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We now introduce certificates and CAs into our digital signature scheme, and show how to implement the Sign() and Verify() operations using S() and V() as subroutines. Each principal who would like to construct digital signatures must have her identity bound to her public key. The principal generates a key pair and then approaches a CA to request a certificate that attests to the binding. A certificate is simply a document that is digitally signed by the CA. Before a CA can sign certificates that attest to the identities of others, it first generates its own public/private key pair and signs a certificate that attests to its own identity. In addition to containing the name of the principal and a public key, the certificates that we use also store an expiration date (exp), after which the certificate will no longer be considered valid. Certificates for principal P will be denoted as C(P), and will have two parts: a text part and a signature part, denoted as C(P) = (Ctext(P),Csig(P)). Also, we use kp(P) to denote the public key of a principal, and ks(P) to denote the secret key of the principal. The text part of the certificate that the CA constructs for itself may look as follows:

Now that the base template is in place, you can start creating the templates for the web site content. Create a new template in the templates/derived/page directory called view.html. This will be the template used by the page controller s view action. Add the following content to it: <%inherit file="/base/index.html"/> ${c.content} You ll now need to update the view() action in the controller to use this template: def view(self, id): c.title = 'Greetings' c.heading = 'Sample Page' c.content = "This is page %s"%id return render('/derived/page/view.html') Now when you visit http://localhost:5000/page/view/1, you should see the page shown in Figure 8-2.

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avoiding the need to intercept the ToolTip event for the view widget or the scene. When working with item views, you can use the model-view architecture to set tooltips for each item by assigning data to Qt::ToolTipRole. If you want to provide custom tooltips for the view, reimplement the viewportEvent(QEvent*) method instead of event().

Now that you have the project s templates and controller set up, you need to start thinking about the model. As you ll recall from 1, Pylons is set up to use a Model View Controller architecture, and SQLAlchemy is what is most often used as the model. 7 explained SQLAlchemy in detail, but now you ll see how to apply that theory to a real Pylons project. If you haven't already done so you'll need to install SQLAlchemy 0.5 which is the version used in this book. You can do so with this command: $ easy_install "SQLAlchemy>=0.5,<=0.5.99" Let s begin by setting up the engine. Open your project s config/environment.py file, and after from pylons import config, you ll see the following: from sqlalchemy import engine_from_config You learned about engines in 7 when you created one directly. Pylons uses the engine_from_config() function to create an engine from configuration options in your project s config file instead. It looks for any options starting with sqlalchemy. in the [app:main] section of your development.ini config file and creates the engine based on these options. This means that all you need to do to configure SQLAlchemy is set the correct options in the config file.

The signature part of the CA s certificate is computed by applying the CA s secret key to the preceding text:

Figure 9-4. The same widget shows different tooltips for different parts. Let s get started with intercepting the right event and set the tooltip text for each of the four squares. All events are passed through the event method before some of them are distributed to the different handlers, such as the paintEvent, mouseMoveEvent, and keyPressEvent methods. Because there is no toolTipEvent method, you have to intercept the event in the event method. The source code for the interception is shown in Listing 9-5. Because the event method receives a QEvent object, you must use the type property to determine whether a ToolTip event was received. The QEvent class is the base class for all specialized event classes, so as soon as you can tell that you are dealing with a tooltip, you can cast the QEvent object into a QHelpEvent object.

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