fix: limit joined_at to seconds up to 01/01/2100

Author: Bilb

package.json

@@ -2,7 +2,7 @@
   "main": "index.js",
   "name": "libsession_util_nodejs",
   "description": "Wrappers for the Session Util Library",
-  "version": "0.4.7",
+  "version": "0.4.8",
   "license": "GPL-3.0",
   "author": {
     "name": "Oxen Project",

src/user_groups_config.cpp

@@ -314,6 +314,10 @@ Napi::Value UserGroupsWrapper::setGroup(const Napi::CallbackInfo& info) {
                     obj.Get("joinedAtSeconds"), "UserGroupsWrapper::setGroup joinedAtSeconds")) {
             group_info.joined_at = *joinedAtSeconds;
         }
+        // 1st Jan 2100. Probably an invalid timestamp.
+        if (group_info.joined_at > 4099680000) {
+            throw std::invalid_argument{"group.joined_at is too far in the future"};
+        }
 
         if (auto invited = maybeNonemptyBoolean(
                     obj.Get("invitePending"), "UserGroupsWrapper::setGroup invitePending")) {