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Remember that the /derived/account/signin.html page isn t a normal template. It has to be set up so that it returns a string that AuthKit can use Python string interpolation on to replace the %s character with the action. Since you are not using the template with AuthKit this time, you have to add the form action yourself. (If you are using FORM_ACTION instead of %s, you ll have to adjust the last line accordingly.) You ll also need another route for the signinagain() action in the config/routing.py file: map.connect('signinagain', '/signinagain', controller='account', action='signinagain') Finally, add the import for h into the account controller: import simplesite.lib.helpers as h This new action is now accessible from /signinagain and presents the sign-in form with the action adjusted to point to the sign-in screen. There s one final change to make. You ll need to update the base/index.html template so the Signed in as... link isn t shown on the sign-in again page. Make the relevant line look like this: % if h.auth.authorized(h.auth.is_valid_user) and not ( request.urlvars['controller'] == 'account' and request.urlvars['action'] in ['signout', 'signinagain']): If you sign in as user foo and try to access a URL such as http://localhost:5000/page/list, you will now be shown the page in Figure 19-5. Clicking the sign-in link will then take you to the sign-in again page, where you can sign in as a different user. With these changes in place, the customization of the error documents support is complete.

Figure 7-3. JavaScript HTML order page In the preceding example, the client browser computes the price to be paid based on the number of pizzas the user would like to order. However, as you learned before, you cannot trust the client! A malicious user could simply save the HTML page to disk (as we illustrated earlier in this chapter), delete the JavaScript from the HTML page, substitute 10000 for the quantity and 0 for the price, and submit the form. Alternatively, a malicious user could also just submit an HTTP request such as GET /submit_order qty=1000&price=0&Order=Pay and completely bypass the price computation done by the JavaScript! The solution to eliminating the problem of not being able to trust the client, in this case, is to do the price computation on the server, and charge the user the price that is computed by the server. While JavaScript can be used to make the web page more interactive for the client, any data validation or computations done by the JavaScript cannot be trusted by the server. The computations must be redone on the server to ensure security.

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Listing 3-5 Basic demonstration of the push button widget ButtonDialog::ButtonDialog( QWidget *parent ) : QDialog( parent ) { clickButton = new QPushButton( "Click me!", this ); toggleButton = new QPushButton( "Toggle me!", this ); toggleButton->setCheckable( true ); QHBoxLayout *layout = new QHBoxLayout( this ); layout->addWidget( clickButton ); layout->addWidget( toggleButton ); connect( clickButton, SIGNAL(clicked()), this, SLOT(buttonClicked()) ); connect( toggleButton, SIGNAL(clicked()), this, SLOT(buttonToggled()) ); } void ButtonDialog::buttonClicked() { QMessageBox::information( this, "Clicked!", "The button was clicked!" ); } void ButtonDialog::buttonToggled() { QMessageBox::information( this, "Toggled!", QString("The button is %1!") arg(toggleButton->isChecked() "pressed":"released") ); } Various platforms have different placements of buttons at the bottom of dialogs For example, in a Mac or a Gnome desktop, the rightmost button is the accepting one (Ok), whereas in Windows the rightmost button is usually Close or Cancel By using the QDialogButtonBox widget, you can get the ordinary buttons automatically.

Even with all the changes you ve made so far, SimpleSite is still rather simple. After all, it can be used to edit only plain text, which isn t too helpful for a website. In this section, you ll update the edit page functionality to use the YUI Rich Text Editor, and you ll change the page view template to allow HTML to be rendered. Let s start by thinking about the JavaScript required to change the content text area on the edit page to use a visual editor. The editor you ll use is the YUI Rich Text Editor and is documented at

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