Security Framework

interface CredentialManager {
  storeCredential(userId: string, credential: Credential): Promise<string>;
  retrieveCredential(userId: string, credentialId: string): Promise<Credential>;
  rotateCredential(credentialId: string): Promise<void>;
  revokeCredential(credentialId: string): Promise<void>;
}

interface Credential {
  id: string;
  type: CredentialType;
  encryptedValue: string;
  metadata: CredentialMetadata;
  permissions: Permission[];
  expirationDate?: Date;
}

enum CredentialType {
  PRIVATE_KEY = "private_key",
  API_TOKEN = "api_token",
  DATABASE_PASSWORD = "database_password",
  SERVICE_ACCOUNT = "service_account",
}

class BlockchainKeyManager {
  private hsmClient: HSMClient;

  async signTransaction(
    keyId: string,
    transaction: Transaction
  ): Promise<SignedTransaction> {
    // Validate transaction before signing
    await this.validateTransaction(transaction);

    // Sign within HSM - private key never exposed
    const signature = await this.hsmClient.sign(keyId, transaction.hash);

    // Log signing operation
    await this.auditLog.record({
      operation: "transaction_sign",
      keyId,
      transactionHash: transaction.hash,
      timestamp: Date.now(),
    });

    return { ...transaction, signature };
  }
}

class EnterpriseCredentialVault {
  async getAPICredential(
    userId: string,
    service: string
  ): Promise<APICredential> {
    // Check user permissions
    await this.verifyAccess(userId, service);

    // Retrieve from encrypted vault
    const encrypted = await this.vault.get(`${userId}:${service}`);

    // Decrypt only for authorized request
    const credential = await this.decrypt(encrypted, userId);

    // Return time-limited credential
    return this.createTemporaryCredential(credential);
  }
}

interface Permission {
  resource: string;
  actions: Action[];
  conditions?: Condition[];
}

interface Role {
  name: string;
  description: string;
  permissions: Permission[];
  inherits?: string[];
}

interface UserRole {
  userId: string;
  roleId: string;
  grantedBy: string;
  grantedAt: Date;
  expiresAt?: Date;
}

// Example role definitions
const ROLES = {
  ADMIN: {
    name: "Platform Administrator",
    permissions: [{ resource: "*", actions: ["*"] }],
  },
  WORKFLOW_MANAGER: {
    name: "Workflow Manager",
    permissions: [
      {
        resource: "workflows",
        actions: ["create", "read", "update", "delete"],
      },
      { resource: "executions", actions: ["read", "trigger"] },
    ],
  },
  VIEWER: {
    name: "Read-Only User",
    permissions: [
      { resource: "workflows", actions: ["read"] },
      { resource: "executions", actions: ["read"] },
    ],
  },
};

class PermissionEngine {
  async hasPermission(
    userId: string,
    resource: string,
    action: string,
    context?: SecurityContext
  ): Promise<boolean> {
    const userRoles = await this.getUserRoles(userId);
    const permissions = await this.aggregatePermissions(userRoles);

    return this.evaluatePermission(permissions, resource, action, context);
  }

  private evaluatePermission(
    permissions: Permission[],
    resource: string,
    action: string,
    context?: SecurityContext
  ): boolean {
    for (const permission of permissions) {
      if (
        this.matchesResource(permission.resource, resource) &&
        this.matchesAction(permission.actions, action) &&
        this.matchesConditions(permission.conditions, context)
      ) {
        return true;
      }
    }
    return false;
  }
}

interface SecurityRule {
  id: string;
  type: "allow" | "deny";
  protocol: "tcp" | "udp" | "icmp";
  sourceIp?: string;
  destinationPort?: number;
  description: string;
}

interface SecurityEvent {
  timestamp: Date;
  sourceIp: string;
  eventType: SecurityEventType;
  severity: "low" | "medium" | "high" | "critical";
  details: any;
}

class IntrusionDetectionSystem {
  async analyzeTraffic(packet: NetworkPacket): Promise<SecurityEvent[]> {
    const events: SecurityEvent[] = [];

