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We are now in a position to describe how to implement Sign() and Verify(). A principal, P, can produce a digital signature, sig, on a message, M, by computing S() with her secret key, and append her certificate:

"""Setup the SimpleSite application""" import logging from simplesite.config.environment import load_environment log = logging.getLogger(__name__) def setup_app(command, conf, vars): """Place any commands to setup simplesite here""" load_environment(conf.global_conf, conf.local_conf) # Load the models from simplesite.model import meta meta.metadata.bind = meta.engine # Create the tables if they aren't there already meta.metadata.create_all(checkfirst=True) When the paster setup-app command is run, Pylons calls the setup_app() function and loads the Pylons environment, setting up a SQLAlchemy engine as it does so. It then binds the engine to the metadata and calls metadata.create_all(checkfirst=True) to create any tables that don t already exist. Binding the metadata in this way connects the engine to the metadata object used by the classes, tables, and mappers in the model. You can think of it as a shortcut to set up the model without the complexity of a session. You ll now customize the default code so that it also adds a home page to the database. Add the following to the end of the setup_app() function: log.info("Adding homepage...") page = model.Page() page.title=u'Home Page' page.content = u'Welcome to the SimpleSite home page.' meta.Session.add(page) meta.Session.commit() log.info("Successfully set up.") You ll also need to add this import at the top: from simplesite import model

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Listing 11-2. Determining what the plugin can do with the given format and device QImageIOPlugin::Capabilities TextImagePlugin::capabilities( QIODevice *device, const QByteArray &format ) const { if( format == "ti" ) return (QImageIOPlugin::CanRead | QImageIOPlugin::CanWrite); if( !format.isEmpty() ) return 0;

Note The recommended way of adding an object to the SQLAlchemy session in SQLAlchemy 0.4 was to call the session's save() method. The session in SQLAlchemy 0.5 provides the add() method instead. Since this book covers SQLAlchemy 0.5, the examples will use the add() method.

We will refer to the individual signature and certificate components of sig as sig.S and sig.C, respectively. The signature, sig, can be verified by any other party using Verify():

if( !device->isOpen() ) return 0; QImageIOPlugin::Capabilities result; if( device->isReadable() && TextImageHandler::canRead( device ) ) result |= QImageIOPlugin::CanRead; if( device->isWritable() ) result |= QImageIOPlugin::CanWrite; return result; } So how does Qt know which formats to ask for All image plugins report which formats they can handle with the keys method. The formats (or format, in this case) are put in a QStringList that is returned. The implementation is shown in Listing 11-3. Listing 11-3. Putting the image file formats in a QStringList QStringList TextImagePlugin::keys() const { return QStringList() << "ti"; } When the format is correct and can be handled, the last method comes into action. The create method shown in Listing 11-4 creates an instance of the custom TextImageIOHandler, configures it with a format and a device, and returns the result. A format is set for the handler so it can be made to handle several formats. There are many formats that are almost identical, so it can be useful to reduce the size of the source code. Listing 11-4. Creating and configuring an image IO handler QImageIOHandler *TextImagePlugin::create( QIODevice *device, const QByteArray &format ) const { QImageIOHandler *result = new TextImageHandler(); result->setDevice( device ); result->setFormat( format ); return result; } Before you can move on to the handler class, you must tell Qt that this class is a part of the plugin interface. You can do this by using the Q_EXPORT_PLUGIN2 macro, as shown in Listing 11-5. The macro is placed somewhere in the implementation file (not the header). The first argu-

To test this functionality, you should first make SimpleSite available in your virtual Python environment. Rather than installing SimpleSite as you would install a normal Python package, you can instead use a special feature of the setuptools package used by Easy Install called development mode. This has the effect of making other Python packages treat your Pylons project s source directory as if it were an installed Python egg even though it is actually just a directory structure in the filesystem. It works by adding a SimpleSite.egg-link file to your virtual Python installation's site-packages directory containing the path to the application. It also adds an entry to the easy_install.pth file so that the project is added to the Python path. This is very handy because it means that any changes you make to the SimpleSite project are instantly available without you having to create and

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