[Plugin] Create Safe HTML Sanitizer Plugin using Plugin Framework

[crivetimihai]

Overview

Create a Safe HTML Sanitizer Plugin that sanitizes HTML content to prevent XSS attacks and other security vulnerabilities in tool outputs and resource content.

Plugin Requirements

Plugin Details

• Name: SafeHtmlSanitizerPlugin
• Type: Self-contained (native) plugin
• File Location: plugins/safe_html_sanitizer/
• Complexity: Medium

Functionality

• Sanitize HTML content to prevent XSS attacks
• Remove dangerous tags and attributes
• Clean malicious JavaScript and event handlers
• Preserve safe formatting and structure
• Support configurable sanitization levels

Hook Integration

• Primary Hooks: tool_post_invoke, resource_post_fetch
• Purpose: Sanitize HTML content in outputs
• Behavior: Clean dangerous HTML elements while preserving safe content

Acceptance Criteria

• Plugin implements SafeHtmlSanitizerPlugin class
• HTML sanitization with XSS prevention
• Configurable tag and attribute allowlists
• JavaScript and event handler removal
• CSS sanitization support
• Plugin manifest and documentation created
• Unit tests with >90% coverage

Priority

High - Security feature

Dependencies

• HTML parsing libraries
• Security sanitization utilities

Security Considerations

• Comprehensive XSS prevention
• Safe defaults for unknown content
• Audit logging for sanitization actions