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0xF18ade29a225fAa555e475eE01F9Eb66eb4a3a74
 

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Approve206305462024-08-29 0:03:59104 days ago1724889839IN
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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0x69BbE2FA...C32786385
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
XToken

Compiler Version
v0.6.8+commit.0bbfe453

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity Multiple files format)

File 1 of 46: XToken.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./Ownable.sol";
import "./Context.sol";
import "./ERC20.sol";
import "./ERC20Burnable.sol";

contract XToken is Context, Ownable, ERC20Burnable {
    constructor(string memory name, string memory symbol, address _owner)
        public
        ERC20(name, symbol)
    {
        initOwnable();
        transferOwnership(_owner);
        _mint(msg.sender, 0);
    }

    function mint(address to, uint256 amount) public onlyOwner {
        _mint(to, amount);
    }

    function changeName(string memory name) public onlyOwner {
        _changeName(name);
    }

    function changeSymbol(string memory symbol) public onlyOwner {
        _changeSymbol(symbol);
    }
}

File 2 of 46: Address.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

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

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

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

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

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

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

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

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

    function _functionCallWithValue(
        address target,
        bytes memory data,
        uint256 weiValue,
        string memory errorMessage
    ) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{value: weiValue}(
            data
        );
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

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

File 3 of 46: Context.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

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

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

File 4 of 46: ControllerBase.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./Timelocked.sol";
import "./SafeMath.sol";
import "./Initializable.sol";

abstract contract ControllerBase is Timelocked {
    using SafeMath for uint256;

    address public leadDev;

    uint256 numFuncCalls;

    mapping(uint256 => uint256) public time;
    mapping(uint256 => uint256) public funcIndex;
    mapping(uint256 => address payable) public addressParam;
    mapping(uint256 => uint256[]) public uintArrayParam;

    function transferOwnership(address newOwner) public override virtual {
        uint256 fcId = numFuncCalls;
        numFuncCalls = numFuncCalls.add(1);
        time[fcId] = now;
        funcIndex[fcId] = 0;
        addressParam[fcId] = payable(newOwner);
    }

    function initialize() public initializer {
        initOwnable();
    }

    function setLeadDev(address newLeadDev) public virtual onlyOwner {
        leadDev = newLeadDev;
    }

    function stageFuncCall(
        uint256 _funcIndex,
        address payable _addressParam,
        uint256[] memory _uintArrayParam
    ) public virtual onlyOwner {
        uint256 fcId = numFuncCalls;
        numFuncCalls = numFuncCalls.add(1);
        time[fcId] = now;
        funcIndex[fcId] = _funcIndex;
        addressParam[fcId] = _addressParam;
        uintArrayParam[fcId] = _uintArrayParam;
    }

    function cancelFuncCall(uint256 fcId) public virtual onlyOwner {
        funcIndex[fcId] = 0;
    }

    function executeFuncCall(uint256 fcId) public virtual {
        if (funcIndex[fcId] == 0) {
            return;
        } else if (funcIndex[fcId] == 1) {
            require(
                    uintArrayParam[fcId][2] >= uintArrayParam[fcId][1] &&
                        uintArrayParam[fcId][1] >= uintArrayParam[fcId][0],
                    "Invalid delays"
                );
            if (uintArrayParam[fcId][2] != longDelay) {
                onlyIfPastDelay(2, time[fcId]);
            } else if (uintArrayParam[fcId][1] != mediumDelay) {
                onlyIfPastDelay(1, time[fcId]);
            } else {
                onlyIfPastDelay(0, time[fcId]);
            }
            setDelays(
                uintArrayParam[fcId][0],
                uintArrayParam[fcId][1],
                uintArrayParam[fcId][2]
            );
        } else if (funcIndex[fcId] == 2) {
            onlyIfPastDelay(1, time[fcId]);
            Ownable.transferOwnership(addressParam[fcId]);
        }
    }
}

File 5 of 46: Counter.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

contract Counter {
    uint256 internal number;

    function getNumber() public view returns (uint256) {
        return number;
    }

    function increaseNumberBy(uint256 amount) public {
        number += amount;
    }

}

File 6 of 46: D2Token.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./Ownable.sol";
import "./Context.sol";
import "./ERC20.sol";
import "./ERC20Burnable.sol";

contract D2Token is Context, Ownable, ERC20Burnable {
    address private vaultAddress;

    constructor(string memory name, string memory symbol)
        public
        ERC20(name, symbol)
    {
        initOwnable();
        _mint(msg.sender, 0);
    }

    function mint(address to, uint256 amount) public onlyOwner {
        _mint(to, amount);
    }
}

