Contract 0x0a27E910Aee974D05000e05eab8a4b8Ebd93D40C 1

 
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0x0de194a652f91e32531d7266274969bfaa2e8f3db8bdc553566afbe1e724ef3cWithdraw152936022022-08-07 6:40:564 days 11 hrs ago0x4694f9c29fcb742e46b8cd1bc4589d04f7724a23 IN  Vesper Finance: vLINK Pool0 Ether0.‍00096509 3.‍50052351
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0x5da5b91431ec383c20db87c1ea7ccf4b0784c908e72cbda9033ff3d2b3dcb6d2Withdraw151328912022-07-13 7:12:4029 days 10 hrs ago0xe4e75e91a1b37c6e33d131879a61e1cfb6f98536 IN  Vesper Finance: vLINK Pool0 Ether0.‍00780175 17.‍94764237
0x807d645cb928f4d76d5c9800b45f47334057c193fd0f82684bd026316d419f1aWithdraw151264462022-07-12 7:11:0030 days 10 hrs ago0xa7b635c8b9c3c5dc3bf627d1be337aeb8e23ffda IN  Vesper Finance: vLINK Pool0 Ether0.‍00477988 10.‍99594853
0xcb4ccbeabcfc05bdc88f421db3cd8c4fea8c7e4985f2a4851c916152f7db14e6Withdraw151039712022-07-08 19:56:2933 days 22 hrs ago0xbbf569aed947741224d36168f859bb9263cc6bf4 IN  Vesper Finance: vLINK Pool0 Ether0.‍01388365 30.‍48706956
0x458b813c290eb62cb8ed942276288fe997ddeb0ca7bc0ce5f7a3c0a562556bfbWithdraw151011732022-07-08 9:48:3734 days 8 hrs ago0xe8bde08a933dc0744c3a9dca7d0f1c3978c2be90 IN  Vesper Finance: vLINK Pool0 Ether0.‍00398701 15.‍75796774
0x0db63ad7766659fe4fec9630a2a9d8b600e759c1c1ef4956b09714db73204456Withdraw150422822022-06-29 0:03:4543 days 18 hrs ago0xeb5c56c9a02c311cc8cad7a1a666e143f63fd88a IN  Vesper Finance: vLINK Pool0 Ether0.‍01434379 37.‍30331606
0x789de87d33c082e6f3c694867ba1d410c87072795f62dbe99782d7fcec59ca39Withdraw149815602022-06-17 22:15:3154 days 19 hrs ago0x12ba8f816dbb909c7823fc39f6ad6851507ebb73 IN  Vesper Finance: vLINK Pool0 Ether0.‍01315018 35.‍25349267
0x628f04488ce2d0f6e6dcd01b0ecc858fffe09637605941402e808086f787ffc3Withdraw149767472022-06-17 2:33:0855 days 15 hrs ago0xe014ba63a084fefa1720b38d20f225b259d35ffc IN  Vesper Finance: vLINK Pool0 Ether0.‍01322127 35.‍98310594
0x645f520ecbeea699afcad94684ef8be0d96bfdb9b5975560108f3906c7c39a38Withdraw149636412022-06-14 20:22:5357 days 21 hrs ago0xb67063006f3089dc4d5a41db846eec5cdd54b878 IN  Vesper Finance: vLINK Pool0 Ether0.‍03135953 85.‍3511094
0x6052eb69ea35a9726244969c1445e8b30808368be73eaecf9fd244c51fc15a6bWithdraw149523662022-06-12 21:28:0059 days 20 hrs agoENS Name xxmikecheckxx.eth IN  Vesper Finance: vLINK Pool0 Ether0.‍01071092 29.‍15186724
0xff879a699282fe010a53c78bc4485ab7eff925ef77d023bfe270c13fed756203Withdraw149348402022-06-09 21:46:4362 days 20 hrs ago0xf4e0940fc5b54acc6fd23372050360aaa6197242 IN  Vesper Finance: vLINK Pool0 Ether0.‍01983429 48.‍70682771
0x3321525aa92f204d2d4a98df99409901d876572a882249063465a04abc0a3308Withdraw149080322022-06-05 8:18:3167 days 9 hrs ago0x2e2e066432ba88688c83d9f62e8e5e0e25646a5d IN  Vesper Finance: vLINK Pool0 Ether0.‍00971966 24.‍91467395
