import { Request, Response } from 'express';
import { TicketIssuer, ValidationResult } from '@agntor/sdk';
/**
 * Configuration for the trust proxy middleware
 */
export interface TrustProxyConfig {
    /** Ticket issuer instance for validation */
    issuer: TicketIssuer;
    /** Custom header name for the audit proof (default: 'x-agntor-proof') */
    headerName?: string;
    /** Whether to require audit proof for all requests (default: true) */
    requireProof?: boolean;
    /** Custom error handler */
    onError?: (error: TrustProxyError, req: Request, res: Response) => void;
    /** Custom success handler (for logging/metrics) */
    onSuccess?: (result: ValidationResult, req: Request) => void;
    /** Whether to extract transaction value from request (default: true) */
    validateTransactionValue?: boolean;
    /** Path to transaction value in request body (default: 'amount') */
    transactionValuePath?: string;
    /** Path to MCP server name in request body (default: 'mcp_server') */
    mcpServerPath?: string;
    /** Path to payment protocol in request body (default: 'payment_protocol') */
    paymentProtocolPath?: string;
    /** Path to x402 payment proof in request body (default: 'x402_proof') */
    x402PaymentProofPath?: string;
    /** Whether to guard incoming prompt/input for injection (default: false) */
    guardInputs?: boolean;
    /** Path to the input field to guard (default: 'prompt' or 'input') */
    inputPath?: string;
    /** Whether to redact PII/Secrets from outgoing responses (default: false) */
    redactOutputs?: boolean;
}
/**
 * Extended Express Request with Agntor audit data
 */
export interface AgntorRequest extends Request {
    agntor?: {
        /** Validated audit ticket payload */
        ticket: ValidationResult['payload'];
        /** Agent ID from the ticket */
        agentId: string;
        /** Audit level of the certified agent */
        auditLevel: string;
    };
}
/**
 * Trust Proxy error types
 */
export declare class TrustProxyError extends Error {
    statusCode: number;
    errorCode: string;
    details?: unknown | undefined;
    constructor(message: string, statusCode: number, errorCode: string, details?: unknown | undefined);
}
/**
 * Response format for 402 Payment Required with Agntor context
 */
export interface Payment402Response {
    error: string;
    code: 402;
    message: string;
    payment_context: {
        required_proof: 'X-AGNTOR-Proof';
        issuer_endpoint?: string;
        documentation?: string;
    };
}
/**
 * Response format for 403 Forbidden (failed validation)
 */
export interface Forbidden403Response {
    error: string;
    code: 403;
    message: string;
    reason: string;
    error_code: string;
}
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