JWT Authentication/Authorization with a Rhai script to normalize non-standard authorizations

This repository demonstrates how to use JWT authentication in the Router with the @requiresScopes directive when the JWT does not use the standard scope JWT claim. In this example, it is instead stored as an array of strings on the authorizations property of the JWT. The Rhai script in this repo converts it to the format expected by the Router.

Running the Example

Note: To run this example, you will need a GraphOS Enterprise plan and must create /router/.env based on /router/.env.example which exports APOLLO_KEY and APOLLO_GRAPH_REF.

1. Run the subgraph from the /subgraph directory with npm run dev
2. Run the auth-service from the /auth-service directory with npm run dev
3. In the /router directory, download the router by running ./download_router.sh
4. In the /router directory, compose the schema by running ./create_local_schema.sh
5. In the /router directory, run the router by running ./start_router.sh

Before you can query the router from the browser (http://127.0.0.1:4000/), you will need to get a JWT. This can be done by opening http://localhost:3005/login in the browser and using the resulting token as a Bearer token in the Authorization header.

Code Highlights

Router Configuration

In router/router-config.yaml:

• authorization directives are enabled
• require_authentication is set to true which enforces every request must contain a valid JWT
• A jwks url is configured to validate incoming JWTs
• The rhai property is configured to point to the rhai/main.rhai file

In subgraph/src/schema/Query.graphql, the @requiresScopes is set on fields to require specific scopes. If you query for hello you will get a result whereas hello2 will result n an error due to the JWT not containing that scope.

In router/rhai/normalize_scopes.rhai, the script takes the authorizations property as an array of strings (E.g. ["read:hello", "read:otherthing"]) and converts it to a space-separated string scope property (E.g. "read:hello read:otherthing").