title: R/shiny user registration/authentication
body: <p>I'm looking for a user registration/log in code template for r/shiny. It need not be secure, just a way to personalize the content on a shiny app based on previous user settings. I don't want to rely too much on server services (such as accessing cookies)</p>
  
  <p>I wonder if there is something out there, or whether there are any suggestions about how to implement it.</p>
  
  <p>So far I've been trying to do it myself, using a set of reactive variables (other than the input/output) on the client side, that remember the state of the session. The code became a bit ugly and I wonder if there is something simpler that I can reuse.</p>
  
  <p>A link to a working example would be great as well :)</p>
  
  <p>Thanks.</p>