# Technical Specification
## Overview
Bookmark Exporter is a cross-platform Rust CLI tool that extracts browser data (bookmarks, history, passwords) from multiple web browsers and exports them to structured YAML format.
## Requirements
### Functional Requirements
1. **Browser Support**
- Chrome/Chromium-based browsers
- Firefox/Mozilla-based browsers
- Safari (macOS only)
- Edge (Chromium-based)
- Future: Brave, Vivaldi, Opera
2. **Data Types**
- Bookmarks (title, URL, folder structure, timestamps)
- History (URL, title, visit count, timestamps)
- Passwords (URL, username, encrypted password)
3. **Export Formats**
- YAML (primary)
- JSON (future)
- CSV (future)
4. **Operating Systems**
- macOS (10.15+)
- Windows (10+)
- Linux (major distributions)
### Non-Functional Requirements
1. **Performance**
- Export complete browser data within 30 seconds
- Handle databases up to 1GB
- Memory usage under 512MB
2. **Security**
- No plaintext passwords in logs
- Secure handling of encrypted data
- Respect OS security boundaries
3. **Reliability**
- Graceful handling of locked databases
- Recovery from corrupted data
- Comprehensive error reporting
## Architecture
### Core Components
1. **CLI Interface** (`main.rs`)
- Command parsing using clap
- Argument validation
- Output formatting
2. **Browser Detection** (`browser.rs`)
- Cross-platform browser discovery
- Profile enumeration
- Data path resolution
3. **Data Extraction** (`exporter.rs`)
- Browser-specific parsers
- Database access layer
- Format conversion
4. **Output Generation**
- YAML serialization
- File I/O operations
- Error handling
### Data Flow
```
CLI Arguments → Browser Detection → Data Extraction → Format Conversion → File Output
```
### Browser Data Storage
#### Chrome/Chromium
- Bookmarks: `Profile/Bookmarks` (JSON)
- History: `Profile/History` (SQLite)
- Passwords: `Profile/Login Data` (SQLite, encrypted)
#### Firefox
- Bookmarks/History: `Profile/places.sqlite` (SQLite)
- Passwords: `Profile/logins.json` (encrypted)
- Encryption: `Profile/key4.db` (SQLite)
#### Safari
- Bookmarks: `~/Library/Safari/Bookmarks.plist` (Property List)
- History: `~/Library/Safari/History.db` (SQLite)
- Passwords: System Keychain
### Security Considerations
1. **Data Access**
- Safari: Protected by macOS permissions
- Firefox: Database locking mechanism
- Chrome/Edge: OS-level encryption
2. **Password Handling**
- Use platform-specific keychain APIs
- No plaintext storage in temporary files
- Secure memory management
3. **File Permissions**
- Read-only access to browser data
- No modification of original files
- Temporary file cleanup
## Implementation Details
### Error Handling Strategy
1. **Graceful Degradation**
- Continue export when one browser fails
- Provide clear error messages
- Offer alternative solutions
2. **Error Types**
- Permission denied
- Database locked
- File not found
- Corrupted data
- Platform limitations
### Cross-Platform Support
1. **Path Resolution**
- Use `dirs` crate for standard directories
- Platform-specific default locations
- Custom path support
2. **Database Access**
- SQLite with appropriate flags
- File copying for locked databases
- Connection pooling for performance
3. **Security Integration**
- macOS: Keychain Services
- Windows: Credential Manager
- Linux: Secret Service API
### Performance Optimization
1. **Memory Management**
- Streaming for large datasets
- Lazy loading of data structures
- Efficient string handling
2. **I/O Optimization**
- Batch database operations
- Async file operations (future)
- Compression for large exports
## Testing Strategy
### Unit Tests
- Browser detection logic
- Data parsing functions
- Error handling paths
### Integration Tests
- End-to-end export workflows
- Multi-browser scenarios
- Platform-specific behavior
### Performance Tests
- Large database handling
- Memory usage profiling
- Export time benchmarks
## Extensibility
### New Browser Support
1. Add browser enum variant
2. Implement data path detection
3. Create extraction functions
4. Add platform-specific handling
### New Export Formats
1. Define data structure
2. Implement serialization
3. Add CLI option
4. Update documentation
### New Data Types
1. Define data model
2. Implement extraction logic
3. Add to export pipeline
4. Update tests
## Dependencies
### Core Dependencies
- `clap`: CLI argument parsing
- `serde`: Serialization framework
- `serde_yaml`: YAML output
- `rusqlite`: SQLite database access
- `dirs`: Cross-platform directories
- `anyhow`: Error handling
- `chrono`: Date/time handling
### Browser-Specific
- `plist`: Safari property list parsing
- `libsqlite3-sys`: SQLite bindings
### Platform-Specific
- macOS: Security framework
- Windows: Win32 API
- Linux: D-Bus interfaces
## Release Planning
### v0.1.0 (Current)
- Basic bookmark/history export
- Chrome, Firefox, Safari support
- YAML output format
- Cross-platform compatibility
### v0.2.0
- Password export implementation
- Additional browser support
- Performance improvements
- Enhanced error handling
### v1.0.0
- Full feature set
- Comprehensive testing
- Production stability
- Complete documentation