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📋 Changelog - MacOS to Linux SCP

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[2.0.0] - 2025-08-19

🎉 Major Release: Transfer Cancellation System

This release introduces comprehensive transfer cancellation functionality, resolving the critical issue where transfers would get stuck at specific percentages indefinitely.

✨ Added

🛑 Transfer Cancellation System

  • Cancel Transfer API Endpoint (/api/cancel-transfer)

    • Immediately stops ongoing transfers
    • Clears progress tracking data
    • Marks transfer as cancelled in connection state
    • Returns proper success/error responses

  • Frontend Cancel Button Integration

    • Enhanced cancelTransfer() method with API integration
    • Proper cleanup of progress monitoring intervals
    • User-friendly cancellation confirmation messages
    • Immediate UI feedback on cancellation

🔍 Stuck Transfer Detection

  • Automatic Detection Algorithm

    • Monitors progress every 5 seconds (200ms intervals)
    • Detects transfers with no progress for 2+ minutes
    • Automatically offers cancellation option
    • Resets detection counters when progress resumes

  • Smart Progress Monitoring

    • Enhanced timeout handling for slow connections
    • Better error handling for network issues
    • Improved responsiveness with faster polling

🛡️ Enhanced Error Handling

  • Cancellation vs Error Distinction

    • Separate handling for user cancellation vs system errors
    • Proper error messages and user feedback
    • Graceful cleanup on both cancellation and errors

  • Backend Cancellation Checks

    • Progress callbacks check for cancellation flags
    • Transfer loops include cancellation validation
    • Immediate termination when cancellation detected

🐛 Fixed

🚨 Critical Issues Resolved

  • Transfer Stuck at Specific Percentages

    • Problem: Transfers would freeze at percentages like 10.3% indefinitely
    • Root Cause: No cancellation mechanism and continued progress polling
    • Solution: Comprehensive cancellation system with proper cleanup

  • Infinite Progress Polling Loop

    • Problem: JavaScript continued making progress requests after transfer failure
    • Root Cause: Missing cleanup in progress monitoring
    • Solution: Proper cleanup in stopProgressMonitoring() with state reset

  • Backend Process Cleanup

    • Problem: SCP transfer processes weren't terminated on cancellation
    • Root Cause: No cancellation checks in transfer operations
    • Solution: Added cancellation validation in progress callbacks and loops

🔧 Technical Fixes

  • Progress Callback Enhancement

    # Added cancellation checks in progress callbacks
if session_id in self.connections and \
   self.connections[session_id].get('transfer_cancelled', False):
    raise Exception("Transfer cancelled by user")

  • Frontend State Management

    // Proper cleanup of monitoring variables
this.lastProgressUpdate = 0;
this.lastProgressValue = 0;
this.stuckCheckCount = 0;

  • Transfer Loop Validation

    # Check for cancellation before processing each file
if session_id in self.connections and \
   self.connections[session_id].get('transfer_cancelled', False):
    logger.info(f"Transfer cancelled by user for session {session_id}")
    break

🔄 Changed

⚡ Performance Improvements

  • Progress Monitoring Frequency

    • Increased from 1-second to 200ms intervals
    • More responsive progress updates
    • Better handling of slow internet connections

  • Timeout Handling

    • Added 2-second timeout for progress requests
    • Graceful handling of network timeouts
    • Improved error recovery mechanisms

🎨 UI/UX Enhancements

  • Progress Modal Improvements

    • Cancel button always visible during transfers
    • Better visual feedback on cancellation
    • Enhanced error and success messages

  • User Feedback System

    • Clear distinction between cancellation and errors
    • Professional completion modals
    • Improved progress information display

🧪 Testing

✅ New Test Coverage

  • Cancel Transfer Test Script (test_cancel_transfer.py)

    • Validates cancel endpoint availability
    • Tests progress monitoring functionality
    • Provides manual testing guidelines

  • Manual Testing Scenarios

    • Large file transfer cancellation
    • Stuck transfer detection
    • Network timeout handling
    • Multiple file transfer cancellation

📚 Documentation

📖 Comprehensive Documentation Added

  • HTML Project Documentation (PROJECT_DOCUMENTATION.html)

    • Complete feature overview with visual design
    • Technical architecture details
    • Error fixes and solutions documentation
    • Usage guides and examples

  • Git Documentation (GIT_DOCUMENTATION.md)

    • Complete Git workflow and branching strategy
    • Commit message conventions
    • Repository maintenance guidelines
    • Collaboration and security best practices

  • Deployment Instructions (DEPLOYMENT_INSTRUCTIONS.md)

    • Quick setup guides for all platforms
    • New feature usage instructions
    • Troubleshooting guidelines

