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Generally speaking, it is a good idea to try to keep your model and templates as separate as possible. You should always perform all model operations in your controller and never in a template. This is so that you, and other people working on your project, always know where changes to your model are happening so that code is easy to maintain. To avoid the risk of a lazy programmer performing operations on the model from within a template, you might prefer not to pass model objects directly to the controller and instead pass the useful attributes. In this case, rather than passing c.page, you might instead pass c.title, c.content, and other useful attributes rather than the whole object. In this book, I ll be strict about only using model objects for read-only access in templates, so it is OK to pass them in directly.

The class declaration of the image IO handler class TextImageHandler : public QImageIOHandler { public: TextImageHandler(); ~TextImageHandler(); bool read( QImage *image ); bool write( const QImage &image ); bool canRead() const; static bool canRead( QIODevice *device ); }; The simplest of the more complex methods is the write method, shown in Listing 11-7 It needs very little error checking and just streams the parts of the image to a QTextStream writing to the device specified The device method returns the same device as is set using setDevice in the create method of TextImagePlugin (refer to Listing 11-4) It is used when creating the text stream stream When the stream is set up, a prefix is written to the file All ASCII art images start with a line reading TEXT Then the dimensions are written as width x height, where the x serves as a separator character.

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Every Pylons project has a base controller in the project s lib/base.py file. All your project s controllers are by default derived from the BaseController class, so this means that if you want to change the behavior of all the controllers in your project, you can make changes to the base controller. Of course, if you want to derive your controllers directly from pylons.controllers. WSGIController, you are free to do so too. The SimpleSite base controller looks like this: """The base Controller API Provides the BaseController class for subclassing. """ from pylons.controllers import WSGIController from pylons.templating import render_mako as render from simplesite.model import meta class BaseController(WSGIController):

In the preceding example, the CA signed a certificate for Alice. However, as you can imagine, if the CA had to authenticate every principal in the system prior to signing a certificate, the CA could get quite overburdened. In some systems, the CA can authorize another entity called a registration authority (RA) to authenticate users. The CA signs a certificate binding the RA s identity to the RA s public key, and then the RA can authenticate principals on behalf of the CA. In such a system, the signature function is modified to also package the RA s certificate into the signature, and the preceding verification function is modified to check the signature on the RA s certificate. You could imagine generalizing such a system to allow for an arbitrary number of intermediaries, where a chain of certificates is verified, each certificate being a link in a chain that leads to the root CA certificate. There have also been vulnerabilities in which intermediate certificates for RAs have not been verified properly. In one case, because Internet Explorer did not properly verify intermediate RA certificates, it was possible for any web site with a signed certificate to sign another one for any other arbitrary domain. Internet Explorer would not verify the intermediate certificate, and as a result would trust the arbitrary domain (see http://seclists.org/ bugtraq/2002/Aug/0111.html). Hence, it is important to be extremely careful when verifying signatures in even moderately complex systems.

You get the dimensions from the image given as an argument to the method The prefix and dimensions make up the header; the rest is the image data..

def __call__(self, environ, start_response): """Invoke the Controller""" # WSGIController.__call__ dispatches to the Controller method # the request is routed to. This routing information is # available in environ['pylons.routes_dict'] try: return WSGIController.__call__(self, environ, start_response) finally: meta.Session.remove() All the individual controllers that you create with the paster controller command also import the render() function from this file, so if you want to change the templating language for all your controllers, you can change the render() import in this file, and all the other controllers will automatically use the new function. Of course, you will have to set up the templating language in your project s config/environment.py file too. This was described in 5.

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