pragma solidity ^0.6.0;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "../Constants.sol";
contract CommonAdapter {
    using SafeERC20 for IERC20;
    using Address for address;
    using Address for address payable;
    /**
     * @dev Performs a swap
     * @param recipient The original msg.sender performing the swap
     * @param aggregator Address of the aggregator's contract
     * @param spender Address to which tokens will be approved
     * @param method Selector of the function to be called in the aggregator's contract
     * @param tokenFrom Token to be swapped
     * @param tokenTo Token to be received
     * @param amountFrom Amount of tokenFrom to swap
     * @param amountTo Minimum amount of tokenTo to receive
     * @param data Data used for the call made to the aggregator's contract
     */
    function swap(
        address payable recipient,
        address aggregator,
        address spender,
        bytes4 method,
        IERC20 tokenFrom,
        IERC20 tokenTo,
        uint256 amountFrom,
        uint256 amountTo,
        bytes calldata data
    ) external payable {
        require(tokenFrom != tokenTo, "TOKEN_PAIR_INVALID");
        if (address(tokenFrom) != Constants.ETH) {
            _approveSpender(tokenFrom, spender, amountFrom);
        }
        // We always forward msg.value as it may be necessary to pay fees
        bytes memory encodedData = abi.encodePacked(method, data);
        aggregator.functionCallWithValue(encodedData, msg.value);
        // Transfer remaining balance of tokenFrom to sender
        if (address(tokenFrom) != Constants.ETH) {
            uint256 balance = tokenFrom.balanceOf(address(this));
            _transfer(tokenFrom, balance, recipient);
        }
        uint256 weiBalance = address(this).balance;
        // Transfer remaining balance of tokenTo to sender
        if (address(tokenTo) != Constants.ETH) {
            uint256 balance = tokenTo.balanceOf(address(this));
            require(balance >= amountTo, "INSUFFICIENT_AMOUNT");
            _transfer(tokenTo, balance, recipient);
        } else {
            // If tokenTo == ETH, then check that the remaining ETH balance >= amountTo
            require(weiBalance >= amountTo, "INSUFFICIENT_AMOUNT");
        }
        // If there are unused fees or if tokenTo is ETH, transfer to sender
        if (weiBalance > 0) {
            recipient.sendValue(weiBalance);
        }
    }
    /**
     * @dev Transfers token to sender if amount > 0
     * @param token IERC20 token to transfer to sender
     * @param amount Amount of token to transfer
     * @param recipient Address that will receive the tokens
     */
    function _transfer(
        IERC20 token,
        uint256 amount,
        address recipient
    ) internal {
        if (amount > 0) {
            token.safeTransfer(recipient, amount);
        }
    }
    // https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/SafeERC20.sol
    /**
     * @dev Approves max amount of token to the spender if the allowance is lower than amount
     * @param token The ERC20 token to approve
     * @param spender Address to which funds will be approved
     * @param amount Amount used to compare current allowance
     */
    function _approveSpender(
        IERC20 token,
        address spender,
        uint256 amount
    ) internal {
        // If allowance is not enough, approve max possible amount
        uint256 allowance = token.allowance(address(this), spender);
        if (allowance < amount) {
            bytes memory returndata = address(token).functionCall(
                abi.encodeWithSelector(
                    token.approve.selector,
                    spender,
                    type(uint256).max
                )
            );
            if (returndata.length > 0) {
                // Return data is optional
                require(abi.decode(returndata, (bool)), "APPROVAL_FAILED");
            }
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender, address recipient, uint256 amount) external returns (bool);
    /**
     * @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);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";
/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }
    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }
    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.
        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }
    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;
        return c;
    }
    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }
    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold
        return c;
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }
    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.2;
/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.
        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }
    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
library Constants {
    address internal constant ETH = 0x0000000000000000000000000000000000000000;
}
pragma solidity ^0.6.0;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "../Constants.sol";
contract FeeCommonAdapter {
    using SafeERC20 for IERC20;
    using Address for address;
    using Address for address payable;
    using SafeMath for uint256;
    // solhint-disable-next-line var-name-mixedcase
    address payable public immutable FEE_WALLET;
    constructor(address payable feeWallet) public {
        FEE_WALLET = feeWallet;
    }
    /**
     * @dev Performs a swap
     * @param recipient The original msg.sender performing the swap
     * @param aggregator Address of the aggregator's contract
     * @param spender Address to which tokens will be approved
     * @param method Selector of the function to be called in the aggregator's contract
     * @param tokenFrom Token to be swapped
     * @param tokenTo Token to be received
     * @param amountFrom Amount of tokenFrom to swap
     * @param amountTo Minimum amount of tokenTo to receive
     * @param data Data used for the call made to the aggregator's contract
     * @param fee Amount of tokenFrom sent to the fee wallet
     */
    function swap(
        address payable recipient,
        address aggregator,
        address spender,
        bytes4 method,
        IERC20 tokenFrom,
        IERC20 tokenTo,
        uint256 amountFrom,
        uint256 amountTo,
        bytes calldata data,
        uint256 fee
    ) external payable {
        require(tokenFrom != tokenTo, "TOKEN_PAIR_INVALID");
        if (address(tokenFrom) == Constants.ETH) {
            FEE_WALLET.sendValue(fee);
        } else {
            _transfer(tokenFrom, fee, FEE_WALLET);
            _approveSpender(tokenFrom, spender, amountFrom);
        }
        // We always forward msg.value as it may be necessary to pay fees
        aggregator.functionCallWithValue(
            abi.encodePacked(method, data),
            address(this).balance
        );
        // Transfer remaining balance of tokenFrom to sender
        if (address(tokenFrom) != Constants.ETH) {
            _transfer(tokenFrom, tokenFrom.balanceOf(address(this)), recipient);
        }
        uint256 weiBalance = address(this).balance;
        // Transfer remaining balance of tokenTo to sender
        if (address(tokenTo) != Constants.ETH) {
            uint256 balance = tokenTo.balanceOf(address(this));
            require(balance >= amountTo, "INSUFFICIENT_AMOUNT");
            _transfer(tokenTo, balance, recipient);
        } else {
            // If tokenTo == ETH, then check that the remaining ETH balance >= amountTo
            require(weiBalance >= amountTo, "INSUFFICIENT_AMOUNT");
        }
        // If there are unused fees or if tokenTo is ETH, transfer to sender
        if (weiBalance > 0) {
            recipient.sendValue(weiBalance);
        }
    }
    /**
     * @dev Transfers token to sender if amount > 0
     * @param token IERC20 token to transfer to sender
     * @param amount Amount of token to transfer
     * @param recipient Address that will receive the tokens
     */
    function _transfer(
        IERC20 token,
        uint256 amount,
        address recipient
    ) internal {
        if (amount > 0) {
            token.safeTransfer(recipient, amount);
        }
    }
    // https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/SafeERC20.sol
    /**
     * @dev Approves max amount of token to the spender if the allowance is lower than amount
     * @param token The ERC20 token to approve
     * @param spender Address to which funds will be approved
     * @param amount Amount used to compare current allowance
     */
    function _approveSpender(
        IERC20 token,
        address spender,
        uint256 amount
    ) internal {
        // If allowance is not enough, approve max possible amount
        uint256 allowance = token.allowance(address(this), spender);
        if (allowance < amount) {
            bytes memory returndata = address(token).functionCall(
                abi.encodeWithSelector(
                    token.approve.selector,
                    spender,
                    type(uint256).max
                )
            );
            if (returndata.length > 0) {
                // Return data is optional
                require(abi.decode(returndata, (bool)), "APPROVAL_FAILED");
            }
        }
    }
}
pragma solidity ^0.6.0;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "../Constants.sol";
import "../IWETH.sol";
contract FeeWethAdapter {
    using SafeERC20 for IERC20;
    using Address for address;
    using Address for address payable;
    using SafeMath for uint256;
    IWETH public immutable weth;
    // solhint-disable-next-line var-name-mixedcase
    address payable public immutable FEE_WALLET;
    constructor(IWETH _weth, address payable feeWallet) public {
        weth = _weth;
        FEE_WALLET = feeWallet;
    }
    /**
     * @dev Performs a swap
     * @param recipient The original msg.sender performing the swap
     * @param aggregator Address of the aggregator's contract
     * @param spender Address to which tokens will be approved
     * @param method Selector of the function to be called in the aggregator's contract
     * @param tokenFrom Token to be swapped
     * @param tokenTo Token to be received
     * @param amountFrom Amount of tokenFrom to swap
     * @param amountTo Minimum amount of tokenTo to receive
     * @param data Data used for the call made to the aggregator's contract
     * @param fee Amount of tokenFrom sent to the fee wallet
     */
    function swap(
        address payable recipient,
        address aggregator,
        address spender,
        bytes4 method,
        IERC20 tokenFrom,
        IERC20 tokenTo,
        uint256 amountFrom,
        uint256 amountTo,
        bytes calldata data,
        uint256 fee
    ) external payable {
        require(tokenFrom != tokenTo, "TOKEN_PAIR_INVALID");
        if (address(tokenFrom) == Constants.ETH) {
            FEE_WALLET.sendValue(fee);
            // If tokenFrom is ETH, msg.value = fee + amountFrom (total fee could be 0)
            // Can't deal with ETH, convert to WETH, the remaining balance will be the fee
            weth.deposit{value: amountFrom}();
            _approveSpender(weth, spender, amountFrom);
        } else {
            _transfer(tokenFrom, fee, FEE_WALLET);
            // Otherwise capture tokens from sender
            _approveSpender(tokenFrom, spender, amountFrom);
        }
        // Perform the swap
        aggregator.functionCallWithValue(
            abi.encodePacked(method, data),
            address(this).balance
        );
        // Transfer remaining balance of tokenFrom to sender
        if (address(tokenFrom) != Constants.ETH) {
            _transfer(tokenFrom, tokenFrom.balanceOf(address(this)), recipient);
        } else {
            // If using ETH, just unwrap any remaining WETH
            // At the end of this function all ETH will be transferred to the sender
            _unwrapWETH();
        }
        uint256 weiBalance = address(this).balance;
        // Transfer remaining balance of tokenTo to sender
        if (address(tokenTo) != Constants.ETH) {
            uint256 balance = tokenTo.balanceOf(address(this));
            require(balance >= amountTo, "INSUFFICIENT_AMOUNT");
            _transfer(tokenTo, balance, recipient);
        } else {
            // If tokenTo == ETH, unwrap received WETH and add it to the wei balance,
            // then check that the remaining ETH balance >= amountTo
            // It is safe to not use safeMath as no one can have enough Ether to overflow
            weiBalance += _unwrapWETH();
            require(weiBalance >= amountTo, "INSUFFICIENT_AMOUNT");
        }
        // If there are unused fees or if tokenTo is ETH, transfer to sender
        if (weiBalance > 0) {
            recipient.sendValue(weiBalance);
        }
    }
    /**
     * @dev Unwraps all available WETH into ETH
     */
    function _unwrapWETH() internal returns (uint256) {
        uint256 balance = weth.balanceOf(address(this));
        weth.withdraw(balance);
        return balance;
    }
    /**
     * @dev Transfers token to sender if amount > 0
     * @param token IERC20 token to transfer to sender
     * @param amount Amount of token to transfer
     * @param recipient Address that will receive the tokens
     */
    function _transfer(
        IERC20 token,
        uint256 amount,
        address recipient
    ) internal {
        if (amount > 0) {
            token.safeTransfer(recipient, amount);
        }
    }
    // https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/SafeERC20.sol
    /**
     * @dev Approves max amount of token to the spender if the allowance is lower than amount
     * @param token The ERC20 token to approve
     * @param spender Address to which funds will be approved
     * @param amount Amount used to compare current allowance
     */
    function _approveSpender(
        IERC20 token,
        address spender,
        uint256 amount
    ) internal {
        // If allowance is not enough, approve max possible amount
        uint256 allowance = token.allowance(address(this), spender);
        if (allowance < amount) {
            bytes memory returndata = address(token).functionCall(
                abi.encodeWithSelector(
                    token.approve.selector,
                    spender,
                    type(uint256).max
                )
            );
            if (returndata.length > 0) {
                // Return data is optional
                require(abi.decode(returndata, (bool)), "APPROVAL_FAILED");
            }
        }
    }
}
pragma solidity ^0.6.0;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
interface IWETH is IERC20 {
    function deposit() external payable;
    function withdraw(uint256) external;
}
pragma solidity ^0.6.0;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol";
import "../Constants.sol";
contract UniswapAdapter {
    using SafeERC20 for IERC20;
    using Address for address;
    using Address for address payable;
    using SafeMath for uint256;
    // solhint-disable-next-line var-name-mixedcase
    IUniswapV2Router02 public immutable UNISWAP;
    // solhint-disable-next-line var-name-mixedcase
    address payable public immutable FEE_WALLET;
    constructor(address payable feeWallet, IUniswapV2Router02 uniswap) public {
        FEE_WALLET = feeWallet;
        UNISWAP = uniswap;
    }
    /**
     * @dev Performs a swap
     * @param recipient The original msg.sender performing the swap
     * @param tokenFrom Token to be swapped
     * @param tokenTo Token to be received
     * @param amountFrom Amount of tokenFrom to swap
     * @param amountTo Minimum amount of tokenTo to receive
     * @param path Used by Uniswap
     * @param deadline Timestamp at which the swap becomes invalid. Used by Uniswap
     * @param feeOnTransfer Use `supportingFeeOnTransfer` Uniswap methods
     * @param fee Amount of tokenFrom sent to the fee wallet
     */
    function swap(
        address payable recipient,
        IERC20 tokenFrom,
        IERC20 tokenTo,
        uint256 amountFrom,
        uint256 amountTo,
        address[] calldata path,
        uint256 deadline,
        bool feeOnTransfer,
        uint256 fee
    ) external payable {
        require(tokenFrom != tokenTo, "TOKEN_PAIR_INVALID");
        if (address(tokenFrom) == Constants.ETH) {
            FEE_WALLET.sendValue(fee);
        } else {
            _transfer(tokenFrom, fee, FEE_WALLET);
        }
        if (address(tokenFrom) == Constants.ETH) {
            if (feeOnTransfer) {
                UNISWAP.swapExactETHForTokensSupportingFeeOnTransferTokens{
                    value: address(this).balance
                }(amountTo, path, address(this), deadline);
            } else {
                UNISWAP.swapExactETHForTokens{value: address(this).balance}(
                    amountTo,
                    path,
                    address(this),
                    deadline
                );
            }
        } else {
            _approveSpender(tokenFrom, address(UNISWAP), amountFrom);
            if (address(tokenTo) == Constants.ETH) {
                if (feeOnTransfer) {
                    UNISWAP.swapExactTokensForETHSupportingFeeOnTransferTokens(
                        amountFrom,
                        amountTo,
                        path,
                        address(this),
                        deadline
                    );
                } else {
                    UNISWAP.swapExactTokensForETH(
                        amountFrom,
                        amountTo,
                        path,
                        address(this),
                        deadline
                    );
                }
            } else {
                if (feeOnTransfer) {
                    UNISWAP
                        .swapExactTokensForTokensSupportingFeeOnTransferTokens(
                        amountFrom,
                        amountTo,
                        path,
                        address(this),
                        deadline
                    );
                } else {
                    UNISWAP.swapExactTokensForTokens(
                        amountFrom,
                        amountTo,
                        path,
                        address(this),
                        deadline
                    );
                }
            }
        }
        // Transfer remaining balance of tokenFrom to sender
        if (address(tokenFrom) != Constants.ETH) {
            _transfer(tokenFrom, tokenFrom.balanceOf(address(this)), recipient);
        }
        uint256 weiBalance = address(this).balance;
        // Transfer remaining balance of tokenTo to sender
        if (address(tokenTo) != Constants.ETH) {
            uint256 balance = tokenTo.balanceOf(address(this));
            require(balance >= amountTo, "INSUFFICIENT_AMOUNT");
            _transfer(tokenTo, balance, recipient);
        } else {
            // If tokenTo == ETH, then check that the remaining ETH balance >= amountTo
            require(weiBalance >= amountTo, "INSUFFICIENT_AMOUNT");
        }
        // If there are unused fees or if tokenTo is ETH, transfer to sender
        if (weiBalance > 0) {
            recipient.sendValue(weiBalance);
        }
    }
    /**
     * @dev Transfers token to sender if amount > 0
     * @param token IERC20 token to transfer to sender
     * @param amount Amount of token to transfer
     * @param recipient Address that will receive the tokens
     */
    function _transfer(
        IERC20 token,
        uint256 amount,
        address recipient
    ) internal {
        if (amount > 0) {
            token.safeTransfer(recipient, amount);
        }
    }
    // https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/SafeERC20.sol
    /**
     * @dev Approves max amount of token to the spender if the allowance is lower than amount
     * @param token The ERC20 token to approve
     * @param spender Address to which funds will be approved
     * @param amount Amount used to compare current allowance
     */
    function _approveSpender(
        IERC20 token,
        address spender,
        uint256 amount
    ) internal {
        // If allowance is not enough, approve max possible amount
        uint256 allowance = token.allowance(address(this), spender);
        if (allowance < amount) {
            bytes memory returndata = address(token).functionCall(
                abi.encodeWithSelector(
                    token.approve.selector,
                    spender,
                    type(uint256).max
                )
            );
            if (returndata.length > 0) {
                // Return data is optional
                require(abi.decode(returndata, (bool)), "APPROVAL_FAILED");
            }
        }
    }
}
pragma solidity >=0.6.2;
import './IUniswapV2Router01.sol';
interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);
    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}
pragma solidity >=0.6.2;
interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}
pragma solidity ^0.6.0;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "../Constants.sol";
import "../IWETH.sol";
contract WethAdapter {
    using SafeERC20 for IERC20;
    using Address for address;
    using Address for address payable;
    IWETH public immutable weth;
    constructor(IWETH _weth) public {
        weth = _weth;
    }
    /**
     * @dev Performs a swap
     * @param recipient The original msg.sender performing the swap
     * @param aggregator Address of the aggregator's contract
     * @param spender Address to which tokens will be approved
     * @param method Selector of the function to be called in the aggregator's contract
     * @param tokenFrom Token to be swapped
     * @param tokenTo Token to be received
     * @param amountFrom Amount of tokenFrom to swap
     * @param amountTo Minimum amount of tokenTo to receive
     * @param data Data used for the call made to the aggregator's contract
     */
    function swap(
        address payable recipient,
        address aggregator,
        address spender,
        bytes4 method,
        IERC20 tokenFrom,
        IERC20 tokenTo,
        uint256 amountFrom,
        uint256 amountTo,
        bytes calldata data
    ) external payable {
        require(tokenFrom != tokenTo, "TOKEN_PAIR_INVALID");
        if (address(tokenFrom) == Constants.ETH) {
            // If tokenFrom is ETH, msg.value = fee + amountFrom (total fee could be 0)
            // Can't deal with ETH, convert to WETH, the remaining balance will be the fee
            weth.deposit{value: amountFrom}();
            _approveSpender(weth, spender, amountFrom);
        } else {
            // Otherwise capture tokens from sender
            _approveSpender(tokenFrom, spender, amountFrom);
        }
        // Perform the swap
        aggregator.functionCallWithValue(
            abi.encodePacked(method, data),
            address(this).balance
        );
        // Transfer remaining balance of tokenFrom to sender
        if (address(tokenFrom) != Constants.ETH) {
            _transfer(tokenFrom, tokenFrom.balanceOf(address(this)), recipient);
        } else {
            // If using ETH, just unwrap any remaining WETH
            // At the end of this function all ETH will be transferred to the sender
            _unwrapWETH();
        }
        uint256 weiBalance = address(this).balance;
        // Transfer remaining balance of tokenTo to sender
        if (address(tokenTo) != Constants.ETH) {
            uint256 balance = tokenTo.balanceOf(address(this));
            require(balance >= amountTo, "INSUFFICIENT_AMOUNT");
            _transfer(tokenTo, balance, recipient);
        } else {
            // If tokenTo == ETH, unwrap received WETH and add it to the wei balance,
            // then check that the remaining ETH balance >= amountTo
            // It is safe to not use safeMath as no one can have enough Ether to overflow
            weiBalance += _unwrapWETH();
            require(weiBalance >= amountTo, "INSUFFICIENT_AMOUNT");
        }
        // If there are unused fees or if tokenTo is ETH, transfer to sender
        if (weiBalance > 0) {
            recipient.sendValue(weiBalance);
        }
    }
    /**
     * @dev Unwraps all available WETH into ETH
     */
    function _unwrapWETH() internal returns (uint256) {
        uint256 balance = weth.balanceOf(address(this));
        weth.withdraw(balance);
        return balance;
    }
    /**
     * @dev Transfers token to sender if amount > 0
     * @param token IERC20 token to transfer to sender
     * @param amount Amount of token to transfer
     * @param recipient Address that will receive the tokens
     */
    function _transfer(
        IERC20 token,
        uint256 amount,
        address recipient
    ) internal {
        if (amount > 0) {
            token.safeTransfer(recipient, amount);
        }
    }
    // https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/SafeERC20.sol
    /**
     * @dev Approves max amount of token to the spender if the allowance is lower than amount
     * @param token The ERC20 token to approve
     * @param spender Address to which funds will be approved
     * @param amount Amount used to compare current allowance
     */
    function _approveSpender(
        IERC20 token,
        address spender,
        uint256 amount
    ) internal {
        // If allowance is not enough, approve max possible amount
        uint256 allowance = token.allowance(address(this), spender);
        if (allowance < amount) {
            bytes memory returndata = address(token).functionCall(
                abi.encodeWithSelector(
                    token.approve.selector,
                    spender,
                    type(uint256).max
                )
            );
            if (returndata.length > 0) {
                // Return data is optional
                require(abi.decode(returndata, (bool)), "APPROVAL_FAILED");
            }
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
interface ICHI is IERC20 {
    function freeUpTo(uint256 value) external returns (uint256);
    function freeFromUpTo(
        address from,
        uint256 value
    ) external returns (uint256);
    function mint(uint256 value) external;
}
  
// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.6.0;
// We import the contract so truffle compiles it, and we have the ABI
// available when working from truffle console.
import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; //helpers// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
import "../../GSN/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.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.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of 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, IERC20 {
    using SafeMath for uint256;
    using Address for address;
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    uint256 private _totalSupply;
    string private _name;
    string private _symbol;
    uint8 private _decimals;
    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol) public {
        _name = name;
        _symbol = symbol;
        _decimals = 18;
    }
    /**
     * @dev Returns the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }
    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view 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 value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * 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 returns (uint8) {
        return _decimals;
    }
    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }
    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }
    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, 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}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), 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};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        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) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(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) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }
    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is 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:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        _beforeTokenTransfer(sender, recipient, amount);
        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, 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.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");
        _beforeTokenTransfer(address(0), account, amount);
        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(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");
        _beforeTokenTransfer(account, address(0), amount);
        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(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 Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }
    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
/*
 * @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 GSN 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 payable) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Pausable.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "./ICHI.sol";
import "./Spender.sol";
/**
 * @title MetaSwap
 */
contract MetaSwap is Ownable, Pausable, ReentrancyGuard {
    using SafeERC20 for IERC20;
    using Address for address;
    using Address for address payable;
    struct Adapter {
        address addr; // adapter's address
        bytes4 selector;
        bytes data; // adapter's fixed data
    }
    ICHI public immutable chi;
    Spender public immutable spender;
    // Mapping of aggregatorId to aggregator
    mapping(string => Adapter) public adapters;
    mapping(string => bool) public adapterRemoved;
    event AdapterSet(
        string indexed aggregatorId,
        address indexed addr,
        bytes4 selector,
        bytes data
    );
    event AdapterRemoved(string indexed aggregatorId);
    event Swap(string indexed aggregatorId, address indexed sender);
    constructor(ICHI _chi) public {
        chi = _chi;
        spender = new Spender();
    }
    /**
     * @dev Sets the adapter for an aggregator. It can't be changed later.
     * @param aggregatorId Aggregator's identifier
     * @param addr Address of the contract that contains the logic for this aggregator
     * @param selector The function selector of the swap function in the adapter
     * @param data Fixed abi encoded data the will be passed in each delegatecall made to the adapter
     */
    function setAdapter(
        string calldata aggregatorId,
        address addr,
        bytes4 selector,
        bytes calldata data
    ) external onlyOwner {
        require(addr.isContract(), "ADAPTER_IS_NOT_A_CONTRACT");
        require(!adapterRemoved[aggregatorId], "ADAPTER_REMOVED");
        Adapter storage adapter = adapters[aggregatorId];
        require(adapter.addr == address(0), "ADAPTER_EXISTS");
        adapter.addr = addr;
        adapter.selector = selector;
        adapter.data = data;
        emit AdapterSet(aggregatorId, addr, selector, data);
    }
    /**
     * @dev Removes the adapter for an existing aggregator. This can't be undone.
     * @param aggregatorId Aggregator's identifier
     */
    function removeAdapter(string calldata aggregatorId) external onlyOwner {
        require(
            adapters[aggregatorId].addr != address(0),
            "ADAPTER_DOES_NOT_EXIST"
        );
        delete adapters[aggregatorId];
        adapterRemoved[aggregatorId] = true;
        emit AdapterRemoved(aggregatorId);
    }
    /**
     * @dev Performs a swap
     * @param aggregatorId Identifier of the aggregator to be used for the swap
     * @param data Dynamic data which is concatenated with the fixed aggregator's
     * data in the delecatecall made to the adapter
     */
    function swap(
        string calldata aggregatorId,
        IERC20 tokenFrom,
        uint256 amount,
        bytes calldata data
    ) external payable whenNotPaused nonReentrant {
        _swap(aggregatorId, tokenFrom, amount, data);
    }
    /**
     * @dev Performs a swap
     * @param aggregatorId Identifier of the aggregator to be used for the swap
     * @param data Dynamic data which is concatenated with the fixed aggregator's
     * data in the delecatecall made to the adapter
     */
    function swapUsingGasToken(
        string calldata aggregatorId,
        IERC20 tokenFrom,
        uint256 amount,
        bytes calldata data
    ) external payable whenNotPaused nonReentrant {
        uint256 gas = gasleft();
        _swap(aggregatorId, tokenFrom, amount, data);
        uint256 gasSpent = 21000 + gas - gasleft() + 16 * msg.data.length;
        chi.freeFromUpTo(msg.sender, (gasSpent + 14154) / 41947);
    }
    function pauseSwaps() external onlyOwner {
        _pause();
    }
    function unpauseSwaps() external onlyOwner {
        _unpause();
    }
    function _swap(
        string calldata aggregatorId,
        IERC20 tokenFrom,
        uint256 amount,
        bytes calldata data
    ) internal {
        Adapter storage adapter = adapters[aggregatorId];
        if (address(tokenFrom) != Constants.ETH) {
            tokenFrom.safeTransferFrom(msg.sender, address(spender), amount);
        }
        spender.swap{value: msg.value}(
            adapter.addr,
            abi.encodePacked(
                adapter.selector,
                abi.encode(msg.sender),
                adapter.data,
                data
            )
        );
        emit Swap(aggregatorId, msg.sender);
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
import "../GSN/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }
    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
import "../GSN/Context.sol";
/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);
    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);
    bool private _paused;
    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor () internal {
        _paused = false;
    }
    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view returns (bool) {
        return _paused;
    }
    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!_paused, "Pausable: paused");
        _;
    }
    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(_paused, "Pausable: not paused");
        _;
    }
    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }
    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.
    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;
    uint256 private _status;
    constructor () internal {
        _status = _NOT_ENTERED;
    }
    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
        _;
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
import "./Constants.sol";
contract Spender {
    address public immutable metaswap;
    constructor() public {
        metaswap = msg.sender;
    }
    /// @dev Receives ether from swaps
    fallback() external payable {}
    function swap(address adapter, bytes calldata data) external payable {
        require(msg.sender == metaswap, "FORBIDDEN");
        require(adapter != address(0), "ADAPTER_NOT_PROVIDED");
        _delegate(adapter, data, "ADAPTER_DELEGATECALL_FAILED");
    }
    /**
     * @dev Performs a delegatecall and bubbles up the errors, adapted from
     * https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/Address.sol
     * @param target Address of the contract to delegatecall
     * @param data Data passed in the delegatecall
     * @param errorMessage Fallback revert reason
     */
    function _delegate(
        address target,
        bytes memory data,
        string memory errorMessage
    ) private returns (bytes memory) {
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
pragma solidity ^0.6.0;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/utils/Address.sol";
contract MockAdapter {
    using SafeERC20 for IERC20;
    using Address for address;
    using Address for address payable;
    event MockAdapterEvent(
        address sender,
        uint256 valueFixed,
        uint256 valueDynamic
    );
    function test(
        address sender,
        uint256 valueFixed,
        uint256 valueDynamic
    ) external payable {
        emit MockAdapterEvent(sender, valueFixed, valueDynamic);
    }
    function testRevert(
        address,
        uint256,
        uint256
    ) external payable {
        revert("SWAP_FAILED");
    }
    function testRevertNoReturnData(
        address,
        uint256,
        uint256
    ) external payable {
        revert();
    }
}
pragma solidity ^0.6.0;
// TAKEN FROM https://github.com/gnosis/mock-contract
// TODO: use their npm package once it is published for solidity 0.6
interface MockInterface {
    /**
     * @dev After calling this method, the mock will return `response` when it is called
     * with any calldata that is not mocked more specifically below
     * (e.g. using givenMethodReturn).
     * @param response ABI encoded response that will be returned if method is invoked
     */
    function givenAnyReturn(bytes calldata response) external;
    function givenAnyReturnBool(bool response) external;
    function givenAnyReturnUint(uint256 response) external;
    function givenAnyReturnAddress(address response) external;
    function givenAnyRevert() external;
    function givenAnyRevertWithMessage(string calldata message) external;
    function givenAnyRunOutOfGas() external;
    /**
     * @dev After calling this method, the mock will return `response` when the given
     * methodId is called regardless of arguments. If the methodId and arguments
     * are mocked more specifically (using `givenMethodAndArguments`) the latter
     * will take precedence.
     * @param method ABI encoded methodId. It is valid to pass full calldata (including arguments). The mock will extract the methodId from it
     * @param response ABI encoded response that will be returned if method is invoked
     */
    function givenMethodReturn(bytes calldata method, bytes calldata response)
        external;
    function givenMethodReturnBool(bytes calldata method, bool response)
        external;
    function givenMethodReturnUint(bytes calldata method, uint256 response)
        external;
    function givenMethodReturnAddress(bytes calldata method, address response)
        external;
    function givenMethodRevert(bytes calldata method) external;
    function givenMethodRevertWithMessage(
        bytes calldata method,
        string calldata message
    ) external;
    function givenMethodRunOutOfGas(bytes calldata method) external;
    /**
     * @dev After calling this method, the mock will return `response` when the given
     * methodId is called with matching arguments. These exact calldataMocks will take
     * precedence over all other calldataMocks.
     * @param call ABI encoded calldata (methodId and arguments)
     * @param response ABI encoded response that will be returned if contract is invoked with calldata
     */
    function givenCalldataReturn(bytes calldata call, bytes calldata response)
        external;
    function givenCalldataReturnBool(bytes calldata call, bool response)
        external;
    function givenCalldataReturnUint(bytes calldata call, uint256 response)
        external;
    function givenCalldataReturnAddress(bytes calldata call, address response)
        external;
    function givenCalldataRevert(bytes calldata call) external;
    function givenCalldataRevertWithMessage(
        bytes calldata call,
        string calldata message
    ) external;
    function givenCalldataRunOutOfGas(bytes calldata call) external;
    /**
     * @dev Returns the number of times anything has been called on this mock since last reset
     */
    function invocationCount() external returns (uint256);
    /**
     * @dev Returns the number of times the given method has been called on this mock since last reset
     * @param method ABI encoded methodId. It is valid to pass full calldata (including arguments). The mock will extract the methodId from it
     */
    function invocationCountForMethod(bytes calldata method)
        external
        returns (uint256);
    /**
     * @dev Returns the number of times this mock has been called with the exact calldata since last reset.
     * @param call ABI encoded calldata (methodId and arguments)
     */
    function invocationCountForCalldata(bytes calldata call)
        external
        returns (uint256);
    /**
     * @dev Resets all mocked methods and invocation counts.
     */
    function reset() external;
}
/**
 * Implementation of the MockInterface.
 */
contract MockContract is MockInterface {
    enum MockType {Return, Revert, OutOfGas}
    bytes32 public constant MOCKS_LIST_START = hex"01";
    bytes public constant MOCKS_LIST_END = "0xff";
    bytes32 public constant MOCKS_LIST_END_HASH = keccak256(MOCKS_LIST_END);
    bytes4 public constant SENTINEL_ANY_MOCKS = hex"01";
    bytes public constant DEFAULT_FALLBACK_VALUE = abi.encode(false);
    // A linked list allows easy iteration and inclusion checks
    mapping(bytes32 => bytes) calldataMocks;
    mapping(bytes => MockType) calldataMockTypes;
    mapping(bytes => bytes) calldataExpectations;
    mapping(bytes => string) calldataRevertMessage;
    mapping(bytes32 => uint256) calldataInvocations;
    mapping(bytes4 => bytes4) methodIdMocks;
    mapping(bytes4 => MockType) methodIdMockTypes;
    mapping(bytes4 => bytes) methodIdExpectations;
    mapping(bytes4 => string) methodIdRevertMessages;
    mapping(bytes32 => uint256) methodIdInvocations;
    MockType fallbackMockType;
    bytes fallbackExpectation = DEFAULT_FALLBACK_VALUE;
    string fallbackRevertMessage;
    uint256 invocations;
    uint256 resetCount;
    constructor() public {
        calldataMocks[MOCKS_LIST_START] = MOCKS_LIST_END;
        methodIdMocks[SENTINEL_ANY_MOCKS] = SENTINEL_ANY_MOCKS;
    }
    function trackCalldataMock(bytes memory call) private {
        bytes32 callHash = keccak256(call);
        if (calldataMocks[callHash].length == 0) {
            calldataMocks[callHash] = calldataMocks[MOCKS_LIST_START];
            calldataMocks[MOCKS_LIST_START] = call;
        }
    }
    function trackMethodIdMock(bytes4 methodId) private {
        if (methodIdMocks[methodId] == 0x0) {
            methodIdMocks[methodId] = methodIdMocks[SENTINEL_ANY_MOCKS];
            methodIdMocks[SENTINEL_ANY_MOCKS] = methodId;
        }
    }
    function _givenAnyReturn(bytes memory response) internal {
        fallbackMockType = MockType.Return;
        fallbackExpectation = response;
    }
    function givenAnyReturn(bytes calldata response) external override {
        _givenAnyReturn(response);
    }
    function givenAnyReturnBool(bool response) external override {
        uint256 flag = response ? 1 : 0;
        _givenAnyReturn(uintToBytes(flag));
    }
    function givenAnyReturnUint(uint256 response) external override {
        _givenAnyReturn(uintToBytes(response));
    }
    function givenAnyReturnAddress(address response) external override {
        _givenAnyReturn(uintToBytes(uint256(response)));
    }
    function givenAnyRevert() external override {
        fallbackMockType = MockType.Revert;
        fallbackRevertMessage = "";
    }
    function givenAnyRevertWithMessage(string calldata message)
        external
        override
    {
        fallbackMockType = MockType.Revert;
        fallbackRevertMessage = message;
    }
    function givenAnyRunOutOfGas() external override {
        fallbackMockType = MockType.OutOfGas;
    }
    function _givenCalldataReturn(bytes memory call, bytes memory response)
        private
    {
        calldataMockTypes[call] = MockType.Return;
        calldataExpectations[call] = response;
        trackCalldataMock(call);
    }
    function givenCalldataReturn(bytes calldata call, bytes calldata response)
        external
        override
    {
        _givenCalldataReturn(call, response);
    }
    function givenCalldataReturnBool(bytes calldata call, bool response)
        external
        override
    {
        uint256 flag = response ? 1 : 0;
        _givenCalldataReturn(call, uintToBytes(flag));
    }
    function givenCalldataReturnUint(bytes calldata call, uint256 response)
        external
        override
    {
        _givenCalldataReturn(call, uintToBytes(response));
    }
    function givenCalldataReturnAddress(bytes calldata call, address response)
        external
        override
    {
        _givenCalldataReturn(call, uintToBytes(uint256(response)));
    }
    function _givenMethodReturn(bytes memory call, bytes memory response)
        private
    {
        bytes4 method = bytesToBytes4(call);
        methodIdMockTypes[method] = MockType.Return;
        methodIdExpectations[method] = response;
        trackMethodIdMock(method);
    }
    function givenMethodReturn(bytes calldata call, bytes calldata response)
        external
        override
    {
        _givenMethodReturn(call, response);
    }
    function givenMethodReturnBool(bytes calldata call, bool response)
        external
        override
    {
        uint256 flag = response ? 1 : 0;
        _givenMethodReturn(call, uintToBytes(flag));
    }
    function givenMethodReturnUint(bytes calldata call, uint256 response)
        external
        override
    {
        _givenMethodReturn(call, uintToBytes(response));
    }
    function givenMethodReturnAddress(bytes calldata call, address response)
        external
        override
    {
        _givenMethodReturn(call, uintToBytes(uint256(response)));
    }
    function givenCalldataRevert(bytes calldata call) external override {
        calldataMockTypes[call] = MockType.Revert;
        calldataRevertMessage[call] = "";
        trackCalldataMock(call);
    }
    function givenMethodRevert(bytes calldata call) external override {
        bytes4 method = bytesToBytes4(call);
        methodIdMockTypes[method] = MockType.Revert;
        trackMethodIdMock(method);
    }
    function givenCalldataRevertWithMessage(
        bytes calldata call,
        string calldata message
    ) external override {
        calldataMockTypes[call] = MockType.Revert;
        calldataRevertMessage[call] = message;
        trackCalldataMock(call);
    }
    function givenMethodRevertWithMessage(
        bytes calldata call,
        string calldata message
    ) external override {
        bytes4 method = bytesToBytes4(call);
        methodIdMockTypes[method] = MockType.Revert;
        methodIdRevertMessages[method] = message;
        trackMethodIdMock(method);
    }
    function givenCalldataRunOutOfGas(bytes calldata call) external override {
        calldataMockTypes[call] = MockType.OutOfGas;
        trackCalldataMock(call);
    }
    function givenMethodRunOutOfGas(bytes calldata call) external override {
        bytes4 method = bytesToBytes4(call);
        methodIdMockTypes[method] = MockType.OutOfGas;
        trackMethodIdMock(method);
    }
    function invocationCount() external override returns (uint256) {
        return invocations;
    }
    function invocationCountForMethod(bytes calldata call)
        external
        override
        returns (uint256)
    {
        bytes4 method = bytesToBytes4(call);
        return
            methodIdInvocations[keccak256(
                abi.encodePacked(resetCount, method)
            )];
    }
    function invocationCountForCalldata(bytes calldata call)
        external
        override
        returns (uint256)
    {
        return
            calldataInvocations[keccak256(abi.encodePacked(resetCount, call))];
    }
    function reset() external override {
        // Reset all exact calldataMocks
        bytes memory nextMock = calldataMocks[MOCKS_LIST_START];
        bytes32 mockHash = keccak256(nextMock);
        // We cannot compary bytes
        while (mockHash != MOCKS_LIST_END_HASH) {
            // Reset all mock maps
            calldataMockTypes[nextMock] = MockType.Return;
            calldataExpectations[nextMock] = hex"";
            calldataRevertMessage[nextMock] = "";
            // Set next mock to remove
            nextMock = calldataMocks[mockHash];
            // Remove from linked list
            calldataMocks[mockHash] = "";
            // Update mock hash
            mockHash = keccak256(nextMock);
        }
        // Clear list
        calldataMocks[MOCKS_LIST_START] = MOCKS_LIST_END;
        // Reset all any calldataMocks
        bytes4 nextAnyMock = methodIdMocks[SENTINEL_ANY_MOCKS];
        while (nextAnyMock != SENTINEL_ANY_MOCKS) {
            bytes4 currentAnyMock = nextAnyMock;
            methodIdMockTypes[currentAnyMock] = MockType.Return;
            methodIdExpectations[currentAnyMock] = hex"";
            methodIdRevertMessages[currentAnyMock] = "";
            nextAnyMock = methodIdMocks[currentAnyMock];
            // Remove from linked list
            methodIdMocks[currentAnyMock] = 0x0;
        }
        // Clear list
        methodIdMocks[SENTINEL_ANY_MOCKS] = SENTINEL_ANY_MOCKS;
        fallbackExpectation = DEFAULT_FALLBACK_VALUE;
        fallbackMockType = MockType.Return;
        invocations = 0;
        resetCount += 1;
    }
    function useAllGas() private {
        while (true) {
            bool s;
            assembly {
                //expensive call to EC multiply contract
                s := call(sub(gas(), 2000), 6, 0, 0x0, 0xc0, 0x0, 0x60)
            }
        }
    }
    function bytesToBytes4(bytes memory b) private pure returns (bytes4) {
        bytes4 out;
        for (uint256 i = 0; i < 4; i++) {
            out |= bytes4(b[i] & 0xFF) >> (i * 8);
        }
        return out;
    }
    function uintToBytes(uint256 x) private pure returns (bytes memory b) {
        b = new bytes(32);
        assembly {
            mstore(add(b, 32), x)
        }
    }
    function updateInvocationCount(
        bytes4 methodId,
        bytes memory originalMsgData
    ) public {
        require(
            msg.sender == address(this),
            "Can only be called from the contract itself"
        );
        invocations += 1;
        methodIdInvocations[keccak256(
            abi.encodePacked(resetCount, methodId)
        )] += 1;
        calldataInvocations[keccak256(
            abi.encodePacked(resetCount, originalMsgData)
        )] += 1;
    }
    fallback() external payable {
        bytes4 methodId;
        assembly {
            methodId := calldataload(0)
        }
        // First, check exact matching overrides
        if (calldataMockTypes[msg.data] == MockType.Revert) {
            revert(calldataRevertMessage[msg.data]);
        }
        if (calldataMockTypes[msg.data] == MockType.OutOfGas) {
            useAllGas();
        }
        bytes memory result = calldataExpectations[msg.data];
        // Then check method Id overrides
        if (result.length == 0) {
            if (methodIdMockTypes[methodId] == MockType.Revert) {
                revert(methodIdRevertMessages[methodId]);
            }
            if (methodIdMockTypes[methodId] == MockType.OutOfGas) {
                useAllGas();
            }
            result = methodIdExpectations[methodId];
        }
        // Last, use the fallback override
        if (result.length == 0) {
            if (fallbackMockType == MockType.Revert) {
                revert(fallbackRevertMessage);
            }
            if (fallbackMockType == MockType.OutOfGas) {
                useAllGas();
            }
            result = fallbackExpectation;
        }
        // Record invocation as separate call so we don't rollback in case we are called with STATICCALL
        (, bytes memory r) = address(this).call{gas: 100000}(
            abi.encodeWithSignature(
                "updateInvocationCount(bytes4,bytes)",
                methodId,
                msg.data
            )
        );
        assert(r.length == 0);
        assembly {
            return(add(0x20, result), mload(result))
        }
    }
}
pragma solidity ^0.6.0;
contract MockSelfDestruct {
    constructor() public payable {}
    fallback() external payable {
        selfdestruct(msg.sender);
    }
    function kill(address payable target) external payable {
        selfdestruct(target);
    }
}

{"Constants.84ef19f8.sol":{"content":"// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\nlibrary Constants {\r\n    address internal constant ETH = 0x0000000000000000000000000000000000000000;\r\n}\r\n"},"Spender.3372a096.sol":{"content":"// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\nimport \"./Constants.84ef19f8.sol\";\r\n\r\ncontract Spender {\r\n    address public immutable metaswap;\r\n\r\n    constructor() public {\r\n        metaswap = msg.sender;\r\n    }\r\n\r\n    /// @dev Receives ether from swaps\r\n    fallback() external payable {}\r\n\r\n    function swap(address adapter, bytes calldata data) external payable {\r\n        require(msg.sender == metaswap, \"FORBIDDEN\");\r\n        require(adapter != address(0), \"ADAPTER_NOT_PROVIDED\");\r\n        _delegate(adapter, data, \"ADAPTER_DELEGATECALL_FAILED\");\r\n    }\r\n\r\n    /**\r\n     * @dev Performs a delegatecall and bubbles up the errors, adapted from\r\n     * https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/Address.sol\r\n     * @param target Address of the contract to delegatecall\r\n     * @param data Data passed in the delegatecall\r\n     * @param errorMessage Fallback revert reason\r\n     */\r\n    function _delegate(\r\n        address target,\r\n        bytes memory data,\r\n        string memory errorMessage\r\n    ) private returns (bytes memory) {\r\n        // solhint-disable-next-line avoid-low-level-calls\r\n        (bool success, bytes memory returndata) = target.delegatecall(data);\r\n        if (success) {\r\n            return returndata;\r\n        } else {\r\n            // Look for revert reason and bubble it up if present\r\n            if (returndata.length \u003e 0) {\r\n                // The easiest way to bubble the revert reason is using memory via assembly\r\n\r\n                // solhint-disable-next-line no-inline-assembly\r\n                assembly {\r\n                    let returndata_size := mload(returndata)\r\n                    revert(add(32, returndata), returndata_size)\r\n                }\r\n            } else {\r\n                revert(errorMessage);\r\n            }\r\n        }\r\n    }\r\n}\r\n"}}

// SPDX-License-Identifier: Apache-2.0
pragma solidity 0.6.2;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.0.0, only sets of type `address` (`AddressSet`) and `uint256`
 * (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;

        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) { // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            bytes32 lastvalue = set._values[lastIndex];

            // Move the last value to the index where the value to delete is
            set._values[toDeleteIndex] = lastvalue;
            // Update the index for the moved value
            set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        require(set._values.length > index, "EnumerableSet: index out of bounds");
        return set._values[index];
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint256(_at(set._inner, index)));
    }


    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
}

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
}

/*
 * @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 GSN 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.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () internal { }

    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, _msgSender()));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 */
abstract contract AccessControl is Context {
    using EnumerableSet for EnumerableSet.AddressSet;
    using Address for address;

    struct RoleData {
        EnumerableSet.AddressSet members;
        bytes32 adminRole;
    }

    mapping (bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view returns (bool) {
        return _roles[role].members.contains(account);
    }

    /**
     * @dev Returns the number of accounts that have `role`. Can be used
     * together with {getRoleMember} to enumerate all bearers of a role.
     */
    function getRoleMemberCount(bytes32 role) public view returns (uint256) {
        return _roles[role].members.length();
    }

    /**
     * @dev Returns one of the accounts that have `role`. `index` must be a
     * value between 0 and {getRoleMemberCount}, non-inclusive.
     *
     * Role bearers are not sorted in any particular way, and their ordering may
     * change at any point.
     *
     * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
     * you perform all queries on the same block. See the following
     * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
     * for more information.
     */
    function getRoleMember(bytes32 role, uint256 index) public view returns (address) {
        return _roles[role].members.at(index);
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) public virtual {
        require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to grant");

        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) public virtual {
        require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to revoke");

        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) public virtual {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        _roles[role].adminRole = adminRole;
    }

    function _grantRole(bytes32 role, address account) private {
        if (_roles[role].members.add(account)) {
            emit RoleGranted(role, account, _msgSender());
        }
    }

    function _revokeRole(bytes32 role, address account) private {
        if (_roles[role].members.remove(account)) {
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}



/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @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 Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

/**
 * @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 {ERC20MinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of 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, IERC20 {
    using SafeMath for uint256;
    using Address for address;

    mapping (address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol) public {
        _name = name;
        _symbol = symbol;
        _decimals = 18;
    }

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

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view 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 value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * 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 returns (uint8) {
        return _decimals;
    }

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

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

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, 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}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), 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};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        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) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(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) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is 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:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, 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.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(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");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
     *
     * This is 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 Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}


/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor () internal {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     */
    modifier whenNotPaused() {
        require(!_paused, "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     */
    modifier whenPaused() {
        require(_paused, "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

/**
 * @dev ERC20 token with pausable token transfers, minting and burning.
 *
 * Useful for scenarios such as preventing trades until the end of an evaluation
 * period, or having an emergency switch for freezing all token transfers in the
 * event of a large bug.
 */
abstract contract ERC20Pausable is ERC20, Pausable {
    /**
     * @dev See {ERC20-_beforeTokenTransfer}.
     *
     * Requirements:
     *
     * - the contract must not be paused.
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual override {
        super._beforeTokenTransfer(from, to, amount);

        require(!paused(), "ERC20Pausable: token transfer while paused");
    }
}


/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) external {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) external {
        uint256 decreasedAllowance = allowance(account, _msgSender()).sub(amount, "ERC20: burn amount exceeds allowance");

        _approve(account, _msgSender(), decreasedAllowance);
        _burn(account, amount);
    }
}

/**
 * @dev {ERC20} token, including:
 *
 *  - ability for holders to burn (destroy) their tokens
 *  - a minter role that allows for token minting (creation)
 *  - a pauser role that allows to stop all token transfers
 *
 * This contract uses {AccessControl} to lock permissioned functions using the
 * different roles - head to its documentation for details.
 *
 * The account that deploys the contract will be granted the minter and pauser
 * roles, as well as the default admin role, which will let it grant both minter
 * and pauser roles to other accounts.
 */
contract FetchToken is Context, AccessControl, ERC20Burnable, ERC20Pausable {
    bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
    bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");

    /**
     * @dev Grants `DEFAULT_ADMIN_ROLE`, `MINTER_ROLE` and `PAUSER_ROLE` to the
     * account that deploys the contract.
     *
     * See {ERC20-constructor}.
     */


    modifier onlyMinter {
        require(hasRole(MINTER_ROLE, _msgSender()), "signer must have minter role to mint");
        _; 
        }

    modifier onlyPauser {
        require(hasRole(PAUSER_ROLE, _msgSender()), "signer must have pauser role to pause/unpause");
        _; 
        }


    constructor(string memory name, 
                string memory symbol, 
                uint256 _initialSupply) public ERC20(name, symbol) {
        _setupRole(DEFAULT_ADMIN_ROLE, _msgSender());

        _setupRole(MINTER_ROLE, _msgSender());
        _setupRole(PAUSER_ROLE, _msgSender());
        _mint(_msgSender(), _initialSupply); 
    }

    /**
     * @dev Creates `amount` new tokens for `to`.
     *
     * See {ERC20-_mint}.
     *
     * Requirements:
     *
     * - the caller must have the `MINTER_ROLE`.
     */
    function mint(address to, uint256 amount) onlyMinter external {
        _mint(to, amount);
    }

    /**
     * @dev Pauses all token transfers.
     *
     * See {ERC20Pausable} and {Pausable-_pause}.
     *
     * Requirements:
     *
     * - the caller must have the `PAUSER_ROLE`.
     */
    function pause() onlyPauser external {
        _pause();
    }

