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// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.19;

import "ERC20.sol";
import "IXFETH.sol";
import "IBorrower.sol";

/**
 * @title The xfETH contract
 * @author Xfai
 * @notice The xfETH token is a flash mintable wrapped token that can accumulate fees over time through flash mintable arbitrage
 */
contract XFETH is ERC20, IXFETH {
  /**
   * @notice The owner of the xfETH contract
   */
  address public override owner;

  /**
   * @notice The initial arbitrageur of the xfETH contract.
   * @dev Only used while isPublic is false.
   */
  address private arbitrageur;

  /**
   * @notice The fee applied on flash mints
   */
  uint public override flashMintFee;

  /**
   * @notice Used to prevet reentrancy attacks
   */
  uint private constant _NOT_ENTERED = 1;

  /**
   * @notice Used to prevet reentrancy attacks
   */
  uint private constant _ENTERED = 2;

  /**
   * @notice Used to prevet reentrancy attacks
   */
  uint private _status;

  /**
   * @notice If true, anyone can perform flash minting
   */
  bool private _isPublic;

  modifier nonReentrant() {
    require(_status != _ENTERED, 'xfETH: reentrant call');
    _status = _ENTERED;
    _;
    _status = _NOT_ENTERED;
  }

  modifier nonReentrantRead() {
    require(_status != _ENTERED, 'xfETH: reentrant call');
    _;
  }

  modifier onlyOwner() {
    require(msg.sender == owner, 'xfETH: NOT_OWNER');
    _;
  }

  modifier isPublic() {
    if (_isPublic == false) {
      require(msg.sender == arbitrageur, 'xfETH: NOT_ARBITRAGEUR');
    }
    _;
  }

  /**
   * @notice Some dust eth needs to be permanently locked to prevent potential zero divisions
   */
  constructor(address _owner, uint _flashMintFee) payable ERC20() {
    _mint(address(0), msg.value);
    owner = _owner;
    flashMintFee = _flashMintFee;
    _status = _NOT_ENTERED;
    _name = 'Xfai ETH';
    _symbol = 'XFETH';
  }

  receive() external payable {
    deposit();
  }

  /**
   * @notice Changes the isPublic status of xfETH.
   * @dev setStatus can only be called by the owner of the contract
   * @param _state The new state of the xfETH isPublic modifier
   */
  function setStatus(bool _state) external override nonReentrant onlyOwner {
    _isPublic = _state;
    emit StatusChange(_state);
  }

  /**
   * @notice Changes the arbitrageur of xfETH contract
   * @dev setArbitrageur can only be called by the owner of the contract
   * @param _arbitrageur The new owner of the xfETH contract
   */
  function setArbitrageur(address _arbitrageur) external override nonReentrant onlyOwner {
    arbitrageur = _arbitrageur;
    emit ArbitrageurChange(_arbitrageur);
  }

  /**
   * @notice Changes the owner of xfETH contract
   * @dev setOwner can only be called by the owner of the contract
   * @param _newOwner The new owner of the xfETH contract
   */
  function setOwner(address _newOwner) external override nonReentrant onlyOwner {
    owner = _newOwner;
    emit OwnerChange(_newOwner);
  }

  /**
   * @notice Changes the fee percentage of xfETH for flash minting
   * @dev setFlashMintFee can only be called by the owner of the contract
   * @param _newFee The fee of the xfETH contract
   */
  function setFlashMintFee(uint _newFee) external override nonReentrant onlyOwner {
    flashMintFee = _newFee;
    emit FeeChange(_newFee);
  }

  /**
   * @notice Returns the exchange value of _xfETHAmount in terms of ETH
   * @param _xfETHAmount The amount of xfETH
   * @return _ETH The exchange value of _xfETHAmount in terms of ETH
   */
  function xfETHToETH(uint _xfETHAmount) public view override nonReentrantRead returns (uint _ETH) {
    _ETH = _xfETHToETH(_xfETHAmount);
  }

  /**
   * @notice Returns the exchange value of _ETHAmount in terms of xfETH
   * @param _ETHAmount The amount of ETH
   * @return _xfETH The exchange value of _ETHAmount in terms of xfETH
   */
  function ETHToXfETH(uint _ETHAmount) public view override nonReentrantRead returns (uint _xfETH) {
    _xfETH = (_ETHAmount * totalSupply()) / address(this).balance;
  }

  /**
   * @notice Accepts as input ETH and returns a given amount of xfETH
   * @dev deposit is a payable function
   * @return amountInXfETH The amount of xfETH received through the deposit
   */
  function deposit() public payable override nonReentrant returns (uint amountInXfETH) {
    amountInXfETH = (msg.value * totalSupply()) / (address(this).balance - msg.value);
    _mint(msg.sender, amountInXfETH);
    emit Deposit(msg.sender, amountInXfETH, msg.value);
  }

