Contract 0xfe5e8baaa93bb559142593b6402595f493a79a68

/**
 *Submitted for verification at polygonscan.com on 2021-06-30
*/

// Sources flattened with hardhat v2.0.10 https://hardhat.org

// File @openzeppelin/contracts/utils/[email protected]

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

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

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

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}


// File contracts3/roles/Roles.sol


pragma solidity ^0.8.0;

library Roles {
    struct Role {
        mapping(address => bool) bearer;
    }

    function add(Role storage role, address account) internal {
        require(!has(role, account), "role already has the account");
        role.bearer[account] = true;
    }

    function remove(Role storage role, address account) internal {
        require(has(role, account), "role dosen't have the account");
        role.bearer[account] = false;
    }

    function has(Role storage role, address account)
        internal
        view
        returns (bool)
    {
        return role.bearer[account];
    }
}


// File contracts3/roles/ERC173.sol


pragma solidity ^0.8.0;

//import "@openzeppelin/contracts/utils/introspection/ERC165.sol";

/// @title ERC-173 Contract Ownership Standard
/// @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-173.md
///  Note: the ERC-165 identifier for this interface is 0x7f5828d0
/* is ERC165 */
interface IERC173 {
    /// @dev This emits when ownership of a contract changes.
    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    /// @notice Get the address of the owner
    /// @return The address of the owner.
    function owner() external view returns (address);

    /// @notice Set the address of the new owner of the contract
    /// @param _newOwner The address of the new owner of the contract
    function transferOwnership(address _newOwner) external;
}

abstract contract ERC173 is IERC173 {
    address private _owner;

    constructor() {
        //_registerInterface(0x7f5828d0);
        _transferOwnership(msg.sender);
    }

    modifier onlyOwner() {
        require(msg.sender == owner(), "Must be owner");
        _;
    }

    function owner() public view override returns (address) {
        return _owner;
    }

    function transferOwnership(address _newOwner)
        public
        virtual
        override
        onlyOwner()
    {
        _transferOwnership(_newOwner);
    }

    function _transferOwnership(address _newOwner) internal {
        address previousOwner = owner();
        _owner = _newOwner;
        emit OwnershipTransferred(previousOwner, _newOwner);
    }
}


// File contracts3/roles/Operatable.sol


pragma solidity ^0.8.0;


abstract contract Operatable is ERC173 {
    using Roles for Roles.Role;

    event OperatorAdded(address indexed account);
    event OperatorRemoved(address indexed account);

    event Paused(address account);
    event Unpaused(address account);

    bool private _paused;
    Roles.Role private operators;

    constructor() {
        operators.add(msg.sender);
        _paused = false;
    }

    modifier onlyOperator() {
        require(isOperator(msg.sender), "Must be operator");
        _;
    }

    modifier whenNotPaused() {
        require(!_paused, "Pausable: paused");
        _;
    }

    modifier whenPaused() {
        require(_paused, "Pausable: not paused");
        _;
    }

    function transferOwnership(address _newOwner)
        public
        override
        onlyOperator()
    {
        _transferOwnership(_newOwner);
    }

    function isOperator(address account) public view returns (bool) {
        return operators.has(account);
    }

    function addOperator(address account) public onlyOperator() {
        operators.add(account);
        emit OperatorAdded(account);
    }

    function removeOperator(address account) public onlyOperator() {
        operators.remove(account);
        emit OperatorRemoved(account);
    }

    function paused() public view returns (bool) {
        return _paused;
    }

    function pause() public onlyOperator() whenNotPaused() {
        _paused = true;
        emit Paused(msg.sender);
    }

    function unpause() public onlyOperator() whenPaused() {
        _paused = false;
        emit Unpaused(msg.sender);
    }
}


// File contracts3/IApprovalProxy.sol

pragma solidity ^0.8.0;

interface IApprovalProxy {
  function setApprovalForAll(address _owner, address _spender, bool _approved) external;
  function isApprovedForAll(address _owner, address _spender, bool _original) external view returns (bool);
}


// File contracts3/BFHApprovalProxyV1.sol

pragma solidity ^0.8.0;



contract OwnableDelegateProxy { }
contract ProxyRegistry {
    mapping(address => OwnableDelegateProxy) public proxies;
    function set(address _owner, address _spender) external {
        proxies[_owner] = OwnableDelegateProxy(_spender);
    }
}

contract BFHApprovalProxyV1 is IApprovalProxy, Operatable {
    using Address for address;
    using Roles for Roles.Role;

    Roles.Role private approvableContracts;
    Roles.Role private preapprovedContracts;
    mapping (address => mapping (address => bool)) private _expresslyNotApprovalSpender;
    mapping (address => mapping (address => bool)) private _contractApprovals;

    ProxyRegistry public openSeaProxyRegistry;
    mapping (address => bool) private openSeaDisabled;

    event UpdateApprovableContracts (address spender, bool approved);
    event UpdatePreapprovedContracts (address spender, bool approved);

    modifier onlyContract(address _spender) {
        require(_spender.isContract(), "_spender must be contract");
        _;
    }

    constructor() {}

    function setApprovalForAll(address _owner, address _spender, bool _approved) override public onlyContract(_spender) onlyOperator() {
        require(isApprovableContract(_spender), "_spender must belong to approvable role");
        _expresslyNotApprovalSpender[_owner][_spender] = !_approved;
    }

    function isApprovedForAll(address _owner, address _spender, bool _original) override public view returns (bool) {
        if (approvalToOpenSea(_owner, _spender)) {
            return true;
        }
        if (_spender.isContract()) {
            if (!isApprovableContract(_spender)) {
                return false;
            }
            if (isPreapprovedContract(_spender)) {
                return !_expresslyNotApprovalSpender[_owner][_spender];
            }
        }
        return _original;
    }

    // OpenSea
    function setOpenSeaProxyRegistry(address _openSeaProxyRegistry) public onlyOperator() {
        openSeaProxyRegistry = ProxyRegistry(_openSeaProxyRegistry);
    }

    function enableOpenSea() public {
        openSeaDisabled[msg.sender] = false;
    }

    function disableOpenSea() public {
        openSeaDisabled[msg.sender] = true;
    }
    
    function getOpenSeaSpender(address _owner) public view returns (address) {
        return address(openSeaProxyRegistry.proxies(_owner));
    }

    function approvalToOpenSea(address _owner, address _spender) public view returns (bool) {
        if (address(openSeaProxyRegistry) == address(0x0)) {
            return false;
        }
        if (openSeaDisabled[_owner]) {
            return false;
        }
        return (getOpenSeaSpender(_owner) == _spender);
    }

    // Approvable list
    function setApprovableContracts(address _spender, bool _approvable) public onlyOperator() onlyContract(_spender) {
        emit UpdateApprovableContracts(_spender, _approvable);
        if (_approvable) {
            approvableContracts.add(_spender);
        } else {
            require(!isPreapprovedContract(_spender), "_spender must not be preapproval");
            approvableContracts.remove(_spender);
        }
    }

    function isApprovableContract(address _spender) public view returns (bool) {
        return approvableContracts.has(_spender);
    }

    function setPreapprovedContracts(address _spender, bool _approval) public onlyOperator() onlyContract(_spender) {
        require(isApprovableContract(_spender), "_spender must not be approvable");
        emit UpdatePreapprovedContracts(_spender, _approval);
        if (_approval) {
            preapprovedContracts.add(_spender);
        } else {
            preapprovedContracts.remove(_spender);
        }
    }

    function isPreapprovedContract(address _spender) public view returns (bool) {
        return preapprovedContracts.has(_spender);
    }

}

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