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For a project using Genshi instead of Mako, the Mako lines might be replaced with this: ('templates/**.html, 'genshi', None), Similar options can also be set in the setup.cfg file if you prefer. See http://babel.edgewall.org/wiki/Documentation/cmdline.html#extract for details. Once you ve changed the setup.py file, you may need to run this command again to reinstall the package in development mode so that the changes are recognized: $ python setup.py develop With the changes made, you can use Babel to extract messages from the templates as well as the Python source files in your project: $ python setup.py extract_messages running extract_messages extracting messages from translatedemo/__init__.py extracting messages from translatedemo/websetup.py extracting messages from translatedemo/config/__init__.py extracting messages from translatedemo/config/environment.py extracting messages from translatedemo/config/middleware.py extracting messages from translatedemo/config/routing.py extracting messages from translatedemo/controllers/__init__.py extracting messages from translatedemo/controllers/error.py extracting messages from translatedemo/controllers/hello.py extracting messages from translatedemo/lib/__init__.py extracting messages from translatedemo/lib/app_globals.py extracting messages from translatedemo/lib/base.py extracting messages from translatedemo/lib/helpers.py extracting messages from translatedemo/model/__init__.py extracting messages from translatedemo/templates/hello.html extracting messages from translatedemo/tests/__init__.py extracting messages from translatedemo/tests/test_models.py extracting messages from translatedemo/tests/functional/__init__.py extracting messages from translatedemo/tests/functional/test_hello.py writing PO template file to translatedemo/i18n/translatedemo.pot Notice this time that the templates/hello.html file is included in the extraction process.

class KeyboardFilter : public QObject { public: KeyboardFilter( QObject *parent = 0 ) : QObject( parent ) {} protected: bool eventFilter( QObject *dist, QEvent *event ) { if( event->type() == QEvent::KeyPress ) { QKeyEvent *keyEvent = static_cast<QKeyEvent*>( event ); static QString digits = QString("1234567890"); if( digitsindexOf( keyEvent->text() ) != -1 ) return true; }.

Now that you have a good idea of how to use Mako templates within Pylons, you can turn your attention to how Pylons links the render() function you call to the template engine code as well as how it adds default variables. Once you understand the basic principles, you ll look at how to use

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Run a version of SimpleWebServer that includes a file-upload feature as well as basic HTTP authentication (see 4) Create a web page that executes an XSRF attack against the server, such that if a user who has previously logged into SimpleWebServer visits your page, a file of your choosing is uploaded without the user knowing (eg, use an invisible IFRAME to conceal the attack) b Implement one of the preventive measures against XSRF attacks introduced in 10 Test that the preceding attack page no longer works (You might want to read the section on MACs in 15 to help you implement these preventative measures) c Introduce an XSS vulnerability into SimpleWebServer (not necessarily on the URL that handles file upload).

return QObject::eventFilter(dist, event); } }; To test the event filter, you can install it on a QLineEdit (its source code is shown in Listing 6-17). The QLineEdit and KeyboardFilter objects are created like any other objects. Then the installEventFilter(QObject*) is used to install the filter on the line edit before the editor is shown. Listing 6-17. To use an event filter, you must install it on a widget. The events to that widget are then passed through the filter. int main( int argc, char **argv ) { QApplication app( argc, argv ); QLineEdit lineEdit; KeyboardFilter filter; lineEdit.installEventFilter( &filter ); lineEdit.show(); return app.exec(); } Try using the line edit. The key presses are filtered, but numbers can still be forced into the editor by using the clipboard. You must be careful when implementing and applying event filters there might be hard-to-foresee side effects. If you are careful when designing your filters you can enhance applications by filtering, reacting to, and redirecting events making interaction easier for the user. An example is to catch keyboard events in a draw area, redirecting them to a text editor, and moving the focus. This saves the user from clicking the text editor before entering text, making the application more user-friendly.

the alternative template languages Pylons supports, as well as how to add support for your own template languages If you intend to use only Mako in your Pylons applications and are not interested in understanding what is going on behind the scenes, you might prefer to jump ahead to the next chapter to begin learning about forms Let s start by looking at the definition of the pylonstemplatingrender_mako() function that you imported as render() in the greeting controller It looks something like this: def render_mako(template_name, extra_vars=None, cache_key=None, cache_type=None, cache_expire=None): def render_template(): globs = extra_vars or {} globsupdate(pylons_globals()) template = globs['app_globals']mako_lookupget_template(template_name) return templaterender(**globs) return cached_template(template_name, render_template, cache_key=cache_key, cache_type=cache_type, cache_expire=cache_expire) The first thing you should notice is that the function supports caching with a call to cached_ template().

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