Contract 0x62d7E2484FCFc6752B9473260efE1B86caBAc34e

 
 
Txn Hash Method
Block
From
To
Value [Txn Fee]
0xf30ce1f4915e8b0f13bef11ff45a8e1039120e6d2a3ac42a63a8478b448e5a2bSet Approval For...333975472022-09-21 20:51:502 days 22 hrs ago0xcaee94934f4007ae92188a3c8a9a2a8ac609ebb9 IN  0x62d7e2484fcfc6752b9473260efe1b86cabac34e0 MATIC0.001479984005 32.082200803
0x67c6dace68bd6d71ce44e8d10ca263c3900d984c397462cbe18b476eecf069c6Close Deposit329553672022-09-11 3:58:5013 days 15 hrs ago0x1bc64307e6ddc620635b862fd2051be32bbf26a3 IN  0x62d7e2484fcfc6752b9473260efe1b86cabac34e0 MATIC0.00560806320337.335813504
0x4ce9d9ef81224149f0dc2c18411095d7e921a60fae885873f9794e83f3c6319aWithdraw Rewards329553612022-09-11 3:58:3813 days 15 hrs ago0x1bc64307e6ddc620635b862fd2051be32bbf26a3 IN  0x62d7e2484fcfc6752b9473260efe1b86cabac34e0 MATIC0.00383293195137.335813518
0x61354e46b062556fd794f5090f674346258918d18ac8cd7bd74df7546a613a3cSet Approval For...328043352022-09-07 12:25:2317 days 6 hrs ago0xb38a4f3ab914bdbaa8a3f53b4322885984b6835f IN  0x62d7e2484fcfc6752b9473260efe1b86cabac34e0 MATIC0.00138876079 30.05000088
0xa6362a9ef014c445240366751ae01abe0a92225f5b5d26e64a6d2bd04a7696abSet Approval For...325825212022-09-02 4:01:5822 days 15 hrs ago0x119460ecc4c538a02307e5d4f687bb83eddc5cf9 IN  0x62d7e2484fcfc6752b9473260efe1b86cabac34e0 MATIC0.0011786955 48.5
0x1da5f5956b19d472a4bf4bdf866ae21f8e0851b7179c113d2d8420cdcc8bf4efSet Approval For...325824992022-09-02 4:01:1422 days 15 hrs ago0x119460ecc4c538a02307e5d4f687bb83eddc5cf9 IN  0x62d7e2484fcfc6752b9473260efe1b86cabac34e0 MATIC0.000742578165 30.555000013
0xc526fae07e38e6f76e7e66af0c519d8084ab83142fb03e122843c9b4156c1f01Create Deposit324503782022-08-29 13:51:0626 days 5 hrs ago0x18217753c967721b7a8fe8f67fb330a1914d1323 IN  0x62d7e2484fcfc6752b9473260efe1b86cabac34e0 MATIC0.010185595347 31.63837555
0xb10b1e34a8410907856a31c1a9a51492ccc25ab55c5c23364a30afb4c4c47c7fClose Deposit324503282022-08-29 13:49:2226 days 5 hrs ago0x18217753c967721b7a8fe8f67fb330a1914d1323 IN  0x62d7e2484fcfc6752b9473260efe1b86cabac34e0 MATIC0.007218395419 47.321018086
0x9bfe762029f149423940ec9d0000bfe59d699fa03e655f3474a8a6142e56205cWithdraw Rewards324036222022-08-28 6:13:2327 days 12 hrs ago0xb3aaaf830beb060584d5097b464cc4b9e0f04dd4 IN  0x62d7e2484fcfc6752b9473260efe1b86cabac34e0 MATIC0.003345927312 32.592000007
0x3bcb5f4c1fb4fed867cf8eb47fc213309c311bb7acc83068c0cf3c4b5f456fc9Withdraw Rewards323409712022-08-26 11:26:3429 days 7 hrs ago0xb38a4f3ab914bdbaa8a3f53b4322885984b6835f IN  0x62d7e2484fcfc6752b9473260efe1b86cabac34e0 MATIC0.014044698633 164.123432747
0xdc7494521f2062560cd649fc33ff791aebf777a14ff32076a69801c4ac97195eWithdraw Rewards323409692022-08-26 11:26:2629 days 7 hrs ago0xb38a4f3ab914bdbaa8a3f53b4322885984b6835f IN  0x62d7e2484fcfc6752b9473260efe1b86cabac34e0 MATIC0.015784844618 153.737505297
0x6e2b0e43fe06d650cd0377832aa7589331cb1c2ecaff6bc726f07c75f3381c99Withdraw Rewards321162112022-08-20 15:30:5535 days 3 hrs ago0xb38a4f3ab914bdbaa8a3f53b4322885984b6835f IN  0x62d7e2484fcfc6752b9473260efe1b86cabac34e0 MATIC0.003879255913 37.782261459