File 7 of 46: EnumerableMap.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Library for managing an enumerable variant of Solidity's
 * https://solidity.readthedocs.io/en/latest/types.html#mapping-types[`mapping`]
 * type.
 *
 * Maps have the following properties:
 *
 * - Entries are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Entries are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableMap for EnumerableMap.UintToAddressMap;
 *
 *     // Declare a set state variable
 *     EnumerableMap.UintToAddressMap private myMap;
 * }
 * ```
 *
 * As of v3.0.0, only maps of type `uint256 -> address` (`UintToAddressMap`) are
 * supported.
 */
library EnumerableMap {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Map type with
    // bytes32 keys and values.
    // The Map implementation uses private functions, and user-facing
    // implementations (such as Uint256ToAddressMap) are just wrappers around
    // the underlying Map.
    // This means that we can only create new EnumerableMaps for types that fit
    // in bytes32.

    struct MapEntry {
        bytes32 _key;
        bytes32 _value;
    }

    struct Map {
        // Storage of map keys and values
        MapEntry[] _entries;

        // Position of the entry defined by a key in the `entries` array, plus 1
        // because index 0 means a key is not in the map.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function _set(Map storage map, bytes32 key, bytes32 value) private returns (bool) {
        // We read and store the key's index to prevent multiple reads from the same storage slot
        uint256 keyIndex = map._indexes[key];

        if (keyIndex == 0) { // Equivalent to !contains(map, key)
            map._entries.push(MapEntry({ _key: key, _value: value }));
            // The entry is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            map._indexes[key] = map._entries.length;
            return true;
        } else {
            map._entries[keyIndex - 1]._value = value;
            return false;
        }
    }

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

        if (keyIndex != 0) { // Equivalent to contains(map, key)
            // To delete a key-value pair from the _entries array in O(1), we swap the entry to delete with the last one
            // in the array, and then remove the last entry (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = keyIndex - 1;
            uint256 lastIndex = map._entries.length - 1;

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

            MapEntry storage lastEntry = map._entries[lastIndex];

            // Move the last entry to the index where the entry to delete is
            map._entries[toDeleteIndex] = lastEntry;
            // Update the index for the moved entry
            map._indexes[lastEntry._key] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved entry was stored
            map._entries.pop();

            // Delete the index for the deleted slot
            delete map._indexes[key];

            return true;
        } else {
            return false;
        }
    }

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

    /**
     * @dev Returns the number of key-value pairs in the map. O(1).
     */
    function _length(Map storage map) private view returns (uint256) {
        return map._entries.length;
    }

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

        MapEntry storage entry = map._entries[index];
        return (entry._key, entry._value);
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function _get(Map storage map, bytes32 key) private view returns (bytes32) {
        return _get(map, key, "EnumerableMap: nonexistent key");
    }

    /**
     * @dev Same as {_get}, with a custom error message when `key` is not in the map.
     */
    function _get(Map storage map, bytes32 key, string memory errorMessage) private view returns (bytes32) {
        uint256 keyIndex = map._indexes[key];
        require(keyIndex != 0, errorMessage); // Equivalent to contains(map, key)
        return map._entries[keyIndex - 1]._value; // All indexes are 1-based
    }

    // UintToAddressMap

    struct UintToAddressMap {
        Map _inner;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function set(UintToAddressMap storage map, uint256 key, address value) internal returns (bool) {
        return _set(map._inner, bytes32(key), bytes32(uint256(value)));
    }

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

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

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

   /**
    * @dev Returns the element stored at position `index` in the set. O(1).
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(UintToAddressMap storage map, uint256 index) internal view returns (uint256, address) {
        (bytes32 key, bytes32 value) = _at(map._inner, index);
        return (uint256(key), address(uint256(value)));
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function get(UintToAddressMap storage map, uint256 key) internal view returns (address) {
        return address(uint256(_get(map._inner, bytes32(key))));
    }

    /**
     * @dev Same as {get}, with a custom error message when `key` is not in the map.
     */
    function get(UintToAddressMap storage map, uint256 key, string memory errorMessage) internal view returns (address) {
        return address(uint256(_get(map._inner, bytes32(key), errorMessage)));
    }
}

File 8 of 46: EnumerableSet.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

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

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

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

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

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

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

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

            bytes32 lastvalue = set._values[lastIndex];

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

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

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

            return true;
        } else {
            return false;
        }
    }

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

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

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

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

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

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

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

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

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

    // UintSet

    struct UintSet {
        Set _inner;
    }

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

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

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

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

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

File 9 of 46: ERC165.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts may inherit from this and call {_registerInterface} to declare
 * their support of an interface.
 */
contract ERC165 is IERC165 {
    /*
     * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7
     */
    bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;

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

    constructor () internal {
        // Derived contracts need only register support for their own interfaces,
        // we register support for ERC165 itself here
        _registerInterface(_INTERFACE_ID_ERC165);
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     *
     * Time complexity O(1), guaranteed to always use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) public view override returns (bool) {
        return _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;
    }
}

File 10 of 46: ERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./Context.sol";
import "./IERC20.sol";
import "./SafeMath.sol";
import "./Address.sol";

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

    mapping(address => uint256) private _balances;

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

    uint256 private _totalSupply;

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

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

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

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

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }

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

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

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

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

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount)
        public
        virtual
        override
        returns (bool)
    {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount)
        public
        virtual
        override
        returns (bool)
    {
        _transfer(sender, recipient, amount);
        _approve(
            sender,
            _msgSender(),
            _allowances[sender][_msgSender()].sub(
                amount,
                "ERC20: transfer amount exceeds allowance"
            )
        );
        return true;
    }

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

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

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

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(
            amount,
            "ERC20: transfer amount exceeds balance"
        );
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

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

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

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

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

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

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

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

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

    function _changeName(string memory name_) internal {
        _name = name_;
    }

    function _changeSymbol(string memory symbol_) internal {
        _symbol = symbol_;
    }

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

File 11 of 46: ERC20Burnable.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./Context.sol";
import "./ERC20.sol";

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

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

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

File 12 of 46: ERC721.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "./Context.sol";
import "./IERC721.sol";
import "./IERC721Metadata.sol";
import "./IERC721Enumerable.sol";
import "./IERC721Receiver.sol";
import "./ERC165.sol";
import "./SafeMath.sol";
import "./Address.sol";
import "./EnumerableSet.sol";
import "./EnumerableMap.sol";
import "./Strings.sol";

/**
 * @title ERC721 Non-Fungible Token Standard basic implementation
 * @dev see https://eips.ethereum.org/EIPS/eip-721
 */
contract ERC721 is
    Context,
    ERC165,
    IERC721,
    IERC721Metadata,
    IERC721Enumerable
{
    using SafeMath for uint256;
    using Address for address;
    using EnumerableSet for EnumerableSet.UintSet;
    using EnumerableMap for EnumerableMap.UintToAddressMap;
    using Strings for uint256;

    // Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
    // which can be also obtained as `IERC721Receiver(0).onERC721Received.selector`
    bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;

    // Mapping from holder address to their (enumerable) set of owned tokens
    mapping(address => EnumerableSet.UintSet) private _holderTokens;

    // Enumerable mapping from token ids to their owners
    EnumerableMap.UintToAddressMap private _tokenOwners;

    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Optional mapping for token URIs
    mapping(uint256 => string) private _tokenURIs;

    // Base URI
    string private _baseURI;

    /*
     *     bytes4(keccak256('balanceOf(address)')) == 0x70a08231
     *     bytes4(keccak256('ownerOf(uint256)')) == 0x6352211e
     *     bytes4(keccak256('approve(address,uint256)')) == 0x095ea7b3
     *     bytes4(keccak256('getApproved(uint256)')) == 0x081812fc
     *     bytes4(keccak256('setApprovalForAll(address,bool)')) == 0xa22cb465
     *     bytes4(keccak256('isApprovedForAll(address,address)')) == 0xe985e9c5
     *     bytes4(keccak256('transferFrom(address,address,uint256)')) == 0x23b872dd
     *     bytes4(keccak256('safeTransferFrom(address,address,uint256)')) == 0x42842e0e
     *     bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) == 0xb88d4fde
     *
     *     => 0x70a08231 ^ 0x6352211e ^ 0x095ea7b3 ^ 0x081812fc ^
     *        0xa22cb465 ^ 0xe985e9c5 ^ 0x23b872dd ^ 0x42842e0e ^ 0xb88d4fde == 0x80ac58cd
     */
    bytes4 private constant _INTERFACE_ID_ERC721 = 0x80ac58cd;

    /*
     *     bytes4(keccak256('name()')) == 0x06fdde03
     *     bytes4(keccak256('symbol()')) == 0x95d89b41
     *     bytes4(keccak256('tokenURI(uint256)')) == 0xc87b56dd
     *
     *     => 0x06fdde03 ^ 0x95d89b41 ^ 0xc87b56dd == 0x5b5e139f
     */
    bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x5b5e139f;

    /*
     *     bytes4(keccak256('totalSupply()')) == 0x18160ddd
     *     bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) == 0x2f745c59
     *     bytes4(keccak256('tokenByIndex(uint256)')) == 0x4f6ccce7
     *
     *     => 0x18160ddd ^ 0x2f745c59 ^ 0x4f6ccce7 == 0x780e9d63
     */
    bytes4 private constant _INTERFACE_ID_ERC721_ENUMERABLE = 0x780e9d63;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name, string memory symbol) public {
        _name = name;
        _symbol = symbol;

        // register the supported interfaces to conform to ERC721 via ERC165
        _registerInterface(_INTERFACE_ID_ERC721);
        _registerInterface(_INTERFACE_ID_ERC721_METADATA);
        _registerInterface(_INTERFACE_ID_ERC721_ENUMERABLE);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view override returns (uint256) {
        require(
            owner != address(0),
            "ERC721: balance query for the zero address"
        );

        return _holderTokens[owner].length();
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view override returns (address) {
        return
            _tokenOwners.get(
                tokenId,
                "ERC721: owner query for nonexistent token"
            );
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId)
        public
        view
        override
        returns (string memory)
    {
        require(
            _exists(tokenId),
            "ERC721Metadata: URI query for nonexistent token"
        );

        string memory _tokenURI = _tokenURIs[tokenId];

        // If there is no base URI, return the token URI.
        if (bytes(_baseURI).length == 0) {
            return _tokenURI;
        }
        // If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).
        if (bytes(_tokenURI).length > 0) {
            return string(abi.encodePacked(_baseURI, _tokenURI));
        }
        // If there is a baseURI but no tokenURI, concatenate the tokenID to the baseURI.
        return string(abi.encodePacked(_baseURI, tokenId.toString()));
    }

    /**
     * @dev Returns the base URI set via {_setBaseURI}. This will be
     * automatically added as a prefix in {tokenURI} to each token's URI, or
     * to the token ID if no specific URI is set for that token ID.
     */
    function baseURI() public view returns (string memory) {
        return _baseURI;
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index)
        public
        view
        override
        returns (uint256)
    {
