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/**SPDX-License-Identifier: BUSL-1.1

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 */
pragma solidity 0.8.16;

import "contracts/external/openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
import "contracts/external/openzeppelin/contracts-upgradeable/token/ERC20/IERC20MetadataUpgradeable.sol";
import "contracts/external/openzeppelin/contracts-upgradeable/proxy/Initializable.sol";
import "contracts/external/openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol";
import "contracts/external/openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";
import "contracts/external/openzeppelin/contracts-upgradeable/access/AccessControlEnumerableUpgradeable.sol";
import "contracts/usdy/blocklist/BlocklistClientUpgradeable.sol";
import "contracts/usdy/allowlist/AllowlistClientUpgradeable.sol";
import "contracts/sanctions/SanctionsListClientUpgradeable.sol";
import "contracts/interfaces/IUSDY.sol";
import "contracts/rwaOracles/IRWADynamicOracle.sol";

/**
 * @title Interest-bearing ERC20-like token for rUSDY.
 *
 * rUSDY balances are dynamic and represent the holder's share of the underlying USDY
 * controlled by the protocol. To calculate each account's balance, we do
 *
 *   shares[account] * usdyPrice
 *
 * For example, assume that we have:
 *
 *   usdyPrice = 1.05
 *   sharesOf(user1) -> 100
 *   sharesOf(user2) -> 400
 *
 * Therefore:
 *
 *   balanceOf(user1) -> 105 tokens which corresponds 105 rUSDY
 *   balanceOf(user2) -> 420 tokens which corresponds 420 rUSDY
 *
 * Since balances of all token holders change when the price of USDY changes, this
 * token cannot fully implement ERC20 standard: it only emits `Transfer` events
 * upon explicit transfer between holders. In contrast, when total amount of pooled
 * Cash increases, no `Transfer` events are generated: doing so would require emitting
 * an event for each token holder and thus running an unbounded loop.
 *
 */

contract rUSDY is
  Initializable,
  ContextUpgradeable,
  PausableUpgradeable,
  AccessControlEnumerableUpgradeable,
  BlocklistClientUpgradeable,
  AllowlistClientUpgradeable,
  SanctionsListClientUpgradeable,
  IERC20Upgradeable,
  IERC20MetadataUpgradeable
{
  /**
   * @dev rUSDY balances are dynamic and are calculated based on the accounts' shares (USDY)
   * and the the price of USDY. Account shares aren't
   * normalized, so the contract also stores the sum of all shares to calculate
   * each account's token balance which equals to:
   *
   *   shares[account] * usdyPrice
   */
  mapping(address => uint256) private shares;

  /// @dev Allowances are nominated in tokens, not token shares.
  mapping(address => mapping(address => uint256)) private allowances;

  // Total shares in existence
  uint256 private totalShares;

  // Address of the oracle that updates `usdyPrice`
  IRWADynamicOracle public oracle;

  // Address of the USDY token
  IUSDY public usdy;

  // Used to scale up usdy amount -> shares
  uint256 public constant BPS_DENOMINATOR = 10_000;

  // Error when redeeming shares < `BPS_DENOMINATOR`
  error UnwrapTooSmall();

  /// @dev Role based access control roles
  bytes32 public constant USDY_MANAGER_ROLE = keccak256("ADMIN_ROLE");
  bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
  bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");
  bytes32 public constant BURNER_ROLE = keccak256("BURN_ROLE");
  bytes32 public constant LIST_CONFIGURER_ROLE =
    keccak256("LIST_CONFIGURER_ROLE");

  /// @custom:oz-upgrades-unsafe-allow constructor
  constructor() {
    _disableInitializers();
  }

  function initialize(
    address blocklist,
    address allowlist,
    address sanctionsList,
    address _usdy,
    address guardian,
    address _oracle
  ) public virtual initializer {
    __rUSDY_init(blocklist, allowlist, sanctionsList, _usdy, guardian, _oracle);
  }

  function __rUSDY_init(
    address blocklist,
    address allowlist,
    address sanctionsList,
    address _usdy,
    address guardian,
    address _oracle
  ) internal onlyInitializing {
    __BlocklistClientInitializable_init(blocklist);
    __AllowlistClientInitializable_init(allowlist);
    __SanctionsListClientInitializable_init(sanctionsList);
    __rUSDY_init_unchained(_usdy, guardian, _oracle);
  }

  function __rUSDY_init_unchained(
    address _usdy,
    address guardian,
    address _oracle
  ) internal onlyInitializing {
    usdy = IUSDY(_usdy);
    oracle = IRWADynamicOracle(_oracle);
    _grantRole(DEFAULT_ADMIN_ROLE, guardian);
    _grantRole(USDY_MANAGER_ROLE, guardian);
    _grantRole(PAUSER_ROLE, guardian);
    _grantRole(MINTER_ROLE, guardian);
    _grantRole(BURNER_ROLE, guardian);
    _grantRole(LIST_CONFIGURER_ROLE, guardian);
  }

  /**
   * @notice An executed shares transfer from `sender` to `recipient`.
   *
   * @dev emitted in pair with an ERC20-defined `Transfer` event.
   */
  event TransferShares(
    address indexed from,
    address indexed to,
    uint256 sharesValue
  );

  /**
   * @notice An executed `burnShares` request
   *
   * @dev Reports simultaneously burnt shares amount
   * and corresponding rUSDY amount.
   * The shares amount is calculated twice: before and after the burning incurred rebase.
   *
   * @param account holder of the burnt shares
   * @param preRebaseTokenAmount amount of rUSDY the burnt shares (USDY) corresponded to before the burn
   * @param postRebaseTokenAmount amount of rUSDY the burnt shares (USDY) corresponded to after the burn
   * @param sharesAmount amount of burnt shares
   */
  event SharesBurnt(
    address indexed account,
    uint256 preRebaseTokenAmount,
    uint256 postRebaseTokenAmount,
    uint256 sharesAmount
  );

  /**
   * @notice An executed `burnShares` request
   *
   * @dev Reports simultaneously burnt shares amount
   * and corresponding rUSDY amount.
   * The rUSDY amount is calculated twice: before and after the burning incurred rebase.
   *
   * @param account holder of the burnt shares
   * @param tokensBurnt amount of burnt tokens
   */
  event TokensBurnt(address indexed account, uint256 tokensBurnt);

  /**
   * @return the name of the token.
   */
  function name() public pure returns (string memory) {
    return "Test - Rebasing Ondo U.S. Dollar Yield";
  }

  /**
   * @return the symbol of the token, usually a shorter version of the
   * name.
   */
  function symbol() public pure returns (string memory) {
    return "t-rUSDY";
  }

  /**
   * @return the number of decimals for getting user representation of a token amount.
   */
  function decimals() public pure returns (uint8) {
    return 18;
  }

  /**
   * @return the amount of tokens in existence.
   */
  function totalSupply() public view returns (uint256) {
    return (totalShares * oracle.getPrice()) / (1e18 * BPS_DENOMINATOR);
  }

  /**
   * @return the amount of tokens owned by the `_account`.
   *
   * @dev Balances are dynamic and equal the `_account`'s USDY shares multiplied
   *      by the price of USDY
   */
  function balanceOf(address _account) public view returns (uint256) {
    return (_sharesOf(_account) * oracle.getPrice()) / (1e18 * BPS_DENOMINATOR);
  }

  /**
   * @notice Moves `_amount` tokens from the caller's account to the `_recipient` account.
   *
   * @return a boolean value indicating whether the operation succeeded.
   * Emits a `Transfer` event.
   * Emits a `TransferShares` event.
   *
   * Requirements:
   *
   * - `_recipient` cannot be the zero address.
   * - the caller must have a balance of at least `_amount`.
   * - the contract must not be paused.
   *
   * @dev The `_amount` argument is the amount of tokens, not shares.
   */
  function transfer(address _recipient, uint256 _amount) public returns (bool) {
    _transfer(msg.sender, _recipient, _amount);
    return true;
  }

  /**
   * @return the remaining number of tokens that `_spender` is allowed to spend
   * on behalf of `_owner` through `transferFrom`. This is zero by default.
   *
   * @dev This value changes when `approve` or `transferFrom` is called.
   */
  function allowance(
    address _owner,
    address _spender
  ) public view returns (uint256) {
    return allowances[_owner][_spender];
  }

