现实世界事件预言机

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol";

/**
 * @title S402Facilitator
 * @notice HTTP 402 micropayment protocol with EIP-2612 permits
 * @dev Enables frictionless agent-tool interactions on BNB Chain
 * @custom:address 0x605c5c8d83152bd98ecAc9B77a845349DA3c48a3 (BNB Chain Mainnet)
 */
contract S402Facilitator is ReentrancyGuard {
    IERC20 public immutable USDC;
    address public immutable treasury;
    uint256 public constant PROTOCOL_FEE_BPS = 100; // 1%

    struct PaymentAuthorization {
        address payer;
        address payee;
        uint256 amount;
        uint256 nonce;
        uint256 deadline;
        bytes32 merkleRoot;      // For batch verification
    }

    mapping(address => uint256) public nonces;
    mapping(bytes32 => bool) public processedPayments;

    event PaymentAuthorized(
        bytes32 indexed authId,
        address indexed payer,
        address indexed payee,
        uint256 amount,
        uint256 protocolFee
    );

    event PaymentSettled(
        bytes32 indexed authId,
        bytes32 merkleRoot,
        uint256 timestamp
    );

    constructor(address _usdc, address _treasury) {
        require(_usdc != address(0) && _treasury != address(0), "Invalid addresses");
        USDC = IERC20(_usdc);
        treasury = _treasury;
    }

    function createPaymentAuthorization(
        PaymentAuthorization calldata auth,
        uint8 permitV,
        bytes32 permitR,
        bytes32 permitS
    ) external nonReentrant returns (bytes32 authId) {
        require(auth.deadline >= block.timestamp, "Expired");
        require(auth.nonce == nonces[auth.payer], "Invalid nonce");

        IERC20Permit(address(USDC)).permit(
            auth.payer,
            address(this),
            auth.amount,
            auth.deadline,
            permitV,
            permitR,
            permitS
        );

        authId = keccak256(abi.encode(auth));
        require(!processedPayments[authId], "Already processed");

        uint256 protocolFee = (auth.amount * PROTOCOL_FEE_BPS) / 10000;
        uint256 payeeAmount = auth.amount - protocolFee;

        require(USDC.transferFrom(auth.payer, auth.payee, payeeAmount), "Transfer failed");
        require(USDC.transferFrom(auth.payer, treasury, protocolFee), "Fee transfer failed");

        processedPayments[authId] = true;
        nonces[auth.payer]++;

        emit PaymentAuthorized(authId, auth.payer, auth.payee, auth.amount, protocolFee);
    }

    function settlePayment(
        bytes32 authId,
        bytes32 merkleRoot,
        bytes32[] calldata merkleProof
    ) external nonReentrant {
        require(processedPayments[authId], "Payment not authorized");

        bytes32 leaf = keccak256(abi.encodePacked(authId));
        require(
            MerkleProof.verify(merkleProof, merkleRoot, leaf),
            "Invalid proof"
        );

        emit PaymentSettled(authId, merkleRoot, block.timestamp);
    }

    function verifyPayment(bytes32 authId) external view returns (bool) {
        return processedPayments[authId];
    }
}

contract MultiWalletS402Pool {
    S402Facilitator public immutable facilitator;
    address[10] public workers;
    uint256 public currentWorker;

    constructor(address _facilitator, address[10] memory _workers) {
        facilitator = S402Facilitator(_facilitator);
        workers = _workers;
    }

    function getNextWorker() external returns (address) {
        address worker = workers[currentWorker];
        currentWorker = (currentWorker + 1) % 10;
        return worker;
    }
}