### Enforce Private-File Authorization for Gin

#### Summary
Private file access for a Gin app on Ample. Verified on Gin: a role-to-document access model with negative tests (401, 403) and an authorized private-bucket round-trip (private=ok). Build and start: `CGO_ENABLED=0 go build -o app ./...` then `./app` on the ubuntu-24.04 template (go.sum committed for a reproducible build).

#### Representative Queries
- Enforce private-file authorization for Gin
- Where can I host Enforce private-file authorization built with Gin?
- I need application identity integration, per-file access rules and negative authorization tests.

#### Resource Requirements
- primitive:compute
- primitive:postgres
- primitive:s3-compatible-object-storage

#### Infrastructure Requirements
1. **Compute**  
   - Status: verified  
   - Summary: Apps run in isolated x86_64 Firecracker microVMs that auto-pause when idle and wake on request; sizes are the priced VM sizes.

2. **Postgres**  
   - Status: verified  
   - Summary: Managed PostgreSQL 16 runs in its own microVM and is auto-provisioned when an app needs a database and no DATABASE_URL is supplied.

3. **S3-compatible object storage**  
   - Status: verified  
   - Summary: Buckets are S3-compatible with issued credentials; PutObject and GetObject are verified by canary. Other S3 operations are not verified.

#### Workflow Steps
1. **Build and start**  
   CGO_ENABLED=0 go build -o app ./... then ./app on the ubuntu-24.04 template (go.sum committed for a reproducible build); the server must bind 0.0.0.0 on PORT.

2. **Create the bucket and pass its credentials**  
   Create it once with `ample bucket create`, then pass endpoint, region, bucket and keys with --env; use path-style addressing.  
   Command: `ample deploy . --name --public --env S3_ENDPOINT=... --env S3_REGION=... --env S3_BUCKET=... --env S3_ACCESS_KEY_ID=... --env S3_SECRET_ACCESS_KEY=...`

3. **Authorize before touching storage**  
   Return 401 for unauthenticated requests and 403 for the wrong role; keep the bucket unpublished and stream objects through the app.

4. **Verify**  
   Fetch the live URL and /p/private-document-library on the example; on failure read the build and runtime logs.  
   Command: `ample logs --kind build`

#### Examples
- **Gin pattern fixture**  
  Verified private file access on Gin.

#### Success Checks
1. app responds on its public URL
   - Kind: http_get  
   - Path: /  
   - Expect: ample canary gin patterns

2. private-document-library check from the example
   - Kind: http_get  
   - Path: /p/private-document-library  
   - Expect: see the pattern fixture checks

#### Limitations
- Verified on the ubuntu-24.04 template at s-1vcpu-1gb; other sizes and Gin major versions are not verified.
- Region, compliance attestations and request-duration limits are unknown and not claimed.
- Managed PostgreSQL 16 only; extensions, connection limits and backup or restore procedures are not verified.
- PutObject and GetObject with path-style addressing are verified; other S3 operations are not.

#### Cost Estimate
- Currency: USD
- Monthly Amount: 10.0
- Basis: size prices from pricing.toml (loaded by the API) at build revision 1ac5595375130d45290090e82ed0f554ccd45405-dirty

**Components**  
1. App server  
   - Size: s-1vcpu-1gb  
   - Quantity: 1.0  
   - Monthly Amount: 5.0

2. Managed PostgreSQL database  
   - Size: s-1vcpu-1gb  
   - Quantity: 1.0  
   - Monthly Amount: 5.0

**Note:** Always-on monthly price of the tested sizes; apps auto-pause when idle. Buckets are allocation-priced per quota and not included.

#### Next Actions
1. **Browse the catalog index**  
   Action ID: browse-catalog  
   Method: GET  
   Relative Path: /v1/catalog

2. **Search published recipes by intent, stack and constraints**  
   Action ID: search-recipes  
   Method: POST  
   Relative Path: /v1/catalog/search

3. **Prepare a side-effect-free deployment plan for an authorized project**  
   Action ID: plan:page:guides:gin:private-file-access  
   Method: POST  
   Relative Path: /v1/catalog/plan

4. **Read existing agent authentication setup**  
   Action ID: auth-setup  
   Method: GET  
   Relative Path: /mcp/setup

5. **Browse Gin**  
   Action ID: browse:stack:framework-gin  
   Method: GET  
   Relative Path: /v1/catalog/nodes/stack%3Aframework-gin

6. **Browse Connect app to storage**  
   Action ID: browse:intent:connect-app-to-storage  
   Method: GET  
   Relative Path: /v1/catalog/nodes/intent%3Aconnect-app-to-storage

7. **Browse Private document library**  
   Action ID: browse:pattern:private-document-library  
   Method: GET  
   Relative Path: /v1/catalog/nodes/pattern%3Aprivate-document-library