Contract 0x926afba2fda87fc4e0287ede093f8293b24ee59c

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import './interfaces/IPublicLock.sol';
import '@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol';
import '@openzeppelin/contracts-upgradeable/utils/introspection/ERC165StorageUpgradeable.sol';
import './mixins/MixinDisable.sol';
import './mixins/MixinERC721Enumerable.sol';
import './mixins/MixinFunds.sol';
import './mixins/MixinGrantKeys.sol';
import './mixins/MixinKeys.sol';
import './mixins/MixinLockCore.sol';
import './mixins/MixinLockMetadata.sol';
import './mixins/MixinPurchase.sol';
import './mixins/MixinRefunds.sol';
import './mixins/MixinTransfer.sol';
import './mixins/MixinRoles.sol';


/**
 * @title The Lock contract
 * @author Julien Genestoux (unlock-protocol.com)
 * @dev ERC165 allows our contract to be queried to determine whether it implements a given interface.
 * Every ERC-721 compliant contract must implement the ERC165 interface.
 * https://eips.ethereum.org/EIPS/eip-721
 */
contract PublicLock is
  Initializable,
  ERC165StorageUpgradeable,
  MixinRoles,
  MixinFunds,
  MixinDisable,
  MixinLockCore,
  MixinKeys,
  MixinLockMetadata,
  MixinERC721Enumerable,
  MixinGrantKeys,
  MixinPurchase,
  MixinTransfer,
  MixinRefunds
{
  function initialize(
    address payable _lockCreator,
    uint _expirationDuration,
    address _tokenAddress,
    uint _keyPrice,
    uint _maxNumberOfKeys,
    string calldata _lockName
  ) public
    initializer()
  {
    MixinFunds._initializeMixinFunds(_tokenAddress);
    MixinDisable._initializeMixinDisable();
    MixinLockCore._initializeMixinLockCore(_lockCreator, _expirationDuration, _keyPrice, _maxNumberOfKeys);
    MixinLockMetadata._initializeMixinLockMetadata(_lockName);
    MixinERC721Enumerable._initializeMixinERC721Enumerable();
    MixinRefunds._initializeMixinRefunds();
    MixinRoles._initializeMixinRoles(_lockCreator);
    // registering the interface for erc721 with ERC165.sol using
    // the ID specified in the standard: https://eips.ethereum.org/EIPS/eip-721
    _registerInterface(0x80ac58cd);
  }

  /**
   * @notice Allow the contract to accept tips in ETH sent directly to the contract.
   * @dev This is okay to use even if the lock is priced in ERC-20 tokens
   */
  receive() external payable {}
  
  /**
   Overrides
  */
  function supportsInterface(bytes4 interfaceId) 
    public 
    view 
    virtual 
    override(
      MixinERC721Enumerable,
      MixinLockMetadata,
      AccessControlUpgradeable, 
      ERC165StorageUpgradeable
    ) 
    returns (bool) 
    {
    return super.supportsInterface(interfaceId);
  }

}

// SPDX-License-Identifier: MIT
pragma solidity >=0.5.17 <0.9.0;

/**
* @title The PublicLock Interface
* @author Nick Furfaro (unlock-protocol.com)
 */


interface IPublicLock
{

// See indentationissue description here:
// https://github.com/duaraghav8/Ethlint/issues/268
// solium-disable indentation

  /// Functions
  function initialize(
    address _lockCreator,
    uint _expirationDuration,
    address _tokenAddress,
    uint _keyPrice,
    uint _maxNumberOfKeys,
    string calldata _lockName
  ) external;

  /**
   * @notice Allow the contract to accept tips in ETH sent directly to the contract.
   * @dev This is okay to use even if the lock is priced in ERC-20 tokens
   */
  // receive() external payable;

  // roles
  function DEFAULT_ADMIN_ROLE() external pure returns (bytes32);
  function KEY_GRANTER_ROLE() external pure returns (bytes32);
  function LOCK_MANAGER_ROLE() external pure returns (bytes32);

  /**
  * @notice The version number of the current implementation on this network.
  * @return The current version number.
  */
  function publicLockVersion() external pure returns (uint16);

  /**
  * @notice Used to disable lock before migrating keys and/or destroying contract.
  * @dev Throws if called by other than a lock manager.
  * @dev Throws if lock contract has already been disabled.
  */
  function disableLock() external;

  /**
   * @dev Called by a lock manager or beneficiary to withdraw all funds from the lock and send them to the `beneficiary`.
   * @dev Throws if called by other than a lock manager or beneficiary
   * @param _tokenAddress specifies the token address to withdraw or 0 for ETH. This is usually
   * the same as `tokenAddress` in MixinFunds.
   * @param _amount specifies the max amount to withdraw, which may be reduced when
   * considering the available balance. Set to 0 or MAX_UINT to withdraw everything.
   *  -- however be wary of draining funds as it breaks the `cancelAndRefund` and `expireAndRefundFor`
   * use cases.
   */
  function withdraw(
    address _tokenAddress,
    uint _amount
  ) external;

  /**
   * @notice An ERC-20 style approval, allowing the spender to transfer funds directly from this lock.
   */
  function approveBeneficiary(
    address _spender,
    uint _amount
  ) external
    returns (bool);

  /**
   * A function which lets a Lock manager of the lock to change the price for future purchases.
   * @dev Throws if called by other than a Lock manager
   * @dev Throws if lock has been disabled
   * @dev Throws if _tokenAddress is not a valid token
   * @param _keyPrice The new price to set for keys
   * @param _tokenAddress The address of the erc20 token to use for pricing the keys,
   * or 0 to use ETH
   */
  function updateKeyPricing( uint _keyPrice, address _tokenAddress ) external;

  /**
   * A function to change the default duration of each key in the lock
   * @notice keys previously bought are unaffected by this change (i.e.
   * existing keys timestamps are not recalculated/updated)
   * @param _newExpirationDuration the new amount of time for each key purchased 
   * or zero (0) for a non-expiring key
   */
  function setExpirationDuration(uint _newExpirationDuration) external;

  /**
   * A function which lets a Lock manager update the beneficiary account,
   * which receives funds on withdrawal.
   * @dev Throws if called by other than a Lock manager or beneficiary
   * @dev Throws if _beneficiary is address(0)
   * @param _beneficiary The new address to set as the beneficiary
   */
  function updateBeneficiary( address _beneficiary ) external;

  /**
   * Checks if the user has a non-expired key.
   * @param _user The address of the key owner
   */
  function getHasValidKey(
    address _user
  ) external view returns (bool);

  /**
   * @notice Find the tokenId for a given user
   * @return The tokenId of the NFT, else returns 0
   * @param _account The address of the key owner
  */
  function getTokenIdFor(
    address _account
  ) external view returns (uint);

  /**
  * @dev Returns the key's ExpirationTimestamp field for a given owner.
  * @param _keyOwner address of the user for whom we search the key
  * @dev Returns 0 if the owner has never owned a key for this lock
  */
  function keyExpirationTimestampFor(
    address _keyOwner
  ) external view returns (uint timestamp);
  
  /**
   * Public function which returns the total number of unique owners (both expired
   * and valid).  This may be larger than totalSupply.
   */
  function numberOfOwners() external view returns (uint);

  /**
   * Allows a Lock manager to assign a descriptive name for this Lock.
   * @param _lockName The new name for the lock
   * @dev Throws if called by other than a Lock manager
   */
  function updateLockName(
    string calldata _lockName
  ) external;

  /**
   * Allows a Lock manager to assign a Symbol for this Lock.
   * @param _lockSymbol The new Symbol for the lock
   * @dev Throws if called by other than a Lock manager
   */
  function updateLockSymbol(
    string calldata _lockSymbol
  ) external;

  /**
    * @dev Gets the token symbol
    * @return string representing the token symbol
    */
  function symbol()
    external view
    returns(string memory);

    /**
   * Allows a Lock manager to update the baseTokenURI for this Lock.
   * @dev Throws if called by other than a Lock manager
   * @param _baseTokenURI String representing the base of the URI for this lock.
   */
  function setBaseTokenURI(
    string calldata _baseTokenURI
  ) external;

  /**  @notice A distinct Uniform Resource Identifier (URI) for a given asset.
   * @dev Throws if `_tokenId` is not a valid NFT. URIs are defined in RFC
   *  3986. The URI may point to a JSON file that conforms to the "ERC721
   *  Metadata JSON Schema".
   * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
   * @param _tokenId The tokenID we're inquiring about
   * @return String representing the URI for the requested token
   */
  function tokenURI(
    uint256 _tokenId
  ) external view returns(string memory);

  /**
   * @notice Allows a Lock manager to add or remove an event hook
   */
  function setEventHooks(
    address _onKeyPurchaseHook,
    address _onKeyCancelHook,
    address _onValidKeyHook,
    address _onTokenURIHook
  ) external;

  /**
   * Allows a Lock manager to give a collection of users a key with no charge.
   * Each key may be assigned a different expiration date.
   * @dev Throws if called by other than a Lock manager
   * @param _recipients An array of receiving addresses
   * @param _expirationTimestamps An array of expiration Timestamps for the keys being granted
   */
  function grantKeys(
    address[] calldata _recipients,
    uint[] calldata _expirationTimestamps,
    address[] calldata _keyManagers
  ) external;

  /**
  * @dev Purchase function
  * @param _value the number of tokens to pay for this purchase >= the current keyPrice - any applicable discount
  * (_value is ignored when using ETH)
  * @param _recipient address of the recipient of the purchased key
  * @param _referrer address of the user making the referral
  * @param _keyManager optional address to grant managing rights to a specific address on creation
  * @param _data arbitrary data populated by the front-end which initiated the sale
  * @dev Throws if lock is disabled. Throws if lock is sold-out. Throws if _recipient == address(0).
  * @dev Setting _value to keyPrice exactly doubles as a security feature. That way if a Lock manager increases the
  * price while my transaction is pending I can't be charged more than I expected (only applicable to ERC-20 when more
  * than keyPrice is approved for spending).
  */
  function purchase(
    uint256 _value,
    address _recipient,
    address _referrer,
    address _keyManager,
    bytes calldata _data
  ) external payable;

  /**
  * @param _gasRefundValue price in wei or token in smallest price unit
  * @dev Set the value to be refunded to the sender on purchase
  */
  function setGasRefundValue(uint256 _gasRefundValue) external;
  
  /**
  * _gasRefundValue price in wei or token in smallest price unit
  * @dev Returns the value/rpice to be refunded to the sender on purchase
  */
  function gasRefundValue() external view returns (uint256 _gasRefundValue);

  /**
   * @notice returns the minimum price paid for a purchase with these params.
   * @dev this considers any discount from Unlock or the OnKeyPurchase hook.
   */
  function purchasePriceFor(
    address _recipient,
    address _referrer,
    bytes calldata _data
  ) external view
    returns (uint);

  /**
   * Allow a Lock manager to change the transfer fee.
   * @dev Throws if called by other than a Lock manager
   * @param _transferFeeBasisPoints The new transfer fee in basis-points(bps).
   * Ex: 200 bps = 2%
   */
  function updateTransferFee(
    uint _transferFeeBasisPoints
  ) external;

