# Host product catalog with SvelteKit: authorized file delivery

Deploy a product catalog built with SvelteKit 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 SvelteKit: 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 product catalog-specific behavior as your application code.

## Representative Queries
- Host product catalog with SvelteKit: authorized file delivery
- Where can I host Product catalog built with SvelteKit?
- 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
- **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.

### 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.

### 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
1. A SvelteKit project that builds and starts with the documented commands (vite build with @sveltejs/adapter-node then node build on the node-22 template)
2. A PostgreSQL driver reading DATABASE_URL at runtime (auto-provisioned when omitted, or supplied with --env)
3. A bucket from `ample bucket create` with its credentials passed as encrypted S3_* environment variables
4. An Ample account token with servers:write, databases:read, buckets:read

## Tested Configuration
- **Template:** node-22
- **Runtime:** node
- **Size:** s-1vcpu-1gb
- **Install:** npm install
- **Build:** npm run build --if-present
- **Start:** npm run start

## Workflow Steps
1. **Build and start**  
vite build with @sveltejs/adapter-node then node build on the node-22 template. 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

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

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

## Limitations
- Verified on the node-22 template at s-1vcpu-1gb with the example fixture; other sizes, templates and SvelteKit major versions are not verified.
- The product catalog 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  
- **Authoritative:** true  
- **Basis:** size prices from pricing.toml (loaded by the API) at build revision 1ac5595375130d45290090e82ed0f554ccd45405-dirty  
- **Components:**  
  - **App server**: s-1vcpu-1gb (1.0) - $5.0  
  - **Managed PostgreSQL database**: s-1vcpu-1gb (1.0) - $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
1. **Canary Run**: SvelteKit pattern fixture deployed on Ample (vite build with @sveltejs/adapter-node then node build on the node-22 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: 2026-09-20T03:31:44Z  
   Implementation Revision: 03b6402b1b3e19178985f08ea4033804521d85d4-dirty (CLI b75e104)  
   Expires At: 2027-03-19T03:31:44Z

2. **Canary Run**: The same SvelteKit app deployed with a --release-command migration; the marker it created was readable after activation.  
   Observed At: 2026-09-20T02:16:51Z  
   Implementation Revision: 199ff1dfd52683832ae75d3f98b53a7a4bff7f96-dirty (CLI e3181f5)  
   Expires At: 2027-03-19T02:16:51Z

## Unknowns
- Region availability is unknown until a verified region fact is recorded
- Compliance attestations are unknown; none are claimed

## Formats
- [HTML](/content/recipes/product-catalog/sveltekit/download-delivery/index.html)  
- [Markdown](/content/recipes/product-catalog/sveltekit/download-delivery.md)  
- [JSON](https://api.ample.computer/v1/catalog/recipes/page%3Arecipes%3Aproduct-catalog%3Asveltekit%3Adownload-delivery)

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

2. **Search published recipes by intent, stack and constraints**  
   - **Action ID:** search-recipes  
   - **Operation ID:** search_recipes  
   - **Method:** POST  
   - **Relative Path:** /v1/catalog/search  
   - **Parameters:** {"body":{"limit":5,"query":"Host product catalog with SvelteKit: authorized file delivery"}}

3. **Prepare a side-effect-free deployment plan for an authorized project**  
   - **Action ID:** plan:page:recipes:product-catalog:sveltekit:download-delivery  
   - **Operation ID:** plan_deployment  
   - **Method:** POST  
   - **Relative Path:** /v1/catalog/plan  
   - **Parameters:** {"body":{"inputs":{},"projectId":"","recipeId":"page:recipes:product-catalog:sveltekit:download-delivery","recipeRevision":"r1"}}

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

5. **Browse Product catalog**  
   - **Action ID:** browse:workload:product-catalog  
   - **Operation ID:** browse_node  
   - **Method:** GET  
   - **Relative Path:** /v1/catalog/nodes/workload%3Aproduct-catalog

6. **Browse SvelteKit**  
   - **Action ID:** browse:stack:framework-sveltekit  
   - **Operation ID:** browse_node  
   - **Method:** GET  
   - **Relative Path:** /v1/catalog/nodes/stack%3Aframework-sveltekit

7. **Browse Generated downloads**  
   - **Action ID:** browse:pattern:generated-downloads  
   - **Operation ID:** browse_node  
   - **Method:** GET  
   - **Relative Path:** /v1/catalog/nodes/pattern%3Agenerated-downloads

8. **Browse Deploy web app**  
   - **Action ID:** browse:intent:deploy-web-app  
   - **Operation ID:** browse_node  
   - **Method:** GET  
   - **Relative Path:** /v1/catalog/nodes/intent%3Adeploy-web-app