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// SPDX-License-Identifier: MIT

// Lepton2.sol -- Part of the Charged Particles Protocol
// Copyright (c) 2021 Firma Lux, Inc. <https://charged.fi>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

pragma solidity 0.6.12;

import "../lib/ERC721Basic.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721Enumerable.sol";

import "../interfaces/ILepton.sol";
import "../lib/BlackholePrevention.sol";


contract Lepton2 is ILepton, ERC721Basic, Ownable, ReentrancyGuard, BlackholePrevention {
  using SafeMath for uint256;
  using Address for address payable;

  Classification[] internal _leptonTypes;

  uint256 internal _typeIndex;
  uint256 internal _maxSupply;
  uint256 internal _maxMintPerTx;
  uint256 internal _migratedCount;

  bool internal _paused;
  bool internal _migrationComplete;


  /***********************************|
  |          Initialization           |
  |__________________________________*/

  constructor() public ERC721Basic("Charged Particles - Lepton2", "LEPTON2") {
    _paused = true;
  }


  /***********************************|
  |              Public               |
  |__________________________________*/

  function mintLepton() external payable override nonReentrant whenNotPaused returns (uint256 newTokenId) {
    newTokenId = _mintLepton(msg.sender);
  }

  function batchMintLepton(uint256 count) external payable override nonReentrant whenNotPaused {
    _batchMintLepton(msg.sender, count);
  }

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

  function maxSupply() external view returns (uint256) {
    return _maxSupply;
  }

  function getNextType() external view override returns (uint256) {
    if (_typeIndex >= _leptonTypes.length) { return 0; }
    return _typeIndex;
  }

  function getNextPrice() external view override returns (uint256) {
    if (_typeIndex >= _leptonTypes.length) { return 0; }
    return _leptonTypes[_typeIndex].price;
  }

  function getMultiplier(uint256 tokenId) external view override returns (uint256) {
    require(_exists(tokenId), "LPT:E-405");
    return _getLepton(tokenId).multiplier;
  }

  function getBonus(uint256 tokenId) external view override returns (uint256) {
    require(_exists(tokenId), "LPT:E-405");
    return _getLepton(tokenId).bonus;
  }

  function tokenURI(uint256 tokenId) public view override returns (string memory) {
    require(_exists(tokenId), "LPT:E-405");
    return _getLepton(tokenId).tokenUri;
  }

  /***********************************|
  |          Only Admin/DAO           |
  |__________________________________*/

  function addLeptonType(
    string calldata tokenUri,
    uint256 price,
    uint32 supply,
    uint32 multiplier,
    uint32 bonus
  )
    external
    onlyOwner
  {
    _maxSupply = _maxSupply.add(uint256(supply));

    Classification memory lepton = Classification({
      tokenUri: tokenUri,
      price: price,
      supply: supply,
      multiplier: multiplier,
      bonus: bonus,
      _upperBounds: uint128(_maxSupply)
    });
    _leptonTypes.push(lepton);

    emit LeptonTypeAdded(tokenUri, price, supply, multiplier, bonus, _maxSupply);
  }

  function updateLeptonType(
    uint256 leptonIndex,
    string calldata tokenUri,
    uint256 price,
    uint32 supply,
    uint32 multiplier,
    uint32 bonus
  )
    external
    onlyOwner
  {
    _leptonTypes[leptonIndex].tokenUri = tokenUri;
    _leptonTypes[leptonIndex].price = price;
    _leptonTypes[leptonIndex].supply = supply;
    _leptonTypes[leptonIndex].multiplier = multiplier;
    _leptonTypes[leptonIndex].bonus = bonus;

    emit LeptonTypeUpdated(leptonIndex, tokenUri, price, supply, multiplier, bonus, _maxSupply);
  }

  function setMaxMintPerTx(uint256 maxAmount) external onlyOwner {
    _maxMintPerTx = maxAmount;
    emit MaxMintPerTxSet(maxAmount);
  }

  function setPausedState(bool state) external onlyOwner whenMigrated {
    _paused = state;
    emit PausedStateSet(state);
  }


