Provide a custom localContext before each request

[jh12z]

Hi, I'm trying to populate the localContext inside the graphql.ExecutionInput instance to provide some security context before each web request. Ideally I would have access to the HttpServletRequest so I can recreate the security context and pass it on inside the localContext.
Then I'll be able to retrieve it from the DataFetchingEnvironment inside my DataFetchers.

Does anybody know how to achieve that?
I'm looking around the GraphQLInvocationInput but it seems the GraphQLSingleInvocationInput doesn't support it.