[BUG][python-fastapi] API route handler does not pass OAuth2 TokenModel to implementation

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

OpenAPI Generator's generated Python-FastAPI code works by your implementation subclassing a base API module, and then the generated router module (ie: apis/pet_api.py) calls one of the subclasses of a base API module (ie: apis/pet_api_base.py).

The generated router method a reference to a TokenModel (token_petstore_auth), but this is attribute is never passed to the subclass add_pet() implementation:

https://github.com/OpenAPITools/openapi-generator/blob/98cd9bd80399c2ce235f4b087e005741fe07bdf3/samples/server/petstore/python-fastapi/src/openapi_server/apis/pet_api.py#L50-L59

That code is generated here, where there is no reference to {{#authMethods}} in the method body, only {{#allParams}}:

https://github.com/OpenAPITools/openapi-generator/blob/98cd9bd80399c2ce235f4b087e005741fe07bdf3/modules/openapi-generator/src/main/resources/python-fastapi/api.mustache#L62-L71

And the TokenModel doesn't appear in the base API module (ie: apis/pet_api_base.py):

https://github.com/OpenAPITools/openapi-generator/blob/98cd9bd80399c2ce235f4b087e005741fe07bdf3/samples/server/petstore/python-fastapi/src/openapi_server/apis/pet_api_base.py#L15-L23

That code is generated here, where there is no reference to {{#authMethods}} at all:

https://github.com/OpenAPITools/openapi-generator/blob/98cd9bd80399c2ce235f4b087e005741fe07bdf3/modules/openapi-generator/src/main/resources/python-fastapi/base_api.mustache#L17-L23

As a result, it is impossible to use the validated information from the OAuth token in your implementation.

Expected behaviour

The base API should include the TokenModel:

class BasePetApi:
    # ...
    async def add_pet(
        self,
        pet: Annotated[Pet, Field(description="Pet object that needs to be added to the store")],
        token_petstore_auth: TokenModel = Security(
            get_token_petstore_auth, scopes=["write:pets", "read:pets"]
        ),
    ) -> Pet:
        """"""
        ...

The generated router method should pass on the TokenModel:

# ...
async def add_pet(
    pet: Annotated[Pet, Field(description="Pet object that needs to be added to the store")] = Body(None, description="Pet object that needs to be added to the store"),
    token_petstore_auth: TokenModel = Security(
        get_token_petstore_auth, scopes=["write:pets", "read:pets"]
    ),
) -> Pet:
    """"""
    if not BasePetApi.subclasses:
        raise HTTPException(status_code=500, detail="Not implemented")
    return await BasePetApi.subclasses[0]().add_pet(pet, token_petstore_auth)

That way, your implementation can use the token with something like:

class PetApiImpl(BasePetApi):
    # ...
    async def add_pet(self, pet: Pet, token_petstore_auth: TokenModel):
        database.Pet.objects.create(creator=token_petstore_auth.sub, pet=pet)

openapi-generator version

7.9.0

OpenAPI declaration file content or url

https://github.com/OpenAPITools/openapi-generator/blob/98cd9bd80399c2ce235f4b087e005741fe07bdf3/samples/server/petstore/python-fastapi/openapi.yaml#L23-L47

Generation Details

Sample is included with OpenAPI Generator:

./bin/generate-samples.sh ./bin/configs/*.yaml

Steps to reproduce

Related issues/PRs

Suggest a fix

Start with modules/openapi-generator/src/main/resources/python-fastapi/api.mustache and base_api.mustache, then compare their output with the Petstore sample files under samples/server/petstore/python-fastapi. Run ./bin/generate-samples.sh ./bin/configs/*.yaml and verify that authenticated generated methods expose the TokenModel and pass it to the implementation.