Feature: Two-Factor Authentication (2FA) Support

Overview

Add Two-Factor Authentication as an additional security layer for authenticated users in the Settings page.

Parent Issue

Part of #37 - Add Settings Page with Authentication and User Management

Requirements

2FA Setup Flow

• Add "Enable 2FA" option in Settings page (authenticated users only)
• QR code generation for TOTP apps (Google Authenticator, Authy, etc.)
• Manual secret key entry option as backup
• Verification step during setup (user enters code to confirm)
• Success confirmation with backup codes

2FA Management

• Display 2FA status (enabled/disabled) in Settings
• "Disable 2FA" option with password confirmation
• Regenerate backup codes functionality
• Clear visual indicators of 2FA protection status

Authentication Flow

• Prompt for 2FA code during sign-in (if enabled)
• Backup code entry option
• "Trust this device" option (optional)
• Proper error handling for invalid codes

Technical Implementation

• Integrate with Supabase Auth 2FA capabilities
• Update useAuth.ts composable for 2FA flows
• Add 2FA status to user profile state
• Implement TOTP token validation
• Generate and store backup codes securely

UI Components

• 2FA setup modal with QR code display
• 2FA management section in Settings
• Code input component for verification
• Backup codes display modal
• Status indicators and help text

Acceptance Criteria

• Users can enable 2FA from Settings page
• QR code works with major authenticator apps
• 2FA is required for sign-in when enabled
• Users can disable 2FA with proper verification
• Backup codes provide alternative access method
• Clean, intuitive UI following Ionic design patterns
• Proper error handling and user feedback
• Mobile-responsive implementation

Technical Notes

• Use Supabase's built-in MFA (Multi-Factor Authentication) features
• Follow TOTP standard (RFC 6238) for compatibility
• Implement secure backup code generation and storage
• Consider rate limiting for code verification attempts
• Ensure proper cleanup when 2FA is disabled

Priority

Medium - Security enhancement, not core functionality

Related Issues

• Add Settings Page with Authentication and User Management #37 - Parent issue for Settings page

🤖 Generated with Claude Code

Co-Authored-By: Claude noreply@anthropic.com