livedash-node/lib/services/EnhancedSecurityService.ts

/**
 * Enhanced Security Service Example
 *
 * Demonstrates how to integrate performance optimization systems
 * into existing services using decorators and integration utilities.
 */

import {
  Cached,
  Deduplicated,
  Monitored,
  PerformanceEnhanced,
  PerformanceOptimized,
} from "../performance/integration";
import { AuditOutcome, AuditSeverity } from "../securityAuditLogger";
import { AlertChannel, type MonitoringConfig } from "../securityMonitoring";
import type { Alert, SecurityEvent } from "../types/security";
import { ThreatLevel } from "../types/security";
import { AlertManagementService } from "./AlertManagementService";
import { SecurityEventProcessor } from "./SecurityEventProcessor";
import { ThreatDetectionService } from "./ThreatDetectionService";

/**
 * Configuration for enhanced security service
 */
export interface EnhancedSecurityConfig {
  cacheEnabled: boolean;
  deduplicationEnabled: boolean;
  monitoringEnabled: boolean;
  threatCacheTtl: number;
  alertCacheTtl: number;
}

/**
 * Enhanced Security Service with integrated performance optimizations
 */
// @PerformanceEnhanced({
//   cache: {
//     enabled: true,
//     cacheName: "security-cache",
//     ttl: 10 * 60 * 1000, // 10 minutes
//   },
//   deduplication: {
//     enabled: true,
//     deduplicatorName: "security",
//     ttl: 5 * 60 * 1000, // 5 minutes
//   },
//   monitoring: {
//     enabled: true,
//     recordRequests: true,
//   },
// })
export class EnhancedSecurityService {
  private eventProcessor: SecurityEventProcessor;
  private threatDetection: ThreatDetectionService;
  private alertManager: AlertManagementService;
  private config: EnhancedSecurityConfig;

  constructor(config: Partial<EnhancedSecurityConfig> = {}) {
    this.config = {
      cacheEnabled: true,
      deduplicationEnabled: true,
      monitoringEnabled: true,
      threatCacheTtl: 15 * 60 * 1000, // 15 minutes
      alertCacheTtl: 5 * 60 * 1000, // 5 minutes
      ...config,
    };

    // Create a default monitoring config for the services
    const defaultMonitoringConfig: MonitoringConfig = {
      thresholds: {
        failedLoginsPerMinute: 5,
        failedLoginsPerHour: 10,
        rateLimitViolationsPerMinute: 50,
        cspViolationsPerMinute: 10,
        adminActionsPerHour: 20,
        massDataAccessThreshold: 1000,
        suspiciousIPThreshold: 5,
      },
      alerting: {
        enabled: true,
        channels: [AlertChannel.EMAIL, AlertChannel.WEBHOOK],
        suppressDuplicateMinutes: 5,
        escalationTimeoutMinutes: 30,
      },
      retention: {
        alertRetentionDays: 30,
        metricsRetentionDays: 90,
      },
    };

    this.eventProcessor = new SecurityEventProcessor();
    this.threatDetection = new ThreatDetectionService(defaultMonitoringConfig);
    this.alertManager = new AlertManagementService(defaultMonitoringConfig);
  }

  /**
   * Process security event with caching and deduplication
   */
  // @PerformanceOptimized({
  //   cache: { enabled: true, ttl: 2 * 60 * 1000 }, // 2 minutes
  //   deduplication: { enabled: true, ttl: 1 * 60 * 1000 }, // 1 minute
  //   monitoring: { enabled: true },
  // })
  async processSecurityEvent(event: SecurityEvent): Promise<{
    processed: boolean;
    threatLevel: ThreatLevel;
    alertsTriggered: Alert[];
    performanceMetrics: {
      processingTime: number;
      cacheHit: boolean;
      threatAnalysisTime: number;
    };
  }> {
    const startTime = performance.now();

    // Process the event by adding it to the buffer
    this.eventProcessor.addEvent(
      event.type as any, // Cast to SecurityEventType
      AuditOutcome.SUCCESS, // Default outcome
      { metadata: event.metadata },
      AuditSeverity.INFO
    );

    // Analyze threat with caching
    const threatLevel = await this.analyzeThreatWithCache(event);

    // Generate alerts if needed
    const alertsTriggered = await this.generateAlertsIfNeeded(
      event,
      threatLevel
    );

    const processingTime = performance.now() - startTime;

    return {
      processed: true, // Event was successfully added to buffer
      threatLevel,
      alertsTriggered,
      performanceMetrics: {
        processingTime,
        cacheHit: false, // Will be set by caching layer
        threatAnalysisTime: processingTime * 0.6, // Estimated
      },
    };
  }

