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When nothing else works, or if you choose to follow a different approach, you might end up in a situation in which you have to create your own widget. Creating a custom widget consists of implementing an interface of signals and slots as well as a set of applicable event handlers. To show you how this is done, I will guide you through the CircleBar widget (see Figure 6-6). The application shown in the figure has a CircleBar widget over a horizontal slider. Moving the slider changes the value of the circle bar, as does rotating the mouse wheel when hovering over the circle bar widget. The function of the CircleBar widget is to show a value between 0 and 100 by varying the size of the filled circle. A full circle means 100, while a dot in the middle means 0. The user can change the value shown by using the mouse scroll wheel.

Modify your attack page such that it uses the XSS vulnerability to thwart the XSRF protection, and again execute a file upload on behalf of a logged-in victim user who visits your malicious page..

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You ll look at the caching options in a minute, but let s start by looking at what happens in the render_template() function First, a dictionary is set up called globs, which contains any values you specified in the extra_vars keyword This dictionary is then updated with all the Pylons globals that I described earlier in the Default Pylons Template Variables section These are returned automatically by the pylons_globals() function One of the globals returned is the app_globals object, which you ll remember from 3, is an instance of your project s templatedemolibapp_globalsGlobals class This class has an attribute called mako_lookup, but if you look at your project s templatedemo/lib/app_globalspy file, you ll see that mako_lookup isn t defined there It is actually added dynamically when the application is first loaded by the configuration code in config/environmentpy Here are the relevant lines.

Figure 6-6. The CircleBar widget and a horizontal slider The main function, shown in Listing 6-18, sets up the slider and the circle bar. The code works by first creating a base widget for the QVBoxLayout that holds the slider and the circle bar. The slider and circle bar are then interconnected, so a valueChanged signal from one of them results in a setValue call to the other one. Then the base widget is shown before the application is started. Listing 6-18. Setting up the CircleBar and the slider int main( int argc, char **argv ) { QApplication app( argc, argv ); QWidget base; QVBoxLayout *layout = new QVBoxLayout( base ); CircleBar *bar = new CircleBar; QSlider *slider = new QSlider( Qt::Horizontal ); layout->addWidget( bar ); layout->addWidget( slider ); QObject::connect( slider, SIGNAL(valueChanged(int)), bar, SLOT(setValue(int)) ); QObject::connect( bar, SIGNAL(valueChanged(int)), slider, SLOT(setValue(int)) ); base.show(); return app.exec(); } From the main function you can see that the CircleBar widget needs a setValue(int) slot and a valueChanged(int) signal. To make the interface complete, you also need to have a value method to read the value.

You ll recall that you looked at the options to TemplateLookup earlier in the chapter: def load_environment(global_conf, app_conf): .. config['pylonsapp_globals'] = app_globalsGlobals() .. config['pylonsapp_globals']mako_lookup = TemplateLookup(..) .. Once the template has been returned, the final act of the render_template() function is to return the rendered template, passing in the variables you have specified as keyword arguments As you can see, although it takes a careful look through the code, the templating setup is actually easy to understand This is typical of the way most of Pylons works With a little digging through the source code, you can usually work out what is going on and customize the behavior you want in your own Pylons application..

10. Advanced exercise: Write an HTML filter that, given an arbitrary HTML document, produces an HTML document that will not result in the execution of script if loaded into a user s browser, but leaves basic markup (fonts, formatting, etc.) intact. Consider the possibility that the input document is not well-formed HTML, and also consider browser-specific features. Trade implementations with a fellow student or coworker and attack each other s solutions for example, try to find an input string such that the resulting document causes script of your choosing to execute if loaded into a browser. Resort to mean tricks, such as using CSS style sheets to cause script execution.

Don t be afraid to look at the Pylons source code. It is available online at http://pylonshq.com/hg.

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