly gives to share your mashups with external users: in web pages, Windows Vista gadgets, Windows Live Spaces, and Facebook. You also learned how to e-mail your mashup. In the next chapter, you will begin examining ways to create your own reusable functionality within Popfly by creating your own Popfly blocks.

var filteredNumbers = DynamicWhere(nums, (Predicate<dynamic>) Test);

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