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<%inherit file="/base/index.html" /> <%def name="heading()"> <h1 class="main">Page Deleted</h1> </%def> <p>This page has been deleted.</p> Later in the chapter you ll see how you can use a session and a flash message to display a simple message like this on a different page rather than needing to create a template for it. At this point, you have a very simple (yet perfectly functional) web site for creating pages and editing their content. There is clearly more that could be done, though, so now it s time to turn your attention to other aspects of the SimpleSite application you are creating.

Listing 11-25. Applying the filters when the user picks one from the list void FilterDialog::filterChanged( QString filter ) { if( filter.isEmpty() ) { ui.filteredLabel->setPixmap( *(ui.originalLabel->pixmap() ) ); } else { QImage filtered = filters[ filter ]-> filter( ui.originalLabel->pixmap()->toImage() ); ui.filteredLabel->setPixmap( QPixmap::fromImage( filtered ) ); } } The last piece of the puzzle is a main function that creates a QApplication object and then shows the dialog. The project file is not affected by the usage of plugins, so running qmake -project, followed by qmake and make, will do the job.

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Now that the basic structure of the controller is in place, the users of SimpleSite will need a quick and easy way of adding, editing, and deleting the pages without having to enter the appropriate URLs in the browser address bar. Modify the derived/page/view.html template so that it includes some links in the page footer: <%inherit file="/base/index.html"/> <%def name="title()">${c.page.title}</%def> <%def name="heading()"><h1>${c.page.heading or c.page.title}</h1></%def> ${c.page.content} <%def name="footer()"> ## Then add our page links <p> <a href="${h.url_for(controller='page', | <a href="${h.url_for(controller='page', | <a href="${h.url_for(controller='page', id=c.page.id)}">Edit Page</a> | <a href="${h.url_for(controller='page', id=c.page.id)}">Delete Page</a> </p> ## Include the parent footer too ${parent.footer()} </%def>

Under the Lies column of the table, we list various security techniques that can be used to deal with both users and adversaries who attempt to lie to a system. Consider the use of digital signatures, which can prevent users from lying about statements that other users make. (Digital signatures are covered in more detail in 15, and more references are given in Section A.6.) A system that employs digital signatures may require users to digitally sign statements, thus preventing tampering with those statements. For example, assume that Alice wants to say Here is the answer to your query to Bob, but can only communicate with Bob through Mallory. Alice sends a message containing the answer and her digital signature on the message to Mallory. If Mallory attempts to modify Alice s message, Bob will notice that the digital signature does not match the message. Hence, digital signatures prevent Mallory from lying about what Alice said. If we are unable to prevent lies, we can design the system so that it can tolerate lies without affecting the correctness. To contain lies, a Byzantine agreement protocol can be used such that even if Mallory modifies a message that Alice wants to pass on to Bob, all the people involved in a decision can come to agreement. Byzantine agreement protocols can guarantee agreement so long as the number of people involved in the decision is greater than three times the number of liars, and all participants can communicate with one another without restriction.

Caution Because the filter s source files are located in a subdirectory placed inside the directory containing the application, the qmake -project command will include the filter s source files in the project alongside the application s files. Make sure to remove the filter s files from the resulting project file before building or adding a -norecursive switch to qmake invocation to stop qmake from peeking into the subdirectories.

action='list', id=None)}">All Pages</a> action='new', id=None)}">New Page</a> action='edit', action='delete',

All this code brings you to the application shown in Figure 11-5. Looking back at the size of the code, it is hard to see how powerful the application is. It can be extended and modified almost without limitations, and the added complexity is relatively small.

Tools such as firewalls and certificate revocation help a security designer defend against attempts at system infiltration. Firewalls are composed of one or more system components that prevent an adversary from breaking into computers within the perimeter of the firewall, such that data and computational resources available within the perimeter of the firewall cannot be used to an adversary s advantage. (Firewalls can also be used to prevent failure due to some types of DoS attacks.2) Once a system has been infiltrated, a technique such as certificate revocation may help us recover from the infiltration. If an adversary gets access to and compromises a user s private key after a system infiltration, certificate revocation allows us to break the association between that user and his public key, such that the private key becomes ineffective.

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