0xbdf98c3e1c4d098b1cd4234c77653c112685931bdac497caae0f154dbeca89f0Withdraw148672632022-05-29 15:36:4674 days 2 hrs ago0x7823af124f0d8da43f60e280ec111e16acc0a3c4 IN  Vesper Finance: vLINK Pool0 Ether0.‍0077188 20.‍07397428
0xb33df45678225ade78a5763bab51c012216eb2d340ef015368c6a1bb7def7affWithdraw148418862022-05-25 12:30:3578 days 5 hrs ago0x7f0552c8a225b9f62c4500f3e878386425da1324 IN  Vesper Finance: vLINK Pool0 Ether0.‍00860304 25.‍81807971
0xa33f3a3342ec6a6a1d07c2a92ebd77b68d35fec1960ff27acfe6f0b931a44071Withdraw148411632022-05-25 9:43:5278 days 8 hrs agoENS Name diogor.eth IN  Vesper Finance: vLINK Pool0 Ether0.‍00673444 17.‍26258068
0xb41c234117e09faedd7114d04e733180e08189dd823386d46fb8a065ca48eba0Withdraw148352212022-05-24 10:25:0079 days 7 hrs agoENS Name oriolbcn.eth IN  Vesper Finance: vLINK Pool0 Ether0.‍00724359 17.‍07113576
0x98d4e759086bfb13820a25033ed4f52f206eccc5b876ff1d26c1a4f95c77b52fWithdraw148080592022-05-20 0:34:1383 days 17 hrs ago0x448de75c8f9d03ae1884dea50c39c53c7f5fa874 IN  Vesper Finance: vLINK Pool0 Ether0.‍00670537 17.‍18807016
0x8218a4e558d16c8a1d2a9a96fb3163e201952d1bf2877441471768fc9fed8e71Withdraw147824442022-05-15 21:49:4487 days 20 hrs ago0x486dc406987459faeced71edd26d9f38a0ab5b82 IN  Vesper Finance: vLINK Pool0 Ether0.‍00512412 13.‍32608882
0xe4a5074f98114295bb02ed86b4c6b58cc9f2867d7cf0a587762f97c87573f2b5Withdraw147779962022-05-15 4:50:0388 days 13 hrs ago0x0ee0c544adf3093e9d4d056d7e6aa802ad17d0ab IN  Vesper Finance: vLINK Pool0 Ether0.‍00573591 15.‍37654691
0x91879d3ec50feea21b8b20e751143d758e083bc376b0092be327f830f0206d29Withdraw147746162022-05-14 16:20:0989 days 1 hr agoENS Name johnduffy.eth IN  Vesper Finance: vLINK Pool0 Ether0.‍01870977 52.‍56765646
0x024da0fda7d39c996b75312c9fd0560839809bc3f6e203321dc01a336d228c0eWithdraw147636462022-05-12 22:14:3290 days 19 hrs ago0x24c5907cf8104ab5efeec7fab3cb19dc8907adae IN  Vesper Finance: vLINK Pool0 Ether0.‍04542982 111.‍56144189
0x3ca4b5850f8b40edd09c3020f4ffd781b9cc2177fb99b4cdf799c77277fb2263Withdraw147597182022-05-12 7:04:2991 days 11 hrs ago0x18addb4b0ea01ad018417d7de4e37b9b6d35c734 IN  Vesper Finance: vLINK Pool0 Ether0.‍2183693 536.‍23089925
0xad03b5e50372c37f68ea2a428031b2c8d449f9d629939d118d627135e7e57018Withdraw147097102022-05-04 7:54:4099 days 10 hrs ago0x8fa081edc8a546365bca41583c35fed86a8e574e IN  Vesper Finance: vLINK Pool0 Ether0.‍01824862 44.‍81291023
0x10d3423d3214bc2d5f7124fd09353dae89eec36b7cd97ff22cea2da9008ce2edWithdraw146601122022-04-26 12:18:55107 days 5 hrs agoENS Name xxxxizzy.eth IN  Vesper Finance: vLINK Pool0 Ether0.‍00899994 24.‍12738496
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Contract Source Code Verified (Exact Match)