        return _holderTokens[owner].at(index);
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view override returns (uint256) {
        // _tokenOwners are indexed by tokenIds, so .length() returns the number of tokenIds
        return _tokenOwners.length();
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index)
        public
        view
        override
        returns (uint256)
    {
        (uint256 tokenId, ) = _tokenOwners.at(index);
        return tokenId;
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId)
        public
        view
        override
        returns (address)
    {
        require(
            _exists(tokenId),
            "ERC721: approved query for nonexistent token"
        );

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved)
        public
        virtual
        override
    {
        require(operator != _msgSender(), "ERC721: approve to caller");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator)
        public
        view
        override
        returns (bool)
    {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(address from, address to, uint256 tokenId)
        public
        virtual
        override
    {
        //solhint-disable-next-line max-line-length
        require(
            _isApprovedOrOwner(_msgSender(), tokenId),
            "ERC721: transfer caller is not owner nor approved"
        );

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId)
        public
        virtual
        override
    {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        require(
            _isApprovedOrOwner(_msgSender(), tokenId),
            "ERC721: transfer caller is not owner nor approved"
        );
        _safeTransfer(from, to, tokenId, _data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(
            _checkOnERC721Received(from, to, tokenId, _data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view returns (bool) {
        return _tokenOwners.contains(tokenId);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId)
        internal
        view
        returns (bool)
    {
        require(
            _exists(tokenId),
            "ERC721: operator query for nonexistent token"
        );
        address owner = ownerOf(tokenId);
        return (spender == owner ||
            getApproved(tokenId) == spender ||
            isApprovedForAll(owner, spender));
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     d*
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    // For testing
    function safeMint(address to, uint256 tokenId) public virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(address to, uint256 tokenId, bytes memory _data)
        internal
        virtual
    {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, _data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId);

        _holderTokens[to].add(tokenId);

        _tokenOwners.set(tokenId, to);

        emit Transfer(address(0), to, tokenId);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId);

        // Clear approvals
        _approve(address(0), tokenId);

        // Clear metadata (if any)
        if (bytes(_tokenURIs[tokenId]).length != 0) {
            delete _tokenURIs[tokenId];
        }

        _holderTokens[owner].remove(tokenId);

        _tokenOwners.remove(tokenId);

        emit Transfer(owner, address(0), tokenId);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(address from, address to, uint256 tokenId)
        internal
        virtual
    {
        require(
            ownerOf(tokenId) == from,
            "ERC721: transfer of token that is not own"
        );
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);

        _holderTokens[from].remove(tokenId);
        _holderTokens[to].add(tokenId);

        _tokenOwners.set(tokenId, to);

        emit Transfer(from, to, tokenId);
    }

    /**
     * @dev Sets `_tokenURI` as the tokenURI of `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _setTokenURI(uint256 tokenId, string memory _tokenURI)
        internal
        virtual
    {
        require(
            _exists(tokenId),
            "ERC721Metadata: URI set of nonexistent token"
        );
        _tokenURIs[tokenId] = _tokenURI;
    }

    /**
     * @dev Internal function to set the base URI for all token IDs. It is
     * automatically added as a prefix to the value returned in {tokenURI},
     * or to the token ID if {tokenURI} is empty.
     */
    function _setBaseURI(string memory baseURI_) internal virtual {
        _baseURI = baseURI_;
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-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 bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) private returns (bool) {
        if (!to.isContract()) {
            return true;
        }
        bytes memory returndata = to.functionCall(
            abi.encodeWithSelector(
                IERC721Receiver(to).onERC721Received.selector,
                _msgSender(),
                from,
                tokenId,
                _data
            ),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
        bytes4 retval = abi.decode(returndata, (bytes4));
        return (retval == _ERC721_RECEIVED);
    }

    function _approve(address to, uint256 tokenId) private {
        _tokenApprovals[tokenId] = to;
        emit Approval(ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 tokenId)
        internal
        virtual
    {}
}

File 13 of 46: ERC721Holder.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "./IERC721Receiver.sol";

/**
 * @dev Implementation of the {IERC721Receiver} interface.
 *
 * Accepts all token transfers.
 * Make sure the contract is able to use its token with {IERC721-safeTransferFrom}, {IERC721-approve} or {IERC721-setApprovalForAll}.
 */
contract ERC721Holder is IERC721Receiver {
    /**
     * @dev See {IERC721Receiver-onERC721Received}.
     *
     * Always returns `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address,
        address,
        uint256,
        bytes memory
    ) public virtual override returns (bytes4) {
        return this.onERC721Received.selector;
    }
}

File 14 of 46: ERC721Public.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./Context.sol";
import "./ERC721.sol";

contract ERC721Public is Context, ERC721 {
    uint256 public minTokenId;
    uint256 public maxTokenId;

    constructor(
        string memory name,
        string memory symbol,
        uint256 _minTokenId,
        uint256 _maxTokenId
    ) public ERC721(name, symbol) {
        minTokenId = _minTokenId;
        maxTokenId = _maxTokenId;
    }

    function mint(uint256 tokenId, address recipient) public {
        require(tokenId >= minTokenId, "tokenId < minTokenId");
        require(tokenId <= maxTokenId, "tokenId > maxTokenId");
        _mint(recipient, tokenId);
    }

}

File 15 of 46: IERC165.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @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 IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

File 16 of 46: IERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

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

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

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

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

File 17 of 46: IERC721.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

import "./IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @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
    );

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId)
        external
        view
        returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator)
        external
        view
        returns (bool);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}

File 18 of 46: IERC721Enumerable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

import "./IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {

    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

File 19 of 46: IERC721Metadata.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

import "./IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {

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

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

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

File 20 of 46: IERC721Plus.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

import "./IERC721.sol";

interface IERC721Plus is IERC721 {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
}

File 21 of 46: IERC721Receiver.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @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);
}

File 22 of 46: INFTX.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./Pausable.sol";
import "./IXToken.sol";
import "./IERC721.sol";
import "./EnumerableSet.sol";
import "./ReentrancyGuard.sol";
import "./SafeMath.sol";

interface INFTX {
    event NFTsDeposited(uint256 vaultId, uint256[] nftIds, address from);
    event NFTsRedeemed(uint256 vaultId, uint256[] nftIds, address to);
    event TokensMinted(uint256 vaultId, uint256 amount, address to);
    event TokensBurned(uint256 vaultId, uint256 amount, address from);

    event EligibilitySet(uint256 vaultId, uint256[] nftIds, bool _boolean);
    event ReservesIncreased(uint256 vaultId, uint256 nftId);
    event ReservesDecreased(uint256 vaultId, uint256 nftId);

    function store() external returns (address);

    function transferOwnership(address newOwner) external;

    function vaultSize(uint256 vaultId) external view returns (uint256);

    function isEligible(uint256 vaultId, uint256 nftId)
        external
        view
        returns (bool);

    function createVault(address _erc20Address, address _nftAddress)
        external
        returns (uint256);

    function depositETH(uint256 vaultId) external payable;

    function setIsEligible(
        uint256 vaultId,
        uint256[] calldata nftIds,
        bool _boolean
    ) external;

    function setNegateEligibility(uint256 vaultId, bool shouldNegate) external;

    function setShouldReserve(
        uint256 vaultId,
        uint256[] calldata nftIds,
        bool _boolean
    ) external;

    function setIsReserved(
        uint256 vaultId,
        uint256[] calldata nftIds,
        bool _boolean
    ) external;

    function setExtension(address contractAddress, bool _boolean) external;

    function directRedeem(uint256 vaultId, uint256[] calldata nftIds)
        external
        payable;

    function mint(uint256 vaultId, uint256[] calldata nftIds, uint256 d2Amount)
        external
        payable;

    function redeem(uint256 vaultId, uint256 numNFTs) external payable;

    function mintAndRedeem(uint256 vaultId, uint256[] calldata nftIds)
        external
        payable;

    function changeTokenName(uint256 vaultId, string calldata newName) external;

    function changeTokenSymbol(uint256 vaultId, string calldata newSymbol)
        external;

    function setManager(uint256 vaultId, address newManager) external;

    function finalizeVault(uint256 vaultId) external;

    function closeVault(uint256 vaultId) external;

    function setMintFees(uint256 vaultId, uint256 _ethBase, uint256 _ethStep)
        external;

    function setBurnFees(uint256 vaultId, uint256 _ethBase, uint256 _ethStep)
        external;

    function setDualFees(uint256 vaultId, uint256 _ethBase, uint256 _ethStep)
        external;

    function setSupplierBounty(uint256 vaultId, uint256 ethMax, uint256 length)
        external;
}

File 23 of 46: Initializable.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.4.24 <0.7.0;

/**
 * @title Initializable
 *
 * @dev Helper contract to support initializer functions. To use it, replace
 * the constructor with a function that has the `initializer` modifier.
 * WARNING: Unlike constructors, initializer functions must be manually
 * invoked. This applies both to deploying an Initializable contract, as well
 * as extending an Initializable contract via inheritance.
 * WARNING: When used with inheritance, manual care must be taken to not invoke
 * a parent initializer twice, or ensure that all initializers are idempotent,
 * because this is not dealt with automatically as with constructors.
 */
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 use in the initializer function of a contract.
   */
    modifier initializer() {
        require(
            initializing || isConstructor() || !initialized,
            "Contract instance has already been initialized"
        );

        bool isTopLevelCall = !initializing;
        if (isTopLevelCall) {
            initializing = true;
            initialized = true;
        }

        _;

        if (isTopLevelCall) {
            initializing = false;
        }
    }

    /// @dev Returns true if and only if the function is running in the constructor
    function isConstructor() private view returns (bool) {
        // extcodesize checks the size of the code stored in an address, and
        // address returns the current address. Since the code is still not
        // deployed when running a constructor, any checks on its code size will
        // yield zero, making it an effective way to detect if a contract is
        // under construction or not.
        address self = address(this);
        uint256 cs;
        assembly {
            cs := extcodesize(self)
        }
        return cs == 0;
    }

    // Reserved storage space to allow for layout changes in the future.
    uint256[50] private ______gap;
}

File 24 of 46: ITokenManager.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

interface ITokenManager {
    function mint(address _receiver, uint256 _amount) external;
    function issue(uint256 _amount) external;
    function assign(address _receiver, uint256 _amount) external;
    function burn(address _holder, uint256 _amount) external;
    function assignVested(
        address _receiver,
        uint256 _amount,
        uint64 _start,
        uint64 _cliff,
        uint64 _vested,
        bool _revokable
    ) external returns (uint256);
    function revokeVesting(address _holder, uint256 _vestingId) external;
}

File 25 of 46: ITransparentUpgradeableProxy.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

interface ITransparentUpgradeableProxy {
    function admin() external returns (address);

    function implementation() external returns (address);

    function changeAdmin(address newAdmin) external;

    function upgradeTo(address newImplementation) external;

    function upgradeToAndCall(address newImplementation, bytes calldata data)
        external
        payable;
}

File 26 of 46: IXStore.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./EnumerableSet.sol";
import "./Ownable.sol";
import "./SafeMath.sol";
import "./IXToken.sol";
import "./IERC721.sol";
import "./EnumerableSet.sol";

interface IXStore {
    struct FeeParams {
        uint256 ethBase;
        uint256 ethStep;
    }

    struct BountyParams {
        uint256 ethMax;
        uint256 length;
    }

    struct Vault {
        address xTokenAddress;
        address nftAddress;
        address manager;
        IXToken xToken;
        IERC721 nft;
        EnumerableSet.UintSet holdings;
        EnumerableSet.UintSet reserves;
        mapping(uint256 => address) requester;
        mapping(uint256 => bool) isEligible;
        mapping(uint256 => bool) shouldReserve;
        bool allowMintRequests;
        bool flipEligOnRedeem;
        bool negateEligibility;
        bool isFinalized;
        bool isClosed;
        FeeParams mintFees;
        FeeParams burnFees;
        FeeParams dualFees;
        BountyParams supplierBounty;
        uint256 ethBalance;
        uint256 tokenBalance;
        bool isD2Vault;
        address d2AssetAddress;
        IERC20 d2Asset;
        uint256 d2Holdings;
    }

    function isExtension(address addr) external view returns (bool);