  /**
   * @notice Accepts as input xfETH and returns a given amount of ETH
   * @return amountInETH The amount of ETH received through the withdraw
   */
  function withdraw(uint _xfETHAmount) public override nonReentrant returns (uint amountInETH) {
    amountInETH = _xfETHToETH(_xfETHAmount);
    _burn(msg.sender, _xfETHAmount);
    payable(msg.sender).transfer(amountInETH);
    emit Withdrawal(msg.sender, amountInETH);
  }

  /**
   * @notice Allows anyone to mint the token as long as the same amount + a fee get burned by the end of the transaction.
   * @param _amount The amount of xfETH to be flash minted
   */
  function flashMint(uint _amount) external override nonReentrant isPublic {
    // get current ETH balance
    uint ETHBalance = address(this).balance;
    uint xfETHTotalSupply = totalSupply();

    // compute fee
    uint fee = (_amount * flashMintFee) / 10000;

    // mint tokens
    _mint(msg.sender, _amount);

    // hand control to borrower
    IBorrower(msg.sender).executeOnFlashMint(_amount);

    // burn tokens + fee
    _burn(msg.sender, _amount + fee); // reverts if `msg.sender` does not have enough tokens to burn

    // double-check that the contract's ETH balance has not decreased
    assert(address(this).balance >= ETHBalance);

    // double-check that the contract's xfETH supply has decreased
    assert(totalSupply() < xfETHTotalSupply);

    emit FlashMint(msg.sender, _amount);
  }

  function _xfETHToETH(uint _xfETHAmount) private view returns (uint amountInETH) {
    uint balance = address(this).balance;
    amountInETH = (_xfETHAmount * balance) / totalSupply();
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "IERC20.sol";
import "IERC20Metadata.sol";
import "Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20Metadata {
  mapping(address => uint256) private _balances;

  mapping(address => mapping(address => uint256)) private _allowances;

  uint256 private _totalSupply;

  string internal _name;
  string internal _symbol;

  /**
   * @dev Sets the values for {name} and {symbol}.
   *
   * All two of these values are immutable: they can only be set once during
   * construction.
   */
  constructor() {}

  /**
   * @dev Returns the name of the token.
   */
  function name() public view virtual override returns (string memory) {
    return _name;
  }

  /**
   * @dev Returns the symbol of the token, usually a shorter version of the
   * name.
   */
  function symbol() public view virtual override returns (string memory) {
    return _symbol;
  }

  /**
   * @dev Returns the number of decimals used to get its user representation.
   * For example, if `decimals` equals `2`, a balance of `505` tokens should
   * be displayed to a user as `5.05` (`505 / 10 ** 2`).
   *
   * Tokens usually opt for a value of 18, imitating the relationship between
   * Ether and Wei. This is the default value returned by this function, unless
   * it's overridden.
   *
   * NOTE: This information is only used for _display_ purposes: it in
   * no way affects any of the arithmetic of the contract, including
   * {IERC20-balanceOf} and {IERC20-transfer}.
   */
  function decimals() public view virtual override returns (uint8) {
    return 18;
  }

  /**
   * @dev See {IERC20-totalSupply}.
   */
  function totalSupply() public view virtual override returns (uint256) {
    return _totalSupply;
  }

  /**
   * @dev See {IERC20-balanceOf}.
   */
  function balanceOf(address account) public view virtual override returns (uint256) {
    return _balances[account];
  }

  /**
   * @dev See {IERC20-transfer}.
   *
   * Requirements:
   *
   * - `to` cannot be the zero address.
   * - the caller must have a balance of at least `amount`.
   */
  function transfer(address to, uint256 amount) public virtual override returns (bool) {
    address owner = _msgSender();
    _transfer(owner, to, amount);
    return true;
  }

  /**
   * @dev See {IERC20-allowance}.
   */
  function allowance(
    address owner,
    address spender
  ) public view virtual override returns (uint256) {
    return _allowances[owner][spender];
  }

  /**
   * @dev See {IERC20-approve}.
   *
   * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
   * `transferFrom`. This is semantically equivalent to an infinite approval.
   *
   * Requirements:
   *
   * - `spender` cannot be the zero address.
   */
  function approve(address spender, uint256 amount) public virtual override returns (bool) {
    address owner = _msgSender();
    _approve(owner, spender, amount);
    return true;
  }

