## Host marketplace with Rails: authorized file delivery

Deploy a marketplace built with Rails on Ample using the generated downloads pattern. Compute runs the app in an isolated microVM behind a public HTTPS URL, a managed PostgreSQL 16 database is auto-provisioned and injected as DATABASE_URL, a private S3-compatible bucket holds objects with credentials delivered as encrypted environment variables. Verified on Rails: an export query rendered to a CSV artifact stored with metadata in a private bucket and returned only to an authorized caller (401 without token, export=ok rows=3). Not separately tested: your export formats, retention policy and entitlement model; treat the marketplace-specific behavior as your application code.

### Representative Queries
- Host marketplace with Rails: authorized file delivery  
- Where can I host Marketplace built with Rails?  
- I need a file entitlement model and an application-enforced download authorization flow.

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

### Infrastructure Requirements
- **Compute**: Apps run in isolated x86_64 Firecracker microVMs that auto-pause when idle and wake on request; sizes are the priced VM sizes.
- **Postgres**: Managed PostgreSQL 16 runs in its own microVM and is auto-provisioned when an app needs a database and no DATABASE_URL is supplied.
- **S3-compatible object storage**: 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**: bundle install into vendor/bundle from Gemfile.lock (development and test groups skipped), then Puma via `rails server` reading PORT on the ruby-3.4 template with RAILS_ENV=production. The server must bind 0.0.0.0 on PORT.
2. **Implement the pattern on PostgreSQL**: The fixture's module implements generated downloads: an export query rendered to a CSV artifact stored with metadata in a private bucket and returned only to an authorized caller (401 without token, export=ok rows=3). Copy the approach into your schema; keep migrations idempotent and run them with --release-command.
3. **Wire object storage**: Create the bucket(s), then pass endpoint, region, bucket and keys as --env values. Use path-style addressing. Keep private data in an unpublished bucket.
4. **Deploy**: Run the synchronous deploy once and read the result (exit 0 live, 1 failed, 2 blocked). Re-running with no change is a no-op.  
   Command: `ample deploy . --name --public --env S3_ENDPOINT=... --env S3_REGION=... --env S3_BUCKET=... --env S3_ACCESS_KEY_ID=... --env S3_SECRET_ACCESS_KEY=...`
5. **Verify**: Fetch the live URL and the pattern self-test route(s) (/p/generated-downloads) from the example; then run your own checks. On failure read `ample logs --kind build` then `--kind runtime`.  
   Command: `ample logs --kind build`

### Examples
- **Rails pattern fixture**: Multi-pattern Rails app whose generated downloads module was checked live; the module is under tests/deploy-canaries/_pattern-modules.

### Success Checks
- App responds on its public URL (HTTP GET path: `/`, expect: `ample canary rails patterns`)
- Generated-downloads self-test (HTTP GET path: `/p/generated-downloads`, expect: `export=ok rows=3 (with ?token=...; 401 without)`)

### Limitations
- Verified on the ruby-3.4 template at s-1vcpu-1gb with the example fixture; other sizes, templates and Rails major versions are not verified.
- The marketplace itself (your export formats, retention policy and entitlement model) is application code and was not separately tested; the pattern checks are what was verified.
- Region, compliance attestations and request-duration limits are unknown and not claimed.
- Apps auto-pause when idle and wake on the next request; always-on is an operator setting, not a plan feature.
- Managed PostgreSQL 16 only; extensions, connection limits and backup or restore procedures are not verified; apps and their databases are placed together.
- PutObject and GetObject with path-style addressing are verified; multipart upload, listing, presigned URLs and lifecycle rules are not verified.

### Cost Estimate
- **Currency**: USD
- **Monthly Amount**: 10.0
- **Basis**: Size prices from pricing.toml (loaded by the API) at build revision 1ac5595375130d45290090e82ed0f554ccd45405-dirty.
- **Components**:  
   - App server (size: s-1vcpu-1gb, quantity: 1.0, monthly amount: 5.0)  
   - Managed PostgreSQL database (size: s-1vcpu-1gb, quantity: 1.0, monthly amount: 5.0)
- **Note**: Always-on monthly price of the tested sizes; apps and databases auto-pause when idle. Buckets are allocation-priced per quota and not included.

### Evidence Summary
- **Canary Run**: Rails pattern fixture deployed on Ample; checks passed for generated-downloads and configuration-secrets.  
  - **Observed At**: 2026-09-20T21:55:28Z  
  - **Implementation Revision**: 4f7cb9813c1f-dirty (CLI 4f7cb98)
  - **Expires At**: 2027-03-19T21:55:28Z  
  - **Scope**: Checks: [`/p/generated-downloads`], pattern: `pattern:generated-downloads`, template: `ruby-3.4`.
- **Canary Run**: The same Rails app deployed with a --release-command migration; the marker it created was readable after activation.  
  - **Observed At**: 2026-09-20T21:55:28Z  
  - **Implementation Revision**: 4f7cb9813c1f-dirty (CLI 4f7cb98)
  - **Expires At**: 2027-03-19T21:55:28Z  
  - **Scope**: Pattern: `pattern:generated-downloads`.

### Last Verified At
- 2026-09-20T21:55:28Z

### Next Actions
- **Browse the catalog index**: GET `/v1/catalog`
- **Search published recipes by intent, stack and constraints**: POST `/v1/catalog/search` with query: `Host marketplace with Rails: authorized file delivery`  
- **Prepare a side-effect-free deployment plan**: POST `/v1/catalog/plan`
- **Read the existing agent authentication setup**: GET `/mcp/setup`
- **Browse Marketplace**: GET `/v1/catalog/nodes/workload%3Amarketplace`
- **Browse Rails**: GET `/v1/catalog/nodes/stack%3Aframework-rails`
- **Browse Generated downloads**: GET `/v1/catalog/nodes/pattern%3Agenerated-downloads`
- **Browse Deploy web app**: GET `/v1/catalog/nodes/intent%3Adeploy-web-app`