AaveEscrow.sol

AaveEscrow.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

// buyer - puts the funds in the account
// arbiter - ability to move the funds
// recipient - receiver of the funds

// ERC20s common standard for tokens
interface IWethGateway {
    // going to send our ether into the AAVE protocol
    function depositETH(address lendingPool, address onBehalfOf, uint16 referralCode) external payable;
    function withdrawETH(address lendingPool, uint256 amount, address to) external;
}

interface ILendingPool {
    function getUserAccountData(address user) external view returns (
      uint256 totalCollateralETH,
      uint256 totalDebtETH,
      uint256 availableBorrowsETH,
      uint256 currentLiquidationThreshold,
      uint256 ltv,
      uint256 healthFactor
    );
}

interface IERC20 {
    function approve(address,uint256) external returns(bool); 
}

contract Escrow { 
    address buyer;
    address arbiter;
    address recipient;

    // remember: constants are NOT storage variables 
    IWethGateway constant gateway = IWethGateway(0xEFFC18fC3b7eb8E676dac549E0c693ad50D1Ce31);
    address constant lendingPool = 0x7d2768dE32b0b80b7a3454c06BdAc94A69DDc7A9;
    IERC20 constant aWETH = IERC20(0x030bA81f1c18d280636F32af80b9AAd02Cf0854e);

    constructor(address _arbiter, address _recipient) {
        buyer = msg.sender;
        arbiter = _arbiter;
        recipient = _recipient;
    }

    receive() external payable {
        // deposit these funds into AAVE (5 ether)
        gateway.depositETH{ value: msg.value }(lendingPool, address(this), 0);
    }

    // when the transaction is complete
    function moveFunds() external {
        require(arbiter == msg.sender);
        // thank you Georgi!!! :wooohoooo:
        aWETH.approve(gateway, type(uint).max);
        gateway.withdrawETH(lendingPool, type(uint).max, recipient);
    }

}