0xef4c3caebd964f57424fe991d26f7d18f0ff87ee7810564d0585ba444df94036Withdraw Rewards321139732022-08-20 14:08:4735 days 5 hrs ago0xb38a4f3ab914bdbaa8a3f53b4322885984b6835f IN  0x62d7e2484fcfc6752b9473260efe1b86cabac34e0 MATIC0.003142338714 30.605009197
0xad7ef8ab66ebaa3dd6afd0d7946cb7c9cde61186d836b26b4abd3cfe243d06eeClose Deposit315465462022-08-05 11:27:0550 days 7 hrs ago0xc542cc1cdf2d93e244e2d71bcbbdaf1eb5da5da2 IN  0x62d7e2484fcfc6752b9473260efe1b86cabac34e0 MATIC0.005156551707 31.040004021
0x2786c5a51a5d3d2f734c17ceb6cb5afd16b03385ad0d33d7c73ef63d395fe75eClose Deposit315156932022-08-04 15:46:5951 days 3 hrs ago0xf9baa6520b9eb8a5a94c9fa7279e5ed85bd693b2 IN  0x62d7e2484fcfc6752b9473260efe1b86cabac34e0 MATIC0.004617693538 30.742404024
0x0340c433901df8031d6a7f5413a5140d746c9ab9949c28d94c8f0c25f1cd9370Close Deposit315156452022-08-04 15:45:1951 days 3 hrs ago0xf9baa6520b9eb8a5a94c9fa7279e5ed85bd693b2 IN  0x62d7e2484fcfc6752b9473260efe1b86cabac34e0 MATIC0.005111760003 30.000000022
0x97f4423c56be7843822dec59ada5067debedffe9451b0e091d16da44b6f97c11Set Approval For...315156352022-08-04 15:44:5951 days 3 hrs ago0xf9baa6520b9eb8a5a94c9fa7279e5ed85bd693b2 IN  0x62d7e2484fcfc6752b9473260efe1b86cabac34e0 MATIC0.001386450001 30.000000023
0x54c003a73d18c115246642dedef6e1119d2e2828dfa93aeb90656b751042d0d1Set Approval For...313193472022-07-30 15:29:2756 days 3 hrs ago0xf56036f6a5d9b9991c209dcbc9c40b2c1cd46540 IN  0x62d7e2484fcfc6752b9473260efe1b86cabac34e0 MATIC0.00152581085 33.015489572
0x839b1c83b48e1507331f73d3dab6d7311d305e17a6287f69e55f077eddf13853Set Approval For...312952082022-07-30 0:40:4356 days 18 hrs ago0x01c7ec780982eedc13d3ddc7ec8aa8c23880887b IN  0x62d7e2484fcfc6752b9473260efe1b86cabac34e0 MATIC0.001748313499 37.830001069
0xdd40be53c567fc6bbd3fd29bf723dd3bc37059d0631a16c78f8cb7b0e561f7ecWithdraw Rewards311307872022-07-25 18:31:3861 days 38 mins ago0xb3aaaf830beb060584d5097b464cc4b9e0f04dd4 IN  0x62d7e2484fcfc6752b9473260efe1b86cabac34e0 MATIC0.003086016912 36.068032306
0xfb40ca887892382675c1a7cbbc55c83d6a5092878371f449647fcfd402235394Set Approval For...310422212022-07-23 8:18:4863 days 10 hrs ago0x8d61eff2f1eed647a5948e630334975dab07ee6f IN  0x62d7e2484fcfc6752b9473260efe1b86cabac34e0 MATIC0.000788552363 32.446708777
0x6b206cd86b7a047c9e304c7436181610c72f00ac49697f39d8e3d1616d689d8eClose Deposit309005962022-07-19 14:32:1167 days 4 hrs ago0x4ffd0a59a26cb2aa76d403215e4cc2845c053994 IN  0x62d7e2484fcfc6752b9473260efe1b86cabac34e0 MATIC0.0050032521 30.1
0x8d8dbf1abbda6f4bd83357a7b9255be136f2dcc5fc9b022a4431b4ac2e1f1710Close Deposit308607822022-07-18 12:38:4368 days 6 hrs ago0x27b61c5cff2d7d916e00a82eed2055a00508ca84 IN  0x62d7e2484fcfc6752b9473260efe1b86cabac34e0 MATIC0.004792582794 31.437904535
0x72c78a4b1b799537989b3a776bec915a0a19e7d974a98c1ef48ec599930930a4Create Deposit307603312022-07-15 18:24:4371 days 45 mins ago0xb38a4f3ab914bdbaa8a3f53b4322885984b6835f IN  0x62d7e2484fcfc6752b9473260efe1b86cabac34e0 MATIC0.009160381916 30.050000053
0x27d6cedc0788837f192f6415d8afd32053d685cb64183cf536d420ec762a89d6Create Deposit306548292022-07-12 20:53:2373 days 22 hrs ago0xb38a4f3ab914bdbaa8a3f53b4322885984b6835f IN  0x62d7e2484fcfc6752b9473260efe1b86cabac34e0 MATIC0.009674597504 30.050000015
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Contract Source Code Verified (Exact Match)

