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MareSynchronosServer/MareSynchronosShared/Utils/IdBasedUserIdProvider.cs

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+using Microsoft.AspNetCore.SignalR;
+
+namespace MareSynchronosShared.Utils;
+
+public class IdBasedUserIdProvider : IUserIdProvider
+{
+    public string GetUserId(HubConnectionContext context)
+    {
+        return context.User!.Claims.SingleOrDefault(c => string.Equals(c.Type, MareClaimTypes.Uid, StringComparison.Ordinal))?.Value;
+    }
+}