Add security checklist and documentation index

Co-authored-by: animator <615622+animator@users.noreply.github.com>

Author: Copilot

SECURITY_CHECKLIST.md

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+# Security Vulnerability Resolution Checklist
+
+This checklist tracks the remediation of identified security vulnerabilities in API Dash.
+
+---
+
+## 🔴 Critical Priority (Immediate Action Required)
+
+### 1. Unencrypted Credential Storage
+- [ ] Install `flutter_secure_storage` and `encrypt` packages
+- [ ] Implement `SecureHiveHandler` class
+- [ ] Add encryption for environment secrets
+- [ ] Encrypt OAuth2 credentials
+- [ ] Add encryption for API keys in Hive storage
+- [ ] Create data migration script for existing users
+- [ ] Test encryption/decryption performance
+- [ ] Update user documentation
+- [ ] **Estimated Time:** 3-5 days
+- [ ] **Assigned To:** ____________
+- [ ] **Target Date:** ____________
+
+### 2. JavaScript Code Injection
+- [ ] Implement `SecureJsRuntimeNotifier` class
+- [ ] Add script validation before execution
+- [ ] Block dangerous JavaScript patterns
+- [ ] Implement execution timeout (5 seconds max)
+- [ ] Add user consent dialog for script execution
+- [ ] Implement output sanitization
+- [ ] Add security warnings in UI
+- [ ] Test with malicious script samples
+- [ ] **Estimated Time:** 4-6 days
+- [ ] **Assigned To:** ____________
+- [ ] **Target Date:** ____________
+
+### 3. Plaintext OAuth2 Token Storage
+- [ ] Implement `SecureOAuth2Storage` class
+- [ ] Encrypt OAuth2 access tokens
+- [ ] Encrypt OAuth2 refresh tokens
+- [ ] Remove plaintext credential files
+- [ ] Update `oauth2_utils.dart` to use secure storage
+- [ ] Add automatic token rotation
+- [ ] Test token expiration handling
+- [ ] **Estimated Time:** 2-3 days
+- [ ] **Assigned To:** ____________
+- [ ] **Target Date:** ____________
+
+---
+
+## 🟠 High Priority (Urgent - Within 2 Weeks)
+
+### 4. Input Validation in Code Generation
+- [ ] Implement `SecureCodeGenerator` class
+- [ ] Add JavaScript string escaping
+- [ ] Add HTML escaping for comments
+- [ ] Add URL validation and sanitization
+- [ ] Validate field names (alphanumeric only)
+- [ ] Add security notices to generated code
+- [ ] Test with injection payloads
+- [ ] **Estimated Time:** 3-4 days
+- [ ] **Assigned To:** ____________
+- [ ] **Target Date:** ____________
+
+### 5. Digest Authentication Replay Protection
+- [ ] Add server nonce validation
+- [ ] Implement timestamp in nonce
+- [ ] Add nonce expiration checking
+- [ ] Implement mutual authentication
+- [ ] Add replay attack detection
+- [ ] Test against replay attack scenarios
+- [ ] **Estimated Time:** 2-3 days
+- [ ] **Assigned To:** ____________
+- [ ] **Target Date:** ____________
+
+### 6. ReDoS Protection in Environment Variables
+- [ ] Implement `SecureEnvVarUtils` class
+- [ ] Add regex complexity limits
+- [ ] Add input length validation
+- [ ] Implement alternative string matching for large sets
+- [ ] Validate variable names before regex
+- [ ] Test with ReDoS attack patterns
+- [ ] **Estimated Time:** 2 days
+- [ ] **Assigned To:** ____________
+- [ ] **Target Date:** ____________
+
+### 7. Remove Debug Logging of Sensitive Data
+- [ ] Audit all `debugPrint` statements
+- [ ] Remove token logging in `oauth2_utils.dart`
+- [ ] Remove credential logging in `handle_auth.dart`
+- [ ] Replace with structured logging
+- [ ] Use `logging` package
+- [ ] Add log level filtering
+- [ ] Test logging in production build
