# Iframe SSO Authentication System - API Documentation

## Overview
This system enables secure SSO authentication for Iframe embeds from third-party websites. It validates source domains against a whitelist and generates reusable API keys for seamless user authentication.

## Architecture

```
Frontend (Edlink Payload)
    ↓
Check Login Status (/auth/iframe/status)
    ↓
    ├─ IF Logged In → Render Iframe
    │
    └─ IF NOT Logged In:
        ├─ Request API Key (/auth/api-key/generate)
        ├─ Whitelist Validation
        ├─ Verify API Key (/auth/api-key/verify)
        ├─ Get JWT Token
        ├─ Set Secure Cookie
        └─ Render Iframe
```

## Endpoints

### 1. Check Login Status
**Endpoint:** `GET /v1/auth/iframe/status`

**Description:** Check if user is already logged in via JWT token

**Headers:**
```
Authorization: Bearer <jwt_token>
```

**Response (200):**
```json
{
  "is_logged_in": true,
  "user_token": "user-uuid-token",
  "email": "user@example.com",
  "name": "John Doe"
}
```

**Errors:**
- `401 Unauthorized` - No valid token or inactive user

---

### 2. Generate API Key
**Endpoint:** `POST /v1/auth/api-key/generate`

**Description:** Generate API key with whitelist validation

**Request Body:**
```json
{
  "email": "user@example.com",
  "username": "johndoe",
  "phone": "+62812345678",
  "name": "John Doe",
  "identity_number": "1234567890123456",
  "source_domain": "https://abdanhafidz.github.io/edlink-simulation"
}
```

**Response (200):**
```json
{
  "api_key": "generated-api-key-here",
  "message": "API key generated successfully"
}
```

**Errors:**
- `401 Unauthorized` - Source domain not whitelisted
- `400 Bad Request` - Invalid payload data

---

### 3. Verify API Key & Login
**Endpoint:** `POST /v1/auth/api-key/verify`

**Query Parameters:**
- `api_key` (string, required) - The API key from step 2

**Response (200):**
```json
{
  "message": "Login successful",
  "access_token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
  "expires_at": "2024-05-20 22:50:00"
}
```

**Cookies Set:**
- `access_token` (HttpOnly, Secure, SameSite=Lax)

**Errors:**
- `401 Unauthorized` - Invalid API key

---

## Whitelist Management (Admin)

### Add Domain to Whitelist
**Endpoint:** `POST /v1/auth/whitelist`

**Request Body:**
```json
{
  "source_type": "domain",
  "value": "https://abdanhafidz.github.io/edlink-simulation",
  "description": "Edlink Simulation Platform",
  "is_active": true
}
```

**Supported Formats:**
- Exact domain: `example.com`, `https://example.com`
- Wildcard subdomain: `*.example.com`, `https://*.example.com`
- Full URL: `https://abdanhafidz.github.io/edlink-simulation`

---

## Security Features

1. **Whitelist Validation**
   - All source domains must be whitelisted before API key generation
   - Supports exact matching, wildcard subdomains, and full URLs
   - Case-insensitive domain matching

2. **API Key Security**
   - API keys are hashed before storage (SHA-256)
   - Plain API key only returned once during generation
   - Reusable keys for convenient third-party integration
   - Can be revoked at any time

3. **JWT Token Security**
   - Tokens stored in secure HTTP-only cookies
   - Auto-expire after 1 hour
   - Validated on every protected request
   - Secure flag set for HTTPS-only transmission

4. **User Creation**
   - Auto-created users for new third-party users
   - Unique user_token per user
   - Email uniqueness enforced
   - Default secure password (not shared with frontend)

## Implementation Flow (Frontend Example)

```typescript
// Step 1: Check if already logged in
async function checkLoginStatus() {
  const response = await fetch('/v1/auth/iframe/status', {
    headers: {
      'Authorization': `Bearer ${getCookie('access_token')}`
    }
  });
  
  if (response.ok) {
    renderIframe(); // Already logged in
    return;
  }
  
  // Not logged in, proceed to Step 2
  generateAndVerifyAPIKey();
}

// Step 2: Generate API Key
async function generateAndVerifyAPIKey() {
  const apiKeyResponse = await fetch('/v1/auth/api-key/generate', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      email: userData.email,
      username: userData.username,
      phone: userData.phone,
      name: userData.name,
      identity_number: userData.identityNumber,
      source_domain: window.location.origin
    })
  });
  
  const apiKeyData = await apiKeyResponse.json();
  const apiKey = apiKeyData.api_key;
  
  // Step 3: Verify API Key & Get JWT
  await fetch(`/v1/auth/api-key/verify?api_key=${apiKey}`, {
    method: 'POST'
  });
  
  // JWT token is now in secure cookie
  renderIframe();
}

// Helper: Get cookie value
function getCookie(name) {
  const value = `; ${document.cookie}`;
  const parts = value.split(`; ${name}=`);
  if (parts.length === 2) return parts.pop().split(';').shift();
}
```

## Database Schema

### Whitelist Table
```sql
CREATE TABLE whitelist (
  id INT PRIMARY KEY AUTO_INCREMENT,
  created_at DATETIME,
  updated_at DATETIME,
  source_type VARCHAR(50),
  value VARCHAR(255) UNIQUE INDEX,
  description VARCHAR(255),
  is_active BOOLEAN DEFAULT TRUE
);
```

### API Key Table
```sql
CREATE TABLE api_key (
  id INT PRIMARY KEY AUTO_INCREMENT,
  created_at DATETIME,
  updated_at DATETIME,
  user_token VARCHAR(255) INDEX,
  api_key_hash VARCHAR(255) UNIQUE,
  source_domain VARCHAR(255) INDEX,
  is_active BOOLEAN DEFAULT TRUE
);
```

## Environment Requirements

No additional environment variables needed beyond existing FastAPI setup.

## Testing

Run migration:
```bash
alembic upgrade head
```

Run tests:
```bash
pytest tests/
```