anaf-api-simulator

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anaf-api-simulator

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The high-fidelity digital twin for Romanian ANAF APIs. A standalone simulator for OAuth2, e-Factura (UBL 2.1), and VAT registry workflows, featuring a built-in developer portal for local integration testing.

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# ANAF API Simulation Engine

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A NestJS-based high-fidelity simulator for building and testing integrations with Romanian ANAF APIs, including OAuth2, e-Factura, and VAT lookup workflows.

This service is designed for local development and CI environments where you want realistic API behavior without requiring a physical digital certificate, live ANAF credentials, or an actual ANAF developer account.

![ANAF Mock Server Demo](https://raw.githubusercontent.com/aperta-sync/anaf-api-simulator/main/docs/assets/demo.gif)

## Features

- **Full OAuth2 Flow:** Authorization Code grant flow, Token exchange, and Refresh support.
- **e-Factura Simulation:** 100% OpenAPI compliant implementations of `/upload`, `/uploadb2c`, `/stareMesaj`, `/listaMesajeFactura`, `/listaMesajePaginatieFactura`, and `/descarcare`.
- **ANAF-Specific Rate Limiting:** Enforces official daily quotas (e.g., 1000 RASP/day, 100,000 paginated list queries/day) with exact ANAF error messages.
- **Strict Validation:** Replicates ANAF's unique HTTP 200 XML/JSON error responses for file sizes (>10MB), invalid timestamps (60-day limits), and missing parameters.
- **Swagger API Documentation:** Interactive Swagger UI at `/swagger` cross-referencing official ANAF URLs and fully documenting all simulation cheat headers.
- **MCP (Model Context Protocol) Server:** Built-in MCP server at `/mcp` (Streamable HTTP transport) turning the mock into an AI-native tool. AI agents (Claude, Gemini, Cursor, Windsurf) can dynamically read ANAF schemas, understand cheat headers, and execute tools to generate valid integration code.
- **Fault Injection:** Configurable latency, random 500/504 errors, and generic 429 rate-limiting modes for edge-case testing.
- **Traffic Generation:** Background tasks to simulate active SPV inboxes with realistic inter-company invoice flow.
- **VAT Registry Simulation:** Mock VAT lookup (v9 standard) with deterministic company data.
- **Developer Portal UI:** Built-in dashboard at `/console` for app registration and identity management.
- **Flexible Storage:** In-memory state by default, or Redis-backed for persistent simulation across restarts.

---

## Getting Started

### Local Development

1. **Install Dependencies:**
   ```bash
   npm install
   ```
2. **Run in Watch Mode:**
   ```bash
   npm run start:dev
   ```
   Open `http://localhost:3003/console` to manage the mock environment.

### Docker Usage

The project is published as a multi-stage **lightweight Docker image** (Alpine-based) to GitHub Container Registry (GHCR).

#### 1. Quick Start (Official Image)
Run the latest stable release directly from GHCR:
```bash
docker run -p 3003:3003 ghcr.io/aperta-sync/anaf-api-simulator:latest
```

#### 2. Local Build
If you want to build the image locally from source:
```bash
docker build -t anaf-mock-server:latest .
docker run -p 3003:3003 anaf-mock-server:latest
```

#### 3. Custom Simulation Settings
You can customize the simulation behavior via environment variables:
```bash
docker run -p 3003:3003 \
  -e ANAF_MOCK_LATENCY_MS=500 \
  -e ANAF_MOCK_ERROR_RATE=5 \
  -e ANAF_MOCK_STRICT_OWNERSHIP=true \
  ghcr.io/aperta-sync/anaf-api-simulator:latest
```

---

## MCP Server Setup (AI Integration)

This mock server includes a built-in **Model Context Protocol (MCP)** server that turns the entire ANAF API simulation into a set of tools for AI agents. This allows LLMs (like Claude or Gemini) to dynamically generate, test, and debug your ANAF integration.

The server uses the **Streamable HTTP** transport (the current MCP standard) at a single endpoint: `http://localhost:3003/mcp`.

