WeTransfer

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Build me a large-file transfer service on object storage, with links that expire.

STACK
- Node with Fastify, SQLite for metadata
- S3-compatible object storage; the app server never handles the file bytes

UPLOAD
- Presigned multipart upload straight to storage, initiated by the server
- Resume a partial upload after a dropped connection by listing completed parts
- Record checksum, size and content type; verify the size on completion

THE LINK
- A signed id with 128 bits of entropy — never sequential, never guessable
- Optional password: store a hash, and require it before issuing the download URL
- Expiry in days, enforced by a lifecycle rule on the bucket as well as in the database, so an expired file is really gone

DOWNLOAD
- Issue a short-lived presigned URL per download; never proxy the file through your server
- Count downloads, and enforce a maximum if one is set

ABUSE, WHICH YOU ARE NOW RESPONSIBLE FOR
- Rate limit uploads per IP hash
- A takedown endpoint and a documented process
- Scan uploads with ClamAV before the link becomes active, and hold the file if it fails

NOTIFICATIONS
- Email the sender on first download, and the recipient when the link is about to expire

Include a README on the bucket lifecycle rules, the egress cost per hundred gigabytes, and the abuse process.