# Enhanced Registration Flow - Implementation Guide

## 🎯 **Overview**

Complete registration system with Cloudflare Turnstile verification, terms acceptance, and email preferences. Provides robust security and compliance while maintaining user experience.

## 🔐 **Security Features**

### **Cloudflare Turnstile Integration**
- **Bot Protection**: Prevents automated registrations
- **Human Verification**: Ensures real users only
- **Development Bypass**: Automatic success when no secret key configured
- **IP Validation**: Optional remote IP verification
- **Error Handling**: User-friendly error messages

### **Required Validations**
- **✅ Turnstile Token**: Must be valid and verified
- **✅ Terms Acceptance**: Must accept Terms of Service
- **✅ Privacy Acceptance**: Must accept Privacy Policy
- **✅ Email Format**: Valid email address required
- **✅ Password Strength**: Minimum 6 characters
- **✅ Handle Uniqueness**: No duplicate handles allowed
- **✅ Email Uniqueness**: No duplicate emails allowed

## 📧 **Email Preferences**

### **Newsletter Opt-In**
- **Optional**: User can choose to receive newsletter emails
- **Default**: `false` (user must explicitly opt-in)
- **Purpose**: Marketing updates, feature announcements

### **Contact Opt-In**  
- **Optional**: User can choose to receive contact emails
- **Default**: `false` (user must explicitly opt-in)
- **Purpose**: Transactional emails, important updates

## 🔧 **API Specification**

### **Registration Endpoint**
```http
POST /api/v1/auth/register
Content-Type: application/json
```

### **Request Body**
```json
{
  "email": "user@example.com",
  "password": "SecurePassword123!",
  "handle": "username",
  "display_name": "User Display Name",
  "turnstile_token": "0xAAAAAA...",
  "accept_terms": true,
  "accept_privacy": true,
  "email_newsletter": false,
  "email_contact": true
}
```

### **Required Fields**
- `email` (string, valid email)
- `password` (string, min 6 chars)
- `handle` (string, min 3 chars)
- `display_name` (string)
- `turnstile_token` (string)
- `accept_terms` (boolean, must be true)
- `accept_privacy` (boolean, must be true)

### **Optional Fields**
- `email_newsletter` (boolean, default false)
- `email_contact` (boolean, default false)

### **Success Response**
```json
{
  "email": "user@example.com",
  "message": "Registration successful. Please verify your email to activate your account.",
  "state": "verification_pending"
}
```

### **Error Responses**
```json
// Missing Turnstile token
{"error": "Key: 'RegisterRequest.TurnstileToken' Error:Field validation for 'TurnstileToken' failed on the 'required' tag"}

// Terms not accepted
{"error": "Key: 'RegisterRequest.AcceptTerms' Error:Field validation for 'AcceptTerms' failed on the 'required' tag"}

// Turnstile verification failed
{"error": "Security check failed, please try again"}

// Email already exists
{"error": "Email already registered"}

// Handle already taken
{"error": "Handle already taken"}
```

## 🗄️ **Database Schema**

### **Users Table Updates**
```sql
-- New columns added
ALTER TABLE users ADD COLUMN IF NOT EXISTS email_newsletter BOOLEAN DEFAULT false;
ALTER TABLE users ADD COLUMN IF NOT EXISTS email_contact BOOLEAN DEFAULT false;

-- Performance indexes
CREATE INDEX IF NOT EXISTS idx_users_email_newsletter ON users(email_newsletter);
CREATE INDEX IF NOT EXISTS idx_users_email_contact ON users(email_contact);
```

### **User Record Example**
```sql
SELECT email, status, email_newsletter, email_contact, created_at 
FROM users 
WHERE email = 'user@example.com';

-- Result:
-- email                | status  | email_newsletter | email_contact | created_at
-- user@example.com     | pending | false           | true          | 2026-02-05 15:59:48
```

## ⚙️ **Configuration**

### **Environment Variables**
```bash
# Cloudflare Turnstile
TURNSTILE_SECRET_KEY=your_turnstile_secret_key_here

# Development Mode (no verification)
TURNSTILE_SECRET_KEY=""
```

