NLog structuring logging masking

Question

Suppose we are writing the following structured log message

logger.Info("User's Password is {Password}", "1234567890");

I would like to mask a password property because it is a sensitive data. I found this issue but I think it is a very difficult way.

For example, I have found the extension that resolves a similar task for serilog. It is very simple to use. But I didn't find any useful information for Nlog.

How to achieve it with nlog library? I will appreciate any suggestions.

Answer 1

You could use RegisterObjectTransformation, introduced in NLog 4.7.

For example:

LogManager.Setup().SetupSerialization(s => 
    s.RegisterObjectTransformation<object>(o =>
    {
        var props = o.GetType().GetProperties();
        var propsDict = props.ToDictionary(p => p.Name, p => p.GetValue(o));

        propsDict.Remove("password");

        return propsDict;
   }));

Please note, in terms of performance you maybe need something like a reflection cache and smart optimizations.