@levxdao/ve/deployments/mainnet/solcInputs/e47e3caa7a97fd9ed213c8c8516f216a.json

VE and Gauge Voting for NFTs

{
  "language": "Solidity",
  "sources": {
    "contracts/BoostedVotingEscrowDelegate.sol": {
      "content": "// SPDX-License-Identifier: UNLICENSED\npragma solidity ^0.8.14;\n\nimport \"./VotingEscrowDelegate.sol\";\n\ncontract BoostedVotingEscrowDelegate is VotingEscrowDelegate {\n    uint256 public immutable minDuration;\n    uint256 public immutable maxBoost;\n    uint256 public immutable deadline;\n\n    constructor(\n        address _ve,\n        address _token,\n        address _discountToken,\n        uint256 _minDuration,\n        uint256 _maxBoost,\n        uint256 _deadline\n    ) VotingEscrowDelegate(_ve, _token, _discountToken) {\n        minDuration = _minDuration;\n        maxBoost = _maxBoost;\n        deadline = _deadline;\n    }\n\n    function _createLock(\n        uint256 amountToken,\n        uint256 duration,\n        bool discounted\n    ) internal override {\n        require(block.timestamp < deadline, \"BVED: EXPIRED\");\n        require(duration >= minDuration, \"BVED: DURATION_TOO_SHORT\");\n\n        super._createLock(amountToken, duration, discounted);\n    }\n\n    function _increaseAmount(uint256 amountToken, bool discounted) internal override {\n        require(block.timestamp < deadline, \"BVED: EXPIRED\");\n\n        super._increaseAmount(amountToken, discounted);\n    }\n\n    function _getAmounts(uint256 amount, uint256 duration)\n        internal\n        view\n        override\n        returns (uint256 amountVE, uint256 amountToken)\n    {\n        amountVE = (amount * maxBoost * duration) / _maxDuration;\n        amountToken = amount;\n    }\n}\n"
    },
    "contracts/VotingEscrowDelegate.sol": {
      "content": "// SPDX-License-Identifier: UNLICENSED\npragma solidity ^0.8.14;\n\nimport \"./interfaces/IVotingEscrowDelegate.sol\";\nimport \"./interfaces/IVotingEscrow.sol\";\nimport \"./interfaces/INFT.sol\";\n\nabstract contract VotingEscrowDelegate is IVotingEscrowDelegate {\n    address public immutable ve;\n    address public immutable token;\n    address public immutable discountToken;\n\n    uint256 internal immutable _maxDuration;\n    uint256 internal immutable _interval;\n\n    event CreateLock(address indexed account, uint256 amount, uint256 discount, uint256 indexed locktime);\n    event IncreaseAmount(address indexed account, uint256 amount, uint256 discount);\n\n    constructor(\n        address _ve,\n        address _token,\n        address _discountToken\n    ) {\n        ve = _ve;\n        token = _token;\n        discountToken = _discountToken;\n\n        _maxDuration = IVotingEscrow(_ve).maxDuration();\n        _interval = IVotingEscrow(ve).interval();\n    }\n\n    modifier eligibleForDiscount {\n        require(INFT(discountToken).balanceOf(msg.sender) > 0, \"VED: DISCOUNT_TOKEN_NOT_OWNED\");\n        _;\n    }\n\n    function createLockDiscounted(uint256 amount, uint256 duration) external eligibleForDiscount {\n        _createLock(amount, duration, true);\n    }\n\n    function createLock(uint256 amount, uint256 duration) external {\n        _createLock(amount, duration, false);\n    }\n\n    function _createLock(\n        uint256 amount,\n        uint256 duration,\n        bool discounted\n    ) internal virtual {\n        require(duration <= _maxDuration, \"VED: DURATION_TOO_LONG\");\n\n        uint256 unlockTime = ((block.timestamp + duration) / _interval) * _interval; // rounded down to a multiple of interval\n        uint256 _duration = unlockTime - block.timestamp;\n        (uint256 amountVE, uint256 amountToken) = _getAmounts(amount, _duration);\n        if (discounted) {\n            amountVE = (amountVE * 100) / 90;\n        }\n\n        emit CreateLock(msg.sender, amountVE, amountVE - amountToken, unlockTime);\n        IVotingEscrow(ve).createLockFor(msg.sender, amountVE, amountVE - amountToken, _duration);\n    }\n\n    function increaseAmountDiscounted(uint256 amount) external eligibleForDiscount {\n        _increaseAmount(amount, true);\n    }\n\n    function increaseAmount(uint256 amount) external {\n        _increaseAmount(amount, false);\n    }\n\n    function _increaseAmount(uint256 amount, bool discounted) internal