[jira] [Created] (LOG4J2-3343) Add ability to use exclusion pattern filter on Map Resolver keys

["Matt Sicker (Jira)" <ji...@apache.org>]

Matt Sicker created LOG4J2-3343:
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             Summary: Add ability to use exclusion pattern filter on Map Resolver keys
                 Key: LOG4J2-3343
                 URL: https://issues.apache.org/jira/browse/LOG4J2-3343
             Project: Log4j 2
          Issue Type: New Feature
          Components: JsonTemplateLayout
            Reporter: Matt Sicker


Map Resolver currently supports specifying a pattern to filter for allowed keys in the map being resolved. I'd like a complementary feature to specify a pattern to filter for excluded keys from the map being resolved. It may also be beneficial to provide a similar option for excluded keys as full string matches rather than always using a pattern.

For an example use case, suppose I copy request HTTP header names and values into the ThreadContext for every request. In Spinnaker microservices, this includes custom headers like {{X-Spinnaker-Groups}} which contains a list of groups the authenticated user belongs to which are filled in by the Fiat microservice (used for integrating authentication and authorization with various providers and providing a facade over Spring Security). If I want to exclude this header from being logged, I can currently set a negative lookahead pattern like {{(?i(?!x-spinnaker-groups))}} which works effectively the same, but how many developers like reading regex incantations like these?



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