# OTP Verification System - Implementation Complete

## Overview
Implemented One-Time Password (OTP) email verification system for user registration. New users must verify their email address before they can log in.

## Implementation Date
2026-07-05

## Email Configuration
- **SMTP Server**: mail.wakelai.com
- **Port**: 465 (SSL)
- **Username**: welcome@wakelai.com
- **Password**: iXnG6D4I#9&{}-E=
- **From**: Wakel AI <welcome@wakelai.com>

## Database Changes

### New Fields Added to `users` Table:
```sql
otp_code              VARCHAR(10)          -- Hashed OTP code
otp_expires_at        TIMESTAMP           -- OTP expiration time
otp_attempts          INTEGER DEFAULT 0    -- Failed verification attempts
is_otp_verified       BOOLEAN DEFAULT false -- Email verification status
```

### Migration Applied:
- File: `/home/ashraffarid2010/wakelai.com/prisma/migrations/20260705_add_otp_fields/migration.sql`
- Existing users marked as verified automatically

## Files Created

### Backend Services
1. `/home/ashraffarid2010/wakelai.com/src/lib/email-service.ts` - Nodemailer wrapper for SMTP
2. `/home/ashraffarid2010/wakelai.com/src/lib/otp-service.ts` - OTP generation/validation logic

### API Endpoints
3. `/home/ashraffarid2010/wakelai.com/src/app/api/auth/send-otp/route.ts` - Generate and send OTP
4. `/home/ashraffarid2010/wakelai.com/src/app/api/auth/verify-otp/route.ts` - Validate OTP code

### Frontend
5. `/home/ashraffarid2010/wakelai.com/src/app/register/verify-otp/page.tsx` - OTP verification UI
6. `/home/ashraffarid2010/wakelai.com/src/components/auth/otp-verification-form.tsx` - Reusable OTP form

### Files Modified
7. `/home/ashraffarid2010/wakelai.com/src/app/api/register/route.ts` - Updated to send OTP after registration
8. `/home/ashraffarid2010/wakelai.com/src/components/auth/register-form.tsx` - Redirects to OTP page
9. `/home/ashraffarid2010/wakelai.com/src/components/auth/login-form.tsx` - Blocks unverified users
10. `/home/ashraffarid2010/wakelai.com/src/lib/auth.ts` - Added OTP verification check in NextAuth
11. `/home/ashraffarid2010/wakelai.com/prisma/schema.prisma` - Added OTP fields
12. `/home/ashraffarid2010/wakelai.com/.env` - Added SMTP and OTP configuration

## User Flow

### Registration:
1. User fills registration form (username, email, password)
2. Account created with `email_verified: false`, `is_otp_verified: false`
3. 6-digit OTP generated and emailed to user
4. User redirected to `/register/verify-otp?email=...`
5. User enters OTP code
6. On success: `is_otp_verified: true`, redirected to login

### Login:
1. User enters email/password
2. System checks `is_otp_verified` field
3. If NOT verified: Error message "Please verify your email first" with resend option
4. If verified: Normal authentication proceeds

## Security Features

### OTP Configuration:
- **Length**: 6 digits
- **Expiration**: 10 minutes
- **Max Attempts**: 3 per OTP code
- **Max Requests**: 3 per hour per email

### Rate Limiting:
- In-memory rate limiter (production should use Redis)
- Tracks OTP requests per email
- Resets after 1 hour

### Password Hashing:
- OTP codes hashed with bcrypt (salt rounds: 10)
- Plain OTP only used for sending email
- Never stored or logged

## Environment Variables Added

```env
# SMTP Configuration
SMTP_HOST=mail.wakelai.com
SMTP_PORT=465
SMTP_SECURE=true
SMTP_USER=welcome@wakelai.com
SMTP_PASSWORD=iXnG6D4I#9&{}-E=
SMTP_FROM_NAME=Wakel AI
SMTP_FROM_EMAIL=welcome@wakelai.com

# OTP Settings
OTP_LENGTH=6
OTP_EXPIRY_MINUTES=10
OTP_MAX_ATTEMPTS=3
OTP_MAX_PER_HOUR=3
```

## Dependencies Installed
```json
{
  "nodemailer": "^7.0.13",
  "@types/nodemailer": "^6.4.14"
}
```

## Testing Checklist

- [x] Database migration applied successfully
- [x] Prisma client regenerated
- [x] Next.js build completes without errors
- [ ] SMTP connection test (requires runtime with env loaded)
- [ ] End-to-end test: Register → Receive OTP → Verify → Login
- [ ] Test expired OTP handling
- [ ] Test invalid OTP handling (3 attempts)
- [ ] Test rate limiting
- [ ] Test resend OTP functionality
- [ ] Test login with unverified user

## Known Limitations

1. **Rate Limiting**: Currently uses in-memory Map. For production with multiple servers, migrate to Redis.

2. **OTP Storage**: Hash stored in database. Consider using Redis with TTL for automatic cleanup.

3. **Email Delivery**: Depends on SMTP server availability. Add retry logic or queue system for production.

## Next Steps for Production

1. **Test Email Delivery**: Verify SMTP connection works in production environment
2. **Monitor Email Logs**: Add logging for email delivery failures
3. **Add Redis**: Replace in-memory rate limiting with Redis
4. **Add Webhook**: Consider webhook for email delivery status
5. **Admin Panel**: Add ability to manually verify users or resend OTP

## Troubleshooting

### OTP Not Sending:
1. Check SMTP credentials in `.env`
2. Verify SMTP server is accessible
3. Check logs: `docker logs <container> | grep -i otp`

### Build Errors:
- Ensure `nodemailer` is installed: `npm install nodemailer@7.0.13 --legacy-peer-deps`
- Regenerate Prisma client: `npx prisma generate`

### Database Issues:
- Migration file: `/home/ashraffarid2010/wakelai.com/prisma/migrations/20260705_add_otp_fields/migration.sql`
- Apply manually if needed via PostgreSQL

## Rollback Plan

If issues occur, rollback steps:

1. Remove OTP fields from database:
```sql
ALTER TABLE users DROP COLUMN otp_code;
ALTER TABLE users DROP COLUMN otp_expires_at;
ALTER TABLE users DROP COLUMN otp_attempts;
ALTER TABLE users DROP COLUMN is_otp_verified;
```

2. Revert code changes:
```bash
git checkout -- src/lib/auth.ts src/components/auth/
```

3. Remove new files:
```bash
rm src/lib/email-service.ts src/lib/otp-service.ts
rm -rf src/app/api/auth/send-otp src/app/api/auth/verify-otp
rm -rf src/app/register/verify-otp
rm src/components/auth/otp-verification-form.tsx
```