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Solidity

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/escrow/ConditionalEscrow.sol)
pragma solidity ^0.8.0;
import "./Escrow.sol";
/**
* @title ConditionalEscrow
* @dev Base abstract escrow to only allow withdrawal if a condition is met.
* @dev Intended usage: See {Escrow}. Same usage guidelines apply here.
*/
abstract contract ConditionalEscrow is Escrow {
/**
* @dev Returns whether an address is allowed to withdraw their funds. To be
* implemented by derived contracts.
* @param payee The destination address of the funds.
*/
function withdrawalAllowed(address payee) public view virtual returns (bool);
function withdraw(address payable payee) public virtual override {
require(withdrawalAllowed(payee), "ConditionalEscrow: payee is not allowed to withdraw");
super.withdraw(payee);
}
}