/// <reference types="express" />
import { Request } from '@loopback/rest';
import { ValidationConfig } from '../types';
import { SecurityLogger } from '../utils/security-logger';
/**
 * Input validator that sanitizes and validates incoming request data
 */
export declare class InputValidator {
    private config?;
    private logger?;
    private readonly maxBodySizeBytes;
    private skipFields;
    constructor(config?: ValidationConfig | undefined, logger?: SecurityLogger | undefined, skipFields?: string[]);
    /**
     * Validate and sanitize input from request
     */
    validateAndSanitizeInput(req: Request): Promise<void>;
    /**
     * Validate body size
     */
    private validateBodySize;
    /**
     * Check if a field should be skipped from validation
     */
    private shouldSkipField;
    /**
     * Process object recursively for validation and sanitization
     */
    private processObject;
    /**
     * Process individual string value
     */
    private processStringValue;
    /**
     * Check if field should preserve forward slashes (like S3 keys, file paths)
     */
    private shouldPreserveSlashes;
    /**
     * Sanitize string input
     */
    private sanitizeString;
    /**
     * Validate field based on its type/name
     */
    private validateFieldType;
    /**
     * Check if field name indicates email
     */
    private isEmailField;
    /**
     * Check if field name indicates URL
     */
    private isUrlField;
    /**
     * Check if field name indicates phone number
     */
    isPhoneField(fieldName: string): boolean;
    /**
     * Validate email format
     */
    private isValidEmail;
    /**
     * Validate URL format
     */
    private isValidUrl;
    /**
     * Validate phone number format
     * Supports multiple international formats
     */
    isValidPhoneNumber(phone?: string): boolean;
    /**
     * Check for suspicious patterns
     */
    private checkForSuspiciousPatterns;
    /**
     * Validate parameter lengths
     */
    private validateParameterLengths;
    /**
     * Recursively check object lengths
     */
    private checkObjectLengthsRecursive;
    /**
     * Parse size string to bytes
     */
    private parseSize;
    /**
     * Format bytes for human readable display
     */
    private formatBytes;
    /**
     * Sanitize value for logging
     */
    private sanitizeLogValue;
    /**
     * Check if value contains CSV injection patterns
     */
    private containsCsvInjectionPattern;
    /**
     * Get the CSV injection pattern from the value
     */
    private getCsvInjectionPattern;
    /**
     * Check if field is whitelisted for CSV injection (typically phone fields)
     */
    private isWhitelistedCsvField;
    /**
     * Get validation statistics
     */
    getStats(): {
        maxBodySizeBytes: number;
        maxParameterLength: number;
        sanitizeInput: boolean;
        strictMode: boolean;
        validateEmails: boolean;
        validateUrls: boolean;
    };
    /**
     * Update configuration
     */
    updateConfig(config: Partial<ValidationConfig>): void;
}