gistfile1.js

function unfinishedOrderLookup( orderId ) {
  return request.server.methods.callApi("/orders/" + orderId ).then(function(res ) {
      return res.order;
  });
}

function lookupOrdersByUid( uid ) {
  return request.server.methods.callApi("/users/" + uid + "/orders?status=0");
}

function lookUpOrder() {
  var user;
  
  return fetchUser()
        .then( function( _user) {
          user = _user;
          
            // Expose unfinished order
            var unfOrder = { quantity: 0 },
                uid = user.id !== undefined ? user.id : 0;
 
            if ( uid ) {
                return lookupOrdersByUid( uid ).then( function(res) {
                    if ( res.orders.length ) {
                        return res.orders[ 0 ];
                    }
                    
                    return unfOrder;
                });
            }
            // Unfinished order lookup
            // Legacy drupal cookie
            if (request.state.hasOwnProperty('orderId')) {
                return unfinishedOrderLookup( request.state.orderId );
            }
 
            return unfOrder;
        }).then(function( order ) {
          return [ user, order ];
        });
}