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Of course, similar examples could be constructed using other scripting languages supported by the victim s browser (such as VBScript) To keep the examples short, we use the placeholder evil-script; to denote a sequence of JavaScript statements the attacker might inject (possible exploit payloads were discussed in more detail in Section 1023) For each class of XSS vulnerability (which is based on the context within an HTML document in which the injection occurs, such as simple text, within an href attribute, etc), we provide the following:.

Storing data structures in files or via third-party storage solutions clearly isn t the right approach for all data storage needs. Often the key requirement is to be able to search or select related sets of information. In that case, a database is a sensible way to go. I ll discuss the different types of databases you can use in your Pylons application.

Note If you don t set a pen or a brush, you ll end up with the standard settings, which usually means no

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If most of the data in your Pylons applications is in the form of classes, one very sensible way of storing that data is in an object database An object database looks like a Python dictionary that is automatically saved to disk You can store strings, numbers, dates, class instances, or even nested dictionaries and lists to create arbitrarily deep data structures Compared to a regular Python dictionary, you have to call a few extra commands to open the database and commit changes, but reading/setting values works exactly like the normal Python operations This avoids the complexity of converting a Python data structure to a non-Python medium (XML or RDBMS tables), and it allows you to quickly prototype a model because you can easily change and extend it Two object databases are available for Python: Durus and ZODB.

The next item you create is a QGraphicsSimpleTextItem. The constructor takes a QString text and the two parent pointers. Because the constructor does not let you position the text, call the setPos method to position the top-left corner of the item. Add a QGraphicsEllipseItem with a constructor that takes a rectangle and the parent pointers. Follow with a QGraphicsPolygonItem that takes a QPolygonF object and the parent pointers. The QPolygonF is initialized using a vector of QPointF objects. These points define the points between which the edges of the polygon are drawn. Set a pen and a brush for both of these objects. When these items have been added to the scene, create a QGraphicsView widget and call setScene(QGraphicsScene*) to tell it which scene to show. You then show the view and run app.exec() to start the event loop. The resulting window is shown in Figure 7-28. Listing 7-19. Populating a scene with standard shapes int main( int argc, char **argv ) { QApplication app( argc, argv ); QGraphicsScene scene( QRect( -50, -50, 400, 200 ) ); QGraphicsRectItem *rectItem = new QGraphicsRectItem( QRect( -25, 25, 200, 40 ), 0, &scene ); rectItem->setPen( QPen( Qt::red, 3, Qt::DashDotLine ) ); rectItem->setBrush( Qt::gray ); QGraphicsSimpleTextItem *textItem = new QGraphicsSimpleTextItem( "Foundations of Qt", 0, &scene ); textItem->setPos( 50, 0 ); QGraphicsEllipseItem *ellipseItem = new QGraphicsEllipseItem( QRect( 170, 20, 100, 75 ), 0, &scene ); ellipseItem->setPen( QPen(Qt::darkBlue) ); ellipseItem->setBrush( Qt::blue ); QVector<QPointF> points; points << QPointF( 10, 10 ) << QPointF( 0, 90 ) << QPointF( 40, 70 ) << QPointF( 80, 110 ) << QPointF( 70, 20 ); QGraphicsPolygonItem *polygonItem = new QGraphicsPolygonItem( QPolygonF( points() ), 0, &scene ); polygonItem->setPen( QPen(Qt::darkGreen) ); polygonItem->setBrush( Qt::yellow );

An example that shows how the injection can be exploited that is, how the attacker could inject strings into the HTML document such that script of his choosing would execute in the user s browser Prevention techniques for avoiding XSS in each particular context (e.g., escape a specific set of characters ) Rationale explaining why these guidelines are necessary and why they indeed prevent XSS in the given context

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