From 6f916652ebb506806c42d08c76148ff28ebfca6c Mon Sep 17 00:00:00 2001
From: Camila Ayres <hello@camilasan.com>
Date: Mon, 14 Oct 2024 16:36:38 +0200
Subject: [PATCH] Fail with error before calling folder metada setup when
 received empty signature.

Signed-off-by: Camila Ayres <hello@camilasan.com>
---
 src/libsync/discoveryphase.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/libsync/discoveryphase.cpp b/src/libsync/discoveryphase.cpp
index 02722ceedac9b..b6b383e3c9ae6 100644
--- a/src/libsync/discoveryphase.cpp
+++ b/src/libsync/discoveryphase.cpp
@@ -697,6 +697,14 @@ void DiscoverySingleDirectoryJob::metadataReceived(const QJsonDocument &json, in
         }
     }
 
+    if (job->signature().isEmpty()) {
+        qCDebug(lcDiscovery) << "Initial signature is empty.";
+        _account->reportClientStatus(OCC::ClientStatusReportingStatus::E2EeError_GeneralError);
+        emit finished(HttpError{0, tr("Encrypted metadata setup error: initial signature from server is empty.")});
+        deleteLater();
+        return;
+    }
+
     const auto e2EeFolderMetadata = new FolderMetadata(_account,
                                                  _remoteRootFolderPath,
                                                  statusCode == 404 ? QByteArray{} : json.toJson(QJsonDocument::Compact),