cognito.js

// load this script first: <script src="https://apis.google.com/js/api.js?onload=init"></script>

gapi.load('auth2', function() {
    googleAuth = gapi.auth2.init({client_id: '<your-google-api-key>.apps.googleusercontent.com'})
    googleAuth.signIn({'scope': 'profile email'})
})

// this is a-sync, you should wait till you get the googleAuth object before continueing.

AWS.config.region = 'eu-west-1'
AWS.config.id_token = id_token
AWS.config.credentials = new AWS.CognitoIdentityCredentials({
  IdentityPoolId: 'eu-west-1:c3d1617c-fc6e-4983-a867-6faaade8ddc7',
  Logins: { // optional tokens, used for authenticated login
    'accounts.google.com': googleAuth.id_token
  }
})

AWS.config.credentials.get(err => {
  if (err) {
    console.log('Error: ' + err)
  } else {
    console.log('access key id', AWS.config.credentials.accessKeyId)
    console.log('secret access key', AWS.config.credentials.secretAccessKey)
    console.log('session token', AWS.config.credentials.sessionToken)
    
    // you can now use these keys to call the api gateway using the generated JS SDK for your AWS Gateway API.
  }
}