Contract Name:
VLINK

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2021-03-31
*/

// SPDX-License-Identifier: MIT

// File: @openzeppelin/contracts/GSN/Context.sol

pragma solidity ^0.6.0;

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

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

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol

pragma solidity ^0.6.0;

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

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/math/SafeMath.sol



pragma solidity ^0.6.0;

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

        return c;
    }

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

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

        return c;
    }

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

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

        return c;
    }

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

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

        return c;
    }

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

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

// File: @openzeppelin/contracts/utils/Address.sol



pragma solidity ^0.6.2;

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

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

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

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

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/token/ERC20/ERC20.sol



pragma solidity ^0.6.0;





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

    mapping (address => uint256) private _balances;

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

    uint256 private _totalSupply;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

        _beforeTokenTransfer(sender, recipient, amount);

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

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

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

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

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol



pragma solidity ^0.6.0;




/**
 * @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/utils/ReentrancyGuard.sol



pragma solidity ^0.6.0;

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

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

    uint256 private _status;

    constructor () internal {
        _status = _NOT_ENTERED;
    }

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

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

        _;

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

// File: contracts/Pausable.sol



pragma solidity 0.6.12;


/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 */
contract Pausable is Context {
    event Paused(address account);
    event Shutdown(address account);
    event Unpaused(address account);
    event Open(address account);

    bool public paused;
    bool public stopEverything;

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

    modifier whenNotShutdown() {
        require(!stopEverything, "Pausable: shutdown");
        _;
    }

    modifier whenShutdown() {
        require(stopEverything, "Pausable: not shutdown");
        _;
    }

    /// @dev Pause contract operations, if contract is not paused.
    function _pause() internal virtual whenNotPaused {
        paused = true;
        emit Paused(_msgSender());
    }

    /// @dev Unpause contract operations, allow only if contract is paused and not shutdown.
    function _unpause() internal virtual whenPaused whenNotShutdown {
        paused = false;
        emit Unpaused(_msgSender());
    }

    /// @dev Shutdown contract operations, if not already shutdown.
    function _shutdown() internal virtual whenNotShutdown {
        stopEverything = true;
        paused = true;
        emit Shutdown(_msgSender());
    }

    /// @dev Open contract operations, if contract is in shutdown state
    function _open() internal virtual whenShutdown {
        stopEverything = false;
        emit Open(_msgSender());
    }
}

// File: contracts/interfaces/vesper/IController.sol



pragma solidity 0.6.12;

interface IController {
    function aaveReferralCode() external view returns (uint16);

    function feeCollector(address) external view returns (address);

    function founderFee() external view returns (uint256);

    function founderVault() external view returns (address);

    function interestFee(address) external view returns (uint256);

    function isPool(address) external view returns (bool);

    function pools() external view returns (address);

    function strategy(address) external view returns (address);

    function rebalanceFriction(address) external view returns (uint256);

    function poolRewards(address) external view returns (address);

    function treasuryPool() external view returns (address);

    function uniswapRouter() external view returns (address);

    function withdrawFee(address) external view returns (uint256);
}

// File: contracts/interfaces/vesper/IVesperPool.sol



pragma solidity 0.6.12;


interface IVesperPool is IERC20 {
    function approveToken() external;

    function deposit() external payable;

    function deposit(uint256) external;

    function multiTransfer(uint256[] memory) external returns (bool);

    function permit(
        address,
        address,
        uint256,
        uint256,
        uint8,
        bytes32,
        bytes32
    ) external;

    function rebalance() external;

    function resetApproval() external;

    function sweepErc20(address) external;

    function withdraw(uint256) external;