    function randNonce() external view returns (uint256);

    function vaultsLength() external view returns (uint256);

    function xTokenAddress(uint256 vaultId) external view returns (address);

    function nftAddress(uint256 vaultId) external view returns (address);

    function manager(uint256 vaultId) external view returns (address);

    function xToken(uint256 vaultId) external view returns (IXToken);

    function nft(uint256 vaultId) external view returns (IERC721);

    function holdingsLength(uint256 vaultId) external view returns (uint256);

    function holdingsContains(uint256 vaultId, uint256 elem)
        external
        view
        returns (bool);

    function holdingsAt(uint256 vaultId, uint256 index)
        external
        view
        returns (uint256);

    function reservesLength(uint256 vaultId) external view returns (uint256);

    function reservesContains(uint256 vaultId, uint256 elem)
        external
        view
        returns (bool);

    function reservesAt(uint256 vaultId, uint256 index)
        external
        view
        returns (uint256);

    function requester(uint256 vaultId, uint256 id)
        external
        view
        returns (address);

    function isEligible(uint256 vaultId, uint256 id)
        external
        view
        returns (bool);

    function shouldReserve(uint256 vaultId, uint256 id)
        external
        view
        returns (bool);

    function allowMintRequests(uint256 vaultId) external view returns (bool);

    function flipEligOnRedeem(uint256 vaultId) external view returns (bool);

    function negateEligibility(uint256 vaultId) external view returns (bool);

    function isFinalized(uint256 vaultId) external view returns (bool);

    function isClosed(uint256 vaultId) external view returns (bool);

    function mintFees(uint256 vaultId) external view returns (uint256, uint256);

    function burnFees(uint256 vaultId) external view returns (uint256, uint256);

    function dualFees(uint256 vaultId) external view returns (uint256, uint256);

    function supplierBounty(uint256 vaultId)
        external
        view
        returns (uint256, uint256);

    function ethBalance(uint256 vaultId) external view returns (uint256);

    function tokenBalance(uint256 vaultId) external view returns (uint256);

    function isD2Vault(uint256 vaultId) external view returns (bool);

    function d2AssetAddress(uint256 vaultId) external view returns (address);

    function d2Asset(uint256 vaultId) external view returns (IERC20);

    function d2Holdings(uint256 vaultId) external view returns (uint256);

    function setXTokenAddress(uint256 vaultId, address _xTokenAddress) external;

    function setNftAddress(uint256 vaultId, address _assetAddress) external;

    function setManager(uint256 vaultId, address _manager) external;

    function setXToken(uint256 vaultId) external;

    function setNft(uint256 vaultId) external;

    function holdingsAdd(uint256 vaultId, uint256 elem) external;

    function holdingsRemove(uint256 vaultId, uint256 elem) external;

    function reservesAdd(uint256 vaultId, uint256 elem) external;

    function reservesRemove(uint256 vaultId, uint256 elem) external;

    function setRequester(uint256 vaultId, uint256 id, address _requester)
        external;

    function setIsEligible(uint256 vaultId, uint256 id, bool _bool) external;

    function setShouldReserve(uint256 vaultId, uint256 id, bool _shouldReserve)
        external;

    function setAllowMintRequests(uint256 vaultId, bool isAllowed) external;

    function setFlipEligOnRedeem(uint256 vaultId, bool flipElig) external;

    function setNegateEligibility(uint256 vaultId, bool negateElig) external;

    function setIsFinalized(uint256 vaultId, bool _isFinalized) external;

    function setIsClosed(uint256 vaultId, bool _isClosed) external;

    function setMintFees(uint256 vaultId, uint256 ethBase, uint256 ethStep)
        external;

    function setBurnFees(uint256 vaultId, uint256 ethBase, uint256 ethStep)
        external;

    function setDualFees(uint256 vaultId, uint256 ethBase, uint256 ethStep)
        external;

    function setSupplierBounty(uint256 vaultId, uint256 ethMax, uint256 length)
        external;

    function setEthBalance(uint256 vaultId, uint256 _ethBalance) external;

    function setTokenBalance(uint256 vaultId, uint256 _tokenBalance) external;

    function setIsD2Vault(uint256 vaultId, bool _isD2Vault) external;

    function setD2AssetAddress(uint256 vaultId, address _assetAddress) external;

    function setD2Asset(uint256 vaultId) external;

    function setD2Holdings(uint256 vaultId, uint256 _d2Holdings) external;

    ////////////////////////////////////////////////////////////

    function setIsExtension(address addr, bool _isExtension) external;

    function setRandNonce(uint256 _randNonce) external;

    function addNewVault() external returns (uint256);
}

File 27 of 46: IXToken.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./IERC20.sol";

interface IXToken is IERC20 {
    function owner() external returns (address);

    function burn(uint256 amount) external;

    function burnFrom(address account, uint256 amount) external;

    function mint(address to, uint256 amount) external;

    function changeName(string calldata name) external;

    function changeSymbol(string calldata symbol) external;

    function setVaultAddress(address vaultAddress) external;

    function transferOwnership(address newOwner) external;
}

File 28 of 46: KittyTest.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./IERC721.sol";
import "./ERC721Holder.sol";

contract KittyTest is ERC721Holder {
    address public kittyCoreAddress = 0x06012c8cf97BEaD5deAe237070F9587f8E7A266d;
    KittyCore kittyCore;
    IERC721 kittyNft;

    constructor() public {
        kittyCore = KittyCore(kittyCoreAddress);
        kittyNft = IERC721(kittyCoreAddress);
    }

    function testA1(uint256 tokenId, address toAddress) public {
        kittyNft.transferFrom(msg.sender, toAddress, tokenId);
    }

    function testA2(uint256 tokenId, address toAddress) public {
        kittyCore.transferFrom(msg.sender, toAddress, tokenId);
    }

    function testB1(uint256 tokenId, address toAddress) public {
        kittyNft.transferFrom(msg.sender, toAddress, tokenId);
    }

    function testB2(uint256 tokenId, address toAddress) public {
        kittyCore.transferFrom(msg.sender, toAddress, tokenId);
    }

    function depositA(uint256 tokenId) public {
        kittyNft.transferFrom(msg.sender, address(this), tokenId);
    }

    function depositB(uint256 tokenId) public {
        kittyCore.transferFrom(msg.sender, address(this), tokenId);
    }

    function withdrawA(uint256 tokenId) public {
        kittyNft.transferFrom(address(this), msg.sender, tokenId);
    }

    function withdrawB(uint256 tokenId) public {
        kittyCore.transferFrom(address(this), msg.sender, tokenId);
    }
}

interface KittyCore {
    function ownerOf(uint256 _tokenId) external view returns (address owner);
    function transferFrom(address _from, address _to, uint256 _tokenId)
        external;
    function transfer(address _to, uint256 _tokenId) external;
    function getKitty(uint256 _id)
        external
        view
        returns (
            bool,
            bool,
            uint256 _cooldownIndex,
            uint256,
            uint256,
            uint256,
            uint256,
            uint256,
            uint256 _generation,
            uint256
        );
    function kittyIndexToApproved(uint256 index)
        external
        view
        returns (address approved);
}

File 29 of 46: NFTX.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./Pausable.sol";
import "./IXToken.sol";
import "./IERC721.sol";
import "./ReentrancyGuard.sol";
import "./ERC721Holder.sol";
import "./IXStore.sol";
import "./Initializable.sol";
import "./SafeERC20.sol";

contract NFTX is Pausable, ReentrancyGuard, ERC721Holder {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    event NewVault(uint256 indexed vaultId, address sender);
    event Mint(
        uint256 indexed vaultId,
        uint256[] nftIds,
        uint256 d2Amount,
        address sender
    );
    event Redeem(
        uint256 indexed vaultId,
        uint256[] nftIds,
        uint256 d2Amount,
        address sender
    );
    event MintRequested(
        uint256 indexed vaultId,
        uint256[] nftIds,
        address sender
    );

    IXStore public store;

    function initialize(address storeAddress) public initializer {
        initOwnable();
        initReentrancyGuard();
        store = IXStore(storeAddress);
    }

    /* function onlyManager(uint256 vaultId) internal view {
        
    } */

    function onlyPrivileged(uint256 vaultId) internal view {
        if (store.isFinalized(vaultId)) {
            require(msg.sender == owner(), "Not owner");
        } else {
            require(msg.sender == store.manager(vaultId), "Not manager");
        }
    }

    function isEligible(uint256 vaultId, uint256 nftId)
        public
        view
        virtual
        returns (bool)
    {
        return
            store.negateEligibility(vaultId)
                ? !store.isEligible(vaultId, nftId)
                : store.isEligible(vaultId, nftId);
    }

    function vaultSize(uint256 vaultId) public view virtual returns (uint256) {
        return
            store.isD2Vault(vaultId)
                ? store.d2Holdings(vaultId)
                : store.holdingsLength(vaultId).add(
                    store.reservesLength(vaultId)
                );
    }

    function _getPseudoRand(uint256 modulus)
        internal
        virtual
        returns (uint256)
    {
        store.setRandNonce(store.randNonce().add(1));
        return
            uint256(
                keccak256(abi.encodePacked(now, msg.sender, store.randNonce()))
            ) %
            modulus;
    }

    function _calcFee(
        uint256 amount,
        uint256 ethBase,
        uint256 ethStep,
        bool isD2
    ) internal pure virtual returns (uint256) {
        if (amount == 0) {
            return 0;
        } else if (isD2) {
            return ethBase.add(ethStep.mul(amount.sub(10**18)).div(10**18));
        } else {
            uint256 n = amount;
            uint256 nSub1 = amount >= 1 ? n.sub(1) : 0;
            return ethBase.add(ethStep.mul(nSub1));
        }
    }

    function _calcBounty(uint256 vaultId, uint256 numTokens, bool isBurn)
        public
        view
        virtual
        returns (uint256)
    {
        (, uint256 length) = store.supplierBounty(vaultId);
        if (length == 0) return 0;
        uint256 ethBounty = 0;
        for (uint256 i = 0; i < numTokens; i = i.add(1)) {
            uint256 _vaultSize = isBurn
                ? vaultSize(vaultId).sub(i.add(1))
                : vaultSize(vaultId).add(i);
            uint256 _ethBounty = _calcBountyHelper(vaultId, _vaultSize);
            ethBounty = ethBounty.add(_ethBounty);
        }
        return ethBounty;
    }

    function _calcBountyD2(uint256 vaultId, uint256 amount, bool isBurn)
        public
        view
        virtual
        returns (uint256)
    {
        (uint256 ethMax, uint256 length) = store.supplierBounty(vaultId);
        if (length == 0) return 0;
        uint256 prevSize = vaultSize(vaultId);
        uint256 prevDepth = prevSize > length ? 0 : length.sub(prevSize);
        uint256 prevReward = _calcBountyD2Helper(ethMax, length, prevSize);
        uint256 newSize = isBurn
            ? vaultSize(vaultId).sub(amount)
            : vaultSize(vaultId).add(amount);
        uint256 newDepth = newSize > length ? 0 : length.sub(newSize);
        uint256 newReward = _calcBountyD2Helper(ethMax, length, newSize);
        uint256 prevTriangle = prevDepth.mul(prevReward).div(2).div(10**18);
        uint256 newTriangle = newDepth.mul(newReward).div(2).div(10**18);
        return
            isBurn
                ? newTriangle.sub(prevTriangle)
                : prevTriangle.sub(newTriangle);
    }

    function _calcBountyD2Helper(uint256 ethMax, uint256 length, uint256 size)
        internal
        pure
        returns (uint256)
    {
        if (size >= length) return 0;
        return ethMax.sub(ethMax.mul(size).div(length));
    }

    function _calcBountyHelper(uint256 vaultId, uint256 _vaultSize)
        internal
        view
        virtual
        returns (uint256)
    {
        (uint256 ethMax, uint256 length) = store.supplierBounty(vaultId);
        if (_vaultSize >= length) return 0;
        uint256 depth = length.sub(_vaultSize);
        return ethMax.mul(depth).div(length);
    }

    function createVault(
        address _xTokenAddress,
        address _assetAddress,
        bool _isD2Vault
    ) public virtual nonReentrant returns (uint256) {
        onlyOwnerIfPaused(0);
        IXToken xToken = IXToken(_xTokenAddress);
        require(xToken.owner() == address(this), "Wrong owner");
        uint256 vaultId = store.addNewVault();
        store.setXTokenAddress(vaultId, _xTokenAddress);

        store.setXToken(vaultId);
        if (!_isD2Vault) {
            store.setNftAddress(vaultId, _assetAddress);
            store.setNft(vaultId);
            store.setNegateEligibility(vaultId, true);
        } else {
            store.setD2AssetAddress(vaultId, _assetAddress);
            store.setD2Asset(vaultId);
            store.setIsD2Vault(vaultId, true);
        }
        store.setManager(vaultId, msg.sender);
        emit NewVault(vaultId, msg.sender);
        return vaultId;
    }

    function depositETH(uint256 vaultId) public payable virtual {
        store.setEthBalance(vaultId, store.ethBalance(vaultId).add(msg.value));
    }

    function _payEthFromVault(
        uint256 vaultId,
        uint256 amount,
        address payable to
    ) internal virtual {
        uint256 ethBalance = store.ethBalance(vaultId);
        uint256 amountToSend = ethBalance < amount ? ethBalance : amount;
        if (amountToSend > 0) {
            store.setEthBalance(vaultId, ethBalance.sub(amountToSend));
            to.transfer(amountToSend);
        }
    }

    function _receiveEthToVault(
        uint256 vaultId,
        uint256 amountRequested,
        uint256 amountSent
    ) internal virtual {
        require(amountSent >= amountRequested, "Value too low");
        store.setEthBalance(
            vaultId,
            store.ethBalance(vaultId).add(amountRequested)
        );
        if (amountSent > amountRequested) {
            msg.sender.transfer(amountSent.sub(amountRequested));
        }
    }

    function requestMint(uint256 vaultId, uint256[] memory nftIds)
        public
        payable
        virtual
        nonReentrant
    {
        onlyOwnerIfPaused(1);
        require(store.allowMintRequests(vaultId), "Not allowed");
        // TODO: implement bounty + fees
        for (uint256 i = 0; i < nftIds.length; i = i.add(1)) {
            require(
                store.nft(vaultId).ownerOf(nftIds[i]) != address(this),
                "Already owner"
            );
            store.nft(vaultId).safeTransferFrom(
                msg.sender,
                address(this),
                nftIds[i]
            );
            require(
                store.nft(vaultId).ownerOf(nftIds[i]) == address(this),
                "Not received"
            );
            store.setRequester(vaultId, nftIds[i], msg.sender);
        }
        emit MintRequested(vaultId, nftIds, msg.sender);
    }

    function revokeMintRequests(uint256 vaultId, uint256[] memory nftIds)
        public
        virtual
        nonReentrant
    {
        for (uint256 i = 0; i < nftIds.length; i = i.add(1)) {
            require(
                store.requester(vaultId, nftIds[i]) == msg.sender,
                "Not requester"
            );
