[rules-users] Newbie question: can I create a variable in the rules file?
Michael Neale
michael.neale at gmail.com
Fri Mar 9 02:00:27 EST 2007
hi Kris.
Well, you can't bind a variable to a new instance on the LHS - on the LHS
you have no control over when conditions are evaluated, so the value of
"now" would not necessarily be what you think.
Nevertheless, I can see what you want:
rule CanDoHisStuff
activation-group "permissions"
when
c: PermissionCheck(name == "stuff", action == "do", granted = false)
ap: AppProps(startDate < ( now() ), endDate > ( now() ) )
Role(name == "A Role")
then
c.grant();
end;
this assumes you have a function :
function Date now()
return new Date();
end
(I havent' tested this, just a suggestion).
On 3/8/07, Rented User <rented at gmail.com> wrote:
>
> Hi,
>
> I'm mew to this rules stuff, and although I've looked at rules engines
> such as Corticon before, I got introduced to JBoss Rules through JBoss
> Seam's security mechanism.
>
> I'm trying to expand on Seam's built in functionality to assess a user's
> permissions. My use case is that a user of the system may or may not have
> permission to a resource based on the user's role AND the current date. The
> system accepts certain actions only if "now" is between a certain start and
> end date. What I'd like to do is something like this:
>
> rule CanDoHisStuff
> activation-group "permissions"
> when
> c: PermissionCheck(name == "stuff", action == "do", granted = false)
> now: new Date()
> <--------------------------------------------------------------How can I
> accomplish this?
> ap: AppProps()
> Role(name == "A Role")
> eval(now >= ap.startDate, now <= ap.endDate)
> then
> c.grant();
> end;
>
> Now, I understand that in my code, I could assert an object "now".
> However, a lot of the security is hidden behind the scenes in Seam. For
> example, this rules will be fired from an XML definition file. E.g.
>
> <page view-id="/restricted/doStuff.xhtml">
> <restrict>#{s:hasPermission('stuff', 'do', null)}</restrict>
> <navigation from-action="#{ createStuffManager.yesConfirmSave}">
> <end-conversation/>
> <redirect view-id="/restricted/viewStuff.xhtml"/>
> </navigation>
> </page>
>
> While I could start extending Seam's security model, that seems a bit
> invasive for such a simple task.
>
> Thanks
>
> /Kris
>
>
>
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
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