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Vastly improved permission sharing function.

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This commit is contained in:
Andrew McMillan 2006-11-09 00:27:23 +13:00
parent 653129f983
commit 23c4d6ce3a
1 changed files with 51 additions and 11 deletions
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62
dba/caldav_functions.sql
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@ -198,14 +198,54 @@ END;
' LANGUAGE 'plpgsql' IMMUTABLE STRICT;
CREATE or REPLACE FUNCTION get_permissions( INT, INT ) RETURNS TEXT AS '
SELECT rt.confers FROM relationship r1
JOIN relationship_type rt USING ( rt_id )
WHERE NOT rt.rt_isgroup
AND r1.from_user = $1 AND r1.to_user = $2
UNION
SELECT rt.confers FROM relationship r1
JOIN relationship r2 ON ( r1.to_user = r2.from_user)
JOIN relationship_type rt ON (r2.rt_id = rt.rt_id)
WHERE rt.rt_isgroup
AND r1.from_user = $1 AND r2.to_user = $2;
' LANGUAGE 'sql' IMMUTABLE STRICT;
DECLARE
in_from ALIAS FOR $1;
in_to ALIAS FOR $2;
out_confers TEXT;
tmp_confers TEXT;
dbg TEXT DEFAULT '''';
BEGIN
-- dbg := ''S-'';
SELECT rt1.confers INTO out_confers FROM relationship r1 JOIN relationship_type rt1 USING ( rt_id )
WHERE NOT rt1.rt_isgroup AND r1.from_user = in_from AND r1.to_user = in_to;
IF FOUND THEN
RETURN dbg || out_confers;
END IF;
-- RAISE NOTICE ''No simple relationships between % and %'', in_from, in_to;
SELECT rt1.confers, rt2.confers INTO out_confers, tmp_confers FROM relationship r1 JOIN relationship_type rt1 ON ( r1.rt_id = rt1.rt_id )
LEFT OUTER JOIN relationship r2 ON ( r1.to_user = r2.from_user ) JOIN relationship_type rt2 ON ( r2.rt_id = rt2.rt_id )
WHERE rt1.rt_isgroup AND NOT rt2.rt_isgroup AND r1.from_user = in_from AND r2.to_user = in_to;
IF FOUND THEN
-- RAISE NOTICE ''Permissions to group % from group %'', out_confers, tmp_confers;
-- FIXME: This is an oversimplification
-- dbg := ''C-'';
IF out_confers = tmp_confers THEN
RETURN dbg || out_confers;
ELSE
IF length( out_confers ) < length( tmp_confers ) THEN
RETURN dbg || out_confers;
ELSE
RETURN dbg || tmp_confers;
END IF;
END IF;
END IF;
-- RAISE NOTICE ''No complex relationships between % and %'', in_from, in_to;
SELECT rt1.confers INTO out_confers, tmp_confers FROM relationship r1 JOIN relationship_type rt1 ON ( r1.rt_id = rt1.rt_id )
LEFT OUTER JOIN relationship r2 ON ( rt1.rt_id = r2.rt_id )
WHERE rt1.rt_isgroup AND r1.from_user = in_from AND r2.from_user = in_to AND r1.from_user != r2.from_user AND r1.to_user = r2.to_user;
IF FOUND THEN
-- dbg := ''H-'';
-- RAISE NOTICE ''Permissions to shared group % '', out_confers;
RETURN dbg || out_confers;
END IF;
-- RAISE NOTICE ''No common group relationships between % and %'', in_from, in_to;
RETURN '''';
END;
' LANGUAGE 'plpgsql' IMMUTABLE STRICT;