            store.setRequester(vaultId, nftIds[i], address(0));
            store.nft(vaultId).safeTransferFrom(
                address(this),
                msg.sender,
                nftIds[i]
            );
        }
    }

    function approveMintRequest(uint256 vaultId, uint256[] memory nftIds)
        public
        virtual
    {
        onlyPrivileged(vaultId);
        for (uint256 i = 0; i < nftIds.length; i = i.add(1)) {
            address requester = store.requester(vaultId, nftIds[i]);
            require(requester != address(0), "No request");
            require(
                store.nft(vaultId).ownerOf(nftIds[i]) == address(this),
                "Not owner"
            );
            store.setRequester(vaultId, nftIds[i], address(0));
            store.setIsEligible(vaultId, nftIds[i], true);
            if (store.shouldReserve(vaultId, nftIds[i])) {
                store.reservesAdd(vaultId, nftIds[i]);
            } else {
                store.holdingsAdd(vaultId, nftIds[i]);
            }
            store.xToken(vaultId).mint(requester, 10**18);
        }
    }

    function _mint(uint256 vaultId, uint256[] memory nftIds, bool isDualOp)
        internal
        virtual
    {
        for (uint256 i = 0; i < nftIds.length; i = i.add(1)) {
            uint256 nftId = nftIds[i];
            require(isEligible(vaultId, nftId), "Not eligible");
            require(
                store.nft(vaultId).ownerOf(nftId) != address(this),
                "Already owner"
            );
            store.nft(vaultId).safeTransferFrom(
                msg.sender,
                address(this),
                nftId
            );
            require(
                store.nft(vaultId).ownerOf(nftId) == address(this),
                "Not received"
            );
            if (store.shouldReserve(vaultId, nftId)) {
                store.reservesAdd(vaultId, nftId);
            } else {
                store.holdingsAdd(vaultId, nftId);
            }
        }
        if (!isDualOp) {
            uint256 amount = nftIds.length.mul(10**18);
            store.xToken(vaultId).mint(msg.sender, amount);
        }
    }

    function _mintD2(uint256 vaultId, uint256 amount) internal virtual {
        store.d2Asset(vaultId).safeTransferFrom(
            msg.sender,
            address(this),
            amount
        );
        store.xToken(vaultId).mint(msg.sender, amount);
        store.setD2Holdings(vaultId, store.d2Holdings(vaultId).add(amount));
    }

    function _redeem(uint256 vaultId, uint256 numNFTs, bool isDualOp)
        internal
        virtual
    {
        for (uint256 i = 0; i < numNFTs; i = i.add(1)) {
            uint256[] memory nftIds = new uint256[](1);
            if (store.holdingsLength(vaultId) > 0) {
                uint256 rand = _getPseudoRand(store.holdingsLength(vaultId));
                nftIds[0] = store.holdingsAt(vaultId, rand);
            } else {
                uint256 rand = _getPseudoRand(store.reservesLength(vaultId));
                nftIds[0] = store.reservesAt(vaultId, rand);
            }
            _redeemHelper(vaultId, nftIds, isDualOp);
            emit Redeem(vaultId, nftIds, 0, msg.sender);
        }
    }

    function _redeemD2(uint256 vaultId, uint256 amount) internal virtual {
        store.xToken(vaultId).burnFrom(msg.sender, amount);
        store.d2Asset(vaultId).safeTransfer(msg.sender, amount);
        store.setD2Holdings(vaultId, store.d2Holdings(vaultId).sub(amount));
        uint256[] memory nftIds = new uint256[](0);
        emit Redeem(vaultId, nftIds, amount, msg.sender);
    }

    function _redeemHelper(
        uint256 vaultId,
        uint256[] memory nftIds,
        bool isDualOp
    ) internal virtual {
        if (!isDualOp) {
            store.xToken(vaultId).burnFrom(
                msg.sender,
                nftIds.length.mul(10**18)
            );
        }
        for (uint256 i = 0; i < nftIds.length; i = i.add(1)) {
            uint256 nftId = nftIds[i];
            require(
                store.holdingsContains(vaultId, nftId) ||
                    store.reservesContains(vaultId, nftId),
                "NFT not in vault"
            );
            if (store.holdingsContains(vaultId, nftId)) {
                store.holdingsRemove(vaultId, nftId);
            } else {
                store.reservesRemove(vaultId, nftId);
            }
            if (store.flipEligOnRedeem(vaultId)) {
                bool isElig = store.isEligible(vaultId, nftId);
                store.setIsEligible(vaultId, nftId, !isElig);
            }
            store.nft(vaultId).safeTransferFrom(
                address(this),
                msg.sender,
                nftId
            );
        }
    }

    function mint(uint256 vaultId, uint256[] memory nftIds, uint256 d2Amount)
        public
        payable
        virtual
        nonReentrant
    {
        onlyOwnerIfPaused(1);
        uint256 amount = store.isD2Vault(vaultId) ? d2Amount : nftIds.length;
        uint256 ethBounty = store.isD2Vault(vaultId)
            ? _calcBountyD2(vaultId, d2Amount, false)
            : _calcBounty(vaultId, amount, false);
        (uint256 ethBase, uint256 ethStep) = store.mintFees(vaultId);
        uint256 ethFee = _calcFee(
            amount,
            ethBase,
            ethStep,
            store.isD2Vault(vaultId)
        );
        if (ethFee > ethBounty) {
            _receiveEthToVault(vaultId, ethFee.sub(ethBounty), msg.value);
        }
        if (store.isD2Vault(vaultId)) {
            _mintD2(vaultId, d2Amount);
        } else {
            _mint(vaultId, nftIds, false);
        }
        if (ethBounty > ethFee) {
            _payEthFromVault(vaultId, ethBounty.sub(ethFee), msg.sender);
        }
        emit Mint(vaultId, nftIds, d2Amount, msg.sender);
    }

    function redeem(uint256 vaultId, uint256 amount)
        public
        payable
        virtual
        nonReentrant
    {
        onlyOwnerIfPaused(2);
        if (!store.isClosed(vaultId)) {
            uint256 ethBounty = store.isD2Vault(vaultId)
                ? _calcBountyD2(vaultId, amount, true)
                : _calcBounty(vaultId, amount, true);
            (uint256 ethBase, uint256 ethStep) = store.burnFees(vaultId);
            uint256 ethFee = _calcFee(
                amount,
                ethBase,
                ethStep,
                store.isD2Vault(vaultId)
            );
            if (ethBounty.add(ethFee) > 0) {
                _receiveEthToVault(vaultId, ethBounty.add(ethFee), msg.value);
            }
        }
        if (!store.isD2Vault(vaultId)) {
            _redeem(vaultId, amount, false);
        } else {
            _redeemD2(vaultId, amount);
        }

    }

    /* function mintAndRedeem(uint256 vaultId, uint256[] memory nftIds)
        public
        payable
        virtual
        nonReentrant
    {
        onlyOwnerIfPaused(3);
        require(!store.isD2Vault(vaultId), "Is D2 vault");
        require(!store.isClosed(vaultId), "Vault is closed");
        (uint256 ethBase, uint256 ethStep) = store.dualFees(vaultId);
        uint256 ethFee = _calcFee(
            nftIds.length,
            ethBase,
            ethStep,
            store.isD2Vault(vaultId)
        );
        if (ethFee > 0) {
            _receiveEthToVault(vaultId, ethFee, msg.value);
        }
        _mint(vaultId, nftIds, true);
        _redeem(vaultId, nftIds.length, true);
    } */

    function setIsEligible(
        uint256 vaultId,
        uint256[] memory nftIds,
        bool _boolean
    ) public virtual {
        onlyPrivileged(vaultId);
        for (uint256 i = 0; i < nftIds.length; i = i.add(1)) {
            store.setIsEligible(vaultId, nftIds[i], _boolean);
        }
    }

    function setAllowMintRequests(uint256 vaultId, bool isAllowed)
        public
        virtual
    {
        onlyPrivileged(vaultId);
        store.setAllowMintRequests(vaultId, isAllowed);
    }

    function setFlipEligOnRedeem(uint256 vaultId, bool flipElig)
        public
        virtual
    {
        onlyPrivileged(vaultId);
        store.setFlipEligOnRedeem(vaultId, flipElig);
    }

    function setNegateEligibility(uint256 vaultId, bool shouldNegate)
        public
        virtual
    {
        onlyPrivileged(vaultId);
        require(
            store
                .holdingsLength(vaultId)
                .add(store.reservesLength(vaultId))
                .add(store.d2Holdings(vaultId)) ==
                0,
            "Vault not empty"
        );
        store.setNegateEligibility(vaultId, shouldNegate);
    }

    /* function setShouldReserve(
        uint256 vaultId,
        uint256[] memory nftIds,
        bool _boolean
    ) public virtual {
        onlyPrivileged(vaultId);
        for (uint256 i = 0; i < nftIds.length; i.add(1)) {
            store.setShouldReserve(vaultId, nftIds[i], _boolean);
        }
    } */

    /* function setIsReserved(
        uint256 vaultId,
        uint256[] memory nftIds,
        bool _boolean
    ) public virtual {
        onlyPrivileged(vaultId);
        for (uint256 i = 0; i < nftIds.length; i.add(1)) {
            uint256 nftId = nftIds[i];
            if (_boolean) {
                require(
                    store.holdingsContains(vaultId, nftId),
                    "Invalid nftId"
                );
                store.holdingsRemove(vaultId, nftId);
                store.reservesAdd(vaultId, nftId);
            } else {
                require(
                    store.reservesContains(vaultId, nftId),
                    "Invalid nftId"
                );
                store.reservesRemove(vaultId, nftId);
                store.holdingsAdd(vaultId, nftId);
            }
        }
    } */

    function changeTokenName(uint256 vaultId, string memory newName)
        public
        virtual
    {
        onlyPrivileged(vaultId);
        store.xToken(vaultId).changeName(newName);
    }

    function changeTokenSymbol(uint256 vaultId, string memory newSymbol)
        public
        virtual
    {
        onlyPrivileged(vaultId);
        store.xToken(vaultId).changeSymbol(newSymbol);
    }

    function setManager(uint256 vaultId, address newManager) public virtual {
        onlyPrivileged(vaultId);
        store.setManager(vaultId, newManager);
    }

    function finalizeVault(uint256 vaultId) public virtual {
        onlyPrivileged(vaultId);
        if (!store.isFinalized(vaultId)) {
            store.setIsFinalized(vaultId, true);
        }
    }

    function closeVault(uint256 vaultId) public virtual {
        onlyPrivileged(vaultId);
        if (!store.isFinalized(vaultId)) {
            store.setIsFinalized(vaultId, true);
        }
        store.setIsClosed(vaultId, true);
    }

    function setMintFees(uint256 vaultId, uint256 _ethBase, uint256 _ethStep)
        public
        virtual
    {
        onlyPrivileged(vaultId);
        store.setMintFees(vaultId, _ethBase, _ethStep);
    }

    function setBurnFees(uint256 vaultId, uint256 _ethBase, uint256 _ethStep)
        public
        virtual
    {
        onlyPrivileged(vaultId);
        store.setBurnFees(vaultId, _ethBase, _ethStep);
    }

    /* function setDualFees(uint256 vaultId, uint256 _ethBase, uint256 _ethStep)
        public
        virtual
    {
        onlyPrivileged(vaultId);
        store.setDualFees(vaultId, _ethBase, _ethStep);
    } */

    function setSupplierBounty(uint256 vaultId, uint256 ethMax, uint256 length)
        public
        virtual
    {
        onlyPrivileged(vaultId);
        store.setSupplierBounty(vaultId, ethMax, length);
    }

}

File 30 of 46: NFTXv2.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./NFTX.sol";

contract NFTXv2 is NFTX {
    /* function transferERC721(uint256 vaultId, uint256 tokenId, address to)
        public
        virtual
        onlyOwner
    {
        store.nft(vaultId).transferFrom(address(this), to, tokenId);
    }

    function createVault(
        address _xTokenAddress,
        address _assetAddress,
        bool _isD2Vault
    ) public virtual override nonReentrant returns (uint256) {
        if (_xTokenAddress != _assetAddress && _isD2Vault) {
            return 0;
        }
        return 0;
    } */

    function _mint(uint256 vaultId, uint256[] memory nftIds, bool isDualOp)
        internal
        virtual
        override
    {
        for (uint256 i = 0; i < nftIds.length; i = i.add(1)) {
            uint256 nftId = nftIds[i];
            require(isEligible(vaultId, nftId), "Not eligible");
            require(
                store.nft(vaultId).ownerOf(nftId) != address(this),
                "Already owner"
            );
            store.nft(vaultId).transferFrom(msg.sender, address(this), nftId);
            require(
                store.nft(vaultId).ownerOf(nftId) == address(this),
                "Not received"
            );
            if (store.shouldReserve(vaultId, nftId)) {
                store.reservesAdd(vaultId, nftId);
            } else {
                store.holdingsAdd(vaultId, nftId);
            }
        }
        if (!isDualOp) {
            uint256 amount = nftIds.length.mul(10**18);
            store.xToken(vaultId).mint(msg.sender, amount);
        }
    }
}

File 31 of 46: NFTXv3.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./NFTXv2.sol";

contract NFTXv3 is NFTXv2 {
    function requestMint(uint256 vaultId, uint256[] memory nftIds)
        public
        payable
        virtual
        override
        nonReentrant
    {
        onlyOwnerIfPaused(1);
        require(store.allowMintRequests(vaultId), "Not allowed");
        // TODO: implement bounty + fees
        for (uint256 i = 0; i < nftIds.length; i = i.add(1)) {
            require(
                store.nft(vaultId).ownerOf(nftIds[i]) != address(this),
                "Already owner"
            );
            store.nft(vaultId).transferFrom(
                msg.sender,
                address(this),
                nftIds[i]
            );
            require(
                store.nft(vaultId).ownerOf(nftIds[i]) == address(this),
                "Not received"
            );
            store.setRequester(vaultId, nftIds[i], msg.sender);
        }
        emit MintRequested(vaultId, nftIds, msg.sender);
    }
}

File 32 of 46: Ownable.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./Context.sol";
import "./Initializable.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Context, Initializable {
    address private _owner;

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function initOwnable() internal virtual initializer {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(
            newOwner != address(0),
            "Ownable: new owner is the zero address"
        );
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

File 33 of 46: Pausable.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./Ownable.sol";
import "./SafeMath.sol";

contract Pausable is Ownable {
    mapping(uint256 => bool) isPaused;
    // 0 : createVault
    // 1 : mint
    // 2 : redeem
    // 3 : mintAndRedeem

    function onlyOwnerIfPaused(uint256 pauserId) public view virtual {
        require(!isPaused[pauserId] || msg.sender == owner(), "Paused");
    }

    function setPaused(uint256 pauserId, bool _isPaused)
        public
        virtual
        onlyOwner
    {
        isPaused[pauserId] = _isPaused;
    }
}

File 34 of 46: ProxyController.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./Ownable.sol";
import "./SafeMath.sol";
import "./ITransparentUpgradeableProxy.sol";

contract ProxyController is Ownable {
    using SafeMath for uint256;

    ITransparentUpgradeableProxy private nftxProxy;
    address public implAddress;

    constructor(address nftx) public {
        initOwnable();
        nftxProxy = ITransparentUpgradeableProxy(nftx);
    }

    function getAdmin() public returns (address) {
        return nftxProxy.admin();
