File upload decision guide: signed URLs, validation, storage, virus scanning, image processing, UX. Use for: upload, file storage, attachment, avatar, image, document, GCS, S3, presigned.
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See how to installReview the instructions the agent will receive before you install.
Default storage: GCS. Logic identical for S3/R2 — adapt provider SDK.
| Strategy | When | Trade-off |
|---|---|---|
| Signed URL (direct) | Default for all uploads | Backend never touches bytes; scales trivially |
| Server proxy | <100KB parsed inline (small CSV) | Simple but consumes backend RAM; no scale |
| Resumable/multipart | >100MB (videos, datasets) | 8-32MB chunks; resume on failure |
| tus protocol | Vendor-neutral resumable | Requires tusd server |
Client → POST /uploads/sign → Backend (validate, create pending row, return signed URL)
Client → PUT bytes → Storage (uploads-pending/)
Storage → Event (Pub/Sub) → Worker (MIME sniff + virus scan)
Worker → if clean: move to uploads-clean/, update DB status
Key decisions:
t/{tenant}/u/{user}/{uuid} key path| Check | Where | Detail |
|---|---|---|
| MIME whitelist | Sign + Worker (sniff) | Whitelist only; sniff first 512 bytes server-side |
| Size limit | Sign + URL constraint | Enforce per use case (10MB avatar, 100MB doc) |
| Virus scan | Worker (async) | ClamAV / Cloudmersive / VirusTotal; never serve status != clean |
| Content-Type match | Worker | Sniffed vs declared; reject on mismatch |
| Checksum | Worker (post-scan) | SHA-256 stored for integrity |
Never trust client Content-Type or file extension alone.
| Provider | When | Notes |
|---|---|---|
| GCS | Default (GCP) | V4 signed URLs, Pub/Sub, Cloud CDN |
| S3 | AWS stack | Presigned URLs, EventBridge, CloudFront |
| R2 | Egress-sensitive | S3-compatible, zero egress fees |
pending → scanning → clean | infected (deleted) | rejected (deleted)
DB columns: id, owner_id, tenant_id, bucket, key, mime, size, checksum_sha256, status, scanned_at, created_at.
upload.onprogress — fetch lacks upload progressuploadAsync100MB: switch to resumable with per-chunk retry + exponential backoff
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