Option to pass only part of the JWT payload to upstreams

[dotansimha]

Based on the feedback from a user:

Hi, in Hive Router you can configure it to forward claims. From reading the documentation I thought you could forward a particular claim from the JWT, but it seems that all claims in the JWT payload get sent upstream just under the name I give in field_name.
Can you confirm it sends the entire JWT payload and that I cannot just send 1 claim from the JWT payload?

[dotansimha]

To accomodate this change, I think maybe we can allow to pass an allow list of fields to pass? This way we keep the claims as object, and only part of the fields are passed?

jwt:
  require_authentication: true
  jwks_providers:
    - source: remote
      url: https://your-domain.auth0.com/.well-known/jwks.json
 
  # Send user info to subgraphs
  forward_claims_to_upstream_extensions:
    enabled: true
    field_name: 'user' # Access as extensions.user in subgraphs
    filter_claims:
      - sub
      - user_role