Utopia-Canteen-System/Services/Logging/LogMasking.cs

namespace UtopiaCanteenSystem.Services.Logging;

public static class LogMasking
{
    public static string MaskCardId(string? cardId)
    {
        if (string.IsNullOrWhiteSpace(cardId))
            return "(empty)";

        var s = cardId.Trim();
        if (s.Length <= 4)
            return new string('*', s.Length);

        var visible = Math.Min(4, s.Length);
        return s[..visible] + new string('*', s.Length - visible);
    }

    public static string MaskConnectionString(string? connectionString)
    {
        if (string.IsNullOrWhiteSpace(connectionString))
            return "(not configured)";

        var s = connectionString.Trim();
        if (s.Length <= 20)
            return "***";

        return s[..12] + "***" + s[^4..];
    }
}