Contract Name:
HoneyFarm

Compiler Version
v0.7.6+commit.7338295f

Optimization Enabled:
Yes with 10000 runs

Other Settings:
default evmVersion, GNU GPLv3 license

Contract Source Code (Solidity)

/**
 *Submitted for verification at polygonscan.com on 2021-07-01
*/

// original repo: https://github.com/1hive/honeyswap-farm
// SPDX-License-Identifier: GPL-3.0-only


// File: @openzeppelin/contracts/utils/Context.sol
pragma solidity >=0.6.0 <0.8.0;

/*
 * @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;
    }
}

// File: @openzeppelin/contracts/introspection/IERC165.sol
pragma solidity ^0.7.0;

/**
 * @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: @openzeppelin/contracts/token/ERC721/IERC721.sol
pragma solidity ^0.7.0;

/**
 * @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: @openzeppelin/contracts/token/ERC721/IERC721Metadata.sol
pragma solidity ^0.7.0;


/**
 * @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: @openzeppelin/contracts/token/ERC721/IERC721Enumerable.sol
pragma solidity ^0.7.0;

/**
 * @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: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol
pragma solidity ^0.7.0;

/**
 * @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: @openzeppelin/contracts/introspection/ERC165.sol
pragma solidity ^0.7.0;

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts may inherit from this and call {_registerInterface} to declare
 * their support of an interface.
 */
abstract 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 () {
        // 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 virtual 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: @openzeppelin/contracts/math/SafeMath.sol
pragma solidity ^0.7.0;

/**
 * @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, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, 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 (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @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) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @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) {
        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, reverting 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) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting 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) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * 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);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * 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);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * 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: @openzeppelin/contracts/utils/Address.sol
pragma solidity ^0.7.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

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

// File: @openzeppelin/contracts/utils/EnumerableSet.sol
pragma solidity ^0.7.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
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];
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

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

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

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

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

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }


    // 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: @openzeppelin/contracts/utils/EnumerableMap.sol
pragma solidity ^0.7.0;

/**
 * @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 Tries to returns the value associated with `key`.  O(1).
     * Does not revert if `key` is not in the map.
     */
    function _tryGet(Map storage map, bytes32 key) private view returns (bool, bytes32) {
        uint256 keyIndex = map._indexes[key];
        if (keyIndex == 0) return (false, 0); // Equivalent to contains(map, key)
        return (true, map._entries[keyIndex - 1]._value); // All indexes are 1-based
    }

    /**
     * @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) {
        uint256 keyIndex = map._indexes[key];
        require(keyIndex != 0, "EnumerableMap: nonexistent key"); // Equivalent to contains(map, key)
        return map._entries[keyIndex - 1]._value; // All indexes are 1-based
    }

    /**
     * @dev Same as {_get}, with a custom error message when `key` is not in the map.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {_tryGet}.
     */
    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(uint160(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(uint160(uint256(value))));
    }

    /**
     * @dev Tries to returns the value associated with `key`.  O(1).
     * Does not revert if `key` is not in the map.
     *
     * _Available since v3.4._
     */
    function tryGet(UintToAddressMap storage map, uint256 key) internal view returns (bool, address) {
        (bool success, bytes32 value) = _tryGet(map._inner, bytes32(key));
        return (success, address(uint160(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(uint160(uint256(_get(map._inner, bytes32(key)))));
    }

    /**
     * @dev Same as {get}, with a custom error message when `key` is not in the map.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryGet}.
     */
    function get(UintToAddressMap storage map, uint256 key, string memory errorMessage) internal view returns (address) {
        return address(uint160(uint256(_get(map._inner, bytes32(key), errorMessage))));
    }
}

// File: @openzeppelin/contracts/utils/Strings.sol
pragma solidity ^0.7.0;

/**
 * @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--] = bytes1(uint8(48 + temp % 10));
            temp /= 10;
        }
        return string(buffer);
    }
}