  /**
   * @notice Sets `_amount` as the allowance of `_spender` over the caller's tokens.
   *
   * @return a boolean value indicating whether the operation succeeded.
   * Emits an `Approval` event.
   *
   * Requirements:
   *
   * - `_spender` cannot be the zero address.
   * - the contract must not be paused.
   *
   * @dev The `_amount` argument is the amount of tokens, not shares.
   */
  function approve(address _spender, uint256 _amount) public returns (bool) {
    _approve(msg.sender, _spender, _amount);
    return true;
  }

  /**
   * @notice Moves `_amount` tokens from `_sender` to `_recipient` using the
   * allowance mechanism. `_amount` is then deducted from the caller's
   * allowance.
   *
   * @return a boolean value indicating whether the operation succeeded.
   *
   * Emits a `Transfer` event.
   * Emits a `TransferShares` event.
   * Emits an `Approval` event indicating the updated allowance.
   *
   * Requirements:
   *
   * - `_sender` and `_recipient` cannot be the zero addresses.
   * - `_sender` must have a balance of at least `_amount`.
   * - the caller must have allowance for `_sender`'s tokens of at least `_amount`.
   * - the contract must not be paused.
   *
   * @dev The `_amount` argument is the amount of tokens, not shares.
   */
  function transferFrom(
    address _sender,
    address _recipient,
    uint256 _amount
  ) public returns (bool) {
    uint256 currentAllowance = allowances[_sender][msg.sender];
    require(currentAllowance >= _amount, "TRANSFER_AMOUNT_EXCEEDS_ALLOWANCE");

    _transfer(_sender, _recipient, _amount);
    _approve(_sender, msg.sender, currentAllowance - _amount);
    return true;
  }

  /**
   * @notice Atomically increases the allowance granted to `_spender` by the caller by `_addedValue`.
   *
   * This is an alternative to `approve` that can be used as a mitigation for
   * problems described in:
   * https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/IERC20.sol#L42
   * Emits an `Approval` event indicating the updated allowance.
   *
   * Requirements:
   *
   * - `_spender` cannot be the the zero address.
   * - the contract must not be paused.
   */
  function increaseAllowance(
    address _spender,
    uint256 _addedValue
  ) public returns (bool) {
    _approve(
      msg.sender,
      _spender,
      allowances[msg.sender][_spender] + _addedValue
    );
    return true;
  }

  /**
   * @notice Atomically decreases the allowance granted to `_spender` by the caller by `_subtractedValue`.
   *
   * This is an alternative to `approve` that can be used as a mitigation for
   * problems described in:
   * https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/IERC20.sol#L42
   * 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`.
   * - the contract must not be paused.
   */
  function decreaseAllowance(
    address _spender,
    uint256 _subtractedValue
  ) public returns (bool) {
    uint256 currentAllowance = allowances[msg.sender][_spender];
    require(
      currentAllowance >= _subtractedValue,
      "DECREASED_ALLOWANCE_BELOW_ZERO"
    );
    _approve(msg.sender, _spender, currentAllowance - _subtractedValue);
    return true;
  }

  /**
   * @return the total amount of shares in existence.
   *
   * @dev The sum of all accounts' shares can be an arbitrary number, therefore
   * it is necessary to store it in order to calculate each account's relative share.
   */
  function getTotalShares() public view returns (uint256) {
    return totalShares;
  }

  /**
   * @return the amount of shares owned by `_account`.
   *
   * @dev This is the equivalent to the amount of USDY wrapped by `_account`.
   */
  function sharesOf(address _account) public view returns (uint256) {
    return _sharesOf(_account);
  }

  /**
   * @return the amount of USDY that corresponds to `_rUSDYAmount` of rUSDY
   */
  function getSharesByRUSDY(
    uint256 _rUSDYAmount
  ) public view returns (uint256) {
    return (_rUSDYAmount * 1e18 * BPS_DENOMINATOR) / oracle.getPrice();
  }

  /**
   * @return the amount of rUSDY that corresponds to `_shares` of usdy.
   */
  function getRUSDYByShares(uint256 _shares) public view returns (uint256) {
    return (_shares * oracle.getPrice()) / (1e18 * BPS_DENOMINATOR);
  }

  /**
   * @notice Moves `_sharesAmount` token shares from the caller's account to the `_recipient` account.
   *
   * @return amount of transferred tokens.
   * Emits a `TransferShares` event.
   * Emits a `Transfer` event.
   *
   * Requirements:
   *
   * - `_recipient` cannot be the zero address.
   * - the caller must have at least `_sharesAmount` shares.
   * - the contract must not be paused.
   *
   * @dev The `_sharesAmount` argument is the amount of shares, not tokens.
   */
  function transferShares(
    address _recipient,
    uint256 _sharesAmount
  ) public returns (uint256) {
    _transferShares(msg.sender, _recipient, _sharesAmount);
    emit TransferShares(msg.sender, _recipient, _sharesAmount);
    uint256 tokensAmount = getRUSDYByShares(_sharesAmount);
    emit Transfer(msg.sender, _recipient, tokensAmount);
    return tokensAmount;
  }

  /**
   * @notice Function called by users to wrap their USDY tokens
   *
   * @param _USDYAmount The amount of USDY Tokens to wrap
   *
   * @dev Sanctions, Blocklist, and Allowlist checks implicit in USDY Transfer
   */
  function wrap(uint256 _USDYAmount) external whenNotPaused {
    require(_USDYAmount > 0, "rUSDY: can't wrap zero USDY tokens");
    uint256 usdySharesAmount = _USDYAmount * BPS_DENOMINATOR;
    _mintShares(msg.sender, usdySharesAmount);
    usdy.transferFrom(msg.sender, address(this), _USDYAmount);
    emit Transfer(address(0), msg.sender, getRUSDYByShares(usdySharesAmount));
    emit TransferShares(address(0), msg.sender, usdySharesAmount);
  }

  /**
   * @notice Function called by users to unwrap their rUSDY tokens
   *
   * @param _rUSDYAmount The amount of rUSDY to unwrap
   *
   * @dev Sanctions, Blocklist, and Allowlist checks implicit in USDY Transfer
   */
  function unwrap(uint256 _rUSDYAmount) external whenNotPaused {
    require(_rUSDYAmount > 0, "rUSDY: can't unwrap zero rUSDY tokens");
    uint256 usdyAmount = getSharesByRUSDY(_rUSDYAmount);
    if (usdyAmount < BPS_DENOMINATOR) revert UnwrapTooSmall();
    _burnShares(msg.sender, usdyAmount);
    usdy.transfer(msg.sender, usdyAmount / BPS_DENOMINATOR);
    emit TokensBurnt(msg.sender, _rUSDYAmount);
  }

  /**
   * @notice Moves `_amount` tokens from `_sender` to `_recipient`.
   * Emits a `Transfer` event.
   * Emits a `TransferShares` event.
   */
  function _transfer(
    address _sender,
    address _recipient,
    uint256 _amount
  ) internal {
    uint256 _sharesToTransfer = getSharesByRUSDY(_amount);
    _transferShares(_sender, _recipient, _sharesToTransfer);
    emit Transfer(_sender, _recipient, _amount);
    emit TransferShares(_sender, _recipient, _sharesToTransfer);
  }

  /**
   * @notice Sets `_amount` as the allowance of `_spender` over the `_owner` s tokens.
   *
   * Emits an `Approval` event.
   *
   * Requirements:
   *
   * - `_owner` cannot be the zero address.
   * - `_spender` cannot be the zero address.
   * - the contract must not be paused.
   */
  function _approve(
    address _owner,
    address _spender,
    uint256 _amount
  ) internal whenNotPaused {
    require(_owner != address(0), "APPROVE_FROM_ZERO_ADDRESS");
    require(_spender != address(0), "APPROVE_TO_ZERO_ADDRESS");

    allowances[_owner][_spender] = _amount;
    emit Approval(_owner, _spender, _amount);
  }

  /**
   * @return the amount of shares owned by `_account`.
   */
  function _sharesOf(address _account) internal view returns (uint256) {
    return shares[_account];
  }

  /**
   * @notice Moves `_sharesAmount` shares from `_sender` to `_recipient`.
   *
   * Requirements:
   *
   * - `_sender` cannot be the zero address.
   * - `_recipient` cannot be the zero address.
   * - `_sender` must hold at least `_sharesAmount` shares.
   * - the contract must not be paused.
   */
  function _transferShares(
    address _sender,
    address _recipient,
    uint256 _sharesAmount
  ) internal whenNotPaused {
    require(_sender != address(0), "TRANSFER_FROM_THE_ZERO_ADDRESS");
    require(_recipient != address(0), "TRANSFER_TO_THE_ZERO_ADDRESS");