  /***********************************|
  |          Only Admin/DAO           |
  |      (blackhole prevention)       |
  |__________________________________*/

  function withdrawEther(address payable receiver, uint256 amount) external onlyOwner {
    _withdrawEther(receiver, amount);
  }

  function withdrawErc20(address payable receiver, address tokenAddress, uint256 amount) external onlyOwner {
    _withdrawERC20(receiver, tokenAddress, amount);
  }

  function withdrawERC721(address payable receiver, address tokenAddress, uint256 tokenId) external onlyOwner {
    _withdrawERC721(receiver, tokenAddress, tokenId);
  }

  function migrateAccounts(address oldLeptonContract, uint256 count) external onlyOwner whenNotMigrated {
    uint256 oldSupply = IERC721Enumerable(oldLeptonContract).totalSupply();
    if (oldSupply > 0) {
      require(oldSupply > _migratedCount, "LPT:E-004");

      uint256 endTokenId = _migratedCount.add(count);
      if (endTokenId > oldSupply) {
        count = count.sub(endTokenId.sub(oldSupply));
      }

      for (uint256 i = 1; i <= count; i++) {
        uint256 tokenId = _migratedCount.add(i);
        address tokenOwner = IERC721(oldLeptonContract).ownerOf(tokenId);
        _mint(tokenOwner);
      }
      _migratedCount = _tokenCount;
    }

    if (oldSupply == _migratedCount) {
      _finalizeMigration();
    }
  }

  /***********************************|
  |         Private Functions         |
  |__________________________________*/

  function _getLepton(uint256 tokenId) internal view returns (Classification memory) {
    uint256 types = _leptonTypes.length;
    for (uint256 i = 0; i < types; i++) {
      Classification memory lepton = _leptonTypes[i];
      if (tokenId <= lepton._upperBounds) {
        return lepton;
      }
    }
  }

  function _mintLepton(address receiver) internal returns (uint256 newTokenId) {
    require(_typeIndex < _leptonTypes.length, "LPT:E-408");

    Classification memory lepton = _leptonTypes[_typeIndex];
    require(msg.value >= lepton.price, "LPT:E-414");

    newTokenId = _safeMint(receiver, "");

    // Determine Next Type
    if (newTokenId == lepton._upperBounds) {
      _typeIndex = _typeIndex.add(1);
    }

    _refundOverpayment(lepton.price);
  }

  function _batchMintLepton(address receiver, uint256 count) internal {
    require(_typeIndex < _leptonTypes.length, "LPT:E-408");
    require(_maxMintPerTx == 0 || count <= _maxMintPerTx, "LPT:E-429");

    Classification memory lepton = _leptonTypes[_typeIndex];

    uint256 endTokenId = _tokenCount.add(count);
    if (endTokenId > lepton._upperBounds) {
      count = count.sub(endTokenId.sub(lepton._upperBounds));
    }

    uint256 salePrice = lepton.price.mul(count);
    require(msg.value >= salePrice, "LPT:E-414");

    _safeMintBatch(receiver, count, "");

    // Determine Next Type
    if (endTokenId >= lepton._upperBounds) {
      _typeIndex = _typeIndex.add(1);
    }

    _refundOverpayment(salePrice);
  }

  function _refundOverpayment(uint256 threshold) internal {
    uint256 overage = msg.value.sub(threshold);
    if (overage > 0) {
      payable(_msgSender()).sendValue(overage);
    }
  }

  function _finalizeMigration() internal {
    // Determine Next Type
    _typeIndex = 0;
    for (uint256 i = 0; i < _leptonTypes.length; i++) {
      Classification memory lepton = _leptonTypes[i];
      if (_migratedCount >= lepton._upperBounds) {
        _typeIndex = i + 1;
      }
    }
    _migrationComplete = true;
  }


  /***********************************|
  |             Modifiers             |
  |__________________________________*/

  modifier whenMigrated() {
    require(_migrationComplete, "LPT:E-003");
    _;
  }

  modifier whenNotMigrated() {
    require(!_migrationComplete, "LPT:E-004");
    _;
  }

  modifier whenNotPaused() {
    require(!_paused, "LPT:E-101");
    _;
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "@openzeppelin/contracts/GSN/Context.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721Metadata.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";
import "@openzeppelin/contracts/introspection/ERC165.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/utils/Address.sol";

/**
 * @title ERC721 Non-Fungible Token Standard basic implementation
 * @dev see https://eips.ethereum.org/EIPS/eip-721
 */
contract ERC721Basic is Context, ERC165, IERC721, IERC721Metadata {
  using SafeMath for uint256;
  using Address for address;