  /**
   * @dev See {IERC20-transferFrom}.
   *
   * Emits an {Approval} event indicating the updated allowance. This is not
   * required by the EIP. See the note at the beginning of {ERC20}.
   *
   * NOTE: Does not update the allowance if the current allowance
   * is the maximum `uint256`.
   *
   * Requirements:
   *
   * - `from` and `to` cannot be the zero address.
   * - `from` must have a balance of at least `amount`.
   * - the caller must have allowance for ``from``'s tokens of at least
   * `amount`.
   */
  function transferFrom(
    address from,
    address to,
    uint256 amount
  ) public virtual override returns (bool) {
    address spender = _msgSender();
    _spendAllowance(from, spender, amount);
    _transfer(from, to, amount);
    return true;
  }

  /**
   * @dev Atomically increases the allowance granted to `spender` by the caller.
   *
   * This is an alternative to {approve} that can be used as a mitigation for
   * problems described in {IERC20-approve}.
   *
   * Emits an {Approval} event indicating the updated allowance.
   *
   * Requirements:
   *
   * - `spender` cannot be the zero address.
   */
  function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
    address owner = _msgSender();
    _approve(owner, spender, allowance(owner, spender) + addedValue);
    return true;
  }

  /**
   * @dev Atomically decreases the allowance granted to `spender` by the caller.
   *
   * This is an alternative to {approve} that can be used as a mitigation for
   * problems described in {IERC20-approve}.
   *
   * Emits an {Approval} event indicating the updated allowance.
   *
   * Requirements:
   *
   * - `spender` cannot be the zero address.
   * - `spender` must have allowance for the caller of at least
   * `subtractedValue`.
   */
  function decreaseAllowance(
    address spender,
    uint256 subtractedValue
  ) public virtual returns (bool) {
    address owner = _msgSender();
    uint256 currentAllowance = allowance(owner, spender);
    require(currentAllowance >= subtractedValue, 'ERC20: decreased allowance below zero');
    unchecked {
      _approve(owner, spender, currentAllowance - subtractedValue);
    }

    return true;
  }

  /**
   * @dev Moves `amount` of tokens from `from` to `to`.
   *
   * This internal function is equivalent to {transfer}, and can be used to
   * e.g. implement automatic token fees, slashing mechanisms, etc.
   *
   * Emits a {Transfer} event.
   *
   * Requirements:
   *
   * - `from` cannot be the zero address.
   * - `to` cannot be the zero address.
   * - `from` must have a balance of at least `amount`.
   */
  function _transfer(address from, address to, uint256 amount) internal virtual {
    require(from != address(0), 'ERC20: transfer from the zero address');
    require(to != address(0), 'ERC20: transfer to the zero address');

    uint256 fromBalance = _balances[from];
    require(fromBalance >= amount, 'ERC20: transfer amount exceeds balance');
    unchecked {
      _balances[from] = fromBalance - amount;
      // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
      // decrementing then incrementing.
      _balances[to] += amount;
    }

    emit Transfer(from, to, amount);
  }

  /** @dev Creates `amount` tokens and assigns them to `account`, increasing
   * the total supply.
   *
   * Emits a {Transfer} event with `from` set to the zero address.
   */
  function _mint(address account, uint256 amount) internal virtual {
    _totalSupply += amount;
    unchecked {
      // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
      _balances[account] += amount;
    }
    emit Transfer(address(0), account, amount);
  }

  /**
   * @dev Destroys `amount` tokens from `account`, reducing the
   * total supply.
   *
   * Emits a {Transfer} event with `to` set to the zero address.
   *
   * Requirements:
   *
   * - `account` cannot be the zero address.
   * - `account` must have at least `amount` tokens.
   */
  function _burn(address account, uint256 amount) internal virtual {
    require(account != address(0), 'ERC20: burn from the zero address');

    uint256 accountBalance = _balances[account];
    require(accountBalance >= amount, 'ERC20: burn amount exceeds balance');
    unchecked {
      _balances[account] = accountBalance - amount;
      // Overflow not possible: amount <= accountBalance <= totalSupply.
      _totalSupply -= amount;
    }

    emit Transfer(account, address(0), amount);
  }

  /**
   * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
   *
   * This internal function is equivalent to `approve`, and can be used to
   * e.g. set automatic allowances for certain subsystems, etc.
   *
   * Emits an {Approval} event.
   *
   * Requirements:
   *
   * - `owner` cannot be the zero address.
   * - `spender` cannot be the zero address.
   */
  function _approve(address owner, address spender, uint256 amount) internal virtual {
    require(owner != address(0), 'ERC20: approve from the zero address');
    require(spender != address(0), 'ERC20: approve to the zero address');

    _allowances[owner][spender] = amount;
    emit Approval(owner, spender, amount);
  }

