feat: AI-Powered Nutritionist Engine & Personalized Diet Recovery Plans

DEPLOYMENT_CHECKLIST.md

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+# Pre-Deployment Security Checklist
+
+**Version:** 2.0 - Enhanced App Lock & Profile System  
+**Date:** April 2, 2026  
+
+---
+
+## 🔒 Security Implementation Checklist
+
+### Core Features
+- [ ] PIN management implemented (4-digit, SHA256)
+- [ ] Biometric authentication working (fingerprint/face)
+- [ ] PIN as mandatory backup for biometric
+- [ ] Failed attempt tracking (5 max, 15-min lockout)
+- [ ] Forgot PIN recovery (email + password)
+- [ ] Multi-user data isolation (UID scoping)
+- [ ] Logout data cleanup implemented
+- [ ] App Lock popup shows on app start
+
+### File Verification
+- [ ] `profile_screen.dart` created ✓
+- [ ] `session_security_service.dart` created ✓
+- [ ] `secure_storage_service.dart` enhanced ✓
+- [ ] `security_service.dart` enhanced ✓
+- [ ] `app_lock_sheet.dart` enhanced ✓
+- [ ] All imports updated (no missing packages)
+- [ ] No compilation errors (`flutter analyze`)
+- [ ] No static analysis warnings
+
+### Documentation Complete
+- [ ] `SECURITY_COMPREHENSIVE.md` written (600+ lines)
+- [ ] `IMPLEMENTATION_SUMMARY.md` written
+- [ ] `QUICKSTART_SECURITY.md` written
+- [ ] Inline code comments added
+- [ ] Architecture diagrams included
+- [ ] Threat analysis documented
+- [ ] Best practices documented
+
+---
+
+## 📱 Device Testing Checklist
+
+### Android Testing
+- [ ] Fingerprint lock - tested on real device
+- [ ] PIN lock - tested multiple times
+- [ ] Wrong PIN 5x - lockout works
+- [ ] Lockout expired - test after 15 min
+- [ ] Biometric fallback to PIN - works
+- [ ] Multi-user - different users tried
+- [ ] Permission request - shows correctly
+- [ ] After uninstall/reinstall - data cleared
+- [ ] Biometric permission dialog appears
+- [ ] Camera/scanner prompt works (if using face)
+
+### iOS Testing
+- [ ] Face ID lock - tested on iPhone/iPad
+- [ ] Fingerprint lock - tested on Touch ID device
+- [ ] PIN lock - tested multiple times
+- [ ] Wrong PIN 5x - lockout works
+- [ ] Keychain integration - works
+- [ ] Info.plist permissions - configured
+- [ ] Face ID description shown - correct message
+- [ ] Touch ID prompt appears - correct message
+
+### Tablet & Large Screen
+- [ ] Profile layout - responsive on tablet
+- [ ] App Lock popup - positioned correctly
+- [ ] PIN pad - usable on large screens
+- [ ] Navigation - works on all orientations
+
+---
+
+## 🔐 Security Verification Checklist
+
+### Data Protection
+- [ ] PIN never logged (grep for "PIN: " - should find 0)
+- [ ] Password never stored locally (verified)
+- [ ] Biometric never stored (verified)
+- [ ] Hash comparison used (not decryption)
+- [ ] All sensitive data uses Secure Storage
+- [ ] UID-based key scoping in all methods
+- [ ] No sensitive data in SharedPreferences
+
+### Multi-User Isolation
+- [ ] User A's PIN doesn't unlock User B's app
+- [ ] User A's details don't show for User B
+- [ ] User A's orders don't show for User B
+- [ ] After logout, app lock still active
+- [ ] New user gets clean state
+- [ ] Uninstall clears all data (OS behavior)
+
+### Attempt Protection
+- [ ] 1st-4th attempts work normally
+- [ ] 5th attempt triggers lockout
+- [ ] Lockout message shows clearly
+- [ ] 15-minute cooldown enforced
+- [ ] Counter resets after successful auth
+- [ ] Failed attempts persist across app restarts
+- [ ] Biometric failures count toward lockout
+
+### Logout Flow
+- [ ] Logout confirmation dialog shown
+- [ ] `SecurityService.onUserLogout()` called
+- [ ] Firebase Auth signOut() executed
+- [ ] UI state cleared
+- [ ] Redirects to login
+- [ ] App lock status remains (for new user)
+
+---
+
+## 🧪 Functional Testing Checklist
+
+### Happy Path Scenarios
+- [ ] **Scenario 1:** Enable PIN → Close app → Reopen → Enter PIN → Unlock ✓
+- [ ] **Scenario 2:** Enable Biometric → Close app → Use fingerprint → Unlock ✓
+- [ ] **Scenario 3:** Wrong PIN once → Show error → Enter correct PIN → Unlock ✓
+- [ ] **Scenario 4:** Forgot PIN → Enter email + password → Reset PIN → New PIN works ✓
