DollhouseMCP

# PR #319 Complete Reference - Element Interface Implementation **Date**: July 20, 2025 **PR**: #319 - Element interface implementation with Persona refactoring and Skills **Status**: ✅ MERGED ## What We Accomplished ### 1. Implemented Element Interface System - Created abstract `BaseElement` class with security features - Defined `IElement` interface for all element types - Implemented `PersonaElement` extending BaseElement - Created `Skill` element type with parameter system - Built `PersonaElementManager` for CRUD operations - Added 15 comprehensive tests for PersonaElement ### 2. Fixed ALL Security Issues Every security issue from the review was addressed with inline documentation: #### HIGH Severity (1 issue) ✅ - **YAML Injection**: Replaced `yaml.load()` with `SecureYamlParser.parse()` #### CRITICAL (3 issues) ✅ - **Race Conditions**: All file ops use `FileLockManager.atomicReadFile/WriteFile` - **Dynamic Requires**: Replaced with static `import * as yaml from 'js-yaml'` - **Input Validation**: All inputs go through `UnicodeValidator` + `sanitizeInput` #### MEDIUM (2 issues) ✅ - **Memory Management**: Parameter limits (100 max, 10KB each) + cleanup - **Audit Logging**: `SecurityMonitor.logSecurityEvent()` throughout ### 3. Documentation Success Every fix has inline comments explaining: - What the vulnerability was - How we fixed it - Why the fix improves security - Before/after code examples ### 4. Follow-up Issues Created Created 10 issues (#320-#329) for future improvements: - 4 Medium priority (error handling, validation, tests, Unicode) - 6 Low priority (types, docs, refactoring, performance) ## Key Files Created/Modified ### New Files - `src/persona/PersonaElement.ts` - IElement implementation for personas - `src/persona/PersonaElementManager.ts` - Manager with security fixes - `src/elements/skills/Skill.ts` - Complete skill element implementation - `test/__tests__/unit/persona/PersonaElement.test.ts` - 15 tests ### Modified Files - `src/collection/PersonaInstaller.ts` - Uses PortfolioManager - `src/index.ts` - Removed hardcoded personasDir ## Security Fix Locations ### PersonaElementManager.ts - Line 40-54: `load()` - Atomic file read - Line 74-94: `save()` - Atomic file write - Line 241-290: `importElement()` - SecureYamlParser - Line 298-324: `exportElement()` - Safe YAML dump - Line 332-342: `jsonToMarkdown()` - Safe YAML dump ### Skill.ts - Line 63-74: Constructor - Input sanitization - Line 124-139: `setParameter()` - Comprehensive validation - Line 144-167: String validation - XSS protection - Line 174-192: Memory limits - Prevent exhaustion - Line 442-450: `deactivate()` - Auto cleanup - Line 455-458: `clearParameters()` - Memory management ## Git History ``` 695329b - fix: Complete security fixes for YAML parsing and comprehensive documentation cacc71b - fix: Add SecureYamlParser to PersonaElementManager and comprehensive security comments f005278 - fix: Address critical and medium priority issues from PR review adcd11f - feat: Implement element interface with Persona refactoring and Skills ``` ## Next Steps 1. Implement Template element type (similar pattern to Skill) 2. Then Agents, Memories, Ensembles 3. Address follow-up issues by priority