dataservices-api/client/templates/20_public_functions.erb

--
-- Public geocoder API function
--
-- These are the only ones with permissions to publicuser role
-- and should also be the only ones with SECURITY DEFINER

CREATE OR REPLACE FUNCTION <%= GEOCODER_CLIENT_SCHEMA %>.<%= name %> (<%= params_with_type_and_default %>)
RETURNS <%= return_type %> AS $$
DECLARE
  ret <%= return_type %>;
  username text;
  orgname text;
BEGIN
  IF session_user = 'publicuser' OR session_user ~ 'cartodb_publicuser_*' THEN
    RAISE EXCEPTION 'The api_key must be provided';
  END IF;
  SELECT u, o INTO username, orgname FROM _cdb_entity_config() AS (u text, o text);
  -- JSON value stored "" is taken as literal
  IF username IS NULL OR username = '' OR username = '""' THEN
    RAISE EXCEPTION 'Username is a mandatory argument, check it out';
  END IF;
  SELECT <%= GEOCODER_CLIENT_SCHEMA %>._<%= name %>(username, orgname, <%= params %>) INTO ret;
  RETURN ret;
END;
$$ LANGUAGE 'plpgsql' SECURITY DEFINER;