    function withdrawETH(uint256) external;

    function withdrawByStrategy(uint256) external;

    function feeCollector() external view returns (address);

    function getPricePerShare() external view returns (uint256);

    function token() external view returns (address);

    function tokensHere() external view returns (uint256);

    function totalValue() external view returns (uint256);

    function withdrawFee() external view returns (uint256);
}

// File: contracts/interfaces/vesper/IPoolRewards.sol



pragma solidity 0.6.12;

interface IPoolRewards {
    function notifyRewardAmount(uint256) external;

    function claimReward(address) external;

    function updateReward(address) external;

    function rewardForDuration() external view returns (uint256);

    function claimable(address) external view returns (uint256);

    function pool() external view returns (address);

    function lastTimeRewardApplicable() external view returns (uint256);

    function rewardPerToken() external view returns (uint256);
}

// File: sol-address-list/contracts/interfaces/IAddressList.sol



pragma solidity ^0.6.6;

interface IAddressList {
    event AddressUpdated(address indexed a, address indexed sender);
    event AddressRemoved(address indexed a, address indexed sender);

    function add(address a) external returns (bool);

    function addValue(address a, uint256 v) external returns (bool);

    function addMulti(address[] calldata addrs) external returns (uint256);

    function addValueMulti(address[] calldata addrs, uint256[] calldata values) external returns (uint256);

    function remove(address a) external returns (bool);

    function removeMulti(address[] calldata addrs) external returns (uint256);

    function get(address a) external view returns (uint256);

    function contains(address a) external view returns (bool);

    function at(uint256 index) external view returns (address, uint256);

    function length() external view returns (uint256);
}

// File: sol-address-list/contracts/interfaces/IAddressListExt.sol



pragma solidity ^0.6.6;


interface IAddressListExt is IAddressList {
    function hasRole(bytes32 role, address account) external view returns (bool);

    function getRoleMemberCount(bytes32 role) external view returns (uint256);

    function getRoleMember(bytes32 role, uint256 index) external view returns (address);

    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    function grantRole(bytes32 role, address account) external;

    function revokeRole(bytes32 role, address account) external;

    function renounceRole(bytes32 role, address account) external;
}

// File: sol-address-list/contracts/interfaces/IAddressListFactory.sol



pragma solidity ^0.6.6;

interface IAddressListFactory {
    event ListCreated(address indexed _sender, address indexed _newList);

    function ours(address a) external view returns (bool);

    function listCount() external view returns (uint256);

    function listAt(uint256 idx) external view returns (address);

    function createList() external returns (address listaddr);
}

// File: contracts/pools/PoolShareToken.sol



pragma solidity 0.6.12;










/// @title Holding pool share token
// solhint-disable no-empty-blocks
abstract contract PoolShareToken is ERC20, Pausable, ReentrancyGuard {
    using SafeERC20 for IERC20;
    IERC20 public immutable token;
    IAddressListExt public immutable feeWhiteList;
    IController public immutable controller;

    /// @dev The EIP-712 typehash for the contract's domain
    bytes32 public constant DOMAIN_TYPEHASH =
        keccak256(
            "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
        );

    /// @dev The EIP-712 typehash for the permit struct used by the contract
    bytes32 public constant PERMIT_TYPEHASH =
        keccak256(
            "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
        );

    bytes32 public immutable domainSeparator;

    uint256 internal constant MAX_UINT_VALUE = uint256(-1);
    mapping(address => uint256) public nonces;
    event Deposit(address indexed owner, uint256 shares, uint256 amount);
    event Withdraw(address indexed owner, uint256 shares, uint256 amount);

    constructor(
        string memory _name,
        string memory _symbol,
        address _token,
        address _controller
    ) public ERC20(_name, _symbol) {
        uint256 chainId;
        assembly {
            chainId := chainid()
        }
        token = IERC20(_token);
        controller = IController(_controller);
        IAddressListFactory factory =
            IAddressListFactory(0xD57b41649f822C51a73C44Ba0B3da4A880aF0029);
        IAddressListExt _feeWhiteList = IAddressListExt(factory.createList());
        _feeWhiteList.grantRole(keccak256("LIST_ADMIN"), _controller);
        feeWhiteList = _feeWhiteList;
        domainSeparator = keccak256(
            abi.encode(
                DOMAIN_TYPEHASH,
                keccak256(bytes(_name)),
                keccak256(bytes("1")),
                chainId,
                address(this)
            )
        );
    }