    _beforeTokenTransfer(_sender, _recipient, _sharesAmount);

    uint256 currentSenderShares = shares[_sender];
    require(
      _sharesAmount <= currentSenderShares,
      "TRANSFER_AMOUNT_EXCEEDS_BALANCE"
    );

    shares[_sender] = currentSenderShares - _sharesAmount;
    shares[_recipient] = shares[_recipient] + _sharesAmount;
  }

  /**
   * @notice Creates `_sharesAmount` shares and assigns them to `_recipient`, increasing the total amount of shares.
   * @dev This doesn't increase the token total supply.
   *
   * Requirements:
   *
   * - `_recipient` cannot be the zero address.
   * - the contract must not be paused.
   */
  function _mintShares(
    address _recipient,
    uint256 _sharesAmount
  ) internal whenNotPaused returns (uint256) {
    require(_recipient != address(0), "MINT_TO_THE_ZERO_ADDRESS");

    _beforeTokenTransfer(address(0), _recipient, _sharesAmount);

    totalShares += _sharesAmount;

    shares[_recipient] = shares[_recipient] + _sharesAmount;

    return totalShares;

    // Notice: we're not emitting a Transfer event from the zero address here since shares mint
    // works by taking the amount of tokens corresponding to the minted shares from all other
    // token holders, proportionally to their share. The total supply of the token doesn't change
    // as the result. This is equivalent to performing a send from each other token holder's
    // address to `address`, but we cannot reflect this as it would require sending an unbounded
    // number of events.
  }

  /**
   * @notice Destroys `_sharesAmount` shares from `_account`'s holdings, decreasing the total amount of shares.
   * @dev This doesn't decrease the token total supply.
   *
   * Requirements:
   *
   * - `_account` cannot be the zero address.
   * - `_account` must hold at least `_sharesAmount` shares.
   * - the contract must not be paused.
   */
  function _burnShares(
    address _account,
    uint256 _sharesAmount
  ) internal whenNotPaused returns (uint256) {
    require(_account != address(0), "BURN_FROM_THE_ZERO_ADDRESS");

    _beforeTokenTransfer(_account, address(0), _sharesAmount);

    uint256 accountShares = shares[_account];
    require(_sharesAmount <= accountShares, "BURN_AMOUNT_EXCEEDS_BALANCE");

    uint256 preRebaseTokenAmount = getRUSDYByShares(_sharesAmount);

    totalShares -= _sharesAmount;

    shares[_account] = accountShares - _sharesAmount;

    uint256 postRebaseTokenAmount = getRUSDYByShares(_sharesAmount);

    emit SharesBurnt(
      _account,
      preRebaseTokenAmount,
      postRebaseTokenAmount,
      _sharesAmount
    );

    return totalShares;

    // Notice: we're not emitting a Transfer event to the zero address here since shares burn
    // works by redistributing the amount of tokens corresponding to the burned shares between
    // all other token holders. The total supply of the token doesn't change as the result.
    // This is equivalent to performing a send from `address` to each other token holder address,
    // but we cannot reflect this as it would require sending an unbounded number of events.

    // We're emitting `SharesBurnt` event to provide an explicit rebase log record nonetheless.
  }

  /**
   * @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 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
  ) internal view {
    // Check constraints when `transferFrom` is called to facliitate
    // a transfer between two parties that are not `from` or `to`.
    if (from != msg.sender && to != msg.sender) {
      require(!_isBlocked(msg.sender), "rUSDY: 'sender' address blocked");
      require(!_isSanctioned(msg.sender), "rUSDY: 'sender' address sanctioned");
      require(
        _isAllowed(msg.sender),
        "rUSDY: 'sender' address not on allowlist"
      );
    }

    if (from != address(0)) {
      // If not minting
      require(!_isBlocked(from), "rUSDY: 'from' address blocked");
      require(!_isSanctioned(from), "rUSDY: 'from' address sanctioned");
      require(_isAllowed(from), "rUSDY: 'from' address not on allowlist");
    }

    if (to != address(0)) {
      // If not burning
      require(!_isBlocked(to), "rUSDY: 'to' address blocked");
      require(!_isSanctioned(to), "rUSDY: 'to' address sanctioned");
      require(_isAllowed(to), "rUSDY: 'to' address not on allowlist");
    }
  }

  /**
   * @notice Sets the Oracle address
   * @dev The new oracle must comply with the `IPricerReader` interface
   * @param _oracle Address of the new oracle
   */
  function setOracle(address _oracle) external onlyRole(USDY_MANAGER_ROLE) {
    oracle = IRWADynamicOracle(_oracle);
  }

  /**
   * @notice Admin burn function to burn rUSDY tokens from any account
   * @param _account The account to burn tokens from
   * @param _amount  The amount of rUSDY tokens to burn
   * @dev Transfers burned shares (USDY) to `msg.sender`
   */
  function burn(
    address _account,
    uint256 _amount
  ) external onlyRole(BURNER_ROLE) {
    uint256 sharesAmount = getSharesByRUSDY(_amount);

    _burnShares(_account, sharesAmount);

    usdy.transfer(msg.sender, sharesAmount / BPS_DENOMINATOR);

    emit TokensBurnt(_account, _amount);
  }

  function pause() external onlyRole(PAUSER_ROLE) {
    _pause();
  }

  function unpause() external onlyRole(USDY_MANAGER_ROLE) {
    _unpause();
  }

  /**
   * @notice Sets the blocklist address
   *
   * @param blocklist New blocklist address
   */
  function setBlocklist(
    address blocklist
  ) external override onlyRole(LIST_CONFIGURER_ROLE) {
    _setBlocklist(blocklist);
  }

  /**
   * @notice Sets the allowlist address
   *
   * @param allowlist New allowlist address
   */
  function setAllowlist(
    address allowlist
  ) external override onlyRole(LIST_CONFIGURER_ROLE) {
    _setAllowlist(allowlist);
  }

  /**
   * @notice Sets the sanctions list address
   *
   * @param sanctionsList New sanctions list address
   */
  function setSanctionsList(
    address sanctionsList
  ) external override onlyRole(LIST_CONFIGURER_ROLE) {
    _setSanctionsList(sanctionsList);
  }
}

/**SPDX-License-Identifier: BUSL-1.1

      ▄▄█████████▄
   ╓██▀└ ,╓▄▄▄, '▀██▄
  ██▀ ▄██▀▀╙╙▀▀██▄ └██µ           ,,       ,,      ,     ,,,            ,,,
 ██ ,██¬ ▄████▄  ▀█▄ ╙█▄      ▄███▀▀███▄   ███▄    ██  ███▀▀▀███▄    ▄███▀▀███,
██  ██ ╒█▀'   ╙█▌ ╙█▌ ██     ▐██      ███  █████,  ██  ██▌    └██▌  ██▌     └██▌
██ ▐█▌ ██      ╟█  █▌ ╟█     ██▌      ▐██  ██ └███ ██  ██▌     ╟██ j██       ╟██
╟█  ██ ╙██    ▄█▀ ▐█▌ ██     ╙██      ██▌  ██   ╙████  ██▌    ▄██▀  ██▌     ,██▀
 ██ "██, ╙▀▀███████████⌐      ╙████████▀   ██     ╙██  ███████▀▀     ╙███████▀`
  ██▄ ╙▀██▄▄▄▄▄,,,                ¬─                                    '─¬
   ╙▀██▄ '╙╙╙▀▀▀▀▀▀▀▀
      ╙▀▀██████R⌐

