# Auth0 Multi-Tenant Configuration Guide

This document provides step-by-step instructions for configuring Auth0 for the multi-tenant MotoVaultPro platform.

## Overview

The multi-tenant architecture requires:
- **Landing Page**: `motovaultpro.com` - Entry point with tenant selection
- **Admin Tenant**: `admin.motovaultpro.com` - Admin access to all tenants
- **Regular Tenants**: `{tenant-id}.motovaultpro.com` - Isolated tenant access
- **Signup Workflow**: Tenant-specific signup with admin approval

## Auth0 Application Configuration

### 1. Application Settings

**Application Type**: Single Page Application (SPA)

**Allowed Callback URLs**:
```
# Development URLs
http://localhost:3002/callback
http://admin.motovaultpro.local/callback
http://demo-tenant.motovaultpro.local/callback

# Production URLs  
https://motovaultpro.com/callback
https://admin.motovaultpro.com/callback
https://demo-tenant.motovaultpro.com/callback

# Add additional tenant subdomains as needed:
https://{tenant-id}.motovaultpro.com/callback
```

**Allowed Logout URLs**:
```
# Development
http://localhost:3002
http://admin.motovaultpro.local
http://demo-tenant.motovaultpro.local

# Production
https://motovaultpro.com
https://admin.motovaultpro.com  
https://demo-tenant.motovaultpro.com
https://{tenant-id}.motovaultpro.com
```

**Allowed Web Origins**:
```
# Development
http://localhost:3002
http://admin.motovaultpro.local:3000
http://demo-tenant.motovaultpro.local:3000

# Production
https://motovaultpro.com
https://admin.motovaultpro.com
https://demo-tenant.motovaultpro.com  
https://{tenant-id}.motovaultpro.com
```

### 2. JWT Configuration

**JWT Signature Algorithm**: RS256

**OIDC Conformant**: Enabled

### 3. Advanced Settings

**Grant Types**:
- Authorization Code
- Refresh Token
- Implicit (for development only)

## Auth0 Rules Configuration

### Rule 1: Add Tenant Context to JWT

Create a new Rule in Auth0 Dashboard > Auth Pipeline > Rules:

```javascript
function addTenantContext(user, context, callback) {
  const namespace = 'https://motovaultpro.com/';
  
  // Extract tenant_id from user metadata (set during signup)
  let tenantId = user.user_metadata && user.user_metadata.tenant_id;
  
  // For existing users without tenant metadata, default to admin
  if (!tenantId) {
    tenantId = 'admin';
    // Optionally update user metadata
    user.user_metadata = user.user_metadata || {};
    user.user_metadata.tenant_id = tenantId;
  }
  
  // Check signup status for non-admin tenants
  const signupStatus = user.user_metadata && user.user_metadata.signup_status;
  
  if (tenantId !== 'admin' && signupStatus !== 'approved') {
    // Block login for unapproved users
    return callback(new UnauthorizedError('Account pending approval'));
  }
  
  // Add tenant context to tokens
  context.idToken[namespace + 'tenant_id'] = tenantId;
  context.accessToken[namespace + 'tenant_id'] = tenantId;
  context.idToken[namespace + 'signup_status'] = signupStatus || 'approved';
  
  callback(null, user, context);
}
```

### Rule 2: Tenant-Specific User Metadata

```javascript
function setTenantMetadata(user, context, callback) {
  const namespace = 'https://motovaultpro.com/';
  
  // If this is a signup and connection is Username-Password-Authentication
  if (context.stats.loginsCount === 1 && context.connection === 'Username-Password-Authentication') {
    
    // Extract tenant from redirect_uri or state parameter
    const redirectUri = context.request.query.redirect_uri || '';
    const tenantMatch = redirectUri.match(/([a-z0-9-]+)\.motovaultpro\.(com|local)/);
    
    if (tenantMatch) {
      const tenantId = tenantMatch[1];
      
      // Set initial user metadata
      user.user_metadata = user.user_metadata || {};
      user.user_metadata.tenant_id = tenantId;
      
      // Set signup status (pending for regular tenants, approved for admin)
      user.user_metadata.signup_status = tenantId === 'admin' ? 'approved' : 'pending';
      
      // Update user metadata in Auth0
      auth0.users.updateUserMetadata(user.user_id, user.user_metadata);
    }
  }
  
  callback(null, user, context);
}
```

## Tenant Signup Flow Configuration

### 1. Signup URLs

**Tenant-Specific Signup**:
```
https://motovaultpro.com/signup/{tenant-id}
```

**Process**:
1. User visits tenant-specific signup URL
2. Landing page validates tenant exists
3. Redirects to Auth0 with tenant context
4. Auth0 Rule sets tenant_id in user metadata
5. User account created with status="pending"
6. Tenant admin receives notification
7. Admin approves/rejects via tenant management API

### 2. Auth0 Hosted Login Customization

Add custom CSS and JavaScript to Auth0 Universal Login to support tenant context:

