How to Expose Custom S3 File Upload Hook as External API?

Frappe Framework
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Hi everyone,

I’ve overridden the file upload hook in Frappe to upload files directly to S3, and it’s working perfectly within the Frappe UI.

Now, I want to expose this functionality as an external API so that third-party apps (like a mobile or frontend app) can also upload files directly to S3 using the same logic.

What’s the best way to do this in Frappe?

  • Should I create a custom whitelisted method that accepts the file and reuses the same logic as the hook?
  • Is there a way to expose the same hook logic via a REST endpoint?
  • How do I handle the file stream or base64 from an external client in this context?

Any guidance or example implementations would be appreciated!

Thanks in advance!