#443 Video Conferencing: Fraud Detection

[Tim4evar]

Summary

Implements comprehensive Fraud Detection for Video Conferencing to address issue #443.

Changes

New Files

• *\src/services/fraud-detection/types.ts* - Type definitions for FraudDetectionService (FraudEvent, FraudDetectionResult, ConferenceAccessCheck, etc.)
• *\src/services/fraud-detection/index.ts* - Core FraudDetectionService with detection for:
  • Rapid join/leave patterns (connection anomaly)
  • Multiple concurrent connections per user
  • Screen share abuse (rapid toggling)
  • Meeting bombing (rapid joins from different users)
  • Action abuse (excessive call starts)
  • Suspicious identity detection (accumulated risk scoring)
  • Conference access control with role-based verification
• *\src/hooks/useFraudDetection.ts* - React hook wrapping the service for component integration
• *\src/services/fraud-detection/tests/FraudDetectionService.test.ts* - 27 unit tests covering all detection scenarios

Modified Files

• *\src/components/collaboration/VideoConference.tsx* - Integrated fraud detection:
  • Fraud score badge (color-coded: yellow/amber/red based on severity)
  • Fraud warning alerts (amber banner)
  • Access blocked state (start call button disabled)
  • Action checks on join, start call, screen share
  • Meeting bombing detection on call start
  • Fraud status display in controls panel
• *\src/components/leaderboard/LeaderboardConference.tsx* - Added:
  • Conference access control via fraud detection
  • Host tracking on conferences
  • Locked state for conferences
  • Access error alerts with dismiss
  • Host badge display
• *\src/hooks/useCollaboration.ts* - Added \isHost\ field to CollaborationUser type

Testing

• All 27 new fraud detection tests pass
• All 19 existing LeaderboardConference tests pass (no regression)
• Configurable thresholds via FraudDetectionConfig