Re: A good way to test for group membership?

Hello Neal,

Neal Lindsay schreef:

>
> I currently use dummy
> tables with select permissions given to certain groups and attempt select
> statements on them, but there must be a better way. How does PostgreSQL do
> it internally?

I have made the following PlPgsql function which returns true if a user is member
of a group:
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CREATE FUNCTION groupmember (int, int) RETURNS BOOLEAN AS
'
DECLARE
list pg_group.grolist%TYPE;
aanw bool := false;
i int4 := 1;
group ALIAS FOR $1;
user ALIAS FOR $2;
BEGIN
  SELECT grolist into list from pg_group where grosysid = $1;

  WHILE ((list[i] IS NOT NULL) AND (aanw=false)) LOOP
    IF (list[i] = $2) THEN
       aanw := true;
    END IF;
    i := i + 1;
  END LOOP;

  RETURN aanw;
END;' LANGUAGE 'PlPgSQL';

Have Fun!
Arian.
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And then you could even make this view:
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CREATE VIEW users_by_group (grosysid, usesysid) AS
SELECT pg_group.grosysid, pg_user.usesysid FROM pg_group, pg_us
er WHERE groupmember(pg_group.grosysid, pg_user.usesysid);
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