// File: @openzeppelin/contracts/token/ERC721/ERC721.sol
pragma solidity ^0.7.0;












/**
 * @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_) {
        _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 virtual 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 virtual override returns (address) {
        return _tokenOwners.get(tokenId, "ERC721: owner query for nonexistent token");
    }

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

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

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

        string memory _tokenURI = _tokenURIs[tokenId];
        string memory base = baseURI();

        // If there is no base URI, return the token URI.
        if (bytes(base).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(base, _tokenURI));
        }
        // If there is a baseURI but no tokenURI, concatenate the tokenID to the baseURI.
        return string(abi.encodePacked(base, 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 virtual returns (string memory) {
        return _baseURI;
    }

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

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual 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 virtual 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 = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(_msgSender() == owner || ERC721.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 virtual 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 virtual 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 virtual 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 virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || ERC721.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, "");
    }

    /**
     * @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 = ERC721.ownerOf(tokenId); // internal owner

        _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(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own"); // internal owner
        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(ERC721.ownerOf(tokenId), to, tokenId); // internal owner
    }

    /**
     * @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: @openzeppelin/contracts/token/ERC20/IERC20.sol
pragma solidity ^0.7.0;

/**
 * @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);
}

// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol
pragma solidity ^0.7.0;

/**
 * @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: @openzeppelin/contracts/math/Math.sol
pragma solidity ^0.7.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow, so we distribute
        return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol
pragma solidity ^0.7.0;

/**
 * @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.
 */
abstract 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 () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual 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: contracts/IHoneyFarm.sol
pragma solidity ^0.7.6;


interface IHoneyFarm {
    function depositAdditionalRewards(uint256 _depositAmount) external;
    function disableContract(address _tokenRecipient) external;
    function setBaseURI(string memory baseURI_) external;
    function add(IERC20 _lpToken, uint256 _allocation) external;
    function set(IERC20 _poolToken, uint256 _allocation) external;
    function setRewardManager(address _rewardManager) external;
}

// File: contracts/IRewardManager.sol
pragma solidity ^0.7.6;

interface IRewardManager {
    function distributeReward(address _referrer, uint256 _amount) external;
    function grantFundsAccess() external;
    function rebalance() external;

    event MissingReward(address indexed referrer, uint256 owedReward);
    event FundsAccessGranted(address indexed spender);
    event FundsAccessRevoked(address indexed spender);
}

// File: contracts/HoneyFarm.sol
pragma solidity 0.7.6;

// Forked from sushiswap's MasterChef contract
contract HoneyFarm is IHoneyFarm, Ownable, ERC721 {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;
    using EnumerableSet for EnumerableSet.AddressSet;

    // Info of each deposit
    struct DepositInfo {
        uint256 amount; // How many LP tokens the user has provided.
        uint256 rewardDebt; // Reward debt (value of accumulator)
        uint256 unlockTime;
        uint256 rewardShare;
        uint256 setRewards;
        IERC20 pool;
        address referrer;
    }

    // Info of each pool.
    struct PoolInfo {
        uint256 allocation; // How many allocation points assigned to this pool.
        /* Last block timestamp that HSFs distribution occured, initially set
           to the startTime. */
        uint256 lastRewardTimestamp;
        uint256 accHsfPerShare; // Accumulated HSFs per share, times SCALE.
        uint256 totalShares; // total shares stored in pool
    }

    // What fractional numbers are scaled by
    uint256 public constant SCALE = 1e18;
    // The HoneySwap Farm token
    IERC20 public immutable hsf;
    // Manages referrals and additional rewards
    IRewardManager public rewardManager;
    // Info of each pool.
    mapping(IERC20 => PoolInfo) public poolInfo;
    // set of running pools
    EnumerableSet.AddressSet internal pools;
    // Total allocation points. Must be the sum of all allocation points in all pools.
    uint256 public totalAllocationPoints;
    // total deposits
    uint256 public totalDeposits;
    // data about infdividual deposits
    mapping(uint256 => DepositInfo) public depositInfo;
    // the negative slope of the distribution line scaled by SCALE, how much
    // less is being distributed per unit of time.
    uint256 public immutable distributionSlope;
    // starting distribution rate / unit time scaled by SCALE
    uint256 public immutable startDistribution;
    // minimum time someone can lock their liquidity for
    uint256 public immutable minTimeLock;
    // maximum time someone can lock their liquidity for
    uint256 public immutable maxTimeLock;
    // time at which coins begin being distributed
    uint256 public immutable startTime;
    // time at which coins finish being distributed
    uint256 public immutable endTime;
    // multiplier for time locked deposits / second locked scaled by SCALE
    uint256 public immutable timeLockMultiplier;
    // constant added to the timeLockMultiplier scaled by SCALE
    uint256 public immutable timeLockConstant;
    /* One time fee that is deducted from time-locked deposits given to whoever
       downgrades it, scaled by SCALE */
    uint256 public immutable downgradeFee;
    // whether this contract has been disabled
    uint256 public contractDisabledAt;