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

  // mapping from token ids to their owners
  mapping (uint256 => address) internal _tokenOwners;

  // mapping from owner to token balance
  mapping (address => uint256) internal _ownerBalance;

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

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

  // Token name
  string internal _name;

  // Token symbol
  string internal _symbol;

  // Token Count
  uint256 internal _tokenCount;

  /*
    *     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 ^ 0xe985e9c ^ 0x23b872dd ^ 0x42842e0e ^ 0xb88d4fde == 0x80ac58cd
    */
  bytes4 internal constant _INTERFACE_ID_ERC721 = 0x80ac58cd;

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

  /**
    * @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);
  }

  /**
    * @dev See {IERC721-balanceOf}.
    */
  function balanceOf(address owner) public view override returns (uint256) {
    require(owner != address(0), "ERC721:E-403");
    return _ownerBalance[owner];
  }

  /**
    * @dev See {IERC721-ownerOf}.
    */
  function ownerOf(uint256 tokenId) public view override returns (address) {
    return _tokenOwners[tokenId];
  }

  /**
    * @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 virtual override returns (string memory) {
    return "";
  }

  /**
    * @dev See {IERC721-approve}.
    */
  function approve(address to, uint256 tokenId) public virtual override {
    address owner = ownerOf(tokenId);
    require(to != owner, "ERC721:E-111");

    require(_msgSender() == owner || isApprovedForAll(owner, _msgSender()), "ERC721:E-105");

    _approve(to, tokenId);
  }

  /**
    * @dev See {IERC721-getApproved}.
    */
  function getApproved(uint256 tokenId) public view override returns (address) {
    require(_exists(tokenId), "ERC721:E-405");
    return _tokenApprovals[tokenId];
  }

  /**
    * @dev See {IERC721-setApprovalForAll}.
    */
  function setApprovalForAll(address operator, bool approved) public virtual override {
    require(operator != _msgSender(), "ERC721:E-111");

    _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:E-105");

    _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:E-105");
    _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 mecanisms 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:E-402");
  }

  /**
    * @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[tokenId] != address(0x0);
  }

  /**
    * @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:E-405");
    address owner = ownerOf(tokenId);
    return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
  }

  /**
    * @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, bytes memory _data) internal virtual returns (uint256) {
    uint256 tokenId = _mint(to);
    require(_checkOnERC721Received(address(0), to, tokenId, _data), "ERC721:E-402");
    return 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 _safeMintBatch(address to, uint256 count, bytes memory _data) internal virtual {
    uint256 startTokenId = _mintBatch(to, count);
    require(_checkOnERC721Received(address(0), to, startTokenId, _data), "ERC721:E-402");
  }

  /**
    * @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) internal virtual returns (uint256) {
    require(to != address(0), "ERC721:E-403");

    _tokenCount = _tokenCount.add(1);
    uint256 tokenId = _tokenCount;
    require(!_exists(tokenId), "ERC721:E-407");

    _tokenOwners[tokenId] = to;
    _ownerBalance[to] = _ownerBalance[to].add(1);

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

  /**
    * @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 _mintBatch(address to, uint256 count) internal virtual returns (uint256) {
    require(to != address(0), "ERC721:E-403");

    uint256 startTokenId = _tokenCount.add(1);
    for (uint i = 1; i <= count; i++) {
      uint256 tokenId = _tokenCount.add(i);
      _tokenOwners[tokenId] = to;
      emit Transfer(address(0), to, tokenId);
    }

    _tokenCount = _tokenCount.add(count);
    _ownerBalance[to] = _ownerBalance[to].add(count);
    return startTokenId;
  }

  /**
    * @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:E-102");
    require(to != address(0), "ERC721:E-403");

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

    _tokenOwners[tokenId] = to;
    _ownerBalance[from] = _ownerBalance[from].sub(1);
    _ownerBalance[to] = _ownerBalance[to].add(1);

    emit Transfer(from, to, tokenId);
  }

  /**
    * @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)
    internal returns (bool)
  {
    if (!to.isContract()) {
      return true;
    }
    bytes memory returndata = to.functionCall(abi.encodeWithSelector(
      IERC721Receiver(to).onERC721Received.selector,
      _msgSender(),
      from,
      tokenId,
      _data
    ), "ERC721:E-402");
    bytes4 retval = abi.decode(returndata, (bytes4));
    return (retval == _ERC721_RECEIVED);
  }

