feat: Content Update/tests:

[anonfedora]

feat: Content Update System with Version Control and History Tracking

🎯 Overview

Closes #17

This PR introduces a comprehensive content update system that allows authorized users to modify existing content while maintaining complete version history and audit trails. The implementation provides granular update capabilities with robust permission controls and detailed change tracking.

✨ Features Added

Core Update Functionality

• Complete Content Updates: Update title, description, content type, and category in a single operation
• Granular Field Updates: Dedicated functions for updating individual fields:
  • update_content_title() - Updates only the content title
  • update_content_description() - Updates only the description
  • update_content_type() - Updates only the content type
  • update_content_category() - Updates only the category

Version Control System

• Automatic Versioning: Each content update increments the version number
• Version Tracking: Track current version and total update count per content
• Last Updated Timestamps: Automatic timestamp recording for all updates

Update History & Audit Trail

• Complete History Tracking: Stores before/after values for all content fields
• Update Type Classification: Categorizes updates as Full, Partial, or field-specific
• Comprehensive Audit Log: Records updater, timestamp, version, and change details
• History Retrieval: Query update history by content ID and version

Permission & Authorization System

• Multi-layer Authorization: Content creators, admins, and delegated users can update content
• Delegation Support: Leverages existing delegation system for content updates
• Permission Verification: Robust can_update_content() function validates user permissions

🏗️ Technical Implementation

New Data Structures

struct ContentUpdateHistory {
    content_id: felt252,
    version: u64,
    updater: ContractAddress,
    timestamp: u64,
    update_type: ContentUpdateType,
    // Previous and new values for all fields
}

enum ContentUpdateType {
    Full, Partial, Title, Description, ContentType, Category
}

Enhanced Content Metadata

• Added last_updated: u64 timestamp field
• Added version: u64 version tracking field

Storage Enhancements

• content_update_history: Maps (content_id, version) → update history
• content_version_count: Maps content_id → current version
• content_update_count: Maps content_id → total updates

Event System

• ContentUpdated: Emitted on successful content updates
• ContentUpdateHistoryRecorded: Emitted when history is recorded

🔧 API Reference

Update Functions

• update_content(content_id, title, description, content_type, category) -> bool
• update_content_title(content_id, title) -> bool
• update_content_description(content_id, description) -> bool
• update_content_type(content_id, content_type) -> bool
• update_content_category(content_id, category) -> bool

Query Functions

• get_content_update_history(content_id, version) -> ContentUpdateHistory
• get_content_version(content_id) -> u64
• get_content_update_count(content_id) -> u64
• can_update_content(content_id, user) -> bool

🔒 Security & Authorization

Permission Hierarchy

1. Content Creator: Original content creator has full update rights
2. Platform Admin: System admin can update any content
3. Delegated Users: Users with DELEGATE_CONTENT permissions
4. Permission-based: Users with content-specific WRITE permissions

Validation & Safety

• Content existence verification before updates
• Empty field validation for critical updates
• Comprehensive authorization checks
• Safe state transitions with rollback capability

🧪 Testing

• Added comprehensive test suite in tests/test_content_update.cairo (370 lines)
• Updated existing test infrastructure
• Fixed delegation flag imports in test files

📁 Files Modified

Core Implementation

• src/chainlib/ChainLib.cairo (+347 lines, -12 lines)
  • Added content update system
  • Enhanced ContentMetadata structure
  • Implemented version control and history tracking
  • Added comprehensive permission system

Interface Updates

• src/interfaces/IChainLib.cairo (+38 lines, -1 line)
  • Added content update function signatures
  • Updated interface with new data structures

Testing Infrastructure

• tests/lib.cairo (+1 line)
  • Added content update test module
• tests/test_content_update.cairo (+370 lines)
  • Comprehensive test coverage for all update scenarios
• tests/test_account_delegation.cairo (-1 line)
  • Cleaned up delegation flag imports

Configuration

• .tool-versions (+1 line)
  • Updated Starknet Foundry version

🎉 Benefits

• Enhanced Content Management: Creators can keep content fresh and accurate
• Complete Audit Trail: Full transparency of all content changes
• Granular Control: Update specific fields without affecting others
• Version History: Track content evolution over time
• Robust Security: Multi-layered authorization prevents unauthorized changes
• Event-driven Architecture: Real-time notifications of content updates

🔄 Migration Notes

• Existing content automatically gets version 1 and current timestamp
• No breaking changes to existing functionality
• Backward compatible with current content structure

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Impact: This feature significantly enhances the platform's content management capabilities while maintaining security and providing complete transparency through comprehensive audit trails.

[Iwueseiter]

Nice one @anonfedora.