AWS S3 multipart uploads from unauthenticated users? presigned URLs (😕) vs federation tokens (😃)

I had a very interesting use case lately: being able to upload a file to S3 without being signed in to AWS and taking advantage of multipart uploads (large files) in Python. This made me dig deeper into AWS presigned URLs, and multipart uploads. And the fun part is, the final solution doesn't use any of it! Curious? Read on!

• The use case


• 
  Attempt 1: REST + presigned URLs 😕
  
  
  
  
  • A simple PUT with a presigned URL
  
  
  • Multipart …

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