    /**
     * @dev Unpauses all token transfers.
     *
     * See {ERC20Pausable} and {Pausable-_unpause}.
     *
     * Requirements:
     *
     * - the caller must have the `PAUSER_ROLE`.
     */
    function unpause() onlyPauser external {
        _unpause();
    }

    function _beforeTokenTransfer(address from, address to, uint256 amount) internal override(ERC20, ERC20Pausable) {
        super._beforeTokenTransfer(from, to, amount);
    }
}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity 0.8.3;
/*
 * @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) {
    this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
    return msg.data;
  }
}
/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
  /**
   * @dev Returns true if this contract implements the interface defined by
   * `interfaceId`. See the corresponding
   * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
   * to learn more about how these ids are created.
   *
   * This function call must use less than 30 000 gas.
   */
  function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
  /**
   * @dev See {IERC165-supportsInterface}.
   */
  function supportsInterface(bytes4 interfaceId)
    public
    view
    virtual
    override
    returns (bool)
  {
    return interfaceId == type(IERC165).interfaceId;
  }
}
/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
  function hasRole(bytes32 role, address account) external view returns (bool);
  function getRoleAdmin(bytes32 role) external view returns (bytes32);
  function grantRole(bytes32 role, address account) external;
  function revokeRole(bytes32 role, address account) external;
  function renounceRole(bytes32 role, address account) external;
}
/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
  struct RoleData {
    mapping(address => bool) members;
    bytes32 adminRole;
  }
  mapping(bytes32 => RoleData) private _roles;
  bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;
  /**
   * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
   *
   * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
   * {RoleAdminChanged} not being emitted signaling this.
   *
   * _Available since v3.1._
   */
  event RoleAdminChanged(
    bytes32 indexed role,
    bytes32 indexed previousAdminRole,
    bytes32 indexed newAdminRole
  );
  /**
   * @dev Emitted when `account` is granted `role`.
   *
   * `sender` is the account that originated the contract call, an admin role
   * bearer except when using {_setupRole}.
   */
  event RoleGranted(
    bytes32 indexed role,
    address indexed account,
    address indexed sender
  );
  /**
   * @dev Emitted when `account` is revoked `role`.
   *
   * `sender` is the account that originated the contract call:
   *   - if using `revokeRole`, it is the admin role bearer
   *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
   */
  event RoleRevoked(
    bytes32 indexed role,
    address indexed account,
    address indexed sender
  );
  /**
   * @dev See {IERC165-supportsInterface}.
   */
  function supportsInterface(bytes4 interfaceId)
    public
    view
    virtual
    override
    returns (bool)
  {
    return
      interfaceId == type(IAccessControl).interfaceId ||
      super.supportsInterface(interfaceId);
  }
  /**
   * @dev Returns `true` if `account` has been granted `role`.
   */
  function hasRole(bytes32 role, address account)
    public
    view
    override
    returns (bool)
  {
    return _roles[role].members[account];
  }
  /**
   * @dev Returns the admin role that controls `role`. See {grantRole} and
   * {revokeRole}.
   *
   * To change a role's admin, use {_setRoleAdmin}.
   */
  function getRoleAdmin(bytes32 role) public view override returns (bytes32) {
    return _roles[role].adminRole;
  }
  /**
   * @dev Grants `role` to `account`.
   *
   * If `account` had not been already granted `role`, emits a {RoleGranted}
   * event.
   *
   * Requirements:
   *
   * - the caller must have ``role``'s admin role.
   */
  function grantRole(bytes32 role, address account) public virtual override {
    require(
      hasRole(getRoleAdmin(role), _msgSender()),
      "AccessControl: sender must be an admin to grant"
    );
    _grantRole(role, account);
  }
  /**
   * @dev Revokes `role` from `account`.
   *
   * If `account` had been granted `role`, emits a {RoleRevoked} event.
   *
   * Requirements:
   *
   * - the caller must have ``role``'s admin role.
   */
  function revokeRole(bytes32 role, address account) public virtual override {
    require(
      hasRole(getRoleAdmin(role), _msgSender()),
      "AccessControl: sender must be an admin to revoke"
    );
    _revokeRole(role, account);
  }
  /**
   * @dev Revokes `role` from the calling account.
   *
   * Roles are often managed via {grantRole} and {revokeRole}: this function's
   * purpose is to provide a mechanism for accounts to lose their privileges
   * if they are compromised (such as when a trusted device is misplaced).
   *
   * If the calling account had been granted `role`, emits a {RoleRevoked}
   * event.
   *
   * Requirements:
   *
   * - the caller must be `account`.
   */
  function renounceRole(bytes32 role, address account) public virtual override {
    require(
      account == _msgSender(),
      "AccessControl: can only renounce roles for self"
    );
    _revokeRole(role, account);
  }
  /**
   * @dev Grants `role` to `account`.
   *
   * If `account` had not been already granted `role`, emits a {RoleGranted}
   * event. Note that unlike {grantRole}, this function doesn't perform any
   * checks on the calling account.
   *
   * [WARNING]
   * ====
   * This function should only be called from the constructor when setting
   * up the initial roles for the system.
   *
   * Using this function in any other way is effectively circumventing the admin
   * system imposed by {AccessControl}.
   * ====
   */
  function _setupRole(bytes32 role, address account) internal virtual {
    _grantRole(role, account);
  }
  /**
   * @dev Sets `adminRole` as ``role``'s admin role.
   *
   * Emits a {RoleAdminChanged} event.
   */
  function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
    emit RoleAdminChanged(role, getRoleAdmin(role), adminRole);
    _roles[role].adminRole = adminRole;
  }
  function _grantRole(bytes32 role, address account) private {
    if (!hasRole(role, account)) {
      _roles[role].members[account] = true;
      emit RoleGranted(role, account, _msgSender());
    }
  }
  function _revokeRole(bytes32 role, address account) private {
    if (hasRole(role, account)) {
      _roles[role].members[account] = false;
      emit RoleRevoked(role, account, _msgSender());
    }
  }
}
interface IOndo {
  enum InvestorType {CoinlistTranche1, CoinlistTranche2, SeedTranche}
  // ----------- State changing api -----------
  /// @notice Called by timelock contract to initialize locked balance of coinlist/seed investor
  function updateTrancheBalance(
    address beneficiary,
    uint256 rawAmount,
    InvestorType tranche
  ) external;
  // ----------- Getters -----------
  /// @notice Gets the TOTAL amount of Ondo available for an address
  function getFreedBalance(address account) external view returns (uint96);
  /// @notice Gets the initial locked balance and unlocked Ondo for an address
  function getVestedBalance(address account)
    external
    view
    returns (uint96, uint96);
}
abstract contract LinearTimelock {
  struct InvestorParam {
    IOndo.InvestorType investorType;
    uint96 initialBalance;
  }
  /// @notice the timestamp at which releasing is allowed
  uint256 public cliffTimestamp;
  /// @notice the linear vesting period for the first tranche
  uint256 public immutable tranche1VestingPeriod;
  /// @notice the linear vesting period for the second tranche
  uint256 public immutable tranche2VestingPeriod;
  /// @notice the linear vesting period for the Seed/Series A Tranche
  uint256 public immutable seedVestingPeriod;
  /// @dev mapping of balances for each investor
  mapping(address => InvestorParam) internal investorBalances;
  /// @notice role that allows updating of tranche balances - granted to Merkle airdrop contract
  bytes32 public constant TIMELOCK_UPDATE_ROLE =
    keccak256("TIMELOCK_UPDATE_ROLE");
  constructor(
    uint256 _cliffTimestamp,
    uint256 _tranche1VestingPeriod,
    uint256 _tranche2VestingPeriod,
    uint256 _seedVestingPeriod
  ) {
    cliffTimestamp = _cliffTimestamp;
    tranche1VestingPeriod = _tranche1VestingPeriod;
    tranche2VestingPeriod = _tranche2VestingPeriod;
    seedVestingPeriod = _seedVestingPeriod;
  }
  function passedCliff() public view returns (bool) {
    return block.timestamp > cliffTimestamp;
  }
  /// @dev the seedVestingPeriod is the longest vesting period
  function passedAllVestingPeriods() public view returns (bool) {
    return block.timestamp > cliffTimestamp + seedVestingPeriod;
  }
  /**
    @notice View function to get the user's initial balance and current amount of freed balance
   */
  function getVestedBalance(address account)
    external
    view
    returns (uint256, uint256)
  {
    if (investorBalances[account].initialBalance == 0) {
      return (0, 0);
    }
    InvestorParam memory investorParam = investorBalances[account];
    uint96 amountAvailable;
    if (passedAllVestingPeriods()) {
      amountAvailable = investorParam.initialBalance;
    } else if (passedCliff()) {
      (uint256 vestingPeriod, uint256 elapsed) =
        _getTrancheInfo(investorParam.investorType);
      amountAvailable = _proportionAvailable(
        elapsed,
        vestingPeriod,
        investorParam
      );
    } else {
      amountAvailable = 0;
    }
    return (investorParam.initialBalance, amountAvailable);
  }
  function _getTrancheInfo(IOndo.InvestorType investorType)
    internal
    view
    returns (uint256 vestingPeriod, uint256 elapsed)
  {
    elapsed = block.timestamp - cliffTimestamp;
    if (investorType == IOndo.InvestorType.CoinlistTranche1) {
      elapsed = elapsed > tranche1VestingPeriod
        ? tranche1VestingPeriod
        : elapsed;
      vestingPeriod = tranche1VestingPeriod;
    } else if (investorType == IOndo.InvestorType.CoinlistTranche2) {
      elapsed = elapsed > tranche2VestingPeriod
        ? tranche2VestingPeriod
        : elapsed;
      vestingPeriod = tranche2VestingPeriod;
    } else if (investorType == IOndo.InvestorType.SeedTranche) {
      elapsed = elapsed > seedVestingPeriod ? seedVestingPeriod : elapsed;
      vestingPeriod = seedVestingPeriod;
    }
  }
  function _proportionAvailable(
    uint256 elapsed,
    uint256 vestingPeriod,
    InvestorParam memory investorParam
  ) internal pure returns (uint96) {
    if (investorParam.investorType == IOndo.InvestorType.SeedTranche) {
      // Seed/Series A Tranche Balance = proportionAvail*2/3 + x/3, where x = Balance. This allows 1/3 of the series A balance to be unlocked at cliff
      uint96 vestedAmount =
        safe96(
          (((investorParam.initialBalance * elapsed) / vestingPeriod) * 2) / 3,
          "Ondo::_proportionAvailable: amount exceeds 96 bits"
        );
      return
        add96(
          vestedAmount,
          investorParam.initialBalance / 3,
          "Ondo::_proportionAvailable: overflow"
        );
    } else {
      return
        safe96(
          (investorParam.initialBalance * elapsed) / vestingPeriod,
          "Ondo::_proportionAvailable: amount exceeds 96 bits"
        );
    }
  }
  function safe32(uint256 n, string memory errorMessage)
    internal
    pure
    returns (uint32)
  {
    require(n < 2**32, errorMessage);
    return uint32(n);
  }
  function safe96(uint256 n, string memory errorMessage)
    internal
    pure
    returns (uint96)
  {
    require(n < 2**96, errorMessage);
    return uint96(n);
  }
  function add96(
    uint96 a,
    uint96 b,
    string memory errorMessage
  ) internal pure returns (uint96) {
    uint96 c = a + b;
    require(c >= a, errorMessage);
    return c;
  }
  function sub96(
    uint96 a,
    uint96 b,
    string memory errorMessage
  ) internal pure returns (uint96) {
    require(b <= a, errorMessage);
    return a - b;
  }
}
contract Ondo is AccessControl, LinearTimelock {
  /// @notice EIP-20 token name for this token
  string public constant name = "Ondo";
  /// @notice EIP-20 token symbol for this token
  string public constant symbol = "ONDO";
  /// @notice EIP-20 token decimals for this token
  uint8 public constant decimals = 18;
  // whether token transfers are allowed
  bool public transferAllowed; // false by default
  /// @notice Total number of tokens in circulation
  uint256 public totalSupply = 10_000_000_000e18; // 10 billion Ondo
  // Allowance amounts on behalf of others
  mapping(address => mapping(address => uint96)) internal allowances;
  // Official record of token balances for each account
  mapping(address => uint96) internal balances;
  /// @notice A record of each accounts delegate
  mapping(address => address) public delegates;
  /// @notice A checkpoint for marking number of votes from a given block
  struct Checkpoint {
    uint32 fromBlock;
    uint96 votes;
  }
  /// @notice A record of votes checkpoints for each account, by index
  mapping(address => mapping(uint32 => Checkpoint)) public checkpoints;
  /// @notice The number of checkpoints for each account
  mapping(address => uint32) public numCheckpoints;
  /// @notice The EIP-712 typehash for the contract's domain
  bytes32 public constant DOMAIN_TYPEHASH =
    keccak256(
      "EIP712Domain(string name,uint256 chainId,address verifyingContract)"
    );
  /// @notice The EIP-712 typehash for the delegation struct used by the contract
  bytes32 public constant DELEGATION_TYPEHASH =
    keccak256("Delegation(address delegatee,uint256 nonce,uint256 expiry)");
  /// @notice The identifier of the role which allows special transfer privileges.
  bytes32 public constant TRANSFER_ROLE = keccak256("TRANSFER_ROLE");
  bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
  /// @notice A record of states for signing / validating signatures
  mapping(address => uint256) public nonces;
  /// @notice An event thats emitted when an account changes its delegate
  event DelegateChanged(
    address indexed delegator,
    address indexed fromDelegate,
    address indexed toDelegate
  );
  /// @notice An event thats emitted when a delegate account's vote balance changes
  event DelegateVotesChanged(
    address indexed delegate,
    uint256 previousBalance,
    uint256 newBalance
  );
  /// @notice The standard EIP-20 transfer event
  event Transfer(address indexed from, address indexed to, uint256 amount);
  /// @notice The standard EIP-20 approval event
  event Approval(
    address indexed owner,
    address indexed spender,
    uint256 amount
  );
  event CliffTimestampUpdate(uint256 newTimestamp);
  /**
   * @dev Emitted when the transfer is enabled triggered by `account`.
   */
  event TransferEnabled(address account);
  /// @notice a modifier which checks if transfers are allowed
  modifier whenTransferAllowed() {
    require(
      transferAllowed || hasRole(TRANSFER_ROLE, msg.sender),
      "OndoToken: Transfers not allowed or not right privillege"
    );
    _;
  }
  /**
   * @notice Construct a new Ondo token
   * @param _governance The initial account to grant owner permission and all the tokens
   */
  constructor(
    address _governance,
    uint256 _cliffTimestamp,
    uint256 _tranche1VestingPeriod,
    uint256 _tranche2VestingPeriod,
    uint256 _seedVestingPeriod
  )
    LinearTimelock(
      _cliffTimestamp,
      _tranche1VestingPeriod,
      _tranche2VestingPeriod,
      _seedVestingPeriod
    )
  {
    balances[_governance] = uint96(totalSupply);
    _setupRole(DEFAULT_ADMIN_ROLE, _governance);
    _setupRole(TRANSFER_ROLE, _governance);
    _setupRole(MINTER_ROLE, _governance);
    emit Transfer(address(0), _governance, totalSupply);
  }
  /**
   * @notice Get the number of tokens `spender` is approved to spend on behalf of `account`
   * @param account The address of the account holding the funds
   * @param spender The address of the account spending the funds
   * @return The number of tokens approved
   */
  function allowance(address account, address spender)
    external
    view
    returns (uint256)
  {
    return allowances[account][spender];
  }
  /**
   * @notice Approve `spender` to transfer up to `amount` from `src`
   * @dev This will overwrite the approval amount for `spender`
   *  and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve)
   * @param spender The address of the account which may transfer tokens
   * @param rawAmount The number of tokens that are approved (2^256-1 means infinite)
   * @return Whether or not the approval succeeded
   */
  function approve(address spender, uint256 rawAmount) external returns (bool) {
    uint96 amount;
    if (rawAmount == type(uint256).max) {
      amount = type(uint96).max;
    } else {
      amount = safe96(rawAmount, "Ondo::approve: amount exceeds 96 bits");
    }
    allowances[msg.sender][spender] = amount;
    emit Approval(msg.sender, spender, amount);
    return true;
  }
  /**
   * @notice Get the number of tokens held by the `account`
   * @param account The address of the account to get the balance of
   * @return The number of tokens held
   */
  function balanceOf(address account) external view returns (uint256) {
    return balances[account];
  }
  /**
   * @notice Get the total number of UNLOCKED tokens held by the `account`
   * @param account The address of the account to get the unlocked balance of
   * @return The number of unlocked tokens held.
   */
  function getFreedBalance(address account) external view returns (uint256) {
    if (investorBalances[account].initialBalance > 0) {
      return _getFreedBalance(account);
    } else {
      return balances[account];
    }
  }
  /**
   * @notice Transfer `amount` tokens from `msg.sender` to `dst`
   * @param dst The address of the destination account
   * @param rawAmount The number of tokens to transfer
   * @return Whether or not the transfer succeeded
   */
  function transfer(address dst, uint256 rawAmount) external returns (bool) {
    uint96 amount = safe96(rawAmount, "Ondo::transfer: amount exceeds 96 bits");
    _transferTokens(msg.sender, dst, amount);
    return true;
  }
  /**
   * @notice Transfer `amount` tokens from `src` to `dst`
   * @param src The address of the source account
   * @param dst The address of the destination account
   * @param rawAmount The number of tokens to transfer
   * @return Whether or not the transfer succeeded
   */
  function transferFrom(
    address src,
    address dst,
    uint256 rawAmount
  ) external returns (bool) {
    address spender = msg.sender;
    uint96 spenderAllowance = allowances[src][spender];
    uint96 amount = safe96(rawAmount, "Ondo::approve: amount exceeds 96 bits");
    if (spender != src && spenderAllowance != type(uint96).max) {
      uint96 newAllowance =
        sub96(
          spenderAllowance,
          amount,
          "Ondo::transferFrom: transfer amount exceeds spender allowance"
        );
      allowances[src][spender] = newAllowance;
      emit Approval(src, spender, newAllowance);
    }
    _transferTokens(src, dst, amount);
    return true;
  }
  /**
   * @notice Delegate votes from `msg.sender` to `delegatee`
   * @param delegatee The address to delegate votes to
   */
  function delegate(address delegatee) public {
    return _delegate(msg.sender, delegatee);
  }
  /**
   * @notice Delegates votes from signatory to `delegatee`
   * @param delegatee The address to delegate votes to
   * @param nonce The contract state required to match the signature
   * @param expiry The time at which to expire the signature
   * @param v The recovery byte of the signature
   * @param r Half of the ECDSA signature pair
   * @param s Half of the ECDSA signature pair
   */
  function delegateBySig(
    address delegatee,
    uint256 nonce,
    uint256 expiry,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) public {
    bytes32 domainSeparator =
      keccak256(
        abi.encode(
          DOMAIN_TYPEHASH,
          keccak256(bytes(name)),
          getChainId(),
          address(this)
        )
      );
    bytes32 structHash =
      keccak256(abi.encode(DELEGATION_TYPEHASH, delegatee, nonce, expiry));
    bytes32 digest =
      keccak256(abi.encodePacked("\\x19\\x01", domainSeparator, structHash));
    address signatory = ecrecover(digest, v, r, s);
    require(signatory != address(0), "Ondo::delegateBySig: invalid signature");
    require(nonce == nonces[signatory]++, "Ondo::delegateBySig: invalid nonce");
    require(
      block.timestamp <= expiry,
      "Ondo::delegateBySig: signature expired"
    );
    return _delegate(signatory, delegatee);
  }
  /**
   * @notice Gets the current votes balance for `account`
   * @param account The address to get votes balance
   * @return The number of current votes for `account`
   */
  function getCurrentVotes(address account) external view returns (uint96) {
    uint32 nCheckpoints = numCheckpoints[account];
    return nCheckpoints > 0 ? checkpoints[account][nCheckpoints - 1].votes : 0;
  }
  /**
   * @notice Determine the prior number of votes for an account as of a block number
   * @dev Block number must be a finalized block or else this function will revert to prevent misinformation.
   * @param account The address of the account to check
   * @param blockNumber The block number to get the vote balance at
   * @return The number of votes the account had as of the given block
   */
  function getPriorVotes(address account, uint256 blockNumber)
    public
    view
    returns (uint96)
  {
    require(
      blockNumber < block.number,
      "Ondo::getPriorVotes: not yet determined"
    );
    uint32 nCheckpoints = numCheckpoints[account];
    if (nCheckpoints == 0) {
      return 0;
    }
    // First check most recent balance
    if (checkpoints[account][nCheckpoints - 1].fromBlock <= blockNumber) {
      return checkpoints[account][nCheckpoints - 1].votes;
    }
    // Next check implicit zero balance
    if (checkpoints[account][0].fromBlock > blockNumber) {
      return 0;
    }
    uint32 lower = 0;
    uint32 upper = nCheckpoints - 1;
    while (upper > lower) {
      uint32 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
      Checkpoint memory cp = checkpoints[account][center];
      if (cp.fromBlock == blockNumber) {
        return cp.votes;
      } else if (cp.fromBlock < blockNumber) {
        lower = center;
      } else {
        upper = center - 1;
      }
    }
    return checkpoints[account][lower].votes;
  }
  /**
   * @notice Create `rawAmount` new tokens and assign them to `account`.
   * @param account The address to give newly minted tokens to
   * @param rawAmount Number of new tokens to mint.
   * @dev Even though total token supply is uint96, we use uint256 for the amount for consistency with other external interfaces.
   */
  function mint(address account, uint256 rawAmount) external {
    require(hasRole(MINTER_ROLE, msg.sender), "Ondo::mint: not authorized");
    require(account != address(0), "cannot mint to the zero address");
    uint96 amount = safe96(rawAmount, "Ondo::mint: amount exceeds 96 bits");
    uint96 supply =
      safe96(totalSupply, "Ondo::mint: totalSupply exceeds 96 bits");
    totalSupply = add96(supply, amount, "Ondo::mint: token supply overflow");
    balances[account] = add96(
      balances[account],
      amount,
      "Ondo::mint: balance overflow"
    );
    emit Transfer(address(0), account, amount);
  }
  function _delegate(address delegator, address delegatee) internal {
    address currentDelegate = delegates[delegator];
    uint96 delegatorBalance = balances[delegator];
    delegates[delegator] = delegatee;
    emit DelegateChanged(delegator, currentDelegate, delegatee);
    _moveDelegates(currentDelegate, delegatee, delegatorBalance);
  }
  function _transferTokens(
    address src,
    address dst,
    uint96 amount
  ) internal whenTransferAllowed {
    require(
      src != address(0),
      "Ondo::_transferTokens: cannot transfer from the zero address"
    );
    require(
      dst != address(0),
      "Ondo::_transferTokens: cannot transfer to the zero address"
    );
    if (investorBalances[src].initialBalance > 0) {
      require(
        amount <= _getFreedBalance(src),
        "Ondo::_transferTokens: not enough unlocked balance"
      );
    }
    balances[src] = sub96(
      balances[src],
      amount,
      "Ondo::_transferTokens: transfer amount exceeds balance"
    );
    balances[dst] = add96(
      balances[dst],
      amount,
      "Ondo::_transferTokens: transfer amount overflows"
    );
    emit Transfer(src, dst, amount);
    _moveDelegates(delegates[src], delegates[dst], amount);
  }
  function _moveDelegates(
    address srcRep,
    address dstRep,
    uint96 amount
  ) internal {
    if (srcRep != dstRep && amount > 0) {
      if (srcRep != address(0)) {
        uint32 srcRepNum = numCheckpoints[srcRep];
        uint96 srcRepOld =
          srcRepNum > 0 ? checkpoints[srcRep][srcRepNum - 1].votes : 0;
        uint96 srcRepNew =
          sub96(srcRepOld, amount, "Ondo::_moveVotes: vote amount underflows");
        _writeCheckpoint(srcRep, srcRepNum, srcRepOld, srcRepNew);
      }
      if (dstRep != address(0)) {
        uint32 dstRepNum = numCheckpoints[dstRep];
        uint96 dstRepOld =
          dstRepNum > 0 ? checkpoints[dstRep][dstRepNum - 1].votes : 0;
        uint96 dstRepNew =
          add96(dstRepOld, amount, "Ondo::_moveVotes: vote amount overflows");
        _writeCheckpoint(dstRep, dstRepNum, dstRepOld, dstRepNew);
      }
    }
  }
  function _writeCheckpoint(
    address delegatee,
    uint32 nCheckpoints,
    uint96 oldVotes,
    uint96 newVotes
  ) internal {
    uint32 blockNumber =
      safe32(
        block.number,
        "Ondo::_writeCheckpoint: block number exceeds 32 bits"
      );
    if (
      nCheckpoints > 0 &&
      checkpoints[delegatee][nCheckpoints - 1].fromBlock == blockNumber
    ) {
      checkpoints[delegatee][nCheckpoints - 1].votes = newVotes;
    } else {
      checkpoints[delegatee][nCheckpoints] = Checkpoint(blockNumber, newVotes);
      numCheckpoints[delegatee] = nCheckpoints + 1;
    }
    emit DelegateVotesChanged(delegatee, oldVotes, newVotes);
  }
  function getChainId() internal view returns (uint256) {
    uint256 chainId;
    assembly {
      chainId := chainid()
    }
    return chainId;
  }
  /**
   * @notice Turn on _transferAllowed variable. Transfers are enabled
   */
  function enableTransfer() external {
    require(
      hasRole(DEFAULT_ADMIN_ROLE, msg.sender),
      "Ondo::enableTransfer: not authorized"
    );
    transferAllowed = true;
    emit TransferEnabled(msg.sender);
  }
  /**
   * @notice Called by merkle airdrop contract to initialize locked balances
   */
  function updateTrancheBalance(
    address beneficiary,
    uint256 rawAmount,
    IOndo.InvestorType investorType
  ) external {
    require(hasRole(TIMELOCK_UPDATE_ROLE, msg.sender));
    require(rawAmount > 0, "Ondo::updateTrancheBalance: amount must be > 0");
    require(
      investorBalances[beneficiary].initialBalance == 0,
      "Ondo::updateTrancheBalance: already has timelocked Ondo"
    ); //Prevents users from being in more than 1 tranche
    uint96 amount =
      safe96(rawAmount, "Ondo::updateTrancheBalance: amount exceeds 96 bits");
    investorBalances[beneficiary] = InvestorParam(investorType, amount);
  }
  /**
   * @notice Internal function the amount of unlocked Ondo for an account that participated in Coinlist/Seed Investments
   */
  function _getFreedBalance(address account) internal view returns (uint96) {
    if (passedAllVestingPeriods()) {
      //all vesting periods are over, just return the total balance
      return balances[account];
    } else {
      InvestorParam memory investorParam = investorBalances[account];
      if (passedCliff()) {
        //we are in between the cliff timestamp and last vesting period
        (uint256 vestingPeriod, uint256 elapsed) =
          _getTrancheInfo(investorParam.investorType);
        uint96 lockedBalance =
          sub96(
            investorParam.initialBalance,
            _proportionAvailable(elapsed, vestingPeriod, investorParam),
            "Ondo::getFreedBalance: locked balance underflow"
          );
        return
          sub96(
            balances[account],
            lockedBalance,
            "Ondo::getFreedBalance: total freed balance underflow"
          );
      } else {
        //we have not hit the cliff yet, all investor balance is locked
        return
          sub96(
            balances[account],
            investorParam.initialBalance,
            "Ondo::getFreedBalance: balance underflow"
          );
      }
    }
  }
  function updateCliffTimestamp(uint256 newTimestamp) external {
    require(
      hasRole(DEFAULT_ADMIN_ROLE, msg.sender),
      "Ondo::updateCliffTimestamp: not authorized"
    );
    cliffTimestamp = newTimestamp;
    emit CliffTimestampUpdate(newTimestamp);
