title: grails redirect after successful login
body: <p>I'm currently building a web shop (which is supposed to support multi tenancy).</p>
  
  <p>So my approach is to have a url setup like</p>
  
  <p>appName/shops/shop1/controller/action
  appName/shops/shop2/controller/action</p>
  
  <p>Depending on the shop (shop1 or shop2) I have a different assortment. Then I have a list with items and a button to add them to the shopping cart. This action is secured an only accessible for logged in users.</p>
  
  <p>My Problem is the following:
  Default behaviour when clicking the "secured" button is to get redirected to appName/login/auth. This way I'm losing context of the shop that the user was browsing. I'm not sure if I can provide the context/shop to the auth process in a way that I can redirect to the respective shop after a successfull log in.</p>
  
  <p>Another approach would be to provide a custom button instead that redirects to the login page if the user is not logged in which provides the context/shop name.</p>