Parsing error when loading authorization model that contains indirect relations

[wkerckho]

I'm currently evaluating OpenFGA integration into Quarkus using this library. For testing, I am relying on the dev service with the config option for initializing an authorization model quarkus.openfga.devservices.authorization-model. Whenever I'm trying to load a model that contains indirect relations (e.g. https://openfga.dev/docs/modeling/roles-and-permissions#02-adding-permissions-for-bookings), the DevServicesOpenFGAProcessor cannot complete successfully due to an error while parsing the model.

I've quickly setup a reproducer repository at https://github.com/wkerckho/openfga-parsing-issue-reproducer

• TestTripResource fails during initialization of the dev service (as described above).
• TestTypeDefinitionsParsing directly tries to parse JSON authorization models into the TypeDefinitions class. This succeeds for a model only containing direct relations, but fails when indirect relations are defined.

[wkerckho]

The exception is caused by the non-null check on the parameter object in the ObjectRelation constructor.

Note that I have been testing with authorization model JSON copied from the official docs or converted from DSL via the OpenFGA playground UI (where a computedUserset only includes the relation attribute). The Swagger API documentation on the other hand, uses an empty object attribute in the JSON value for computedUserSet (see: https://openfga.dev/api/service#/Authorization%20Models/WriteAuthorizationModel).

Is it correct to assume that:

{
  "computedUserset":{
    "relation":"writer"
  }
}

equals:

{
  "computedUserset":{
    "object":"",
    "relation":"writer"
  }
}

from a semantical point-of-view?