    }

    function fetchImplAddress() public {
        implAddress = nftxProxy.implementation();
    }

    function changeProxyAdmin(address newAdmin) public onlyOwner {
        nftxProxy.changeAdmin(newAdmin);
    }

    function upgradeProxyTo(address newImpl) public onlyOwner {
        nftxProxy.upgradeTo(newImpl);
    }
}

File 35 of 46: ReentrancyGuard.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./Initializable.sol";

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
contract ReentrancyGuard is Initializable {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the revault on every call to nonReentrant will be lower in
    // amount. Since revaults are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full revault coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    function initReentrancyGuard() internal {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a revault is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

File 36 of 46: SafeERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./IERC20.sol";
import "./SafeMath.sol";
import "./Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(token.transfer.selector, to, value)
        );
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)
        );
    }

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

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value)
        internal
    {
        uint256 newAllowance = token.allowance(address(this), spender).add(
            value
        );
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(
                token.approve.selector,
                spender,
                newAllowance
            )
        );
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value)
        internal
    {
        uint256 newAllowance = token.allowance(address(this), spender).sub(
            value,
            "SafeERC20: decreased allowance below zero"
        );
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(
                token.approve.selector,
                spender,
                newAllowance
            )
        );
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

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

File 37 of 46: SafeMath.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

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

        return c;
    }

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

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

        return c;
    }

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

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

        return c;
    }

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

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

        return c;
    }

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

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

File 38 of 46: Strings.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev String operations.
 */
library Strings {
    /**
     * @dev Converts a `uint256` to its ASCII `string` 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);
        uint256 index = digits - 1;
        temp = value;
        while (temp != 0) {
            buffer[index--] = byte(uint8(48 + temp % 10));
            temp /= 10;
        }
        return string(buffer);
    }
}

File 39 of 46: TimeDelay.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./Ownable.sol";
import "./SafeMath.sol";

contract TimeDelay is Ownable {
    using SafeMath for uint256;

    uint256 public shortDelay;
    uint256 public mediumDelay;
    uint256 public longDelay;

    function setDelays(
        uint256 _shortDelay,
        uint256 _mediumDelay,
        uint256 _longDelay
    ) internal virtual {
        shortDelay = _shortDelay;
        mediumDelay = _mediumDelay;
        longDelay = _longDelay;
    }

    function timeInDays(uint256 num) internal pure returns (uint256) {
        return num * 60 * 60 * 24;
    }

    function getDelay(uint256 delayIndex) public view returns (uint256) {
        if (delayIndex == 0) {
            return shortDelay;
        } else if (delayIndex == 1) {
            return mediumDelay;
        } else if (delayIndex == 2) {
            return longDelay;
        }
    }

    function onlyIfPastDelay(uint256 delayIndex, uint256 startTime)
        internal
        view
    {
        require(1 >= startTime.add(getDelay(delayIndex)), "Delay not over");
    }
}

File 40 of 46: Timelocked.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./Ownable.sol";
import "./SafeMath.sol";

contract Timelocked is Ownable {
    using SafeMath for uint256;

    uint256 public shortDelay;
    uint256 public mediumDelay;
    uint256 public longDelay;

    function setDelays(
        uint256 _shortDelay,
        uint256 _mediumDelay,
        uint256 _longDelay
    ) internal virtual {
        shortDelay = _shortDelay;
        mediumDelay = _mediumDelay;
        longDelay = _longDelay;
    }

    function timeInDays(uint256 num) internal pure returns (uint256) {
        return num * 60 * 60 * 24;
    }

    function getDelay(uint256 delayIndex) public view returns (uint256) {
        if (delayIndex == 0) {
            return shortDelay;
        } else if (delayIndex == 1) {
            return mediumDelay;
        } else if (delayIndex == 2) {
            return longDelay;
        }
    }

    function onlyIfPastDelay(uint256 delayIndex, uint256 startTime)
        internal
        view
    {
        require(1 >= startTime.add(getDelay(delayIndex)), "Delay not over");
    }
}

File 41 of 46: TokenAppController.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./Ownable.sol";
import "./ITokenManager.sol";

contract TokenAppController is Ownable {
    ITokenManager public tokenManager;
    address public tokenManagerAddr;

    function initTAC() internal {
        initOwnable();
    }

    function setTokenManager(address tokenManagerAddress) internal onlyOwner {
        tokenManagerAddr = tokenManagerAddress;
        tokenManager = ITokenManager(tokenManagerAddr);
    }

    function callMint(address _receiver, uint256 _amount) internal onlyOwner {
        tokenManager.mint(_receiver, _amount);
    }

    function callIssue(uint256 _amount) internal onlyOwner {
        tokenManager.issue(_amount);
    }

    function callAssign(address _receiver, uint256 _amount) internal onlyOwner {
        tokenManager.assign(_receiver, _amount);
    }

    function callBurn(address _holder, uint256 _amount) internal onlyOwner {
        tokenManager.burn(_holder, _amount);
    }

    function callAssignVested(
        address _receiver,
        uint256 _amount,
        uint64 _start,
        uint64 _cliff,
        uint64 _vested,
        bool _revokable
    ) internal returns (uint256) {
        return
            tokenManager.assignVested(
                _receiver,
                _amount,
                _start,
                _cliff,
                _vested,
                _revokable
            );
    }

    function callRevokeVesting(address _holder, uint256 _vestingId)
        internal
        onlyOwner
    {
        tokenManager.revokeVesting(_holder, _vestingId);
    }

}

File 42 of 46: UpgradeController.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./ITransparentUpgradeableProxy.sol";
import "./ControllerBase.sol";

contract UpgradeController is ControllerBase {
    using SafeMath for uint256;

    
    ITransparentUpgradeableProxy private nftxProxy;
    ITransparentUpgradeableProxy private xControllerProxy;

    constructor(address nftx, address xController) public {
        ControllerBase.initialize();
        nftxProxy = ITransparentUpgradeableProxy(nftx);
        xControllerProxy = ITransparentUpgradeableProxy(xController);
    }

    function executeFuncCall(uint256 fcId) public override onlyOwner {
        super.executeFuncCall(fcId);
        if (funcIndex[fcId] == 3) {
            nftxProxy.changeAdmin(addressParam[fcId]);
        } else if (funcIndex[fcId] == 4) {
            nftxProxy.upgradeTo(addressParam[fcId]);
        } else if (funcIndex[fcId] == 5) {
            xControllerProxy.changeAdmin(addressParam[fcId]);
        } else if (funcIndex[fcId] == 6) {
            xControllerProxy.upgradeTo(addressParam[fcId]);
        }
    }

}

File 43 of 46: XBouties.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./TokenAppController.sol";
import "./IERC20.sol";
import "./IERC721.sol";
import "./IXStore.sol";
import "./SafeMath.sol";
import "./SafeERC20.sol";
import "./ReentrancyGuard.sol";

contract XBounties is TokenAppController, ReentrancyGuard {
    using SafeMath for uint256;

    using SafeERC20 for IERC20;

    uint256 public constant BASE = 10**18;
    uint256 public interval = 15 * 60; // 15 minutes
    uint256 public start = 1608580800; // Mon, Dec 21 2020, 12pm PST
    uint64 public vestedUntil = 1609876800; // Tue, Jan 5 2021, 12pm PST

    IERC20 public nftxToken;
    address payable public daoMultiSig;

    struct Bounty {
        address tokenContract;
        uint256 nftxPrice;
        uint256 paidOut;
        uint256 payoutCap;
    }

    event NewBountyAdded(uint256 bountyId);
    event BountyFilled(
        uint256 bountyId,
        uint256 nftxAmount,
        uint256 assetAmount,
        address sender,
        uint64 start,
        uint64 cliff,
        uint64 vested
    );
    event NftxPriceSet(uint256 bountyId, uint256 newNftxPrice);
    event PayoutCapSet(uint256 bountyId, uint256 newCap);
    event BountyClosed(uint256 bountyId);
    event EthWithdrawn(uint256 amount);
    event Erc20Withdrawn(address tokenContract, uint256 amount);
    event Erc721Withdrawn(address nftContract, uint256 tokenId);

    Bounty[] internal bounties;

    constructor(
        address _tokenManager,
        address payable _daoMultiSig,
        address _nftxToken,
        address _xStore
    ) public {
        initTAC();
        setTokenManager(_tokenManager);
        daoMultiSig = _daoMultiSig;
        nftxToken = IERC20(_nftxToken);

        IXStore xStore = IXStore(_xStore);

        createEthBounty(130 * BASE, 65000 * BASE);
        createEthBounty(65 * BASE, 65000 * BASE);
        createEthBounty(BASE.mul(130).div(3), 65000 * BASE);
        createBounty(
            xStore.xTokenAddress(0), // PUNK-BASIC
            390 * BASE,
            31200 * BASE
        );
        createBounty(
            xStore.xTokenAddress(1), // PUNK-ATTR-4
            585 * BASE,
            14625 * BASE
        );
        createBounty(
            xStore.xTokenAddress(2), // PUNK-ATTR-5
            1950 * BASE,
            15600 * BASE
        );
        createBounty(
            xStore.xTokenAddress(3), // PUNK-ZOMBIE
            8450 * BASE,
            16900 * BASE
        );
        createBounty(
            xStore.xTokenAddress(4), // AXIE-ORIGIN
            130 * BASE,
            7800 * BASE
        );
        createBounty(
            xStore.xTokenAddress(5), // AXIE-MYSTIC-1
            780 * BASE,
            7800 * BASE
        );
        createBounty(
            xStore.xTokenAddress(6), // AXIE-MYSTIC-2
            3900 * BASE,
            7800 * BASE
        );
        createBounty(
            xStore.xTokenAddress(7), // KITTY-GEN-0
            26 * BASE,
            5850 * BASE
        );
        createBounty(
            xStore.xTokenAddress(8), // KITTY-GEN-0-F
            39 * BASE,
            5850 * BASE
        );
        createBounty(
            xStore.xTokenAddress(9), // KITTY-FOUNDER
            6175 * BASE,
            6175 * BASE
        );
        createBounty(
            xStore.xTokenAddress(10), // AVASTR-BASIC
            20 * BASE,
            6175 * BASE
        );
        createBounty(
            xStore.xTokenAddress(11), // AVASTR-RANK-30
            26 * BASE,
            6175 * BASE
        );
        createBounty(
            xStore.xTokenAddress(12), // AVASTR-RANK-60
            195 * BASE,
            6175 * BASE
        );
        createBounty(
            xStore.xTokenAddress(13), // GLYPH
            1300 * BASE,
            26000 * BASE
        );
        createBounty(
            xStore.xTokenAddress(14), // JOY
            455 * BASE,
            10010 * BASE
        );
    }

    function setStart(uint256 newStart) public onlyOwner {
        start = newStart;
    }

    function setInterval(uint256 newInterval) public onlyOwner {
        interval = newInterval;
    }

    function setVestedUntil(uint64 newTime) public onlyOwner {
        vestedUntil = newTime;
    }

    function getBountyInfo(uint256 bountyId)
        public
        view
        returns (address, uint256, uint256, uint256)
    {
        require(bountyId < bounties.length, "Invalid bountyId");
        return (
            bounties[bountyId].tokenContract,
            bounties[bountyId].nftxPrice,
            bounties[bountyId].paidOut,
            bounties[bountyId].payoutCap
        );
    }

    function getMaxPayout() public view returns (uint256) {
        uint256 tMinus4 = start.sub(interval.mul(4));
        uint256 tMinus3 = start.sub(interval.mul(3));
        uint256 tMinus2 = start.sub(interval.mul(2));
        uint256 tMinus1 = start.sub(interval.mul(1));
        uint256 tm4Max = 0;
        uint256 tm3Max = 50 * BASE;
        uint256 tm2Max = 500 * BASE;
        uint256 tm1Max = 5000 * BASE;
        uint256 tm0Max = 50000 * BASE;
        if (now < tMinus4) {
            return 0;
        } else if (now < tMinus3) {
            uint256 progressBigNum = now.sub(tMinus4).mul(BASE).div(interval);
            uint256 addedPayout = tm3Max.sub(tm4Max).mul(progressBigNum).div(
                BASE
            );
            return tm4Max.add(addedPayout);
        } else if (now < tMinus2) {
            uint256 progressBigNum = now.sub(tMinus3).mul(BASE).div(interval);
            uint256 addedPayout = tm2Max.sub(tm3Max).mul(progressBigNum).div(
                BASE
            );
            return tm3Max.add(addedPayout);
        } else if (now < tMinus1) {
            uint256 progressBigNum = now.sub(tMinus2).mul(BASE).div(interval);
            uint256 addedPayout = tm1Max.sub(tm2Max).mul(progressBigNum).div(
                BASE
            );
            return tm2Max.add(addedPayout);
        } else if (now < start) {
            uint256 progressBigNum = now.sub(tMinus1).mul(BASE).div(interval);
            uint256 addedPayout = tm0Max.sub(tm1Max).mul(progressBigNum).div(
                BASE
            );
            return tm1Max.add(addedPayout);
        } else {
            return tm0Max;
        }
    }

    function getBountiesLength() public view returns (uint256) {
        return bounties.length;
    }

    function getIsEth(uint256 bountyId) public view returns (bool) {
        require(bountyId < bounties.length, "Invalid bountyId");
        return bounties[bountyId].tokenContract == address(0);
    }

    function getTokenContract(uint256 bountyId) public view returns (address) {
        require(bountyId < bounties.length, "Invalid bountyId");
        return bounties[bountyId].tokenContract;
    }

    function getNftxPrice(uint256 bountyId) public view returns (uint256) {
        require(bountyId < bounties.length, "Invalid bountyId");
        return bounties[bountyId].nftxPrice;
    }

    function getPayoutCap(uint256 bountyId) public view returns (uint256) {
        require(bountyId < bounties.length, "Invalid bountyId");
        return bounties[bountyId].payoutCap;
    }

    function getPaidOut(uint256 bountyId) public view returns (uint256) {
        require(bountyId < bounties.length, "Invalid bountyId");
        return bounties[bountyId].paidOut;
    }

    function setNftxPrice(uint256 bountyId, uint256 newPrice) public onlyOwner {
        require(bountyId < bounties.length, "Invalid bountyId");
        bounties[bountyId].nftxPrice = newPrice;
        emit NftxPriceSet(bountyId, newPrice);
    }