+- [ ] **Scenario 5:** Change password → Log out → Log back in → Old APP PIN still works ✓
+- [ ] **Scenario 6:** Add user details → Checkout in shop → Details autofill ✓
+- [ ] **Scenario 7:** Place order → View in My Orders → Cancel eligible order ✓
+- [ ] **Scenario 8:** Logout → Log in as different user → Biometric works for new user ✓
+
+### Edge Cases
+- [ ] **Case 1:** Lockout expires → Attempt counter resets → PIN works again ✓
+- [ ] **Case 2:** App force-closed during lock → Reopen → Lock persists ✓
+- [ ] **Case 3:** Device power off → Power on → Unlock needed ✓
+- [ ] **Case 4:** Biometric fails 3x → PIN pad shows → Works ✓
+- [ ] **Case 5:** Fingerprint changed → Device biometric → Lock still works (uses PIN backup) ✓
+- [ ] **Case 6:** Very long PIN length test → Should reject > 4 digits ✓
+- [ ] **Case 7:** Empty PIN entry → Should not submit ✓
+- [ ] **Case 8:** Rapid PIN attempts → Should rate-limit ✓
+
+### Integration Tests
+- [ ] **Flow 1:** Signup → Setup lock → Logout → Login → Lock works ✓
+- [ ] **Flow 2:** A's account → Set PIN → B's account → A's PIN doesn't work ✓
+- [ ] **Flow 3:** Change details → Logout → Login → Details still there ✓
+- [ ] **Flow 4:** View order → Logout → Login → Order still visible ✓
+- [ ] **Flow 5:** Biometric fails → PIN works → Biometric retries → Works ✓
+
+---
+
+## 📊 Code Quality Checklist
+
+### Linting & Analysis
+- [ ] Run `flutter analyze` - no errors
+- [ ] Run `dart format .` - code formatted
+- [ ] No unused imports
+- [ ] No unused variables
+- [ ] No hardcoded strings (use constants)
+- [ ] Null safety strictly enforced
+- [ ] All Future methods have proper error handling
+
+### Performance
+- [ ] PIN verification < 100ms
+- [ ] Biometric prompt < 1s
+- [ ] App Lock sheet renders < 500ms
+- [ ] Profile screen loads < 1s
+- [ ] Lockout check < 50ms
+- [ ] No memory leaks in StatefulWidget disposal
+
+### Code Review
+- [ ] Security review completed by 2+ developers
+- [ ] No security red flags identified
+- [ ] No deprecated API usage
+- [ ] Error messages don't leak info
+- [ ] Logging appropriate (no sensitive data)
+
+---
+
+## 📦 Build & Deployment Checklist
+
+### Android Build
+- [ ] `build.gradle.kts` has correct targeting
+- [ ] Firebase config included (`google-services.json`)
+- [ ] Biometric permission in `AndroidManifest.xml`
+- [ ] Key store configured for signing
+- [ ] Build test: `flutter build apk --release`
+- [ ] Size check: APK < 150MB
+- [ ] No build warnings
+
+### iOS Build
+- [ ] `Info.plist` has Face ID description
+- [ ] `Info.plist` has Biometric description
+- [ ] Pod dependencies resolved
+- [ ] Build test: `flutter build ios --release`
+- [ ] Code signing configured
+- [ ] Provisioning profile correct
+- [ ] No build warnings
+
+### Release Preparation
+- [ ] Version bumped in `pubspec.yaml`
+- [ ] Changelog updated with new features
+- [ ] Screenshots showing new profile screen
+- [ ] Release notes written
+- [ ] TestFlight build created (iOS)
+- [ ] Internal testing APK built (Android)
+- [ ] Beta testers invited
+
+---
+
+## 📱 User Experience Checklist
+
+### UI/UX
+- [ ] PIN pad is intuitive
+- [ ] Error messages are clear
+- [ ] Biometric prompt is friendly
+- [ ] Lock popup appears smoothly
+- [ ] Navigation between sections is smooth
+- [ ] No unexpected jumps/flickers
+- [ ] Dark mode supported (if app has it)
+- [ ] Accessibility features work (text size, voice)
+
+### Notifications & Messaging
+- [ ] "Too many attempts" warning shown
+- [ ] "Account locked 15 minutes" message clear
+- [ ] "PIN set successfully" confirmation shown
+- [ ] "Logout confirmation" dialog clear
+- [ ] Recovery success message shown
+- [ ] Error messages don't confuse users
+
+### Onboarding
+- [ ] New users can skip app lock
+- [ ] Setup is optional but encouraged
+- [ ] Help text guides users
+- [ ] Recovery options clearly explained
+- [ ] Privacy implications explained
+
+---
+
+## 📚 Documentation Checklist
+
+### Inline Documentation
+- [ ] All public methods have `///` docs
+- [ ] Complex logic has explanatory comments
