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## Check privilege function logic

This topic explains the logic for checking user privileges. There are two reasons why a user may not have a privilege:

- The user is not logged in and the PUBLIC user does not have the necessary privilege.
- The user is logged in, but has not been granted the necessary privilege.

In the first case, if check_privilege finds that the user is not logged in, it returns FALSE and redirects the user's browser to the Single Sign-On Server so the user can log on. In the second case, the user should be informed that they do not have the required privilege.

The following example checks whether a user has the EXECUTE privilege on an object:

    procedure display_user_mgr
     ( ... )
     begin -- always begin with a privilege check
       if wwsec_app_priv.check_privilege
       (
          p_object 		=> wwsec_api.ADMIN_OBJ,
          p_privilege 	=> wwsec_api.EXECUTE_PRIV,
          p_name 		=> 'UserManager' -- the unique name of the object instance,
          p_requested_url => wwctx_api.get_product_schema || '.wwsec_app_user_mgr.display_user_mgr'
       )
     then
      -- processing will not reach here if the user has insufficient privileges...
      -- privileged application code may follow
     end if;
     end display_user_mgr;

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