    event PoolAdded(IERC20 indexed poolToken, uint256 allocation);
    /* fired when pool parameters are updated not when the updatePool() method
       is called */
    event PoolUpdated(IERC20 indexed poolToken, uint256 allocation);
    event PoolRemoved(IERC20 indexed poolToken);
    event Disabled();
    event DepositDowngraded(
        address indexed downgrader,
        uint256 indexed depositId,
        uint256 downgradeReward
    );
    event Referred(address indexed referrer, uint256 depositId);
    event RewardsWithdraw(uint256 indexed depositId, uint256 rewardAmount);
    event RewardsAdded(uint256 additionalRewardAmount);
    event RewardManagerSet(address indexed rewardManager);

    // parameters passed as byte strings to mitigate stack too deep error
    constructor(
        IERC20 _hsf,
        // uint256 _startTime,
        // uint256 _endTime,
        // uint256 _totalHsfToDistribute,
        // uint256 _endDistributionFraction,
        // uint256 _minTimeLock,
        // uint256 _maxTimeLock,
        // uint256 _timeLockMultiplier,
        // uint256 _timeLockConstant,
        // uint256 _downgradeFee
        uint256[9] memory _parameters
    ) ERC721("HoneyFarm Deposits v1", "HFD") {
        uint256 _startTime = _parameters[0];
        uint256 _endTime = _parameters[1];
        require(_endTime > _startTime, "HF: endTime before startTime");
        uint256 _totalHsfToDistribute = _parameters[2];
        uint256 _endDistributionFraction = _parameters[3];
        hsf = _hsf;
        startTime = _startTime;
        endTime = _endTime;
        _hsf.safeTransferFrom(msg.sender, address(this), _totalHsfToDistribute);

        /* check readme at github.com/1Hive/honeyswap-farm for a breakdown of
           the maths */
        // ds = (2 * s) / (te * (r + 1))
        uint256 startDistribution_ = _totalHsfToDistribute
            .mul(2)
            .mul(SCALE)
            .mul(SCALE)
            .div(
                (_endTime - _startTime).mul(_endDistributionFraction.add(SCALE))
            );
        // -m = ds * (1 - r) / te
        distributionSlope = startDistribution_
            .mul(SCALE.sub(_endDistributionFraction))
            .div((_endTime - _startTime).mul(SCALE));
        startDistribution = startDistribution_;

        uint256 _minTimeLock = _parameters[4];
        uint256 _maxTimeLock = _parameters[5];
        require(_minTimeLock < _maxTimeLock, "HF: invalid lock limits");
        minTimeLock = _minTimeLock;
        maxTimeLock = _maxTimeLock;
        timeLockMultiplier = _parameters[6];
        timeLockConstant = _parameters[7];
        downgradeFee = _parameters[8];
    }

    modifier notDisabled {
        require(contractDisabledAt == 0, "HF: Contract already disabled");
        _;
    }

    function poolLength() external view returns (uint256) {
        return pools.length();
    }

    function getPoolByIndex(uint256 _index)
        external
        view
        returns(
            IERC20 poolToken,
            uint256 allocation,
            uint256 lastRewardTimestamp,
            uint256 accHsfPerShare,
            uint256 totalShares
        )
    {
        poolToken = IERC20(pools.at(_index));
        PoolInfo storage pool = poolInfo[poolToken];
        allocation = pool.allocation;
        lastRewardTimestamp = pool.lastRewardTimestamp;
        accHsfPerShare = pool.accHsfPerShare;
        totalShares = pool.totalShares;
    }

    // underscore placed after to avoid collision with the ERC721._baseURI property
    function setBaseURI(string memory baseURI_) external override onlyOwner {
        _setBaseURI(baseURI_);
    }

    function disableContract(address _tokenRecipient)
        external override onlyOwner notDisabled
    {
        massUpdatePools();
        uint256 remainingTokens = getDistribution(block.timestamp, endTime);
        _safeHsfTransfer(_tokenRecipient, remainingTokens.div(SCALE));
        contractDisabledAt = block.timestamp;
        emit Disabled();
    }