  }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.4;
import {ISplitMain} from './interfaces/ISplitMain.sol';
import {ERC20} from '@rari-capital/solmate/src/tokens/ERC20.sol';
import {SafeTransferLib} from '@rari-capital/solmate/src/utils/SafeTransferLib.sol';
/**
 * ERRORS
 */
/// @notice Unauthorized sender
error Unauthorized();
/**
 * @title SplitWallet
 * @author 0xSplits <[email protected]>
 * @notice The implementation logic for `SplitProxy`.
 * @dev `SplitProxy` handles `receive()` itself to avoid the gas cost with `DELEGATECALL`.
 */
contract SplitWallet {
  using SafeTransferLib for address;
  using SafeTransferLib for ERC20;
  /**
   * EVENTS
   */
  /** @notice emitted after each successful ETH transfer to proxy
   *  @param split Address of the split that received ETH
   *  @param amount Amount of ETH received
   */
  event ReceiveETH(address indexed split, uint256 amount);
  /**
   * STORAGE
   */
  /**
   * STORAGE - CONSTANTS & IMMUTABLES
   */
  /// @notice address of SplitMain for split distributions & EOA/SC withdrawals
  ISplitMain public immutable splitMain;
  /**
   * MODIFIERS
   */
  /// @notice Reverts if the sender isn't SplitMain
  modifier onlySplitMain() {
    if (msg.sender != address(splitMain)) revert Unauthorized();
    _;
  }
  /**
   * CONSTRUCTOR
   */
  constructor() {
    splitMain = ISplitMain(msg.sender);
  }
  /**
   * FUNCTIONS - PUBLIC & EXTERNAL
   */
  /** @notice Sends amount `amount` of ETH in proxy to SplitMain
   *  @dev payable reduces gas cost; no vulnerability to accidentally lock
   *  ETH introduced since fn call is restricted to SplitMain
   *  @param amount Amount to send
   */
  function sendETHToMain(uint256 amount) external payable onlySplitMain() {
    address(splitMain).safeTransferETH(amount);
  }
  /** @notice Sends amount `amount` of ERC20 `token` in proxy to SplitMain
   *  @dev payable reduces gas cost; no vulnerability to accidentally lock
   *  ETH introduced since fn call is restricted to SplitMain
   *  @param token Token to send
   *  @param amount Amount to send
   */
  function sendERC20ToMain(ERC20 token, uint256 amount)
    external
    payable
    onlySplitMain()
  {
    token.safeTransfer(address(splitMain), amount);
  }
}
// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.4;
import {ERC20} from '@rari-capital/solmate/src/tokens/ERC20.sol';
/**
 * @title ISplitMain
 * @author 0xSplits <[email protected]>
 */
interface ISplitMain {
  /**
   * FUNCTIONS
   */
  function walletImplementation() external returns (address);
  function createSplit(
    address[] calldata accounts,
    uint32[] calldata percentAllocations,
    uint32 distributorFee,
    address controller
  ) external returns (address);
  function predictImmutableSplitAddress(
    address[] calldata accounts,
    uint32[] calldata percentAllocations,
    uint32 distributorFee
  ) external view returns (address);
  function updateSplit(
    address split,
    address[] calldata accounts,
    uint32[] calldata percentAllocations,
    uint32 distributorFee
  ) external;
  function transferControl(address split, address newController) external;
  function cancelControlTransfer(address split) external;
  function acceptControl(address split) external;
  function makeSplitImmutable(address split) external;
  function distributeETH(
    address split,
    address[] calldata accounts,
    uint32[] calldata percentAllocations,
    uint32 distributorFee,
    address distributorAddress
  ) external;
  function updateAndDistributeETH(
    address split,
    address[] calldata accounts,
    uint32[] calldata percentAllocations,
    uint32 distributorFee,
    address distributorAddress
  ) external;
  function distributeERC20(
    address split,
    ERC20 token,
    address[] calldata accounts,
    uint32[] calldata percentAllocations,
    uint32 distributorFee,
    address distributorAddress
  ) external;
  function updateAndDistributeERC20(
    address split,
    ERC20 token,
    address[] calldata accounts,
    uint32[] calldata percentAllocations,
    uint32 distributorFee,
    address distributorAddress
  ) external;
  function withdraw(
    address account,
    uint256 withdrawETH,
    ERC20[] calldata tokens
  ) external;
  /**
   * EVENTS
   */
  /** @notice emitted after each successful split creation
   *  @param split Address of the created split
   */
  event CreateSplit(address indexed split);
  /** @notice emitted after each successful split update
   *  @param split Address of the updated split
   */
  event UpdateSplit(address indexed split);
  /** @notice emitted after each initiated split control transfer
   *  @param split Address of the split control transfer was initiated for
   *  @param newPotentialController Address of the split's new potential controller
   */
  event InitiateControlTransfer(
    address indexed split,
    address indexed newPotentialController
  );
  /** @notice emitted after each canceled split control transfer
   *  @param split Address of the split control transfer was canceled for
   */
  event CancelControlTransfer(address indexed split);
  /** @notice emitted after each successful split control transfer
   *  @param split Address of the split control was transferred for
   *  @param previousController Address of the split's previous controller
   *  @param newController Address of the split's new controller
   */
  event ControlTransfer(
    address indexed split,
    address indexed previousController,
    address indexed newController
  );
  /** @notice emitted after each successful ETH balance split
   *  @param split Address of the split that distributed its balance
   *  @param amount Amount of ETH distributed
   *  @param distributorAddress Address to credit distributor fee to
   */
  event DistributeETH(
    address indexed split,
    uint256 amount,
    address indexed distributorAddress
  );
  /** @notice emitted after each successful ERC20 balance split
   *  @param split Address of the split that distributed its balance
   *  @param token Address of ERC20 distributed
   *  @param amount Amount of ERC20 distributed
   *  @param distributorAddress Address to credit distributor fee to
   */
  event DistributeERC20(
    address indexed split,
    ERC20 indexed token,
    uint256 amount,
    address indexed distributorAddress
  );
  /** @notice emitted after each successful withdrawal
   *  @param account Address that funds were withdrawn to
   *  @param ethAmount Amount of ETH withdrawn
   *  @param tokens Addresses of ERC20s withdrawn
   *  @param tokenAmounts Amounts of corresponding ERC20s withdrawn
   */
  event Withdrawal(
    address indexed account,
    uint256 ethAmount,
    ERC20[] tokens,
    uint256[] tokenAmounts
  );
}
// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;
/// @notice Modern and gas efficient ERC20 + EIP-2612 implementation.
/// @author Solmate (https://github.com/Rari-Capital/solmate/blob/main/src/tokens/ERC20.sol)
/// @author Modified from Uniswap (https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/UniswapV2ERC20.sol)
/// @dev Do not manually set balances without updating totalSupply, as the sum of all user balances must not exceed it.
abstract contract ERC20 {
    /*///////////////////////////////////////////////////////////////
                                  EVENTS
    //////////////////////////////////////////////////////////////*/
    event Transfer(address indexed from, address indexed to, uint256 amount);
    event Approval(address indexed owner, address indexed spender, uint256 amount);
    /*///////////////////////////////////////////////////////////////
                             METADATA STORAGE
    //////////////////////////////////////////////////////////////*/
    string public name;
    string public symbol;
    uint8 public immutable decimals;
    /*///////////////////////////////////////////////////////////////
                              ERC20 STORAGE
    //////////////////////////////////////////////////////////////*/
    uint256 public totalSupply;
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;
    /*///////////////////////////////////////////////////////////////
                             EIP-2612 STORAGE
    //////////////////////////////////////////////////////////////*/
    bytes32 public constant PERMIT_TYPEHASH =
        keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    uint256 internal immutable INITIAL_CHAIN_ID;
    bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR;
    mapping(address => uint256) public nonces;
    /*///////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/
    constructor(
        string memory _name,
        string memory _symbol,
        uint8 _decimals
    ) {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;
        INITIAL_CHAIN_ID = block.chainid;
        INITIAL_DOMAIN_SEPARATOR = computeDomainSeparator();
    }
    /*///////////////////////////////////////////////////////////////
                              ERC20 LOGIC
    //////////////////////////////////////////////////////////////*/
    function approve(address spender, uint256 amount) public virtual returns (bool) {
        allowance[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }
    function transfer(address to, uint256 amount) public virtual returns (bool) {
        balanceOf[msg.sender] -= amount;
        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }
        emit Transfer(msg.sender, to, amount);
        return true;
    }
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual returns (bool) {
        uint256 allowed = allowance[from][msg.sender]; // Saves gas for limited approvals.
        if (allowed != type(uint256).max) allowance[from][msg.sender] = allowed - amount;
        balanceOf[from] -= amount;
        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }
        emit Transfer(from, to, amount);
        return true;
    }
    /*///////////////////////////////////////////////////////////////
                              EIP-2612 LOGIC
    //////////////////////////////////////////////////////////////*/
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual {
        require(deadline >= block.timestamp, "PERMIT_DEADLINE_EXPIRED");
        // Unchecked because the only math done is incrementing
        // the owner's nonce which cannot realistically overflow.
        unchecked {
            bytes32 digest = keccak256(
                abi.encodePacked(
                    "\\x19\\x01",
                    DOMAIN_SEPARATOR(),
                    keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
                )
            );
            address recoveredAddress = ecrecover(digest, v, r, s);
            require(recoveredAddress != address(0) && recoveredAddress == owner, "INVALID_SIGNER");
            allowance[recoveredAddress][spender] = value;
        }
        emit Approval(owner, spender, value);
    }
    function DOMAIN_SEPARATOR() public view virtual returns (bytes32) {
        return block.chainid == INITIAL_CHAIN_ID ? INITIAL_DOMAIN_SEPARATOR : computeDomainSeparator();
    }
    function computeDomainSeparator() internal view virtual returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                    keccak256(bytes(name)),
                    keccak256("1"),
                    block.chainid,
                    address(this)
                )
            );
    }
    /*///////////////////////////////////////////////////////////////
                       INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/
    function _mint(address to, uint256 amount) internal virtual {
        totalSupply += amount;
        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }
        emit Transfer(address(0), to, amount);
    }
    function _burn(address from, uint256 amount) internal virtual {
        balanceOf[from] -= amount;
        // Cannot underflow because a user's balance
        // will never be larger than the total supply.
        unchecked {
            totalSupply -= amount;
        }
        emit Transfer(from, address(0), amount);
    }
}
// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;
import {ERC20} from "../tokens/ERC20.sol";
/// @notice Safe ETH and ERC20 transfer library that gracefully handles missing return values.
/// @author Solmate (https://github.com/Rari-Capital/solmate/blob/main/src/utils/SafeTransferLib.sol)
/// @author Modified from Gnosis (https://github.com/gnosis/gp-v2-contracts/blob/main/src/contracts/libraries/GPv2SafeERC20.sol)
/// @dev Use with caution! Some functions in this library knowingly create dirty bits at the destination of the free memory pointer.
library SafeTransferLib {
    /*///////////////////////////////////////////////////////////////
                            ETH OPERATIONS
    //////////////////////////////////////////////////////////////*/
    function safeTransferETH(address to, uint256 amount) internal {
        bool callStatus;
        assembly {
            // Transfer the ETH and store if it succeeded or not.
            callStatus := call(gas(), to, amount, 0, 0, 0, 0)
        }
        require(callStatus, "ETH_TRANSFER_FAILED");
    }
    /*///////////////////////////////////////////////////////////////
                           ERC20 OPERATIONS
    //////////////////////////////////////////////////////////////*/
    function safeTransferFrom(
        ERC20 token,
        address from,
        address to,
        uint256 amount
    ) internal {
        bool callStatus;
        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)
            // Write the abi-encoded calldata to memory piece by piece:
            mstore(freeMemoryPointer, 0x23b872dd00000000000000000000000000000000000000000000000000000000) // Begin with the function selector.
            mstore(add(freeMemoryPointer, 4), and(from, 0xffffffffffffffffffffffffffffffffffffffff)) // Mask and append the "from" argument.
            mstore(add(freeMemoryPointer, 36), and(to, 0xffffffffffffffffffffffffffffffffffffffff)) // Mask and append the "to" argument.
            mstore(add(freeMemoryPointer, 68), amount) // Finally append the "amount" argument. No mask as it's a full 32 byte value.
            // Call the token and store if it succeeded or not.
            // We use 100 because the calldata length is 4 + 32 * 3.
            callStatus := call(gas(), token, 0, freeMemoryPointer, 100, 0, 0)
        }
        require(didLastOptionalReturnCallSucceed(callStatus), "TRANSFER_FROM_FAILED");
    }
    function safeTransfer(
        ERC20 token,
        address to,
        uint256 amount
    ) internal {
        bool callStatus;
        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)
            // Write the abi-encoded calldata to memory piece by piece:
            mstore(freeMemoryPointer, 0xa9059cbb00000000000000000000000000000000000000000000000000000000) // Begin with the function selector.
            mstore(add(freeMemoryPointer, 4), and(to, 0xffffffffffffffffffffffffffffffffffffffff)) // Mask and append the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Finally append the "amount" argument. No mask as it's a full 32 byte value.
            // Call the token and store if it succeeded or not.
            // We use 68 because the calldata length is 4 + 32 * 2.
            callStatus := call(gas(), token, 0, freeMemoryPointer, 68, 0, 0)
        }
        require(didLastOptionalReturnCallSucceed(callStatus), "TRANSFER_FAILED");
    }
    function safeApprove(
        ERC20 token,
        address to,
        uint256 amount
    ) internal {
        bool callStatus;
        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)
            // Write the abi-encoded calldata to memory piece by piece:
            mstore(freeMemoryPointer, 0x095ea7b300000000000000000000000000000000000000000000000000000000) // Begin with the function selector.
            mstore(add(freeMemoryPointer, 4), and(to, 0xffffffffffffffffffffffffffffffffffffffff)) // Mask and append the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Finally append the "amount" argument. No mask as it's a full 32 byte value.
            // Call the token and store if it succeeded or not.
            // We use 68 because the calldata length is 4 + 32 * 2.
            callStatus := call(gas(), token, 0, freeMemoryPointer, 68, 0, 0)
        }
        require(didLastOptionalReturnCallSucceed(callStatus), "APPROVE_FAILED");
    }
    /*///////////////////////////////////////////////////////////////
                         INTERNAL HELPER LOGIC
    //////////////////////////////////////////////////////////////*/
    function didLastOptionalReturnCallSucceed(bool callStatus) private pure returns (bool success) {
        assembly {
            // Get how many bytes the call returned.
            let returnDataSize := returndatasize()
            // If the call reverted:
            if iszero(callStatus) {
                // Copy the revert message into memory.
                returndatacopy(0, 0, returnDataSize)
                // Revert with the same message.
                revert(0, returnDataSize)
            }
            switch returnDataSize
            case 32 {
                // Copy the return data into memory.
                returndatacopy(0, 0, returnDataSize)
                // Set success to whether it returned true.
                success := iszero(iszero(mload(0)))
            }
            case 0 {
                // There was no return data.
                success := 1
            }
            default {
                // It returned some malformed input.
                success := 0
            }
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;
interface ISwapERC20 {
  struct OrderERC20 {
    uint256 nonce; // Unique number per signatory per order
    uint256 expiry; // Expiry time (seconds since unix epoch)
    address signerWallet; // Party to the swap that sets terms
    address signerToken; // ERC20 token address transferred from signer
    uint256 signerAmount; // Amount of tokens transferred from signer
    address senderWallet; // Party to the swap that accepts terms
    address senderToken; // ERC20 token address transferred from sender
    uint256 senderAmount; // Amount of tokens transferred from sender
    uint8 v; // ECDSA
    bytes32 r;
    bytes32 s;
  }
  event SwapERC20(uint256 indexed nonce, address indexed signerWallet);
  event Cancel(uint256 indexed nonce, address indexed signerWallet);
  event Authorize(address indexed signer, address indexed signerWallet);
  event Revoke(address indexed signer, address indexed signerWallet);
  event SetProtocolFee(uint256 protocolFee);
  event SetProtocolFeeLight(uint256 protocolFeeLight);
  event SetProtocolFeeWallet(address indexed feeWallet);
  event SetBonusScale(uint256 bonusScale);
  event SetBonusMax(uint256 bonusMax);
  event SetStaking(address indexed staking);
  error ChainIdChanged();
  error InvalidFee();
  error InvalidFeeLight();
  error InvalidFeeWallet();
  error InvalidStaking();
  error OrderExpired();
  error MaxTooHigh();
  error NonceAlreadyUsed(uint256);
  error ScaleTooHigh();
  error SignatoryInvalid();
  error SignatureInvalid();
  error TransferFromFailed();
  function swap(
    address recipient,
    uint256 nonce,
    uint256 expiry,
    address signerWallet,
    address signerToken,
    uint256 signerAmount,
    address senderToken,
    uint256 senderAmount,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external;
  function swapAnySender(
    address recipient,
    uint256 nonce,
    uint256 expiry,
    address signerWallet,
    address signerToken,
    uint256 signerAmount,
    address senderToken,
    uint256 senderAmount,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external;
  function swapLight(
    uint256 nonce,
    uint256 expiry,
    address signerWallet,
    address signerToken,
    uint256 signerAmount,
    address senderToken,
    uint256 senderAmount,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external;
  function authorize(address sender) external;
  function revoke() external;
  function cancel(uint256[] calldata nonces) external;
  function check(
    address senderWallet,
    uint256 nonce,
    uint256 expiry,
    address signerWallet,
    address signerToken,
    uint256 signerAmount,
    address senderToken,
    uint256 senderAmount,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external view returns (bytes32[] memory);
  function nonceUsed(address, uint256) external view returns (bool);
  function authorized(address) external view returns (address);
  function calculateProtocolFee(
    address,
    uint256
  ) external view returns (uint256);
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;
import { ECDSA } from "solady/src/utils/ECDSA.sol";
import { EIP712 } from "solady/src/utils/EIP712.sol";
import { ERC20 } from "solady/src/tokens/ERC20.sol";
import { Ownable } from "solady/src/auth/Ownable.sol";
import { SafeTransferLib } from "solady/src/utils/SafeTransferLib.sol";
import { SignatureCheckerLib } from "solady/src/utils/SignatureCheckerLib.sol";
import "./interfaces/ISwapERC20.sol";
/**
 * @title AirSwap: Atomic ERC20 Token Swap
 * @notice https://www.airswap.io/
 */
contract SwapERC20 is ISwapERC20, Ownable, EIP712 {
  uint256 public immutable DOMAIN_CHAIN_ID;
  bytes32 public immutable DOMAIN_SEPARATOR;
  bytes32 public constant ORDER_TYPEHASH =
    keccak256(
      abi.encodePacked(
        "OrderERC20(uint256 nonce,uint256 expiry,address signerWallet,address signerToken,uint256 signerAmount,",
        "uint256 protocolFee,address senderWallet,address senderToken,uint256 senderAmount)"
      )
    );
  uint256 public constant FEE_DIVISOR = 10000;
  uint256 private constant MAX_ERROR_COUNT = 8;
  uint256 private constant MAX_MAX = 100;
  uint256 private constant MAX_SCALE = 77;
  /**
   * @notice Double mapping of signers to nonce groups to nonce states
   * @dev The nonce group is computed as nonce / 256, so each group of 256 sequential nonces uses the same key
   * @dev The nonce states are encoded as 256 bits, for each nonce in the group 0 means available and 1 means used
   */
  mapping(address => mapping(uint256 => uint256)) private _nonceGroups;
  // Mapping of signer to authorized signatory
  mapping(address => address) public override authorized;
  uint256 public protocolFee;
  uint256 public protocolFeeLight;
  address public protocolFeeWallet;
  uint256 public bonusScale;
  uint256 public bonusMax;
  address public stakingToken;
  /**
   * @notice SwapERC20 constructor
   * @dev Sets domain and version for EIP712 signatures
   * @param _protocolFee uin256 protocol fee to be assessed on swaps
   * @param _protocolFeeWallet address destination for protocol fees
   * @param _bonusScale uin256 scale factor for bonus
   * @param _bonusMax uint256 max bonus percentage
   */
  constructor(
    uint256 _protocolFee,
    uint256 _protocolFeeLight,
    address _protocolFeeWallet,
    uint256 _bonusScale,
    uint256 _bonusMax
  ) {
    if (_protocolFee >= FEE_DIVISOR) revert InvalidFee();
    if (_protocolFeeLight >= FEE_DIVISOR) revert InvalidFeeLight();
    if (_protocolFeeWallet == address(0)) revert InvalidFeeWallet();
    if (_bonusMax > MAX_MAX) revert MaxTooHigh();
    if (_bonusScale > MAX_SCALE) revert ScaleTooHigh();
    _initializeOwner(msg.sender);
    DOMAIN_CHAIN_ID = block.chainid;
    DOMAIN_SEPARATOR = _domainSeparator();
    protocolFee = _protocolFee;
    protocolFeeLight = _protocolFeeLight;
    protocolFeeWallet = _protocolFeeWallet;
    bonusMax = _bonusMax;
    bonusScale = _bonusScale;
  }
  /**
   * @notice Return EIP712 domain values
   * @return name EIP712 domain name
   * @return version EIP712 domain version
   */
  function _domainNameAndVersion()
    internal
    pure
    override
    returns (string memory name, string memory version)
  {
    name = "SWAP_ERC20";
    version = "4.3";
  }
  /**
   * @notice Atomic ERC20 Swap
   * @param recipient address Wallet to receive sender proceeds
   * @param nonce uint256 Unique and should be sequential
   * @param expiry uint256 Expiry in seconds since 1 January 1970
   * @param signerWallet address Wallet of the signer
   * @param signerToken address ERC20 token transferred from the signer
   * @param signerAmount uint256 Amount transferred from the signer
   * @param senderToken address ERC20 token transferred from the sender
   * @param senderAmount uint256 Amount transferred from the sender
   * @param v uint8 "v" value of the ECDSA signature
   * @param r bytes32 "r" value of the ECDSA signature
   * @param s bytes32 "s" value of the ECDSA signature
   */
  function swap(
    address recipient,
    uint256 nonce,
    uint256 expiry,
    address signerWallet,
    address signerToken,
    uint256 signerAmount,
    address senderToken,
    uint256 senderAmount,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external override {
    // Ensure the order is valid
    _check(
      nonce,
      expiry,
      signerWallet,
      signerToken,
      signerAmount,
      msg.sender,
      senderToken,
      senderAmount,
      v,
      r,
      s
    );
    // Transfer token from sender to signer
    SafeTransferLib.safeTransferFrom(
      senderToken,
      msg.sender,
      signerWallet,
      senderAmount
    );
    // Transfer token from signer to recipient
    SafeTransferLib.safeTransferFrom(
      signerToken,
      signerWallet,
      recipient,
      signerAmount
    );
    // Calculate and transfer protocol fee
    _transferProtocolFee(signerToken, signerWallet, signerAmount);
    // Emit event
    emit SwapERC20(nonce, signerWallet);
  }
  /**
   * @notice Atomic ERC20 Swap for Any Sender
   * @param recipient address Wallet to receive sender proceeds
   * @param nonce uint256 Unique and should be sequential
   * @param expiry uint256 Expiry in seconds since 1 January 1970
   * @param signerWallet address Wallet of the signer
   * @param signerToken address ERC20 token transferred from the signer
   * @param signerAmount uint256 Amount transferred from the signer
   * @param senderToken address ERC20 token transferred from the sender
   * @param senderAmount uint256 Amount transferred from the sender
   * @param v uint8 "v" value of the ECDSA signature
   * @param r bytes32 "r" value of the ECDSA signature
   * @param s bytes32 "s" value of the ECDSA signature
   */
  function swapAnySender(
    address recipient,
    uint256 nonce,
    uint256 expiry,
    address signerWallet,
    address signerToken,
    uint256 signerAmount,
    address senderToken,
    uint256 senderAmount,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external override {
    // Ensure the order is valid
    _check(
      nonce,
      expiry,
      signerWallet,
      signerToken,
      signerAmount,
      address(0),
      senderToken,
      senderAmount,
      v,
      r,
      s
    );
    // Transfer token from sender to signer
    SafeTransferLib.safeTransferFrom(
      senderToken,
      msg.sender,
      signerWallet,
      senderAmount
    );
    // Transfer token from signer to recipient
    SafeTransferLib.safeTransferFrom(
      signerToken,
      signerWallet,
      recipient,
      signerAmount
    );
    // Calculate and transfer protocol fee
    _transferProtocolFee(signerToken, signerWallet, signerAmount);
    // Emit event
    emit SwapERC20(nonce, signerWallet);
  }
  /**
   * @notice Swap Atomic ERC20 Swap (Minimal Gas)
   * @dev No transfer checks. Only use with known tokens.
   * @param nonce uint256 Unique and should be sequential
   * @param expiry uint256 Expiry in seconds since 1 January 1970
   * @param signerWallet address Wallet of the signer
   * @param signerToken address ERC20 token transferred from the signer
   * @param signerAmount uint256 Amount transferred from the signer
   * @param senderToken address ERC20 token transferred from the sender
   * @param senderAmount uint256 Amount transferred from the sender
   * @param v uint8 "v" value of the ECDSA signature
   * @param r bytes32 "r" value of the ECDSA signature
   * @param s bytes32 "s" value of the ECDSA signature
   */
  function swapLight(
    uint256 nonce,
    uint256 expiry,
    address signerWallet,
    address signerToken,
    uint256 signerAmount,
    address senderToken,
    uint256 senderAmount,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external override {
    // Ensure the expiry is not passed
    if (expiry <= block.timestamp) revert OrderExpired();
    // Recover the signatory from the hash and signature
    address signatory = ECDSA.tryRecover(
      keccak256(
        abi.encodePacked(
          "\\x19\\x01", // EIP191: Indicates EIP712
          DOMAIN_SEPARATOR,
          keccak256(
            abi.encode(
              ORDER_TYPEHASH,
              nonce,
              expiry,
              signerWallet,
              signerToken,
              signerAmount,
              protocolFeeLight,
              msg.sender,
              senderToken,
              senderAmount
            )
          )
        )
      ),
      v,
      r,
      s
    );
    // Ensure the signatory is not null