[1.5.0] - 2025-08-18

✨ Added

  • Professional inline edit dialog system
  • Glass morphism design with backdrop blur effects
  • Cross-platform file path handling
  • Input validation with OS-specific character checking

🐛 Fixed

  • JavaScript syntax errors (duplicate closing braces)
  • File array initialization issues
  • Keep-alive API errors with incorrect manager references
  • Input dialog value preservation during element replacement

🔄 Changed

  • Enhanced dialog system with better event listener management
  • Improved error handling patterns with graceful fallbacks
  • Better file array synchronization between API and local state

[1.4.0] - 2025-08-17

✨ Added

  • SSH key authentication support (RSA, DSS, ECDSA, Ed25519)
  • Session management with Flask sessions
  • Connection tracking and monitoring
  • Enhanced progress monitoring system

🔄 Changed

  • Improved file transfer progress tracking
  • Better connection state management
  • Enhanced security with encrypted credential storage

[1.3.0] - 2025-08-16

✨ Added

  • Real-time transfer progress monitoring
  • Large file support (up to 10GB+)
  • Batch file operations
  • Drag and drop functionality

🐛 Fixed

  • Memory leaks in event listener management
  • File transfer timeout issues
  • Progress calculation accuracy

[1.2.0] - 2025-08-15

✨ Added

  • Dual authentication system (password/SSH key)
  • Encrypted credential storage with Fernet
  • Cross-platform startup scripts
  • Windows compatibility improvements

🔄 Changed

  • Enhanced UI with Windows 7 Aero theme
  • Improved responsive design
  • Better error handling and user feedback

[1.1.0] - 2025-08-14

✨ Added

  • Smart session keep-alive system
  • Auto-reconnection capabilities
  • File management operations (create, rename, delete)
  • Directory navigation improvements

🐛 Fixed

  • Connection timeout issues
  • File listing errors on different OS
  • Path handling inconsistencies

[1.0.0] - 2025-08-13

🎉 Initial Release

✨ Core Features

  • Web-based SCP file transfer interface
  • Secure SSH/SCP protocol implementation
  • Dual-panel file browser (local/remote)
  • Real-time file transfer progress
  • Cross-platform compatibility (macOS, Linux, Windows)

🔧 Technical Implementation

  • Backend: Python Flask + Paramiko
  • Frontend: Vanilla JavaScript + Modern CSS
  • Security: SSH protocol + encrypted sessions
  • UI: Glass morphism design with responsive layout

🚀 Deployment

  • Automatic port selection (5000, 5001, 5002, 8000, 8080, 8888, 9000)
  • One-command setup with dependency installation
  • Cross-platform startup scripts

🔮 Upcoming Features (Roadmap)

[2.1.0] - Planned

  • Resume Transfers: Ability to resume interrupted transfers
  • Bandwidth Limiting: Control transfer speed and bandwidth usage
  • Transfer Queue: Queue multiple transfers for sequential execution
  • Transfer History: Log and review past transfer operations

[2.2.0] - Planned

  • Multi-Server Support: Connect to multiple servers simultaneously
  • Scheduled Transfers: Schedule transfers for specific times
  • Compression Options: Optional compression for faster transfers
  • Advanced Filtering: File type and size filtering options

[3.0.0] - Future

  • Plugin System: Extensible architecture for custom features
  • API Integration: RESTful API for external integrations
  • Mobile App: Native mobile applications
  • Cloud Storage: Integration with cloud storage providers

🐛 Known Issues

Current Limitations

  • Large File Memory Usage: Very large files (>10GB) may use significant memory
  • Network Interruption: Network interruptions require manual reconnection
  • Concurrent Transfers: Only one transfer operation at a time per session

Workarounds

  • Memory Management: Monitor system resources during large transfers
  • Network Stability: Ensure stable network connection for large transfers
  • Transfer Planning: Plan transfers during stable network periods

🤝 Contributing

How to Contribute

  1. Fork the Repository: Create your own fork of the project
  2. Create Feature Branch: git checkout -b feature/amazing-feature
  3. Make Changes: Implement your feature with proper testing
  4. Update Documentation: Update relevant documentation
  5. Submit Pull Request: Create a pull request with detailed description

Development Guidelines

  • Follow the established code style and conventions
  • Include comprehensive tests for new features
  • Update documentation for any user-facing changes
  • Use semantic commit messages as defined in Git documentation

📞 Support and Feedback

Getting Help

  • Documentation: Check the comprehensive HTML documentation
  • Issues: Report bugs and request features via GitHub Issues
  • Discussions: Join community discussions for questions and ideas

Contact Information

This changelog is maintained as part of the MacOS to Linux SCP project. All dates are in YYYY-MM-DD format.