CREATE FUNCTION _api.post_insert()
RETURNS TRIGGER
LANGUAGE plpgsql VOLATILE
AS $BODY$
DECLARE
	_user_id INTEGER;
BEGIN
	_user_id = _api.get_user_id();

	NEW.content	:= _api.trim(NEW.content);

	PERFORM _api.validate_text(
		_text => NEW.content,
		_column => 'content',
		_min => 1,
		_max => 4096
	);

	INSERT INTO xssbook.post (
		user_id,
		content
	) VALUES (
		_user_id,
		NEW.content
	)
	RETURNING id
	INTO NEW.id;

	RETURN NEW;
END
$BODY$;

GRANT EXECUTE ON FUNCTION _api.post_insert()
	TO rest_user;
GRANT INSERT ON TABLE api.post
	TO rest_user;
GRANT INSERT ON TABLE xssbook.post
	TO rest_user;
GRANT UPDATE ON TABLE sys.post_id_seq
	TO rest_user;

CREATE TRIGGER api_post_insert_trgr
	INSTEAD OF INSERT
			ON api.post
			FOR EACH ROW
				EXECUTE PROCEDURE _api.post_insert();