    /**
     * @notice Deposit ERC20 tokens and receive pool shares depending on the current share price.
     * @param amount ERC20 token amount.
     */
    function deposit(uint256 amount) external virtual nonReentrant whenNotPaused {
        _deposit(amount);
    }

    /**
     * @notice Deposit ERC20 tokens with permit aka gasless approval.
     * @param amount ERC20 token amount.
     * @param deadline The time at which signature will expire
     * @param v The recovery byte of the signature
     * @param r Half of the ECDSA signature pair
     * @param s Half of the ECDSA signature pair
     */
    function depositWithPermit(
        uint256 amount,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external virtual nonReentrant whenNotPaused {
        IVesperPool(address(token)).permit(_msgSender(), address(this), amount, deadline, v, r, s);
        _deposit(amount);
    }

    /**
     * @notice Withdraw collateral based on given shares and the current share price.
     * Transfer earned rewards to caller. Withdraw fee, if any, will be deduced from
     * given shares and transferred to feeCollector. Burn remaining shares and return collateral.
     * @param shares Pool shares. It will be in 18 decimals.
     */
    function withdraw(uint256 shares) external virtual nonReentrant whenNotShutdown {
        _withdraw(shares);
    }

    /**
     * @notice Withdraw collateral based on given shares and the current share price.
     * Transfer earned rewards to caller. Burn shares and return collateral.
     * @dev No withdraw fee will be assessed when this function is called.
     * Only some white listed address can call this function.
     * @param shares Pool shares. It will be in 18 decimals.
     */
    function withdrawByStrategy(uint256 shares) external virtual nonReentrant whenNotShutdown {
        require(feeWhiteList.get(_msgSender()) != 0, "Not a white listed address");
        _withdrawByStrategy(shares);
    }

    /**
     * @notice Transfer tokens to multiple recipient
     * @dev Left 160 bits are the recipient address and the right 96 bits are the token amount.
     * @param bits array of uint
     * @return true/false
     */
    function multiTransfer(uint256[] memory bits) external returns (bool) {
        for (uint256 i = 0; i < bits.length; i++) {
            address a = address(bits[i] >> 96);
            uint256 amount = bits[i] & ((1 << 96) - 1);
            require(transfer(a, amount), "Transfer failed");
        }
        return true;
    }

    /**
     * @notice Triggers an approval from owner to spends
     * @param owner The address to approve from
     * @param spender The address to be approved
     * @param amount The number of tokens that are approved (2^256-1 means infinite)
     * @param deadline The time at which to expire the signature
     * @param v The recovery byte of the signature
     * @param r Half of the ECDSA signature pair
     * @param s Half of the ECDSA signature pair
     */
    function permit(
        address owner,
        address spender,
        uint256 amount,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external {
        require(deadline >= block.timestamp, "Expired");
        bytes32 digest =
            keccak256(
                abi.encodePacked(
                    "\x19\x01",
                    domainSeparator,
                    keccak256(
                        abi.encode(
                            PERMIT_TYPEHASH,
                            owner,
                            spender,
                            amount,
                            nonces[owner]++,
                            deadline
                        )
                    )
                )
            );
        address signatory = ecrecover(digest, v, r, s);
        require(signatory != address(0) && signatory == owner, "Invalid signature");
        _approve(owner, spender, amount);
    }

    /**
     * @notice Get price per share
     * @dev Return value will be in token defined decimals.
     */
    function getPricePerShare() external view returns (uint256) {
        if (totalSupply() == 0) {
            return convertFrom18(1e18);
        }
        return totalValue().mul(1e18).div(totalSupply());
    }

