GoSƐ

GoSƐ is a modern file uploader designed to scale horizontally by keeping all state in an S3-compatible object storage backend. Uploads and downloads are performed directly against S3 using pre-signed requests, reducing application bandwidth and server load.

Key Features

• S3-compatible backend with no separate database or cache required
• Direct-to-S3 uploads and downloads via pre-signed URLs
• Chunked uploads with browser-side MD5 hashing for content-based deduplication
• Resumable uploads using S3 multi-part uploads (skips already-uploaded chunks)
• User-selectable retention/expiration per upload via S3 lifecycle policies
• Multiple preconfigured buckets/endpoints selectable by users
• Drag-and-drop upload UI with detailed progress, stats, and transfer-speed chart
• Optional notifications (browser, email, and shoutrrr integrations)
• Simple deployment as a single binary or container image

Use Cases

• Large file delivery portals backed by S3/MinIO/Ceph without proxying traffic through the app
• Sharing datasets or build artifacts where resumable uploads are important
• Lightweight upload frontends for object storage with retention policies

Limitations and Considerations

• Currently supports only a single concurrent upload of a single file
• Requires an S3-compatible backend and appropriate CORS/lifecycle feature support for full functionality

GoSƐ is a good fit when you want a simple, low-ops upload service that scales by relying on object storage primitives. Its direct-to-S3 approach minimizes server bandwidth while providing resumable uploads and deduplication for efficient transfers.