/**
* Check a manifest cookie and update.
*
* <p>This routine will check and update a manifest cookie value to ensure that we are not
* looping. If the incoming cookie is null, it simply initializes, othewise, it parses the cookie
* and returns null if it requires a reset.
*
* @param incoming the cookie from the client.
* @return either an updated cookie, or null if it was invalid.
*/
public static String updateManifestCookieValue(String incoming) {
int manifestRequestCount = 0;
long now = System.currentTimeMillis();
long cookieTime = now;
if (MANIFEST_ERROR.equals(incoming)) {
return null;
} else {
List<String> parts = AuraTextUtil.splitSimple(":", incoming, 2);
if (parts != null && parts.size() == 2) {
String count = parts.get(0);
String date = parts.get(1);
try {
manifestRequestCount = Integer.parseInt(count);
cookieTime = Long.parseLong(date);
if (now - cookieTime > MAX_MANIFEST_TIME) {
//
// If we have gone off by more than 60 seconds,
// reset everything to start the counter.
//
manifestRequestCount = 0;
cookieTime = now;
}
if (manifestRequestCount >= MAX_MANIFEST_COUNT) {
// We have had 5 requests in 60 seconds. bolt.
return null;
}
} catch (NumberFormatException e) {
//
// Bad cookie!
// This should actually be very hard to have happen,
// since it requires a cookie to have a ':' in it,
// and also to have unparseable numbers, so just punt
//
return null;
}
}
}
manifestRequestCount += 1;
return manifestRequestCount + ":" + cookieTime;
}
