/// <reference types="express" />
import { Response } from '@loopback/rest';
import { SecurityHeadersConfig } from '../types';
import { SecurityLogger } from '../utils/security-logger';
/**
 * Security headers handler that applies security-related HTTP headers
 */
export declare class SecurityHeadersHandler {
    private config?;
    private logger?;
    constructor(config?: SecurityHeadersConfig | undefined, logger?: SecurityLogger | undefined);
    /**
     * Apply security headers to response
     */
    applyHeaders(res: Response): Promise<void>;
    /**
     * Set Content Security Policy header
     */
    private setContentSecurityPolicy;
    /**
     * Set HTTP Strict Transport Security header
     */
    private setHsts;
    /**
     * Set additional security headers
     */
    private setAdditionalSecurityHeaders;
    /**
     * Get list of enabled headers
     */
    private getEnabledHeaders;
    /**
     * Get headers that were applied to response
     */
    private getAppliedHeaders;
    /**
     * Update CSP policy
     */
    updateContentSecurityPolicy(policy: string): void;
    /**
     * Update HSTS configuration
     */
    updateHsts(maxAge: number, includeSubDomains?: boolean, preload?: boolean): void;
    /**
     * Enable or disable specific header
     */
    toggleHeader(headerName: keyof SecurityHeadersConfig, enabled: boolean): void;
    /**
     * Get current configuration
     */
    getConfig(): SecurityHeadersConfig | undefined;
    /**
     * Get security headers analysis
     */
    getHeadersAnalysis(): {
        totalHeaders: number;
        enabledHeaders: string[];
        disabledHeaders: string[];
        securityScore: number;
    };
    /**
     * Update configuration
     */
    updateConfig(config: Partial<SecurityHeadersConfig>): void;
}