view.html.erb

<script type="text/javascript">
(function () {
  let date = new Date();
  date.setTime(date.getTime() + (7*24*60*60*1000));
  let expires = "expires=" + date.toUTCString();
  let cookiePath = "path=/rnode/" + "<%= host.to_s %>" + "/" + "<%= port.to_s %>/";
  /**
    rstuido wants a cookie called csrf-token - but that's going to change in 2020!
  */
  /**
    ^- ???????????
    */
  let cookie = `csrf-token=<%= csrf_token %>;${expires};${cookiePath};SameSite=strict;secure`;
  document.cookie = cookie;
})();
</script>

<form action="/rnode/<%= host %>/<%= port %>/auth-do-sign-in" method="post" target="_blank">
  <input type="hidden" name="csrf-token" value="<%= csrf_token %>"/>
  <input type="hidden" name="username" value="<%= ENV["USER"] %>">
  <input type="hidden" name="password" value="<%= password %>">
  <input type="hidden" name="staySignedIn" value="1">
  <input type="hidden" name="appUri" value="">
  <button class="btn btn-primary" type="submit">
    <i class="fa fa-registered"></i> Connect to RStudio Server
  </button>
</form>