/// <reference types="express" />
import { Request, Response } from '@loopback/rest';
import { CorsConfig } from '../types';
import { SecurityLogger } from '../utils/security-logger';
/**
 * CORS handler that manages Cross-Origin Resource Sharing policies
 */
export declare class CorsHandler {
    private config?;
    private logger?;
    constructor(config?: CorsConfig | undefined, logger?: SecurityLogger | undefined);
    /**
     * Handle CORS for the request
     */
    handleCors(req: Request, res: Response): Promise<void>;
    /**
     * Check if origin is allowed
     */
    private isOriginAllowed;
    /**
     * Match origin against allowed origin pattern
     */
    private matchOrigin;
    /**
     * Set CORS headers on response
     */
    private setCorsHeaders;
    /**
     * Handle preflight OPTIONS request
     */
    private handlePreflightRequest;
    /**
     * Get CORS configuration for debugging
     */
    getConfig(): CorsConfig | undefined;
    /**
     * Check if a specific origin is allowed (for testing)
     */
    checkOrigin(origin: string): boolean;
    /**
     * Add allowed origin
     */
    addAllowedOrigin(origin: string): void;
    /**
     * Remove allowed origin
     */
    removeAllowedOrigin(origin: string): void;
    /**
     * Add allowed method
     */
    addAllowedMethod(method: string): void;
    /**
     * Add allowed header
     */
    addAllowedHeader(header: string): void;
    /**
     * Update CORS configuration
     */
    updateConfig(config: Partial<CorsConfig>): void;
    /**
     * Get CORS statistics
     */
    getStats(): {
        allowedOrigins: number;
        allowedMethods: number;
        allowedHeaders: number;
        credentialsEnabled: boolean;
        preflightMaxAge: number;
    };
}