  /**
   * Determines how much of a fee a key owner would need to pay in order to
   * transfer the key to another account.  This is pro-rated so the fee goes down
   * overtime.
   * @dev Throws if _keyOwner does not have a valid key
   * @param _keyOwner The owner of the key check the transfer fee for.
   * @param _time The amount of time to calculate the fee for.
   * @return The transfer fee in seconds.
   */
  function getTransferFee(
    address _keyOwner,
    uint _time
  ) external view returns (uint);

  /**
   * @dev Invoked by a Lock manager to expire the user's key and perform a refund and cancellation of the key
   * @param _keyOwner The key owner to whom we wish to send a refund to
   * @param amount The amount to refund the key-owner
   * @dev Throws if called by other than a Lock manager
   * @dev Throws if _keyOwner does not have a valid key
   */
  function expireAndRefundFor(
    address _keyOwner,
    uint amount
  ) external;

   /**
   * @dev allows the key manager to expire a given tokenId
   * and send a refund to the keyOwner based on the amount of time remaining.
   * @param _tokenId The id of the key to cancel.
   */
  function cancelAndRefund(uint _tokenId) external;

  /**
   * Allow a Lock manager to change the refund penalty.
   * @dev Throws if called by other than a Lock manager
   * @param _freeTrialLength The new duration of free trials for this lock
   * @param _refundPenaltyBasisPoints The new refund penaly in basis-points(bps)
   */
  function updateRefundPenalty(
    uint _freeTrialLength,
    uint _refundPenaltyBasisPoints
  ) external;

  /**
   * @dev Determines how much of a refund a key owner would receive if they issued
   * @param _keyOwner The key owner to get the refund value for.
   * a cancelAndRefund block.timestamp.
   * Note that due to the time required to mine a tx, the actual refund amount will be lower
   * than what the user reads from this call.
   */
  function getCancelAndRefundValueFor(
    address _keyOwner
  ) external view returns (uint refund);

  function addKeyGranter(address account) external;

  function addLockManager(address account) external;

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

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

  function onKeyPurchaseHook() external view returns(address);

  function onKeyCancelHook() external view returns(address);
  
  function onValidKeyHook() external view returns(bool);

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

  function revokeKeyGranter(address _granter) external;

  function renounceLockManager() external;

  /**
   * @dev Change the maximum number of keys the lock can edit
   * @param _maxNumberOfKeys uint the maximum number of keys
   */
  function setMaxNumberOfKeys (uint _maxNumberOfKeys) external;

  ///===================================================================
  /// Auto-generated getter functions from public state variables

  function beneficiary() external view returns (address );

  function expirationDuration() external view returns (uint256 );

  function freeTrialLength() external view returns (uint256 );

  function isAlive() external view returns (bool );

  function keyPrice() external view returns (uint256 );

  function maxNumberOfKeys() external view returns (uint256 );

  function refundPenaltyBasisPoints() external view returns (uint256 );

  function tokenAddress() external view returns (address );

  function transferFeeBasisPoints() external view returns (uint256 );

  function unlockProtocol() external view returns (address );

  function keyManagerOf(uint) external view returns (address );

  ///===================================================================

  /**
  * @notice Allows the key owner to safely share their key (parent key) by
  * transferring a portion of the remaining time to a new key (child key).
  * @dev Throws if key is not valid.
  * @dev Throws if `_to` is the zero address
  * @param _to The recipient of the shared key
  * @param _tokenId the key to share
  * @param _timeShared The amount of time shared
  * checks if `_to` is a smart contract (code size > 0). If so, it calls
  * `onERC721Received` on `_to` and throws if the return value is not
  * `bytes4(keccak256('onERC721Received(address,address,uint,bytes)'))`.
  * @dev Emit Transfer event
  */
  function shareKey(
    address _to,
    uint _tokenId,
    uint _timeShared
  ) external;

  /**
  * @notice Update transfer and cancel rights for a given key
  * @param _tokenId The id of the key to assign rights for
  * @param _keyManager The address to assign the rights to for the given key
  */
  function setKeyManagerOf(
    uint _tokenId,
    address _keyManager
  ) external;

  /// @notice A descriptive name for a collection of NFTs in this contract
  function name() external view returns (string memory _name);
  ///===================================================================

  /// From ERC165.sol
  function supportsInterface(bytes4 interfaceId) external view returns (bool);
  ///===================================================================

  /// From ERC-721
  /**
     * @dev Returns the number of NFTs in `owner`'s account.
     */
    function balanceOf(address _owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the NFT specified by `tokenId`.
     */
    function ownerOf(uint256 tokenId) external view returns (address _owner);

    /**
     * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
     * another (`to`).
     *
     * Requirements:
     * - `from`, `to` cannot be zero.
     * - `tokenId` must be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this
     * NFT by either {approve} or {setApprovalForAll}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) external;
    
    /**
     * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
     * another (`to`).
     *
     * Requirements:
     * - If the caller is not `from`, it must be approved to move this NFT by
     * either {approve} or {setApprovalForAll}.
     */
    function transferFrom(address from, address to, uint256 tokenId) external;
    function approve(address to, uint256 tokenId) external;

    /**
    * @notice Get the approved address for a single NFT
    * @dev Throws if `_tokenId` is not a valid NFT.
    * @param _tokenId The NFT to find the approved address for
    * @return operator The approved address for this NFT, or the zero address if there is none
    */
    function getApproved(uint256 _tokenId) external view returns (address operator);

    function setApprovalForAll(address operator, bool _approved) external;
    function isApprovedForAll(address _owner, address operator) external view returns (bool);

    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;

    function totalSupply() external view returns (uint256);
    function tokenOfOwnerByIndex(address _owner, uint256 index) external view returns (uint256 tokenId);

    function tokenByIndex(uint256 index) external view returns (uint256);

    /**
    * Innherited from Open Zeppelin AccessControl.sol
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);
    function grantRole(bytes32 role, address account) external;
    function revokeRole(bytes32 role, address account) external;
    function renounceRole(bytes32 role, address account) external;
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @notice An ERC-20 style transfer.
     * @param _value sends a token with _value * expirationDuration (the amount of time remaining on a standard purchase).
     * @dev The typical use case would be to call this with _value 1, which is on par with calling `transferFrom`. If the user
     * has more than `expirationDuration` time remaining this may use the `shareKey` function to send some but not all of the token.
     */
    function transfer(
      address _to,
      uint _value
    ) external
      returns (bool success);
}

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

pragma solidity ^0.8.0;

import "../../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 a proxied contract can't have 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.
 *
 * 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 initialize the implementation contract, you can either invoke the
 * initializer manually, or you can include a constructor to automatically mark it as initialized when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() initializer {}
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

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

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        // If the contract is initializing we ignore whether _initialized is set in order to support multiple
        // inheritance patterns, but we only do this in the context of a constructor, because in other contexts the
        // contract may have been reentered.
        require(_initializing ? _isConstructor() : !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

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

    function _isConstructor() private view returns (bool) {
        return !AddressUpgradeable.isContract(address(this));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165Storage.sol)

pragma solidity ^0.8.0;

import "./ERC165Upgradeable.sol";
import "../../proxy/utils/Initializable.sol";

/**
 * @dev Storage based implementation of the {IERC165} interface.
 *
 * Contracts may inherit from this and call {_registerInterface} to declare
 * their support of an interface.
 */
abstract contract ERC165StorageUpgradeable is Initializable, ERC165Upgradeable {
    function __ERC165Storage_init() internal onlyInitializing {
        __ERC165_init_unchained();
        __ERC165Storage_init_unchained();
    }

    function __ERC165Storage_init_unchained() internal onlyInitializing {
    }
    /**
     * @dev Mapping of interface ids to whether or not it's supported.
     */
    mapping(bytes4 => bool) private _supportedInterfaces;

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

    /**
     * @dev Registers the contract as an implementer of the interface defined by
     * `interfaceId`. Support of the actual ERC165 interface is automatic and
     * registering its interface id is not required.
     *
     * See {IERC165-supportsInterface}.
     *
     * Requirements:
     *
     * - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`).
     */
    function _registerInterface(bytes4 interfaceId) internal virtual {
        require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
        _supportedInterfaces[interfaceId] = true;
    }
    uint256[49] private __gap;
}

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

import './MixinFunds.sol';
import './MixinRoles.sol';

/**
 * @title Mixin allowing the Lock owner to disable a Lock (preventing new purchases)
 * and then destroy it.
 * @author HardlyDifficult
 * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
 * separates logically groupings of code to ease readability.
 */
contract MixinDisable is
  MixinRoles,
  MixinFunds
{
  // Used to disable payable functions when deprecating an old lock
  bool public isAlive;

  event Disable();

  function _initializeMixinDisable(
  ) internal
  {
    isAlive = true;
  }

  // Only allow usage when contract is Alive
  modifier onlyIfAlive() {
    require(isAlive, 'LOCK_DEPRECATED');
    _;
  }

  /**
  * @dev Used to disable lock before migrating keys and/or destroying contract
   */
  function disableLock()
    external
    onlyLockManager
    onlyIfAlive
  {
    emit Disable();
    isAlive = false;
  }
  
  uint256[1000] private __safe_upgrade_gap;
}

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

import './MixinKeys.sol';
import './MixinLockCore.sol';
// import '@openzeppelin/contracts-upgradeable/token/ERC721/extensions/IERC721EnumerableUpgradeable.sol';
import '@openzeppelin/contracts-upgradeable/utils/introspection/ERC165StorageUpgradeable.sol';


/**
 * @title Implements the ERC-721 Enumerable extension.
 */
contract MixinERC721Enumerable is
  ERC165StorageUpgradeable,
  MixinLockCore, // Implements totalSupply
  MixinKeys
{
  function _initializeMixinERC721Enumerable() internal
  {
    /**
     * register the supported interface to conform to ERC721Enumerable via ERC165
     * 0x780e9d63 ===
     *     bytes4(keccak256('totalSupply()')) ^
     *     bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) ^
     *     bytes4(keccak256('tokenByIndex(uint256)'))
     */
    _registerInterface(0x780e9d63);
  }

  /// @notice Enumerate valid NFTs
  /// @dev Throws if `_index` >= `totalSupply()`.
  /// @param _index A counter less than `totalSupply()`
  /// @return The token identifier for the `_index`th NFT,
  ///  (sort order not specified)
  function tokenByIndex(
    uint256 _index
  ) public view
    returns (uint256)
  {
    require(_index < _totalSupply, 'OUT_OF_RANGE');
    return _index;
  }