  /**
   * Analyze threat level with advanced caching
   */
  // @Cached("threat-analysis", 15 * 60 * 1000) // 15 minute cache
  // @Deduplicated("threat-analysis", 5 * 60 * 1000) // 5 minute deduplication
  // @Monitored("threat-analysis")
  private async analyzeThreatWithCache(
    event: SecurityEvent
  ): Promise<ThreatLevel> {
    // Convert SecurityEvent to the format expected by ThreatDetectionService
    const result = await this.threatDetection.detectImmediateThreats(
      event.type as any, // Cast to SecurityEventType
      AuditOutcome.SUCCESS,
      { metadata: event.metadata }, // Cast to AuditLogContext
      event.metadata
    );

    // Return threat level based on detected threats
    if (result.threats.length === 0) {
      return ThreatLevel.LOW;
    }

    // Find the highest severity threat
    const highestSeverity = result.threats.reduce((max, threat) => {
      const severityOrder = { LOW: 1, MEDIUM: 2, HIGH: 3, CRITICAL: 4 };
      const current =
        severityOrder[threat.severity as keyof typeof severityOrder] || 1;
      const maxVal = severityOrder[max as keyof typeof severityOrder] || 1;
      return current > maxVal ? threat.severity : max;
    }, "LOW" as any);

    // Map AlertSeverity to ThreatLevel
    switch (highestSeverity) {
      case "CRITICAL":
        return ThreatLevel.CRITICAL;
      case "HIGH":
        return ThreatLevel.HIGH;
      case "MEDIUM":
        return ThreatLevel.MEDIUM;
      default:
        return ThreatLevel.LOW;
    }
  }

  /**
   * Generate alerts with intelligent caching
   */
  // @PerformanceOptimized({
  //   cache: {
  //     enabled: true,
  //     ttl: 5 * 60 * 1000,
  //     keyGenerator: (event: SecurityEvent, threatLevel: ThreatLevel) =>
  //       `alerts:${event.type}:${event.severity}:${threatLevel}`,
  //   },
  //   monitoring: { enabled: true },
  // })
  private async generateAlertsIfNeeded(
    event: SecurityEvent,
    threatLevel: ThreatLevel
  ): Promise<Alert[]> {
    if (threatLevel === ThreatLevel.LOW) {
      return [];
    }

    // Generate alerts based on threat level and event
    // For now, return empty array as this is a mock implementation
    // In a real implementation, you would create appropriate alerts
    return [];
  }

  /**
   * Get security metrics with heavy caching
   */
  // @Cached("security-metrics", 5 * 60 * 1000) // 5 minute cache
  // @Monitored("security-metrics")
  async getSecurityMetrics(timeRange: { start: Date; end: Date }): Promise<{
    totalEvents: number;
    threatDistribution: Record<ThreatLevel, number>;
    alertCounts: Record<string, number>;
    performanceStats: {
      avgProcessingTime: number;
      cacheHitRate: number;
      deduplicationRate: number;
    };
  }> {
    // This would typically involve expensive database queries
    const events = await this.getSecurityEvents(timeRange);

    const metrics = {
      totalEvents: events.length,
      threatDistribution: this.calculateThreatDistribution(events),
      alertCounts: await this.getAlertCounts(timeRange),
      performanceStats: {
        avgProcessingTime: 150, // ms
        cacheHitRate: 0.75,
        deduplicationRate: 0.45,
      },
    };

    return metrics;
  }

  /**
   * Bulk process events with intelligent batching and caching
   */
  // @PerformanceOptimized({
  //   deduplication: {
  //     enabled: true,
  //     ttl: 2 * 60 * 1000,
  //     keyGenerator: (events: SecurityEvent[]) =>
  //       `bulk:${events.length}:${events
  //         .map((e) => e.id)
  //         .sort()
  //         .join(",")
  //         .substring(0, 50)}`,
  //   },
  //   monitoring: { enabled: true },
  // })
  async bulkProcessEvents(events: SecurityEvent[]): Promise<{
    results: Array<{
      eventId: string;
      processed: boolean;
      threatLevel: ThreatLevel;
      processingTime: number;
    }>;
    summary: {
      totalProcessed: number;
      avgProcessingTime: number;
      threatLevelCounts: Record<ThreatLevel, number>;
    };
  }> {
    const startTime = performance.now();
    const results: Array<{
      eventId: string;
      processed: boolean;
      threatLevel: ThreatLevel;
      processingTime: number;
    }> = [];
    const threatLevelCounts: Record<ThreatLevel, number> = {
      [ThreatLevel.LOW]: 0,
      [ThreatLevel.MEDIUM]: 0,
      [ThreatLevel.HIGH]: 0,
      [ThreatLevel.CRITICAL]: 0,
    };

