Feature request: To be able to set custom audience in V2 functions

[SayYoungMan]

Related issues

Couldn't find any.

[REQUIRED] Version info

node: v18.16.0

firebase-functions: 4.4.0

firebase-tools: 12.0.0

firebase-admin: 11.8.0

Feature request

I am using a load balancer on top of firebase functions to direct traffics to necessary API endpoints on a single domain. However, Cloud Run's custom authentication returns 401 if I set the aud field in the token as my custom domain because the custom audience needs to be set as per the documentation here: https://cloud.google.com/run/docs/configuring/custom-audiences

Since there is no option to set custom audience in HttpsOptions, I have to manually run
gcloud beta run services update <service-name> --add-custom-audiences=https://custom.endpoint.com to add custom audiences.

It would be nicer to be able to set this when we are making firebase function itself, like:

functionsV2.https.onRequest(
    {
      memory: "1GiB",
      ingressSettings: "ALLOW_INTERNAL_AND_GCLB",
      invoker: "private",
      customAudiences: ["https://custom.endpoint.com"]
    },
    connectApp,
  )

It seems like it's supported on terraform (https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/cloud_run_service#annotations) in the form of annotations so it might be nicer to support annotations when making firebase functions V2.

[taeold]

@SayYoungMan Great feature request. There is a small amount of internal process I need to follow in order to bring new API to the SDK, so I'll get the process going.

Thank you for the suggestion!