  /// @notice Enumerate NFTs assigned to an owner
  /// @dev Throws if `_index` >= `balanceOf(_keyOwner)` or if
  ///  `_keyOwner` is the zero address, representing invalid NFTs.
  /// @param _keyOwner An address where we are interested in NFTs owned by them
  /// @param _index A counter less than `balanceOf(_keyOwner)`
  /// @return The token identifier for the `_index`th NFT assigned to `_keyOwner`,
  ///   (sort order not specified)
  function tokenOfOwnerByIndex(
    address _keyOwner,
    uint256 _index
  ) public view
    returns (uint256)
  {
    require(_index < balanceOf(_keyOwner) && _keyOwner != address(0), 'ONLY_ONE_KEY_PER_OWNER');
    return getTokenIdFor(_keyOwner);
  }

  function supportsInterface(bytes4 interfaceId) 
    public 
    view 
    virtual 
    override(
      AccessControlUpgradeable,
      ERC165StorageUpgradeable
    ) 
    returns (bool) 
    {
    return super.supportsInterface(interfaceId);
  }
  
  uint256[1000] private __safe_upgrade_gap;
}

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

import '@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol';
import '@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol';
import '@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol';


/**
 * @title An implementation of the money related functions.
 * @author HardlyDifficult (unlock-protocol.com)
 */
contract MixinFunds
{
  using AddressUpgradeable for address payable;
  using SafeERC20Upgradeable for IERC20Upgradeable;

  /**
   * The token-type that this Lock is priced in.  If 0, then use ETH, else this is
   * a ERC20 token address.
   */
  address public tokenAddress;

  function _initializeMixinFunds(
    address _tokenAddress
  ) internal
  {
    tokenAddress = _tokenAddress;
    require(
      _tokenAddress == address(0) || IERC20Upgradeable(_tokenAddress).totalSupply() > 0,
      'INVALID_TOKEN'
    );
  }

  /**
   * Transfers funds from the contract to the account provided.
   *
   * Security: be wary of re-entrancy when calling this function.
   */
  function _transfer(
    address _tokenAddress,
    address payable _to,
    uint _amount
  ) internal
  {
    if(_amount > 0) {
      if(_tokenAddress == address(0)) {
        // https://diligence.consensys.net/blog/2019/09/stop-using-soliditys-transfer-now/
        _to.sendValue(_amount);
      } else {
        IERC20Upgradeable token = IERC20Upgradeable(_tokenAddress);
        token.safeTransfer(_to, _amount);
      }
    }
  }

  uint256[1000] private __safe_upgrade_gap;
}

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

import './MixinKeys.sol';
import './MixinRoles.sol';


/**
 * @title Mixin allowing the Lock owner to grant / gift keys to users.
 * @author HardlyDifficult
 * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
 * separates logically groupings of code to ease readability.
 */
contract MixinGrantKeys is
  MixinRoles,
  MixinKeys
{
  /**
   * Allows the Lock owner to give a collection of users a key with no charge.
   * Each key may be assigned a different expiration date.
   */
  function grantKeys(
    address[] calldata _recipients,
    uint[] calldata _expirationTimestamps,
    address[] calldata _keyManagers
  ) external
    onlyKeyGranterOrManager
  {
    for(uint i = 0; i < _recipients.length; i++) {
      address recipient = _recipients[i];
      uint expirationTimestamp = _expirationTimestamps[i];
      address keyManager = _keyManagers[i];

      require(recipient != address(0), 'INVALID_ADDRESS');

      Key storage toKey = keyByOwner[recipient];
      require(expirationTimestamp > toKey.expirationTimestamp, 'ALREADY_OWNS_KEY');

      uint idTo = toKey.tokenId;

      if(idTo == 0) {
        _assignNewTokenId(toKey);
        idTo = toKey.tokenId;
        _recordOwner(recipient, idTo);
      }
      // Set the key Manager
      _setKeyManagerOf(idTo, keyManager);
      emit KeyManagerChanged(idTo, keyManager);

      toKey.expirationTimestamp = expirationTimestamp;
      // trigger event
      emit Transfer(
        address(0), // This is a creation.
        recipient,
        idTo
      );
    }
  }

  uint256[1000] private __safe_upgrade_gap;
}

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

import './MixinLockCore.sol';

/**
 * @title Mixin for managing `Key` data, as well as the * Approval related functions needed to meet the ERC721
 * standard.
 * @author HardlyDifficult
 * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
 * separates logically groupings of code to ease readability.
 */
contract MixinKeys is
  MixinLockCore
{
  // The struct for a key
  struct Key {
    uint tokenId;
    uint expirationTimestamp;
  }

  // Emitted when the Lock owner expires a user's Key
  event ExpireKey(uint indexed tokenId);

  // Emitted when the expiration of a key is modified
  event ExpirationChanged(
    uint indexed _tokenId,
    uint _amount,
    bool _timeAdded
  );

  event KeyManagerChanged(uint indexed _tokenId, address indexed _newManager);

  // Keys
  // Each owner can have at most exactly one key
  // TODO: could we use public here? (this could be confusing though because it getter will
  // return 0 values when missing a key)
  mapping (address => Key) internal keyByOwner;

  // Each tokenId can have at most exactly one owner at a time.
  // Returns 0 if the token does not exist
  // TODO: once we decouple tokenId from owner address (incl in js), then we can consider
  // merging this with totalSupply into an array instead.
  mapping (uint => address) internal _ownerOf;

  // Keep track of the total number of unique owners for this lock (both expired and valid).
  // This may be larger than totalSupply
  uint public numberOfOwners;

  // A given key has both an owner and a manager.
  // If keyManager == address(0) then the key owner is also the manager
  // Each key can have at most 1 keyManager.
  mapping (uint => address) public keyManagerOf;

    // Keeping track of approved transfers
  // This is a mapping of addresses which have approved
  // the transfer of a key to another address where their key can be transferred
  // Note: the approver may actually NOT have a key... and there can only
  // be a single approved address
  mapping (uint => address) private approved;

    // Keeping track of approved operators for a given Key manager.
  // This approves a given operator for all keys managed by the calling "keyManager"
  // The caller may not currently be the keyManager for ANY keys.
  // These approvals are never reset/revoked automatically, unlike "approved",
  // which is reset on transfer.
  mapping (address => mapping (address => bool)) private managerToOperatorApproved;

  // Ensure that the caller is the keyManager of the key
  // or that the caller has been approved
  // for ownership of that key
  modifier onlyKeyManagerOrApproved(
    uint _tokenId
  )
  {
    require(
      _isKeyManager(_tokenId, msg.sender) ||
      _isApproved(_tokenId, msg.sender) ||
      isApprovedForAll(_ownerOf[_tokenId], msg.sender),
      'ONLY_KEY_MANAGER_OR_APPROVED'
    );
    _;
  }

  // Ensures that an owner owns or has owned a key in the past
  modifier ownsOrHasOwnedKey(
    address _keyOwner
  ) {
    require(
      keyByOwner[_keyOwner].expirationTimestamp > 0, 'HAS_NEVER_OWNED_KEY'
    );
    _;
  }

  // Ensures that an owner has a valid key
  modifier hasValidKey(
    address _user
  ) {
    require(
      getHasValidKey(_user), 'KEY_NOT_VALID'
    );
    _;
  }

  // Ensures that a key has an owner
  modifier isKey(
    uint _tokenId
  ) {
    require(
      _ownerOf[_tokenId] != address(0), 'NO_SUCH_KEY'
    );
    _;
  }

  // Ensure that the caller owns the key
  modifier onlyKeyOwner(
    uint _tokenId
  ) {
    require(
      ownerOf(_tokenId) == msg.sender, 'ONLY_KEY_OWNER'
    );
    _;
  }

  /**
   * In the specific case of a Lock, each owner can own only at most 1 key.
   * @return The number of NFTs owned by `_keyOwner`, either 0 or 1.
  */
  function balanceOf(
    address _keyOwner
  )
    public
    view
    returns (uint)
  {
    require(_keyOwner != address(0), 'INVALID_ADDRESS');
    return getHasValidKey(_keyOwner) ? 1 : 0;
  }

  /**
   * Checks if the user has a non-expired key.
   */
  function getHasValidKey(
    address _keyOwner
  )
    public
    view
    returns (bool isValid)
  { 
    isValid = keyByOwner[_keyOwner].expirationTimestamp > block.timestamp;

    // use hook if it exists
    if(address(onValidKeyHook) != address(0)) {
      isValid = onValidKeyHook.hasValidKey(
        address(this),
        _keyOwner,
        keyByOwner[_keyOwner].expirationTimestamp,
        isValid
      );
    }    
  }

  /**
   * @notice Find the tokenId for a given user
   * @return The tokenId of the NFT, else returns 0
  */
  function getTokenIdFor(
    address _account
  ) public view
    returns (uint)
  {
    return keyByOwner[_account].tokenId;
  }

  /**
  * @dev Returns the key's ExpirationTimestamp field for a given owner.
  * @param _keyOwner address of the user for whom we search the key
  * @dev Returns 0 if the owner has never owned a key for this lock
  */
  function keyExpirationTimestampFor(
    address _keyOwner
  ) public view
    returns (uint)
  {
    return keyByOwner[_keyOwner].expirationTimestamp;
  }

  
  

  // Returns the owner of a given tokenId
  function ownerOf(
    uint _tokenId
  ) public view
    returns(address)
  {
    return _ownerOf[_tokenId];
  }

  /**
  * @notice Public function for updating transfer and cancel rights for a given key
  * @param _tokenId The id of the key to assign rights for
  * @param _keyManager The address with the manager's rights for the given key.
  * Setting _keyManager to address(0) means the keyOwner is also the keyManager
   */
  function setKeyManagerOf(
    uint _tokenId,
    address _keyManager
  ) public
    isKey(_tokenId)
  {
    require(
      _isKeyManager(_tokenId, msg.sender) ||
      isLockManager(msg.sender),
      'UNAUTHORIZED_KEY_MANAGER_UPDATE'
    );
    _setKeyManagerOf(_tokenId, _keyManager);
  }

  function _setKeyManagerOf(
    uint _tokenId,
    address _keyManager
  ) internal
  {
    if(keyManagerOf[_tokenId] != _keyManager) {
      keyManagerOf[_tokenId] = _keyManager;
      _clearApproval(_tokenId);
      emit KeyManagerChanged(_tokenId, _keyManager);
    }
  }

    /**
   * This approves _approved to get ownership of _tokenId.
   * Note: that since this is used for both purchase and transfer approvals
   * the approved token may not exist.
   */
  function approve(
    address _approved,
    uint _tokenId
  )
    public
    onlyIfAlive
    onlyKeyManagerOrApproved(_tokenId)
  {
    require(msg.sender != _approved, 'APPROVE_SELF');

    approved[_tokenId] = _approved;
    emit Approval(_ownerOf[_tokenId], _approved, _tokenId);
  }

    /**
   * @notice Get the approved address for a single NFT
   * @dev Throws if `_tokenId` is not a valid NFT.
   * @param _tokenId The NFT to find the approved address for
   * @return The approved address for this NFT, or the zero address if there is none
   */
  function getApproved(
    uint _tokenId
  ) public view
    isKey(_tokenId)
    returns (address)
  {
    address approvedRecipient = approved[_tokenId];
    return approvedRecipient;
  }