 */

import "contracts/external/openzeppelin/contracts/token/IERC20.sol";

pragma solidity 0.8.16; // latest available for using OZ

interface IUSDY is IERC20 {
  function getPooledCashByShares(uint256) external view returns (uint256);

  function getSharesByPooledCash(uint256) external view returns (uint256);
}

/**SPDX-License-Identifier: BUSL-1.1

      ▄▄█████████▄
   ╓██▀└ ,╓▄▄▄, '▀██▄
  ██▀ ▄██▀▀╙╙▀▀██▄ └██µ           ,,       ,,      ,     ,,,            ,,,
 ██ ,██¬ ▄████▄  ▀█▄ ╙█▄      ▄███▀▀███▄   ███▄    ██  ███▀▀▀███▄    ▄███▀▀███,
██  ██ ╒█▀'   ╙█▌ ╙█▌ ██     ▐██      ███  █████,  ██  ██▌    └██▌  ██▌     └██▌
██ ▐█▌ ██      ╟█  █▌ ╟█     ██▌      ▐██  ██ └███ ██  ██▌     ╟██ j██       ╟██
╟█  ██ ╙██    ▄█▀ ▐█▌ ██     ╙██      ██▌  ██   ╙████  ██▌    ▄██▀  ██▌     ,██▀
 ██ "██, ╙▀▀███████████⌐      ╙████████▀   ██     ╙██  ███████▀▀     ╙███████▀`
  ██▄ ╙▀██▄▄▄▄▄,,,                ¬─                                    '─¬
   ╙▀██▄ '╙╙╙▀▀▀▀▀▀▀▀
      ╙▀▀██████R⌐

 */
pragma solidity 0.8.16;

interface IRWADynamicOracle {
  /// @notice Retrieve RWA price data
  function getPrice() external view returns (uint256);
}

/**SPDX-License-Identifier: BUSL-1.1

      ▄▄█████████▄
   ╓██▀└ ,╓▄▄▄, '▀██▄
  ██▀ ▄██▀▀╙╙▀▀██▄ └██µ           ,,       ,,      ,     ,,,            ,,,
 ██ ,██¬ ▄████▄  ▀█▄ ╙█▄      ▄███▀▀███▄   ███▄    ██  ███▀▀▀███▄    ▄███▀▀███,
██  ██ ╒█▀'   ╙█▌ ╙█▌ ██     ▐██      ███  █████,  ██  ██▌    └██▌  ██▌     └██▌
██ ▐█▌ ██      ╟█  █▌ ╟█     ██▌      ▐██  ██ └███ ██  ██▌     ╟██ j██       ╟██
╟█  ██ ╙██    ▄█▀ ▐█▌ ██     ╙██      ██▌  ██   ╙████  ██▌    ▄██▀  ██▌     ,██▀
 ██ "██, ╙▀▀███████████⌐      ╙████████▀   ██     ╙██  ███████▀▀     ╙███████▀`
  ██▄ ╙▀██▄▄▄▄▄,,,                ¬─                                    '─¬
   ╙▀██▄ '╙╙╙▀▀▀▀▀▀▀▀
      ╙▀▀██████R⌐

 */
pragma solidity 0.8.16;

import "contracts/external/openzeppelin/contracts-upgradeable/proxy/Initializable.sol";
import "contracts/external/chainalysis/ISanctionsList.sol";
import "contracts/sanctions/ISanctionsListClient.sol";

/**
 * @title SanctionsListClient
 * @author Ondo Finance
 * @notice This abstract contract enables inheritors to query whether accounts
 *         are sanctioned or not
 */
abstract contract SanctionsListClientUpgradeable is
  Initializable,
  ISanctionsListClient
{
  // Sanctions list address
  ISanctionsList public override sanctionsList;

  /**
   * @notice Initialize the contract by setting blocklist variable
   *
   * @param _sanctionsList Address of the sanctionsList contract
   *
   * @dev Function should be called by the inheriting contract on
   *      initialization
   */
  function __SanctionsListClientInitializable_init(
    address _sanctionsList
  ) internal onlyInitializing {
    __SanctionsListClientInitializable_init_unchained(_sanctionsList);
  }

  /**
   * @dev Internal function to future-proof parent linearization. Matches OZ
   *      upgradeable suggestions
   */
  function __SanctionsListClientInitializable_init_unchained(
    address _sanctionsList
  ) internal onlyInitializing {
    _setSanctionsList(_sanctionsList);
  }

  /**
   * @notice Sets the sanctions list address for this client
   *
   * @param _sanctionsList The new sanctions list address
   */
  function _setSanctionsList(address _sanctionsList) internal {
    if (_sanctionsList == address(0)) {
      revert SanctionsListZeroAddress();
    }
    address oldSanctionsList = address(sanctionsList);
    sanctionsList = ISanctionsList(_sanctionsList);
    emit SanctionsListSet(oldSanctionsList, _sanctionsList);
  }

  /**
   * @notice Checks whether an address has been sanctioned
   *
   * @param account The account to check
   */
  function _isSanctioned(address account) internal view returns (bool) {
    return sanctionsList.isSanctioned(account);
  }

  /**
   * @dev This empty reserved space is put in place to allow future versions to add new
   * variables without shifting down storage in the inheritance chain.
   * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
   */
  uint256[50] private __gap;
}

/**SPDX-License-Identifier: BUSL-1.1

      ▄▄█████████▄
   ╓██▀└ ,╓▄▄▄, '▀██▄
  ██▀ ▄██▀▀╙╙▀▀██▄ └██µ           ,,       ,,      ,     ,,,            ,,,
 ██ ,██¬ ▄████▄  ▀█▄ ╙█▄      ▄███▀▀███▄   ███▄    ██  ███▀▀▀███▄    ▄███▀▀███,
██  ██ ╒█▀'   ╙█▌ ╙█▌ ██     ▐██      ███  █████,  ██  ██▌    └██▌  ██▌     └██▌
██ ▐█▌ ██      ╟█  █▌ ╟█     ██▌      ▐██  ██ └███ ██  ██▌     ╟██ j██       ╟██
╟█  ██ ╙██    ▄█▀ ▐█▌ ██     ╙██      ██▌  ██   ╙████  ██▌    ▄██▀  ██▌     ,██▀
 ██ "██, ╙▀▀███████████⌐      ╙████████▀   ██     ╙██  ███████▀▀     ╙███████▀`
  ██▄ ╙▀██▄▄▄▄▄,,,                ¬─                                    '─¬
   ╙▀██▄ '╙╙╙▀▀▀▀▀▀▀▀
      ╙▀▀██████R⌐

 */
pragma solidity 0.8.16;

import "contracts/interfaces/IBlocklist.sol";
import "contracts/interfaces/IBlocklistClient.sol";
import "contracts/external/openzeppelin/contracts-upgradeable/proxy/Initializable.sol";

/**
 * @title BlocklistClient
 * @author Ondo Finance
 * @notice This abstract contract manages state for upgradeable blocklist
 *         clients
 */
abstract contract BlocklistClientUpgradeable is
  Initializable,
  IBlocklistClient
{
  // Blocklist contract
  IBlocklist public override blocklist;

  /**
   * @notice Initialize the contract by setting blocklist variable
   *
   * @param _blocklist Address of the blocklist contract
   *
   * @dev Function should be called by the inheriting contract on
   *      initialization
   */
  function __BlocklistClientInitializable_init(
    address _blocklist
  ) internal onlyInitializing {
    __BlocklistClientInitializable_init_unchained(_blocklist);
  }

  /**
   * @dev Internal function to future-proof parent linearization. Matches OZ
   *      upgradeable suggestions
   */
  function __BlocklistClientInitializable_init_unchained(
    address _blocklist
  ) internal onlyInitializing {
    _setBlocklist(_blocklist);
  }

  /**
   * @notice Sets the blocklist address for this client
   *
   * @param _blocklist The new blocklist address
   */
  function _setBlocklist(address _blocklist) internal {
    if (_blocklist == address(0)) {
      revert BlocklistZeroAddress();
    }
    address oldBlocklist = address(blocklist);
    blocklist = IBlocklist(_blocklist);
    emit BlocklistSet(oldBlocklist, _blocklist);
  }

  /**
   * @notice Checks whether an address has been blocked
   *
   * @param account The account to check
   */
  function _isBlocked(address account) internal view returns (bool) {
    return blocklist.isBlocked(account);
  }

  /**
   * @dev This empty reserved space is put in place to allow future versions to add new
   * variables without shifting down storage in the inheritance chain.
   * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
   */
  uint256[50] private __gap;
}

