Supabase JWT Auth - Zuplo Docs

The Supabase JWT Authentication policy allows you to authenticate incoming requests using a token created by supabase.com.

When configured, you can have Zuplo check incoming requests for a JWT token and automatically populate the ZuploRequest's user property with a user object.

This user object will have a sub property - taking the sub id from the JWT token. It will also have a data property populated by other data returned in the JWT token - including all your claims, user_metadata and app_metadata.

You can also require specific claims to have specific values to allow authentication to complete, providing a layer of authorization.

Configuration

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

{
  "name": "my-supabase-jwt-auth-inbound-policy",
  "policyType": "supabase-jwt-auth-inbound",
  "handler": {
    "export": "SupabaseJwtInboundPolicy",
    "module": "$import(@zuplo/runtime)",
    "options": {
      "allowUnauthenticatedRequests": false,
      "requiredClaims": {
        "claim_1": [
          "valid_value_1",
          "valid_value_2"
        ]
      },
      "secret": "$env(SUPABASE_JWT_SECRET)"
    }
  }
}

Policy Options

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

secret <string> (Required) -
The key used to verify the signature of the JWT token.
allowUnauthenticatedRequests <boolean> -
Indicates whether the request should continue if authentication fails. Default is false which means unauthenticated users will automatically receive a 401 response.
Defaults to false.
requiredClaims <object> -
Any claims that must be present for authentication to succeed - multiple valid values can be specified for each claim.

Using the Policy

Authorization#

You can also require certain claims to be valid by specifying this in the options. For example, if you require the claim user_role to be either admin or supa_user, you would configure the policy as follows:

{
  "export": "SupabaseJwtInboundPolicy",
  "module": "$import(@zuplo/runtime)",
  "options": {
    "secret": "$env(SUPABASE_JWT_SECRET)",
    "allowUnauthenticatedRequests": false,
    "requiredClaims": {
      "user_role": ["admin", "supa_user"]
    }
  }
}