## The short version

A vendor portal blueprint for construction contractors built with Next.js on Ample. Domain schema: 
- **listings** (reference, project_type, location, publishing_status, agency_id): showcase projects with publishing status;
- **agencies** (name, license_number, service_region): branches or divisions;
- **vendors** (name, trade, agency_id, prequalified): subcontractors and suppliers per branch;
- **reports** (agency_id, period, object_key, generated_at): branch progress reports;
- **document_access** (document_id, principal_reference, role, granted_at): who may read which document.

Public information: published project showcases, services and regions, licenses and insurance summary. Kept out of scope until handling is reviewed: site safety incidents, bid pricing, client contracts. Safety and bid data are confidential; only published showcases and branch reporting are modeled. Technical basis verified on Next.js: a role-to-document access model with negative tests (401 without identity, 403 for the wrong role) and a private-bucket round-trip for the allowed role (private=ok).

---

## What it needs

- [Compute](/content/discover/primitive/compute/index.html): verified (Apps run in isolated x86_64 Firecracker microVMs; sizes are the priced VM sizes.)  
- [Postgres](/content/discover/primitive/postgres/index.html): verified (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](/content/discover/primitive/s3-compatible-object-storage/index.html): verified (Buckets are S3-compatible with issued credentials; PutObject and GetObject are verified by canary. Other S3 operations are not verified.)

---

## Before you start

- A Next.js project (next build then next start -H 0.0.0.0 -p $PORT on the node-22 template)  
- A PostgreSQL driver reading DATABASE_URL (auto-provisioned when omitted)  
- Bucket credentials from `ample bucket create` passed as encrypted S3_* environment variables  
- A review of which construction contractors data classes may be handled at all; this blueprint models public information only

---

## How to do it

1.  **Model the construction contractors domain**

Create the tables listings, agencies, vendors, reports, document_access. Showcase projects with publishing status lives in listings; keep the sensitive classes (site safety incidents, bid pricing, client contracts) out of this schema.

2.  **Workflow step 1**

Model vendors scoped to the agency with roles

3.  **Workflow step 2**

Authorize document access by vendor and role (401, 403 negative tests)

4.  **Workflow step 3**

Store vendor documents in the private bucket

5.  **Workflow step 4**

Deploy and verify the negative tests and an authorized download

6.  **Deploy**

Run the synchronous deploy once and read the result. Re-running with no change is a no-op.

```
    ample deploy . --name <app-name> --public --env S3_ENDPOINT=... --env S3_REGION=... --env S3_BUCKET=... --env S3_ACCESS_KEY_ID=... --env S3_SECRET_ACCESS_KEY=...
    ```

7.  **Verify**

Run the pattern self-test(s) from the example (/p/private-document-library) and your own acceptance checks for the construction contractors workflow.

```
    ample logs <deployment_id> --kind build
    ```

---

## Tested examples

- **Next.js pattern fixture** (`tests/deploy-canaries/next-js-patterns`): Verified private document library basis for this blueprint.

---

## How to know it worked

- app responds on its public URL (`/` on the live URL, expect ample canary next js patterns)  
- private-document-library self-test from the example (`/p/private-document-library` on the live URL, expect see the pattern fixture checks)

---

## Cost estimate

Estimated 10.00 USD per month (size prices from pricing.toml at build revision ca0b484a7a9957c573a88d3a32dc603c3c10135a).

- app server x1 `s-1vcpu-1gb`: 5.00 USD  
- managed PostgreSQL database x1 `s-1vcpu-1gb`: 5.00 USD

Upper-bound monthly price of the tested sizes. Buckets are allocation-priced per quota and not included.

---

## Verification evidence

- canary_run on 2026-09-21T02:34:39Z at revision `1d28ae0 (CLI 0.1.21)`: Next.js pattern fixture deployed on Ample (next build then next start -H 0.0.0.0 -p $PORT on the node-22 template); the private document library checks passed: a role-to-document access model with negative tests (401 without identity, 403 for the wrong role) and a private-bucket round-trip for the allowed role (private=ok). The blueprint's Construction contractors schema and workflow below build on that verified basis and were not separately executed. (expires 2027-03-20T02:34:39Z)

---

## Execution binding

MCP tool `ample_deploy` (registry `mcp:ample_deploy`), schema hash `876465fce906da0c` observed 2026-09-22T00:31:22.774679+00:00 at revision `e6446ceea69b`. Binding state at export: schema_changed. Required scopes: servers:write, databases:read, buckets:read.

---

## Typed next actions

- Browse the catalog index (`GET /v1/catalog` on the api origin; authentication not required, approval not required)  
- Search published recipes by intent, stack and constraints (`POST /v1/catalog/search` on the api origin; authentication not required, approval not required)  
- Prepare a side-effect-free deployment plan for an authorized project (`POST /v1/catalog/plan` on the api origin; authentication required, approval not required)  
- Read the existing agent authentication setup (`GET /mcp/setup` on the api origin; authentication not required, approval not required)  
- Browse Construction contractors (`GET /v1/catalog/nodes/industry%3Aconstruction-contractors` on the api origin; authentication not required, approval not required)  
- Browse Vendor portal (`GET /v1/catalog/nodes/workload%3Avendor-portal` on the api origin; authentication not required, approval not required)  
- Browse Next.js (`GET /v1/catalog/nodes/stack%3Aframework-next-js` on the api origin; authentication not required, approval not required)  
- Browse Deploy web app (`GET /v1/catalog/nodes/intent%3Adeploy-web-app` on the api origin; authentication not required, approval not required)

---

## Identifiers and status

Recipe `page:blueprints:construction-contractors:vendor-portal:next-js`. Revision r1.

release **published** support **verified** execution **blocked (schema_changed: live tool schema differs from the recorded binding)**

Formats: [HTML](/content/blueprints/construction-contractors/vendor-portal/next-js/index.html) | [Markdown](/content/blueprints/construction-contractors/vendor-portal/next-js.md) | [JSON contract](https://api.ample.computer/v1/catalog/recipes/page%3Ablueprints%3Aconstruction-contractors%3Avendor-portal%3Anext-js)