---
phase: 17-object-storage
plan: 01
subsystem: infra
tags: [s3, minio, aws-sdk, object-storage, docker, presigned-urls]

# Dependency graph
requires: []
provides:
  - "S3 storage service (uploadImage, deleteImage, getImageUrl, withImageUrl, withImageUrls)"
  - "MinIO in Docker Compose (dev and prod) with automatic bucket creation"
  - "S3 environment variable configuration"
affects: [17-02, 17-03, image-routes, image-service, mcp-tools]

# Tech tracking
tech-stack:
  added: ["@aws-sdk/client-s3@3.1024.0", "@aws-sdk/s3-request-presigner@3.1024.0", "MinIO (quay.io/minio/minio:RELEASE.2025-09-07T16-13-09Z)"]
  patterns: ["S3Client singleton with forcePathStyle", "Presigned URL injection via withImageUrl/withImageUrls helpers", "Docker Compose init container for bucket creation"]

key-files:
  created: ["src/server/services/storage.service.ts", "tests/services/storage.service.test.ts"]
  modified: ["docker-compose.yml", "docker-compose.dev.yml", ".env.example"]

key-decisions:
  - "Private bucket with presigned URLs (1h default, configurable via S3_PRESIGN_EXPIRY)"
  - "MinIO pinned to quay.io RELEASE.2025-09-07T16-13-09Z (last stable before archival)"
  - "No console port exposed in production compose"

patterns-established:
  - "S3 storage functions are pure async functions, no HTTP awareness"
  - "withImageUrl/withImageUrls helpers enrich records with presigned imageUrl field"
  - "Docker init container pattern using mc CLI for bucket setup"

requirements-completed: [IMG-01, IMG-04]

# Metrics
duration: 2min
completed: 2026-04-05
---

# Phase 17 Plan 01: S3 Storage Service and MinIO Infrastructure Summary

**S3 storage abstraction with uploadImage/deleteImage/getImageUrl using @aws-sdk/client-s3, plus MinIO in Docker Compose with automatic bucket creation**

## Performance

- **Duration:** 2 min
- **Started:** 2026-04-05T10:14:02Z
- **Completed:** 2026-04-05T10:16:24Z
- **Tasks:** 2
- **Files modified:** 7

## Accomplishments
- Storage service wrapping @aws-sdk/client-s3 with forcePathStyle for MinIO compatibility
- Presigned URL helpers (withImageUrl, withImageUrls) for enriching API responses
- MinIO in both Docker Compose files with mc init container for automatic bucket creation
- S3 environment variable documentation in .env.example

## Task Commits

Each task was committed atomically:

1. **Task 1: Install S3 SDK and create storage service** - `f845f87` (feat)
2. **Task 2: Add MinIO to Docker Compose and update env config** - `88f988c` (chore)

## Files Created/Modified
- `src/server/services/storage.service.ts` - S3 storage abstraction with 5 exported functions
- `tests/services/storage.service.test.ts` - 8 unit tests with mocked S3Client
- `docker-compose.dev.yml` - Added MinIO + minio-init with fixed dev credentials
- `docker-compose.yml` - Added MinIO + minio-init with env var credentials, removed uploads volume
- `.env.example` - Added S3 configuration section
- `package.json` - Added @aws-sdk/client-s3 and @aws-sdk/s3-request-presigner
- `bun.lock` - Updated lockfile

## Decisions Made
- Private bucket with presigned URLs (no public-read) for security
- 1-hour presigned URL expiry default, configurable via S3_PRESIGN_EXPIRY env var
- No console port (9001) exposed in production compose, only API port (9000)
- Dev compose uses fixed minioadmin/minioadmin credentials for simplicity
- Production compose removed uploads volume (replaced by MinIO object storage)

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered
None

## User Setup Required
None - no external service configuration required. MinIO starts automatically via Docker Compose.

## Next Phase Readiness
- Storage service ready for Plan 02 (image route refactoring) to call uploadImage/deleteImage/getImageUrl
- withImageUrl/withImageUrls helpers ready for API response enrichment
- Docker Compose MinIO available for integration testing

---
*Phase: 17-object-storage*
*Completed: 2026-04-05*