Update backoff logic of ClearFallbackKbsEnclaveJob.

app/src/main/java/org/thoughtcrime/securesms/jobs/ClearFallbackKbsEnclaveJob.java

@@ -10,6 +10,7 @@ import org.thoughtcrime.securesms.jobmanager.Job;
 import org.thoughtcrime.securesms.jobmanager.JobManager;
 import org.thoughtcrime.securesms.jobmanager.impl.NetworkConstraint;
 import org.thoughtcrime.securesms.pin.KbsEnclaves;
+import org.whispersystems.signalservice.api.push.exceptions.NonSuccessfulResponseCodeException;
 import org.whispersystems.signalservice.internal.contacts.crypto.UnauthenticatedResponseException;
 
 import java.io.IOException;
@@ -80,12 +81,30 @@ public class ClearFallbackKbsEnclaveJob extends BaseJob {
 
   @Override
   public boolean onShouldRetry(@NonNull Exception e) {
+    if (e instanceof NonSuccessfulResponseCodeException) {
+      switch (((NonSuccessfulResponseCodeException) e).getCode()) {
+        case 404:
+          return getRunAttempt() < 3;
+        case 508:
+          return false;
+      }
+    }
+
     return true;
   }
 
+  @Override
+  public long getNextRunAttemptBackoff(int pastAttemptCount, @NonNull Exception e) {
+    if (e instanceof NonSuccessfulResponseCodeException && ((NonSuccessfulResponseCodeException) e).getCode() == 404) {
+      return TimeUnit.DAYS.toMillis(1);
+    } else {
+      return super.getNextRunAttemptBackoff(pastAttemptCount, e);
+    }
+  }
+
   @Override
   public void onFailure() {
-    throw new AssertionError("This job should never fail. " + getClass().getSimpleName());
+    Log.w(TAG, "Job failed! It is likely that the old enclave is offline.");
   }
 
   public static class Factory implements Job.Factory<ClearFallbackKbsEnclaveJob> {