/**SPDX-License-Identifier: BUSL-1.1

      ▄▄█████████▄
   ╓██▀└ ,╓▄▄▄, '▀██▄
  ██▀ ▄██▀▀╙╙▀▀██▄ └██µ           ,,       ,,      ,     ,,,            ,,,
 ██ ,██¬ ▄████▄  ▀█▄ ╙█▄      ▄███▀▀███▄   ███▄    ██  ███▀▀▀███▄    ▄███▀▀███,
██  ██ ╒█▀'   ╙█▌ ╙█▌ ██     ▐██      ███  █████,  ██  ██▌    └██▌  ██▌     └██▌
██ ▐█▌ ██      ╟█  █▌ ╟█     ██▌      ▐██  ██ └███ ██  ██▌     ╟██ j██       ╟██
╟█  ██ ╙██    ▄█▀ ▐█▌ ██     ╙██      ██▌  ██   ╙████  ██▌    ▄██▀  ██▌     ,██▀
 ██ "██, ╙▀▀███████████⌐      ╙████████▀   ██     ╙██  ███████▀▀     ╙███████▀`
  ██▄ ╙▀██▄▄▄▄▄,,,                ¬─                                    '─¬
   ╙▀██▄ '╙╙╙▀▀▀▀▀▀▀▀
      ╙▀▀██████R⌐

 */
pragma solidity 0.8.16;

import "contracts/interfaces/IAllowlist.sol";
import "contracts/interfaces/IAllowlistClient.sol";
import "contracts/external/openzeppelin/contracts-upgradeable/proxy/Initializable.sol";

/**
 * @title AllowlistClientInitializable
 * @author Ondo Finance
 * @notice This abstract contract manages state required for clients
 *         of the allowlist
 */
abstract contract AllowlistClientUpgradeable is
  Initializable,
  IAllowlistClient
{
  // allowlist address
  IAllowlist public override allowlist;

  /**
   * @notice Initialize the contract by setting allowlist variable
   *
   * @param _allowlist Address of the allowlist contract
   *
   * @dev Function should be called by the inheriting contract on
   *      initialization
   */
  function __AllowlistClientInitializable_init(
    address _allowlist
  ) internal onlyInitializing {
    __AllowlistClientInitializable_init_unchained(_allowlist);
  }

  /**
   * @dev Internal function to future-proof parent linearization. Matches OZ
   *      upgradeable suggestions
   */
  function __AllowlistClientInitializable_init_unchained(
    address _allowlist
  ) internal onlyInitializing {
    _setAllowlist(_allowlist);
  }

  /**
   * @notice Sets the allowlist address for this client
   *
   * @param _allowlist The new allowlist address
   */
  function _setAllowlist(address _allowlist) internal {
    if (_allowlist == address(0)) {
      revert AllowlistZeroAddress();
    }
    address oldAllowlist = address(allowlist);
    allowlist = IAllowlist(_allowlist);
    emit AllowlistSet(oldAllowlist, _allowlist);
  }

  /**
   * @notice Checks whether an address has been Blocked
   *
   * @param account The account to check
   */
  function _isAllowed(address account) internal view returns (bool) {
    return allowlist.isAllowed(account);
  }

  /**
   * @dev This empty reserved space is put in place to allow future versions to add new
   * variables without shifting down storage in the inheritance chain.
   * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
   */
  uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (access/AccessControlEnumerable.sol)

pragma solidity ^0.8.0;

import "contracts/external/openzeppelin/contracts-upgradeable/access/IAccessControlEnumerableUpgradeable.sol";
import "contracts/external/openzeppelin/contracts-upgradeable/access/AccessControlUpgradeable.sol";
import "contracts/external/openzeppelin/contracts-upgradeable/utils/EnumerableSetUpgradeable.sol";
import "contracts/external/openzeppelin/contracts-upgradeable/proxy/Initializable.sol";

/**
 * @dev Extension of {AccessControl} that allows enumerating the members of each role.
 */
abstract contract AccessControlEnumerableUpgradeable is
  Initializable,
  IAccessControlEnumerableUpgradeable,
  AccessControlUpgradeable
{
  function __AccessControlEnumerable_init() internal onlyInitializing {}

  function __AccessControlEnumerable_init_unchained()
    internal
    onlyInitializing
  {}

  using EnumerableSetUpgradeable for EnumerableSetUpgradeable.AddressSet;

  mapping(bytes32 => EnumerableSetUpgradeable.AddressSet) private _roleMembers;

  /**
   * @dev See {IERC165-supportsInterface}.
   */
  function supportsInterface(bytes4 interfaceId)
    public
    view
    virtual
    override
    returns (bool)
  {
    return
      interfaceId == type(IAccessControlEnumerableUpgradeable).interfaceId ||
      super.supportsInterface(interfaceId);
  }

  /**
   * @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
    virtual
    override
    returns (address)
  {
    return _roleMembers[role].at(index);
  }

  /**
   * @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
    virtual
    override
    returns (uint256)
  {
    return _roleMembers[role].length();
  }

  /**
   * @dev Overload {_grantRole} to track enumerable memberships
   */
  function _grantRole(bytes32 role, address account) internal virtual override {
    super._grantRole(role, account);
    _roleMembers[role].add(account);
  }

  /**
   * @dev Overload {_revokeRole} to track enumerable memberships
   */
  function _revokeRole(bytes32 role, address account)
    internal
    virtual
    override
  {
    super._revokeRole(role, account);
    _roleMembers[role].remove(account);
  }

  /**
   * @dev This empty reserved space is put in place to allow future versions to add new
   * variables without shifting down storage in the inheritance chain.
   * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
   */
  uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

import "contracts/external/openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol";
import "contracts/external/openzeppelin/contracts-upgradeable/proxy/Initializable.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.
 */
abstract contract PausableUpgradeable is Initializable, ContextUpgradeable {
  /**
   * @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.
   */
  function __Pausable_init() internal onlyInitializing {
    __Pausable_init_unchained();
  }

  function __Pausable_init_unchained() internal onlyInitializing {
    _paused = false;
  }

  /**
   * @dev Modifier to make a function callable only when the contract is not paused.
   *
   * Requirements:
   *
   * - The contract must not be paused.
   */
  modifier whenNotPaused() {
    _requireNotPaused();
    _;
  }

  /**
   * @dev Modifier to make a function callable only when the contract is paused.
   *
   * Requirements:
   *
   * - The contract must be paused.
   */
  modifier whenPaused() {
    _requirePaused();
    _;
  }

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

  /**
   * @dev Throws if the contract is paused.
   */
  function _requireNotPaused() internal view virtual {
    require(!paused(), "Pausable: paused");
  }

  /**
   * @dev Throws if the contract is not paused.
   */
  function _requirePaused() internal view virtual {
    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());
  }

  /**
   * @dev This empty reserved space is put in place to allow future versions to add new
   * variables without shifting down storage in the inheritance chain.
   * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
   */
  uint256[49] private __gap;
}

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

pragma solidity ^0.8.0;
import "contracts/external/openzeppelin/contracts-upgradeable/proxy/Initializable.sol";

/**
 * @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 ContextUpgradeable is Initializable {
  function __Context_init() internal onlyInitializing {}

  function __Context_init_unchained() internal onlyInitializing {}

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

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

  /**
   * @dev This empty reserved space is put in place to allow future versions to add new
   * variables without shifting down storage in the inheritance chain.
   * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
   */
  uint256[50] private __gap;
}

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

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
  /**
   * @dev Emitted when `value` tokens are moved from one account (`from`) to
   * another (`to`).
   *
   * Note that `value` may be zero.
   */
  event Transfer(address indexed from, address indexed to, uint256 value);

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

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

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

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

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

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

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

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

pragma solidity ^0.8.0;

import "contracts/external/openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20MetadataUpgradeable is IERC20Upgradeable {
  /**
   * @dev Returns the name of the token.
   */
  function name() external view returns (string memory);

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "contracts/external/openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
  /**
   * @dev Indicates that the contract has been initialized.
   * @custom:oz-retyped-from bool
   */
  uint8 private _initialized;

  /**
   * @dev Indicates that the contract is in the process of being initialized.
   */
  bool private _initializing;

  /**
   * @dev Triggered when the contract has been initialized or reinitialized.
   */
  event Initialized(uint8 version);

  /**
   * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
   * `onlyInitializing` functions can be used to initialize parent contracts. Equivalent to `reinitializer(1)`.
   */
  modifier initializer() {
    bool isTopLevelCall = !_initializing;
    require(
      (isTopLevelCall && _initialized < 1) ||
        (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
      "Initializable: contract is already initialized"
    );
    _initialized = 1;
    if (isTopLevelCall) {
      _initializing = true;
    }
    _;
    if (isTopLevelCall) {
      _initializing = false;
      emit Initialized(1);
    }
  }

