Re: Web Application Platform

Hi Lennart,

Please take a look the Vlib example and its use to ICallback interface:

public class net.sf.tapestry.vlib.Protected extends BasePage .. {

    ..

    /**
     *  Checks if the user is logged in.  If not, they are sent
     *  to the {@link Login} page before coming back to whatever this
     *  page is.
     *
     **/
    public void validate(IRequestCycle cycle) throws RequestCycleException
    {
        Visit visit = (Visit) getVisit();

        if (visit != null && visit.isUserLoggedIn())
            return;

        // User not logged in ... redirect through the Login page.

        Login login = (Login) cycle.getPage("Login");

        login.setCallback(new PageCallback(this));

        throw new PageRedirectException(login);
    }

    ..

}

public class net.sf.tapestry.vlib.pages.Login extends BasePage .. {

    ..

    private ICallback callback;

    public void setCallback(ICallback value)
    {
        callback = value;

        fireObservedChange("callback", value);
    }

    public ICallback getCallback()
    {
        return callback;
    }

    ..

    /**
     *  Sets up the {@link Person} as the logged in user, creates
     *  a cookie for thier email address (for subsequent logins),
     *  and redirects to the appropriate page ({@link MyLibrary}, or
     *  a specified page).
     *
     **/

    public void loginUser(Person person, IRequestCycle cycle)
        throws RequestCycleException, RemoteException
    {
        ..

        // After logging in, go to the MyLibrary page, unless otherwise
        // specified.

        if (callback == null)
            cycle.setPage("MyLibrary");
        else
            callback.performCallback(cycle);
        ..

    }
}

regards Malcolm

p.s. we really need to document this in the DevelopersGuide

>From: Lennart Benoot <[email protected]>
>To: [email protected]
>CC: [email protected]
>Subject: [Tapestry-developer] Web Application Platform
>Date: Thu, 12 Dec 2002 15:28:10 +0100
>
>Hey All,
>
>I am currently in the process of defining a web application platform to 
>provide web services. We have chosen Tapestry as MVC layer. I have a few 
>problems I haven't been able to resolve (at least not in an elegant way):
>
>1) I want the whole application to be available only for logged in users. 
>We have an existing framework for security. I think when a request comes 
>in, the front controller servlet should check wether the user has logged 
>in. If not, reroute the user to the login page. How do I do this in 
>tapestry?
>
>2) Authorisation is also an important part of the web app platform. I would 
>like to call some java-code whenever a new page is loaded. This code should 
>check wether the user is allowed to access the page. If the user does not 
>have the right permissions, he is rerouted to some other page. What would 
>be a good way to do this?
>
>Thanks in advance,
>Lennart
>
>
>
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