  /**
   * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
   *
   * Does not update the allowance amount in case of infinite allowance.
   * Revert if not enough allowance is available.
   *
   * Might emit an {Approval} event.
   */
  function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
    uint256 currentAllowance = allowance(owner, spender);
    if (currentAllowance != type(uint256).max) {
      require(currentAllowance >= amount, 'ERC20: insufficient allowance');
      unchecked {
        _approve(owner, spender, currentAllowance - amount);
      }
    }
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
  /**
   * @dev Emitted when `value` tokens are moved from one account (`from`) to
   * another (`to`).
   *
   * Note that `value` may be zero.
   */
  event Transfer(address indexed from, address indexed to, uint256 value);

  /**
   * @dev Emitted when the allowance of a `spender` for an `owner` is set by
   * a call to {approve}. `value` is the new allowance.
   */
  event Approval(address indexed owner, address indexed spender, uint256 value);

  /**
   * @dev Returns the amount of tokens in existence.
   */
  function totalSupply() external view returns (uint256);

  /**
   * @dev Returns the amount of tokens owned by `account`.
   */
  function balanceOf(address account) external view returns (uint256);

  /**
   * @dev Moves `amount` tokens from the caller's account to `to`.
   *
   * Returns a boolean value indicating whether the operation succeeded.
   *
   * Emits a {Transfer} event.
   */
  function transfer(address to, uint256 amount) external returns (bool);

  /**
   * @dev Returns the remaining number of tokens that `spender` will be
   * allowed to spend on behalf of `owner` through {transferFrom}. This is
   * zero by default.
   *
   * This value changes when {approve} or {transferFrom} are called.
   */
  function allowance(address owner, address spender) external view returns (uint256);

  /**
   * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
   *
   * Returns a boolean value indicating whether the operation succeeded.
   *
   * IMPORTANT: Beware that changing an allowance with this method brings the risk
   * that someone may use both the old and the new allowance by unfortunate
   * transaction ordering. One possible solution to mitigate this race
   * condition is to first reduce the spender's allowance to 0 and set the
   * desired value afterwards:
   * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
   *
   * Emits an {Approval} event.
   */
  function approve(address spender, uint256 amount) external returns (bool);

  /**
   * @dev Moves `amount` tokens from `from` to `to` using the
   * allowance mechanism. `amount` is then deducted from the caller's
   * allowance.
   *
   * Returns a boolean value indicating whether the operation succeeded.
   *
   * Emits a {Transfer} event.
   */
  function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
  /**
   * @dev Returns the name of the token.
   */
  function name() external view returns (string memory);

  /**
   * @dev Returns the symbol of the token.
   */
  function symbol() external view returns (string memory);

  /**
   * @dev Returns the decimals places of the token.
   */
  function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
  function _msgSender() internal view virtual returns (address) {
    return msg.sender;
  }

  function _msgData() internal view virtual returns (bytes calldata) {
    return msg.data;
  }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.19;

import "IERC20Metadata.sol";

interface IXFETH is IERC20Metadata {
  event Deposit(address indexed dst, uint amountXfETH, uint amountETH);
  event Withdrawal(address indexed src, uint amountETH);
  event FlashMint(address indexed dst, uint amountXfETH);
  event FeeChange(uint newFee);
  event OwnerChange(address newOwner);
  event ArbitrageurChange(address arbitrageur);
  event StatusChange(bool state);

  function owner() external view returns (address _owner);

  function flashMintFee() external view returns (uint _flashMintFee);

  function setStatus(bool _state) external;

  function setOwner(address _newOwner) external;

  function setArbitrageur(address _arbitrageur) external;

  function setFlashMintFee(uint _newFee) external;

  function xfETHToETH(uint _xfETHAmount) external view returns (uint _ETH);

  function ETHToXfETH(uint _ETHAmount) external view returns (uint _xfETH);

  function deposit() external payable returns (uint amountInXfETH);

  function withdraw(uint _liquidity) external returns (uint amountInETH);

  function flashMint(uint _amount) external;
}

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity ^0.8.19;

interface IBorrower {
  function executeOnFlashMint(uint _amount) external;
}

{
  "evmVersion": "london",
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "libraries": {
    "xfETH.sol": {}
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_xfETHAmount","type":"uint256"}],"name":"withdraw","outputs":[{"internalType":"uint256","name":"amountInETH","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_xfETHAmount","type":"uint256"}],"name":"xfETHToETH","outputs":[{"internalType":"uint256","name":"_ETH","type":"uint256"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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0000000000000000000000001d3dc4b584bc687fb3c9adc1761858694728b1b3000000000000000000000000000000000000000000000000000000000000000a

-----Decoded View---------------
Arg [0] : _owner (address): 0x1D3DC4b584bc687fB3C9AdC1761858694728B1b3
Arg [1] : _flashMintFee (uint256): 10

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000001d3dc4b584bc687fb3c9adc1761858694728b1b3
Arg [1] : 000000000000000000000000000000000000000000000000000000000000000a