    /**
   * @dev Tells whether an operator is approved by a given keyManager
   * @param _owner owner address which you want to query the approval of
   * @param _operator operator address which you want to query the approval of
   * @return bool whether the given operator is approved by the given owner
   */
  function isApprovedForAll(
    address _owner,
    address _operator
  ) public view
    returns (bool)
  {
    uint tokenId = keyByOwner[_owner].tokenId;
    address keyManager = keyManagerOf[tokenId];
    if(keyManager == address(0)) {
      return managerToOperatorApproved[_owner][_operator];
    } else {
      return managerToOperatorApproved[keyManager][_operator];
    }
  }

  /**
  * Returns true if _keyManager is the manager of the key
  * identified by _tokenId
   */
  function _isKeyManager(
    uint _tokenId,
    address _keyManager
  ) internal view
    returns (bool)
  {
    if(keyManagerOf[_tokenId] == _keyManager ||
      (keyManagerOf[_tokenId] == address(0) && ownerOf(_tokenId) == _keyManager)) {
      return true;
    } else {
      return false;
    }
  }

  /**
   * Assigns the key a new tokenId (from totalSupply) if it does not already have
   * one assigned.
   */
  function _assignNewTokenId(
    Key storage _key
  ) internal
  {
    if (_key.tokenId == 0) {
      // This is a brand new owner
      // We increment the tokenId counter
      _totalSupply++;
      // we assign the incremented `_totalSupply` as the tokenId for the new key
      _key.tokenId = _totalSupply;
    }
  }

  /**
   * Records the owner of a given tokenId
   */
  function _recordOwner(
    address _keyOwner,
    uint _tokenId
  ) internal
  {

    // check expiration ts should be set to know if owner had previously registered a key 
    Key memory key = keyByOwner[_keyOwner];
    if(key.expirationTimestamp == 0 ) {
      numberOfOwners++;
    }

    // We register the owner of the tokenID
    _ownerOf[_tokenId] = _keyOwner;

  }

  /**
  * @notice Modify the expirationTimestamp of a key
  * by a given amount.
  * @param _tokenId The ID of the key to modify.
  * @param _deltaT The amount of time in seconds by which
  * to modify the keys expirationTimestamp
  * @param _addTime Choose whether to increase or decrease
  * expirationTimestamp (false == decrease, true == increase)
  * @dev Throws if owner does not have a valid key.
  */
  function _timeMachine(
    uint _tokenId,
    uint256 _deltaT,
    bool _addTime
  ) internal
  {
    address tokenOwner = ownerOf(_tokenId);
    require(tokenOwner != address(0), 'NON_EXISTENT_KEY');
    Key storage key = keyByOwner[tokenOwner];
    uint formerTimestamp = key.expirationTimestamp;
    bool validKey = getHasValidKey(tokenOwner);
    if(_addTime) {
      if(validKey) {
        key.expirationTimestamp = formerTimestamp + _deltaT;
      } else {
        key.expirationTimestamp = block.timestamp + _deltaT;
      }
    } else {
      key.expirationTimestamp = formerTimestamp - _deltaT;
    }
    emit ExpirationChanged(_tokenId, _deltaT, _addTime);
  }

    /**
   * @dev Sets or unsets the approval of a given operator
   * An operator is allowed to transfer all tokens of the sender on their behalf
   * @param _to operator address to set the approval
   * @param _approved representing the status of the approval to be set
   */
  function setApprovalForAll(
    address _to,
    bool _approved
  ) public
    onlyIfAlive
  {
    require(_to != msg.sender, 'APPROVE_SELF');
    managerToOperatorApproved[msg.sender][_to] = _approved;
    emit ApprovalForAll(msg.sender, _to, _approved);
  }

    /**
   * @dev Checks if the given user is approved to transfer the tokenId.
   */
  function _isApproved(
    uint _tokenId,
    address _user
  ) internal view
    returns (bool)
  {
    return approved[_tokenId] == _user;
  }

  /**
   * @dev Function to clear current approval of a given token ID
   * @param _tokenId uint256 ID of the token to be transferred
   */
  function _clearApproval(
    uint256 _tokenId
  ) internal
  {
    if (approved[_tokenId] != address(0)) {
      approved[_tokenId] = address(0);
    }
  }

  /**
   * @dev Change the maximum number of keys the lock can edit
   * @param _maxNumberOfKeys uint the maximum number of keys
   */
   function setMaxNumberOfKeys (uint _maxNumberOfKeys) external onlyLockManager {
     require (_maxNumberOfKeys > _totalSupply, "maxNumberOfKeys is smaller than existing supply");
     maxNumberOfKeys = _maxNumberOfKeys;
   }

   /**
   * A function to change the default duration of each key in the lock
   * @notice keys previously bought are unaffected by this change (i.e.
   * existing keys timestamps are not recalculated/updated)
   * @param _newExpirationDuration the new amount of time for each key purchased 
   * or zero (0) for a non-expiring key
   */
   function setExpirationDuration(uint _newExpirationDuration) external onlyLockManager {
     expirationDuration = _newExpirationDuration;
   }
   
   uint256[1000] private __safe_upgrade_gap;
}

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

// import '@openzeppelin/contracts-upgradeable/token/ERC721/extensions/IERC721EnumerableUpgradeable.sol';
import '@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol';
import './MixinDisable.sol';
import './MixinRoles.sol';
import '../interfaces/IUnlock.sol';
import './MixinFunds.sol';
import '../interfaces/hooks/ILockKeyCancelHook.sol';
import '../interfaces/hooks/ILockKeyPurchaseHook.sol';
import '../interfaces/hooks/ILockValidKeyHook.sol';
import '../interfaces/hooks/ILockTokenURIHook.sol';

/**
 * @title Mixin for core lock data and functions.
 * @author HardlyDifficult
 * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
 * separates logically groupings of code to ease readability.
 */
contract MixinLockCore is
  MixinRoles,
  MixinFunds,
  MixinDisable
{
  using AddressUpgradeable for address;

  event Withdrawal(
    address indexed sender,
    address indexed tokenAddress,
    address indexed beneficiary,
    uint amount
  );

  event PricingChanged(
    uint oldKeyPrice,
    uint keyPrice,
    address oldTokenAddress,
    address tokenAddress
  );

   /**
    * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
    */
  event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

  /**
    * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
    */
  event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

  /**
    * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
    */
  event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

  // Unlock Protocol address
  // TODO: should we make that private/internal?
  IUnlock public unlockProtocol;

  // Duration in seconds for which the keys are valid, after creation
  // should we take a smaller type use less gas?
  uint public expirationDuration;

  // price in wei of the next key
  // TODO: allow support for a keyPriceCalculator which could set prices dynamically
  uint public keyPrice;

  // Max number of keys sold if the keyReleaseMechanism is public
  uint public maxNumberOfKeys;

  // A count of how many new key purchases there have been
  uint internal _totalSupply;

  // The account which will receive funds on withdrawal
  address payable public beneficiary;

  // The denominator component for values specified in basis points.
  uint internal constant BASIS_POINTS_DEN = 10000;

  ILockKeyPurchaseHook public onKeyPurchaseHook;
  ILockKeyCancelHook public onKeyCancelHook;
  ILockValidKeyHook public onValidKeyHook;
  ILockTokenURIHook public onTokenURIHook;

  // Ensure that the Lock has not sold all of its keys.
  modifier notSoldOut() {
    require(maxNumberOfKeys > _totalSupply, 'LOCK_SOLD_OUT');
    _;
  }

  modifier onlyLockManagerOrBeneficiary()
  {
    require(
      isLockManager(msg.sender) || msg.sender == beneficiary,
      'ONLY_LOCK_MANAGER_OR_BENEFICIARY'
    );
    _;
  }

  function _initializeMixinLockCore(
    address payable _beneficiary,
    uint _expirationDuration,
    uint _keyPrice,
    uint _maxNumberOfKeys
  ) internal
  {
    require(_expirationDuration <= 100 * 365 * 24 * 60 * 60, 'MAX_EXPIRATION_100_YEARS');
    unlockProtocol = IUnlock(msg.sender); // Make sure we link back to Unlock's smart contract.
    beneficiary = _beneficiary;
    expirationDuration = _expirationDuration == 0 ? type(uint).max : _expirationDuration;
    keyPrice = _keyPrice;
    maxNumberOfKeys = _maxNumberOfKeys;
  }

  // The version number of the current implementation on this network
  function publicLockVersion(
  ) public pure
    returns (uint16)
  {
    return 9;
  }

  /**
   * @dev Called by owner to withdraw all funds from the lock and send them to the `beneficiary`.
   * @param _tokenAddress specifies the token address to withdraw or 0 for ETH. This is usually
   * the same as `tokenAddress` in MixinFunds.
   * @param _amount specifies the max amount to withdraw, which may be reduced when
   * considering the available balance. Set to 0 or MAX_UINT to withdraw everything.
   *
   * TODO: consider allowing anybody to trigger this as long as it goes to owner anyway?
   *  -- however be wary of draining funds as it breaks the `cancelAndRefund` and `expireAndRefundFor`
   * use cases.
   */
  function withdraw(
    address _tokenAddress,
    uint _amount
  ) external
    onlyLockManagerOrBeneficiary
  {

    // get balance
    uint balance;
    if(_tokenAddress == address(0)) {
      balance = address(this).balance;
    } else {
      balance = IERC20Upgradeable(_tokenAddress).balanceOf(address(this));
    }

    uint amount;
    if(_amount == 0 || _amount > balance)
    {
      require(balance > 0, 'NOT_ENOUGH_FUNDS');
      amount = balance;
    }
    else
    {
      amount = _amount;
    }

    emit Withdrawal(msg.sender, _tokenAddress, beneficiary, amount);
    // Security: re-entrancy not a risk as this is the last line of an external function
    _transfer(_tokenAddress, beneficiary, amount);
  }

  /**
   * A function which lets the owner of the lock change the pricing for future purchases.
   * This consists of 2 parts: The token address and the price in the given token.
   * In order to set the token to ETH, use 0 for the token Address.
   */
  function updateKeyPricing(
    uint _keyPrice,
    address _tokenAddress
  )
    external
    onlyLockManager
    onlyIfAlive
  {
    uint oldKeyPrice = keyPrice;
    address oldTokenAddress = tokenAddress;
    require(
      _tokenAddress == address(0) || IERC20Upgradeable(_tokenAddress).totalSupply() > 0,
      'INVALID_TOKEN'
    );
    keyPrice = _keyPrice;
    tokenAddress = _tokenAddress;
    emit PricingChanged(oldKeyPrice, keyPrice, oldTokenAddress, tokenAddress);
  }

  /**
   * A function which lets the owner of the lock update the beneficiary account,
   * which receives funds on withdrawal.
   */
  function updateBeneficiary(
    address payable _beneficiary
  ) external
    onlyLockManagerOrBeneficiary()
  {
    require(_beneficiary != address(0), 'INVALID_ADDRESS');
    beneficiary = _beneficiary;
  }

