Example for listening for the `action.SHOW_SIGNIN_DIALOG` event to trigger a client side redirect to an external auth source.

example.html

<div id='coralStreamEmbed'></div>
<script src="https://url.for.talk.com/static/embed.js"></script>
<script>
  function attachToEvents(events) {
    events.on('action.SHOW_SIGNIN_DIALOG', function() {
      window.href = "https://url.for.logging.user.in.com/";
    });
  }
  
  Coral.Talk.render(document.getElementById('coralStreamEmbed'), {
    talk: 'https://url.for.talk.com/',
    events: attachToEvents,
    auth_token: 'maybe your user\'s auth token?',
  });
</script>