page:guides:nestjs:private file access

Enforce private-file authorization for NestJS

Summary

Private file access for a NestJS app on Ample. Verified on NestJS: a role-to-document access model with negative tests (401, 403) and an authorized private-bucket round-trip (private=ok). Build and start: npm install, nest build (TypeScript) then node dist/main.js on the node-22 template.

Representative Queries

• Enforce private-file authorization for NestJS
• Where can I host Enforce private-file authorization built with NestJS?
• 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
   npm install, nest build (TypeScript) then node dist/main.js on the node-22 template; 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   Return 401 for unauthenticated requests and 403 for the wrong role; keep the bucket unpublished and stream objects through the app.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

Limitations

• Verified on the node-22 template at s-1vcpu-1gb; other sizes and NestJS 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
• 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 auto-pause when idle. Buckets are allocation-priced per quota and not included.

Evidence Summary

• Kind: canary_run
• Summary: NestJS pattern fixture deployed on Ample (npm install, nest build (TypeScript) then node dist/main.js on the node-22 template); for this guide: a role-to-document access model with negative tests (401, 403) and an authorized private-bucket round-trip (private=ok).
• Observed At: 2026-09-21T02:34:39Z
• Expires At: 2027-03-20T02:34:39Z
• Checks: /p/private-document-library

Next Actions

• Browse the catalog index

  • Method: GET
  • Relative Path: /v1/catalog

• Search published recipes by intent, stack and constraints

  • Method: POST
  • Relative Path: /v1/catalog/search
  • Parameters: { "body": { "limit": 5, "query": "Enforce private-file authorization for NestJS" }}

• Prepare a side-effect-free deployment plan for an authorized project

  • Method: POST
  • Relative Path: /v1/catalog/plan
  • Parameters: { "body": { "inputs": {}, "projectId": "", "recipeId": "page:guides:nestjs:private-file-access", "recipeRevision": "r1" }}

• Read the existing agent authentication setup

  • Method: GET
  • Relative Path: /mcp/setup

• Browse NestJS

  • Method: GET
  • Relative Path: /v1/catalog/nodes/stack%3Aframework-nestjs

• Browse Connect app to storage

  • Method: GET
  • Relative Path: /v1/catalog/nodes/intent%3Aconnect-app-to-storage

• Browse Private document library

  • Method: GET
  • Relative Path: /v1/catalog/nodes/pattern%3Aprivate-document-library