---
title: LicenseManager
emoji: 🔑
colorFrom: green
colorTo: blue
sdk: docker
pinned: false
app_port: 7860
---

# LicenseManager

A full-stack B2B license management system built with **Go + React**.  
Manages clients, devices, products, subscriptions, and cryptographic license generation (RSA-SHA256).

## Stack

| Layer | Technology |
|---|---|
| Backend | Go 1.23 + Gin |
| Frontend | React 19 + Tailwind CSS v4 + Vite |
| Database | PostgreSQL 16 |
| Auth | JWT (HS256) + bcrypt |
| License Signing | RSA-2048 / SHA-256 |
| Email Alerts | SMTP (Zoho / any SMTP provider) |

---

## Deploying to Hugging Face Spaces

### Step 1 — Get a free PostgreSQL database

[Neon.tech](https://neon.tech) gives you a free serverless PostgreSQL.  
After signing up, create a project and copy the **connection string** — you'll need the individual parts below.

### Step 2 — Create a new Hugging Face Space (Docker type)

1. Go to [huggingface.co/new-space](https://huggingface.co/new-space)
2. Choose **Docker** as the SDK — NOT Static, NOT Gradio
3. Set visibility to Public or Private
4. Click **Create Space**

### Step 3 — Set Secrets in the Space settings

Go to your Space → **Settings** → **Repository secrets** and add:

| Secret name | Value | Notes |
|---|---|---|
| `DB_HOST` | `ep-xxx.us-east-2.aws.neon.tech` | From Neon dashboard |
| `DB_PORT` | `5432` | |
| `DB_USER` | `neondb_owner` | From Neon connection string |
| `DB_PASSWORD` | `your-neon-password` | Mark as Secret |
| `DB_NAME` | `neondb` | From Neon dashboard |
| `DB_SSLMODE` | `require` | **Required for Neon** — connection defaults to `disable` if unset, which Neon rejects |
| `JWT_SECRET` | `<64-char random string>` | Generate: `openssl rand -hex 32` |
| `MAIL_HOST` | `smtp.zoho.com` | Optional — leave blank to disable email |
| `MAIL_PORT` | `587` | Optional |
| `MAIL_USERNAME` | `you@zoho.com` | Optional |
| `MAIL_PASSWORD` | `your-zoho-app-password` | Optional — mark as Secret |

### Step 4 — Log in

Once running, open your Space URL. The default admin credentials are:

| Field | Value |
|---|---|
| Email | `admin@futurealgos.com` |
| Password | `changeme` |

**Change the password immediately** after first login.

---

## CI/CD — Auto-deploy from GitHub

Every push to `main` on GitHub automatically deploys to your Hugging Face Space.

### How it works

```
git push origin main
       │
       ▼
GitHub Actions — build-check (go build + npm run build)
       │  passes
       ▼
GitHub Actions — deploy (git push to HF Space)
       │
       ▼
HF Spaces detects push → builds Dockerfile → redeploys (~5 min)
```

### One-time setup

**1. Get a Hugging Face write token**

Go to [huggingface.co/settings/tokens](https://huggingface.co/settings/tokens) → **New token** → **Write** access.

**2. Add to GitHub → Settings → Secrets and variables → Actions**

| Type | Name | Value |
|---|---|---|
| Secret | `HF_TOKEN` | your HF write token |
| Variable | `HF_USERNAME` | your HF username e.g. `futurealgos` |
| Variable | `HF_SPACE_NAME` | your Space name e.g. `licensemanager` |

**3. Push**

```bash
git add .
git commit -m "ci: add deploy pipeline"
git push origin main
```

GitHub Actions tab will show **Build check** then **Deploy to HF Spaces**. First deploy takes ~5 min on HF's side.

---

## Local Development

**Option A — Docker (PostgreSQL included, zero setup):**

```bash
# from the repo root
docker compose up --build
# App → http://localhost:8080
```

**Option B — without Docker (frontend hot reload):**

```bash
# Terminal 1 — backend
cd Apps/licensemanagerApp/backend
go run ./cmd/server

# Terminal 2 — frontend
cd Apps/licensemanagerApp/frontend
npm install && npm run dev
# http://localhost:5173  (proxies /api → :8080)
```

### PORT behaviour

| Environment | PORT | How it's set |
|---|---|---|
| Local (no Docker) | `8080` | default in code |
| Local Docker | `8080` | `docker-compose.yml` env |
| HF Spaces | `7860` | `Dockerfile` ENV |

---