PathMask: unable to mask an array element by its index

[brenuart]

Suppose a configuration that produces the following JSON:

{
   "array": ["a", {"foo":"bar"}]
}

If you want to mask the second array entry you should configure a MaskingJsonGeneratorDecorator with a PathMask of /array/1. This should produce the following result:

{
   "array": ["a", "****"]
}

Unfortunately this doesn't work and nothing is masked. To recap the observed behaviour:

PathMask	Comment
/array	Path points to the array field whose content is entirely masked. Result: { "array": "****" }
/array/1	Path points to the second array entry BUT nothing is masked. Result: "{ array": ["a", {"foo":"bar"}] } Expected: "{ array": ["a", "****"] }
/array/1/foo	Path points to the foo property of the second entry which is masked. This shows that a path can correctly identify an array entry by its index. Result: "{ array": ["a", {"foo":"****"}] }

---

logstash-logback-encoder: 7.0.1

[denisvasconcelos]

Hi @brenuart how are you?
I got the solution passing the path like this: /array/*/foo
So my logback.xml was like below:

            <jsonGeneratorDecorator class="net.logstash.logback.mask.MaskingJsonGeneratorDecorator">

                <!-- The default mask string can optionally be specified by <defaultMask>.
                     When the default mask string is not specified, **** is used.
                -->
                <defaultMask>****</defaultMask>

                <!-- Field paths to mask added via <path> will use the default mask string -->
                <path>foo</path>
                <path>array/*/foo</path>
            </jsonGeneratorDecorator>