Restrict access to buttons, regions, etc. on a per user basis?

Question

My application restricts access to buttons, regions, etc. on a per user basis.
Here is my application logic...
1. A User can only edit items they own.
2. A Super-User can edit all items
So, when a user logs in, I use a post-authentication process to set the user ID to an application level item.
Now, for example, to have an edit button display on a page, I need to check the item's owner ID against the application level user ID...and check to see if this user is on the Super User list via a query.(which could be set to another application level item upon login...I guess)
Question...What is the best way to do this? Conditional display? Authorization scheme?
Would something like the following work for a Conditional Display?
Condition: SQL Expression
&USER_ID.=&P6_ITEM_OWNER_ID. OR USER_ID in (select USER_ID from table where USER_ID=&USER_ID.)
How would I do this with an Authorization Scheme? (I like the idea of updating the logic in single location...but I'm not sure if it is possible because I have to check PX_OWNER_ID would be different on each page.)

Answer 1

Hi Denes,
Thanks for your code which allows user to edit (if authorized) and view (if not).
But some how - I do not get the image to show up - instead it show a small underline.
From SQL point of view - here is what I get - when i run the sql
'<img src="/i/ed-item.gif">',2,CR TEST,,,,dune2.cit.cornell.edu,CRDMTEST.CIT.CORNELL.EDU,PSPROD,,,CRDMTEST
Here is my wrap_image function
create or replace function wrap_image(p_user_name in varchar2,p_dm_name_id in number)
return varchar2 IS
v boolean := False;
ret_val varchar2(1000);
begin
dbms_output.put_line('user='||p_user_name);
dbms_output.put_line('dm_name='||p_dm_name_id);
-- Check authorization if the user is super user - return true, else if he has edit priv on dm_name_id - return true - else false
v:=ACL_DMTOOLS_DM_PRIV(p_user_name,p_dm_name_id);
if v then
ret_val := '<img src="/i/ed-item.gif">';
ret_val := ''''||ret_val||'''';
dbms_output.put_line('TRUE');
else
ret_val := '';
dbms_output.put_line('FALSE');
end if;
return ret_val;
end;
Thanks for your great educational site.
Regards
atul