    function depositAdditionalRewards(uint256 _depositAmount) external override {
        require(msg.sender == address(rewardManager), "HF: Only RM may add rewards");
        uint256 totalAllocationPoints_ = totalAllocationPoints;
        require(totalAllocationPoints_ > 0, "HF: no pools created");
        hsf.safeTransferFrom(msg.sender, address(this), _depositAmount);
        uint256 poolLen = pools.length();
        for (uint256 i; i < poolLen; i++) {
            IERC20 poolToken = IERC20(pools.at(i));
            PoolInfo storage pool = poolInfo[poolToken];
            uint256 poolTotalShares = pool.totalShares;
            if (poolTotalShares > 0) {
                uint256 poolScaledRewards = _depositAmount
                    .mul(SCALE)
                    .mul(pool.allocation)
                    / totalAllocationPoints_
                    / poolTotalShares;
                pool.accHsfPerShare = pool.accHsfPerShare.add(poolScaledRewards);
            }
        }
        emit RewardsAdded(_depositAmount);
    }

    // Add a new lp to the pool. Can only be called by the owner.
    function add(
        IERC20 _lpToken,
        uint256 _allocation
    ) public override onlyOwner notDisabled {
        require(
            address(rewardManager) != address(0),
            "HF: RewardManager not setup yet"
        );
        require(_allocation > 0, "HF: Too low allocation");
        massUpdatePools();
        require(pools.add(address(_lpToken)), "HF: LP pool already exists");
        uint256 lastRewardTimestamp = Math.max(block.timestamp, startTime);
        totalAllocationPoints = totalAllocationPoints.add(_allocation);
        poolInfo[_lpToken] = PoolInfo({
            allocation: _allocation,
            lastRewardTimestamp: lastRewardTimestamp,
            accHsfPerShare: 0,
            totalShares: 0
        });
        emit PoolAdded(_lpToken, _allocation);
    }

    // Update the given pool's allocation point. Can only be called by the owner.
    function set(
        IERC20 _poolToken,
        uint256 _allocation
    ) public override onlyOwner notDisabled {
        require(pools.contains(address(_poolToken)), "HF: Non-existant pool");
        massUpdatePools();
        totalAllocationPoints = totalAllocationPoints
            .sub(poolInfo[_poolToken].allocation)
            .add(_allocation);
        poolInfo[_poolToken].allocation = _allocation;
        emit PoolUpdated(_poolToken, _allocation);
        if (_allocation == 0) {
            pools.remove(address(_poolToken));
            emit PoolRemoved(_poolToken);
        }
    }

    // get tokens to be distributed between two timestamps scaled by SCALE
    function getDistribution(uint256 _from, uint256 _to)
        public
        view
        returns (uint256)
    {
        uint256 from = Math.max(startTime, _from);
        uint256 to = Math.min(_to, contractDisabledAt == 0 ? endTime : contractDisabledAt);

        if (from > to) return uint256(0);

        from = from.sub(startTime);
        to = to.sub(startTime);

        /* check readme at github.com/1Hive/honeyswap-farm for a breakdown of
           the maths */
        // d(t1, t2) = (t2 - t1) * (2 * ds - (-m) * (t2 + t1)) / 2
        return to.sub(from).mul(
            startDistribution.mul(2).sub(distributionSlope.mul(from.add(to)))
        ) / 2;
    }

    function getTimeMultiple(uint256 _unlockTime) public view returns(uint256) {
        if (_unlockTime == 0) return SCALE;
        uint256 timeDelta = _unlockTime.sub(block.timestamp);
        return timeDelta.mul(timeLockMultiplier).add(timeLockConstant);
    }

    // View function to see pending HSFs on frontend.
    function pendingHsf(uint256 _depositId)
        external
        view
        returns (uint256)
    {
        DepositInfo storage deposit = depositInfo[_depositId];
        PoolInfo storage pool = poolInfo[deposit.pool];
        return _getPendingHsf(deposit, pool);
    }

    // Deposit LP tokens into the farm to earn HSF
    function createDeposit(
        IERC20 _poolToken,
        uint256 _amount,
        uint256 _unlockTime,
        address _referrer
    )
        external notDisabled
    {
        require(_amount > 0, "HF: Must deposit something");
        require(
            _unlockTime == 0 || _unlockTime > block.timestamp,
            "HF: Invalid unlock time"
        );
        require(pools.contains(address(_poolToken)), "HF: Non-existant pool");
        if (_unlockTime != 0) {
            uint256 lockDuration = _unlockTime.sub(block.timestamp);
            require(minTimeLock <= lockDuration, "HF: Lock time too short");
            require(lockDuration <= maxTimeLock, "HF: Lock time exceeds maximum");
        }
        PoolInfo storage pool = poolInfo[_poolToken];
        updatePool(_poolToken);
        _poolToken.safeTransferFrom(
            address(msg.sender),
            address(this),
            _amount
        );
        uint256 newDepositId = totalDeposits++;
        DepositInfo storage newDeposit = depositInfo[newDepositId];
        newDeposit.amount = _amount;
        newDeposit.pool = _poolToken;
        newDeposit.referrer = _referrer;
        _resetRewardAccs(newDeposit, pool, _amount, _unlockTime);
        if (_referrer != address(0)) {
            emit Referred(_referrer, newDepositId);
        }
        _safeMint(msg.sender, newDepositId);
    }

