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Frontend Implementation

Authentication / Authorization

The frontend uses the Auth.js @auth/sveltekit library for for authentication and authorization.

  • a single Keycloak provider is used
  • the env vars AUTH_CLIENT_ID, AUTH_CLIENT_SECRET, AUTH_ISSUER and AUTH_SECRET are used as config
  • the authorization code flow is used
  • at sign-in the access token and refresh token are stored in a secure, HTTP only, encrypted JWT session cookie
    • nobody can access the tokens in the session cookie, because it is encrypted and only the server-side of the frontend has the secret
  • the session cookie is transferred for every request (the frontend is stateless)
  • the access token will be refreshed via the refresh token if possible
  • the session will expire at the same time as the last successful refreshed access token will expire