Upstream Firebase Admin Auth Policy

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.

Configuration

The configuration shows how to configure the policy in the 'policies.json' document.

config/policies.json
{
  "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
    }
  }
}

Policy Configuration

• name <string> - The name of your policy instance. This is used as a reference in your routes.
• policyType <string> - The identifier of the policy. This is used by the Zuplo UI. Value should be upstream-firebase-admin-auth-inbound.
• handler.export <string> - The name of the exported type. Value should be UpstreamFirebaseAdminAuthInboundPolicy.
• handler.module <string> - The module containing the policy. Value should be $import(@zuplo/runtime).
• handler.options <object> - The options for this policy. See Policy Options below.

Policy Options

The options for this policy are specified below. All properties are optional unless specifically marked as required.

• serviceAccountJson (required) <string> - The Google Service Account key in JSON format. Note you can load this from environment variables using the $env(ENV_VAR) syntax.
• tokenRetries <number> - The number of times to retry fetching the token in the event of a failure. Defaults to 3.
• expirationOffsetSeconds <number> - The number of seconds less than the token expiration to cache the token. Defaults to 300.

Using the Policy

Read more about how policies work