    /// @dev Convert to 18 decimals from token defined decimals. Default no conversion.
    function convertTo18(uint256 amount) public pure virtual returns (uint256) {
        return amount;
    }

    /// @dev Convert from 18 decimals to token defined decimals. Default no conversion.
    function convertFrom18(uint256 amount) public pure virtual returns (uint256) {
        return amount;
    }

    /// @dev Get fee collector address
    function feeCollector() public view virtual returns (address) {
        return controller.feeCollector(address(this));
    }

    /// @dev Returns the token stored in the pool. It will be in token defined decimals.
    function tokensHere() public view virtual returns (uint256) {
        return token.balanceOf(address(this));
    }

    /**
     * @dev Returns sum of token locked in other contracts and token stored in the pool.
     * Default tokensHere. It will be in token defined decimals.
     */
    function totalValue() public view virtual returns (uint256) {
        return tokensHere();
    }

    /**
     * @notice Get withdraw fee for this pool
     * @dev Format: 1e16 = 1% fee
     */
    function withdrawFee() public view virtual returns (uint256) {
        return controller.withdrawFee(address(this));
    }

    /**
     * @dev Hook that is called just before burning tokens. To be used i.e. if
     * collateral is stored in a different contract and needs to be withdrawn.
     * @param share Pool share in 18 decimals
     */
    function _beforeBurning(uint256 share) internal virtual {}

    /**
     * @dev Hook that is called just after burning tokens. To be used i.e. if
     * collateral stored in a different/this contract needs to be transferred.
     * @param amount Collateral amount in collateral token defined decimals.
     */
    function _afterBurning(uint256 amount) internal virtual {}

    /**
     * @dev Hook that is called just before minting new tokens. To be used i.e.
     * if the deposited amount is to be transferred from user to this contract.
     * @param amount Collateral amount in collateral token defined decimals.
     */
    function _beforeMinting(uint256 amount) internal virtual {}

    /**
     * @dev Hook that is called just after minting new tokens. To be used i.e.
     * if the deposited amount is to be transferred to a different contract.
     * @param amount Collateral amount in collateral token defined decimals.
     */
    function _afterMinting(uint256 amount) internal virtual {}

    /**
     * @dev Calculate shares to mint based on the current share price and given amount.
     * @param amount Collateral amount in collateral token defined decimals.
     */
    function _calculateShares(uint256 amount) internal view returns (uint256) {
        require(amount != 0, "amount is 0");

        uint256 _totalSupply = totalSupply();
        uint256 _totalValue = convertTo18(totalValue());
        uint256 shares =
            (_totalSupply == 0 || _totalValue == 0)
                ? amount
                : amount.mul(_totalSupply).div(_totalValue);
        return shares;
    }

    /// @dev Deposit incoming token and mint pool token i.e. shares.
    function _deposit(uint256 amount) internal whenNotPaused {
        uint256 shares = _calculateShares(convertTo18(amount));
        _beforeMinting(amount);
        _mint(_msgSender(), shares);
        _afterMinting(amount);
        emit Deposit(_msgSender(), shares, amount);
    }

    /// @dev Handle withdraw fee calculation and fee transfer to fee collector.
    function _handleFee(uint256 shares) internal returns (uint256 _sharesAfterFee) {
        if (withdrawFee() != 0) {
            uint256 _fee = shares.mul(withdrawFee()).div(1e18);
            _sharesAfterFee = shares.sub(_fee);
            _transfer(_msgSender(), feeCollector(), _fee);
        } else {
            _sharesAfterFee = shares;
        }
    }

    /// @dev Update pool reward of sender and receiver before transfer.
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 /* amount */
    ) internal virtual override {
        address poolRewards = controller.poolRewards(address(this));
        if (poolRewards != address(0)) {
            if (from != address(0)) {
                IPoolRewards(poolRewards).updateReward(from);
            }
            if (to != address(0)) {
                IPoolRewards(poolRewards).updateReward(to);
            }
        }
    }