  /**
   * @notice Allows a lock manager to add or remove an event hook
   */
  function setEventHooks(
    address _onKeyPurchaseHook,
    address _onKeyCancelHook,
    address _onValidKeyHook,
    address _onTokenURIHook
  ) external
    onlyLockManager()
  {
    require(_onKeyPurchaseHook == address(0) || _onKeyPurchaseHook.isContract(), 'INVALID_ON_KEY_SOLD_HOOK');
    require(_onKeyCancelHook == address(0) || _onKeyCancelHook.isContract(), 'INVALID_ON_KEY_CANCEL_HOOK');
    require(_onValidKeyHook == address(0) || _onValidKeyHook.isContract(), 'INVALID_ON_VALID_KEY_HOOK');
    require(_onTokenURIHook == address(0) || _onTokenURIHook.isContract(), 'INVALID_ON_TOKEN_URI_HOOK');
    onKeyPurchaseHook = ILockKeyPurchaseHook(_onKeyPurchaseHook);
    onKeyCancelHook = ILockKeyCancelHook(_onKeyCancelHook);
    onTokenURIHook = ILockTokenURIHook(_onTokenURIHook);
    onValidKeyHook = ILockValidKeyHook(_onValidKeyHook);
  }

  function totalSupply()
    public
    view returns(uint256)
  {
    return _totalSupply;
  }

  /**
   * @notice An ERC-20 style approval, allowing the spender to transfer funds directly from this lock.
   */
  function approveBeneficiary(
    address _spender,
    uint _amount
  ) public
    onlyLockManagerOrBeneficiary
    returns (bool)
  {
    return IERC20Upgradeable(tokenAddress).approve(_spender, _amount);
  }

  uint256[1000] private __safe_upgrade_gap;
}

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

import '@openzeppelin/contracts-upgradeable/utils/introspection/ERC165StorageUpgradeable.sol';
// import '@openzeppelin/contracts-upgradeable/token/ERC721/extensions/IERC721EnumerableUpgradeable.sol';
import '../UnlockUtils.sol';
import './MixinKeys.sol';
import './MixinLockCore.sol';
import './MixinRoles.sol';

/**
 * @title Mixin for metadata about the Lock.
 * @author HardlyDifficult
 * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
 * separates logically groupings of code to ease readability.
 */
contract MixinLockMetadata is
  ERC165StorageUpgradeable,
  MixinRoles,
  MixinLockCore,
  MixinKeys
{
  using UnlockUtils for uint;
  using UnlockUtils for address;
  using UnlockUtils for string;

  /// A descriptive name for a collection of NFTs in this contract.Defaults to "Unlock-Protocol" but is settable by lock owner
  string public name;

  /// An abbreviated name for NFTs in this contract. Defaults to "KEY" but is settable by lock owner
  string private lockSymbol;

  // the base Token URI for this Lock. If not set by lock owner, the global URI stored in Unlock is used.
  string private baseTokenURI;

  event NewLockSymbol(
    string symbol
  );

  function _initializeMixinLockMetadata(
    string calldata _lockName
  ) internal
  {
    ERC165StorageUpgradeable.__ERC165Storage_init();
    name = _lockName;
    // registering the optional erc721 metadata interface with ERC165.sol using
    // the ID specified in the standard: https://eips.ethereum.org/EIPS/eip-721
    _registerInterface(0x5b5e139f);
  }

  /**
   * Allows the Lock owner to assign a descriptive name for this Lock.
   */
  function updateLockName(
    string calldata _lockName
  ) external
    onlyLockManager
  {
    name = _lockName;
  }

  /**
   * Allows the Lock owner to assign a Symbol for this Lock.
   */
  function updateLockSymbol(
    string calldata _lockSymbol
  ) external
    onlyLockManager
  {
    lockSymbol = _lockSymbol;
    emit NewLockSymbol(_lockSymbol);
  }

  /**
    * @dev Gets the token symbol
    * @return string representing the token name
    */
  function symbol()
    external view
    returns(string memory)
  {
    if(bytes(lockSymbol).length == 0) {
      return unlockProtocol.globalTokenSymbol();
    } else {
      return lockSymbol;
    }
  }

  /**
   * Allows the Lock owner to update the baseTokenURI for this Lock.
   */
  function setBaseTokenURI(
    string calldata _baseTokenURI
  ) external
    onlyLockManager
  {
    baseTokenURI = _baseTokenURI;
  }

  /**  @notice A distinct Uniform Resource Identifier (URI) for a given asset.
   * @param _tokenId The iD of the token  for which we want to retrieve the URI.
   * If 0 is passed here, we just return the appropriate baseTokenURI.
   * If a custom URI has been set we don't return the lock address.
   * It may be included in the custom baseTokenURI if needed.
   * @dev  URIs are defined in RFC 3986. The URI may point to a JSON file
   * that conforms to the "ERC721 Metadata JSON Schema".
   * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
   */
  function tokenURI(
    uint256 _tokenId
  ) external
    view
    returns(string memory)
  {
    string memory URI;
    string memory tokenId;
    string memory lockAddress = address(this).address2Str();
    string memory seperator;

    if(_tokenId != 0) {
      tokenId = _tokenId.uint2Str();
    } else {
      tokenId = '';
    }

    if(address(onTokenURIHook) != address(0))
    {
      address tokenOwner = ownerOf(_tokenId);
      uint expirationTimestamp = keyExpirationTimestampFor(tokenOwner);

      return onTokenURIHook.tokenURI(
        address(this),
        msg.sender,
        tokenOwner,
        _tokenId,
        expirationTimestamp
        );
    }

    if(bytes(baseTokenURI).length == 0) {
      URI = unlockProtocol.globalBaseTokenURI();
      seperator = '/';
    } else {
      URI = baseTokenURI;
      seperator = '';
      lockAddress = '';
    }

    return URI.strConcat(
        lockAddress,
        seperator,
        tokenId
      );
  }

  function supportsInterface(bytes4 interfaceId) 
    public 
    view 
    virtual 
    override(
      AccessControlUpgradeable,
      ERC165StorageUpgradeable
    ) 
    returns (bool) 
    {
    return super.supportsInterface(interfaceId);
  }

  uint256[1000] private __safe_upgrade_gap;
}

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

import './MixinDisable.sol';
import './MixinKeys.sol';
import './MixinLockCore.sol';
import './MixinFunds.sol';

/**
 * @title Mixin for the purchase-related functions.
 * @author HardlyDifficult
 * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
 * separates logically groupings of code to ease readability.
 */
contract MixinPurchase is
  MixinFunds,
  MixinDisable,
  MixinLockCore,
  MixinKeys
{
  event RenewKeyPurchase(address indexed owner, uint newExpiration);

  event GasRefunded(address indexed receiver, uint refundedAmount, address tokenAddress);
  
  event UnlockCallFailed(address indexed lockAddress, address unlockAddress);

  // default to 0 
  uint256 private _gasRefundValue = 0; 

  /**
  * @dev Set the value/price to be refunded to the sender on purchase
  */

  function setGasRefundValue(uint256 _refundValue) external onlyLockManager {
    _gasRefundValue = _refundValue;
  }
  
  /**
  * @dev Returns value/price to be refunded to the sender on purchase
  */
  function gasRefundValue() external view returns (uint256 _refundValue) {
    return _gasRefundValue;
  }

  /**
  * @dev Purchase function
  * @param _value the number of tokens to pay for this purchase >= the current keyPrice - any applicable discount
  * (_value is ignored when using ETH)
  * @param _recipient address of the recipient of the purchased key
  * @param _referrer address of the user making the referral
  * @param _keyManager optional address to grant managing rights to a specific address on creation
  * @param _data arbitrary data populated by the front-end which initiated the sale
  * @notice when called for an existing and non-expired key, the `_keyManager` param will be ignored 
  * @dev Setting _value to keyPrice exactly doubles as a security feature. That way if the lock owner increases the
  * price while my transaction is pending I can't be charged more than I expected (only applicable to ERC-20 when more
  * than keyPrice is approved for spending).
  */
  function purchase(
    uint256 _value,
    address _recipient,
    address _referrer,
    address _keyManager,
    bytes calldata _data
  ) external payable
    onlyIfAlive
    notSoldOut
  {
    require(_recipient != address(0), 'INVALID_ADDRESS');

    // Assign the key
    Key storage toKey = keyByOwner[_recipient];
    uint idTo = toKey.tokenId;
    uint newTimeStamp;

    if (idTo == 0) {
      // Assign a new tokenId (if a new owner or previously transferred)
      _assignNewTokenId(toKey);
      // refresh the cached value
      idTo = toKey.tokenId;
      _recordOwner(_recipient, idTo);
      // check for a non-expiring key
      if (expirationDuration == type(uint).max) {
        newTimeStamp = type(uint).max;
      } else {
        newTimeStamp = block.timestamp + expirationDuration;
      }
      toKey.expirationTimestamp = newTimeStamp;

      // set key manager
      _setKeyManagerOf(idTo, _keyManager);

      // trigger event
      emit Transfer(
        address(0), // This is a creation.
        _recipient,
        idTo
      );
    } else if (toKey.expirationTimestamp > block.timestamp) {
      // prevent re-purchase of a valid non-expiring key
      require(toKey.expirationTimestamp != type(uint).max, 'A valid non-expiring key can not be purchased twice');

      // This is an existing owner trying to extend their key
      newTimeStamp = toKey.expirationTimestamp + expirationDuration;
      toKey.expirationTimestamp = newTimeStamp;

      emit RenewKeyPurchase(_recipient, newTimeStamp);
    } else {
      // This is an existing owner trying to renew their expired or cancelled key
      if(expirationDuration == type(uint).max) {
        newTimeStamp = type(uint).max;
      } else {
        newTimeStamp = block.timestamp + expirationDuration;
      }
      toKey.expirationTimestamp = newTimeStamp;

      _setKeyManagerOf(idTo, _keyManager);

      emit RenewKeyPurchase(_recipient, newTimeStamp);
    }

    
    uint inMemoryKeyPrice = _purchasePriceFor(_recipient, _referrer, _data);

    try unlockProtocol.recordKeyPurchase(inMemoryKeyPrice, _referrer) 
    {} 
    catch {
      // emit missing unlock
      emit UnlockCallFailed(address(this), address(unlockProtocol));
    }

    // We explicitly allow for greater amounts of ETH or tokens to allow 'donations'
    uint pricePaid;
    if(tokenAddress != address(0))
    {
      pricePaid = _value;
      IERC20Upgradeable token = IERC20Upgradeable(tokenAddress);
      token.transferFrom(msg.sender, address(this), pricePaid);
    }
    else
    {
      pricePaid = msg.value;
    }
    require(pricePaid >= inMemoryKeyPrice, 'INSUFFICIENT_VALUE');

    if(address(onKeyPurchaseHook) != address(0))
    {
      onKeyPurchaseHook.onKeyPurchase(msg.sender, _recipient, _referrer, _data, inMemoryKeyPrice, pricePaid);
    }

    // refund gas
    if (_gasRefundValue != 0) {
      if(tokenAddress != address(0)) {
        IERC20Upgradeable token = IERC20Upgradeable(tokenAddress);
        token.transferFrom(address(this), msg.sender, _gasRefundValue);
      } else {
        (bool success, ) = msg.sender.call{value: _gasRefundValue}("");
        require(success, "Refund failed.");
      }
      emit GasRefunded(msg.sender, _gasRefundValue, tokenAddress);
    }
  }