    // Withdraw LP tokens from HoneyFarm along with reward
    function closeDeposit(uint256 _depositId) external {
        require(ownerOf(_depositId) == msg.sender, "HF: Must be owner to withdraw");
        DepositInfo storage deposit = depositInfo[_depositId];
        require(
            deposit.unlockTime == 0 ||
            deposit.unlockTime <= block.timestamp ||
            contractDisabledAt > 0,
            "HF: Deposit still locked"
        );
        IERC20 poolToken = deposit.pool;
        PoolInfo storage pool = poolInfo[poolToken];
        updatePool(poolToken);

        uint256 pending = _getPendingHsf(deposit, pool);
        pool.totalShares = pool.totalShares.sub(deposit.rewardShare);
        _burn(_depositId);
        _rewardReferrer(deposit.referrer, pending);
        _safeHsfTransfer(msg.sender, pending);
        poolToken.safeTransfer(msg.sender, deposit.amount);
        delete depositInfo[_depositId];
    }

    function setRewardManager(address _rewardManager) external override onlyOwner {
        require(address(rewardManager) == address(0), "HF: R already set");
        require(
            Ownable(_rewardManager).owner() == address(this),
            "HF: Not yet owner of HRP"
        );
        IRewardManager(_rewardManager).grantFundsAccess();
        rewardManager = IRewardManager(_rewardManager);
        emit RewardManagerSet(_rewardManager);
    }

    function withdrawRewards(uint256 _depositId) external {
        withdrawRewardsTo(msg.sender, _depositId);
    }

    function withdrawRewardsTo(address _recipient, uint256 _depositId) public {
        require(_isApprovedOrOwner(msg.sender, _depositId), "HF: Must be owner of deposit");
        DepositInfo storage deposit = depositInfo[_depositId];
        PoolInfo storage pool = poolInfo[deposit.pool];
        uint256 _unlockTime = deposit.unlockTime;
        if (_unlockTime > 0 && _unlockTime <= block.timestamp) {
            _downgradeExpired(_depositId);
        } else {
            updatePool(deposit.pool);
        }
        uint256 pendingRewards = _getPendingHsf(deposit, pool);
        deposit.setRewards = uint256(0);
        deposit.rewardDebt = deposit.rewardShare.mul(pool.accHsfPerShare).div(SCALE);
        _rewardReferrer(deposit.referrer, pendingRewards);
        _safeHsfTransfer(_recipient, pendingRewards);
        emit RewardsWithdraw(_depositId, pendingRewards);
    }

    function downgradeExpired(uint256 _depositId) public {
        DepositInfo storage deposit = depositInfo[_depositId];
        require(deposit.unlockTime > 0, "HF: no lock to expire");
        require(
            deposit.unlockTime <= block.timestamp,
            "HF: deposit has not expired yet"
        );
        _downgradeExpired(_depositId);
    }

    // Update reward variables for all pools. Be careful of gas spending!
    function massUpdatePools() public {
        uint256 length = pools.length();
        for (uint256 pid = 0; pid < length; pid++) {
            updatePool(IERC20(pools.at(pid)));
        }
    }

    // Update reward variables of the given pool to be up-to-date.
    function updatePool(IERC20 _poolToken) public {
        PoolInfo storage pool = poolInfo[_poolToken];
        if (block.timestamp <= pool.lastRewardTimestamp) {
            return;
        }
        uint256 totalShares = pool.totalShares;
        if (totalShares == 0) {
            pool.lastRewardTimestamp = block.timestamp;
            return;
        }
        uint256 dist = getDistribution(pool.lastRewardTimestamp, block.timestamp);
        uint256 hsfReward = dist.mul(pool.allocation).div(totalAllocationPoints);
        uint256 poolScaledRewards = hsfReward.div(totalShares);
        pool.accHsfPerShare = pool.accHsfPerShare.add(poolScaledRewards);
        pool.lastRewardTimestamp = block.timestamp;
    }

    function _rewardReferrer(address _referrer, uint256 _reward) internal {
        if (_referrer != address(0)) {
            rewardManager.distributeReward(_referrer, _reward);
        }
    }