    function setPayoutCap(uint256 bountyId, uint256 newCap) public onlyOwner {
        require(bountyId < bounties.length, "Invalid bountyId");
        bounties[bountyId].payoutCap = newCap;
        emit PayoutCapSet(bountyId, newCap);
    }

    function createEthBounty(uint256 nftxPricePerEth, uint256 amountOfEth)
        public
        onlyOwner
    {
        createBounty(address(0), nftxPricePerEth, amountOfEth);
    }

    function createBounty(address token, uint256 nftxPrice, uint256 payoutCap)
        public
        onlyOwner
    {
        Bounty memory newBounty;
        newBounty.tokenContract = token;
        newBounty.nftxPrice = nftxPrice;
        newBounty.payoutCap = payoutCap;
        bounties.push(newBounty);
        uint256 bountyId = bounties.length.sub(1);
        emit NewBountyAdded(bountyId);
    }

    function closeBounty(uint256 bountyId) public onlyOwner {
        require(bountyId < bounties.length, "Invalid bountyId");
        bounties[bountyId].payoutCap = bounties[bountyId].paidOut;
        emit BountyClosed(bountyId);
    }

    function fillBounty(uint256 bountyId, uint256 amountBeingSent)
        public
        payable
        nonReentrant
    {
        _fillBountyCustom(
            bountyId,
            amountBeingSent,
            vestedUntil - 2,
            vestedUntil - 1,
            vestedUntil
        );
    }

    /* function fillBountyCustom(
        uint256 bountyId,
        uint256 donationSize,
        uint64 _start,
        uint64 cliff,
        uint64 vested
    ) public payable nonReentrant {
        _fillBountyCustom(bountyId, donationSize, _start, cliff, vested);
    } */

    function _fillBountyCustom(
        uint256 bountyId,
        uint256 donationSize,
        uint64 _start,
        uint64 cliff,
        uint64 vested
    ) internal {
        require(cliff >= vestedUntil - 1 && vested >= vestedUntil, "Not valid");
        require(bountyId < bounties.length, "Invalid bountyId");
        Bounty storage bounty = bounties[bountyId];
        uint256 rewardCap = getMaxPayout();
        require(rewardCap > 0, "Must wait for cap to be lifted");
        uint256 remainingNftx = bounty.payoutCap.sub(bounty.paidOut);
        require(remainingNftx > 0, "Bounty is already finished");
        uint256 requestedNftx = donationSize.mul(bounty.nftxPrice).div(BASE);
        uint256 willGive = remainingNftx < requestedNftx
            ? remainingNftx
            : rewardCap < requestedNftx
            ? rewardCap
            : requestedNftx;
        uint256 willTake = donationSize.mul(willGive).div(requestedNftx);
        if (getIsEth(bountyId)) {
            require(msg.value >= willTake, "Value sent is insufficient");
            if (msg.value > willTake) {
                address payable _sender = msg.sender;
                _sender.transfer(msg.value.sub(willTake));
            }
            daoMultiSig.transfer(willTake);
        } else {
            IERC20 fundToken = IERC20(bounty.tokenContract);
            fundToken.safeTransferFrom(msg.sender, daoMultiSig, willTake);
        }
        if (now > vested) {
            nftxToken.safeTransfer(msg.sender, willGive);
        } else {
            nftxToken.safeTransfer(tokenManagerAddr, willGive);
            callAssignVested(
                msg.sender,
                willGive,
                _start,
                cliff,
                vested,
                false
            );
        }
        bounty.paidOut = bounty.paidOut.add(willGive);
        emit BountyFilled(
            bountyId,
            willGive,
            willTake,
            msg.sender,
            _start,
            cliff,
            vested
        );
    }

    function withdrawEth(uint256 amount) public onlyOwner {
        address payable sender = msg.sender;
        sender.transfer(amount);
        emit EthWithdrawn(amount);
    }

    function withdrawErc20(address tokenContract, uint256 amount)
        public
        onlyOwner
    {
        IERC20 token = IERC20(tokenContract);
        token.safeTransfer(msg.sender, amount);
        emit Erc20Withdrawn(tokenContract, amount);
    }

    function withdrawErc721(address nftContract, uint256 tokenId)
        public
        onlyOwner
    {
        IERC721 nft = IERC721(nftContract);
        nft.safeTransferFrom(address(this), msg.sender, tokenId);
        emit Erc721Withdrawn(nftContract, tokenId);
    }
}

File 44 of 46: XController.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./ControllerBase.sol";
import "./INFTX.sol";
import "./IXStore.sol";
import "./Initializable.sol";

contract XController is ControllerBase {
    INFTX private nftx;
    IXStore store;

    /* uint256 numFuncCalls;

    mapping(uint256 => uint256) public time;
    mapping(uint256 => uint256) public funcIndex;
    mapping(uint256 => address payable) public addressParam;
    mapping(uint256 => uint256[]) public uintArrayParam; */
    mapping(uint256 => uint256) public uintParam;
    mapping(uint256 => string) public stringParam;
    mapping(uint256 => bool) public boolParam;

    mapping(uint256 => uint256) public pendingEligAdditions;

    function initXController(address nftxAddress) public initializer {
        initOwnable();
        nftx = INFTX(nftxAddress);
    }

    function onlyOwnerOrLeadDev(uint256 funcIndex) public view virtual {
        if (funcIndex > 3) {
            require(
                _msgSender() == leadDev || _msgSender() == owner(),
                "Not owner or leadDev"
            );
        } else {
            require(_msgSender() == owner(), "Not owner");
        }
    }

    function stageFuncCall(
        uint256 _funcIndex,
        address payable _addressParam,
        uint256 _uintParam,
        string memory _stringParam,
        uint256[] memory _uintArrayParam,
        bool _boolParam
    ) public virtual {
        onlyOwnerOrLeadDev(_funcIndex);
        uint256 fcId = numFuncCalls;
        numFuncCalls = numFuncCalls.add(1);
        time[fcId] = 1;
        funcIndex[fcId] = _funcIndex;
        addressParam[fcId] = _addressParam;
        uintParam[fcId] = _uintParam;
        stringParam[fcId] = _stringParam;
        uintArrayParam[fcId] = _uintArrayParam;
        boolParam[fcId] = _boolParam;
        if (
            funcIndex[fcId] == 4 &&
            store.negateEligibility(uintParam[fcId]) != !boolParam[fcId]
        ) {
            pendingEligAdditions[uintParam[fcId]] = pendingEligAdditions[uintParam[fcId]]
                .add(uintArrayParam[fcId].length);
        }
    }

    function cancelFuncCall(uint256 fcId) public override virtual {
        onlyOwnerOrLeadDev(funcIndex[fcId]);
        require(funcIndex[fcId] != 0, "Already cancelled");
        funcIndex[fcId] = 0;
        if (
            funcIndex[fcId] == 3 &&
            store.negateEligibility(uintParam[fcId]) != !boolParam[fcId]
        ) {
            pendingEligAdditions[uintParam[fcId]] = pendingEligAdditions[uintParam[fcId]]
                .sub(uintArrayParam[fcId].length);
        }
    }

    function executeFuncCall(uint256 fcId) public override virtual {
        super.executeFuncCall(fcId);
        if (funcIndex[fcId] == 3) {
            onlyIfPastDelay(2, time[fcId]);
            nftx.transferOwnership(addressParam[fcId]);
        } else if (funcIndex[fcId] == 4) {
            uint256 percentInc = pendingEligAdditions[uintParam[fcId]]
                .mul(100)
                .div(nftx.vaultSize(uintParam[fcId]));
            if (percentInc > 10) {
                onlyIfPastDelay(2, time[fcId]);
            } else if (percentInc > 1) {
                onlyIfPastDelay(1, time[fcId]);
            } else {
                onlyIfPastDelay(0, time[fcId]);
            }
            nftx.setIsEligible(
                uintParam[fcId],
                uintArrayParam[fcId],
                boolParam[fcId]
            );
            pendingEligAdditions[uintParam[fcId]] = pendingEligAdditions[uintParam[fcId]]
                .sub(uintArrayParam[fcId].length);
        } else if (funcIndex[fcId] == 5) {
            onlyIfPastDelay(0, time[fcId]); // vault must be empty
            nftx.setNegateEligibility(funcIndex[fcId], boolParam[fcId]);
        } else if (funcIndex[fcId] == 6) {
            onlyIfPastDelay(0, time[fcId]);
            nftx.setShouldReserve(
                uintParam[fcId],
                uintArrayParam[fcId],
                boolParam[fcId]
            );
        } else if (funcIndex[fcId] == 7) {
            onlyIfPastDelay(0, time[fcId]);
            nftx.setIsReserved(
                uintParam[fcId],
                uintArrayParam[fcId],
                boolParam[fcId]
            );
        } else if (funcIndex[fcId] == 8) {
            onlyIfPastDelay(1, time[fcId]);
            nftx.changeTokenName(uintParam[fcId], stringParam[fcId]);
        } else if (funcIndex[fcId] == 9) {
            onlyIfPastDelay(1, time[fcId]);
            nftx.changeTokenSymbol(uintParam[fcId], stringParam[fcId]);
        } else if (funcIndex[fcId] == 10) {
            onlyIfPastDelay(0, time[fcId]);
            nftx.closeVault(uintParam[fcId]);
        } else if (funcIndex[fcId] == 11) {
            onlyIfPastDelay(0, time[fcId]);
            nftx.setMintFees(
                uintArrayParam[fcId][0],
                uintArrayParam[fcId][1],
                uintArrayParam[fcId][2]
            );
        } else if (funcIndex[fcId] == 12) {
            (uint256 ethBase, uint256 ethStep) = store.burnFees(
                uintArrayParam[fcId][0]
            );
            uint256 ethBasePercentInc = uintArrayParam[fcId][1].mul(100).div(
                ethBase
            );
            uint256 ethStepPercentInc = uintArrayParam[fcId][2].mul(100).div(
                ethStep
            );
            if (ethBasePercentInc.add(ethStepPercentInc) > 15) {
                onlyIfPastDelay(2, time[fcId]);
            } else if (ethBasePercentInc.add(ethStepPercentInc) > 5) {
                onlyIfPastDelay(1, time[fcId]);
            } else {
                onlyIfPastDelay(0, time[fcId]);
            }
            nftx.setBurnFees(
                uintArrayParam[fcId][0],
                uintArrayParam[fcId][1],
                uintArrayParam[fcId][2]
            );
        } else if (funcIndex[fcId] == 13) {
            onlyIfPastDelay(0, time[fcId]);
            nftx.setDualFees(
                uintArrayParam[fcId][0],
                uintArrayParam[fcId][1],
                uintArrayParam[fcId][2]
            );
        } else if (funcIndex[fcId] == 14) {
            (uint256 ethMax, uint256 length) = store.supplierBounty(
                uintArrayParam[fcId][0]
            );
            uint256 ethMaxPercentInc = uintArrayParam[fcId][1].mul(100).div(
                ethMax
            );
            uint256 lengthPercentInc = uintArrayParam[fcId][2].mul(100).div(
                length
            );
            if (ethMaxPercentInc.add(lengthPercentInc) > 20) {
                onlyIfPastDelay(2, time[fcId]);
            } else if (ethMaxPercentInc.add(lengthPercentInc) > 5) {
                onlyIfPastDelay(1, time[fcId]);
            } else {
                onlyIfPastDelay(0, time[fcId]);
            }
            nftx.setSupplierBounty(
                uintArrayParam[fcId][0],
                uintArrayParam[fcId][1],
                uintArrayParam[fcId][2]
            );
        }
    }

}

File 45 of 46: XSale.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./SafeMath.sol";
import "./Pausable.sol";
import "./INFTX.sol";
import "./IXStore.sol";
import "./IERC721.sol";
import "./ITokenManager.sol";
import "./Context.sol";
import "./ReentrancyGuard.sol";

contract XSale is Pausable, ReentrancyGuard {
    using SafeMath for uint256;
    using EnumerableSet for EnumerableSet.UintSet;

    INFTX public nftx;
    IXStore public xStore;
    IERC20 public nftxToken;
    ITokenManager public tokenManager;

    uint64 public constant vestedUntil = 1610697600000; // Fri Jan 15 2021 00:00:00 GMT-0800

    // Bounty[] public ethBounties;
    mapping(uint256 => Bounty[]) public xBounties;

    struct Bounty {
        uint256 reward;
        uint256 request;
    }

    constructor(address _nftx, address _nftxToken, address _tokenManager)
        public
    {
        initOwnable();
        nftx = INFTX(_nftx);
        xStore = IXStore(nftx.store());
        nftxToken = IERC20(_nftxToken);
        tokenManager = ITokenManager(_tokenManager);
    }

    function addXBounty(uint256 vaultId, uint256 reward, uint256 request)
        public
        onlyOwner
    {
        Bounty memory newXBounty;
        newXBounty.reward = reward;
        newXBounty.request = request;
        xBounties[vaultId].push(newXBounty);
    }

    function setXBounty(
        uint256 vaultId,
        uint256 xBountyIndex,
        uint256 newReward,
        uint256 newRequest
    ) public onlyOwner {
        Bounty storage xBounty = xBounties[vaultId][xBountyIndex];
        xBounty.reward = newReward;
        xBounty.request = newRequest;
    }

    function withdrawNFTX(address to, uint256 amount) public onlyOwner {
        nftxToken.transfer(to, amount);
    }

    function withdrawXToken(uint256 vaultId, address to, uint256 amount)
        public
        onlyOwner
    {
        xStore.xToken(vaultId).transfer(to, amount);
    }

    function withdrawETH(address payable to, uint256 amount) public onlyOwner {
        to.transfer(amount);
    }

    function fillXBounty(uint256 vaultId, uint256 xBountyIndex, uint256 amount)
        public
        nonReentrant
    {
        Bounty storage xBounty = xBounties[vaultId][xBountyIndex];
        require(amount <= xBounty.request, "Amount > bounty");
        require(
            amount <= nftxToken.balanceOf(address(nftx)),
            "Amount > balance"
        );
        xStore.xToken(vaultId).transferFrom(
            _msgSender(),
            address(nftx),
            amount
        );
        uint256 reward = xBounty.reward.mul(amount).div(xBounty.request);
        xBounty.request = xBounty.request.sub(amount);
        xBounty.reward = xBounty.reward.sub(reward);
        nftxToken.transfer(address(tokenManager), reward);
        tokenManager.assignVested(
            _msgSender(),
            reward,
            vestedUntil,
            vestedUntil,
            vestedUntil,
            false
        );
    }
}

File 46 of 46: XStore.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.8;

import "./EnumerableSet.sol";
import "./Ownable.sol";
import "./SafeMath.sol";
import "./IXToken.sol";
import "./IERC721.sol";
import "./SafeERC20.sol";

contract XStore is Ownable {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;
    using EnumerableSet for EnumerableSet.UintSet;

    struct FeeParams {
        uint256 ethBase;
        uint256 ethStep;
    }

    struct BountyParams {
        uint256 ethMax;
        uint256 length;
    }

    struct Vault {
        address xTokenAddress;
        address nftAddress;
        address manager;
        IXToken xToken;
        IERC721 nft;
        EnumerableSet.UintSet holdings;
        EnumerableSet.UintSet reserves;
        mapping(uint256 => address) requester;
        mapping(uint256 => bool) isEligible;
        mapping(uint256 => bool) shouldReserve;
        bool allowMintRequests;
        bool flipEligOnRedeem;
        bool negateEligibility;
        bool isFinalized;
        bool isClosed;
        FeeParams mintFees;
        FeeParams burnFees;
        FeeParams dualFees;
        BountyParams supplierBounty;
        uint256 ethBalance;
        uint256 tokenBalance;
        bool isD2Vault;
        address d2AssetAddress;
        IERC20 d2Asset;
        uint256 d2Holdings;
    }

    event XTokenAddressSet(uint256 indexed vaultId, address token);
    event NftAddressSet(uint256 indexed vaultId, address asset);
    event ManagerSet(uint256 indexed vaultId, address manager);
