How to Authenticate an Anaplan SSO user(SAML) in React application.

We have configured SSO for authentication in Anaplan against SAML2.0 AAD,
We have a requirement that user should be able to login to his anaplan account without entering username and password using SSO as user is already logged into machine.

We want to Authenticate Anaplan User from React Application and want to fetch details of workspace etc from user account.
Please help if any one has worked on similar requirement can help me with the documentation.