fix e2ee connection options defaults for proto

Author: stephen-derosa

src/ffi_client.cpp

@@ -328,7 +328,20 @@ std::future<proto::ConnectCallback> FfiClient::connectAsync(const std::string& u
 
     auto* enc = opts->mutable_encryption();
     enc->set_encryption_type(static_cast<proto::EncryptionType>(e2ee.encryption_type));
-    enc->mutable_key_provider_options()->CopyFrom(toProto(kpo));
+    auto* kp = enc->mutable_key_provider_options();
+    // shared_key is optional. If not set, leave the field unset/cleared.
+    if (kpo.shared_key && !kpo.shared_key->empty()) {
+      kp->set_shared_key(bytesToString(*kpo.shared_key));
+    } else {
+      kp->clear_shared_key();
+    }
+
+    const auto ratchet_salt = kpo.ratchet_salt.empty() ? defaultRatchetSalt() : kpo.ratchet_salt;
+    kp->set_ratchet_window_size(kpo.ratchet_window_size);
+    kp->set_ratchet_salt(bytesToString(ratchet_salt));
+    kp->set_failure_tolerance(kpo.failure_tolerance);
+    kp->set_key_ring_size(kDefaultKeyRingSize);
+    kp->set_key_derivation_function(kDefaultKeyDerivationFunction);
   }
 
   // --- RTC configuration (optional) ---