Re-use Cedar JSON FFI where possible

[khieta]

Category

Internal refactors/changes

Describe the feature you'd like to request

We made a variety of improvements to the Cedar JSON FFI (cedar-policy::ffi) as part of version 4.0. For example: we added APIs to check whether a policy/schema successfully parse (cedar-policy/cedar#1079), to apply the formatter to policies (cedar-policy/cedar#1087), and to convert between the JSON and Cedar syntaxes for policies and schemas (cedar-policy/cedar#1087).

The Java-Rust interface in CedarJavaFFI should reuse these FFI APIs as much as possible. For example: #172 and #180 could probably be revised to use the corresponding cedar-policy::ffi functions instead.

Describe alternatives you've considered

No response

Additional context

No response

Is this something that you'd be interested in working on?

• 👋 I may be able to implement this feature request
• ⚠️ This feature might incur a breaking change

[marisadiaz10]

Hi team! We currently use the schema in JSON format and would like to move to the Cedar format, so having the schema conversion functions mentioned in this issue would be very helpful! thank you!

Extra context from slack thread:

we want to switch our schema to Cedar format to reduce verbosity (since our schema is large), but we need to pass some of the entities defined in the schema to isAuthorized() , so we need a way to access those entities directly from the Cedar format or a way to convert the schema to JSON so we access them with custom logic (this is what we do rn).