    /// @dev Burns shares and returns the collateral value, after fee, of those.
    function _withdraw(uint256 shares) internal whenNotShutdown {
        require(shares != 0, "share is 0");
        _beforeBurning(shares);
        uint256 sharesAfterFee = _handleFee(shares);
        uint256 amount =
            convertFrom18(sharesAfterFee.mul(convertTo18(totalValue())).div(totalSupply()));

        _burn(_msgSender(), sharesAfterFee);
        _afterBurning(amount);
        emit Withdraw(_msgSender(), shares, amount);
    }

    /// @dev Burns shares and returns the collateral value of those.
    function _withdrawByStrategy(uint256 shares) internal {
        require(shares != 0, "Withdraw must be greater than 0");
        _beforeBurning(shares);
        uint256 amount = convertFrom18(shares.mul(convertTo18(totalValue())).div(totalSupply()));
        _burn(_msgSender(), shares);
        _afterBurning(amount);
        emit Withdraw(_msgSender(), shares, amount);
    }
}

// File: contracts/interfaces/uniswap/IUniswapV2Router01.sol



pragma solidity 0.6.12;

interface IUniswapV2Router01 {
    function factory() external pure returns (address);

    function swapExactTokensForTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapTokensForExactTokens(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapExactETHForTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);

    function swapTokensForExactETH(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapExactTokensForETH(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapETHForExactTokens(
        uint256 amountOut,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);

    function quote(
        uint256 amountA,
        uint256 reserveA,
        uint256 reserveB
    ) external pure returns (uint256 amountB);

    function getAmountOut(
        uint256 amountIn,
        uint256 reserveIn,
        uint256 reserveOut
    ) external pure returns (uint256 amountOut);

    function getAmountIn(
        uint256 amountOut,
        uint256 reserveIn,
        uint256 reserveOut
    ) external pure returns (uint256 amountIn);

    function getAmountsOut(uint256 amountIn, address[] calldata path)
        external
        view
        returns (uint256[] memory amounts);

    function getAmountsIn(uint256 amountOut, address[] calldata path)
        external
        view
        returns (uint256[] memory amounts);
}

// File: contracts/interfaces/uniswap/IUniswapV2Router02.sol



pragma solidity 0.6.12;


interface IUniswapV2Router02 is IUniswapV2Router01 {
    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}

// File: contracts/interfaces/vesper/IStrategy.sol



pragma solidity 0.6.12;

interface IStrategy {
    function rebalance() external;

    function deposit(uint256 amount) external;

    function beforeWithdraw() external;

    function withdraw(uint256 amount) external;

    function withdrawAll() external;

    function isUpgradable() external view returns (bool);

    function isReservedToken(address _token) external view returns (bool);

    function token() external view returns (address);

    function pool() external view returns (address);

    function totalLocked() external view returns (uint256);

    //Lifecycle functions
    function pause() external;

    function unpause() external;
}

// File: contracts/pools/VTokenBase.sol



pragma solidity 0.6.12;




abstract contract VTokenBase is PoolShareToken {
    address internal constant WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;

    constructor(
        string memory name,
        string memory symbol,
        address _token,
        address _controller
    ) public PoolShareToken(name, symbol, _token, _controller) {
        require(_controller != address(0), "Controller address is zero");
    }

    modifier onlyController() {
        require(address(controller) == _msgSender(), "Caller is not the controller");
        _;
    }

    function pause() external onlyController {
        _pause();
    }

    function unpause() external onlyController {
        _unpause();
    }

    function shutdown() external onlyController {
        _shutdown();
    }

    function open() external onlyController {
        _open();
    }

    /// @dev Approve strategy to spend collateral token and strategy token of pool.
    function approveToken() external virtual onlyController {
        address strategy = controller.strategy(address(this));
        token.safeApprove(strategy, MAX_UINT_VALUE);
        IERC20(IStrategy(strategy).token()).safeApprove(strategy, MAX_UINT_VALUE);
    }

    /// @dev Reset token approval of strategy. Called when updating strategy.
    function resetApproval() external virtual onlyController {
        address strategy = controller.strategy(address(this));
        token.safeApprove(strategy, 0);
        IERC20(IStrategy(strategy).token()).safeApprove(strategy, 0);
    }

