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containing an action token is consistent with the session cookie. Since a malicious page would not be able to guess the correct value for this parameter, it would not be able to make a request that the application responds to and returns any data. In essence, we have complemented session cookie based request authentication (which the browser always supplies automatically) with request authentication based on a request parameter. We note that the term action token is not quite accurate in this case, because the requests in question do not necessarily result in an action or state change on the server. However, since we do need to protect state-changing Ajax requests against XSRF, we may as well use just one single token and validation mechanism. If GET requests are used, the action token is transferred in the URL as a query parameter, which brings up the concerns regarding leakage and logging discussed in Section 10.3.4. We should whenever possible use POST requests for that reason (made, for example, using XmlHttpRequest). However, the risk of leakage is smaller in this case because the returned document is a JavaScript document and not an HTML document that may contain references to third-party resources.

public double SpeedInMilesPerHour { get { return SpeedInKilometersPerHour / 1.609344; } set { SpeedInKilometersPerHour = value * 1.609344; } } public double SpeedInKilometersPerHour { get; set; }

As far as users of the Plane class are concerned, there s no discernible difference between the two approaches the way in which properties work is an encapsulated implementation detail. Example 3-11 shows an updated Main function that uses the new properties. It neither knows nor cares which one is the real one.

static void Main(string[] args) { Plane someBoeing777 = new Plane("BA0049"); someBoeing777.SpeedInMilesPerHour = 150.0; Console.WriteLine( "Your plane has identifier {0}, " + "and is traveling at {1:0.00}mph [{2:0.00}kph]", someBoeing777.Identifier, someBoeing777.SpeedInMilesPerHour, someBoeing777.SpeedInKilometersPerHour); someBoeing777.SpeedInKilometersPerHour = 140.0; Console.WriteLine( "Your plane has identifier {0}, " + "and is traveling at {1:0.00}mph [{2:0.00}kph]", someBoeing777.Identifier, someBoeing777.SpeedInMilesPerHour, someBoeing777.SpeedInKilometersPerHour); } Console.ReadKey();

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Although our public API supports two different units for speed while successfully keeping the implementation for that private, there s something unsatisfactory about that implementation. Our conversion relies on a magic number (1.609344) that appears repeatedly. Repetition impedes readability, and is prone to typos (I know that for a fact. I ve typed it incorrectly once already this morning while preparing the example!) There s an important principle in programming: don t repeat yourself (or dry, as it s sometimes abbreviated). Your code should aim to express any single fact or concept no more than once, because that way, you only need to get it right once. It would be much better to put this conversion factor in one place, give it a name, and refer to it by that instead. We can do that by declaring a field.

Notice how it includes the extra characters we included (the - and the but).

If the request in question is non state changing (i.e., it is a read-only request to our web server), it may seem sufficient to omit the action token and simply restrict the server such that it responds only to POST requests. However, if the request both reads and writes, then using an action token is required to prevent attack. Only the <script> tag provides a mechanism for a document in one domain to be evaluated as script in the context of a document in a second domain. HTML form submissions, inclusion via <iframe>, and the like always result in the returned document to be evaluated in the domain it was loaded from, and XmlHttpRequest does not permit requests to be made across domain boundaries. At the same time, <script> tags always cause the document to be loaded with a GET request. As such, a malicious page cannot make a request and cause the returned document to be evaluated as JavaScript in this page s context, and it is sufficient to rely on restricting the request method to POST for the purposes of protecting read-only requests from XSSI attacks. However, since Ajax requests are usually a mix of read-only and state-changing requests, we highly recommend to protect all Ajax requests via action token. If this is done in a browserside API that wraps the details of making requests to the server, we avoid the introduction of a second code path; the cost of validating the token server side should not be a determining factor.

Were you expecting the output to be 123-456 but 78 The framework applies the placeholder rule for the lefthand side of the decimal point, so it drops the first nonrequired placeholder, not the last one. Remember that this is a numeric conversion, not something like a telephone-number format. The behavior may be easier to understand if you replace each # with 0. In that case, we d get 012-345 but 678. Using # just loses the leading zero.

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