# Host subscription content with Phoenix: authorized file delivery

Deploy a subscription content built with Phoenix 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 Phoenix: 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 subscription content-specific behavior as your application code.

## Representative Queries
- Host subscription content with Phoenix: authorized file delivery
- Where can I host Subscription content built with Phoenix?
- 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
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.

## Prerequisites
- A Phoenix project that builds and starts with the documented commands (mix deps.get, MIX_ENV=prod mix compile and mix release in the builder, then the release bin script with PHX_SERVER=true on the elixir-1.18 template; PORT, DATABASE_URL and SECRET_KEY_BASE read in config/runtime.exs)
- A PostgreSQL driver reading DATABASE_URL at runtime (auto-provisioned when omitted, or supplied with --env)
- A bucket from `ample bucket create` with its credentials passed as encrypted S3_* environment variables
- An Ample account token with servers:write, databases:read, buckets:read

## Workflow Steps
1. **Build and start**  
   Command: `mix deps.get, MIX_ENV=prod mix compile and mix release in the builder, then the release bin script with PHX_SERVER=true on the elixir-1.18 template; PORT, DATABASE_URL and SECRET_KEY_BASE read in config/runtime.exs. The server must bind 0.0.0.0 on PORT.`

2. **Implement the pattern on PostgreSQL**  
   Body: 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**  
   Body: 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**  
   Command: `ample deploy . --name  --public --env S3_ENDPOINT=... --env S3_REGION=... --env S3_BUCKET=... --env S3_ACCESS_KEY_ID=... --env S3_SECRET_ACCESS_KEY=...`
   Body: 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.

5. **Verify**  
   Command: `ample logs  --kind build`  
   Body: 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`.

## Examples
- **Phoenix pattern fixture**  
  Description: Multi-pattern Phoenix app whose generated downloads module was checked live; the module is under tests/deploy-canaries/_pattern-modules.
  Source Ref: tests/deploy-canaries/phoenix-patterns

## Success Checks
1. **App responds on its public URL**  
   Kind: http_get  
   Path: `/`  
   Expect: `ample canary phoenix patterns`

2. **Generated-downloads self-test**  
   Kind: http_get  
   Path: `/p/generated-downloads`  
   Expect: `export=ok rows=3 (with ?token=...; 401 without)`

## Limitations
- Verified on the elixir-1.18 template at s-1vcpu-1gb with the example fixture; other sizes, templates and Phoenix major versions are not verified.
- The subscription content 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.

## 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: s-1vcpu-1gb (Quantity: 1.0, Monthly Amount: 5.0)  
  - Managed PostgreSQL database: 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**: Phoenix pattern fixture deployed on Ample (mix deps.get, MIX_ENV=prod mix compile and mix release in the builder, then the release bin script with PHX_SERVER=true on the elixir-1.18 template; checks passed for generated-downloads and configuration-secrets. Pattern proof: 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).
- **Observed At**: 2026-09-20T23:45:31Z  
  **Implementation Revision**: 4d1511e574302f3904b75088bd4048a0975218b3-dirty (CLI 0.1.21)  
  **Expires At**: 2027-03-19T23:45:31Z  
  **Scope**: checks=[/p/generated-downloads], pattern=pattern:generated-downloads, template=elixir-1.18

## Next Actions
- **Browse the catalog index**  
  Operation ID: `catalog_index`  
  Method: GET  
  Relative Path: `/v1/catalog`  
- **Search published recipes**  
  Operation ID: `search_recipes`  
  Method: POST  
  Relative Path: `/v1/catalog/search`  
  Requires Authentication: No  
  Parameters: {"body":{"limit":5,"query":"Host subscription content with Phoenix: authorized file delivery"}}  
- **Prepare a deployment plan**  
  Operation ID: `plan_deployment`  
  Method: POST  
  Relative Path: `/v1/catalog/plan`  
  Requires Authentication: Yes  
  Parameters: {"body":{"inputs":{},"projectId":"","recipeId":"page:recipes:subscription-content:phoenix:download-delivery","recipeRevision":"r1"}}.