Details

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Votes.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract GovernanceToken is ERC20Votes, Ownable {
    constructor() ERC20("Governance Token", "GOV") ERC20Permit("Governance Token") {
        _mint(msg.sender, 1000000 * 10**decimals());
    }

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

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

interface IFlashLoanReceiver {
    function executeOperation(
        address asset,
        uint256 amount,
        uint256 fee,
        bytes calldata params
    ) external returns (bool);
}

contract FlashLoanProvider {
    IERC20 public token;
    uint256 public feePercentage = 9; // 0.09% fee

    event FlashLoan(address indexed borrower, uint256 amount, uint256 fee);

    constructor(address _token) {
        token = IERC20(_token);
    }

    function flashLoan(
        address receiver,
        uint256 amount,
        bytes calldata params
    ) external {
        uint256 balanceBefore = token.balanceOf(address(this));
        require(balanceBefore >= amount, "Insufficient liquidity");

        uint256 fee = (amount * feePercentage) / 10000;

        // Send tokens to receiver
        token.transfer(receiver, amount);

        // Execute callback
        require(
            IFlashLoanReceiver(receiver).executeOperation(
                address(token),
                amount,
                fee,
                params
            ),
            "Flash loan failed"
        );

        // Verify repayment
        uint256 balanceAfter = token.balanceOf(address(this));
        require(balanceAfter >= balanceBefore + fee, "Flash loan not repaid");

        emit FlashLoan(receiver, amount, fee);
    }
}

// Example flash loan receiver
contract FlashLoanReceiver is IFlashLoanReceiver {
    function executeOperation(
        address asset,
        uint256 amount,
        uint256 fee,
        bytes calldata params
    ) external override returns (bool) {
        // Decode params and execute arbitrage, liquidation, etc.
        // ...

        // Approve repayment
        IERC20(asset).approve(msg.sender, amount + fee);

        return true;
    }
}