  /**
   * @notice returns the minimum price paid for a purchase with these params.
   * @dev minKeyPrice considers any discount from Unlock or the OnKeyPurchase hook
   */
  function purchasePriceFor(
    address _recipient,
    address _referrer,
    bytes calldata _data
  ) external view
    returns (uint minKeyPrice)
  {
    minKeyPrice = _purchasePriceFor(_recipient, _referrer, _data);
  }

  /**
   * @notice returns the minimum price paid for a purchase with these params.
   * @dev minKeyPrice considers any discount from Unlock or the OnKeyPurchase hook
   */
  function _purchasePriceFor(
    address _recipient,
    address _referrer,
    bytes memory _data
  ) internal view
    returns (uint minKeyPrice)
  {
    if(address(onKeyPurchaseHook) != address(0))
    {
      minKeyPrice = onKeyPurchaseHook.keyPurchasePrice(msg.sender, _recipient, _referrer, _data);
    }
    else
    {
      minKeyPrice = keyPrice;
    }
    return minKeyPrice;
  }

  uint256[1000] private __safe_upgrade_gap;
}

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

import './MixinKeys.sol';
import './MixinLockCore.sol';
import './MixinRoles.sol';
import './MixinFunds.sol';


contract MixinRefunds is
  MixinRoles,
  MixinFunds,
  MixinLockCore,
  MixinKeys
{
  // CancelAndRefund will return funds based on time remaining minus this penalty.
  // This is calculated as `proRatedRefund * refundPenaltyBasisPoints / BASIS_POINTS_DEN`.
  uint public refundPenaltyBasisPoints;

  uint public freeTrialLength;

  event CancelKey(
    uint indexed tokenId,
    address indexed owner,
    address indexed sendTo,
    uint refund
  );

  event RefundPenaltyChanged(
    uint freeTrialLength,
    uint refundPenaltyBasisPoints
  );

  function _initializeMixinRefunds() internal
  {
    // default to 10%
    refundPenaltyBasisPoints = 1000;
  }

  /**
   * @dev Invoked by the lock owner to destroy the user's ket and perform a refund and cancellation
   * of the key
   */
  function expireAndRefundFor(
    address payable _keyOwner,
    uint amount
  ) external
    onlyLockManager
    hasValidKey(_keyOwner)
  {
    _cancelAndRefund(_keyOwner, amount);
  }

  /**
   * @dev Destroys the key and sends a refund based on the amount of time remaining.
   * @param _tokenId The id of the key to cancel.
   */
  function cancelAndRefund(uint _tokenId)
    external
    onlyKeyManagerOrApproved(_tokenId)
  {
    address payable keyOwner = payable(ownerOf(_tokenId));
    uint refund = _getCancelAndRefundValue(keyOwner);

    _cancelAndRefund(keyOwner, refund);
  }

  /**
   * Allow the owner to change the refund penalty.
   */
  function updateRefundPenalty(
    uint _freeTrialLength,
    uint _refundPenaltyBasisPoints
  ) external
    onlyLockManager
  {
    emit RefundPenaltyChanged(
      _freeTrialLength,
      _refundPenaltyBasisPoints
    );

    freeTrialLength = _freeTrialLength;
    refundPenaltyBasisPoints = _refundPenaltyBasisPoints;
  }

  /**
   * @dev Determines how much of a refund a key owner would receive if they issued
   * a cancelAndRefund block.timestamp.
   * Note that due to the time required to mine a tx, the actual refund amount will be lower
   * than what the user reads from this call.
   */
  function getCancelAndRefundValueFor(
    address _keyOwner
  )
    external view
    returns (uint refund)
  {
    return _getCancelAndRefundValue(_keyOwner);
  }

  /**
   * @dev cancels the key for the given keyOwner and sends the refund to the msg.sender.
   */
  function _cancelAndRefund(
    address payable _keyOwner,
    uint refund
  ) internal
  {
    Key storage key = keyByOwner[_keyOwner];

    emit CancelKey(key.tokenId, _keyOwner, msg.sender, refund);
    // expirationTimestamp is a proxy for hasKey, setting this to `block.timestamp` instead
    // of 0 so that we can still differentiate hasKey from hasValidKey.
    key.expirationTimestamp = block.timestamp;

    if (refund > 0) {
      // Security: doing this last to avoid re-entrancy concerns
      _transfer(tokenAddress, _keyOwner, refund);
    }

    // inform the hook if there is one registered
    if(address(onKeyCancelHook) != address(0))
    {
      onKeyCancelHook.onKeyCancel(msg.sender, _keyOwner, refund);
    }
  }

  /**
   * @dev Determines how much of a refund a key owner would receive if they issued
   * a cancelAndRefund now.
   * @param _keyOwner The owner of the key check the refund value for.
   */
  function _getCancelAndRefundValue(
    address _keyOwner
  )
    private view
    hasValidKey(_keyOwner)
    returns (uint refund)
  {
    Key storage key = keyByOwner[_keyOwner];

    // return entire purchased price if key is non-expiring
    if(expirationDuration == type(uint).max) {
      return keyPrice;
    }

    // Math: safeSub is not required since `hasValidKey` confirms timeRemaining is positive
    uint timeRemaining = key.expirationTimestamp - block.timestamp;
    if(timeRemaining + freeTrialLength >= expirationDuration) {
      refund = keyPrice;
    } else {
      refund = keyPrice * timeRemaining / expirationDuration;
    }

    // Apply the penalty if this is not a free trial
    if(freeTrialLength == 0 || timeRemaining + freeTrialLength < expirationDuration)
    {
      uint penalty = keyPrice * refundPenaltyBasisPoints / BASIS_POINTS_DEN;
      if (refund > penalty) {
        refund -= penalty;
      } else {
        refund = 0;
      }
    }
  }

  uint256[1000] private __safe_upgrade_gap;
}

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

import './MixinRoles.sol';
import './MixinDisable.sol';
import './MixinKeys.sol';
import './MixinFunds.sol';
import './MixinLockCore.sol';
import '@openzeppelin/contracts-upgradeable/token/ERC721/IERC721ReceiverUpgradeable.sol';
import '@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol';

/**
 * @title Mixin for the transfer-related functions needed to meet the ERC721
 * standard.
 * @author Nick Furfaro
 * @dev `Mixins` are a design pattern seen in the 0x contracts.  It simply
 * separates logically groupings of code to ease readability.
 */

contract MixinTransfer is
  MixinRoles,
  MixinFunds,
  MixinLockCore,
  MixinKeys
{
  using AddressUpgradeable for address;

  event TransferFeeChanged(
    uint transferFeeBasisPoints
  );

  // 0x150b7a02 == bytes4(keccak256('onERC721Received(address,address,uint256,bytes)'))
  bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;

  // The fee relative to keyPrice to charge when transfering a Key to another account
  // (potentially on a 0x marketplace).
  // This is calculated as `keyPrice * transferFeeBasisPoints / BASIS_POINTS_DEN`.
  uint public transferFeeBasisPoints;

  /**
  * @notice Allows the key owner to safely share their key (parent key) by
  * transferring a portion of the remaining time to a new key (child key).
  * @param _to The recipient of the shared key
  * @param _tokenId the key to share
  * @param _timeShared The amount of time shared
  */
  function shareKey(
    address _to,
    uint _tokenId,
    uint _timeShared
  ) public
    onlyIfAlive
    onlyKeyManagerOrApproved(_tokenId)
  {
    require(transferFeeBasisPoints < BASIS_POINTS_DEN, 'KEY_TRANSFERS_DISABLED');
    require(_to != address(0), 'INVALID_ADDRESS');
    address keyOwner = _ownerOf[_tokenId];
    require(getHasValidKey(keyOwner), 'KEY_NOT_VALID');
    require(keyOwner != _to, 'TRANSFER_TO_SELF');

    Key storage fromKey = keyByOwner[keyOwner];
    Key storage toKey = keyByOwner[_to];
    uint idTo = toKey.tokenId;
    uint time;
    // get the remaining time for the origin key
    uint timeRemaining = fromKey.expirationTimestamp - block.timestamp;
    // get the transfer fee based on amount of time wanted share
    uint fee = getTransferFee(keyOwner, _timeShared);
    uint timePlusFee = _timeShared + fee;

    // ensure that we don't try to share too much
    if(timePlusFee < timeRemaining) {
      // now we can safely set the time
      time = _timeShared;
      // deduct time from parent key, including transfer fee
      _timeMachine(_tokenId, timePlusFee, false);
    } else {
      // we have to recalculate the fee here
      fee = getTransferFee(keyOwner, timeRemaining);
      time = timeRemaining - fee;
      fromKey.expirationTimestamp = block.timestamp; // Effectively expiring the key
      emit ExpireKey(_tokenId);
    }

    if (idTo == 0) {
      _assignNewTokenId(toKey);
      idTo = toKey.tokenId;
      _recordOwner(_to, idTo);
      emit Transfer(
        address(0), // This is a creation or time-sharing
        _to,
        idTo
      );
    } else if (toKey.expirationTimestamp <= block.timestamp) {
      // reset the key Manager for expired keys
      _setKeyManagerOf(idTo, address(0));
    }

    // add time to new key
    _timeMachine(idTo, time, true);
    // trigger event
    emit Transfer(
      keyOwner,
      _to,
      idTo
    );

    require(_checkOnERC721Received(keyOwner, _to, idTo, ''), 'NON_COMPLIANT_ERC721_RECEIVER');
  }

  function transferFrom(
    address _from,
    address _recipient,
    uint _tokenId
  )
    public
    onlyIfAlive
    hasValidKey(_from)
    onlyKeyManagerOrApproved(_tokenId)
  {
    require(ownerOf(_tokenId) == _from, 'TRANSFER_FROM: NOT_KEY_OWNER');
    require(transferFeeBasisPoints < BASIS_POINTS_DEN, 'KEY_TRANSFERS_DISABLED');
    require(_recipient != address(0), 'INVALID_ADDRESS');
    require(_from != _recipient, 'TRANSFER_TO_SELF');
    uint fee = getTransferFee(_from, 0);

    Key storage fromKey = keyByOwner[_from];
    Key storage toKey = keyByOwner[_recipient];

    uint previousExpiration = toKey.expirationTimestamp;
    // subtract the fee from the senders key before the transfer
    _timeMachine(_tokenId, fee, false);

    if (toKey.tokenId == 0) {
      toKey.tokenId = _tokenId;
      _recordOwner(_recipient, _tokenId);
      // Clear any previous approvals
      _clearApproval(_tokenId);
    }

    if (previousExpiration <= block.timestamp) {
      // The recipient did not have a key, or had a key but it expired. The new expiration is the sender's key expiration
      // An expired key is no longer a valid key, so the new tokenID is the sender's tokenID
      toKey.expirationTimestamp = fromKey.expirationTimestamp;
      toKey.tokenId = _tokenId;

      // Reset the key Manager to the key owner
      _setKeyManagerOf(_tokenId, address(0));