    if (signatory == address(0)) revert SignatureInvalid();
    // Ensure the nonce is not yet used and if not mark it used
    if (!_markNonceAsUsed(signatory, nonce)) revert NonceAlreadyUsed(nonce);
    // Ensure signatory is authorized to sign
    if (authorized[signerWallet] != address(0)) {
      // If one is set by signer wallet, signatory must be authorized
      if (signatory != authorized[signerWallet]) revert SignatureInvalid();
    } else {
      // Otherwise, signatory must be signer wallet
      if (signatory != signerWallet) revert SignatureInvalid();
    }
    // Transfer token from sender to signer
    SafeTransferLib.safeTransferFrom(
      senderToken,
      msg.sender,
      signerWallet,
      senderAmount
    );
    // Transfer token from signer to sender
    SafeTransferLib.safeTransferFrom(
      signerToken,
      signerWallet,
      msg.sender,
      signerAmount
    );
    // Transfer protocol fee from signer to fee wallet
    SafeTransferLib.safeTransferFrom(
      signerToken,
      signerWallet,
      protocolFeeWallet,
      (signerAmount * protocolFeeLight) / FEE_DIVISOR
    );
    // Emit event
    emit SwapERC20(nonce, signerWallet);
  }
  /**
   * @notice Set the protocol fee
   * @param _protocolFee uint256 Value of the fee in basis points
   */
  function setProtocolFee(uint256 _protocolFee) external onlyOwner {
    // Ensure the fee is less than divisor
    if (_protocolFee >= FEE_DIVISOR) revert InvalidFee();
    protocolFee = _protocolFee;
    emit SetProtocolFee(_protocolFee);
  }
  /**
   * @notice Set the light protocol fee
   * @param _protocolFeeLight uint256 Value of the fee in basis points
   */
  function setProtocolFeeLight(uint256 _protocolFeeLight) external onlyOwner {
    // Ensure the fee is less than divisor
    if (_protocolFeeLight >= FEE_DIVISOR) revert InvalidFeeLight();
    protocolFeeLight = _protocolFeeLight;
    emit SetProtocolFeeLight(_protocolFeeLight);
  }
  /**
   * @notice Set the protocol fee wallet
   * @param _protocolFeeWallet address Wallet to transfer fee to
   */
  function setProtocolFeeWallet(address _protocolFeeWallet) external onlyOwner {
    // Ensure the new fee wallet is not null
    if (_protocolFeeWallet == address(0)) revert InvalidFeeWallet();
    protocolFeeWallet = _protocolFeeWallet;
    emit SetProtocolFeeWallet(_protocolFeeWallet);
  }
  /**
   * @notice Set staking bonus max
   * @dev Only owner
   * @param _bonusMax uint256
   */
  function setBonusMax(uint256 _bonusMax) external onlyOwner {
    if (_bonusMax > MAX_MAX) revert MaxTooHigh();
    bonusMax = _bonusMax;
    emit SetBonusMax(_bonusMax);
  }
  /**
   * @notice Set staking bonus scale
   * @dev Only owner
   * @param _bonusScale uint256
   */
  function setBonusScale(uint256 _bonusScale) external onlyOwner {
    if (_bonusScale > MAX_SCALE) revert ScaleTooHigh();
    bonusScale = _bonusScale;
    emit SetBonusScale(_bonusScale);
  }
  /**
   * @notice Set staking token
   * @param _stakingToken address Token to check balances on
   */
  function setStaking(address _stakingToken) external onlyOwner {
    // Ensure the new staking token is not null
    if (_stakingToken == address(0)) revert InvalidStaking();
    stakingToken = _stakingToken;
    emit SetStaking(_stakingToken);
  }
  /**
   * @notice Authorize a signatory
   * @param signatory address Wallet of the signatory to authorize
   * @dev Emits an Authorize event
   */
  function authorize(address signatory) external override {
    if (signatory == address(0)) revert SignatoryInvalid();
    authorized[msg.sender] = signatory;
    emit Authorize(signatory, msg.sender);
  }
  /**
   * @notice Revoke the signatory
   * @dev Emits a Revoke event
   */
  function revoke() external override {
    address tmp = authorized[msg.sender];
    delete authorized[msg.sender];
    emit Revoke(tmp, msg.sender);
  }
  /**
   * @notice Cancel one or more nonces
   * @dev Cancelled nonces are marked as used
   * @dev Emits a Cancel event
   * @dev Out of gas may occur in arrays of length > 400
   * @param nonces uint256[] List of nonces to cancel
   */
  function cancel(uint256[] calldata nonces) external override {
    for (uint256 i; i < nonces.length; ) {
      uint256 nonce = nonces[i];
      if (_markNonceAsUsed(msg.sender, nonce)) {
        emit Cancel(nonce, msg.sender);
      }
      unchecked {
        ++i;
      }
    }
  }
  /**
   * @notice Checks an order for errors
   * @param senderWallet address Wallet that would send the order
   * @param nonce uint256 Unique and should be sequential
   * @param expiry uint256 Expiry in seconds since 1 January 1970
   * @param signerWallet address Wallet of the signer
   * @param signerToken address ERC20 token transferred from the signer
   * @param signerAmount uint256 Amount transferred from the signer
   * @param senderToken address ERC20 token transferred from the sender
   * @param senderAmount uint256 Amount transferred from the sender
   * @param v uint8 "v" value of the ECDSA signature
   * @param r bytes32 "r" value of the ECDSA signature
   * @param s bytes32 "s" value of the ECDSA signature
   * @return bytes32[] errors
   */
  function check(
    address senderWallet,
    uint256 nonce,
    uint256 expiry,
    address signerWallet,
    address signerToken,
    uint256 signerAmount,
    address senderToken,
    uint256 senderAmount,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external view returns (bytes32[] memory) {
    bytes32[] memory errors = new bytes32[](MAX_ERROR_COUNT);
    uint256 count;
    OrderERC20 memory order;
    order.nonce = nonce;
    order.expiry = expiry;
    order.signerWallet = signerWallet;
    order.signerToken = signerToken;
    order.signerAmount = signerAmount;
    order.senderToken = senderToken;
    order.senderAmount = senderAmount;
    order.v = v;
    order.r = r;
    order.s = s;
    order.senderWallet = senderWallet;
    if (DOMAIN_CHAIN_ID != block.chainid) {
      errors[count++] = "ChainIdChanged";
    }
    // Validate as the authorized signatory if set
    address signatory = order.signerWallet;
    if (authorized[signatory] != address(0)) {
      signatory = authorized[signatory];
    }
    if (
      !SignatureCheckerLib.isValidSignatureNow(
        signatory,
        _getOrderHash(
          order.nonce,
          order.expiry,
          order.signerWallet,
          order.signerToken,
          order.signerAmount,
          order.senderWallet,
          order.senderToken,
          order.senderAmount
        ),
        abi.encodePacked(r, s, v)
      )
    ) {
      errors[count++] = "SignatureInvalid";
    } else if (nonceUsed(signatory, order.nonce)) {
      errors[count++] = "NonceAlreadyUsed";
    }
    if (order.expiry < block.timestamp) {
      errors[count++] = "OrderExpired";
    }
    if (order.senderWallet != address(0)) {
      uint256 senderBalance = ERC20(order.senderToken).balanceOf(
        order.senderWallet
      );
      uint256 senderAllowance = ERC20(order.senderToken).allowance(
        order.senderWallet,
        address(this)
      );
      if (senderAllowance < order.senderAmount) {
        errors[count++] = "SenderAllowanceLow";
      }
      if (senderBalance < order.senderAmount) {
        errors[count++] = "SenderBalanceLow";
      }
    }
    uint256 signerBalance = ERC20(order.signerToken).balanceOf(
      order.signerWallet
    );
    uint256 signerAllowance = ERC20(order.signerToken).allowance(
      order.signerWallet,
      address(this)
    );
    uint256 signerFeeAmount = (order.signerAmount * protocolFee) / FEE_DIVISOR;
    if (signerAllowance < order.signerAmount + signerFeeAmount) {
      errors[count++] = "SignerAllowanceLow";
    }
    if (signerBalance < order.signerAmount + signerFeeAmount) {
      errors[count++] = "SignerBalanceLow";
    }
    // Truncate errors array to actual count
    if (count != errors.length) {
      assembly {
        mstore(errors, count)
      }
    }
    return errors;
  }
  /**
   * @notice Calculates bonus from staking balance
   * @param stakingBalance uint256
   * @param feeAmount uint256
   */
  function calculateBonus(
    uint256 stakingBalance,
    uint256 feeAmount
  ) public view returns (uint256) {
    uint256 divisor = (uint256(10) ** bonusScale) + stakingBalance;
    return (bonusMax * stakingBalance * feeAmount) / divisor / MAX_MAX;
  }
  /**
   * @notice Calculates protocol fee for an account
   * @param wallet address
   * @param amount uint256
   */
  function calculateProtocolFee(
    address wallet,
    uint256 amount
  ) external view override returns (uint256) {
    // Transfer fee from signer to feeWallet
    uint256 feeAmount = (amount * protocolFee) / FEE_DIVISOR;
    if (stakingToken != address(0) && feeAmount > 0) {
      uint256 bonusAmount = calculateBonus(
        ERC20(stakingToken).balanceOf(wallet),
        feeAmount
      );
      return feeAmount - bonusAmount;
    }
    return feeAmount;
  }
  /**
   * @notice Returns true if the nonce has been used
   * @param signer address Address of the signer
   * @param nonce uint256 Nonce being checked
   */
  function nonceUsed(
    address signer,
    uint256 nonce
  ) public view override returns (bool) {
    uint256 groupKey = nonce / 256;
    uint256 indexInGroup = nonce % 256;
    return (_nonceGroups[signer][groupKey] >> indexInGroup) & 1 == 1;
  }
  /**
   * @notice Marks a nonce as used for the given signer
   * @param signer address Address of the signer for which to mark the nonce as used
   * @param nonce uint256 Nonce to be marked as used
   * @return bool True if the nonce was not marked as used already
   */
  function _markNonceAsUsed(
    address signer,
    uint256 nonce
  ) private returns (bool) {
    uint256 groupKey = nonce / 256;
    uint256 indexInGroup = nonce % 256;
    uint256 group = _nonceGroups[signer][groupKey];
    // If it is already used, return false
    if ((group >> indexInGroup) & 1 == 1) {
      return false;
    }
    _nonceGroups[signer][groupKey] = group | (uint256(1) << indexInGroup);
    return true;
  }
  /**
   * @notice Checks order and reverts on error
   * @param nonce uint256 Unique and should be sequential
   * @param expiry uint256 Expiry in seconds since 1 January 1970
   * @param signerWallet address Wallet of the signer
   * @param signerToken address ERC20 token transferred from the signer
   * @param signerAmount uint256 Amount transferred from the signer
   * @param senderToken address ERC20 token transferred from the sender
   * @param senderAmount uint256 Amount transferred from the sender
   * @param v uint8 "v" value of the ECDSA signature
   * @param r bytes32 "r" value of the ECDSA signature
   * @param s bytes32 "s" value of the ECDSA signature
   */
  function _check(
    uint256 nonce,
    uint256 expiry,
    address signerWallet,
    address signerToken,
    uint256 signerAmount,
    address senderWallet,
    address senderToken,
    uint256 senderAmount,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) private {
    // Ensure execution on the intended chain
    if (DOMAIN_CHAIN_ID != block.chainid) revert ChainIdChanged();
    // Ensure the expiry is not passed
    if (expiry <= block.timestamp) revert OrderExpired();
    // Validate as the authorized signatory if set
    address signatory = signerWallet;
    if (authorized[signatory] != address(0)) {
      signatory = authorized[signatory];
    }
    // Ensure the signature is correct for the order
    if (
      !SignatureCheckerLib.isValidSignatureNow(
        signatory,
        _getOrderHash(
          nonce,
          expiry,
          signerWallet,
          signerToken,
          signerAmount,
          senderWallet,
          senderToken,
          senderAmount
        ),
        abi.encodePacked(r, s, v)
      )
    ) revert SignatureInvalid();
    // Ensure the nonce is not yet used and if not mark as used
    if (!_markNonceAsUsed(signatory, nonce)) revert NonceAlreadyUsed(nonce);
  }
  /**
   * @notice Hashes order parameters
   * @param nonce uint256
   * @param expiry uint256
   * @param signerWallet address
   * @param signerToken address
   * @param signerAmount uint256
   * @param senderToken address
   * @param senderAmount uint256
   * @return bytes32
   */
  function _getOrderHash(
    uint256 nonce,
    uint256 expiry,
    address signerWallet,
    address signerToken,
    uint256 signerAmount,
    address senderWallet,
    address senderToken,
    uint256 senderAmount
  ) private view returns (bytes32) {
    return
      keccak256(
        abi.encodePacked(
          "\\x19\\x01", // EIP191: Indicates EIP712
          DOMAIN_SEPARATOR,
          keccak256(
            abi.encode(
              ORDER_TYPEHASH,
              nonce,
              expiry,
              signerWallet,
              signerToken,
              signerAmount,
              protocolFee,
              senderWallet,
              senderToken,
              senderAmount
            )
          )
        )
      );
  }
  /**
   * @notice Calculates and transfers protocol fee and staking bonus
   * @param sourceToken address
   * @param sourceWallet address
   * @param amount uint256
   */
  function _transferProtocolFee(
    address sourceToken,
    address sourceWallet,
    uint256 amount
  ) private {
    // Determine protocol fee from amount
    uint256 feeAmount = (amount * protocolFee) / FEE_DIVISOR;
    if (feeAmount > 0) {
      uint256 bonusAmount;
      if (stakingToken != address(0)) {
        // Only check staking bonus if staking token set
        bonusAmount = calculateBonus(
          ERC20(stakingToken).balanceOf(msg.sender),
          feeAmount
        );
      }
      if (bonusAmount > 0) {
        // Transfer staking bonus from source to msg.sender
        SafeTransferLib.safeTransferFrom(
          sourceToken,
          sourceWallet,
          msg.sender,
          bonusAmount
        );
        // Transfer remaining protocol fee from source to fee wallet
        SafeTransferLib.safeTransferFrom(
          sourceToken,
          sourceWallet,
          protocolFeeWallet,
          feeAmount - bonusAmount
        );
      } else {
        // Transfer full protocol fee from source to fee wallet
        SafeTransferLib.safeTransferFrom(
          sourceToken,
          sourceWallet,
          protocolFeeWallet,
          feeAmount
        );
      }
    }
  }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;
/// @notice Simple single owner authorization mixin.
/// @author Solady (https://github.com/vectorized/solady/blob/main/src/auth/Ownable.sol)
///
/// @dev Note:
/// This implementation does NOT auto-initialize the owner to `msg.sender`.
/// You MUST call the `_initializeOwner` in the constructor / initializer.
///
/// While the ownable portion follows
/// [EIP-173](https://eips.ethereum.org/EIPS/eip-173) for compatibility,
/// the nomenclature for the 2-step ownership handover may be unique to this codebase.
abstract contract Ownable {
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                       CUSTOM ERRORS                        */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev The caller is not authorized to call the function.
    error Unauthorized();
    /// @dev The `newOwner` cannot be the zero address.
    error NewOwnerIsZeroAddress();
    /// @dev The `pendingOwner` does not have a valid handover request.
    error NoHandoverRequest();
    /// @dev Cannot double-initialize.
    error AlreadyInitialized();
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                           EVENTS                           */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev The ownership is transferred from `oldOwner` to `newOwner`.
    /// This event is intentionally kept the same as OpenZeppelin's Ownable to be
    /// compatible with indexers and [EIP-173](https://eips.ethereum.org/EIPS/eip-173),
    /// despite it not being as lightweight as a single argument event.
    event OwnershipTransferred(address indexed oldOwner, address indexed newOwner);
    /// @dev An ownership handover to `pendingOwner` has been requested.
    event OwnershipHandoverRequested(address indexed pendingOwner);
    /// @dev The ownership handover to `pendingOwner` has been canceled.
    event OwnershipHandoverCanceled(address indexed pendingOwner);
    /// @dev `keccak256(bytes("OwnershipTransferred(address,address)"))`.
    uint256 private constant _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE =
        0x8be0079c531659141344cd1fd0a4f28419497f9722a3daafe3b4186f6b6457e0;
    /// @dev `keccak256(bytes("OwnershipHandoverRequested(address)"))`.
    uint256 private constant _OWNERSHIP_HANDOVER_REQUESTED_EVENT_SIGNATURE =
        0xdbf36a107da19e49527a7176a1babf963b4b0ff8cde35ee35d6cd8f1f9ac7e1d;
    /// @dev `keccak256(bytes("OwnershipHandoverCanceled(address)"))`.
    uint256 private constant _OWNERSHIP_HANDOVER_CANCELED_EVENT_SIGNATURE =
        0xfa7b8eab7da67f412cc9575ed43464468f9bfbae89d1675917346ca6d8fe3c92;
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                          STORAGE                           */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev The owner slot is given by:
    /// `bytes32(~uint256(uint32(bytes4(keccak256("_OWNER_SLOT_NOT")))))`.
    /// It is intentionally chosen to be a high value
    /// to avoid collision with lower slots.
    /// The choice of manual storage layout is to enable compatibility
    /// with both regular and upgradeable contracts.
    bytes32 internal constant _OWNER_SLOT =
        0xffffffffffffffffffffffffffffffffffffffffffffffffffffffff74873927;
    /// The ownership handover slot of `newOwner` is given by:
    /// ```
    ///     mstore(0x00, or(shl(96, user), _HANDOVER_SLOT_SEED))
    ///     let handoverSlot := keccak256(0x00, 0x20)
    /// ```
    /// It stores the expiry timestamp of the two-step ownership handover.
    uint256 private constant _HANDOVER_SLOT_SEED = 0x389a75e1;
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                     INTERNAL FUNCTIONS                     */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev Override to return true to make `_initializeOwner` prevent double-initialization.
    function _guardInitializeOwner() internal pure virtual returns (bool guard) {}
    /// @dev Initializes the owner directly without authorization guard.
    /// This function must be called upon initialization,
    /// regardless of whether the contract is upgradeable or not.
    /// This is to enable generalization to both regular and upgradeable contracts,
    /// and to save gas in case the initial owner is not the caller.
    /// For performance reasons, this function will not check if there
    /// is an existing owner.
    function _initializeOwner(address newOwner) internal virtual {
        if (_guardInitializeOwner()) {
            /// @solidity memory-safe-assembly
            assembly {
                let ownerSlot := _OWNER_SLOT
                if sload(ownerSlot) {
                    mstore(0x00, 0x0dc149f0) // `AlreadyInitialized()`.
                    revert(0x1c, 0x04)
                }
                // Clean the upper 96 bits.
                newOwner := shr(96, shl(96, newOwner))
                // Store the new value.
                sstore(ownerSlot, or(newOwner, shl(255, iszero(newOwner))))
                // Emit the {OwnershipTransferred} event.
                log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, 0, newOwner)
            }
        } else {
            /// @solidity memory-safe-assembly
            assembly {
                // Clean the upper 96 bits.
                newOwner := shr(96, shl(96, newOwner))
                // Store the new value.
                sstore(_OWNER_SLOT, newOwner)
                // Emit the {OwnershipTransferred} event.
                log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, 0, newOwner)
            }
        }
    }
    /// @dev Sets the owner directly without authorization guard.
    function _setOwner(address newOwner) internal virtual {
        if (_guardInitializeOwner()) {
            /// @solidity memory-safe-assembly
            assembly {
                let ownerSlot := _OWNER_SLOT
                // Clean the upper 96 bits.
                newOwner := shr(96, shl(96, newOwner))
                // Emit the {OwnershipTransferred} event.
                log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, sload(ownerSlot), newOwner)
                // Store the new value.
                sstore(ownerSlot, or(newOwner, shl(255, iszero(newOwner))))
            }
        } else {
            /// @solidity memory-safe-assembly
            assembly {
                let ownerSlot := _OWNER_SLOT
                // Clean the upper 96 bits.
                newOwner := shr(96, shl(96, newOwner))
                // Emit the {OwnershipTransferred} event.
                log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, sload(ownerSlot), newOwner)
                // Store the new value.
                sstore(ownerSlot, newOwner)
            }
        }
    }
    /// @dev Throws if the sender is not the owner.
    function _checkOwner() internal view virtual {
        /// @solidity memory-safe-assembly
        assembly {
            // If the caller is not the stored owner, revert.
            if iszero(eq(caller(), sload(_OWNER_SLOT))) {
                mstore(0x00, 0x82b42900) // `Unauthorized()`.
                revert(0x1c, 0x04)
            }
        }
    }
    /// @dev Returns how long a two-step ownership handover is valid for in seconds.
    /// Override to return a different value if needed.
    /// Made internal to conserve bytecode. Wrap it in a public function if needed.
    function _ownershipHandoverValidFor() internal view virtual returns (uint64) {
        return 48 * 3600;
    }
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                  PUBLIC UPDATE FUNCTIONS                   */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev Allows the owner to transfer the ownership to `newOwner`.
    function transferOwnership(address newOwner) public payable virtual onlyOwner {
        /// @solidity memory-safe-assembly
        assembly {
            if iszero(shl(96, newOwner)) {
                mstore(0x00, 0x7448fbae) // `NewOwnerIsZeroAddress()`.
                revert(0x1c, 0x04)
            }
        }
        _setOwner(newOwner);
    }
    /// @dev Allows the owner to renounce their ownership.
    function renounceOwnership() public payable virtual onlyOwner {
        _setOwner(address(0));
    }
    /// @dev Request a two-step ownership handover to the caller.
    /// The request will automatically expire in 48 hours (172800 seconds) by default.
    function requestOwnershipHandover() public payable virtual {
        unchecked {
            uint256 expires = block.timestamp + _ownershipHandoverValidFor();
            /// @solidity memory-safe-assembly
            assembly {
                // Compute and set the handover slot to `expires`.
                mstore(0x0c, _HANDOVER_SLOT_SEED)
                mstore(0x00, caller())
                sstore(keccak256(0x0c, 0x20), expires)
                // Emit the {OwnershipHandoverRequested} event.
                log2(0, 0, _OWNERSHIP_HANDOVER_REQUESTED_EVENT_SIGNATURE, caller())
            }
        }
    }
    /// @dev Cancels the two-step ownership handover to the caller, if any.
    function cancelOwnershipHandover() public payable virtual {
        /// @solidity memory-safe-assembly
        assembly {
            // Compute and set the handover slot to 0.
            mstore(0x0c, _HANDOVER_SLOT_SEED)
            mstore(0x00, caller())
            sstore(keccak256(0x0c, 0x20), 0)
            // Emit the {OwnershipHandoverCanceled} event.
            log2(0, 0, _OWNERSHIP_HANDOVER_CANCELED_EVENT_SIGNATURE, caller())
        }
    }
    /// @dev Allows the owner to complete the two-step ownership handover to `pendingOwner`.
    /// Reverts if there is no existing ownership handover requested by `pendingOwner`.
    function completeOwnershipHandover(address pendingOwner) public payable virtual onlyOwner {
        /// @solidity memory-safe-assembly
        assembly {
            // Compute and set the handover slot to 0.
            mstore(0x0c, _HANDOVER_SLOT_SEED)
            mstore(0x00, pendingOwner)
            let handoverSlot := keccak256(0x0c, 0x20)
            // If the handover does not exist, or has expired.
            if gt(timestamp(), sload(handoverSlot)) {
                mstore(0x00, 0x6f5e8818) // `NoHandoverRequest()`.
                revert(0x1c, 0x04)
            }
            // Set the handover slot to 0.
            sstore(handoverSlot, 0)
        }
        _setOwner(pendingOwner);
    }
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                   PUBLIC READ FUNCTIONS                    */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev Returns the owner of the contract.
    function owner() public view virtual returns (address result) {
        /// @solidity memory-safe-assembly
        assembly {
            result := sload(_OWNER_SLOT)
        }
    }
    /// @dev Returns the expiry timestamp for the two-step ownership handover to `pendingOwner`.
    function ownershipHandoverExpiresAt(address pendingOwner)
        public
        view
        virtual
        returns (uint256 result)
    {
        /// @solidity memory-safe-assembly
        assembly {
            // Compute the handover slot.
            mstore(0x0c, _HANDOVER_SLOT_SEED)
            mstore(0x00, pendingOwner)
            // Load the handover slot.
            result := sload(keccak256(0x0c, 0x20))
        }
    }
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                         MODIFIERS                          */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev Marks a function as only callable by the owner.
    modifier onlyOwner() virtual {
        _checkOwner();
        _;
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;
/// @notice Simple ERC20 + EIP-2612 implementation.
/// @author Solady (https://github.com/vectorized/solady/blob/main/src/tokens/ERC20.sol)
/// @author Modified from Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC20.sol)
/// @author Modified from OpenZeppelin (https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol)
///
/// @dev Note:
/// - The ERC20 standard allows minting and transferring to and from the zero address,
///   minting and transferring zero tokens, as well as self-approvals.
///   For performance, this implementation WILL NOT revert for such actions.
///   Please add any checks with overrides if desired.
/// - The `permit` function uses the ecrecover precompile (0x1).
///
/// If you are overriding:
/// - NEVER violate the ERC20 invariant:
///   the total sum of all balances must be equal to `totalSupply()`.
/// - Check that the overridden function is actually used in the function you want to
///   change the behavior of. Much of the code has been manually inlined for performance.
abstract contract ERC20 {
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                       CUSTOM ERRORS                        */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev The total supply has overflowed.
    error TotalSupplyOverflow();
    /// @dev The allowance has overflowed.
    error AllowanceOverflow();
    /// @dev The allowance has underflowed.
    error AllowanceUnderflow();
    /// @dev Insufficient balance.
    error InsufficientBalance();
    /// @dev Insufficient allowance.
    error InsufficientAllowance();
    /// @dev The permit is invalid.
    error InvalidPermit();
    /// @dev The permit has expired.
    error PermitExpired();
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                           EVENTS                           */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev Emitted when `amount` tokens is transferred from `from` to `to`.
    event Transfer(address indexed from, address indexed to, uint256 amount);
    /// @dev Emitted when `amount` tokens is approved by `owner` to be used by `spender`.
    event Approval(address indexed owner, address indexed spender, uint256 amount);
    /// @dev `keccak256(bytes("Transfer(address,address,uint256)"))`.
    uint256 private constant _TRANSFER_EVENT_SIGNATURE =
        0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef;
    /// @dev `keccak256(bytes("Approval(address,address,uint256)"))`.
    uint256 private constant _APPROVAL_EVENT_SIGNATURE =
        0x8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925;
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                          STORAGE                           */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev The storage slot for the total supply.
    uint256 private constant _TOTAL_SUPPLY_SLOT = 0x05345cdf77eb68f44c;
    /// @dev The balance slot of `owner` is given by:
    /// ```
    ///     mstore(0x0c, _BALANCE_SLOT_SEED)
    ///     mstore(0x00, owner)
    ///     let balanceSlot := keccak256(0x0c, 0x20)
    /// ```
