ERC20 支付處理

Question

我的智能合約出了什么問題，因為我收到“錯誤：無法估算氣體；交易可能失敗或可能需要手動氣體限制”。 在前端，我先調用approveTokens()，然后再調用acceptPayment()

pragma solidity ^0.8.11;

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';

contract PaymentProcessor {
   address public owner;
   IERC20 public token;

constructor(address _owner, address _token) {
    owner = _owner;
    token = IERC20(_token);
}

event PaymentCompleted(
    address payer,
    uint256 amount,
    uint paymentId,
    uint timestamp
);

function approveTokens(uint256 amount) public returns(bool){
   token.approve(owner, amount);
   return true;
}

function getAllowance() public view returns(uint256){
    return token.allowance(msg.sender, owner);
}

function acceptPayment(uint256 amount, uint paymentId) payable public {
    require(amount > getAllowance(), "Please approve tokens before transferring");
    token.transfer(owner, amount);

    emit PaymentCompleted(msg.sender, amount, paymentId, block.timestamp);
}

}

Answer 1

用戶需要直接在代token地址上調用approve() ——而不是通過你的合約。

您當前的實現批准owner使用PaymentProcessor的代幣，因為PaymentProcessor是代token合約上下文中的msg.sender 。