String uppUri = pathInfo.substring(startOfData);
String[] parts = uppUri.split("/", 3); // 0 = pid, 1= name, 2 = sec key
String variableName = parts[1];
String paintableId = parts[0];
StreamVariable streamVariable = pidToNameToStreamVariable.get(
paintableId).get(variableName);
String secKey = streamVariableToSeckey.get(streamVariable);
if (secKey.equals(parts[2])) {
VariableOwner source = getVariableOwner(paintableId);