### 1. Claude Code

```bash
claude mcp add --transport http anaf-mock-server http://localhost:3003/mcp
```

To verify the server was added:
```bash
claude mcp list
```

To remove it:
```bash
claude mcp remove anaf-mock-server
```

### 2. Gemini CLI

Add the following to `~/.gemini/settings.json`:

```json
{
  "mcpServers": {
    "anaf-mock-server": {
      "httpUrl": "http://localhost:3003/mcp",
      "timeout": 30000
    }
  }
}
```

> **Note:** The `httpUrl` key targets the Streamable HTTP transport. If your Gemini CLI version does not yet support `httpUrl`, try `"url": "http://localhost:3003/mcp"` instead — some tools accept both keys for the same transport.

### 3. Cursor / Windsurf / Other IDEs

For any IDE or tool that reads a generic MCP JSON config:

```json
{
  "mcpServers": {
    "anaf-mock-server": {
      "url": "http://localhost:3003/mcp",
      "timeout": 30000
    }
  }
}
```

### How it Works (AI Workflow)

Once connected, your AI agent can perform tasks like:

1. **"Check if my upload request matches the official ANAF schema."** (Uses `get_swagger_spec`)
2. **"Generate a valid UBL XML for testing."** (Uses `generate_ubl_xml`)
3. **"List all available simulation headers."** (Uses `list_cheat_headers`)
4. **"Verify my rate-limit consumption for today."** (Uses `check_quota_usage`)

This drastically reduces the time needed to build robust e-Factura integrations by letting the AI "know" the API better than a human.

---

## Documentation

The project maintains a high-fidelity sync with official ANAF documentation.

- **[Manual Guides](docs/anaf/manual/)**: Human-readable summaries of API endpoints, OAuth2 registration, and the complete e-Factura integration workflow.
- **[Scraped Assets](docs/anaf/scraped/)**:
  - **Swagger JSONs**: `docs/anaf/scraped/technical/swagger/` contains automated OpenAPI extractions.
  - **Technical Specs**: `docs/anaf/scraped/technical/` contains text limit files.

### Automated ANAF Watchdog (Backblaze B2 & GitHub Actions)

To keep the repository lean, our scraper automatically offloads heavy ANAF assets (>200MB of PDFs and ZIPs) and its execution state directly to a **Backblaze B2** bucket.

Our daily GitHub Action `Check ANAF Documentation Parity` (`docs-sync.yml`) runs the scraper. If ANAF updates their API, the action uses `gh issue create` to automatically open a tracked Issue alerting maintainers to update the mock code. Furthermore, any Pull Request (`ci.yml`) will fail if code is pushed that is out-of-sync with ANAF's documentation.

To update the scraped documentation locally, run:

```bash
node scripts/anaf-scraper.mjs
```

### Simulating Edge Cases (Cheat Headers)

You can trigger specific ANAF error responses by sending custom HTTP headers with your requests. This is useful for testing your application's error-handling logic.

---

## Configuration Reference

The server behavior is controlled by environment variables. These can be set in a `.env` file or passed directly to Docker.

### Core Server Settings

### Simulation Settings

### Redis Settings (Required if store is `redis`)

### Bootstrap & Seeding

---

## Advanced Usage

### Runtime Configuration API

You can change the simulation behavior on the fly without restarting:

```bash
curl -X PATCH http://localhost:3003/simulation/config \
  -H "Content-Type: application/json" \
  -d '{ "latencyMs": 500, "errorRate": 10 }'
```

### Testing

- **Unit Tests:** `npm run test`
- **E2E Tests:** `npm run test:e2e` (Uses an in-memory server to verify full flows).

---

## Contributing

We welcome contributions from the community to make this simulator more robust! To maintain stability, our `master` branch is protected. Please follow this standard workflow:

1. **Open an Issue:** Before writing code, please open an issue using our **Bug Report** or **Feature Request** templates to discuss your proposed changes.
2. **Create a Branch:** Check out a new feature branch from `master` (e.g., `git checkout -b feat/new-spv-endpoint`).
3. **Commit & Push:** Make your changes and push them to your branch. Ensure your code passes all linting and local tests (`npm run test`).
4. **Open a Pull Request:** Submit a PR against the `master` branch using the provided PR template.
5. **CI/CD Validation:** Our automated CI pipeline will trigger to run tests and validate the Docker build. The CI status must be **green** before a maintainer can review and merge your PR.

---

_This tool is intended for development and testing only._

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