    /**
     * @dev Rebalance invested collateral to mitigate liquidation risk, if any.
     * Behavior of rebalance is driven by risk parameters defined in strategy.
     */
    function rebalance() external virtual {
        IStrategy strategy = IStrategy(controller.strategy(address(this)));
        strategy.rebalance();
    }

    /**
     * @dev Convert given ERC20 token into collateral token via Uniswap
     * @param _erc20 Token address
     */
    function sweepErc20(address _erc20) external virtual {
        _sweepErc20(_erc20);
    }

    /// @dev Returns collateral token locked in strategy
    function tokenLocked() public view virtual returns (uint256) {
        IStrategy strategy = IStrategy(controller.strategy(address(this)));
        return strategy.totalLocked();
    }

    /// @dev Returns total value of vesper pool, in terms of collateral token
    function totalValue() public view override returns (uint256) {
        return tokenLocked().add(tokensHere());
    }

    /**
     * @dev After burning hook, it will be called during withdrawal process.
     * It will withdraw collateral from strategy and transfer it to user.
     */
    function _afterBurning(uint256 _amount) internal override {
        uint256 balanceHere = tokensHere();
        if (balanceHere < _amount) {
            _withdrawCollateral(_amount.sub(balanceHere));
            balanceHere = tokensHere();
            _amount = balanceHere < _amount ? balanceHere : _amount;
        }
        token.safeTransfer(_msgSender(), _amount);
    }

    /**
     * @dev Before burning hook.
     * Some actions, like resurface(), can impact share price and has to be called before withdraw.
     */
    function _beforeBurning(
        uint256 /* shares */
    ) internal override {
        IStrategy strategy = IStrategy(controller.strategy(address(this)));
        strategy.beforeWithdraw();
    }

    function _beforeMinting(uint256 amount) internal override {
        token.safeTransferFrom(_msgSender(), address(this), amount);
    }

    function _withdrawCollateral(uint256 amount) internal virtual {
        IStrategy strategy = IStrategy(controller.strategy(address(this)));
        strategy.withdraw(amount);
    }

    function _sweepErc20(address _from) internal {
        IStrategy strategy = IStrategy(controller.strategy(address(this)));
        require(
            _from != address(token) && _from != address(this) && !strategy.isReservedToken(_from),
            "Not allowed to sweep"
        );
        IUniswapV2Router02 uniswapRouter = IUniswapV2Router02(controller.uniswapRouter());
        uint256 amt = IERC20(_from).balanceOf(address(this));
        IERC20(_from).safeApprove(address(uniswapRouter), 0);
        IERC20(_from).safeApprove(address(uniswapRouter), amt);
        address[] memory path;
        if (address(token) == WETH) {
            path = new address[](2);
            path[0] = _from;
            path[1] = address(token);
        } else {
            path = new address[](3);
            path[0] = _from;
            path[1] = WETH;
            path[2] = address(token);
        }
        uniswapRouter.swapExactTokensForTokens(amt, 1, path, address(this), now + 30);
    }
}

// File: contracts/pools/VLINK.sol



pragma solidity 0.6.12;


//solhint-disable no-empty-blocks
contract VLINK is VTokenBase {
    constructor(address _controller)
        public
        VTokenBase("vLINK Pool", "vLINK", 0x514910771AF9Ca656af840dff83E8264EcF986CA, _controller)
    {}
}

Contract Security Audit

Contract ABI

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

000000000000000000000000a4f1671d3aee73c05b552d57f2d16d3cfcbd0217

-----Decoded View---------------
Arg [0] : _controller (address): 0xa4f1671d3aee73c05b552d57f2d16d3cfcbd0217

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000a4f1671d3aee73c05b552d57f2d16d3cfcbd0217


Deployed ByteCode Sourcemap

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Swarm Source

ipfs://81fe5bc2e35a760b7f94bc1539af5866d55b6e5de89ec1822e59a695f1e5a04c
Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.