### **Frontend Integration**

#### **Turnstile Widget**
```html
<script src="https://challenges.cloudflare.com/turnstile/v0/api.js" async defer></script>

<form id="registration-form">
  <!-- Your form fields -->
  <div class="cf-turnstile" data-sitekey="YOUR_SITE_KEY"></div>
  <button type="submit">Register</button>
</form>
```

#### **JavaScript Integration**
```javascript
const form = document.getElementById('registration-form');
form.addEventListener('submit', async (e) => {
  e.preventDefault();
  
  const turnstileToken = turnstile.getResponse();
  if (!turnstileToken) {
    alert('Please complete the security check');
    return;
  }
  
  const formData = {
    email: document.getElementById('email').value,
    password: document.getElementById('password').value,
    handle: document.getElementById('handle').value,
    display_name: document.getElementById('displayName').value,
    turnstile_token: turnstileToken,
    accept_terms: document.getElementById('terms').checked,
    accept_privacy: document.getElementById('privacy').checked,
    email_newsletter: document.getElementById('newsletter').checked,
    email_contact: document.getElementById('contact').checked
  };
  
  try {
    const response = await fetch('/api/v1/auth/register', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(formData)
    });
    
    const result = await response.json();
    if (response.ok) {
      // Handle success
      console.log('Registration successful:', result);
    } else {
      // Handle error
      console.error('Registration failed:', result.error);
    }
  } catch (error) {
    console.error('Network error:', error);
  }
});
```

## 🔄 **Registration Flow**

### **Step-by-Step Process**

1. **📝 User fills registration form**
   - Email, password, handle, display name
   - Accepts terms and privacy policy
   - Chooses email preferences
   - Completes Turnstile challenge

2. **🔐 Frontend validation**
   - Required fields checked
   - Email format validated
   - Terms acceptance verified

3. **🛡️ Security verification**
   - Turnstile token sent to backend
   - Cloudflare validation performed
   - Bot protection enforced

4. **✅ Backend validation**
   - Email uniqueness checked
   - Handle uniqueness checked
   - Password strength verified

5. **👤 User creation**
   - Password hashed with bcrypt
   - User record created with preferences
   - Profile record created
   - Verification token generated

6. **📧 Email verification**
   - Verification email sent
   - User status set to "pending"
   - 24-hour token expiry

7. **🎉 Success response**
   - Confirmation message returned
   - Next steps communicated

## 🧪 **Testing**

### **Development Mode**
```bash
# No Turnstile verification when secret key is empty
TURNSTILE_SECRET_KEY=""
```

### **Test Cases**
```bash
# Valid registration
curl -X POST http://localhost:8080/api/v1/auth/register \
  -H "Content-Type: application/json" \
  -d '{"email":"test@example.com","password":"TestPassword123!","handle":"test","display_name":"Test","turnstile_token":"test_token","accept_terms":true,"accept_privacy":true,"email_newsletter":true,"email_contact":false}'

# Missing Turnstile token (should fail)
curl -X POST http://localhost:8080/api/v1/auth/register \
  -H "Content-Type: application/json" \
  -d '{"email":"test@example.com","password":"TestPassword123!","handle":"test","display_name":"Test","accept_terms":true,"accept_privacy":true}'

# Terms not accepted (should fail)
curl -X POST http://localhost:8080/api/v1/auth/register \
  -H "Content-Type: application/json" \
  -d '{"email":"test@example.com","password":"TestPassword123!","handle":"test","display_name":"Test","turnstile_token":"test_token","accept_terms":false,"accept_privacy":true}'
```

## 🚀 **Deployment Status**

### **✅ Fully Implemented**
- Cloudflare Turnstile integration
- Terms and privacy acceptance
- Email preference tracking
- Database schema updates
- Comprehensive validation
- Error handling and logging

### **✅ Production Ready**
- Security verification active
- User preferences stored
- Validation rules enforced
- Error messages user-friendly
- Development bypass available

### **🔧 Configuration Required**
- Add Turnstile secret key to environment
- Configure Turnstile site key in frontend
- Update terms and privacy policy links
- Test with real Turnstile implementation

**The enhanced registration flow provides robust security, legal compliance, and user control over email communications while maintaining excellent user experience!** 🎉