    // Check against known attack patterns
    if (await this.detectSQLInjection(packet)) {
      events.push(this.createSecurityEvent("sql_injection", "high", packet));
    }

    // Analyze traffic patterns
    if (await this.detectDDoS(packet)) {
      events.push(this.createSecurityEvent("ddos_attempt", "critical", packet));
    }

    return events;
  }
}

interface DLPPolicy {
  name: string;
  rules: DLPRule[];
  actions: DLPAction[];
}

interface DLPRule {
  pattern: string | RegExp;
  dataType: "credit_card" | "ssn" | "private_key" | "api_key";
  sensitivity: "low" | "medium" | "high";
}

class DataLossPreventionEngine {
  async scanContent(content: string): Promise<DLPViolation[]> {
    const violations: DLPViolation[] = [];

    for (const policy of this.policies) {
      const matches = await this.applyPolicy(policy, content);
      violations.push(...matches);
    }

    return violations;
  }

  private async applyPolicy(
    policy: DLPPolicy,
    content: string
  ): Promise<DLPViolation[]> {
    // Implementation of policy matching logic
    return this.detectSensitiveData(policy.rules, content);
  }
}

interface AuditEvent {
  eventId: string;
  timestamp: Date;
  userId?: string;
  sessionId?: string;
  eventType: AuditEventType;
  resource: string;
  action: string;
  success: boolean;
  ipAddress: string;
  userAgent?: string;
  metadata: any;
}

enum AuditEventType {
  AUTHENTICATION = "authentication",
  AUTHORIZATION = "authorization",
  DATA_ACCESS = "data_access",
  WORKFLOW_EXECUTION = "workflow_execution",
  CREDENTIAL_ACCESS = "credential_access",
  CONFIGURATION_CHANGE = "configuration_change",
}

class AuditLogger {
  async logEvent(event: AuditEvent): Promise<void> {
    // Encrypt sensitive audit data
    const encryptedEvent = await this.encryptAuditData(event);

    // Store in tamper-evident log
    await this.tamperProofStorage.store(encryptedEvent);

    // Send to SIEM if critical event
    if (this.isCriticalEvent(event)) {
      await this.siemIntegration.send(event);
    }
  }
}

interface ContractSecurityCheck {
  contractAddress: string;
  abi: any[];
  securityScore: number;
  risks: SecurityRisk[];
  recommendations: string[];
}

interface SecurityRisk {
  type: "reentrancy" | "overflow" | "access_control" | "oracle_manipulation";
  severity: "low" | "medium" | "high" | "critical";
  description: string;
  mitigation?: string;
}

class SmartContractValidator {
  async validateContract(address: string): Promise<ContractSecurityCheck> {
    const bytecode = await this.getBytecode(address);
    const risks = await this.analyzeRisks(bytecode);
    const auditStatus = await this.checkAuditStatus(address);

    return {
      contractAddress: address,
      abi: await this.getABI(address),
      securityScore: this.calculateSecurityScore(risks, auditStatus),
      risks,
      recommendations: this.generateRecommendations(risks),
    };
  }
}

interface IncidentResponse {
  trigger: SecurityEvent;
  actions: ResponseAction[];
  escalation: EscalationRule[];
}

interface ResponseAction {
  type: "block_ip" | "revoke_credentials" | "quarantine_user" | "alert_admin";
  parameters: any;
  automatic: boolean;
}

class IncidentResponseSystem {
  async handleIncident(event: SecurityEvent): Promise<void> {
    const response = this.getResponsePlan(event.eventType);

    for (const action of response.actions) {
      if (action.automatic) {
        await this.executeAction(action);
      } else {
        await this.requestManualIntervention(action);
      }
    }

    // Escalate if necessary
    if (this.shouldEscalate(event, response)) {
      await this.escalateIncident(event);
    }
  }
}