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File storage and CDN. Object storage, presigned URLs, image/video processing, lifecycle policies.
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Showing SKILL.md
| name | storage |
| description | File storage and CDN. Object storage, presigned URLs, image/video processing, lifecycle policies. |
/godmode:storage, "file upload", "S3 bucket"File Types: images | docs | video | audio | archives
Max Upload Size: images <10MB, video <500MB
Storage Provider: S3 | GCS | Azure Blob | R2
CDN: CloudFront | Cloud CDN | Cloudflare
Scale: <uploads/day, total storage/year>
# Create S3 bucket with versioning
aws s3api create-bucket \
--bucket myapp-prod-uploads \
--region us-east-1
aws s3api put-bucket-versioning \
--bucket myapp-prod-uploads \
--versioning-configuration Status=Enabled
# Verify bucket policy
aws s3api get-bucket-policy --bucket myapp-prod-uploads
BUCKET STRUCTURE:
/<tenant-id>/originals/<uuid>.<ext>
/<tenant-id>/variants/<uuid>/<size>.<ext>
/<tenant-id>/thumbnails/<uuid>.webp
PROVIDER COMPARISON:
| Feature | S3 | GCS | Azure Blob |
|-------------|-------|-------|-----------|
| Max object | 5 TB | 5 TB | 190.7 TB |
| Multipart | 5 MB | 5 MB | N/A blocks|
| Consistency | Strong| Strong| Strong |
PRESIGNED URL FLOW:
Client -> API (request URL)
-> API validates type+size, generates presigned PUT
-> Client PUTs directly to S3
-> S3 event -> Worker validates/scans/resizes
-> Client gets confirmation
IF file < 10MB: single presigned PUT
IF file 10MB-5GB: multipart (5-100MB chunks,
3-5 concurrent, per-chunk retry)
IF file > 5GB or mobile: resumable (tus protocol)
WHEN server processing needed first: direct upload
PIPELINE:
Upload -> Validate (magic bytes) -> Virus Scan
-> Process (Sharp: resize, WebP/AVIF, strip EXIF)
-> Store variants -> CDN
VARIANTS:
thumbnail: 200x200 crop, 80% quality
small: 400w, 80% quality
medium: 800w, 85% quality
large: 1600w, 90% quality
placeholder: 20x20, 20% quality, base64 LQIP
LIFECYCLE POLICIES:
Incomplete multipart: abort after 24h
Transition to IA: after 90 days (40% savings)
Transition to Glacier: after 365 days (80%)
Delete old versions: after 30 days
OPTIMIZATION ACTIONS:
| Action | Savings | Effort |
|--------------------|---------|--------|
| Lifecycle to IA | 40% | Low |
| CDN (reduce egress)| 50% | Medium |
| WebP conversion | 30% | Medium |
| Deduplicate files | 15% | Medium |
Tier 1: Same-region (automatic, 11 nines S3)
Tier 2: Cross-region replication
Primary: us-east-1, Replica: eu-west-1
IF compliance requires geo-redundancy: enable
IF disaster recovery RTO < 1h: enable
Commit: "storage: <desc> -- <components>"
Files: bucket config, upload service, processing,
lifecycle policies
grep -r "aws-sdk\|@aws-sdk\|@google-cloud/storage" \
package.json 2>/dev/null
grep -r "S3Client\|getSignedUrl\|presignedUrl" \
src/ --include="*.ts" --include="*.js" -l \
2>/dev/null | head -5
Log to .godmode/storage-results.tsv:
step\tcomponent\tprovider\tstatus\tdetails
Print: Storage: {provider}. Upload: {presigned|direct}. CDN: {active|none}. Status: {DONE|PARTIAL}.
KEEP if: end-to-end upload works AND direct bucket
access blocked AND cost projection improved
DISCARD if: upload fails OR bucket exposed OR CORS
breaks. Revert on discard.
STOP when:
- End-to-end upload works (presigned -> CDN)
- Direct bucket access blocked
- Lifecycle rules active
- All credentials from env vars or IAM roles