How do I configure Amplify to to use multiple AppSync endpoints?

Question

I need to support authenticated and unauthenticated AppSync requests in a React Native app. Since AppSync only allows one authorization type per API, I am setting up two APIs: one for authenticated users (Cognito User Pools), and one for guests (API Key).

I think to make this work I need to have two distinct AWSAppSyncClient configs in the same app.

  // authenticated user    
  const appSyncAuthenticatedClient = new AWSAppSyncClient({
    url: Config.APPSYNC_AUTHENTICATED_ENDPOINT,
    region: Config.APPSYNC_REGION,
    auth: {
      type: 'AMAZON_COGNITO_USER_POOLS',
      jwtToken: async () =>
        (await Auth.currentSession()).getAccessToken().getJwtToken()
    }
  });

  // guest    
  const appSyncUnauthenticatedClient = new AWSAppSyncClient({
    url: Config.APPSYNC_UNAUTHENTICATED_ENDPOINT,
    region: Config.APPSYNC_REGION,
    auth: {
      type: 'API_KEY',
      apiKey: Config.APPSYNC_API_ID
    }
  });

and then determine which to use based on whether or not they are logged in

    Auth.currentAuthenticatedUser()
      .then(user => this.appSyncRunningClient = appSyncAuthenticatedClient)
      .catch(err => this.appSyncRunningClient = appSyncUnauthenticatedClient);

    const App = props => {
      return (
        <ApolloProvider client={this.appSyncRunningClient}>
          <Rehydrated>
              <RootStack/>
            </Root>
          </Rehydrated>
        </ApolloProvider>
      );
    };

    export default App;

This fails because currentAuthenticatedUser returns a promise, and I'm stuck at how to resolve a promise at this top level instantiation of the app. I'll also need to swap out this config during auth events.

In what way can I dynamically select and change the ApolloProvider config at startup and authentication events?

Answer 1

This is currently not possible. Until top-level await is officially supported you should create two Apollo clients one for the API and one for the Cognito.

for example: in your App.js

export default function App(props) {
  const [client, setClient] = useState(null);

  useEffect(() => {
   checkAuth()
  }, []);

  function checkAuth() {
    Auth.currentSession().then(session => {
      const token = session.getIdToken();
      const jwtToken = token.getJwtToken();
      if (typeof jwtToken == "string") {
        const authClientConfig = {
          url: awsmobile.aws_appsync_graphqlEndpoint,
          region: awsmobile.aws_appsync_region,
          disableOffline: true,
          auth: {
            type: AUTH_TYPE.AMAZON_COGNITO_USER_POOLS,
            jwtToken: jwtToken
          }
        }
        const link = ApolloLink.from([createAuthLink(authClientConfig), createSubscriptionHandshakeLink(authClientConfig)]);
        const authClient = new ApolloClient({ link, cache: new InMemoryCache({ addTypename: false }) });
        setClient(authClient);
      } else {
        throw "error";
      }
    }).catch(e => {
      console.log(e);
      const config = {
        url: awsmobile.aws_appsync_graphqlEndpoint,
        region: awsmobile.aws_appsync_region,
        disableOffline: true,
        auth: {
          type: AUTH_TYPE.API_KEY,
          apiKey: awsmobile.aws_appsync_apiKey
        }
      }
      const link = ApolloLink.from([createAuthLink(config), createSubscriptionHandshakeLink(config)]);
      const authClient = new ApolloClient({ link, cache: new InMemoryCache({ addTypename: false }) });
        setClient(authClient);
    })
  }

    if (!client) {
      return "Loading..."
    }

    return (
      <ApolloProvider client={client}>
          ...
      </ApolloProvider>
    );
}`