title: How to create a Custom AuthorizeAttribute that redirects?
body: <p>I want to create a custom <code>AuthorizeAttribute</code> that</p>
  
  <ol>
  <li>checks for user login.
  <ol>
  <li>if logged: redirect to place1.</li>
  <li>else: redirect to place2.</li>
  </ol></li>
  <li>checks for user activation.
  <ol>
  <li>if logged &amp;&amp; not activated: redirect to place3</li>
  </ol></li>
  </ol>
  
  <p>No clue how to do. I mean, how can I access the user info inside the attribute in order to check it?</p>