title: User Specific Folder access to S3
body: <p>I have an application where users upload their documents-(let's say some of the documents are sensitive documents like ID Proofs). My S3 bucket structure is such that each user has its own folder inside which his/her documents are saved.</p>
  <p>The application runs on the MEAN stack.</p>
  <p>As of now the bucket is public. (Sensitive Documents uploading is a future addition).</p>
  <p>I want the logged in user to be able to access only his/her documents. Also, the document URL should be secured. (Pre-Signed URL maybe)</p>
  <p>What should be my approach for the above requirement? Any code resources/docs etc..?</p>