  /**
   * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
   * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
   * used to initialize parent contracts.
   *
   * `initializer` is equivalent to `reinitializer(1)`, so a reinitializer may be used after the original
   * initialization step. This is essential to configure modules that are added through upgrades and that require
   * initialization.
   *
   * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
   * a contract, executing them in the right order is up to the developer or operator.
   */
  modifier reinitializer(uint8 version) {
    require(
      !_initializing && _initialized < version,
      "Initializable: contract is already initialized"
    );
    _initialized = version;
    _initializing = true;
    _;
    _initializing = false;
    emit Initialized(version);
  }

  /**
   * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
   * {initializer} and {reinitializer} modifiers, directly or indirectly.
   */
  modifier onlyInitializing() {
    require(_initializing, "Initializable: contract is not initializing");
    _;
  }

  /**
   * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
   * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
   * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
   * through proxies.
   */
  function _disableInitializers() internal virtual {
    require(!_initializing, "Initializable: contract is initializing");
    if (_initialized < type(uint8).max) {
      _initialized = type(uint8).max;
      emit Initialized(type(uint8).max);
    }
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

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

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

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

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

  /**
   * @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: BUSL-1.1

      ▄▄█████████▄
   ╓██▀└ ,╓▄▄▄, '▀██▄
  ██▀ ▄██▀▀╙╙▀▀██▄ └██µ           ,,       ,,      ,     ,,,            ,,,
 ██ ,██¬ ▄████▄  ▀█▄ ╙█▄      ▄███▀▀███▄   ███▄    ██  ███▀▀▀███▄    ▄███▀▀███,
██  ██ ╒█▀'   ╙█▌ ╙█▌ ██     ▐██      ███  █████,  ██  ██▌    └██▌  ██▌     └██▌
██ ▐█▌ ██      ╟█  █▌ ╟█     ██▌      ▐██  ██ └███ ██  ██▌     ╟██ j██       ╟██
╟█  ██ ╙██    ▄█▀ ▐█▌ ██     ╙██      ██▌  ██   ╙████  ██▌    ▄██▀  ██▌     ,██▀
 ██ "██, ╙▀▀███████████⌐      ╙████████▀   ██     ╙██  ███████▀▀     ╙███████▀`
  ██▄ ╙▀██▄▄▄▄▄,,,                ¬─                                    '─¬
   ╙▀██▄ '╙╙╙▀▀▀▀▀▀▀▀
      ╙▀▀██████R⌐

 */
pragma solidity 0.8.16;

import "contracts/external/chainalysis/ISanctionsList.sol";

/**
 * @title ISanctionsListClient
 * @author Ondo Finance
 * @notice The client interface for sanctions contract.
 */
interface ISanctionsListClient {
  /// @notice Returns reference to the sanctions list that this client queries
  function sanctionsList() external view returns (ISanctionsList);

  /// @notice Sets the sanctions list reference
  function setSanctionsList(address sanctionsList) external;

  /// @notice Error for when caller attempts to set the `sanctionsList`
  ///         reference to the zero address
  error SanctionsListZeroAddress();

  /// @notice Error for when caller attempts to perform an action on a
  ///         sanctioned account
  error SanctionedAccount();

  /**
   * @dev Event for when the sanctions list reference is set
   *
   * @param oldSanctionsList The old list
   * @param newSanctionsList The new list
   */
  event SanctionsListSet(address oldSanctionsList, address newSanctionsList);
}

/// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.16;

interface ISanctionsList {
  function isSanctioned(address addr) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
  /**
   * @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
   * ====
   *
   * [IMPORTANT]
   * ====
   * You shouldn't rely on `isContract` to protect against flash loan attacks!
   *
   * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
   * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
   * constructor.
   * ====
   */
  function isContract(address account) internal view returns (bool) {
    // This method relies on extcodesize/address.code.length, which returns 0
    // for contracts in construction, since the code is only stored at the end
    // of the constructor execution.

    return account.code.length > 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");

    (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"
    );
    require(isContract(target), "Address: call to non-contract");

    (bool success, bytes memory returndata) = target.call{value: value}(data);
    return verifyCallResult(success, returndata, errorMessage);
  }

  /**
   * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
   * but performing a static call.
   *
   * _Available since v3.3._
   */
  function functionStaticCall(address target, bytes memory data)
    internal
    view
    returns (bytes memory)
  {
    return
      functionStaticCall(target, data, "Address: low-level static call failed");
  }

  /**
   * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
   * but performing a static call.
   *
   * _Available since v3.3._
   */
  function functionStaticCall(
    address target,
    bytes memory data,
    string memory errorMessage
  ) internal view returns (bytes memory) {
    require(isContract(target), "Address: static call to non-contract");

    (bool success, bytes memory returndata) = target.staticcall(data);
    return verifyCallResult(success, returndata, errorMessage);
  }

  /**
   * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
   * revert reason using the provided one.
   *
   * _Available since v4.3._
   */
  function verifyCallResult(
    bool success,
    bytes memory returndata,
    string memory errorMessage
  ) internal pure returns (bytes memory) {
    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
        /// @solidity memory-safe-assembly
        assembly {
          let returndata_size := mload(returndata)
          revert(add(32, returndata), returndata_size)
        }
      } else {
        revert(errorMessage);
      }
    }
  }
}

/**SPDX-License-Identifier: BUSL-1.1

      ▄▄█████████▄
   ╓██▀└ ,╓▄▄▄, '▀██▄
  ██▀ ▄██▀▀╙╙▀▀██▄ └██µ           ,,       ,,      ,     ,,,            ,,,
 ██ ,██¬ ▄████▄  ▀█▄ ╙█▄      ▄███▀▀███▄   ███▄    ██  ███▀▀▀███▄    ▄███▀▀███,
██  ██ ╒█▀'   ╙█▌ ╙█▌ ██     ▐██      ███  █████,  ██  ██▌    └██▌  ██▌     └██▌
██ ▐█▌ ██      ╟█  █▌ ╟█     ██▌      ▐██  ██ └███ ██  ██▌     ╟██ j██       ╟██
╟█  ██ ╙██    ▄█▀ ▐█▌ ██     ╙██      ██▌  ██   ╙████  ██▌    ▄██▀  ██▌     ,██▀
 ██ "██, ╙▀▀███████████⌐      ╙████████▀   ██     ╙██  ███████▀▀     ╙███████▀`
  ██▄ ╙▀██▄▄▄▄▄,,,                ¬─                                    '─¬
   ╙▀██▄ '╙╙╙▀▀▀▀▀▀▀▀
      ╙▀▀██████R⌐

 */
pragma solidity 0.8.16;

interface IBlocklist {
  function addToBlocklist(address[] calldata accounts) external;

  function removeFromBlocklist(address[] calldata accounts) external;

  function isBlocked(address account) external view returns (bool);

  /**
   * @notice Event emitted when addresses are added to the blocklist
   *
   * @param accounts The addresses that were added to the blocklist
   */
  event BlockedAddressesAdded(address[] accounts);

  /**
   * @notice Event emitted when addresses are removed from the blocklist
   *
   * @param accounts The addresses that were removed from the blocklist
   */
  event BlockedAddressesRemoved(address[] accounts);
}

/**SPDX-License-Identifier: BUSL-1.1

      ▄▄█████████▄
   ╓██▀└ ,╓▄▄▄, '▀██▄
  ██▀ ▄██▀▀╙╙▀▀██▄ └██µ           ,,       ,,      ,     ,,,            ,,,
 ██ ,██¬ ▄████▄  ▀█▄ ╙█▄      ▄███▀▀███▄   ███▄    ██  ███▀▀▀███▄    ▄███▀▀███,
██  ██ ╒█▀'   ╙█▌ ╙█▌ ██     ▐██      ███  █████,  ██  ██▌    └██▌  ██▌     └██▌
██ ▐█▌ ██      ╟█  █▌ ╟█     ██▌      ▐██  ██ └███ ██  ██▌     ╟██ j██       ╟██
╟█  ██ ╙██    ▄█▀ ▐█▌ ██     ╙██      ██▌  ██   ╙████  ██▌    ▄██▀  ██▌     ,██▀
 ██ "██, ╙▀▀███████████⌐      ╙████████▀   ██     ╙██  ███████▀▀     ╙███████▀`
  ██▄ ╙▀██▄▄▄▄▄,,,                ¬─                                    '─¬
   ╙▀██▄ '╙╙╙▀▀▀▀▀▀▀▀
      ╙▀▀██████R⌐

