Re: how to auto GRANT custom ACL on a new table?

Richard Huxton pisze:
> Maciej Sieczka wrote:
>> I need to modify this default PostgreSQL's behaviour, so that the ACL on
>> a new table in this schema is set to SELECT, INSERT, UPDATE, DELETE,
>> REFERENCES for "editors", and SELECT for "viewers", without having to
>> manually GRANT rights each time a new table is created. I can't
>> control this setting from the client software as these are various
>> programs, and even if I could it'd be still better anyway to have it
>> controlled in one single place on the server side. But how?
>>
>> From reading so far I *suppose* I should create a function which calls
>> an appropriate GRANT, and trigger it when a new record is added to
>> "pg_class". Is this doable?

> Afraid not. You can't add a trigger to a system table.

Too bad, but thanks much for clarifying this.

> The only real solution is to have your own function do both - create the
> table and then grant relevant permissions. Only allow client
> applications permissions to execute the function, not create tables
> directly.

Users connect to the DB with different clients - eg. OO.org Base. I
can't change, easily, how it creates a table (withouth modyfing the
source code of Base, or maybe the postgresql-sdbc plugin). It just
issues a "CREATE TABLE". So would MS Access, Kexi etc., which might come
into play later. Solving the issue on the server side would be most
robust. Really not doable?

>> An extra, but desired functionality, would be if I could also prevent
>> other "editors" from modifying the table *if* it is being currently
>> being edited by somebody. Is that feasible at all?

> Sure, just issue LOCK TABLE ... at the start of the transaction.

I guess you assume I can modify the client software, which isn't a
feasible option for me. Can I solve the issue on the server side -
detect the table is open and lock it then, unlock once closed?

Maciek