+- [ ] **Estimated Time:** 1 day
+- [ ] **Assigned To:** ____________
+- [ ] **Target Date:** ____________
+
+### 8. Certificate Validation
+- [ ] Research certificate pinning libraries
+- [ ] Implement certificate pinning for sensitive APIs
+- [ ] Add custom certificate validation
+- [ ] Add self-signed certificate warnings
+- [ ] Implement certificate transparency checks
+- [ ] Add user control over certificate validation
+- [ ] **Estimated Time:** 3-4 days
+- [ ] **Assigned To:** ____________
+- [ ] **Target Date:** ____________
+
+### 9. Deprecate Plaintext OAuth1 Signature
+- [ ] Add deprecation warnings in UI
+- [ ] Show security notice for plaintext selection
+- [ ] Force HTTPS when plaintext is used
+- [ ] Add documentation warnings
+- [ ] Recommend alternative methods
+- [ ] **Estimated Time:** 1 day
+- [ ] **Assigned To:** ____________
+- [ ] **Target Date:** ____________
+
+### 10. Rate Limiting for OAuth Flows
+- [ ] Implement rate limiter class
+- [ ] Add exponential backoff for retries
+- [ ] Limit concurrent auth attempts
+- [ ] Add failure tracking
+- [ ] Implement temporary lockouts
+- [ ] Test rate limiting effectiveness
+- [ ] **Estimated Time:** 2-3 days
+- [ ] **Assigned To:** ____________
+- [ ] **Target Date:** ____________
+
+---
+
+## 🟡 Medium Priority (Within 1 Month)
+
+### 11. Improve Random Number Generation
+- [ ] Research platform-specific secure RNG
+- [ ] Add entropy source mixing
+- [ ] Increase nonce size to 32 bytes
+- [ ] Implement nonce uniqueness validation
+- [ ] Test RNG quality
+- [ ] **Estimated Time:** 2 days
+- [ ] **Assigned To:** ____________
+- [ ] **Target Date:** ____________
+
+### 12. Error Message Sanitization
+- [ ] Audit all error messages
+- [ ] Implement error sanitization helper
+- [ ] Use generic user-facing messages
+- [ ] Log detailed errors securely
+- [ ] Add structured error logging
+- [ ] **Estimated Time:** 2 days
+- [ ] **Assigned To:** ____________
+- [ ] **Target Date:** ____________
+
+### 13. Configurable Timeouts
+- [ ] Make OAuth timeout configurable
+- [ ] Add timeout settings to UI
+- [ ] Implement adaptive timeouts
+- [ ] Add user timeout extension option
+- [ ] **Estimated Time:** 1 day
+- [ ] **Assigned To:** ____________
+- [ ] **Target Date:** ____________
+
+---
+
+## 🟢 Low Priority (Future Release)
+
+### 14. Input Length Limits
+- [ ] Add max length to URL fields
+- [ ] Add max length to header fields
+- [ ] Add max length to body fields
+- [ ] Add UI feedback for oversized inputs
+- [ ] Implement chunking for large data
+- [ ] **Estimated Time:** 1 day
+- [ ] **Assigned To:** ____________
+- [ ] **Target Date:** ____________
+
+---
+
+## Testing & Validation
+
+### Security Testing
+- [ ] Create unit tests for encryption
+- [ ] Create tests for script validation
+- [ ] Test input validation thoroughly
+- [ ] Perform penetration testing
+- [ ] Run static code analysis
+- [ ] Test with OWASP ZAP or similar tools
+- [ ] Perform fuzzing on inputs
+- [ ] Test rate limiting effectiveness
+- [ ] **Estimated Time:** 5-7 days
+- [ ] **Assigned To:** ____________
+- [ ] **Target Date:** ____________
+
+### Code Review
+- [ ] Review all security-related code changes
+- [ ] Security team code review
+- [ ] External security audit (recommended)
+- [ ] **Estimated Time:** 2-3 days
+- [ ] **Assigned To:** ____________
+- [ ] **Target Date:** ____________
+
+### Documentation
+- [ ] Update security documentation
+- [ ] Create user security guide
+- [ ] Document encryption mechanisms