**Custom CSS** (Dashboard > Universal Login > Advanced Options):
```css
.tenant-signup-info {
  background: #f8f9fa;
  padding: 15px;
  border-radius: 5px;
  margin-bottom: 20px;
  border-left: 4px solid #007bff;
}
```

**Custom JavaScript**:
```javascript
// Extract tenant from URL parameters
const urlParams = new URLSearchParams(window.location.search);
const redirectUri = urlParams.get('redirect_uri') || '';
const tenantMatch = redirectUri.match(/([a-z0-9-]+)\.motovaultpro\.(com|local)/);

if (tenantMatch && tenantMatch[1] !== 'admin') {
  const tenantName = tenantMatch[1].replace('-', ' ').toUpperCase();
  
  // Add tenant information to signup form
  const container = document.querySelector('.auth0-lock-header');
  if (container) {
    const info = document.createElement('div');
    info.className = 'tenant-signup-info';
    info.innerHTML = `
      <strong>Signing up for: ${tenantName}</strong><br>
      <small>Your account will require admin approval before you can access the system.</small>
    `;
    container.appendChild(info);
  }
}
```

## JWT Token Format

After successful authentication, JWT tokens will include:

**ID Token Claims**:
```json
{
  "sub": "auth0|user-123",
  "email": "user@example.com",
  "https://motovaultpro.com/tenant_id": "demo-tenant",
  "https://motovaultpro.com/signup_status": "approved",
  "iat": 1699123456,
  "exp": 1699127056
}
```

**Access Token Claims**:
```json
{
  "sub": "auth0|user-123", 
  "https://motovaultpro.com/tenant_id": "demo-tenant",
  "scope": "openid profile email",
  "iat": 1699123456,
  "exp": 1699127056
}
```

## Backend JWT Validation

Services should validate JWT tokens and extract tenant context:

```typescript
// Example JWT validation middleware
import jwt from 'jsonwebtoken';
import jwksClient from 'jwks-rsa';

const client = jwksClient({
  jwksUri: `https://${AUTH0_DOMAIN}/.well-known/jwks.json`
});

function getKey(header: any, callback: any) {
  client.getSigningKey(header.kid, (err, key) => {
    if (err) return callback(err);
    const signingKey = key.getPublicKey();
    callback(null, signingKey);
  });
}

export const validateJWT = (token: string): Promise<any> => {
  return new Promise((resolve, reject) => {
    jwt.verify(token, getKey, {
      audience: process.env.AUTH0_AUDIENCE,
      issuer: `https://${process.env.AUTH0_DOMAIN}/`,
      algorithms: ['RS256']
    }, (err, decoded) => {
      if (err) return reject(err);
      resolve(decoded);
    });
  });
};

// Extract tenant from validated JWT
export const getTenantFromToken = (decodedToken: any): string => {
  return decodedToken['https://motovaultpro.com/tenant_id'] || 'admin';
};
```

## Environment Variables

Configure the following environment variables for each service:

**Platform Services**:
```env
AUTH0_DOMAIN=your-domain.auth0.com
AUTH0_AUDIENCE=https://api.motovaultpro.com
```

**Landing Page Service**:
```env
VITE_AUTH0_DOMAIN=your-domain.auth0.com
VITE_AUTH0_CLIENT_ID=your-client-id
VITE_TENANTS_API_URL=http://mvp-platform-tenants:8000
```

**Admin/Tenant Services**:
```env
REACT_APP_AUTH0_DOMAIN=your-domain.auth0.com  
REACT_APP_AUTH0_CLIENT_ID=your-client-id
REACT_APP_AUTH0_AUDIENCE=https://api.motovaultpro.com
REACT_APP_TENANT_ID=admin  # or specific tenant ID
```

## Testing the Configuration

### 1. Test Admin Login
```bash
# Visit admin tenant
open http://admin.motovaultpro.local

# Should redirect to Auth0, login, then return to admin app
```

### 2. Test Tenant Signup
```bash  
# Visit tenant signup
open http://motovaultpro.local/signup/demo-tenant

# Complete signup, verify pending status
curl -H "Authorization: Bearer admin-token" \
  http://localhost:8001/api/v1/signups
```

### 3. Test Approval Workflow
```bash
# Approve signup
curl -X PUT -H "Authorization: Bearer admin-token" \
  http://localhost:8001/api/v1/signups/1/approve

# User should now be able to login to tenant
open http://demo-tenant.motovaultpro.local
```

## Production Deployment Notes

1. **SSL Certificates**: Ensure wildcard SSL certificate for `*.motovaultpro.com`
2. **DNS Configuration**: Set up wildcard DNS or individual A records per tenant
3. **Auth0 Environment**: Use production Auth0 tenant with proper security settings
4. **Rate Limiting**: Configure Auth0 rate limiting for signup endpoints
5. **Monitoring**: Set up Auth0 logs monitoring for failed login attempts

This configuration provides a secure, scalable multi-tenant authentication system with proper tenant isolation and admin approval workflows.