 */
pragma solidity 0.8.16;

import "contracts/interfaces/IBlocklist.sol";

/**
 * @title IBlocklistClient
 * @author Ondo Finance
 * @notice The client interface for the Blocklist contract.
 */
interface IBlocklistClient {
  /// @notice Returns reference to the blocklist that this client queries
  function blocklist() external view returns (IBlocklist);

  /// @notice Sets the blocklist reference
  function setBlocklist(address registry) external;

  /// @notice Error for when caller attempts to set the blocklist reference
  ///         to the zero address
  error BlocklistZeroAddress();

  /// @notice Error for when caller attempts to perform action on a blocked
  ///         account
  error BlockedAccount();

  /**
   * @dev Event for when the blocklist reference is set
   *
   * @param oldBlocklist The old blocklist
   * @param newBlocklist The new blocklist
   */
  event BlocklistSet(address oldBlocklist, address newBlocklist);
}

/**SPDX-License-Identifier: BUSL-1.1

      ▄▄█████████▄
   ╓██▀└ ,╓▄▄▄, '▀██▄
  ██▀ ▄██▀▀╙╙▀▀██▄ └██µ           ,,       ,,      ,     ,,,            ,,,
 ██ ,██¬ ▄████▄  ▀█▄ ╙█▄      ▄███▀▀███▄   ███▄    ██  ███▀▀▀███▄    ▄███▀▀███,
██  ██ ╒█▀'   ╙█▌ ╙█▌ ██     ▐██      ███  █████,  ██  ██▌    └██▌  ██▌     └██▌
██ ▐█▌ ██      ╟█  █▌ ╟█     ██▌      ▐██  ██ └███ ██  ██▌     ╟██ j██       ╟██
╟█  ██ ╙██    ▄█▀ ▐█▌ ██     ╙██      ██▌  ██   ╙████  ██▌    ▄██▀  ██▌     ,██▀
 ██ "██, ╙▀▀███████████⌐      ╙████████▀   ██     ╙██  ███████▀▀     ╙███████▀`
  ██▄ ╙▀██▄▄▄▄▄,,,                ¬─                                    '─¬
   ╙▀██▄ '╙╙╙▀▀▀▀▀▀▀▀
      ╙▀▀██████R⌐

 */
pragma solidity 0.8.16;

interface IAllowlist {
  function addTerm(string calldata term) external;

  function setCurrentTermIndex(uint256 _currentTermIndex) external;

  function setValidTermIndexes(uint256[] calldata indexes) external;

  function isAllowed(address account) external view returns (bool);

  function getCurrentTerm() external view returns (string memory);

  function currentTermIndex() external view returns (uint256);

  function getValidTermIndexes() external view returns (uint256[] memory);

  function addAccountToAllowlist(
    uint256 _currentTermIndex,
    address account,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external;

  function addSelfToAllowlist(uint256 termIndex) external;

  function setAccountStatus(
    address account,
    uint256 termIndex,
    bool status
  ) external;

  /**
   * @notice Event emitted when a term is added
   *
   * @param hashedMessage The hash of the terms string that was added
   * @param termIndex     The index of the term that was added
   */
  event TermAdded(bytes32 hashedMessage, uint256 termIndex);

  /**
   * @notice Event emitted when the current term index is set
   *
   * @param oldIndex The old current term index
   * @param newIndex The new current term index
   */
  event CurrentTermIndexSet(uint256 oldIndex, uint256 newIndex);

  /**
   * @notice Event emitted when the valid term indexes are set
   *
   * @param oldIndexes The old valid term indexes
   * @param newIndexes The new valid term indexes
   */
  event ValidTermIndexesSet(uint256[] oldIndexes, uint256[] newIndexes);

  /**
   * @notice Event emitted when an accoun status is set by an admin
   *
   * @param account   The account whose status was set
   * @param termIndex The term index of the account whose status that was set
   * @param status    The new status of the account
   */
  event AccountStatusSetByAdmin(
    address indexed account,
    uint256 indexed termIndex,
    bool status
  );

  /**
   * @notice Event emitted when an account adds itself added to the allowlist
   *
   * @param account   The account that was added
   * @param termIndex The term index for which the account was added
   */
  event AccountAddedSelf(address indexed account, uint256 indexed termIndex);

  /**
   * @notice Event emitted when an account is added to the allowlist by a signature
   *
   * @param account   The account that was added
   * @param termIndex The term index for which the account was added
   * @param v         The v value of the signature
   * @param r         The r value of the signature
   * @param s         The s value of the signature
   */
  event AccountAddedFromSignature(
    address indexed account,
    uint256 indexed termIndex,
    uint8 v,
    bytes32 r,
    bytes32 s
  );

  /**
   * @notice Event emitted when an account status is set
   *
   * @param account   The account whose status was set
   * @param termIndex The term index of the account whose status was set
   * @param status    The new status of the account
   */
  event AccountStatusSet(
    address indexed account,
    uint256 indexed termIndex,
    bool status
  );

  /// ERRORS ///
  error InvalidTermIndex();
  error InvalidVSignature();
  error AlreadyVerified();
  error InvalidSigner();
}

/**SPDX-License-Identifier: BUSL-1.1

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pragma solidity 0.8.16;

import "contracts/interfaces/IAllowlist.sol";

/**
 * @title IAllowlistClient
 * @author Ondo Finance
 * @notice The client interface for Ondo's Allowlist contract.
 */
interface IAllowlistClient {
  /// @notice Returns reference to the allowlist that this client queries
  function allowlist() external view returns (IAllowlist);

  /// @notice Sets the allowlist contract reference
  function setAllowlist(address allowlist) external;

  /**
   * @dev Event for when the allowlist reference is set
   *
   * @param oldAllowlist The old allowlist
   * @param newAllowlist The new allowlist
   */
  event AllowlistSet(address oldAllowlist, address newAllowlist);

  /// @notice Error for when caller attempts to set the allowlist reference
  ///         to the zero address.
  error AllowlistZeroAddress();
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/structs/EnumerableSet.sol)

pragma solidity ^0.8.0;

/**
 * @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 v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 *
 * [WARNING]
 * ====
 *  Trying to delete such a structure from storage will likely result in data corruption, rendering the structure unusable.
 *  See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.
 *
 *  In order to clean an EnumerableSet, you can either remove all elements one by one or create a fresh instance using an array of EnumerableSet.
 * ====
 */
library EnumerableSetUpgradeable {
  // 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;

      if (lastIndex != toDeleteIndex) {
        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] = valueIndex; // Replace lastValue's index to valueIndex
      }

      // 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) {
    return set._values[index];
  }

  /**
   * @dev Return the entire set in an array
   *
   * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
   * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
   * this function has an unbounded cost, and using it as part of a state-changing function may render the function
   * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
   */
  function _values(Set storage set) private view returns (bytes32[] memory) {
    return set._values;
  }

  // Bytes32Set

  struct Bytes32Set {
    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(Bytes32Set storage set, bytes32 value) internal returns (bool) {
    return _add(set._inner, 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(Bytes32Set storage set, bytes32 value)
    internal
    returns (bool)
  {
    return _remove(set._inner, value);
  }

  /**
   * @dev Returns true if the value is in the set. O(1).
   */
  function contains(Bytes32Set storage set, bytes32 value)
    internal
    view
    returns (bool)
  {
    return _contains(set._inner, value);
  }

  /**
   * @dev Returns the number of values in the set. O(1).
   */
  function length(Bytes32Set 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(Bytes32Set storage set, uint256 index)
    internal
    view
    returns (bytes32)
  {
    return _at(set._inner, index);
  }

  /**
   * @dev Return the entire set in an array
   *
   * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
   * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
   * this function has an unbounded cost, and using it as part of a state-changing function may render the function
   * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
   */
  function values(Bytes32Set storage set)
    internal
    view
    returns (bytes32[] memory)
  {
    return _values(set._inner);
  }

  // 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(uint160(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(uint160(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(uint160(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(uint160(uint256(_at(set._inner, index))));
  }

  /**
   * @dev Return the entire set in an array
   *
   * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
   * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
   * this function has an unbounded cost, and using it as part of a state-changing function may render the function
   * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
   */
  function values(AddressSet storage set)
    internal
    view
    returns (address[] memory)
  {
    bytes32[] memory store = _values(set._inner);
    address[] memory result;