    event XTokenSet(uint256 indexed vaultId);
    event NftSet(uint256 indexed vaultId);
    event HoldingsAdded(uint256 indexed vaultId, uint256 id);
    event HoldingsRemoved(uint256 indexed vaultId, uint256 id);
    event ReservesAdded(uint256 indexed vaultId, uint256 id);
    event ReservesRemoved(uint256 indexed vaultId, uint256 id);
    event RequesterSet(uint256 indexed vaultId, uint256 id, address requester);
    event IsEligibleSet(uint256 indexed vaultId, uint256 id, bool _bool);
    event ShouldReserveSet(uint256 indexed vaultId, uint256 id, bool _bool);
    event AllowMintRequestsSet(uint256 indexed vaultId, bool isAllowed);
    event FlipEligOnRedeemSet(uint256 indexed vaultId, bool _bool);
    event NegateEligibilitySet(uint256 indexed vaultId, bool _bool);
    event IsFinalizedSet(uint256 indexed vaultId, bool _isFinalized);
    event IsClosedSet(uint256 indexed vaultId, bool _isClosed);
    event MintFeesSet(
        uint256 indexed vaultId,
        uint256 ethBase,
        uint256 ethStep
    );
    event BurnFeesSet(
        uint256 indexed vaultId,
        uint256 ethBase,
        uint256 ethStep
    );
    event DualFeesSet(
        uint256 indexed vaultId,
        uint256 ethBase,
        uint256 ethStep
    );
    event SupplierBountySet(
        uint256 indexed vaultId,
        uint256 ethMax,
        uint256 length
    );
    event EthBalanceSet(uint256 indexed vaultId, uint256 _ethBalance);
    event TokenBalanceSet(uint256 indexed vaultId, uint256 _tokenBalance);
    event IsD2VaultSet(uint256 indexed vaultId, bool _isD2Vault);
    event D2AssetAddressSet(uint256 indexed vaultId, address _d2Asset);
    event D2AssetSet(uint256 indexed vaultId);
    event D2HoldingsSet(uint256 indexed vaultId, uint256 _d2Holdings);
    event NewVaultAdded(uint256 indexed vaultId);
    event IsExtensionSet(address addr, bool _isExtension);
    event RandNonceSet(uint256 _randNonce);

    Vault[] internal vaults;

    mapping(address => bool) public isExtension;
    uint256 public randNonce;

    constructor() public {
        initOwnable();
    }

    function _getVault(uint256 vaultId) internal view returns (Vault storage) {
        require(vaultId < vaults.length, "Invalid vaultId");
        return vaults[vaultId];
    }

    function vaultsLength() public view returns (uint256) {
        return vaults.length;
    }

    function xTokenAddress(uint256 vaultId) public view returns (address) {
        Vault storage vault = _getVault(vaultId);
        return vault.xTokenAddress;
    }

    function nftAddress(uint256 vaultId) public view returns (address) {
        Vault storage vault = _getVault(vaultId);
        return vault.nftAddress;
    }

    function manager(uint256 vaultId) public view returns (address) {
        Vault storage vault = _getVault(vaultId);
        return vault.manager;
    }

    function xToken(uint256 vaultId) public view returns (IXToken) {
        Vault storage vault = _getVault(vaultId);
        return vault.xToken;
    }

    function nft(uint256 vaultId) public view returns (IERC721) {
        Vault storage vault = _getVault(vaultId);
        return vault.nft;
    }

    function holdingsLength(uint256 vaultId) public view returns (uint256) {
        Vault storage vault = _getVault(vaultId);
        return vault.holdings.length();
    }

    function holdingsContains(uint256 vaultId, uint256 elem)
        public
        view
        returns (bool)
    {
        Vault storage vault = _getVault(vaultId);
        return vault.holdings.contains(elem);
    }

    function holdingsAt(uint256 vaultId, uint256 index)
        public
        view
        returns (uint256)
    {
        Vault storage vault = _getVault(vaultId);
        return vault.holdings.at(index);
    }

    function reservesLength(uint256 vaultId) public view returns (uint256) {
        Vault storage vault = _getVault(vaultId);
        return vault.holdings.length();
    }

    function reservesContains(uint256 vaultId, uint256 elem)
        public
        view
        returns (bool)
    {
        Vault storage vault = _getVault(vaultId);
        return vault.holdings.contains(elem);
    }

    function reservesAt(uint256 vaultId, uint256 index)
        public
        view
        returns (uint256)
    {
        Vault storage vault = _getVault(vaultId);
        return vault.holdings.at(index);
    }

    function requester(uint256 vaultId, uint256 id)
        public
        view
        returns (address)
    {
        Vault storage vault = _getVault(vaultId);
        return vault.requester[id];
    }

    function isEligible(uint256 vaultId, uint256 id)
        public
        view
        returns (bool)
    {
        Vault storage vault = _getVault(vaultId);
        return vault.isEligible[id];
    }

    function shouldReserve(uint256 vaultId, uint256 id)
        public
        view
        returns (bool)
    {
        Vault storage vault = _getVault(vaultId);
        return vault.shouldReserve[id];
    }

    function allowMintRequests(uint256 vaultId) public view returns (bool) {
        Vault storage vault = _getVault(vaultId);
        return vault.allowMintRequests;
    }

    function flipEligOnRedeem(uint256 vaultId) public view returns (bool) {
        Vault storage vault = _getVault(vaultId);
        return vault.flipEligOnRedeem;
    }

    function negateEligibility(uint256 vaultId) public view returns (bool) {
        Vault storage vault = _getVault(vaultId);
        return vault.negateEligibility;
    }

    function isFinalized(uint256 vaultId) public view returns (bool) {
        Vault storage vault = _getVault(vaultId);
        return vault.isFinalized;
    }

    function isClosed(uint256 vaultId) public view returns (bool) {
        Vault storage vault = _getVault(vaultId);
        return vault.isClosed;
    }

    function mintFees(uint256 vaultId) public view returns (uint256, uint256) {
        Vault storage vault = _getVault(vaultId);
        return (vault.mintFees.ethBase, vault.mintFees.ethStep);
    }

    function burnFees(uint256 vaultId) public view returns (uint256, uint256) {
        Vault storage vault = _getVault(vaultId);
        return (vault.burnFees.ethBase, vault.burnFees.ethStep);
    }

    function dualFees(uint256 vaultId) public view returns (uint256, uint256) {
        Vault storage vault = _getVault(vaultId);
        return (vault.dualFees.ethBase, vault.dualFees.ethStep);
    }

    function supplierBounty(uint256 vaultId)
        public
        view
        returns (uint256, uint256)
    {
        Vault storage vault = _getVault(vaultId);
        return (vault.supplierBounty.ethMax, vault.supplierBounty.length);
    }

    function ethBalance(uint256 vaultId) public view returns (uint256) {
        Vault storage vault = _getVault(vaultId);
        return vault.ethBalance;
    }

    function tokenBalance(uint256 vaultId) public view returns (uint256) {
        Vault storage vault = _getVault(vaultId);
        return vault.tokenBalance;
    }

    function isD2Vault(uint256 vaultId) public view returns (bool) {
        Vault storage vault = _getVault(vaultId);
        return vault.isD2Vault;
    }

    function d2AssetAddress(uint256 vaultId) public view returns (address) {
        Vault storage vault = _getVault(vaultId);
        return vault.d2AssetAddress;
    }

    function d2Asset(uint256 vaultId) public view returns (IERC20) {
        Vault storage vault = _getVault(vaultId);
        return vault.d2Asset;
    }

    function d2Holdings(uint256 vaultId) public view returns (uint256) {
        Vault storage vault = _getVault(vaultId);
        return vault.d2Holdings;
    }

    function setXTokenAddress(uint256 vaultId, address _xTokenAddress)
        public
        onlyOwner
    {
        Vault storage vault = _getVault(vaultId);
        vault.xTokenAddress = _xTokenAddress;
        emit XTokenAddressSet(vaultId, _xTokenAddress);
    }

    function setNftAddress(uint256 vaultId, address _nft) public onlyOwner {
        Vault storage vault = _getVault(vaultId);
        vault.nftAddress = _nft;
        emit NftAddressSet(vaultId, _nft);
    }

    function setManager(uint256 vaultId, address _manager) public onlyOwner {
        Vault storage vault = _getVault(vaultId);
        vault.manager = _manager;
        emit ManagerSet(vaultId, _manager);
    }

    function setXToken(uint256 vaultId) public onlyOwner {
        Vault storage vault = _getVault(vaultId);
        vault.xToken = IXToken(vault.xTokenAddress);
        emit XTokenSet(vaultId);
    }

    function setNft(uint256 vaultId) public onlyOwner {
        Vault storage vault = _getVault(vaultId);
        vault.nft = IERC721(vault.nftAddress);
        emit NftSet(vaultId);
    }

    function holdingsAdd(uint256 vaultId, uint256 elem) public onlyOwner {
        Vault storage vault = _getVault(vaultId);
        vault.holdings.add(elem);
        emit HoldingsAdded(vaultId, elem);
    }

    function holdingsRemove(uint256 vaultId, uint256 elem) public onlyOwner {
        Vault storage vault = _getVault(vaultId);
        vault.holdings.remove(elem);
        emit HoldingsRemoved(vaultId, elem);
    }

    function reservesAdd(uint256 vaultId, uint256 elem) public onlyOwner {
        Vault storage vault = _getVault(vaultId);
        vault.reserves.add(elem);
        emit ReservesAdded(vaultId, elem);
    }

    function reservesRemove(uint256 vaultId, uint256 elem) public onlyOwner {
        Vault storage vault = _getVault(vaultId);
        vault.reserves.remove(elem);
        emit ReservesRemoved(vaultId, elem);
    }

    function setRequester(uint256 vaultId, uint256 id, address _requester)
        public
        onlyOwner
    {
        Vault storage vault = _getVault(vaultId);
        vault.requester[id] = _requester;
        emit RequesterSet(vaultId, id, _requester);
    }

    function setIsEligible(uint256 vaultId, uint256 id, bool _bool)
        public
        onlyOwner
    {
        Vault storage vault = _getVault(vaultId);
        vault.isEligible[id] = _bool;
        emit IsEligibleSet(vaultId, id, _bool);
    }

    function setShouldReserve(uint256 vaultId, uint256 id, bool _shouldReserve)
        public
        onlyOwner
    {
        Vault storage vault = _getVault(vaultId);
        vault.shouldReserve[id] = _shouldReserve;
        emit ShouldReserveSet(vaultId, id, _shouldReserve);
    }

    function setAllowMintRequests(uint256 vaultId, bool isAllowed)
        public
        onlyOwner
    {
        Vault storage vault = _getVault(vaultId);
        vault.allowMintRequests = isAllowed;
        emit AllowMintRequestsSet(vaultId, isAllowed);
    }

    function setFlipEligOnRedeem(uint256 vaultId, bool flipElig)
        public
        onlyOwner
    {
        Vault storage vault = _getVault(vaultId);
        vault.flipEligOnRedeem = flipElig;
        emit FlipEligOnRedeemSet(vaultId, flipElig);
    }

    function setNegateEligibility(uint256 vaultId, bool negateElig)
        public
        onlyOwner
    {
        Vault storage vault = _getVault(vaultId);
        vault.negateEligibility = negateElig;
        emit NegateEligibilitySet(vaultId, negateElig);
    }

    function setIsFinalized(uint256 vaultId, bool _isFinalized)
        public
        onlyOwner
    {
        Vault storage vault = _getVault(vaultId);
        vault.isFinalized = _isFinalized;
        emit IsFinalizedSet(vaultId, _isFinalized);
    }

    function setIsClosed(uint256 vaultId, bool _isClosed) public onlyOwner {
        Vault storage vault = _getVault(vaultId);
        vault.isClosed = _isClosed;
        emit IsClosedSet(vaultId, _isClosed);
    }

    function setMintFees(uint256 vaultId, uint256 ethBase, uint256 ethStep)
        public
        onlyOwner
    {
        Vault storage vault = _getVault(vaultId);
        vault.mintFees = FeeParams(ethBase, ethStep);
        emit MintFeesSet(vaultId, ethBase, ethStep);
    }

    function setBurnFees(uint256 vaultId, uint256 ethBase, uint256 ethStep)
        public
        onlyOwner
    {
        Vault storage vault = _getVault(vaultId);
        vault.burnFees = FeeParams(ethBase, ethStep);
        emit BurnFeesSet(vaultId, ethBase, ethStep);
    }

    function setDualFees(uint256 vaultId, uint256 ethBase, uint256 ethStep)
        public
        onlyOwner
    {
        Vault storage vault = _getVault(vaultId);
        vault.dualFees = FeeParams(ethBase, ethStep);
        emit DualFeesSet(vaultId, ethBase, ethStep);
    }

    function setSupplierBounty(uint256 vaultId, uint256 ethMax, uint256 length)
        public
        onlyOwner
    {
        Vault storage vault = _getVault(vaultId);
        vault.supplierBounty = BountyParams(ethMax, length);
        emit SupplierBountySet(vaultId, ethMax, length);
    }

    function setEthBalance(uint256 vaultId, uint256 _ethBalance)
        public
        onlyOwner
    {
        Vault storage vault = _getVault(vaultId);
        vault.ethBalance = _ethBalance;
        emit EthBalanceSet(vaultId, _ethBalance);
    }

    function setTokenBalance(uint256 vaultId, uint256 _tokenBalance)
        public
        onlyOwner
    {
        Vault storage vault = _getVault(vaultId);
        vault.tokenBalance = _tokenBalance;
        emit TokenBalanceSet(vaultId, _tokenBalance);
    }

    function setIsD2Vault(uint256 vaultId, bool _isD2Vault) public onlyOwner {
        Vault storage vault = _getVault(vaultId);
        vault.isD2Vault = _isD2Vault;
        emit IsD2VaultSet(vaultId, _isD2Vault);
    }

    function setD2AssetAddress(uint256 vaultId, address _d2Asset)
        public
        onlyOwner
    {
        Vault storage vault = _getVault(vaultId);
        vault.d2AssetAddress = _d2Asset;
        emit D2AssetAddressSet(vaultId, _d2Asset);
    }

    function setD2Asset(uint256 vaultId) public onlyOwner {
        Vault storage vault = _getVault(vaultId);
        vault.d2Asset = IERC20(vault.d2AssetAddress);
        emit D2AssetSet(vaultId);
    }

    function setD2Holdings(uint256 vaultId, uint256 _d2Holdings)
        public
        onlyOwner
    {
        Vault storage vault = _getVault(vaultId);
        vault.d2Holdings = _d2Holdings;
        emit D2HoldingsSet(vaultId, _d2Holdings);
    }

    ////////////////////////////////////////////////////////////

    function addNewVault() public onlyOwner returns (uint256) {
        Vault memory newVault;
        vaults.push(newVault);
        uint256 vaultId = vaults.length.sub(1);
        emit NewVaultAdded(vaultId);
        return vaultId;
    }

    function setIsExtension(address addr, bool _isExtension) public onlyOwner {
        isExtension[addr] = _isExtension;
        emit IsExtensionSet(addr, _isExtension);
    }

    function setRandNonce(uint256 _randNonce) public onlyOwner {
        randNonce = _randNonce;
        emit RandNonceSet(_randNonce);
    }
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"string","name":"name","type":"string"},{"internalType":"string","name":"symbol","type":"string"},{"internalType":"address","name":"_owner","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"burn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"burnFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"name","type":"string"}],"name":"changeName","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"symbol","type":"string"}],"name":"changeSymbol","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"mint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

Deployed Bytecode

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Swarm Source

ipfs://ae8763d5b7dccef1e5c85eb0e4132d1e9ebdbfbe0551c813cef8d5cdbac6bf59

Block Transaction Difficulty Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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Validator Index Block Amount
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Transaction Hash Block Value Eth2 PubKey Valid
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.