    uint256 private constant _BALANCE_SLOT_SEED = 0x87a211a2;
    /// @dev The allowance slot of (`owner`, `spender`) is given by:
    /// ```
    ///     mstore(0x20, spender)
    ///     mstore(0x0c, _ALLOWANCE_SLOT_SEED)
    ///     mstore(0x00, owner)
    ///     let allowanceSlot := keccak256(0x0c, 0x34)
    /// ```
    uint256 private constant _ALLOWANCE_SLOT_SEED = 0x7f5e9f20;
    /// @dev The nonce slot of `owner` is given by:
    /// ```
    ///     mstore(0x0c, _NONCES_SLOT_SEED)
    ///     mstore(0x00, owner)
    ///     let nonceSlot := keccak256(0x0c, 0x20)
    /// ```
    uint256 private constant _NONCES_SLOT_SEED = 0x38377508;
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                         CONSTANTS                          */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev `(_NONCES_SLOT_SEED << 16) | 0x1901`.
    uint256 private constant _NONCES_SLOT_SEED_WITH_SIGNATURE_PREFIX = 0x383775081901;
    /// @dev `keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)")`.
    bytes32 private constant _DOMAIN_TYPEHASH =
        0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f;
    /// @dev `keccak256("1")`.
    bytes32 private constant _VERSION_HASH =
        0xc89efdaa54c0f20c7adf612882df0950f5a951637e0307cdcb4c672f298b8bc6;
    /// @dev `keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)")`.
    bytes32 private constant _PERMIT_TYPEHASH =
        0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                       ERC20 METADATA                       */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev Returns the name of the token.
    function name() public view virtual returns (string memory);
    /// @dev Returns the symbol of the token.
    function symbol() public view virtual returns (string memory);
    /// @dev Returns the decimals places of the token.
    function decimals() public view virtual returns (uint8) {
        return 18;
    }
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                           ERC20                            */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev Returns the amount of tokens in existence.
    function totalSupply() public view virtual returns (uint256 result) {
        /// @solidity memory-safe-assembly
        assembly {
            result := sload(_TOTAL_SUPPLY_SLOT)
        }
    }
    /// @dev Returns the amount of tokens owned by `owner`.
    function balanceOf(address owner) public view virtual returns (uint256 result) {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x0c, _BALANCE_SLOT_SEED)
            mstore(0x00, owner)
            result := sload(keccak256(0x0c, 0x20))
        }
    }
    /// @dev Returns the amount of tokens that `spender` can spend on behalf of `owner`.
    function allowance(address owner, address spender)
        public
        view
        virtual
        returns (uint256 result)
    {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x20, spender)
            mstore(0x0c, _ALLOWANCE_SLOT_SEED)
            mstore(0x00, owner)
            result := sload(keccak256(0x0c, 0x34))
        }
    }
    /// @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
    ///
    /// Emits a {Approval} event.
    function approve(address spender, uint256 amount) public virtual returns (bool) {
        /// @solidity memory-safe-assembly
        assembly {
            // Compute the allowance slot and store the amount.
            mstore(0x20, spender)
            mstore(0x0c, _ALLOWANCE_SLOT_SEED)
            mstore(0x00, caller())
            sstore(keccak256(0x0c, 0x34), amount)
            // Emit the {Approval} event.
            mstore(0x00, amount)
            log3(0x00, 0x20, _APPROVAL_EVENT_SIGNATURE, caller(), shr(96, mload(0x2c)))
        }
        return true;
    }
    /// @dev Transfer `amount` tokens from the caller to `to`.
    ///
    /// Requirements:
    /// - `from` must at least have `amount`.
    ///
    /// Emits a {Transfer} event.
    function transfer(address to, uint256 amount) public virtual returns (bool) {
        _beforeTokenTransfer(msg.sender, to, amount);
        /// @solidity memory-safe-assembly
        assembly {
            // Compute the balance slot and load its value.
            mstore(0x0c, _BALANCE_SLOT_SEED)
            mstore(0x00, caller())
            let fromBalanceSlot := keccak256(0x0c, 0x20)
            let fromBalance := sload(fromBalanceSlot)
            // Revert if insufficient balance.
            if gt(amount, fromBalance) {
                mstore(0x00, 0xf4d678b8) // `InsufficientBalance()`.
                revert(0x1c, 0x04)
            }
            // Subtract and store the updated balance.
            sstore(fromBalanceSlot, sub(fromBalance, amount))
            // Compute the balance slot of `to`.
            mstore(0x00, to)
            let toBalanceSlot := keccak256(0x0c, 0x20)
            // Add and store the updated balance of `to`.
            // Will not overflow because the sum of all user balances
            // cannot exceed the maximum uint256 value.
            sstore(toBalanceSlot, add(sload(toBalanceSlot), amount))
            // Emit the {Transfer} event.
            mstore(0x20, amount)
            log3(0x20, 0x20, _TRANSFER_EVENT_SIGNATURE, caller(), shr(96, mload(0x0c)))
        }
        _afterTokenTransfer(msg.sender, to, amount);
        return true;
    }
    /// @dev Transfers `amount` tokens from `from` to `to`.
    ///
    /// Note: Does not update the allowance if it is the maximum uint256 value.
    ///
    /// Requirements:
    /// - `from` must at least have `amount`.
    /// - The caller must have at least `amount` of allowance to transfer the tokens of `from`.
    ///
    /// Emits a {Transfer} event.
    function transferFrom(address from, address to, uint256 amount) public virtual returns (bool) {
        _beforeTokenTransfer(from, to, amount);
        /// @solidity memory-safe-assembly
        assembly {
            let from_ := shl(96, from)
            // Compute the allowance slot and load its value.
            mstore(0x20, caller())
            mstore(0x0c, or(from_, _ALLOWANCE_SLOT_SEED))
            let allowanceSlot := keccak256(0x0c, 0x34)
            let allowance_ := sload(allowanceSlot)
            // If the allowance is not the maximum uint256 value.
            if add(allowance_, 1) {
                // Revert if the amount to be transferred exceeds the allowance.
                if gt(amount, allowance_) {
                    mstore(0x00, 0x13be252b) // `InsufficientAllowance()`.
                    revert(0x1c, 0x04)
                }
                // Subtract and store the updated allowance.
                sstore(allowanceSlot, sub(allowance_, amount))
            }
            // Compute the balance slot and load its value.
            mstore(0x0c, or(from_, _BALANCE_SLOT_SEED))
            let fromBalanceSlot := keccak256(0x0c, 0x20)
            let fromBalance := sload(fromBalanceSlot)
            // Revert if insufficient balance.
            if gt(amount, fromBalance) {
                mstore(0x00, 0xf4d678b8) // `InsufficientBalance()`.
                revert(0x1c, 0x04)
            }
            // Subtract and store the updated balance.
            sstore(fromBalanceSlot, sub(fromBalance, amount))
            // Compute the balance slot of `to`.
            mstore(0x00, to)
            let toBalanceSlot := keccak256(0x0c, 0x20)
            // Add and store the updated balance of `to`.
            // Will not overflow because the sum of all user balances
            // cannot exceed the maximum uint256 value.
            sstore(toBalanceSlot, add(sload(toBalanceSlot), amount))
            // Emit the {Transfer} event.
            mstore(0x20, amount)
            log3(0x20, 0x20, _TRANSFER_EVENT_SIGNATURE, shr(96, from_), shr(96, mload(0x0c)))
        }
        _afterTokenTransfer(from, to, amount);
        return true;
    }
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                          EIP-2612                          */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev For more performance, override to return the constant value
    /// of `keccak256(bytes(name()))` if `name()` will never change.
    function _constantNameHash() internal view virtual returns (bytes32 result) {}
    /// @dev Returns the current nonce for `owner`.
    /// This value is used to compute the signature for EIP-2612 permit.
    function nonces(address owner) public view virtual returns (uint256 result) {
        /// @solidity memory-safe-assembly
        assembly {
            // Compute the nonce slot and load its value.
            mstore(0x0c, _NONCES_SLOT_SEED)
            mstore(0x00, owner)
            result := sload(keccak256(0x0c, 0x20))
        }
    }
    /// @dev Sets `value` as the allowance of `spender` over the tokens of `owner`,
    /// authorized by a signed approval by `owner`.
    ///
    /// Emits a {Approval} event.
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual {
        bytes32 nameHash = _constantNameHash();
        //  We simply calculate it on-the-fly to allow for cases where the `name` may change.
        if (nameHash == bytes32(0)) nameHash = keccak256(bytes(name()));
        /// @solidity memory-safe-assembly
        assembly {
            // Revert if the block timestamp is greater than `deadline`.
            if gt(timestamp(), deadline) {
                mstore(0x00, 0x1a15a3cc) // `PermitExpired()`.
                revert(0x1c, 0x04)
            }
            let m := mload(0x40) // Grab the free memory pointer.
            // Clean the upper 96 bits.
            owner := shr(96, shl(96, owner))
            spender := shr(96, shl(96, spender))
            // Compute the nonce slot and load its value.
            mstore(0x0e, _NONCES_SLOT_SEED_WITH_SIGNATURE_PREFIX)
            mstore(0x00, owner)
            let nonceSlot := keccak256(0x0c, 0x20)
            let nonceValue := sload(nonceSlot)
            // Prepare the domain separator.
            mstore(m, _DOMAIN_TYPEHASH)
            mstore(add(m, 0x20), nameHash)
            mstore(add(m, 0x40), _VERSION_HASH)
            mstore(add(m, 0x60), chainid())
            mstore(add(m, 0x80), address())
            mstore(0x2e, keccak256(m, 0xa0))
            // Prepare the struct hash.
            mstore(m, _PERMIT_TYPEHASH)
            mstore(add(m, 0x20), owner)
            mstore(add(m, 0x40), spender)
            mstore(add(m, 0x60), value)
            mstore(add(m, 0x80), nonceValue)
            mstore(add(m, 0xa0), deadline)
            mstore(0x4e, keccak256(m, 0xc0))
            // Prepare the ecrecover calldata.
            mstore(0x00, keccak256(0x2c, 0x42))
            mstore(0x20, and(0xff, v))
            mstore(0x40, r)
            mstore(0x60, s)
            let t := staticcall(gas(), 1, 0, 0x80, 0x20, 0x20)
            // If the ecrecover fails, the returndatasize will be 0x00,
            // `owner` will be checked if it equals the hash at 0x00,
            // which evaluates to false (i.e. 0), and we will revert.
            // If the ecrecover succeeds, the returndatasize will be 0x20,
            // `owner` will be compared against the returned address at 0x20.
            if iszero(eq(mload(returndatasize()), owner)) {
                mstore(0x00, 0xddafbaef) // `InvalidPermit()`.
                revert(0x1c, 0x04)
            }
            // Increment and store the updated nonce.
            sstore(nonceSlot, add(nonceValue, t)) // `t` is 1 if ecrecover succeeds.
            // Compute the allowance slot and store the value.
            // The `owner` is already at slot 0x20.
            mstore(0x40, or(shl(160, _ALLOWANCE_SLOT_SEED), spender))
            sstore(keccak256(0x2c, 0x34), value)
            // Emit the {Approval} event.
            log3(add(m, 0x60), 0x20, _APPROVAL_EVENT_SIGNATURE, owner, spender)
            mstore(0x40, m) // Restore the free memory pointer.
            mstore(0x60, 0) // Restore the zero pointer.
        }
    }
    /// @dev Returns the EIP-712 domain separator for the EIP-2612 permit.
    function DOMAIN_SEPARATOR() public view virtual returns (bytes32 result) {
        bytes32 nameHash = _constantNameHash();
        //  We simply calculate it on-the-fly to allow for cases where the `name` may change.
        if (nameHash == bytes32(0)) nameHash = keccak256(bytes(name()));
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40) // Grab the free memory pointer.
            mstore(m, _DOMAIN_TYPEHASH)
            mstore(add(m, 0x20), nameHash)
            mstore(add(m, 0x40), _VERSION_HASH)
            mstore(add(m, 0x60), chainid())
            mstore(add(m, 0x80), address())
            result := keccak256(m, 0xa0)
        }
    }
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                  INTERNAL MINT FUNCTIONS                   */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev Mints `amount` tokens to `to`, increasing the total supply.
    ///
    /// Emits a {Transfer} event.
    function _mint(address to, uint256 amount) internal virtual {
        _beforeTokenTransfer(address(0), to, amount);
        /// @solidity memory-safe-assembly
        assembly {
            let totalSupplyBefore := sload(_TOTAL_SUPPLY_SLOT)
            let totalSupplyAfter := add(totalSupplyBefore, amount)
            // Revert if the total supply overflows.
            if lt(totalSupplyAfter, totalSupplyBefore) {
                mstore(0x00, 0xe5cfe957) // `TotalSupplyOverflow()`.
                revert(0x1c, 0x04)
            }
            // Store the updated total supply.
            sstore(_TOTAL_SUPPLY_SLOT, totalSupplyAfter)
            // Compute the balance slot and load its value.
            mstore(0x0c, _BALANCE_SLOT_SEED)
            mstore(0x00, to)
            let toBalanceSlot := keccak256(0x0c, 0x20)
            // Add and store the updated balance.
            sstore(toBalanceSlot, add(sload(toBalanceSlot), amount))
            // Emit the {Transfer} event.
            mstore(0x20, amount)
            log3(0x20, 0x20, _TRANSFER_EVENT_SIGNATURE, 0, shr(96, mload(0x0c)))
        }
        _afterTokenTransfer(address(0), to, amount);
    }
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                  INTERNAL BURN FUNCTIONS                   */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev Burns `amount` tokens from `from`, reducing the total supply.
    ///
    /// Emits a {Transfer} event.
    function _burn(address from, uint256 amount) internal virtual {
        _beforeTokenTransfer(from, address(0), amount);
        /// @solidity memory-safe-assembly
        assembly {
            // Compute the balance slot and load its value.
            mstore(0x0c, _BALANCE_SLOT_SEED)
            mstore(0x00, from)
            let fromBalanceSlot := keccak256(0x0c, 0x20)
            let fromBalance := sload(fromBalanceSlot)
            // Revert if insufficient balance.
            if gt(amount, fromBalance) {
                mstore(0x00, 0xf4d678b8) // `InsufficientBalance()`.
                revert(0x1c, 0x04)
            }
            // Subtract and store the updated balance.
            sstore(fromBalanceSlot, sub(fromBalance, amount))
            // Subtract and store the updated total supply.
            sstore(_TOTAL_SUPPLY_SLOT, sub(sload(_TOTAL_SUPPLY_SLOT), amount))
            // Emit the {Transfer} event.
            mstore(0x00, amount)
            log3(0x00, 0x20, _TRANSFER_EVENT_SIGNATURE, shr(96, shl(96, from)), 0)
        }
        _afterTokenTransfer(from, address(0), amount);
    }
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                INTERNAL TRANSFER FUNCTIONS                 */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev Moves `amount` of tokens from `from` to `to`.
    function _transfer(address from, address to, uint256 amount) internal virtual {
        _beforeTokenTransfer(from, to, amount);
        /// @solidity memory-safe-assembly
        assembly {
            let from_ := shl(96, from)
            // Compute the balance slot and load its value.
            mstore(0x0c, or(from_, _BALANCE_SLOT_SEED))
            let fromBalanceSlot := keccak256(0x0c, 0x20)
            let fromBalance := sload(fromBalanceSlot)
            // Revert if insufficient balance.
            if gt(amount, fromBalance) {
                mstore(0x00, 0xf4d678b8) // `InsufficientBalance()`.
                revert(0x1c, 0x04)
            }
            // Subtract and store the updated balance.
            sstore(fromBalanceSlot, sub(fromBalance, amount))
            // Compute the balance slot of `to`.
            mstore(0x00, to)
            let toBalanceSlot := keccak256(0x0c, 0x20)
            // Add and store the updated balance of `to`.
            // Will not overflow because the sum of all user balances
            // cannot exceed the maximum uint256 value.
            sstore(toBalanceSlot, add(sload(toBalanceSlot), amount))
            // Emit the {Transfer} event.
            mstore(0x20, amount)
            log3(0x20, 0x20, _TRANSFER_EVENT_SIGNATURE, shr(96, from_), shr(96, mload(0x0c)))
        }
        _afterTokenTransfer(from, to, amount);
    }
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                INTERNAL ALLOWANCE FUNCTIONS                */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev Updates the allowance of `owner` for `spender` based on spent `amount`.
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        /// @solidity memory-safe-assembly
        assembly {
            // Compute the allowance slot and load its value.
            mstore(0x20, spender)
            mstore(0x0c, _ALLOWANCE_SLOT_SEED)
            mstore(0x00, owner)
            let allowanceSlot := keccak256(0x0c, 0x34)
            let allowance_ := sload(allowanceSlot)
            // If the allowance is not the maximum uint256 value.
            if add(allowance_, 1) {
                // Revert if the amount to be transferred exceeds the allowance.
                if gt(amount, allowance_) {
                    mstore(0x00, 0x13be252b) // `InsufficientAllowance()`.
                    revert(0x1c, 0x04)
                }
                // Subtract and store the updated allowance.
                sstore(allowanceSlot, sub(allowance_, amount))
            }
        }
    }
    /// @dev Sets `amount` as the allowance of `spender` over the tokens of `owner`.
    ///
    /// Emits a {Approval} event.
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        /// @solidity memory-safe-assembly
        assembly {
            let owner_ := shl(96, owner)
            // Compute the allowance slot and store the amount.
            mstore(0x20, spender)
            mstore(0x0c, or(owner_, _ALLOWANCE_SLOT_SEED))
            sstore(keccak256(0x0c, 0x34), amount)
            // Emit the {Approval} event.
            mstore(0x00, amount)
            log3(0x00, 0x20, _APPROVAL_EVENT_SIGNATURE, shr(96, owner_), shr(96, mload(0x2c)))
        }
    }
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                     HOOKS TO OVERRIDE                      */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev Hook that is called before any transfer of tokens.
    /// This includes minting and burning.
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}
    /// @dev Hook that is called after any transfer of tokens.
    /// This includes minting and burning.
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;
/// @notice Gas optimized ECDSA wrapper.
/// @author Solady (https://github.com/vectorized/solady/blob/main/src/utils/ECDSA.sol)
/// @author Modified from Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/ECDSA.sol)
/// @author Modified from OpenZeppelin (https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/cryptography/ECDSA.sol)
///
/// @dev Note:
/// - The recovery functions use the ecrecover precompile (0x1).
/// - As of Solady version 0.0.68, the `recover` variants will revert upon recovery failure.
///   This is for more safety by default.
///   Use the `tryRecover` variants if you need to get the zero address back
///   upon recovery failure instead.
/// - As of Solady version 0.0.134, all `bytes signature` variants accept both
///   regular 65-byte `(r, s, v)` and EIP-2098 `(r, vs)` short form signatures.
///   See: https://eips.ethereum.org/EIPS/eip-2098
///   This is for calldata efficiency on smart accounts prevalent on L2s.
///
/// WARNING! Do NOT use signatures as unique identifiers:
/// - Use a nonce in the digest to prevent replay attacks on the same contract.
/// - Use EIP-712 for the digest to prevent replay attacks across different chains and contracts.
///   EIP-712 also enables readable signing of typed data for better user safety.
/// This implementation does NOT check if a signature is non-malleable.
library ECDSA {
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                        CUSTOM ERRORS                       */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev The signature is invalid.
    error InvalidSignature();
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                    RECOVERY OPERATIONS                     */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev Recovers the signer's address from a message digest `hash`, and the `signature`.
    function recover(bytes32 hash, bytes memory signature) internal view returns (address result) {
        /// @solidity memory-safe-assembly
        assembly {
            result := 1
            let m := mload(0x40) // Cache the free memory pointer.
            for {} 1 {} {
                mstore(0x00, hash)
                mstore(0x40, mload(add(signature, 0x20))) // `r`.
                if eq(mload(signature), 64) {
                    let vs := mload(add(signature, 0x40))
                    mstore(0x20, add(shr(255, vs), 27)) // `v`.
                    mstore(0x60, shr(1, shl(1, vs))) // `s`.
                    break
                }
                if eq(mload(signature), 65) {
                    mstore(0x20, byte(0, mload(add(signature, 0x60)))) // `v`.
                    mstore(0x60, mload(add(signature, 0x40))) // `s`.
                    break
                }
                result := 0
                break
            }
            result :=
                mload(
                    staticcall(
                        gas(), // Amount of gas left for the transaction.
                        result, // Address of `ecrecover`.
                        0x00, // Start of input.
                        0x80, // Size of input.
                        0x01, // Start of output.
                        0x20 // Size of output.
                    )
                )
            // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
            if iszero(returndatasize()) {
                mstore(0x00, 0x8baa579f) // `InvalidSignature()`.
                revert(0x1c, 0x04)
            }
            mstore(0x60, 0) // Restore the zero slot.
            mstore(0x40, m) // Restore the free memory pointer.
        }
    }
    /// @dev Recovers the signer's address from a message digest `hash`, and the `signature`.
    function recoverCalldata(bytes32 hash, bytes calldata signature)
        internal
        view
        returns (address result)
    {
        /// @solidity memory-safe-assembly
        assembly {
            result := 1
            let m := mload(0x40) // Cache the free memory pointer.
            mstore(0x00, hash)
            for {} 1 {} {
                if eq(signature.length, 64) {
                    let vs := calldataload(add(signature.offset, 0x20))
                    mstore(0x20, add(shr(255, vs), 27)) // `v`.
                    mstore(0x40, calldataload(signature.offset)) // `r`.
                    mstore(0x60, shr(1, shl(1, vs))) // `s`.
                    break
                }
                if eq(signature.length, 65) {
                    mstore(0x20, byte(0, calldataload(add(signature.offset, 0x40)))) // `v`.
                    calldatacopy(0x40, signature.offset, 0x40) // Copy `r` and `s`.
                    break
                }
                result := 0
                break
            }
            result :=
                mload(
                    staticcall(
                        gas(), // Amount of gas left for the transaction.
                        result, // Address of `ecrecover`.
                        0x00, // Start of input.
                        0x80, // Size of input.
                        0x01, // Start of output.
                        0x20 // Size of output.
                    )
                )
            // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
            if iszero(returndatasize()) {
                mstore(0x00, 0x8baa579f) // `InvalidSignature()`.
                revert(0x1c, 0x04)
            }
            mstore(0x60, 0) // Restore the zero slot.
            mstore(0x40, m) // Restore the free memory pointer.
        }
    }
    /// @dev Recovers the signer's address from a message digest `hash`,
    /// and the EIP-2098 short form signature defined by `r` and `vs`.
    function recover(bytes32 hash, bytes32 r, bytes32 vs) internal view returns (address result) {
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40) // Cache the free memory pointer.
            mstore(0x00, hash)
            mstore(0x20, add(shr(255, vs), 27)) // `v`.
            mstore(0x40, r)
            mstore(0x60, shr(1, shl(1, vs))) // `s`.
            result :=
                mload(
                    staticcall(
                        gas(), // Amount of gas left for the transaction.
                        1, // Address of `ecrecover`.
                        0x00, // Start of input.
                        0x80, // Size of input.
                        0x01, // Start of output.
                        0x20 // Size of output.
                    )
                )
            // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
            if iszero(returndatasize()) {
                mstore(0x00, 0x8baa579f) // `InvalidSignature()`.
                revert(0x1c, 0x04)
            }
            mstore(0x60, 0) // Restore the zero slot.
            mstore(0x40, m) // Restore the free memory pointer.
        }
    }
    /// @dev Recovers the signer's address from a message digest `hash`,
    /// and the signature defined by `v`, `r`, `s`.
    function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s)
        internal
        view
        returns (address result)
    {
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40) // Cache the free memory pointer.
            mstore(0x00, hash)
            mstore(0x20, and(v, 0xff))
            mstore(0x40, r)
            mstore(0x60, s)
            result :=
                mload(
                    staticcall(
                        gas(), // Amount of gas left for the transaction.
                        1, // Address of `ecrecover`.
                        0x00, // Start of input.
                        0x80, // Size of input.
                        0x01, // Start of output.
                        0x20 // Size of output.
                    )
                )
            // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
            if iszero(returndatasize()) {
                mstore(0x00, 0x8baa579f) // `InvalidSignature()`.
                revert(0x1c, 0x04)
            }
            mstore(0x60, 0) // Restore the zero slot.
            mstore(0x40, m) // Restore the free memory pointer.
        }
    }
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                   TRY-RECOVER OPERATIONS                   */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    // WARNING!
    // These functions will NOT revert upon recovery failure.
    // Instead, they will return the zero address upon recovery failure.
    // It is critical that the returned address is NEVER compared against
    // a zero address (e.g. an uninitialized address variable).
    /// @dev Recovers the signer's address from a message digest `hash`, and the `signature`.
    function tryRecover(bytes32 hash, bytes memory signature)
        internal
        view
        returns (address result)
    {
        /// @solidity memory-safe-assembly
        assembly {
            result := 1
            let m := mload(0x40) // Cache the free memory pointer.
            for {} 1 {} {
                mstore(0x00, hash)
                mstore(0x40, mload(add(signature, 0x20))) // `r`.
                if eq(mload(signature), 64) {
                    let vs := mload(add(signature, 0x40))
                    mstore(0x20, add(shr(255, vs), 27)) // `v`.
                    mstore(0x60, shr(1, shl(1, vs))) // `s`.
                    break
                }
                if eq(mload(signature), 65) {
                    mstore(0x20, byte(0, mload(add(signature, 0x60)))) // `v`.
                    mstore(0x60, mload(add(signature, 0x40))) // `s`.
                    break
                }
                result := 0
                break
            }
            pop(