      _recordOwner(_recipient, _tokenId);
    } else {
      require(expirationDuration != type(uint).max, 'Recipient already owns a non-expiring key');
      // The recipient has a non expired key. We just add them the corresponding remaining time
      // SafeSub is not required since the if confirms `previousExpiration - block.timestamp` cannot underflow
      toKey.expirationTimestamp = fromKey.expirationTimestamp + previousExpiration - block.timestamp;
    }

    // Effectively expiring the key for the previous owner
    fromKey.expirationTimestamp = block.timestamp;

    // Set the tokenID to 0 for the previous owner to avoid duplicates
    fromKey.tokenId = 0;

    // trigger event
    emit Transfer(
      _from,
      _recipient,
      _tokenId
    );
  }

  /**
   * @notice An ERC-20 style transfer.
   * @param _value sends a token with _value * expirationDuration (the amount of time remaining on a standard purchase).
   * @dev The typical use case would be to call this with _value 1, which is on par with calling `transferFrom`. If the user
   * has more than `expirationDuration` time remaining this may use the `shareKey` function to send some but not all of the token.
   */
  function transfer(
    address _to,
    uint _value
  ) public
    returns (bool success)
  {
    uint maxTimeToSend = _value * expirationDuration;
    Key storage fromKey = keyByOwner[msg.sender];
    uint timeRemaining = fromKey.expirationTimestamp - block.timestamp;
    if(maxTimeToSend < timeRemaining)
    {
      shareKey(_to, fromKey.tokenId, maxTimeToSend);
    }
    else
    {
      transferFrom(msg.sender, _to, fromKey.tokenId);
    }

    // Errors will cause a revert
    return true;
  }

  /**
  * @notice Transfers the ownership of an NFT from one address to another address
  * @dev This works identically to the other function with an extra data parameter,
  *  except this function just sets data to ''
  * @param _from The current owner of the NFT
  * @param _to The new owner
  * @param _tokenId The NFT to transfer
  */
  function safeTransferFrom(
    address _from,
    address _to,
    uint _tokenId
  )
    public
  {
    safeTransferFrom(_from, _to, _tokenId, '');
  }

  /**
  * @notice Transfers the ownership of an NFT from one address to another address.
  * When transfer is complete, this functions
  *  checks if `_to` is a smart contract (code size > 0). If so, it calls
  *  `onERC721Received` on `_to` and throws if the return value is not
  *  `bytes4(keccak256('onERC721Received(address,address,uint,bytes)'))`.
  * @param _from The current owner of the NFT
  * @param _to The new owner
  * @param _tokenId The NFT to transfer
  * @param _data Additional data with no specified format, sent in call to `_to`
  */
  function safeTransferFrom(
    address _from,
    address _to,
    uint _tokenId,
    bytes memory _data
  )
    public
  {
    transferFrom(_from, _to, _tokenId);
    require(_checkOnERC721Received(_from, _to, _tokenId, _data), 'NON_COMPLIANT_ERC721_RECEIVER');

  }

  /**
   * Allow the Lock owner to change the transfer fee.
   */
  function updateTransferFee(
    uint _transferFeeBasisPoints
  )
    external
    onlyLockManager
  {
    emit TransferFeeChanged(
      _transferFeeBasisPoints
    );
    transferFeeBasisPoints = _transferFeeBasisPoints;
  }

  /**
   * Determines how much of a fee a key owner would need to pay in order to
   * transfer the key to another account.  This is pro-rated so the fee goes down
   * overtime.
   * @param _keyOwner The owner of the key check the transfer fee for.
   */
  function getTransferFee(
    address _keyOwner,
    uint _time
  )
    public view
    returns (uint)
  {
    if(! getHasValidKey(_keyOwner)) {
      return 0;
    } else {
      Key storage key = keyByOwner[_keyOwner];
      uint timeToTransfer;
      uint fee;
      // Math: safeSub is not required since `hasValidKey` confirms timeToTransfer is positive
      // this is for standard key transfers
      if(_time == 0) {
        timeToTransfer = key.expirationTimestamp - block.timestamp;
      } else {
        timeToTransfer = _time;
      }
      fee = timeToTransfer * transferFeeBasisPoints / BASIS_POINTS_DEN;
      return fee;
    }
  }

  /**
   * @dev Internal function to invoke `onERC721Received` on a target address
   * The call is not executed if the target address is not a contract
   * @param from address representing the previous owner of the given token ID
   * @param to target address that will receive the tokens
   * @param tokenId uint256 ID of the token to be transferred
   * @param _data bytes optional data to send along with the call
   * @return whether the call correctly returned the expected magic value
   */
  function _checkOnERC721Received(
    address from,
    address to,
    uint256 tokenId,
    bytes memory _data
  )
    internal
    returns (bool)
  {
    if (!to.isContract()) {
      return true;
    }
    bytes4 retval = IERC721ReceiverUpgradeable(to).onERC721Received(
      msg.sender, from, tokenId, _data);
    return (retval == _ERC721_RECEIVED);
  }

  uint256[1000] private __safe_upgrade_gap;
}

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

// This contract mostly follows the pattern established by openzeppelin in
// openzeppelin/contracts-ethereum-package/contracts/access/roles

import '@openzeppelin/contracts-upgradeable/access/AccessControlUpgradeable.sol';

contract MixinRoles is AccessControlUpgradeable {

  // roles
  bytes32 public constant LOCK_MANAGER_ROLE = keccak256("LOCK_MANAGER");
  bytes32 public constant KEY_GRANTER_ROLE = keccak256("KEY_GRANTER");

  // events
  event LockManagerAdded(address indexed account);
  event LockManagerRemoved(address indexed account);
  event KeyGranterAdded(address indexed account);
  event KeyGranterRemoved(address indexed account);

  // initializer
  function _initializeMixinRoles(address sender) internal {

    // for admin mamangers to add other lock admins
    _setRoleAdmin(LOCK_MANAGER_ROLE, LOCK_MANAGER_ROLE);

    // for lock managers to add/remove key granters
    _setRoleAdmin(KEY_GRANTER_ROLE, LOCK_MANAGER_ROLE);

    if (!isLockManager(sender)) {
      _setupRole(LOCK_MANAGER_ROLE, sender);  
    }
    if (!isKeyGranter(sender)) {
      _setupRole(KEY_GRANTER_ROLE, sender);
    }
  }

  // modifiers
  modifier onlyLockManager() {
    require( hasRole(LOCK_MANAGER_ROLE, msg.sender), 'MixinRoles: caller does not have the LockManager role');
    _;
  }

  modifier onlyKeyGranterOrManager() {
    require(isKeyGranter(msg.sender) || isLockManager(msg.sender), 'MixinRoles: caller does not have the KeyGranter or LockManager role');
    _;
  }


  // lock manager functions
  function isLockManager(address account) public view returns (bool) {
    return hasRole(LOCK_MANAGER_ROLE, account);
  }

  function addLockManager(address account) public onlyLockManager {
    grantRole(LOCK_MANAGER_ROLE, account);
    emit LockManagerAdded(account);
  }

  function renounceLockManager() public {
    renounceRole(LOCK_MANAGER_ROLE, msg.sender);
    emit LockManagerRemoved(msg.sender);
  }


  // key granter functions
  function isKeyGranter(address account) public view returns (bool) {
    return hasRole(KEY_GRANTER_ROLE, account);
  }

  function addKeyGranter(address account) public onlyLockManager {
    grantRole(KEY_GRANTER_ROLE, account);
    emit KeyGranterAdded(account);
  }

  function revokeKeyGranter(address _granter) public onlyLockManager {
    revokeRole(KEY_GRANTER_ROLE, _granter);
    emit KeyGranterRemoved(_granter);
  }

  uint256[1000] private __safe_upgrade_gap;
}

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

pragma solidity ^0.8.0;

/**
 * @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
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

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

        (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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

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

pragma solidity ^0.8.0;

import "./IERC165Upgradeable.sol";
import "../../proxy/utils/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 {
        __ERC165_init_unchained();
    }

    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;
    }
    uint256[50] private __gap;
}

// 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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

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

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

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20Upgradeable.sol";
import "../../../utils/AddressUpgradeable.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20Upgradeable {
    using AddressUpgradeable for address;

    function safeTransfer(
        IERC20Upgradeable token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20Upgradeable token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20Upgradeable token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

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

pragma solidity ^0.8.0;

import "./IAccessControlUpgradeable.sol";
import "../utils/ContextUpgradeable.sol";
import "../utils/StringsUpgradeable.sol";
import "../utils/introspection/ERC165Upgradeable.sol";
import "../proxy/utils/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 {
        __Context_init_unchained();
        __ERC165_init_unchained();
        __AccessControl_init_unchained();
    }

    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, _msgSender());
        _;
    }

    /**
     * @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 override returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @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 {
        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 override returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) public virtual override 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.
     */
    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`.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     *
     * 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.
     */
    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.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
    uint256[49] private __gap;
}

// 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/Context.sol)

pragma solidity ^0.8.0;
import "../proxy/utils/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 {
        __Context_init_unchained();
    }

    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;
    }
    uint256[50] private __gap;
}

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

pragma solidity ^0.8.0;

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

    /**
     * @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);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.5.17 <0.9.0;


/**
 * @title The Unlock Interface
 * @author Nick Furfaro (unlock-protocol.com)
**/

interface IUnlock
{
  // Use initialize instead of a constructor to support proxies(for upgradeability via zos).
  function initialize(address _unlockOwner) external;

  /**
  * @dev deploy a ProxyAdmin contract used to upgrade locks
  */
  function initializeProxyAdmin() external;

  // store contract proxy admin address
  function proxyAdminAddress() external view;

  /**
  * @notice Create lock (legacy)
  * This deploys a lock for a creator. It also keeps track of the deployed lock.
  * @param _expirationDuration the duration of the lock (pass 0 for unlimited duration)
  * @param _tokenAddress set to the ERC20 token address, or 0 for ETH.
  * @param _keyPrice the price of each key
  * @param _maxNumberOfKeys the maximum nimbers of keys to be edited
  * @param _lockName the name of the lock
  * param _salt [deprec] -- kept only for backwards copatibility
  * This may be implemented as a sequence ID or with RNG. It's used with `create2`
  * to know the lock's address before the transaction is mined.
  * @dev internally call `createUpgradeableLock`
  */
  function createLock(
    uint _expirationDuration,
    address _tokenAddress,
    uint _keyPrice,
    uint _maxNumberOfKeys,
    string calldata _lockName,
    bytes12 // _salt
  ) external returns(address);

  /**
  * @notice Create lock (default)
  * This deploys a lock for a creator. It also keeps track of the deployed lock.
  * @param data bytes containing the call to initialize the lock template
  * @dev this call is passed as encoded function - for instance:
  *  bytes memory data = abi.encodeWithSignature(
  *    'initialize(address,uint256,address,uint256,uint256,string)',
  *    msg.sender,
  *    _expirationDuration,
  *    _tokenAddress,
  *    _keyPrice,
  *    _maxNumberOfKeys,
  *    _lockName
  *  );
  * @return address of the create lock
  */
  function createUpgradeableLock(
    bytes memory data
  ) external returns(address);