+- [ ] Parameter descriptions complete
+- [ ] Return value descriptions complete
+- [ ] Example usage shown where helpful
+
+### Guide Documentation
+- [ ] SECURITY_COMPREHENSIVE.md - extensive (600+ lines) ✓
+- [ ] IMPLEMENTATION_SUMMARY.md - complete ✓
+- [ ] QUICKSTART_SECURITY.md - ready for developers ✓
+- [ ] README.md - updated with new features
+- [ ] Architecture diagrams - clear and accurate
+- [ ] Threat analysis - thorough
+
+### User Documentation
+- [ ] In-app help text for PIN setup
+- [ ] Recovery process documented
+- [ ] Privacy policy updated
+- [ ] FAQ section ready (if applicable)
+- [ ] Support contact info available
+
+---
+
+## 🔍 Security Audit Checklist
+
+### Code Security
+- [ ] No SQL injection risks (not applicable, using Firebase)
+- [ ] No XSS risks (not applicable, not web)
+- [ ] No CSRF risks (local app, not web)
+- [ ] Input validation on all forms
+- [ ] No buffer overflows (managed language)
+- [ ] No path traversal risks
+- [ ] Secure random used for any randomness
+- [ ] Cryptographic functions from trusted library
+
+### API Security
+- [ ] Firebase rules restrict unauthorized access
+- [ ] User can only access their own data
+- [ ] Rate limiting on auth endpoints
+- [ ] No API keys hardcoded
+- [ ] All endpoints use HTTPS/TLS
+
+### Storage Security
+- [ ] Sensitive data never in Shared Preferences
+- [ ] PIN hashed (not encryptable twice)
+- [ ] Keys scoped to user UID
+- [ ] No backup of Secure Storage to cloud
+- [ ] Proper cleanup on logout/uninstall
+
+---
+
+## 🚀 Pre-Release Testing
+
+### Smoke Tests (Quick Run-Through)
+```
+1. Open app → See splash (2 sec)
+2. Not locked → See home screen
+3. Go to Profile
+4. Enable PIN → Set 1234
+5. Close app completely
+6. Reopen → See lock popup
+7. Enter 1234 → Unlock works
+8. Go to Profile → See all sections
+9. Logout → See confirmation
+10. Confirm → Back to login
+```
+
+### Extended Testing (30 minutes)
+- Run through all happy path scenarios
+- Test 2-3 edge cases
+- Check all screens load
+- Verify biometric works (if device has it)
+- Test lockout by failing 5 times
+- Wait 15 min (or simulate time) and test reset
+- Try forgot PIN recovery
+
+---
+
+## 📋 Final Sign-Off
+
+### Developer
+- Name: `_________________`
+- Date: `_________________`
+- Notes: `_________________`
+
+### QA Lead
+- Name: `_________________`
+- Date: `_________________`
+- Notes: `_________________`
+
+### Security Reviewer
+- Name: `_________________`
+- Date: `_________________`
+- Notes: `_________________`
+
+### Product Manager
+- Name: `_________________`
+- Date: `_________________`
+- Approval: `[ ] Approved [ ] Approved with conditions [ ] Rejected`
+
+---
+
+## 🎯 Known Limitations & Reminders
+
+1. **Rooted/Jailbroken Devices**
+   - Secure Storage can potentially be compromised
+   - Mitigation: Use strong Firebase password
+   - Mitigation: Enable biometric as well
+   - User responsibility: Keep device secure
+
+2. **Lost Device**
+   - User should logout via Firebase account
+   - Passwords should be reset via forgot password
+   - This invalidates all sessions
+
+3. **Shared Devices**
+   - Users must logout explicitly
+   - App Lock PIN only protects the app
+   - Device PIN protects the whole device
+   - Recommend device-level password too
+
+4. **Session Restoration**
+   - Session data NOT preserved across app restarts
+   - User must re-authenticate via lock
+   - This is intentional for security
+
+5. **Uninstall Behavior**
+   - Secure Storage automatically cleared by OS
+   - No residual data remains
+   - New user gets clean state
+
+---
+
+## ✅ Ready for Production?
+
+Check this box only after ALL items above are completed:
+
+```
+[ ] All checklist items completed
+[ ] All tests passed
+[ ] All documentation written
+[ ] Code review approved
+[ ] Security audit completed
+[ ] Performance verified
+[ ] User experience validated
+[ ] Stakeholder approval obtained
+
+If checked: 🚀 READY FOR DEPLOYMENT
+```
+
+---
+
+**Document Version:** 2.0  
+**Last Updated:** April 2, 2026  
+**Next Review:** After first 1,000 users or 30 days, whichever is first
+