Client Side Thunks for Token Exchange

store.js

const exchangeTokenForAuth = (history)=> {
  return (dispatch)=> {
    const token = window.localStorage.getItem('token');
    if(!token){
      return 
    }
    return axios.get('/api/auth', {
      headers: {
        authorization: token
      }
    })
    .then( response => response.data)
    .then( auth => {
      dispatch(_setAuth(auth))
      if(history){
        history.push('/users');
      }
    }) 
    .catch( ex => window.localStorage.removeItem('token'))
  }
}

const logout = ()=> {
  window.localStorage.removeItem('token');
  return _setAuth({});
}

const login = (credentials, history)=> {
  return (dispatch)=>{
    return axios.post('/api/auth', credentials)
    .then(response => response.data)
    .then( data => {
      window.localStorage.setItem('token', data.token);
      dispatch(exchangeTokenForAuth(history));
    })
  }
};