virtual {\n        uint256 unlockTime = IVotingEscrow(ve).unlockTime(msg.sender);\n        require(unlockTime > 0, \"VED: LOCK_NOT_FOUND\");\n\n        (uint256 amountVE, uint256 amountToken) = _getAmounts(amount, unlockTime - block.timestamp);\n        if (discounted) {\n            amountVE = (amountVE * 100) / 90;\n        }\n\n        emit IncreaseAmount(msg.sender, amountVE, amountVE - amountToken);\n        IVotingEscrow(ve).increaseAmountFor(msg.sender, amountVE, amountVE - amountToken);\n    }\n\n    function _getAmounts(uint256 amount, uint256 duration)\n        internal\n        view\n        virtual\n        returns (uint256 amountVE, uint256 amountToken);\n\n    function withdraw(address, uint256) external virtual override {\n        // Empty\n    }\n}\n"
    },
    "contracts/interfaces/IVotingEscrowDelegate.sol": {
      "content": "// SPDX-License-Identifier: UNLICENSED\npragma solidity ^0.8.0;\n\ninterface IVotingEscrowDelegate {\n    event Withdraw(address indexed addr, uint256 amount, uint256 penaltyRate);\n\n    function withdraw(address addr, uint256 penaltyRate) external;\n}\n"
    },
    "contracts/interfaces/IVotingEscrow.sol": {
      "content": "// SPDX-License-Identifier: UNLICENSED\npragma solidity ^0.8.0;\n\ninterface IVotingEscrow {\n    event SetMigrator(address indexed account);\n    event SetDelegate(address indexed account, bool isDelegate);\n    event Deposit(\n        address indexed provider,\n        uint256 value,\n        uint256 discount,\n        uint256 indexed unlockTime,\n        int128 indexed _type,\n        uint256 ts\n    );\n    event Cancel(address indexed provider, uint256 value, uint256 discount, uint256 penaltyRate, uint256 ts);\n    event Withdraw(address indexed provider, uint256 value, uint256 discount, uint256 ts);\n    event Migrate(address indexed provider, uint256 value, uint256 discount, uint256 ts);\n    event Supply(uint256 prevSupply, uint256 supply);\n\n    function interval() external view returns (uint256);\n\n    function maxDuration() external view returns (uint256);\n\n    function token() external view returns (address);\n\n    function name() external view returns (string memory);\n\n    function symbol() external view returns (string memory);\n\n    function decimals() external view returns (uint8);\n\n    function migrator() external view returns (address);\n\n    function isDelegate(address account) external view returns (bool);\n\n    function supply() external view returns (uint256);\n\n    function migrated(address account) external view returns (bool);\n\n    function delegateAt(address account, uint256 index) external view returns (address);\n\n    function locked(address account)\n        external\n        view\n        returns (\n            int128 amount,\n            int128 discount,\n            uint256 start,\n            uint256 end\n        );\n\n    function epoch() external view returns (uint256);\n\n    function pointHistory(uint256 epoch)\n        external\n        view\n        returns (\n            int128 bias,\n            int128 slope,\n            uint256 ts,\n            uint256 blk\n        );\n\n    function userPointHistory(address account, uint256 epoch)\n        external\n        view\n        returns (\n            int128 bias,\n            int128 slope,\n            uint256 ts,\n            uint256 blk\n        );\n\n    function userPointEpoch(address account) external view returns (uint256);\n\n    function slopeChanges(uint256 epoch) external view returns (int128);\n\n    function delegateLength(address addr) external view returns (uint256);\n\n    function getLastUserSlope(address addr) external view returns (int128);\n\n    function getCheckpointTime(address _addr, uint256 _idx) external view returns (uint256);\n\n    function unlockTime(address _addr) external view returns (uint256);\n\n    function setMigrator(address _migrator) external;\n\n    function setDelegate(address account, bool _isDelegate) external;\n\n    function checkpoint() external;\n\n    function depositFor(address _addr, uint256 _value) external;\n\n    function createLockFor(\n        address _addr,\n        uint256 _value,\n        uint256 _discount,\n        uint256 _duration\n    ) external;\n\n    function createLock(uint256 _value, uint256 _duration) external;\n\n    function increaseAmountFor(\n        address _addr,\n        uint256 _value,\n        uint256 _discount\n    ) external;\n\n    function increaseAmount(uint256 _value) external;\n\n    function increaseUnlockTime(uint256 _duration) external;\n\n    function cancel() external;\n\n    function withdraw() external;\n\n    function migrate() external;\n\n    function balanceOf(address addr) external view returns (uint256);\n\n    function balanceOf(address addr, uint256 _t) external view returns (uint256);\n\n    function balanceOfAt(address addr, uint256 _block) external view returns (uint256);\n\n    function totalSupply() external view returns (uint256);\n\n    function totalSupply(uint256 t) external view returns (uint256);\n\n    function totalSupplyAt(uint256 _block) external view returns (uint256);\n}\n"
    },
    "contracts/interfaces/INFT.sol": {
      "content": "// SPDX-License-Identifier: WTFPL\npragma solidity ^0.8.0;\n\ninterface INFT {\n    function balanceOf(address owner) external view returns (uint256 balance);\n\n    function safeTransferFrom(\n        address from,\n        address to,\n        uint256 tokenId\n    ) external;\n\n    function mint(\n        address to,\n        uint256 tokenId,\n        bytes calldata data\n    ) external;\n\n    function mintBatch(\n        address to,\n        uint256[] calldata tokenIds,\n        bytes calldata data\n    ) external;\n\n    function burn(\n        uint256 tokenId,\n        uint256 label,\n        bytes32 data\n    ) external;\n}\n"
    },
    "contracts/LPVotingEscrowDelegate.sol": {
      "content": "// SPDX-License-Identifier: UNLICENSED\npragma solidity ^0.8.14;\n\nimport \"@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol\";\nimport \"./uniswapv2/interfaces/IUniswapV2Pair.sol\";\nimport \"./VotingEscrowDelegate.sol\";\nimport \"./interfaces/IVotingEscrowMigrator.sol\";\n\ncontract LPVotingEscrowDelegate is VotingEscrowDelegate {\n    using SafeERC20 for IERC20;\n\n    struct LockedBalance {\n        uint256 amount;\n        uint256 end;\n    }\n\n    bool internal immutable isToken1;\n    uint256 public immutable minAmount;\n    uint256 public immutable maxBoost;\n\n    uint256 public lockedTotal;\n    mapping(address => uint256) public locked;\n\n    constructor(\n        address _ve,\n        address _lpToken,\n        address _discountToken,\n        bool _isToken1,\n        uint256 _minAmount,\n        uint256 _maxBoost\n    ) VotingEscrowDelegate(_ve, _lpToken, _discountToken) {\n        isToken1 = _isToken1;\n        minAmount = _minAmount;\n        maxBoost = _maxBoost;\n    }\n\n    function _createLock(\n        uint256 amount,\n        uint256 duration,\n        bool discounted\n    ) internal override {\n        require(amount >= minAmount, \"LSVED: AMOUNT_TOO_LOW\");\n\n        super._createLock(amount, duration, discounted);\n\n        lockedTotal += amount;\n        locked[msg.sender] += amount;\n        IERC20(token).safeTransferFrom(msg.sender, address(this), amount);\n    }\n\n    function _increaseAmount(uint256 amount, bool discounted) internal override {\n        require(amount >= minAmount, \"LSVED: AMOUNT_TOO_LOW\");\n\n        super._increaseAmount(amount, discounted);\n\n        lockedTotal += amount;\n        locked[msg.sender] += amount;\n        IERC20(token).safeTransferFrom(msg.sender, address(this), amount);\n    }\n\n    function _getAmounts(uint256 amount, uint256)\n        internal\n        view\n        override\n        returns (uint256 amountVE, uint256 amountToken)\n    {\n        (uint112 reserve0, uint112 reserve1, ) = IUniswapV2Pair(token).getReserves();\n        uint256 reserve = isToken1 ? uint256(reserve1) : uint256(reserve0);\n\n        uint256 totalSupply = IUniswapV2Pair(token).totalSupply();\n        uint256 _amountToken = (amount * reserve) / totalSupply;\n\n        amountVE = _amountToken + (_amountToken * maxBoost * (totalSupply - lockedTotal)) / totalSupply / totalSupply;\n        uint256 upperBound = (_amountToken * 333) / 10;\n        if (amountVE > upperBound) {\n            amountVE = upperBound;\n        }\n        amountToken = 0;\n    }\n\n    function withdraw(address addr, uint256 penaltyRate) external override {\n        require(msg.sender == ve, \"LSVED: FORBIDDEN\");\n\n        uint256 amount = locked[addr];\n        require(amount > 0, \"LSVED: LOCK_NOT_FOUND\");\n\n        lockedTotal -= amount;\n        locked[addr] = 0;\n        IERC20(token).safeTransfer(addr, (amount * (1e18 - penaltyRate)) / 1e18);\n\n        emit Withdraw(addr, amount, penaltyRate);\n    }\n}\n"
