// Proper authorization middleware
const requireRole = (role: string) => {
  return (ctx: Context) => {
    const user = getCurrentUser(ctx);
    if (!user || !user.roles.includes(role)) {
      ctx.response.status = 403;
      ctx.response.body = { error: "Forbidden" };
      return;
    }
  };
};

// Usage
router.get("/admin/users", requireRole("admin"), getUsersHandler);

import { createHash } from "crypto";

// Secure password hashing
export async function hashPassword(password: string): Promise<string> {
  const salt = crypto.randomBytes(32);
  const hash = await crypto.pbkdf2(password, salt, 100000, 64, "sha256");
  return `${salt.toString("hex")}:${hash.toString("hex")}`;
}

// Secure token generation
export function generateSecureToken(): string {
  return crypto.randomBytes(32).toString("hex");
}

// Safe parameterized queries
const getUserById = async (userId: string) => {
  const query = "SELECT * FROM users WHERE id = ?";
  const [rows] = await db.execute(query, [userId]);
  return rows[0];
};

// Input validation
import { z } from "zod";

const userSchema = z.object({
  email: z.string().email(),
  name: z.string().min(2).max(100),
  age: z.number().min(0).max(150),
});

const validateUser = (data: unknown) => {
  return userSchema.parse(data);
};

// Defense in depth
class SecurityService {
  async authenticateUser(credentials: LoginCredentials) {
    // 1. Rate limiting
    await this.checkRateLimit(credentials.email);

    // 2. Input validation
    this.validateCredentials(credentials);

    // 3. Credential verification
    const user = await this.verifyCredentials(credentials);

    // 4. Session creation
    const session = await this.createSecureSession(user);

    return session;
  }
}

class ZeroTrustAuth {
  async authorizeRequest(request: Request): Promise<boolean> {
    // 1. Verify identity
    const identity = await this.verifyIdentity(request);

    // 2. Check context
    const context = await this.evaluateContext(request);

    // 3. Assess risk
    const risk = await this.assessRisk(identity, context);

    // 4. Make authorization decision
    return this.makeDecision(identity, context, risk);
  }
}

// JWT authentication middleware
const authenticateJWT = async (ctx: Context, next: Next) => {
  const token = ctx.request.headers.get("Authorization")?.replace(
    "Bearer ",
    "",
  );

  if (!token) {
    ctx.response.status = 401;
    ctx.response.body = { error: "No token provided" };
    return;
  }

  try {
    const payload = await verifyJWT(token);
    ctx.state.user = payload;
    await next();
  } catch (error) {
    ctx.response.status = 401;
    ctx.response.body = { error: "Invalid token" };
  }
};

import { rateLimit } from "express-rate-limit";

const limiter = rateLimit({
  windowMs: 15 * 60 * 1000, // 15 minutes
  max: 100, // limit each IP to 100 requests per windowMs
  message: "Too many requests from this IP, please try again later.",
  standardHeaders: true,
  legacyHeaders: false,
});

app.use("/api/", limiter);

class SecurityLogger {
  async logSecurityEvent(event: SecurityEvent) {
    const logEntry = {
      timestamp: new Date(),
      level: "security",
      event: event.type,
      userId: event.userId,
      ip: event.ip,
      userAgent: event.userAgent,
      details: event.details,
    };

    // Send to SIEM system
    await this.siemClient.send(logEntry);

    // Alert on critical events
    if (event.severity === "critical") {
      await this.alertTeam(event);
    }
  }
}

class IntrusionDetector {
  async analyzeRequest(request: Request): Promise<RiskLevel> {
    const riskFactors = await Promise.all([
      this.checkIPReputation(request.ip),
      this.checkUserBehavior(request.userId),
      this.checkRequestPatterns(request),
      this.checkAnomalyDetection(request),
    ]);

    return this.calculateRiskLevel(riskFactors);
  }
}

class GDPRCompliance {
  async handleDataSubjectRequest(request: DataSubjectRequest) {
    switch (request.type) {
      case "access":
        return await this.provideDataAccess(request.userId);
      case "rectification":
        return await this.rectifyData(request.userId, request.data);
      case "erasure":
        return await this.eraseData(request.userId);
      case "portability":
        return await this.exportData(request.userId);
    }
  }
}

class SecurityAuditor {
  async performSecurityAudit() {
    const results = {
      vulnerabilityScan: await this.runVulnerabilityScan(),
      configurationReview: await this.reviewConfiguration(),
      accessControlAudit: await this.auditAccessControls(),
      complianceCheck: await this.checkCompliance(),
    };

    await this.generateReport(results);
    await this.notifyStakeholders(results);
  }
}

class IncidentResponse {
  async handleSecurityIncident(incident: SecurityIncident) {
    // 1. Assess the situation
    const assessment = await this.assessIncident(incident);

    // 2. Contain the breach
    await this.containBreach(assessment);

    // 3. Investigate thoroughly
    const investigation = await this.investigateIncident(incident);

    // 4. Recover systems
    await this.recoverSystems(investigation);

    // 5. Learn and improve
    await this.postMortemAnalysis(incident, investigation);
  }
}