Eliminate noisy directory feedback

We observed IOExceptions loading the Contact Discovery IAS KeyStore. We will now throw an AssertionError upon any error
creating the IAS KeyStore, matching the behaviour for creation of the TrustStore used for the main Signal Service. NB: If
this assertion is hit, the user will not even be able to refresh their contacts with the old directory service.

src/org/thoughtcrime/securesms/util/DirectoryHelper.java

@@ -42,6 +42,7 @@ import org.whispersystems.libsignal.util.guava.Optional;
 import org.whispersystems.signalservice.api.SignalServiceAccountManager;
 import org.whispersystems.signalservice.api.push.ContactTokenDetails;
 import org.whispersystems.signalservice.api.push.TrustStore;
+import org.whispersystems.signalservice.api.push.exceptions.NonSuccessfulResponseCodeException;
 import org.whispersystems.signalservice.api.push.exceptions.PushNetworkException;
 import org.whispersystems.signalservice.internal.contacts.crypto.Quote;
 import org.whispersystems.signalservice.internal.contacts.crypto.UnauthenticatedQuoteException;
@@ -364,10 +365,11 @@ public class DirectoryHelper {
     Set<String>               sanitizedNumbers = sanitizeNumbers(eligibleContactNumbers);
     List<Set<String>>         batches          = splitIntoBatches(sanitizedNumbers, CONTACT_DISCOVERY_BATCH_SIZE);
     List<Future<Set<String>>> futures          = new ArrayList<>(batches.size());
+    KeyStore                  iasKeyStore      = getIasKeyStore(context);
 
     for (Set<String> batch : batches) {
       Future<Set<String>> future = SignalExecutors.IO.submit(() -> {
-        return new HashSet<>(accountManager.getRegisteredUsers(getIasKeyStore(context), batch, BuildConfig.MRENCLAVE));
+        return new HashSet<>(accountManager.getRegisteredUsers(iasKeyStore, batch, BuildConfig.MRENCLAVE));
       });
       futures.add(future);
     }
@@ -414,6 +416,9 @@ public class DirectoryHelper {
       } else if (e.getCause() instanceof PushNetworkException) {
         Log.w(TAG, "Failed due to poor network.", e);
         return Optional.absent();
+      } else if (e.getCause() instanceof NonSuccessfulResponseCodeException) {
+        Log.w(TAG, "Failed due to non successful response code.", e);
+        return Optional.absent();
       } else {
         Log.w(TAG, "Failed for an unknown reason.", e);
         accountManager.reportContactDiscoveryServiceUnexpectedError(buildErrorReason(e.getCause()));
@@ -432,15 +437,17 @@ public class DirectoryHelper {
            e instanceof Quote.InvalidQuoteFormatException;
   }
 
-  private static KeyStore getIasKeyStore(@NonNull Context context)
-      throws CertificateException, NoSuchAlgorithmException, IOException, KeyStoreException
-  {
-    TrustStore contactTrustStore = new IasTrustStore(context);
+  private static KeyStore getIasKeyStore(@NonNull Context context) {
+    try {
+      TrustStore contactTrustStore = new IasTrustStore(context);
 
-    KeyStore keyStore = KeyStore.getInstance("BKS");
-    keyStore.load(contactTrustStore.getKeyStoreInputStream(), contactTrustStore.getKeyStorePassword().toCharArray());
+      KeyStore keyStore = KeyStore.getInstance("BKS");
+      keyStore.load(contactTrustStore.getKeyStoreInputStream(), contactTrustStore.getKeyStorePassword().toCharArray());
 
-    return keyStore;
+      return keyStore;
+    } catch (KeyStoreException | CertificateException | IOException | NoSuchAlgorithmException e) {
+      throw new AssertionError(e);
+    }
   }
 
   private static String buildErrorReason(@Nullable Throwable t) {