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The entire attribute value must be enclosed in quotes to prevent attribute-injection attacks. First, it is necessary to escape the quote character that is used to delimit the attribute s value to prevent the closing the quote attack. While the HTML specification allows either double or single quotes to be used to enclose attributes, it is advisable to decide on a convention and use one type of quote throughout the application. It is nevertheless advisable to use an HTML escaping function that escapes both types of quotes, in case of deviation from the convention. Second, it is necessary to escape the ampersand character. Older versions of the Netscape browser support so-called JavaScript entities (see Netscape s JavaScript Guide ). This allows a string of the form &{javascript_expression}; to be used within attributes; the expression is evaluated and the entire entity expression is replaced with the result of this evaluation. An attacker who is able to inject ampersand and curly-brace characters into an attribute could be able to execute malicious script. While non-escaped angle brackets in attribute values do not result in XSS vulnerabilities in popular browsers, it is safest to escape them nevertheless. This also ensures that the resulting HTML is well-formed and allows you to use the same HTML-escaping function as elsewhere.

class CalendarEvent { public string Title { get; set; }

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We are using an optional parameter called format that indicates that we would like to receive the results of the search in RSS format. RSS format is not only common on the Internet but in many blocks within Popfly. This choice will give us some flexibility, because more blocks that can interact with our block. The Popfly helper object environment s getXml function is called with built reqUrl variable being passed to it. The results returned are XML in RSS format and are assigned to a variable called resultXML. The remaining code of the block should look very familiar. Most of the code was grabbed directly from the RSS block in 7. This is one of the important principles you need to learn when creating your blocks: reusing code will speed your development, because that code works and has been tested. Nothing is wrong with creating your own code from scratch, but you can save a lot of headaches by leveraging the work of others. The RSS XML is parsed, and an array of RSSItem objects is created and returned as the result of the function. Now, any block that consumes an object of type RSSItem can consume the results of our Technorati block.

}

public DateTimeOffset StartTime { get; set; } public TimeSpan Duration { get; set; }

This class holds the event s title, start time, and duration in a single object. We can create an array of these objects, as shown in Example 7-10.

10.5.4. URL Attributes (href and src)

CalendarEvent[] events = { new CalendarEvent { Title = "Swing Dancing at the South Bank", StartTime = new DateTimeOffset (2009, 7, 11, Duration = TimeSpan.FromHours(4) }, new CalendarEvent { Title = "Saturday Night Swing", StartTime = new DateTimeOffset (2009, 7, 11, Duration = TimeSpan.FromHours(6.5) }, new CalendarEvent { Title = "Formula 1 German Grand Prix", StartTime = new DateTimeOffset (2009, 7, 12, Duration = TimeSpan.FromHours(3) }, new CalendarEvent { Title = "Swing Dance Picnic", StartTime = new DateTimeOffset (2009, 7, 12, Duration = TimeSpan.FromHours(4) }, new CalendarEvent { Title = "Stompin' at the 100 Club", StartTime = new DateTimeOffset (2009, 7, 13, Duration = TimeSpan.FromHours(5) } };

15, 00, 00, TimeSpan.Zero),

19, 30, 00, TimeSpan.Zero),

12, 10, 00, TimeSpan.Zero),

15, 00, 00, TimeSpan.Zero),

Attributes such as href and src take URLs as arguments. Depending on the tag they are associated with, the URL may be interpreted, de-referenced, or loaded at the time the browser interprets the tag (e.g., <img src=...> tags), or loaded only when the user performs an action (e.g., <a href=...> tags). If the value of the URL attribute is computed dynamically and may be influenced by a attacker, the attacker can make the URL refer to a resource that we did not intend. This could result in all kinds of problems (e.g., page spoofing), but may in particular result in injection of malicious script.

19, 45, 00, TimeSpan.Zero),

Now that we have the block code ready, it s time to test the code to make sure it works. To test it, we need to get it working in the SDK s test harness. In 8, we got the test harness up and running, and you learned how it works. You know that, for code to be loaded into the test harness, it has to be in the Blocks folder. And now that we have completed writing the code, we can move the TechnoratiBlock.js file into the Blocks folder (see Figure 9-12).

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