    function _downgradeExpired(uint256 _depositId) internal {
        DepositInfo storage deposit = depositInfo[_depositId];
        IERC20 poolToken = deposit.pool;
        PoolInfo storage pool = poolInfo[poolToken];
        updatePool(poolToken);
        deposit.setRewards = _getPendingHsf(deposit, pool);
        uint256 amount = deposit.amount;
        _resetRewardAccs(deposit, pool, amount, 0);
        uint256 downgradeReward = amount.mul(downgradeFee).div(SCALE);
        poolToken.safeTransfer(msg.sender, downgradeReward);
        deposit.amount = amount.sub(downgradeReward);
        emit DepositDowngraded(msg.sender, _depositId, downgradeReward);
    }

    function _getPendingHsf(
        DepositInfo storage _deposit,
        PoolInfo storage _pool
    )
        internal
        view
        returns(uint256)
    {
        uint256 accHsfPerShare = _pool.accHsfPerShare;
        uint256 totalShares = _pool.totalShares;
        if (block.timestamp > _pool.lastRewardTimestamp && totalShares != 0) {
            uint256 dist = getDistribution(_pool.lastRewardTimestamp, block.timestamp);
            uint256 hsfReward = dist.mul(_pool.allocation).div(totalAllocationPoints);
            accHsfPerShare = accHsfPerShare.add(hsfReward.div(totalShares));
        }
        return _deposit.rewardShare.mul(accHsfPerShare).div(SCALE).sub(
            _deposit.rewardDebt
        ).add(_deposit.setRewards);
    }

    function _resetRewardAccs(
        DepositInfo storage _deposit,
        PoolInfo storage _pool,
        uint256 _amount,
        uint256 _unlockTime
    )
        internal
    {
        _deposit.unlockTime = _unlockTime;
        uint256 newShares = _amount.mul(getTimeMultiple(_unlockTime)).div(SCALE);
        _deposit.rewardDebt = newShares.mul(_pool.accHsfPerShare).div(SCALE);
        _pool.totalShares = _pool.totalShares.sub(_deposit.rewardShare).add(newShares);
        _deposit.rewardShare = newShares;
    }

    /* Safe hsf transfer function, just in case if rounding error causes pool
       to not have enough HSFs. */
    function _safeHsfTransfer(address _to, uint256 _amount) internal {
        uint256 hsfBal = hsf.balanceOf(address(this));
        hsf.safeTransfer(_to, Math.min(_amount, hsfBal));
    }
}

Contract Security Audit

Contract ABI

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IERC20","name":"_hsf","type":"address"},{"internalType":"uint256[9]","name":"_parameters","type":"uint256[9]"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"approved","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":false,"internalType":"bool","name":"approved","type":"bool"}],"name":"ApprovalForAll","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"downgrader","type":"address"},{"indexed":true,"internalType":"uint256","name":"depositId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"downgradeReward","type":"uint256"}],"name":"DepositDowngraded","type":"event"},{"anonymous":false,"inputs":[],"name":"Disabled","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":"contract IERC20","name":"poolToken","type":"address"},{"indexed":false,"internalType":"uint256","name":"allocation","type":"uint256"}],"name":"PoolAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"contract IERC20","name":"poolToken","type":"address"}],"name":"PoolRemoved","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"contract 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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

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

-----Decoded View---------------
Arg [0] : _hsf (address): 0x37d1ebc3af809b8fadb45dce7077efc629b2b5bb
Arg [1] : _parameters (uint256[9]): 1625140800,1688212800,891089108910891089108910,250000000000000000,86400,10368000,96450617284,1000000000000000000,100000000000000

-----Encoded View---------------
10 Constructor Arguments found :
Arg [0] : 00000000000000000000000037d1ebc3af809b8fadb45dce7077efc629b2b5bb
Arg [1] : 0000000000000000000000000000000000000000000000000000000060ddae40
Arg [2] : 0000000000000000000000000000000000000000000000000000000064a01540
Arg [3] : 00000000000000000000000000000000000000000000bcb209924203e82d9fae
Arg [4] : 00000000000000000000000000000000000000000000000003782dace9d90000
Arg [5] : 0000000000000000000000000000000000000000000000000000000000015180
Arg [6] : 00000000000000000000000000000000000000000000000000000000009e3400
Arg [7] : 0000000000000000000000000000000000000000000000000000001674e79fc4
Arg [8] : 0000000000000000000000000000000000000000000000000de0b6b3a7640000
Arg [9] : 00000000000000000000000000000000000000000000000000005af3107a4000


Deployed ByteCode Sourcemap

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Swarm Source

ipfs://d8a69929d2087f0ac85681c9bee39dad29a0d1aa40ec52671ec01bf21338f25a
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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