smarts3/readme.hints.md

# Project Hints for smarts3

## Current State (v6.0.0-dev)

- **Rust-powered S3 server** via `@push.rocks/smartrust` IPC bridge
- High-performance: streaming I/O, zero-copy, backpressure, range seek
- TypeScript is thin IPC wrapper; all HTTP/storage/routing in Rust binary `rusts3`
- Full S3 compatibility: PUT, GET, HEAD, DELETE for objects and buckets
- Multipart upload support (streaming, no OOM)
- **Real AWS SigV4 authentication** (cryptographic signature verification)
- **Bucket policies** (AWS/MinIO-compatible JSON policies, public access support)
- CORS support
- ListBuckets, ListObjects (v1/v2), CopyObject

## Architecture

### Rust Binary (`rust/src/`)
- `main.rs` - Clap CLI, management mode entry
- `config.rs` - Serde config structs matching TS interfaces (includes `region`)
- `management.rs` - IPC loop (newline-delimited JSON over stdin/stdout)
- `server.rs` - hyper 1.x HTTP server, routing, CORS, auth+policy pipeline, all S3 handlers
- `storage.rs` - FileStore: filesystem-backed storage, multipart manager, `.policies/` dir
- `xml_response.rs` - S3 XML response builders
- `s3_error.rs` - S3 error codes with HTTP status mapping
- `auth.rs` - AWS SigV4 signature verification (HMAC-SHA256, clock skew, constant-time compare)
- `action.rs` - S3Action enum + request-to-IAM-action resolver + RequestContext
- `policy.rs` - BucketPolicy model, evaluation engine (Deny > Allow > NoOpinion), PolicyStore (RwLock cache + disk)

### TypeScript Bridge (`ts/`)
- `ts/index.ts` - Smarts3 class with RustBridge<TRustS3Commands>
- `ts/plugins.ts` - path, smartpath, RustBridge, tsclass
- `ts/paths.ts` - packageDir, bucketsDir defaults

### IPC Commands
| Command | Params | Action |
|---------|--------|--------|
| `start` | `{ config: ISmarts3Config }` | Init storage + HTTP server |
| `stop` | `{}` | Graceful shutdown |
| `createBucket` | `{ name: string }` | Create bucket directory |

### Storage Layout (backward-compatible)
- Objects: `{root}/{bucket}/{key}._S3_object`
- Metadata: `{root}/{bucket}/{key}._S3_object.metadata.json`
- MD5: `{root}/{bucket}/{key}._S3_object.md5`
- Multipart: `{root}/.multipart/{upload_id}/part-{N}`
- Policies: `{root}/.policies/{bucket}.policy.json`

## Build

- `pnpm build` runs `tsrust && tsbuild --web --allowimplicitany`
- `tsrust` compiles Rust to `dist_rust/rusts3`
- Targets: linux_amd64, linux_arm64 (configured in npmextra.json)

## Dependencies

- `@push.rocks/smartrust` - RustBridge IPC bridge
- `@push.rocks/smartpath` - Path utilities
- `@tsclass/tsclass` - IS3Descriptor type
- `@git.zone/tsrust` (devDep) - Rust cross-compilation

## Testing

- `test/test.aws-sdk.node.ts` - AWS SDK v3 compatibility (10 tests, auth disabled, port 3337)
- `test/test.auth.node.ts` - Auth + bucket policy integration (20 tests, auth enabled, port 3344)
- `test/test.policy-crud.node.ts` - Policy API CRUD + validation edge cases (17 tests, port 3345)
- `test/test.policy-eval.node.ts` - Policy evaluation: principals, actions, resources, deny-vs-allow (22 tests, port 3346)
- `test/test.policy-actions.node.ts` - Per-action policy enforcement (15 tests, port 3347)
- `test/test.ts` - SmartBucket integration (3 tests)
- Run: `pnpm test` or `tstest test/test.aws-sdk.node.ts --verbose`