/**
 * Input validation and sanitization for Slack events and content
 * Prevents injection attacks and validates event structure
 */
import type { SlackMentionEvent } from '../multi-agent/slack-multi-bot-manager.js';
export interface SlackEventValidationError extends Error {
    name: 'SlackEventValidationError';
    field?: string;
    value?: unknown;
}
export interface ValidationOptions {
    /** Maximum message content length (default: 4000) */
    maxContentLength?: number;
    /** Whether to allow bot messages (default: true) */
    allowBotMessages?: boolean;
    /** Custom forbidden patterns */
    forbiddenPatterns?: RegExp[];
    /** Whether to strip HTML/markdown (default: true) */
    stripMarkdown?: boolean;
    /** Whitelist of allowed characters/patterns (default: null for no whitelist) */
    allowedCharacters?: RegExp;
    /** Whether to use strict whitelist validation (default: false) */
    useWhitelistValidation?: boolean;
}
/**
 * Validates Slack channel ID format (C followed by alphanumeric)
 */
export declare function validateChannelId(channelId: string): boolean;
/**
 * Validates Slack user ID format (U followed by alphanumeric)
 */
export declare function validateUserId(userId: string): boolean;
/**
 * Validates Slack bot ID format (B followed by alphanumeric)
 */
export declare function validateBotId(botId: string): boolean;
/**
 * Validates Slack timestamp format (Unix timestamp with microseconds)
 */
export declare function validateTimestamp(ts: string): boolean;
/**
 * Sanitizes message content by removing potentially dangerous patterns
 */
export declare function sanitizeMessageContent(content: string, options?: ValidationOptions): string;
/**
 * Validates a Slack mention event structure and sanitizes content
 */
export declare function validateMentionEvent(event: unknown, options?: ValidationOptions): SlackMentionEvent;
/**
 * Creates a validation error with consistent structure
 */
export declare function createValidationError(message: string, field?: string, value?: unknown): SlackEventValidationError;
/**
 * Checks if an error is a Slack event validation error
 */
export declare function isValidationError(error: unknown): error is SlackEventValidationError;
/**
 * Safe wrapper for validation that returns result or null on error
 */
export declare function safeValidateMentionEvent(event: unknown, options?: ValidationOptions): SlackMentionEvent | null;
/**
 * Validation presets for different security levels
 */
export declare const ValidationPresets: {
    /** Strict validation with maximum security */
    STRICT: ValidationOptions;
    /** Standard validation for normal use */
    STANDARD: ValidationOptions;
    /** Permissive validation with basic checks only */
    PERMISSIVE: ValidationOptions;
    /** Whitelist-only validation for ultra-secure environments */
    WHITELIST_ONLY: ValidationOptions;
};
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