    },
    "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../IERC20.sol\";\nimport \"../../../utils/Address.sol\";\n\n/**\n * @title SafeERC20\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\n * contract returns false). Tokens that return no value (and instead revert or\n * throw on failure) are also supported, non-reverting calls are assumed to be\n * successful.\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\n */\nlibrary SafeERC20 {\n    using Address for address;\n\n    function safeTransfer(\n        IERC20 token,\n        address to,\n        uint256 value\n    ) internal {\n        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));\n    }\n\n    function safeTransferFrom(\n        IERC20 token,\n        address from,\n        address to,\n        uint256 value\n    ) internal {\n        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));\n    }\n\n    /**\n     * @dev Deprecated. This function has issues similar to the ones found in\n     * {IERC20-approve}, and its usage is discouraged.\n     *\n     * Whenever possible, use {safeIncreaseAllowance} and\n     * {safeDecreaseAllowance} instead.\n     */\n    function safeApprove(\n        IERC20 token,\n        address spender,\n        uint256 value\n    ) internal {\n        // safeApprove should only be called when setting an initial allowance,\n        // or when resetting it to zero. To increase and decrease it, use\n        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\n        require(\n            (value == 0) || (token.allowance(address(this), spender) == 0),\n            \"SafeERC20: approve from non-zero to non-zero allowance\"\n        );\n        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));\n    }\n\n    function safeIncreaseAllowance(\n        IERC20 token,\n        address spender,\n        uint256 value\n    ) internal {\n        uint256 newAllowance = token.allowance(address(this), spender) + value;\n        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));\n    }\n\n    function safeDecreaseAllowance(\n        IERC20 token,\n        address spender,\n        uint256 value\n    ) internal {\n        unchecked {\n            uint256 oldAllowance = token.allowance(address(this), spender);\n            require(oldAllowance >= value, \"SafeERC20: decreased allowance below zero\");\n            uint256 newAllowance = oldAllowance - value;\n            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));\n        }\n    }\n\n    /**\n     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\n     * on the return value: the return value is optional (but if data is returned, it must not be false).\n     * @param token The token targeted by the call.\n     * @param data The call data (encoded using abi.encode or one of its variants).\n     */\n    function _callOptionalReturn(IERC20 token, bytes memory data) private {\n        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\n        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\n        // the target address contains contract code and also asserts for success in the low-level call.\n\n        bytes memory returndata = address(token).functionCall(data, \"SafeERC20: low-level call failed\");\n        if (returndata.length > 0) {\n            // Return data is optional\n            require(abi.decode(returndata, (bool)), \"SafeERC20: ERC20 operation did not succeed\");\n        }\n    }\n}\n"
    },
    "contracts/uniswapv2/interfaces/IUniswapV2Pair.sol": {
