openraas/dist/server/middleware.js

Open Robot-as-a-Service Protocol - A comprehensive TypeScript library for building and consuming RaaS applications with X402 payment support on Solana

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.PaymentMiddleware = void 0;
const x402_1 = require("../core/x402");
class PaymentMiddleware {
    constructor(receiverAddress, mint, pricePerRequest // BigInt string
    ) {
        this.receiverAddress = receiverAddress;
        this.mint = mint;
        this.pricePerRequest = pricePerRequest;
    }
    async handle(ctx) {
        const { req, send, next } = ctx;
        // Check for X-PAYMENT header or payload property
        const paymentPayload = req.headers?.['x-payment'] || req.payment;
        if (!paymentPayload) {
            // 402 Payment Required
            const request = x402_1.X402Payment.createRequest(this.receiverAddress, this.pricePerRequest, this.mint);
            send({
                status: 'payment_required',
                paymentRequest: request,
            });
            return;
        }
        try {
            const publicKey = x402_1.X402Payment.verifyPayment(paymentPayload);
            // In a real app, we would also:
            // 1. Check if the payment is on-chain (or valid off-chain channel)
            // 2. Check nonce replay
            // 3. Check amount >= pricePerRequest
            if (BigInt(paymentPayload.request.amount) < BigInt(this.pricePerRequest)) {
                throw new Error('Insufficient payment amount');
            }
            // Attach user info
            req.user = { publicKey };
            await next();
        }
        catch (err) {
            send({
                status: 'error',
                error: `Payment verification failed: ${err.message}`,
            });
        }
    }
}
exports.PaymentMiddleware = PaymentMiddleware;