                staticcall(
                    gas(), // Amount of gas left for the transaction.
                    result, // Address of `ecrecover`.
                    0x00, // Start of input.
                    0x80, // Size of input.
                    0x40, // Start of output.
                    0x20 // Size of output.
                )
            )
            mstore(0x60, 0) // Restore the zero slot.
            // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
            result := mload(xor(0x60, returndatasize()))
            mstore(0x40, m) // Restore the free memory pointer.
        }
    }
    /// @dev Recovers the signer's address from a message digest `hash`, and the `signature`.
    function tryRecoverCalldata(bytes32 hash, bytes calldata signature)
        internal
        view
        returns (address result)
    {
        /// @solidity memory-safe-assembly
        assembly {
            result := 1
            let m := mload(0x40) // Cache the free memory pointer.
            mstore(0x00, hash)
            for {} 1 {} {
                if eq(signature.length, 64) {
                    let vs := calldataload(add(signature.offset, 0x20))
                    mstore(0x20, add(shr(255, vs), 27)) // `v`.
                    mstore(0x40, calldataload(signature.offset)) // `r`.
                    mstore(0x60, shr(1, shl(1, vs))) // `s`.
                    break
                }
                if eq(signature.length, 65) {
                    mstore(0x20, byte(0, calldataload(add(signature.offset, 0x40)))) // `v`.
                    calldatacopy(0x40, signature.offset, 0x40) // Copy `r` and `s`.
                    break
                }
                result := 0
                break
            }
            pop(
                staticcall(
                    gas(), // Amount of gas left for the transaction.
                    result, // Address of `ecrecover`.
                    0x00, // Start of input.
                    0x80, // Size of input.
                    0x40, // Start of output.
                    0x20 // Size of output.
                )
            )
            mstore(0x60, 0) // Restore the zero slot.
            // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
            result := mload(xor(0x60, returndatasize()))
            mstore(0x40, m) // Restore the free memory pointer.
        }
    }
    /// @dev Recovers the signer's address from a message digest `hash`,
    /// and the EIP-2098 short form signature defined by `r` and `vs`.
    function tryRecover(bytes32 hash, bytes32 r, bytes32 vs)
        internal
        view
        returns (address result)
    {
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40) // Cache the free memory pointer.
            mstore(0x00, hash)
            mstore(0x20, add(shr(255, vs), 27)) // `v`.
            mstore(0x40, r)
            mstore(0x60, shr(1, shl(1, vs))) // `s`.
            pop(
                staticcall(
                    gas(), // Amount of gas left for the transaction.
                    1, // Address of `ecrecover`.
                    0x00, // Start of input.
                    0x80, // Size of input.
                    0x40, // Start of output.
                    0x20 // Size of output.
                )
            )
            mstore(0x60, 0) // Restore the zero slot.
            // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
            result := mload(xor(0x60, returndatasize()))
            mstore(0x40, m) // Restore the free memory pointer.
        }
    }
    /// @dev Recovers the signer's address from a message digest `hash`,
    /// and the signature defined by `v`, `r`, `s`.
    function tryRecover(bytes32 hash, uint8 v, bytes32 r, bytes32 s)
        internal
        view
        returns (address result)
    {
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40) // Cache the free memory pointer.
            mstore(0x00, hash)
            mstore(0x20, and(v, 0xff))
            mstore(0x40, r)
            mstore(0x60, s)
            pop(
                staticcall(
                    gas(), // Amount of gas left for the transaction.
                    1, // Address of `ecrecover`.
                    0x00, // Start of input.
                    0x80, // Size of input.
                    0x40, // Start of output.
                    0x20 // Size of output.
                )
            )
            mstore(0x60, 0) // Restore the zero slot.
            // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
            result := mload(xor(0x60, returndatasize()))
            mstore(0x40, m) // Restore the free memory pointer.
        }
    }
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                     HASHING OPERATIONS                     */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev Returns an Ethereum Signed Message, created from a `hash`.
    /// This produces a hash corresponding to the one signed with the
    /// [`eth_sign`](https://eth.wiki/json-rpc/API#eth_sign)
    /// JSON-RPC method as part of EIP-191.
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32 result) {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x20, hash) // Store into scratch space for keccak256.
            mstore(0x00, "\\x00\\x00\\x00\\x00\\x19Ethereum Signed Message:\
32") // 28 bytes.
            result := keccak256(0x04, 0x3c) // `32 * 2 - (32 - 28) = 60 = 0x3c`.
        }
    }
    /// @dev Returns an Ethereum Signed Message, created from `s`.
    /// This produces a hash corresponding to the one signed with the
    /// [`eth_sign`](https://eth.wiki/json-rpc/API#eth_sign)
    /// JSON-RPC method as part of EIP-191.
    /// Note: Supports lengths of `s` up to 999999 bytes.
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32 result) {
        /// @solidity memory-safe-assembly
        assembly {
            let sLength := mload(s)
            let o := 0x20
            mstore(o, "\\x19Ethereum Signed Message:\
") // 26 bytes, zero-right-padded.
            mstore(0x00, 0x00)
            // Convert the `s.length` to ASCII decimal representation: `base10(s.length)`.
            for { let temp := sLength } 1 {} {
                o := sub(o, 1)
                mstore8(o, add(48, mod(temp, 10)))
                temp := div(temp, 10)
                if iszero(temp) { break }
            }
            let n := sub(0x3a, o) // Header length: `26 + 32 - o`.
            // Throw an out-of-offset error (consumes all gas) if the header exceeds 32 bytes.
            returndatacopy(returndatasize(), returndatasize(), gt(n, 0x20))
            mstore(s, or(mload(0x00), mload(n))) // Temporarily store the header.
            result := keccak256(add(s, sub(0x20, n)), add(n, sLength))
            mstore(s, sLength) // Restore the length.
        }
    }
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                   EMPTY CALLDATA HELPERS                   */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev Returns an empty calldata bytes.
    function emptySignature() internal pure returns (bytes calldata signature) {
        /// @solidity memory-safe-assembly
        assembly {
            signature.length := 0
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;
/// @notice Contract for EIP-712 typed structured data hashing and signing.
/// @author Solady (https://github.com/vectorized/solady/blob/main/src/utils/EIP712.sol)
/// @author Modified from Solbase (https://github.com/Sol-DAO/solbase/blob/main/src/utils/EIP712.sol)
/// @author Modified from OpenZeppelin (https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/cryptography/EIP712.sol)
///
/// @dev Note, this implementation:
/// - Uses `address(this)` for the `verifyingContract` field.
/// - Does NOT use the optional EIP-712 salt.
/// - Does NOT use any EIP-712 extensions.
/// This is for simplicity and to save gas.
/// If you need to customize, please fork / modify accordingly.
abstract contract EIP712 {
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                  CONSTANTS AND IMMUTABLES                  */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev `keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)")`.
    bytes32 internal constant _DOMAIN_TYPEHASH =
        0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f;
    uint256 private immutable _cachedThis;
    uint256 private immutable _cachedChainId;
    bytes32 private immutable _cachedNameHash;
    bytes32 private immutable _cachedVersionHash;
    bytes32 private immutable _cachedDomainSeparator;
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                        CONSTRUCTOR                         */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev Cache the hashes for cheaper runtime gas costs.
    /// In the case of upgradeable contracts (i.e. proxies),
    /// or if the chain id changes due to a hard fork,
    /// the domain separator will be seamlessly calculated on-the-fly.
    constructor() {
        _cachedThis = uint256(uint160(address(this)));
        _cachedChainId = block.chainid;
        string memory name;
        string memory version;
        if (!_domainNameAndVersionMayChange()) (name, version) = _domainNameAndVersion();
        bytes32 nameHash = _domainNameAndVersionMayChange() ? bytes32(0) : keccak256(bytes(name));
        bytes32 versionHash =
            _domainNameAndVersionMayChange() ? bytes32(0) : keccak256(bytes(version));
        _cachedNameHash = nameHash;
        _cachedVersionHash = versionHash;
        bytes32 separator;
        if (!_domainNameAndVersionMayChange()) {
            /// @solidity memory-safe-assembly
            assembly {
                let m := mload(0x40) // Load the free memory pointer.
                mstore(m, _DOMAIN_TYPEHASH)
                mstore(add(m, 0x20), nameHash)
                mstore(add(m, 0x40), versionHash)
                mstore(add(m, 0x60), chainid())
                mstore(add(m, 0x80), address())
                separator := keccak256(m, 0xa0)
            }
        }
        _cachedDomainSeparator = separator;
    }
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                   FUNCTIONS TO OVERRIDE                    */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev Please override this function to return the domain name and version.
    /// ```
    ///     function _domainNameAndVersion()
    ///         internal
    ///         pure
    ///         virtual
    ///         returns (string memory name, string memory version)
    ///     {
    ///         name = "Solady";
    ///         version = "1";
    ///     }
    /// ```
    ///
    /// Note: If the returned result may change after the contract has been deployed,
    /// you must override `_domainNameAndVersionMayChange()` to return true.
    function _domainNameAndVersion()
        internal
        view
        virtual
        returns (string memory name, string memory version);
    /// @dev Returns if `_domainNameAndVersion()` may change
    /// after the contract has been deployed (i.e. after the constructor).
    /// Default: false.
    function _domainNameAndVersionMayChange() internal pure virtual returns (bool result) {}
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                     HASHING OPERATIONS                     */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev Returns the EIP-712 domain separator.
    function _domainSeparator() internal view virtual returns (bytes32 separator) {
        if (_domainNameAndVersionMayChange()) {
            separator = _buildDomainSeparator();
        } else {
            separator = _cachedDomainSeparator;
            if (_cachedDomainSeparatorInvalidated()) separator = _buildDomainSeparator();
        }
    }
    /// @dev Returns the hash of the fully encoded EIP-712 message for this domain,
    /// given `structHash`, as defined in
    /// https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct.
    ///
    /// The hash can be used together with {ECDSA-recover} to obtain the signer of a message:
    /// ```
    ///     bytes32 digest = _hashTypedData(keccak256(abi.encode(
    ///         keccak256("Mail(address to,string contents)"),
    ///         mailTo,
    ///         keccak256(bytes(mailContents))
    ///     )));
    ///     address signer = ECDSA.recover(digest, signature);
    /// ```
    function _hashTypedData(bytes32 structHash) internal view virtual returns (bytes32 digest) {
        // We will use `digest` to store the domain separator to save a bit of gas.
        if (_domainNameAndVersionMayChange()) {
            digest = _buildDomainSeparator();
        } else {
            digest = _cachedDomainSeparator;
            if (_cachedDomainSeparatorInvalidated()) digest = _buildDomainSeparator();
        }
        /// @solidity memory-safe-assembly
        assembly {
            // Compute the digest.
            mstore(0x00, 0x1901000000000000) // Store "\\x19\\x01".
            mstore(0x1a, digest) // Store the domain separator.
            mstore(0x3a, structHash) // Store the struct hash.
            digest := keccak256(0x18, 0x42)
            // Restore the part of the free memory slot that was overwritten.
            mstore(0x3a, 0)
        }
    }
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                    EIP-5267 OPERATIONS                     */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev See: https://eips.ethereum.org/EIPS/eip-5267
    function eip712Domain()
        public
        view
        virtual
        returns (
            bytes1 fields,
            string memory name,
            string memory version,
            uint256 chainId,
            address verifyingContract,
            bytes32 salt,
            uint256[] memory extensions
        )
    {
        fields = hex"0f"; // `0b01111`.
        (name, version) = _domainNameAndVersion();
        chainId = block.chainid;
        verifyingContract = address(this);
        salt = salt; // `bytes32(0)`.
        extensions = extensions; // `new uint256[](0)`.
    }
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                      PRIVATE HELPERS                       */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev Returns the EIP-712 domain separator.
    function _buildDomainSeparator() private view returns (bytes32 separator) {
        // We will use `separator` to store the name hash to save a bit of gas.
        bytes32 versionHash;
        if (_domainNameAndVersionMayChange()) {
            (string memory name, string memory version) = _domainNameAndVersion();
            separator = keccak256(bytes(name));
            versionHash = keccak256(bytes(version));
        } else {
            separator = _cachedNameHash;
            versionHash = _cachedVersionHash;
        }
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40) // Load the free memory pointer.
            mstore(m, _DOMAIN_TYPEHASH)
            mstore(add(m, 0x20), separator) // Name hash.
            mstore(add(m, 0x40), versionHash)
            mstore(add(m, 0x60), chainid())
            mstore(add(m, 0x80), address())
            separator := keccak256(m, 0xa0)
        }
    }
    /// @dev Returns if the cached domain separator has been invalidated.
    function _cachedDomainSeparatorInvalidated() private view returns (bool result) {
        uint256 cachedChainId = _cachedChainId;
        uint256 cachedThis = _cachedThis;
        /// @solidity memory-safe-assembly
        assembly {
            result := iszero(and(eq(chainid(), cachedChainId), eq(address(), cachedThis)))
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;
/// @notice Safe ETH and ERC20 transfer library that gracefully handles missing return values.
/// @author Solady (https://github.com/vectorized/solady/blob/main/src/utils/SafeTransferLib.sol)
/// @author Modified from Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/SafeTransferLib.sol)
///
/// @dev Note:
/// - For ETH transfers, please use `forceSafeTransferETH` for DoS protection.
/// - For ERC20s, this implementation won't check that a token has code,
///   responsibility is delegated to the caller.
library SafeTransferLib {
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                       CUSTOM ERRORS                        */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev The ETH transfer has failed.
    error ETHTransferFailed();
    /// @dev The ERC20 `transferFrom` has failed.
    error TransferFromFailed();
    /// @dev The ERC20 `transfer` has failed.
    error TransferFailed();
    /// @dev The ERC20 `approve` has failed.
    error ApproveFailed();
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                         CONSTANTS                          */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev Suggested gas stipend for contract receiving ETH that disallows any storage writes.
    uint256 internal constant GAS_STIPEND_NO_STORAGE_WRITES = 2300;
    /// @dev Suggested gas stipend for contract receiving ETH to perform a few
    /// storage reads and writes, but low enough to prevent griefing.
    uint256 internal constant GAS_STIPEND_NO_GRIEF = 100000;
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                       ETH OPERATIONS                       */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    // If the ETH transfer MUST succeed with a reasonable gas budget, use the force variants.
    //
    // The regular variants:
    // - Forwards all remaining gas to the target.
    // - Reverts if the target reverts.
    // - Reverts if the current contract has insufficient balance.
    //
    // The force variants:
    // - Forwards with an optional gas stipend
    //   (defaults to `GAS_STIPEND_NO_GRIEF`, which is sufficient for most cases).
    // - If the target reverts, or if the gas stipend is exhausted,
    //   creates a temporary contract to force send the ETH via `SELFDESTRUCT`.
    //   Future compatible with `SENDALL`: https://eips.ethereum.org/EIPS/eip-4758.
    // - Reverts if the current contract has insufficient balance.
    //
    // The try variants:
    // - Forwards with a mandatory gas stipend.
    // - Instead of reverting, returns whether the transfer succeeded.
    /// @dev Sends `amount` (in wei) ETH to `to`.
    function safeTransferETH(address to, uint256 amount) internal {
        /// @solidity memory-safe-assembly
        assembly {
            if iszero(call(gas(), to, amount, codesize(), 0x00, codesize(), 0x00)) {
                mstore(0x00, 0xb12d13eb) // `ETHTransferFailed()`.
                revert(0x1c, 0x04)
            }
        }
    }
    /// @dev Sends all the ETH in the current contract to `to`.
    function safeTransferAllETH(address to) internal {
        /// @solidity memory-safe-assembly
        assembly {
            // Transfer all the ETH and check if it succeeded or not.
            if iszero(call(gas(), to, selfbalance(), codesize(), 0x00, codesize(), 0x00)) {
                mstore(0x00, 0xb12d13eb) // `ETHTransferFailed()`.
                revert(0x1c, 0x04)
            }
        }
    }
    /// @dev Force sends `amount` (in wei) ETH to `to`, with a `gasStipend`.
    function forceSafeTransferETH(address to, uint256 amount, uint256 gasStipend) internal {
        /// @solidity memory-safe-assembly
        assembly {
            if lt(selfbalance(), amount) {
                mstore(0x00, 0xb12d13eb) // `ETHTransferFailed()`.
                revert(0x1c, 0x04)
            }
            if iszero(call(gasStipend, to, amount, codesize(), 0x00, codesize(), 0x00)) {
                mstore(0x00, to) // Store the address in scratch space.
                mstore8(0x0b, 0x73) // Opcode `PUSH20`.
                mstore8(0x20, 0xff) // Opcode `SELFDESTRUCT`.
                if iszero(create(amount, 0x0b, 0x16)) { revert(codesize(), codesize()) } // For gas estimation.
            }
        }
    }
    /// @dev Force sends all the ETH in the current contract to `to`, with a `gasStipend`.
    function forceSafeTransferAllETH(address to, uint256 gasStipend) internal {
        /// @solidity memory-safe-assembly
        assembly {
            if iszero(call(gasStipend, to, selfbalance(), codesize(), 0x00, codesize(), 0x00)) {
                mstore(0x00, to) // Store the address in scratch space.
                mstore8(0x0b, 0x73) // Opcode `PUSH20`.
                mstore8(0x20, 0xff) // Opcode `SELFDESTRUCT`.
                if iszero(create(selfbalance(), 0x0b, 0x16)) { revert(codesize(), codesize()) } // For gas estimation.
            }
        }
    }
    /// @dev Force sends `amount` (in wei) ETH to `to`, with `GAS_STIPEND_NO_GRIEF`.
    function forceSafeTransferETH(address to, uint256 amount) internal {
        /// @solidity memory-safe-assembly
        assembly {
            if lt(selfbalance(), amount) {
                mstore(0x00, 0xb12d13eb) // `ETHTransferFailed()`.
                revert(0x1c, 0x04)
            }
            if iszero(call(GAS_STIPEND_NO_GRIEF, to, amount, codesize(), 0x00, codesize(), 0x00)) {
                mstore(0x00, to) // Store the address in scratch space.
                mstore8(0x0b, 0x73) // Opcode `PUSH20`.
                mstore8(0x20, 0xff) // Opcode `SELFDESTRUCT`.
                if iszero(create(amount, 0x0b, 0x16)) { revert(codesize(), codesize()) } // For gas estimation.
            }
        }
    }
    /// @dev Force sends all the ETH in the current contract to `to`, with `GAS_STIPEND_NO_GRIEF`.
    function forceSafeTransferAllETH(address to) internal {
        /// @solidity memory-safe-assembly
        assembly {
            // forgefmt: disable-next-item
            if iszero(call(GAS_STIPEND_NO_GRIEF, to, selfbalance(), codesize(), 0x00, codesize(), 0x00)) {
                mstore(0x00, to) // Store the address in scratch space.
                mstore8(0x0b, 0x73) // Opcode `PUSH20`.
                mstore8(0x20, 0xff) // Opcode `SELFDESTRUCT`.
                if iszero(create(selfbalance(), 0x0b, 0x16)) { revert(codesize(), codesize()) } // For gas estimation.
            }
        }
    }
    /// @dev Sends `amount` (in wei) ETH to `to`, with a `gasStipend`.
    function trySafeTransferETH(address to, uint256 amount, uint256 gasStipend)
        internal
        returns (bool success)
    {
        /// @solidity memory-safe-assembly
        assembly {
            success := call(gasStipend, to, amount, codesize(), 0x00, codesize(), 0x00)
        }
    }
    /// @dev Sends all the ETH in the current contract to `to`, with a `gasStipend`.
    function trySafeTransferAllETH(address to, uint256 gasStipend)
        internal
        returns (bool success)
    {
        /// @solidity memory-safe-assembly
        assembly {
            success := call(gasStipend, to, selfbalance(), codesize(), 0x00, codesize(), 0x00)
        }
    }
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                      ERC20 OPERATIONS                      */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev Sends `amount` of ERC20 `token` from `from` to `to`.
    /// Reverts upon failure.
    ///
    /// The `from` account must have at least `amount` approved for
    /// the current contract to manage.
    function safeTransferFrom(address token, address from, address to, uint256 amount) internal {
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40) // Cache the free memory pointer.
            mstore(0x60, amount) // Store the `amount` argument.
            mstore(0x40, to) // Store the `to` argument.
            mstore(0x2c, shl(96, from)) // Store the `from` argument.
            mstore(0x0c, 0x23b872dd000000000000000000000000) // `transferFrom(address,address,uint256)`.
            // Perform the transfer, reverting upon failure.
            if iszero(
                and( // The arguments of `and` are evaluated from right to left.
                    or(eq(mload(0x00), 1), iszero(returndatasize())), // Returned 1 or nothing.
                    call(gas(), token, 0, 0x1c, 0x64, 0x00, 0x20)
                )
            ) {
                mstore(0x00, 0x7939f424) // `TransferFromFailed()`.
                revert(0x1c, 0x04)
            }
            mstore(0x60, 0) // Restore the zero slot to zero.
            mstore(0x40, m) // Restore the free memory pointer.
        }
    }
    /// @dev Sends all of ERC20 `token` from `from` to `to`.
    /// Reverts upon failure.
    ///
    /// The `from` account must have their entire balance approved for
    /// the current contract to manage.
    function safeTransferAllFrom(address token, address from, address to)
        internal
        returns (uint256 amount)
    {
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40) // Cache the free memory pointer.
            mstore(0x40, to) // Store the `to` argument.
            mstore(0x2c, shl(96, from)) // Store the `from` argument.
            mstore(0x0c, 0x70a08231000000000000000000000000) // `balanceOf(address)`.
            // Read the balance, reverting upon failure.
            if iszero(
                and( // The arguments of `and` are evaluated from right to left.
                    gt(returndatasize(), 0x1f), // At least 32 bytes returned.
                    staticcall(gas(), token, 0x1c, 0x24, 0x60, 0x20)
                )
            ) {
                mstore(0x00, 0x7939f424) // `TransferFromFailed()`.
                revert(0x1c, 0x04)
            }
            mstore(0x00, 0x23b872dd) // `transferFrom(address,address,uint256)`.
            amount := mload(0x60) // The `amount` is already at 0x60. We'll need to return it.
            // Perform the transfer, reverting upon failure.
            if iszero(
                and( // The arguments of `and` are evaluated from right to left.
                    or(eq(mload(0x00), 1), iszero(returndatasize())), // Returned 1 or nothing.
                    call(gas(), token, 0, 0x1c, 0x64, 0x00, 0x20)
                )
            ) {
                mstore(0x00, 0x7939f424) // `TransferFromFailed()`.
                revert(0x1c, 0x04)
            }
            mstore(0x60, 0) // Restore the zero slot to zero.
            mstore(0x40, m) // Restore the free memory pointer.
        }
    }
    /// @dev Sends `amount` of ERC20 `token` from the current contract to `to`.
    /// Reverts upon failure.
    function safeTransfer(address token, address to, uint256 amount) internal {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x14, to) // Store the `to` argument.
            mstore(0x34, amount) // Store the `amount` argument.
            mstore(0x00, 0xa9059cbb000000000000000000000000) // `transfer(address,uint256)`.
            // Perform the transfer, reverting upon failure.
            if iszero(
                and( // The arguments of `and` are evaluated from right to left.
                    or(eq(mload(0x00), 1), iszero(returndatasize())), // Returned 1 or nothing.
                    call(gas(), token, 0, 0x10, 0x44, 0x00, 0x20)
                )
            ) {
                mstore(0x00, 0x90b8ec18) // `TransferFailed()`.
                revert(0x1c, 0x04)
            }
            mstore(0x34, 0) // Restore the part of the free memory pointer that was overwritten.
        }
    }
    /// @dev Sends all of ERC20 `token` from the current contract to `to`.
    /// Reverts upon failure.
    function safeTransferAll(address token, address to) internal returns (uint256 amount) {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x00, 0x70a08231) // Store the function selector of `balanceOf(address)`.
            mstore(0x20, address()) // Store the address of the current contract.
            // Read the balance, reverting upon failure.
            if iszero(
                and( // The arguments of `and` are evaluated from right to left.
                    gt(returndatasize(), 0x1f), // At least 32 bytes returned.
                    staticcall(gas(), token, 0x1c, 0x24, 0x34, 0x20)
                )
            ) {
                mstore(0x00, 0x90b8ec18) // `TransferFailed()`.
                revert(0x1c, 0x04)
            }
            mstore(0x14, to) // Store the `to` argument.
            amount := mload(0x34) // The `amount` is already at 0x34. We'll need to return it.
            mstore(0x00, 0xa9059cbb000000000000000000000000) // `transfer(address,uint256)`.
            // Perform the transfer, reverting upon failure.
            if iszero(
                and( // The arguments of `and` are evaluated from right to left.
                    or(eq(mload(0x00), 1), iszero(returndatasize())), // Returned 1 or nothing.
                    call(gas(), token, 0, 0x10, 0x44, 0x00, 0x20)
                )
            ) {
                mstore(0x00, 0x90b8ec18) // `TransferFailed()`.
                revert(0x1c, 0x04)
            }
            mstore(0x34, 0) // Restore the part of the free memory pointer that was overwritten.
        }
    }
    /// @dev Sets `amount` of ERC20 `token` for `to` to manage on behalf of the current contract.
    /// Reverts upon failure.
    function safeApprove(address token, address to, uint256 amount) internal {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x14, to) // Store the `to` argument.