+- [ ] Add security best practices guide
+- [ ] Update API documentation
+- [ ] **Estimated Time:** 2-3 days
+- [ ] **Assigned To:** ____________
+- [ ] **Target Date:** ____________
+
+---
+
+## Compliance & Certification
+
+### Standards Compliance
+- [ ] Verify OWASP Top 10 compliance
+- [ ] Check OAuth 2.1 security BCP compliance
+- [ ] Review GDPR requirements
+- [ ] Consider SOC 2 requirements
+- [ ] **Estimated Time:** 3-5 days
+- [ ] **Assigned To:** ____________
+- [ ] **Target Date:** ____________
+
+### Security Certification
+- [ ] Consider security certification
+- [ ] Prepare security disclosure policy
+- [ ] Set up vulnerability reporting process
+- [ ] Create security incident response plan
+- [ ] **Estimated Time:** 5-10 days
+- [ ] **Assigned To:** ____________
+- [ ] **Target Date:** ____________
+
+---
+
+## Deployment Plan
+
+### Pre-Release Checklist
+- [ ] All critical vulnerabilities fixed
+- [ ] All high priority vulnerabilities fixed
+- [ ] Security tests passing
+- [ ] Code review complete
+- [ ] Documentation updated
+- [ ] Migration scripts tested
+- [ ] User communication prepared
+- [ ] **Target Release Date:** ____________
+
+### Release Notes
+- [ ] Document security improvements
+- [ ] List breaking changes
+- [ ] Provide migration guide
+- [ ] Highlight new security features
+- [ ] Add security recommendations for users
+
+### Post-Release
+- [ ] Monitor for security issues
+- [ ] Track user feedback
+- [ ] Schedule security review (3 months)
+- [ ] Plan next security audit
+- [ ] Update vulnerability database
+
+---
+
+## Resource Requirements
+
+### Team
+- **Security Lead:** ____________ (20-30 hours)
+- **Backend Developer:** ____________ (40-60 hours)
+- **Frontend Developer:** ____________ (20-30 hours)
+- **QA Engineer:** ____________ (30-40 hours)
+- **Technical Writer:** ____________ (10-15 hours)
+
+### Tools & Services
+- [ ] `flutter_secure_storage` license: Free/MIT
+- [ ] `encrypt` package license: BSD-3-Clause
+- [ ] Security testing tools (OWASP ZAP, Burp Suite)
+- [ ] External security audit (optional): $$$
+- [ ] Code analysis tools subscription
+
+### Timeline Summary
+- **Critical Fixes:** 2-3 weeks
+- **High Priority:** 3-4 weeks
+- **Medium Priority:** 4-6 weeks
+- **Low Priority:** 6-8 weeks
+- **Testing & Documentation:** 2-3 weeks
+- **Total Estimated Time:** 8-12 weeks
+
+---
+
+## Progress Tracking
+
+### Week 1-2: Critical Fixes
+- [ ] Start: ____________
+- [ ] Completion: ____________
+- [ ] Status: ____________
+
+### Week 3-5: High Priority
+- [ ] Start: ____________
+- [ ] Completion: ____________
+- [ ] Status: ____________
+
+### Week 6-8: Medium Priority & Testing
+- [ ] Start: ____________
+- [ ] Completion: ____________
+- [ ] Status: ____________
+
+### Week 9-12: Low Priority & Documentation
+- [ ] Start: ____________
+- [ ] Completion: ____________
+- [ ] Status: ____________
+
+---
+
+## Sign-offs
+
+### Technical Lead
+- Name: ____________
+- Date: ____________
+- Signature: ____________
+
+### Security Lead
+- Name: ____________
+- Date: ____________
+- Signature: ____________
+
+### Product Manager
+- Name: ____________
+- Date: ____________
+- Signature: ____________
+
+---
+
+## Notes & Updates
+
+| Date | Update | By |
+|------|--------|-----|
+| 2025-10-11 | Initial checklist created | Security Assessment Team |
+|  |  |  |
+|  |  |  |
+
+---
+
+**Document Version:** 1.0  
+**Last Updated:** 2025-10-11  
+**Next Review:** Weekly until completion