How to restore an expired token [AWS Cognito]?

Question

I'm using AWS for my website. After 1 hour the token expires and the user pretty much can't do anything.

For now i'm trying to refresh the credentials like this:

 function getTokens(session) {
   return {
     accessToken: session.getAccessToken().getJwtToken(),
     idToken: session.getIdToken().getJwtToken(),
     refreshToken: session.getRefreshToken().getToken()
   };
 };


function getCognitoIdentityCredentials(tokens) {
  const loginInfo = {};
  loginInfo[`cognito-idp.eu-central-1.amazonaws.com/eu-central-1_XXX`] = tokens.idToken;
  const params = {
    IdentityPoolId: AWSConfiguration.IdPoolId
    Logins: loginInfo
  };
  return new AWS.CognitoIdentityCredentials(params);
 };


 if(AWS.config.credentials.needsRefresh()) {
    clearInterval(messwerte_updaten);
    cognitoUser.refreshSession(cognitoUser.signInUserSession.refreshToken, (err, session) => {
      if (err) {
        console.log(err);
      }
      else {
        var tokens = getTokens(session);
               
        AWS.config.credentials = getCognitoIdentityCredentials(tokens);
       
        AWS.config.credentials.get(function (err) {
          if (err) {
            console.log(err);
          }
          else {
            callLambda();
          }
       });
     }
   });
 }

the thing is, after 1hour, the login token gets refreshed without a problem, but after 2hrs i can't refresh the login token anymore.

i also tried using AWS.config.credentials.get(), AWS.config.credentials.getCredentials() and AWS.config.credentials.refresh() which doesn't work either.

The error messages i'm getting are:

Missing credentials in config

Invalid login token. Token expired: 1446742058 >= 1446727732

Answer 1

After almost 2 weeks i finally solved it.

You need the Refresh Token to receive a new Id Token. Once the Refreshed Token is acquired, update the AWS.config.credentials object with the new Id Token.

here is an example on how to set this up, runs smoothly!

refresh_token = session.getRefreshToken();   // you'll get session from calling cognitoUser.getSession()

if (AWS.config.credentials.needsRefresh()) {

  cognitoUser.refreshSession(refresh_token, (err, session) => {
    if(err) {
      console.log(err);
    } 
    else {
      AWS.config.credentials.params.Logins['cognito-idp.<YOUR-REGION>.amazonaws.com/<YOUR_USER_POOL_ID>']  = session.getIdToken().getJwtToken();
      AWS.config.credentials.refresh((err)=> {
        if(err)  {
          console.log(err);
        }
        else{
          console.log("TOKEN SUCCESSFULLY UPDATED");
        }
      });
    }
  });
}

Answer 2

Usually it's solved by intercepting http requests with additional logic.

function authenticationExpiryInterceptor() {
 // check if token expired, if yes refresh
}

function authenticationHeadersInterceptor() {
 // include headers, or no
}}

then with use of HttpService layer

  return HttpService.get(url, params, opts) {
     return authenticationExpiryInterceptor(...)
            .then((...) => authenticationHeadersInterceptor(...))
            .then((...) => makeRequest(...))
  }

It could be solved by proxy as well http://2ality.com/2015/10/intercepting-method-calls.html

In relation to AWS: https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/Credentials.html

You're interested in:

• getPromise()
• refreshPromise()

Answer 3

Here is how I implemented this:

First you need to authorize the user to the service and grant permissions:

Sample request:

Here is how I implemented this:

First you need to authorize the user to the service and grant permissions:

Sample request:

POST https://mydomain.auth.us-east-1.amazoncognito.com/oauth2/token&
Content-Type='application/x-www-form-urlencoded'&
Authorization=Basic aSdxd892iujendek328uedj
grant_type=authorization_code&
client_id={your client_id}
code=AUTHORIZATION_CODE&
redirect_uri={your rediect uri}

This will return a Json something like:

HTTP/1.1 200 OK Content-Type: application/json

{"access_token":"eyJz9sdfsdfsdfsd", "refresh_token":"dn43ud8uj32nk2je","id_token":"dmcxd329ujdmkemkd349r", "token_type":"Bearer", "expires_in":3600}

Now you need to get an access token depending on your scope:

POST https://mydomain.auth.us-east-1.amazoncognito.com/oauth2/token
Content-Type='application/x-www-form-urlencoded'&
Authorization=Basic aSdxd892iujendek328uedj
grant_type=client_credentials&
scope={resourceServerIdentifier1}/{scope1} {resourceServerIdentifier2}/{scope2}

Json would be:

HTTP/1.1 200 OK Content-Type: application/json

{"access_token":"eyJz9sdfsdfsdfsd", "token_type":"Bearer", "expires_in":3600}

Now this access_token is only valid for 3600 secs, after which you need to exchange this to get a new access token. To do this,

To get new access token from refresh Token:

POST https://mydomain.auth.us-east-1.amazoncognito.com/oauth2/token >
Content-Type='application/x-www-form-urlencoded'
Authorization=Basic aSdxd892iujendek328uedj
grant_type=refresh_token&
client_id={client_id}
refresh_token=REFRESH_TOKEN

Response:

HTTP/1.1 200 OK Content-Type: application/json

{"access_token":"eyJz9sdfsdfsdfsd", "refresh_token":"dn43ud8uj32nk2je", "id_token":"dmcxd329ujdmkemkd349r","token_type":"Bearer", "expires_in":3600}

You get the picture right.

If you need more details go here.

Answer 4

This is how you can refresh access token using AWS Amplify library:

import Amplify, { Auth } from "aws-amplify";

Amplify.configure({
  Auth: {
    userPoolId: <USER_POOL_ID>,
    userPoolWebClientId: <USER_POOL_WEB_CLIENT_ID>
  }
});

try {
    const currentUser = await Auth.currentAuthenticatedUser();
    const currentSession = currentUser.signInUserSession;
    currentUser.refreshSession(currentSession.refreshToken, (err, session) => {
      // do something with the new session
    });
  } catch (e) {
    // whatever
  }
};

More discussion here: https://github.com/aws-amplify/amplify-js/issues/2560.