Upstream Firebase Admin Auth

This policy adds a Firebase Admin token to the outgoing Authentication header allowing requests to Firebase using Service Account admin permissions. This can be useful for calling Firebase services such as Firestore through a Zuplo endpoint that is secured with other means of Authentication such as API keys. Additionally, this policy can be useful for service content to all API users (for example serving a specific Firestore document containing configuration data)

We recommend reading the serviceAccountJson from environment variables (so it is not checked in to source control) using the $env(ENV_VAR) syntax.

{
  "name": "my-upstream-firebase-admin-auth-inbound-policy",
  "policyType": "upstream-firebase-admin-auth-inbound",
  "handler": {
    "export": "UpstreamFirebaseAdminAuthInboundPolicy",
    "module": "$import(@zuplo/runtime)",
    "options": {
      "expirationOffsetSeconds": 300,
      "serviceAccountJson": "$env(SERVICE_ACCOUNT_JSON)",
      "tokenRetries": 3
    }
  }
}