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Figure 6-3. A label acting as a clock By using an already existing widget as the starting point for a new widget, you avoid having to develop all the logic needed for painting, size hints, and such. Instead you can focus on enhancing the widget with the functionality you need. Let s see how this is done. First, there must be a method that checks the time at even intervals once every second, for example. The text has to be updated to the current time each time it is checked. To check the time every second, you can use a QTimer. A timer object can be set up to emit the timeout signal at a given interval. By connecting this signal to a slot of the clock label, you can check the time and update the text accordingly every second. Listing 6-7 shows the class declaration for the ClockLabel widget. It has a slot, updateTime, and a constructor. That (and inheriting QLabel) is all you need to implement this custom behavior. Listing 6-7. The ClockLabel class declaration class ClockLabel : public QLabel { Q_OBJECT public: ClockLabel( QWidget *parent = 0 ); private slots: void updateTime(); };

The ability to substitute variables, control program flow, and execute small snippets of Python are all very useful, but what gives templates their real value is the ability to define template blocks and call them from other templates to produce complex page layouts with as little duplication of effort as possible. In the following sections, you ll learn about some of the ways Mako allows you to do this.

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That is, an attacker can simply use his browser to navigate our web application to a page containing such a form, and then extract the value from the hidden field in the form He now has a copy of a token that our application will consider valid under this validation scheme in security engineering parlance, the attacker was able to use our own application as an oracle to obtain a valid token without having to know the secret key that is used to generate the tokens.

A def block is rather like a Python function in that each def block has a name, can accept arguments, and can be called. As an example, let s update the list-generating code you used earlier to be a reusable def block: <% items = [ ('James', 'http://jimmyg.org'), ('Ben', 'http://groovie.org'), ('Philip', ''), ] %> ${navigation_links('James', items)} <%def name="navigation_links(selected, links)"> <%def name="link(label, url)"> % if url: <a href="${url}">${label}</a> % else: ${label} % endif </%def> <ul> % for item in links: <li>\ % if item[0] == selected: <b>${link(item[0], item[1])}</b>\ % else: ${link(item[0], item[1])}\

You can see the implementation of the ClockLabel widget in Listing 6-8. Starting from the bottom, the updateTime() slot is very simple all it does is set the text to the current time. The QTime::toString() method converts a time to a string according to a formatting string, where hh represents the current hour and mm represents the minute. A QTimer object is created in the constructor. The interval (how often the timeout signal is to be emitted) is set to 1,000 milliseconds (1 second).

% endif </li> % endfor </ul> </%def> There s quite a lot going on in this example, so let s take it piece by piece You can see you have two functions The first is called navigation_links() and takes two arguments: selected is the label of the currently selected navigation link, and links is the list of links Within the navigation_links() function, there is another function called link() that generates an HTML link if a URL is associated with the navigation link Finally, there is a definition of the links defined in Python block at the top and some code to call the navigation_links() function at the bottom Save this template code as navigationhtml You can then test it by adding a new action to the controller: def navigation(self): return render('/navigationhtml') The template generates the following HTML source: <ul> <li> </b> <li> <a href="http://groovie.

How can we prevent this further attack The key observation is that our application not only needs to be able to tell if it is receiving a request with any action token that it had previously sent to some browser, but rather needs to check that an incoming request includes a token value that had been previously sent to the same browser! Since (due to the same-origin policy), third-party pages in a different domain cannot inspect or set cookies in our domain, we can reliably distinguish between browser instances based on a cookie we have set at an earlier time We can thus tie the validity of an action token to a particular browser instance by binding the value of the action token to the value of a suitable cookie.

Divide the number of milliseconds by 1,000 to get the equivalent number of seconds. 1,000 milliTip

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