From e3aecb2aa90fdf4ea4c6c97fdac610c96d686b7f Mon Sep 17 00:00:00 2001
From: Brian Acton <acton@signal.org>
Date: Thu, 9 Jul 2020 17:43:12 -0700
Subject: [PATCH] apply a 12 hour fudge to daily user counting to account for
 last seen timestamp fuzzing

---
 .../textsecuregcm/storage/ActiveUserCounter.java     | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/service/src/main/java/org/whispersystems/textsecuregcm/storage/ActiveUserCounter.java b/service/src/main/java/org/whispersystems/textsecuregcm/storage/ActiveUserCounter.java
index c2528dc8f..40a480ecd 100644
--- a/service/src/main/java/org/whispersystems/textsecuregcm/storage/ActiveUserCounter.java
+++ b/service/src/main/java/org/whispersystems/textsecuregcm/storage/ActiveUserCounter.java
@@ -108,12 +108,12 @@ public class ActiveUserCounter extends AccountDatabaseCrawlerListener {
 
   @Override
   protected void onCrawlChunk(Optional<UUID> fromNumber, List<Account> chunkAccounts) {
-    long nowDays  = TimeUnit.MILLISECONDS.toDays(System.currentTimeMillis());
-    long agoMs[]  = {TimeUnit.DAYS.toMillis(nowDays - 1),
-                     TimeUnit.DAYS.toMillis(nowDays - 7),
-                     TimeUnit.DAYS.toMillis(nowDays - 30),
-                     TimeUnit.DAYS.toMillis(nowDays - 90),
-                     TimeUnit.DAYS.toMillis(nowDays - 365)};
+    long nowHours  = TimeUnit.MILLISECONDS.toHours(System.currentTimeMillis());
+    long agoMs[]  = {TimeUnit.HOURS.toMillis(nowHours - 1   * 24 - 12),
+                     TimeUnit.HOURS.toMillis(nowHours - 7   * 24),
+                     TimeUnit.HOURS.toMillis(nowHours - 30  * 24),
+                     TimeUnit.HOURS.toMillis(nowHours - 90  * 24),
+                     TimeUnit.HOURS.toMillis(nowHours - 365 * 24)};
 
     Map<String, long[]> platformIncrements = new HashMap<>();
     Map<String, long[]> countryIncrements  = new HashMap<>();