    /// @solidity memory-safe-assembly
    assembly {
      result := store
    }

    return result;
  }

  // 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 Return the entire set in an array
   *
   * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
   * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
   * this function has an unbounded cost, and using it as part of a state-changing function may render the function
   * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
   */
  function values(UintSet storage set)
    internal
    view
    returns (uint256[] memory)
  {
    bytes32[] memory store = _values(set._inner);
    uint256[] memory result;

    /// @solidity memory-safe-assembly
    assembly {
      result := store
    }

    return result;
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/AccessControl.sol)

pragma solidity ^0.8.0;

import "contracts/external/openzeppelin/contracts-upgradeable/access/IAccessControlUpgradeable.sol";
import "contracts/external/openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol";
import "contracts/external/openzeppelin/contracts-upgradeable/utils/StringsUpgradeable.sol";
import "contracts/external/openzeppelin/contracts-upgradeable/utils/ERC165Upgradeable.sol";
import "contracts/external/openzeppelin/contracts-upgradeable/proxy/Initializable.sol";

/**
 * @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 AccessControlUpgradeable is
  Initializable,
  ContextUpgradeable,
  IAccessControlUpgradeable,
  ERC165Upgradeable
{
  function __AccessControl_init() internal onlyInitializing {}

  function __AccessControl_init_unchained() internal onlyInitializing {}

  struct RoleData {
    mapping(address => bool) members;
    bytes32 adminRole;
  }

  mapping(bytes32 => RoleData) private _roles;

  bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

  /**
   * @dev Modifier that checks that an account has a specific role. Reverts
   * with a standardized message including the required role.
   *
   * The format of the revert reason is given by the following regular expression:
   *
   *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
   *
   * _Available since v4.1._
   */
  modifier onlyRole(bytes32 role) {
    _checkRole(role);
    _;
  }

  /**
   * @dev See {IERC165-supportsInterface}.
   */
  function supportsInterface(bytes4 interfaceId)
    public
    view
    virtual
    override
    returns (bool)
  {
    return
      interfaceId == type(IAccessControlUpgradeable).interfaceId ||
      super.supportsInterface(interfaceId);
  }

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

  /**
   * @dev Revert with a standard message if `_msgSender()` is missing `role`.
   * Overriding this function changes the behavior of the {onlyRole} modifier.
   *
   * Format of the revert message is described in {_checkRole}.
   *
   * _Available since v4.6._
   */
  function _checkRole(bytes32 role) internal view virtual {
    _checkRole(role, _msgSender());
  }

  /**
   * @dev Revert with a standard message if `account` is missing `role`.
   *
   * The format of the revert reason is given by the following regular expression:
   *
   *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
   */
  function _checkRole(bytes32 role, address account) internal view virtual {
    if (!hasRole(role, account)) {
      revert(
        string(
          abi.encodePacked(
            "AccessControl: account ",
            StringsUpgradeable.toHexString(uint160(account), 20),
            " is missing role ",
            StringsUpgradeable.toHexString(uint256(role), 32)
          )
        )
      );
    }
  }

  /**
   * @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
    virtual
    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.
   *
   * May emit a {RoleGranted} event.
   */
  function grantRole(bytes32 role, address account)
    public
    virtual
    override
    onlyRole(getRoleAdmin(role))
  {
    _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.
   *
   * May emit a {RoleRevoked} event.
   */
  function revokeRole(bytes32 role, address account)
    public
    virtual
    override
    onlyRole(getRoleAdmin(role))
  {
    _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 revoked `role`, emits a {RoleRevoked}
   * event.
   *
   * Requirements:
   *
   * - the caller must be `account`.
   *
   * May emit a {RoleRevoked} event.
   */
  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.
   *
   * May emit a {RoleGranted} event.
   *
   * [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}.
   * ====
   *
   * NOTE: This function is deprecated in favor of {_grantRole}.
   */
  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 {
    bytes32 previousAdminRole = getRoleAdmin(role);
    _roles[role].adminRole = adminRole;
    emit RoleAdminChanged(role, previousAdminRole, adminRole);
  }

  /**
   * @dev Grants `role` to `account`.
   *
   * Internal function without access restriction.
   *
   * May emit a {RoleGranted} event.
   */
  function _grantRole(bytes32 role, address account) internal virtual {
    if (!hasRole(role, account)) {
      _roles[role].members[account] = true;
      emit RoleGranted(role, account, _msgSender());
    }
  }

  /**
   * @dev Revokes `role` from `account`.
   *
   * Internal function without access restriction.
   *
   * May emit a {RoleRevoked} event.
   */
  function _revokeRole(bytes32 role, address account) internal virtual {
    if (hasRole(role, account)) {
      _roles[role].members[account] = false;
      emit RoleRevoked(role, account, _msgSender());
    }
  }

  /**
   * @dev This empty reserved space is put in place to allow future versions to add new
   * variables without shifting down storage in the inheritance chain.
   * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
   */
  uint256[49] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControlEnumerable.sol)

pragma solidity ^0.8.0;

import "./IAccessControlUpgradeable.sol";

/**
 * @dev External interface of AccessControlEnumerable declared to support ERC165 detection.
 */
interface IAccessControlEnumerableUpgradeable is IAccessControlUpgradeable {
  /**
   * @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)
    external
    view
    returns (address);

  /**
   * @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) external view returns (uint256);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControlUpgradeable {
  /**
   * @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 {AccessControl-_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) external view returns (bool);

  /**
   * @dev Returns the admin role that controls `role`. See {grantRole} and
   * {revokeRole}.
   *
   * To change a role's admin, use {AccessControl-_setRoleAdmin}.
   */
  function getRoleAdmin(bytes32 role) external view returns (bytes32);

  /**
   * @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) external;

  /**
   * @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) external;

  /**
   * @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) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "contracts/external/openzeppelin/contracts-upgradeable/utils/IERC165Upgradeable.sol";
import "contracts/external/openzeppelin/contracts-upgradeable/proxy/Initializable.sol";

/**
 * @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 ERC165Upgradeable is Initializable, IERC165Upgradeable {
  function __ERC165_init() internal onlyInitializing {}

  function __ERC165_init_unchained() internal onlyInitializing {}

  /**
   * @dev See {IERC165-supportsInterface}.
   */
  function supportsInterface(bytes4 interfaceId)
    public
    view
    virtual
    override
    returns (bool)
  {
    return interfaceId == type(IERC165Upgradeable).interfaceId;
  }

  /**
   * @dev This empty reserved space is put in place to allow future versions to add new
   * variables without shifting down storage in the inheritance chain.
   * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
   */
  uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library StringsUpgradeable {
  bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
  uint8 private constant _ADDRESS_LENGTH = 20;

  /**
   * @dev Converts a `uint256` to its ASCII `string` decimal representation.
   */
  function toString(uint256 value) internal pure returns (string memory) {
    // Inspired by OraclizeAPI's implementation - MIT licence
    // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

    if (value == 0) {
      return "0";
    }
    uint256 temp = value;
    uint256 digits;
    while (temp != 0) {
      digits++;
      temp /= 10;
    }
    bytes memory buffer = new bytes(digits);
    while (value != 0) {
      digits -= 1;
      buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
      value /= 10;
    }
    return string(buffer);
  }

  /**
   * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
   */
  function toHexString(uint256 value) internal pure returns (string memory) {
    if (value == 0) {
      return "0x00";
    }
    uint256 temp = value;
    uint256 length = 0;
    while (temp != 0) {
      length++;
      temp >>= 8;
    }
    return toHexString(value, length);
  }

  /**
   * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
   */
  function toHexString(uint256 value, uint256 length)
    internal
    pure
    returns (string memory)
  {
    bytes memory buffer = new bytes(2 * length + 2);
    buffer[0] = "0";
    buffer[1] = "x";
    for (uint256 i = 2 * length + 1; i > 1; --i) {
      buffer[i] = _HEX_SYMBOLS[value & 0xf];
      value >>= 4;
    }
    require(value == 0, "Strings: hex length insufficient");
    return string(buffer);
  }

  /**
   * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
   */
  function toHexString(address addr) internal pure returns (string memory) {
    return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @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 IERC165Upgradeable {
  /**
   * @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);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 100
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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