# s3 — S3 bucket

> **Module kind:** L1 primitive  |  **Version:** 1.0.0

A single S3 bucket for object storage. The simplest module — one
resource, two inputs, two outputs. Versioning is enabled by default.

## Resources

| Resource | Type | Purpose |
|----------|------|---------|
| bucket | `aws_s3_bucket` | The S3 bucket itself |

## Inputs

| Name | Type | Required | Default | Description |
|------|------|----------|---------|-------------|
| `bucket_name` | string | yes | — | Globally-unique S3 bucket name |
| `region` | string | yes | — | AWS region the bucket is created in |

## Outputs

| Name | Type | Description |
|------|------|-------------|
| `bucket_arn` | arn | The S3 bucket ARN |
| `bucket_name` | string | The bucket name (echoes the input) |

## NFRs

| Name | Type | Default | Description |
|------|------|---------|-------------|
| `versioning` | boolean | true | Enable S3 versioning |

## Usage

```json
{
  "id": "s3",
  "type": "aws:s3:bucket",
  "module": "s3@1.0.0",
  "inputs": {
    "bucket_name": "acdl-spike-bucket",
    "region": "us-east-1"
  }
}
```

A concrete instance is at `instance.json` (used by the platform
pipeline as the regression baseline).

## Compliance extension points

- **Encryption at rest** — add `aws_s3_bucket_server_side_encryption_configuration` with a customer-managed KMS key (SOC2 CC6.1, HIPAA §164.312(a)(2)(iv), GDPR Art.32).
- **Object Lock** — add `aws_s3_bucket_object_lock_configuration` in compliance mode with 7-year retention for immutable evidence (SOX §802, DORA audit trail).
- **Access logging** — add `aws_s3_bucket_logging` to a target logging bucket (SOC2 CC7.2).
- **Public access block** — add `aws_s3_bucket_public_access_block` to prevent data exfiltration (SOC2 CC6.1, GDPR Art.32).
- **Lifecycle policy** — add `aws_s3_bucket_lifecycle_configuration` for retention enforcement (GDPR Art.5(2), HIPAA §164.530(j)).

## Versioning

`1.0.0` — interface MAJOR, behavior MINOR, lifecycle PATCH. MAJOR bumps
require a new registry entry (immutable publication); old entries enter
a 12-month deprecation window.