title: how to handle s3 browser-based uploads?
body: <p>There is a website, and we want to allow users to upload files for their entities.</p>
  
  <p>We managed to make a form which uploads files to s3 directly from browser.</p>
  
  <p>However, it is not very reliable for at least two reasons:</p>
  
  <ul>
  <li>apart from post-upload redirects, there does not seem to be a way to notify our application about uploaded files</li>
  <li>user can upload anything he wants, with whatever names he wants, and we should have something like a "janitor" to remove junk</li>
  </ul>
  
  <p>What's your strategy with dealing with such files? Or we should just give up and upload to s3 from our web application?</p>