In this post we focus on the API layer of our object store. All layers till now were just concerened about storing the input file together with some file-format specific transforms (like generating thumbnails). It is at the API layer where we will be storing per-file system and user metadata. This metadata can be used to support application specific business logic and security policies.

https://nitingupta.dev/post/a-layered-object-store-design-in-elixir-part4/