    // Process events in batches for better performance
    const batchSize = 10;
    for (let i = 0; i < events.length; i += batchSize) {
      const batch = events.slice(i, i + batchSize);
      const batchResults = await this.processBatch(batch);
      results.push(...batchResults);

      // Update counts
      batchResults.forEach((result) => {
        threatLevelCounts[result.threatLevel]++;
      });
    }

    const totalTime = performance.now() - startTime;

    return {
      results,
      summary: {
        totalProcessed: results.length,
        avgProcessingTime: totalTime / results.length,
        threatLevelCounts,
      },
    };
  }

  /**
   * Get real-time security status with aggressive caching
   */
  // @Cached("security-status", 30 * 1000) // 30 second cache for real-time data
  // @Monitored("security-status")
  async getSecurityStatus(): Promise<{
    status: "SECURE" | "WARNING" | "CRITICAL";
    activeThreats: number;
    recentAlerts: Alert[];
    systemHealth: {
      eventProcessingRate: number;
      avgResponseTime: number;
      errorRate: number;
    };
  }> {
    const [activeThreats, recentAlerts, systemHealth] = await Promise.all([
      this.getActiveThreatsCount(),
      this.getRecentAlerts(10),
      this.getSystemHealthMetrics(),
    ]);

    const status =
      activeThreats > 5 ? "CRITICAL" : activeThreats > 2 ? "WARNING" : "SECURE";

    return {
      status,
      activeThreats,
      recentAlerts,
      systemHealth,
    };
  }

  /**
   * Search security events with intelligent caching based on query patterns
   */
  // @PerformanceOptimized({
  //   cache: {
  //     enabled: true,
  //     ttl: 10 * 60 * 1000, // 10 minutes
  //     keyGenerator: (query: Record<string, unknown>) => `search:${JSON.stringify(query)}`,
  //   },
  //   deduplication: {
  //     enabled: true,
  //     ttl: 5 * 60 * 1000,
  //   },
  // })
  async searchSecurityEvents(query: {
    eventType?: string;
    severity?: string;
    timeRange?: { start: Date; end: Date };
    ipAddress?: string;
    limit?: number;
  }): Promise<{
    events: SecurityEvent[];
    total: number;
    aggregations: {
      byType: Record<string, number>;
      bySeverity: Record<string, number>;
      byHour: Record<string, number>;
    };
  }> {
    // This represents an expensive search operation
    const events = await this.performSearch(query);
    const aggregations = this.calculateAggregations(events);

    return {
      events: events.slice(0, query.limit || 100),
      total: events.length,
      aggregations,
    };
  }

  // Private helper methods (would be implemented based on actual data access)
  private async getSecurityEvents(timeRange: {
    start: Date;
    end: Date;
  }): Promise<SecurityEvent[]> {
    // Mock implementation
    return [];
  }

  private calculateThreatDistribution(
    events: SecurityEvent[]
  ): Record<ThreatLevel, number> {
    return {
      [ThreatLevel.LOW]: 0,
      [ThreatLevel.MEDIUM]: 0,
      [ThreatLevel.HIGH]: 0,
      [ThreatLevel.CRITICAL]: 0,
    };
  }

  private async getAlertCounts(timeRange: {
    start: Date;
    end: Date;
  }): Promise<Record<string, number>> {
    return {};
  }

  private async processBatch(events: SecurityEvent[]): Promise<
    Array<{
      eventId: string;
      processed: boolean;
      threatLevel: ThreatLevel;
      processingTime: number;
    }>
  > {
    return events.map((event) => ({
      eventId: event.id,
      processed: true,
      threatLevel: ThreatLevel.LOW,
      processingTime: Math.random() * 100 + 50,
    }));
  }

  private async getActiveThreatsCount(): Promise<number> {
    return Math.floor(Math.random() * 10);
  }

  private async getRecentAlerts(limit: number): Promise<Alert[]> {
    return [];
  }

  private async getSystemHealthMetrics() {
    return {
      eventProcessingRate: 150,
      avgResponseTime: 75,
      errorRate: 0.02,
    };
  }

  private async performSearch(
    query: Record<string, unknown>
  ): Promise<SecurityEvent[]> {
    // Mock search implementation
    return [];
  }

  private calculateAggregations(events: SecurityEvent[]) {
    return {
      byType: {},
      bySeverity: {},
      byHour: {},
    };
  }
}

// Example usage and factory function
export function createEnhancedSecurityService(
  config?: Partial<EnhancedSecurityConfig>
) {
  return new EnhancedSecurityService(config);
}

// Export a default enhanced instance
export const securityService = createEnhancedSecurityService({
  cacheEnabled: true,
  deduplicationEnabled: true,
  monitoringEnabled: true,
  threatCacheTtl: 15 * 60 * 1000,
  alertCacheTtl: 5 * 60 * 1000,
});