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

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

        return c;
    }

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

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

        return c;
    }

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

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

        return c;
    }

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

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

        return c;
    }

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

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

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

    uint256 private _status;

    constructor () internal {
        _status = _NOT_ENTERED;
    }

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

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

        _;

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

import "../../introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transfered 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;
}

// 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);
}

// SPDX-License-Identifier: MIT

// ILepton.sol -- Part of the Charged Particles Protocol
// Copyright (c) 2021 Firma Lux, Inc. <https://charged.fi>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

pragma solidity >=0.6.0;

/**
 * @title Charged Particles Lepton Interface
 * @dev ...
 */
interface ILepton {

  struct Classification {
    string tokenUri;
    uint256 price;
    uint128 _upperBounds;
    uint32 supply;
    uint32 multiplier;
    uint32 bonus;
  }

  function mintLepton() external payable returns (uint256 newTokenId);
  function batchMintLepton(uint256 count) external payable;
  function getNextType() external view returns (uint256);
  function getNextPrice() external view returns (uint256);
  function getMultiplier(uint256 tokenId) external view returns (uint256);
  function getBonus(uint256 tokenId) external view returns (uint256);


  event MaxMintPerTxSet(uint256 maxAmount);
  event LeptonTypeAdded(string tokenUri, uint256 price, uint32 supply, uint32 multiplier, uint32 bonus, uint256 upperBounds);
  event LeptonTypeUpdated(uint256 leptonIndex, string tokenUri, uint256 price, uint32 supply, uint32 multiplier, uint32 bonus, uint256 upperBounds);
  event LeptonMinted(address indexed receiver, uint256 indexed tokenId, uint256 price, uint32 multiplier);
  event LeptonBatchMinted(address indexed receiver, uint256 indexed tokenId, uint256 count, uint256 price, uint32 multiplier);
  event PausedStateSet(bool isPaused);
}

// SPDX-License-Identifier: MIT

// BlackholePrevention.sol -- Part of the Charged Particles Protocol
// Copyright (c) 2021 Firma Lux, Inc. <https://charged.fi>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

pragma solidity >=0.6.0;

import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";

/**
 * @notice Prevents ETH or Tokens from getting stuck in a contract by allowing
 *  the Owner/DAO to pull them out on behalf of a user
 * This is only meant to contracts that are not expected to hold tokens, but do handle transferring them.
 */
contract BlackholePrevention {
  using Address for address payable;
  using SafeERC20 for IERC20;

  event WithdrawStuckEther(address indexed receiver, uint256 amount);
  event WithdrawStuckERC20(address indexed receiver, address indexed tokenAddress, uint256 amount);
  event WithdrawStuckERC721(address indexed receiver, address indexed tokenAddress, uint256 indexed tokenId);

  function _withdrawEther(address payable receiver, uint256 amount) internal virtual {
    require(receiver != address(0x0), "BHP:E-403");
    if (address(this).balance >= amount) {
      receiver.sendValue(amount);
      emit WithdrawStuckEther(receiver, amount);
    }
  }

  function _withdrawERC20(address payable receiver, address tokenAddress, uint256 amount) internal virtual {
    require(receiver != address(0x0), "BHP:E-403");
    if (IERC20(tokenAddress).balanceOf(address(this)) >= amount) {
      IERC20(tokenAddress).safeTransfer(receiver, amount);
      emit WithdrawStuckERC20(receiver, tokenAddress, amount);
    }
  }

  function _withdrawERC721(address payable receiver, address tokenAddress, uint256 tokenId) internal virtual {
    require(receiver != address(0x0), "BHP:E-403");
    if (IERC721(tokenAddress).ownerOf(tokenId) == address(this)) {
      IERC721(tokenAddress).transferFrom(address(this), receiver, tokenId);
      emit WithdrawStuckERC721(receiver, tokenAddress, tokenId);
    }
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

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);
}

// 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);
}

// 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;
    }
}

// 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);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

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

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

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

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

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

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

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

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

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

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

• No Contract Security Audit Submitted- Submit Audit Here

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payable","name":"receiver","type":"address"},{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"withdrawERC721","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address payable","name":"receiver","type":"address"},{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdrawErc20","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address payable","name":"receiver","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdrawEther","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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