digital-invoice-web — Independent Web-MCP Server

A standalone, multi-tenant Model Context Protocol (MCP) server that automates UI-only operations on Digital Invoicing Software using Playwright browser automation, FastAPI, and Central Auth token verification.

1. Architectural Highlights

• Zero Coupling: Operates completely independently from any backend invoicing API servers. No shared databases, imports, or session states.

• Strict Multi-Tenancy: Every tool call resolves the calling tenant strictly from the Central Auth JWT tenant_id claim. Browser contexts, cookies, and credentials are completely isolated per tenant.

• Session Caching: Playwright storage_state (cookies and localStorage) is encrypted at rest in Supabase (AES-256-GCM), reusing authenticated sessions to eliminate repetitive logins while falling back cleanly to UI login on session expiration.

• Concurrency & Resource Protection: Limits active concurrent browser contexts via an asyncio semaphore to protect VPS RAM and CPU.

Related MCP server: Salesforce MCP UI Automation

2. Registering Audience with Central Auth

This server sits behind the Central Auth server and verifies incoming JWT tokens using the official drop-in McpAuthMiddleware.

1. Open your Central Auth Server Admin Console (or API).

2. Register a new MCP Server:

   • Server Name: Digital Invoice Web MCP

   • Audience: digital-invoice-web (must match MCP_AUTH_AUDIENCE in your .env)

   • Server URL: https://web-mcp.<your-domain>/sse (or Streamable HTTP /mcp)

   • Required Token Claims: Ensure tenant_id is included in token payloads.

3. Keep the audience distinct from any other server (e.g. digital-invoice-api) to prevent cross-token usage.

3. Required Environment Variables

Copy .env.sample to .env and fill in every blank value before running — the server will refuse to start otherwise.

(Reference illustrative values can be inspected in .env.example).

Security-critical settings have no silent defaults; the server will fail fast at startup if any of these are missing, empty, or using placeholder values:

• MCP_AUTH_AUDIENCE — Must match exact audience registered in Central Auth.

• SUPABASE_URL — Supabase project API URL.

• SUPABASE_SERVICE_ROLE_KEY — Supabase backend service role key.

• ENCRYPTION_MASTER_KEY — 32-byte AES key generated via python scripts/generate_master_key.py.

Template (.env.sample):

# Server & Port
HOST=0.0.0.0
PORT=8000
LOG_LEVEL=INFO

# Central Auth (JWKS)
JWKS_URI=https://t91cvjn5boilhilaixggt5y9.s0226.digitalsofts.com/.well-known/jwks.json
MCP_AUTH_AUDIENCE=digital-invoice-web
REVOCATIONS_URI=https://t91cvjn5boilhilaixggt5y9.s0226.digitalsofts.com/revocations

# Supabase (Database & RLS)
SUPABASE_URL=https://your-project.supabase.co
SUPABASE_SERVICE_ROLE_KEY=your-supabase-service-role-key

# Cryptography (AES-256-GCM)
# Generate with: python scripts/generate_master_key.py
ENCRYPTION_MASTER_KEY=0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef
CURRENT_KEY_VERSION=1

# Playwright Browser Automation
PORTAL_BASE_URL=https://www.digitalinvoicingsoftware.com
HEADLESS=true
MAX_CONCURRENT_BROWSERS=3
NAVIGATION_TIMEOUT_MS=20000
ACTION_TIMEOUT_MS=15000
SESSION_TTL_HOURS=24

4. Supabase Database Setup

Run the SQL migration in your Supabase SQL Editor:

• File: supabase/migrations/001_initial_schema.sql

This script provisions:

1. tenants: Registered organizations and active kill-switch status.

2. tenant_credentials: AES-256-GCM encrypted portal login credentials.

3. tenant_sessions: Encrypted Playwright storage_state caching.

4. tool_call_logs: Execution audit and diagnostic error logging.

5. Row-Level Security (RLS) policies on all tables.

5. Onboarding a New Tenant's Credentials

Option A: Self-Service Web UI (Recommended)

New users can onboard directly through the self-service web interface without needing terminal access or manual tenant UUID handling:

1. Navigate to https://<deployed-domain>/onboarding (e.g. http://localhost:8000/onboarding).

2. Step 1 — Central Auth Authentication: Click "Sign in with Central Auth" (or enter a valid token). The server verifies your token and cryptographically resolves your tenant_id from claims. Manual tenant entry is prohibited to prevent tenant spoofing.

3. Step 2 — Credential Configuration & Test: Enter your Company Name, Portal Email, and Password (masked input, autocomplete="new-password"). Credentials are encrypted with AES-256-GCM. Click "Test Connection" to trigger an instant headless browser login check.

4. Step 3 & 4 — LLM Client Connect: Copy the MCP endpoint (https://<deployed-domain>/mcp), note that no API key is required (uses OAuth 2.1), and follow the step-by-step guides for Claude, Claude Code, ChatGPT, Cursor, and Antigravity.

Note: All onboarding pages include <meta name="robots" content="noindex, nofollow"> to prevent search engine indexing, and credential endpoints are rate-limited.

Option B: CLI Onboarding Utility (Admin/Developer Alternative)

# 1. Generate an encryption master key (if not already set in .env):
python scripts/generate_master_key.py

# 2. Add tenant credentials to Supabase via CLI:
python scripts/add_tenant.py \
  --tenant-id "a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11" \
  --company-name "Acme Logistics Inc" \
  --email "billing@acme.com" \
  --password "SecurePassword123!"

(You can also run python scripts/add_tenant.py without arguments for interactive masked input).

6. Local Development & Testing

# 1. Create and activate virtual environment
python -m venv .venv
source .venv/bin/activate  # Or on Windows: .venv\Scripts\activate

# 2. Install dependencies & Playwright browser
pip install -r requirements.txt
playwright install --with-deps chromium

# 3. Configure environment
# Copy .env.sample to .env and fill in every blank value before running — the server will refuse to start otherwise
cp .env.sample .env

# 4. Run automated tests
python -m pytest -v tests

# 5. Start local server
python main.py

Server endpoints:

• SSE Stream: http://localhost:8000/sse

• SSE Messages: http://localhost:8000/messages

• Streamable HTTP: http://localhost:8000/mcp

• Health Check: http://localhost:8000/health (unauthenticated)

7. Deployment on Coolify (VPS)

1. Create a new service in your Coolify dashboard: Application -> Dockerfile.

2. Point Coolify to this repository.

3. Set your custom subdomain (e.g. web-mcp.yourdomain.com).

4. Paste all environment variables from Section 3 into Coolify's Environment Variables tab.

5. Deploy. The Dockerfile automatically handles:

   • System Chromium dependencies (playwright install --with-deps chromium).

   • Unprivileged user permissions.

   • Built-in container health checks on /health.

8. Exposed MCP Tools

9. DOM Selectors & Discovery Workflow

All selectors are isolated in browser/selectors.py.

When testing with a live sandbox account:

1. Call tool_check_login_status to ensure login is operational.

2. If any element differs from candidate selectors, use tool_get_page_text and tool_take_screenshot to inspect the live markup.

3. Update browser/selectors.py with the exact attributes discovered.