  /**
  * @notice Upgrade a lock to a specific version
  * @dev only available for publicLockVersion > 10 (proxyAdmin /required)
  * @param lockAddress the existing lock address
  * @param version the version number you are targeting
  * Likely implemented with OpenZeppelin TransparentProxy contract
  */
  function upgradeLock(
    address payable lockAddress, 
    uint16 version
  ) external returns(address);

    /**
   * This function keeps track of the added GDP, as well as grants of discount tokens
   * to the referrer, if applicable.
   * The number of discount tokens granted is based on the value of the referal,
   * the current growth rate and the lock's discount token distribution rate
   * This function is invoked by a previously deployed lock only.
   */
  function recordKeyPurchase(
    uint _value,
    address _referrer // solhint-disable-line no-unused-vars
  )
    external;

    /**
   * @notice [DEPRECATED] Call to this function has been removed from PublicLock > v9.
   * @dev [DEPRECATED] Kept for backwards compatibility
   * This function will keep track of consumed discounts by a given user.
   * It will also grant discount tokens to the creator who is granting the discount based on the
   * amount of discount and compensation rate.
   * This function is invoked by a previously deployed lock only.
   */
  function recordConsumedDiscount(
    uint _discount,
    uint _tokens // solhint-disable-line no-unused-vars
  )
    external;

    /**
   * @notice [DEPRECATED] Call to this function has been removed from PublicLock > v9.
   * @dev [DEPRECATED] Kept for backwards compatibility
   * This function returns the discount available for a user, when purchasing a
   * a key from a lock.
   * This does not modify the state. It returns both the discount and the number of tokens
   * consumed to grant that discount.
   */
  function computeAvailableDiscountFor(
    address _purchaser, // solhint-disable-line no-unused-vars
    uint _keyPrice // solhint-disable-line no-unused-vars
  )
    external
    view
    returns(uint discount, uint tokens);

  // Function to read the globalTokenURI field.
  function globalBaseTokenURI()
    external
    view
    returns(string memory);

  /**
   * @dev Redundant with globalBaseTokenURI() for backwards compatibility with v3 & v4 locks.
   */
  function getGlobalBaseTokenURI()
    external
    view
    returns (string memory);

  // Function to read the globalTokenSymbol field.
  function globalTokenSymbol()
    external
    view
    returns(string memory);

  // Function to read the chainId field.
  function chainId()
    external
    view
    returns(uint);

  /**
   * @dev Redundant with globalTokenSymbol() for backwards compatibility with v3 & v4 locks.
   */
  function getGlobalTokenSymbol()
    external
    view
    returns (string memory);

  /**
   * @notice Allows the owner to update configuration variables
   */
  function configUnlock(
    address _udt,
    address _weth,
    uint _estimatedGasForPurchase,
    string calldata _symbol,
    string calldata _URI,
    uint _chainId
  )
    external;

  /**
   * @notice Add a PublicLock template to be used for future calls to `createLock`.
   * @dev This is used to upgrade conytract per version number
   */
  function addLockTemplate(address impl, uint16 version) external;

  // match lock templates addresses with version numbers
  function publicLockImpls(uint16 _version) external view;
  
  // match version numbers with lock templates addresses 
  function publicLockVersions(address _impl) external view;

  // the latest existing lock template version
  function publicLockLatestVersion() external view;

  /**
   * @notice Upgrade the PublicLock template used for future calls to `createLock`.
   * @dev This will initialize the template and revokeOwnership.
   */
  function setLockTemplate(
    address payable _publicLockAddress
  ) external;

  // Allows the owner to change the value tracking variables as needed.
  function resetTrackedValue(
    uint _grossNetworkProduct,
    uint _totalDiscountGranted
  ) external;

  function grossNetworkProduct() external view returns(uint);

  function totalDiscountGranted() external view returns(uint);

  function locks(address) external view returns(bool deployed, uint totalSales, uint yieldedDiscountTokens);

  // The address of the public lock template, used when `createLock` is called
  function publicLockAddress() external view returns(address);

  // Map token address to exchange contract address if the token is supported
  // Used for GDP calculations
  function uniswapOracles(address) external view returns(address);

  // The WETH token address, used for value calculations
  function weth() external view returns(address);

  // The UDT token address, used to mint tokens on referral
  function udt() external view returns(address);

  // The approx amount of gas required to purchase a key
  function estimatedGasForPurchase() external view returns(uint);

  /**
   * Helper to get the network mining basefee as introduced in EIP-1559
   * @dev this helper can be wrapped in try/catch statement to avoid 
   * revert in networks where EIP-1559 is not implemented
   */
  function networkBaseFee() external view returns (uint);

  // The version number of the current Unlock implementation on this network
  function unlockVersion() external pure returns(uint16);

  /**
   * @notice allows the owner to set the oracle address to use for value conversions
   * setting the _oracleAddress to address(0) removes support for the token
   * @dev This will also call update to ensure at least one datapoint has been recorded.
   */
  function setOracle(
    address _tokenAddress,
    address _oracleAddress
  ) external;

  // Initialize the Ownable contract, granting contract ownership to the specified sender
  function __initializeOwnable(address sender) external;

  /**
   * @dev Returns true if the caller is the current owner.
   */
  function isOwner() external view returns(bool);

  /**
   * @dev Returns the address of the current owner.
   */
  function owner() external view returns(address);

  /**
   * @dev Leaves the contract without owner. It will not be possible to call
   * `onlyOwner` functions anymore. Can only be called by the current owner.
   *
   * NOTE: Renouncing ownership will leave the contract without an owner,
   * thereby removing any functionality that is only available to the owner.
   */
  function renounceOwnership() external;

  /**
   * @dev Transfers ownership of the contract to a new account (`newOwner`).
   * Can only be called by the current owner.
   */
  function transferOwnership(address newOwner) external;
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.5.17 <0.9.0;


/**
 * @notice Functions to be implemented by a keyCancelHook.
 * @dev Lock hooks are configured by calling `setEventHooks` on the lock.
 */
interface ILockKeyCancelHook
{
  /**
   * @notice If the lock owner has registered an implementer
   * then this hook is called with every key cancel.
   * @param operator the msg.sender issuing the cancel
   * @param to the account which had the key canceled
   * @param refund the amount sent to the `to` account (ETH or a ERC-20 token)
   */
  function onKeyCancel(
    address operator,
    address to,
    uint256 refund
  ) external;
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.5.17 <0.9.0;


/**
 * @notice Functions to be implemented by a keyPurchaseHook.
 * @dev Lock hooks are configured by calling `setEventHooks` on the lock.
 */
interface ILockKeyPurchaseHook
{
  /**
   * @notice Used to determine the purchase price before issueing a transaction.
   * This allows the hook to offer a discount on purchases.
   * This may revert to prevent a purchase.
   * @param from the msg.sender making the purchase
   * @param recipient the account which will be granted a key
   * @param referrer the account which referred this key sale
   * @param data arbitrary data populated by the front-end which initiated the sale
   * @return minKeyPrice the minimum value/price required to purchase a key with these settings
   * @dev the lock's address is the `msg.sender` when this function is called via
   * the lock's `purchasePriceFor` function
   */
  function keyPurchasePrice(
    address from,
    address recipient,
    address referrer,
    bytes calldata data
  ) external view
    returns (uint minKeyPrice);

  /**
   * @notice If the lock owner has registered an implementer then this hook
   * is called with every key sold.
   * @param from the msg.sender making the purchase
   * @param recipient the account which will be granted a key
   * @param referrer the account which referred this key sale
   * @param data arbitrary data populated by the front-end which initiated the sale
   * @param minKeyPrice the price including any discount granted from calling this
   * hook's `keyPurchasePrice` function
   * @param pricePaid the value/pricePaid included with the purchase transaction
   * @dev the lock's address is the `msg.sender` when this function is called
   */
  function onKeyPurchase(
    address from,
    address recipient,
    address referrer,
    bytes calldata data,
    uint minKeyPrice,
    uint pricePaid
  ) external;
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.5.17 <0.9.0;


/**
 * @notice Functions to be implemented by a hasValidKey Hook.
 * @dev Lock hooks are configured by calling `setEventHooks` on the lock.
 */
interface ILockValidKeyHook
{

  /**
   * @notice If the lock owner has registered an implementer then this hook
   * is called every time balanceOf is called
   * @param lockAddress the address of the current lock
   * @param keyOwner the potential owner of the key for which we are retrieving the `balanceof`
   * @param expirationTimestamp the key expiration timestamp
   */
  function hasValidKey(
    address lockAddress,
    address keyOwner,
    uint256 expirationTimestamp,
    bool isValidKey
  ) 
  external view
  returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.5.17 <0.9.0;

/**
 * @notice Functions to be implemented by a tokenURIHook.
 * @dev Lock hooks are configured by calling `setEventHooks` on the lock.
 */
interface ILockTokenURIHook
{
  /**
   * @notice If the lock owner has registered an implementer
   * then this hook is called every time `tokenURI()` is called
   * @param lockAddress the address of the lock
   * @param operator the msg.sender issuing the call
   * @param owner the owner of the key for which we are retrieving the `tokenUri`
   * @param keyId the id (tokenId) of the key (if applicable)
   * @param expirationTimestamp the key expiration timestamp
   * @return the tokenURI
   */
  function tokenURI(
    address lockAddress,
    address operator,
    address owner,
    uint256 keyId,
    uint expirationTimestamp
  ) external view returns(string memory);
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.5.17 <0.8.5;

// This contract provides some utility methods for use with the unlock protocol smart contracts.
// Borrowed from:
// https://github.com/oraclize/ethereum-api/blob/master/oraclizeAPI_0.5.sol#L943

library UnlockUtils {

  function strConcat(
    string memory _a,
    string memory _b,
    string memory _c,
    string memory _d
  ) internal pure
    returns (string memory _concatenatedString)
  {
    return string(abi.encodePacked(_a, _b, _c, _d));
  }

  function uint2Str(
    uint _i
  ) internal pure
    returns (string memory _uintAsString)
  {
    // make a copy of the param to avoid security/no-assign-params error
    uint c = _i;
    if (_i == 0) {
      return '0';
    }
    uint j = _i;
    uint len;
    while (j != 0) {
      len++;
      j /= 10;
    }
    bytes memory bstr = new bytes(len);
    uint k = len;
    while (c != 0) {
        k = k-1;
        uint8 temp = (48 + uint8(c - c / 10 * 10));
        bytes1 b1 = bytes1(temp);
        bstr[k] = b1;
        c /= 10;
    }
    return string(bstr);
  }

  function address2Str(
    address _addr
  ) internal pure
    returns(string memory)
  {
    bytes32 value = bytes32(uint256(uint160(_addr)));
    bytes memory alphabet = '0123456789abcdef';
    bytes memory str = new bytes(42);
    str[0] = '0';
    str[1] = 'x';
    for (uint i = 0; i < 20; i++) {
      str[2+i*2] = alphabet[uint8(value[i + 12] >> 4)];
      str[3+i*2] = alphabet[uint8(value[i + 12] & 0x0f)];
    }
    return string(str);
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721ReceiverUpgradeable {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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