            mstore(0x34, amount) // Store the `amount` argument.
            mstore(0x00, 0x095ea7b3000000000000000000000000) // `approve(address,uint256)`.
            // Perform the approval, reverting upon failure.
            if iszero(
                and( // The arguments of `and` are evaluated from right to left.
                    or(eq(mload(0x00), 1), iszero(returndatasize())), // Returned 1 or nothing.
                    call(gas(), token, 0, 0x10, 0x44, 0x00, 0x20)
                )
            ) {
                mstore(0x00, 0x3e3f8f73) // `ApproveFailed()`.
                revert(0x1c, 0x04)
            }
            mstore(0x34, 0) // Restore the part of the free memory pointer that was overwritten.
        }
    }
    /// @dev Sets `amount` of ERC20 `token` for `to` to manage on behalf of the current contract.
    /// If the initial attempt to approve fails, attempts to reset the approved amount to zero,
    /// then retries the approval again (some tokens, e.g. USDT, requires this).
    /// Reverts upon failure.
    function safeApproveWithRetry(address token, address to, uint256 amount) internal {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x14, to) // Store the `to` argument.
            mstore(0x34, amount) // Store the `amount` argument.
            mstore(0x00, 0x095ea7b3000000000000000000000000) // `approve(address,uint256)`.
            // Perform the approval, retrying upon failure.
            if iszero(
                and( // The arguments of `and` are evaluated from right to left.
                    or(eq(mload(0x00), 1), iszero(returndatasize())), // Returned 1 or nothing.
                    call(gas(), token, 0, 0x10, 0x44, 0x00, 0x20)
                )
            ) {
                mstore(0x34, 0) // Store 0 for the `amount`.
                mstore(0x00, 0x095ea7b3000000000000000000000000) // `approve(address,uint256)`.
                pop(call(gas(), token, 0, 0x10, 0x44, codesize(), 0x00)) // Reset the approval.
                mstore(0x34, amount) // Store back the original `amount`.
                // Retry the approval, reverting upon failure.
                if iszero(
                    and(
                        or(eq(mload(0x00), 1), iszero(returndatasize())), // Returned 1 or nothing.
                        call(gas(), token, 0, 0x10, 0x44, 0x00, 0x20)
                    )
                ) {
                    mstore(0x00, 0x3e3f8f73) // `ApproveFailed()`.
                    revert(0x1c, 0x04)
                }
            }
            mstore(0x34, 0) // Restore the part of the free memory pointer that was overwritten.
        }
    }
    /// @dev Returns the amount of ERC20 `token` owned by `account`.
    /// Returns zero if the `token` does not exist.
    function balanceOf(address token, address account) internal view returns (uint256 amount) {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x14, account) // Store the `account` argument.
            mstore(0x00, 0x70a08231000000000000000000000000) // `balanceOf(address)`.
            amount :=
                mul(
                    mload(0x20),
                    and( // The arguments of `and` are evaluated from right to left.
                        gt(returndatasize(), 0x1f), // At least 32 bytes returned.
                        staticcall(gas(), token, 0x10, 0x24, 0x20, 0x20)
                    )
                )
        }
    }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;
/// @notice Signature verification helper that supports both ECDSA signatures from EOAs
/// and ERC1271 signatures from smart contract wallets like Argent and Gnosis safe.
/// @author Solady (https://github.com/vectorized/solady/blob/main/src/utils/SignatureCheckerLib.sol)
/// @author Modified from OpenZeppelin (https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/cryptography/SignatureChecker.sol)
///
/// @dev Note:
/// - The signature checking functions use the ecrecover precompile (0x1).
/// - The `bytes memory signature` variants use the identity precompile (0x4)
///   to copy memory internally.
/// - Unlike ECDSA signatures, contract signatures are revocable.
/// - As of Solady version 0.0.134, all `bytes signature` variants accept both
///   regular 65-byte `(r, s, v)` and EIP-2098 `(r, vs)` short form signatures.
///   See: https://eips.ethereum.org/EIPS/eip-2098
///   This is for calldata efficiency on smart accounts prevalent on L2s.
///
/// WARNING! Do NOT use signatures as unique identifiers:
/// - Use a nonce in the digest to prevent replay attacks on the same contract.
/// - Use EIP-712 for the digest to prevent replay attacks across different chains and contracts.
///   EIP-712 also enables readable signing of typed data for better user safety.
/// This implementation does NOT check if a signature is non-malleable.
library SignatureCheckerLib {
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*               SIGNATURE CHECKING OPERATIONS                */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev Returns whether `signature` is valid for `signer` and `hash`.
    /// If `signer` is a smart contract, the signature is validated with ERC1271.
    /// Otherwise, the signature is validated with `ECDSA.recover`.
    function isValidSignatureNow(address signer, bytes32 hash, bytes memory signature)
        internal
        view
        returns (bool isValid)
    {
        /// @solidity memory-safe-assembly
        assembly {
            // Clean the upper 96 bits of `signer` in case they are dirty.
            for { signer := shr(96, shl(96, signer)) } signer {} {
                let m := mload(0x40)
                mstore(0x00, hash)
                mstore(0x40, mload(add(signature, 0x20))) // `r`.
                if eq(mload(signature), 64) {
                    let vs := mload(add(signature, 0x40))
                    mstore(0x20, add(shr(255, vs), 27)) // `v`.
                    mstore(0x60, shr(1, shl(1, vs))) // `s`.
                    let t :=
                        staticcall(
                            gas(), // Amount of gas left for the transaction.
                            1, // Address of `ecrecover`.
                            0x00, // Start of input.
                            0x80, // Size of input.
                            0x01, // Start of output.
                            0x20 // Size of output.
                        )
                    // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
                    if iszero(or(iszero(returndatasize()), xor(signer, mload(t)))) {
                        isValid := 1
                        mstore(0x60, 0) // Restore the zero slot.
                        mstore(0x40, m) // Restore the free memory pointer.
                        break
                    }
                }
                if eq(mload(signature), 65) {
                    mstore(0x20, byte(0, mload(add(signature, 0x60)))) // `v`.
                    mstore(0x60, mload(add(signature, 0x40))) // `s`.
                    let t :=
                        staticcall(
                            gas(), // Amount of gas left for the transaction.
                            1, // Address of `ecrecover`.
                            0x00, // Start of input.
                            0x80, // Size of input.
                            0x01, // Start of output.
                            0x20 // Size of output.
                        )
                    // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
                    if iszero(or(iszero(returndatasize()), xor(signer, mload(t)))) {
                        isValid := 1
                        mstore(0x60, 0) // Restore the zero slot.
                        mstore(0x40, m) // Restore the free memory pointer.
                        break
                    }
                }
                mstore(0x60, 0) // Restore the zero slot.
                mstore(0x40, m) // Restore the free memory pointer.
                let f := shl(224, 0x1626ba7e)
                mstore(m, f) // `bytes4(keccak256("isValidSignature(bytes32,bytes)"))`.
                mstore(add(m, 0x04), hash)
                let d := add(m, 0x24)
                mstore(d, 0x40) // The offset of the `signature` in the calldata.
                // Copy the `signature` over.
                let n := add(0x20, mload(signature))
                pop(staticcall(gas(), 4, signature, n, add(m, 0x44), n))
                // forgefmt: disable-next-item
                isValid := and(
                    // Whether the returndata is the magic value `0x1626ba7e` (left-aligned).
                    eq(mload(d), f),
                    // Whether the staticcall does not revert.
                    // This must be placed at the end of the `and` clause,
                    // as the arguments are evaluated from right to left.
                    staticcall(
                        gas(), // Remaining gas.
                        signer, // The `signer` address.
                        m, // Offset of calldata in memory.
                        add(returndatasize(), 0x44), // Length of calldata in memory.
                        d, // Offset of returndata.
                        0x20 // Length of returndata to write.
                    )
                )
                break
            }
        }
    }
    /// @dev Returns whether `signature` is valid for `signer` and `hash`.
    /// If `signer` is a smart contract, the signature is validated with ERC1271.
    /// Otherwise, the signature is validated with `ECDSA.recover`.
    function isValidSignatureNowCalldata(address signer, bytes32 hash, bytes calldata signature)
        internal
        view
        returns (bool isValid)
    {
        /// @solidity memory-safe-assembly
        assembly {
            // Clean the upper 96 bits of `signer` in case they are dirty.
            for { signer := shr(96, shl(96, signer)) } signer {} {
                let m := mload(0x40)
                mstore(0x00, hash)
                if eq(signature.length, 64) {
                    let vs := calldataload(add(signature.offset, 0x20))
                    mstore(0x20, add(shr(255, vs), 27)) // `v`.
                    mstore(0x40, calldataload(signature.offset)) // `r`.
                    mstore(0x60, shr(1, shl(1, vs))) // `s`.
                    let t :=
                        staticcall(
                            gas(), // Amount of gas left for the transaction.
                            1, // Address of `ecrecover`.
                            0x00, // Start of input.
                            0x80, // Size of input.
                            0x01, // Start of output.
                            0x20 // Size of output.
                        )
                    // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
                    if iszero(or(iszero(returndatasize()), xor(signer, mload(t)))) {
                        isValid := 1
                        mstore(0x60, 0) // Restore the zero slot.
                        mstore(0x40, m) // Restore the free memory pointer.
                        break
                    }
                }
                if eq(signature.length, 65) {
                    mstore(0x20, byte(0, calldataload(add(signature.offset, 0x40)))) // `v`.
                    calldatacopy(0x40, signature.offset, 0x40) // `r`, `s`.
                    let t :=
                        staticcall(
                            gas(), // Amount of gas left for the transaction.
                            1, // Address of `ecrecover`.
                            0x00, // Start of input.
                            0x80, // Size of input.
                            0x01, // Start of output.
                            0x20 // Size of output.
                        )
                    // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
                    if iszero(or(iszero(returndatasize()), xor(signer, mload(t)))) {
                        isValid := 1
                        mstore(0x60, 0) // Restore the zero slot.
                        mstore(0x40, m) // Restore the free memory pointer.
                        break
                    }
                }
                mstore(0x60, 0) // Restore the zero slot.
                mstore(0x40, m) // Restore the free memory pointer.
                let f := shl(224, 0x1626ba7e)
                mstore(m, f) // `bytes4(keccak256("isValidSignature(bytes32,bytes)"))`.
                mstore(add(m, 0x04), hash)
                let d := add(m, 0x24)
                mstore(d, 0x40) // The offset of the `signature` in the calldata.
                mstore(add(m, 0x44), signature.length)
                // Copy the `signature` over.
                calldatacopy(add(m, 0x64), signature.offset, signature.length)
                // forgefmt: disable-next-item
                isValid := and(
                    // Whether the returndata is the magic value `0x1626ba7e` (left-aligned).
                    eq(mload(d), f),
                    // Whether the staticcall does not revert.
                    // This must be placed at the end of the `and` clause,
                    // as the arguments are evaluated from right to left.
                    staticcall(
                        gas(), // Remaining gas.
                        signer, // The `signer` address.
                        m, // Offset of calldata in memory.
                        add(signature.length, 0x64), // Length of calldata in memory.
                        d, // Offset of returndata.
                        0x20 // Length of returndata to write.
                    )
                )
                break
            }
        }
    }
    /// @dev Returns whether the signature (`r`, `vs`) is valid for `signer` and `hash`.
    /// If `signer` is a smart contract, the signature is validated with ERC1271.
    /// Otherwise, the signature is validated with `ECDSA.recover`.
    function isValidSignatureNow(address signer, bytes32 hash, bytes32 r, bytes32 vs)
        internal
        view
        returns (bool isValid)
    {
        /// @solidity memory-safe-assembly
        assembly {
            // Clean the upper 96 bits of `signer` in case they are dirty.
            for { signer := shr(96, shl(96, signer)) } signer {} {
                let m := mload(0x40)
                mstore(0x00, hash)
                mstore(0x20, add(shr(255, vs), 27)) // `v`.
                mstore(0x40, r) // `r`.
                mstore(0x60, shr(1, shl(1, vs))) // `s`.
                let t :=
                    staticcall(
                        gas(), // Amount of gas left for the transaction.
                        1, // Address of `ecrecover`.
                        0x00, // Start of input.
                        0x80, // Size of input.
                        0x01, // Start of output.
                        0x20 // Size of output.
                    )
                // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
                if iszero(or(iszero(returndatasize()), xor(signer, mload(t)))) {
                    isValid := 1
                    mstore(0x60, 0) // Restore the zero slot.
                    mstore(0x40, m) // Restore the free memory pointer.
                    break
                }
                let f := shl(224, 0x1626ba7e)
                mstore(m, f) // `bytes4(keccak256("isValidSignature(bytes32,bytes)"))`.
                mstore(add(m, 0x04), hash)
                let d := add(m, 0x24)
                mstore(d, 0x40) // The offset of the `signature` in the calldata.
                mstore(add(m, 0x44), 65) // Length of the signature.
                mstore(add(m, 0x64), r) // `r`.
                mstore(add(m, 0x84), mload(0x60)) // `s`.
                mstore8(add(m, 0xa4), mload(0x20)) // `v`.
                // forgefmt: disable-next-item
                isValid := and(
                    // Whether the returndata is the magic value `0x1626ba7e` (left-aligned).
                    eq(mload(d), f),
                    // Whether the staticcall does not revert.
                    // This must be placed at the end of the `and` clause,
                    // as the arguments are evaluated from right to left.
                    staticcall(
                        gas(), // Remaining gas.
                        signer, // The `signer` address.
                        m, // Offset of calldata in memory.
                        0xa5, // Length of calldata in memory.
                        d, // Offset of returndata.
                        0x20 // Length of returndata to write.
                    )
                )
                mstore(0x60, 0) // Restore the zero slot.
                mstore(0x40, m) // Restore the free memory pointer.
                break
            }
        }
    }
    /// @dev Returns whether the signature (`v`, `r`, `s`) is valid for `signer` and `hash`.
    /// If `signer` is a smart contract, the signature is validated with ERC1271.
    /// Otherwise, the signature is validated with `ECDSA.recover`.
    function isValidSignatureNow(address signer, bytes32 hash, uint8 v, bytes32 r, bytes32 s)
        internal
        view
        returns (bool isValid)
    {
        /// @solidity memory-safe-assembly
        assembly {
            // Clean the upper 96 bits of `signer` in case they are dirty.
            for { signer := shr(96, shl(96, signer)) } signer {} {
                let m := mload(0x40)
                mstore(0x00, hash)
                mstore(0x20, and(v, 0xff)) // `v`.
                mstore(0x40, r) // `r`.
                mstore(0x60, s) // `s`.
                let t :=
                    staticcall(
                        gas(), // Amount of gas left for the transaction.
                        1, // Address of `ecrecover`.
                        0x00, // Start of input.
                        0x80, // Size of input.
                        0x01, // Start of output.
                        0x20 // Size of output.
                    )
                // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
                if iszero(or(iszero(returndatasize()), xor(signer, mload(t)))) {
                    isValid := 1
                    mstore(0x60, 0) // Restore the zero slot.
                    mstore(0x40, m) // Restore the free memory pointer.
                    break
                }
                let f := shl(224, 0x1626ba7e)
                mstore(m, f) // `bytes4(keccak256("isValidSignature(bytes32,bytes)"))`.
                mstore(add(m, 0x04), hash)
                let d := add(m, 0x24)
                mstore(d, 0x40) // The offset of the `signature` in the calldata.
                mstore(add(m, 0x44), 65) // Length of the signature.
                mstore(add(m, 0x64), r) // `r`.
                mstore(add(m, 0x84), s) // `s`.
                mstore8(add(m, 0xa4), v) // `v`.
                // forgefmt: disable-next-item
                isValid := and(
                    // Whether the returndata is the magic value `0x1626ba7e` (left-aligned).
                    eq(mload(d), f),
                    // Whether the staticcall does not revert.
                    // This must be placed at the end of the `and` clause,
                    // as the arguments are evaluated from right to left.
                    staticcall(
                        gas(), // Remaining gas.
                        signer, // The `signer` address.
                        m, // Offset of calldata in memory.
                        0xa5, // Length of calldata in memory.
                        d, // Offset of returndata.
                        0x20 // Length of returndata to write.
                    )
                )
                mstore(0x60, 0) // Restore the zero slot.
                mstore(0x40, m) // Restore the free memory pointer.
                break
            }
        }
    }
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                     ERC1271 OPERATIONS                     */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev Returns whether `signature` is valid for `hash` for an ERC1271 `signer` contract.
    function isValidERC1271SignatureNow(address signer, bytes32 hash, bytes memory signature)
        internal
        view
        returns (bool isValid)
    {
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40)
            let f := shl(224, 0x1626ba7e)
            mstore(m, f) // `bytes4(keccak256("isValidSignature(bytes32,bytes)"))`.
            mstore(add(m, 0x04), hash)
            let d := add(m, 0x24)
            mstore(d, 0x40) // The offset of the `signature` in the calldata.
            // Copy the `signature` over.
            let n := add(0x20, mload(signature))
            pop(staticcall(gas(), 4, signature, n, add(m, 0x44), n))
            // forgefmt: disable-next-item
            isValid := and(
                // Whether the returndata is the magic value `0x1626ba7e` (left-aligned).
                eq(mload(d), f),
                // Whether the staticcall does not revert.
                // This must be placed at the end of the `and` clause,
                // as the arguments are evaluated from right to left.
                staticcall(
                    gas(), // Remaining gas.
                    signer, // The `signer` address.
                    m, // Offset of calldata in memory.
                    add(returndatasize(), 0x44), // Length of calldata in memory.
                    d, // Offset of returndata.
                    0x20 // Length of returndata to write.
                )
            )
        }
    }
    /// @dev Returns whether `signature` is valid for `hash` for an ERC1271 `signer` contract.
    function isValidERC1271SignatureNowCalldata(
        address signer,
        bytes32 hash,
        bytes calldata signature
    ) internal view returns (bool isValid) {
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40)
            let f := shl(224, 0x1626ba7e)
            mstore(m, f) // `bytes4(keccak256("isValidSignature(bytes32,bytes)"))`.
            mstore(add(m, 0x04), hash)
            let d := add(m, 0x24)
            mstore(d, 0x40) // The offset of the `signature` in the calldata.
            mstore(add(m, 0x44), signature.length)
            // Copy the `signature` over.
            calldatacopy(add(m, 0x64), signature.offset, signature.length)
            // forgefmt: disable-next-item
            isValid := and(
                // Whether the returndata is the magic value `0x1626ba7e` (left-aligned).
                eq(mload(d), f),
                // Whether the staticcall does not revert.
                // This must be placed at the end of the `and` clause,
                // as the arguments are evaluated from right to left.
                staticcall(
                    gas(), // Remaining gas.
                    signer, // The `signer` address.
                    m, // Offset of calldata in memory.
                    add(signature.length, 0x64), // Length of calldata in memory.
                    d, // Offset of returndata.
                    0x20 // Length of returndata to write.
                )
            )
        }
    }
    /// @dev Returns whether the signature (`r`, `vs`) is valid for `hash`
    /// for an ERC1271 `signer` contract.
    function isValidERC1271SignatureNow(address signer, bytes32 hash, bytes32 r, bytes32 vs)
        internal
        view
        returns (bool isValid)
    {
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40)
            let f := shl(224, 0x1626ba7e)
            mstore(m, f) // `bytes4(keccak256("isValidSignature(bytes32,bytes)"))`.
            mstore(add(m, 0x04), hash)
            let d := add(m, 0x24)
            mstore(d, 0x40) // The offset of the `signature` in the calldata.
            mstore(add(m, 0x44), 65) // Length of the signature.
            mstore(add(m, 0x64), r) // `r`.
            mstore(add(m, 0x84), shr(1, shl(1, vs))) // `s`.
            mstore8(add(m, 0xa4), add(shr(255, vs), 27)) // `v`.
            // forgefmt: disable-next-item
            isValid := and(
                // Whether the returndata is the magic value `0x1626ba7e` (left-aligned).
                eq(mload(d), f),
                // Whether the staticcall does not revert.
                // This must be placed at the end of the `and` clause,
                // as the arguments are evaluated from right to left.
                staticcall(
                    gas(), // Remaining gas.
                    signer, // The `signer` address.
                    m, // Offset of calldata in memory.
                    0xa5, // Length of calldata in memory.
                    d, // Offset of returndata.
                    0x20 // Length of returndata to write.
                )
            )
        }
    }
    /// @dev Returns whether the signature (`v`, `r`, `s`) is valid for `hash`
    /// for an ERC1271 `signer` contract.
    function isValidERC1271SignatureNow(address signer, bytes32 hash, uint8 v, bytes32 r, bytes32 s)
        internal
        view
        returns (bool isValid)
    {
        /// @solidity memory-safe-assembly
        assembly {
            let m := mload(0x40)
            let f := shl(224, 0x1626ba7e)
            mstore(m, f) // `bytes4(keccak256("isValidSignature(bytes32,bytes)"))`.
            mstore(add(m, 0x04), hash)
            let d := add(m, 0x24)
            mstore(d, 0x40) // The offset of the `signature` in the calldata.
            mstore(add(m, 0x44), 65) // Length of the signature.
            mstore(add(m, 0x64), r) // `r`.
            mstore(add(m, 0x84), s) // `s`.
            mstore8(add(m, 0xa4), v) // `v`.
            // forgefmt: disable-next-item
            isValid := and(
                // Whether the returndata is the magic value `0x1626ba7e` (left-aligned).
                eq(mload(d), f),
                // Whether the staticcall does not revert.
                // This must be placed at the end of the `and` clause,
                // as the arguments are evaluated from right to left.
                staticcall(
                    gas(), // Remaining gas.
                    signer, // The `signer` address.
                    m, // Offset of calldata in memory.
                    0xa5, // Length of calldata in memory.
                    d, // Offset of returndata.
                    0x20 // Length of returndata to write.
                )
            )
        }
    }
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                     HASHING OPERATIONS                     */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev Returns an Ethereum Signed Message, created from a `hash`.
    /// This produces a hash corresponding to the one signed with the
    /// [`eth_sign`](https://eth.wiki/json-rpc/API#eth_sign)
    /// JSON-RPC method as part of EIP-191.
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32 result) {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x20, hash) // Store into scratch space for keccak256.
            mstore(0x00, "\\x00\\x00\\x00\\x00\\x19Ethereum Signed Message:\
32") // 28 bytes.
            result := keccak256(0x04, 0x3c) // `32 * 2 - (32 - 28) = 60 = 0x3c`.
        }
    }
    /// @dev Returns an Ethereum Signed Message, created from `s`.
    /// This produces a hash corresponding to the one signed with the
    /// [`eth_sign`](https://eth.wiki/json-rpc/API#eth_sign)
    /// JSON-RPC method as part of EIP-191.
    /// Note: Supports lengths of `s` up to 999999 bytes.
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32 result) {
        /// @solidity memory-safe-assembly
        assembly {
            let sLength := mload(s)
            let o := 0x20
            mstore(o, "\\x19Ethereum Signed Message:\
") // 26 bytes, zero-right-padded.
            mstore(0x00, 0x00)
            // Convert the `s.length` to ASCII decimal representation: `base10(s.length)`.
            for { let temp := sLength } 1 {} {
                o := sub(o, 1)
                mstore8(o, add(48, mod(temp, 10)))
                temp := div(temp, 10)
                if iszero(temp) { break }
            }
            let n := sub(0x3a, o) // Header length: `26 + 32 - o`.
            // Throw an out-of-offset error (consumes all gas) if the header exceeds 32 bytes.
            returndatacopy(returndatasize(), returndatasize(), gt(n, 0x20))
            mstore(s, or(mload(0x00), mload(n))) // Temporarily store the header.
            result := keccak256(add(s, sub(0x20, n)), add(n, sLength))
            mstore(s, sLength) // Restore the length.
        }
    }
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                   EMPTY CALLDATA HELPERS                   */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
    /// @dev Returns an empty calldata bytes.
    function emptySignature() internal pure returns (bytes calldata signature) {
        /// @solidity memory-safe-assembly
        assembly {
            signature.length := 0
        }
    }
}