      "content": "pragma solidity >=0.5.0;\n\ninterface IUniswapV2Pair {\n    event Approval(address indexed owner, address indexed spender, uint value);\n    event Transfer(address indexed from, address indexed to, uint value);\n\n    function name() external pure returns (string memory);\n    function symbol() external pure returns (string memory);\n    function decimals() external pure returns (uint8);\n    function totalSupply() external view returns (uint);\n    function balanceOf(address owner) external view returns (uint);\n    function allowance(address owner, address spender) external view returns (uint);\n\n    function approve(address spender, uint value) external returns (bool);\n    function transfer(address to, uint value) external returns (bool);\n    function transferFrom(address from, address to, uint value) external returns (bool);\n\n    function DOMAIN_SEPARATOR() external view returns (bytes32);\n    function PERMIT_TYPEHASH() external pure returns (bytes32);\n    function nonces(address owner) external view returns (uint);\n\n    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;\n\n    event Mint(address indexed sender, uint amount0, uint amount1);\n    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);\n    event Swap(\n        address indexed sender,\n        uint amount0In,\n        uint amount1In,\n        uint amount0Out,\n        uint amount1Out,\n        address indexed to\n    );\n    event Sync(uint112 reserve0, uint112 reserve1);\n\n    function MINIMUM_LIQUIDITY() external pure returns (uint);\n    function factory() external view returns (address);\n    function token0() external view returns (address);\n    function token1() external view returns (address);\n    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);\n    function price0CumulativeLast() external view returns (uint);\n    function price1CumulativeLast() external view returns (uint);\n    function kLast() external view returns (uint);\n\n    function mint(address to) external returns (uint liquidity);\n    function burn(address to) external returns (uint amount0, uint amount1);\n    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;\n    function skim(address to) external;\n    function sync() external;\n\n    function initialize(address, address) external;\n}"
    },
    "contracts/interfaces/IVotingEscrowMigrator.sol": {
      "content": "// SPDX-License-Identifier: UNLICENSED\npragma solidity ^0.8.0;\n\ninterface IVotingEscrowMigrator {\n    function migrate(\n        address account,\n        int128 amount,\n        int128 discount,\n        uint256 start,\n        uint256 end,\n        address[] calldata delegates\n    ) external;\n}\n"
    },
    "@openzeppelin/contracts/token/ERC20/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Interface of the ERC20 standard as defined in the EIP.\n */\ninterface IERC20 {\n    /**\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\n     * another (`to`).\n     *\n     * Note that `value` may be zero.\n     */\n    event Transfer(address indexed from, address indexed to, uint256 value);\n\n    /**\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\n     * a call to {approve}. `value` is the new allowance.\n     */\n    event Approval(address indexed owner, address indexed spender, uint256 value);\n\n    /**\n     * @dev Returns the amount of tokens in existence.\n     */\n    function totalSupply() external view returns (uint256);\n\n    /**\n     * @dev Returns the amount of tokens owned by `account`.\n     */\n    function balanceOf(address account) external view returns (uint256);\n\n    /**\n     * @dev Moves `amount` tokens from the caller's account to `to`.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * Emits a {Transfer} event.\n     */\n    function transfer(address to, uint256 amount) external returns (bool);\n\n    /**\n     * @dev Returns the remaining number of tokens that `spender` will be\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\n     * zero by default.\n     *\n     * This value changes when {approve} or {transferFrom} are called.\n     */\n    function allowance(address owner, address spender) external view returns (uint256);\n\n    /**\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\n     * that someone may use both the old and the new allowance by unfortunate\n     * transaction ordering. One possible solution to mitigate this race\n     * condition is to first reduce the spender's allowance to 0 and set the\n     * desired value afterwards:\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n     *\n     * Emits an {Approval} event.\n     */\n    function approve(address spender, uint256 amount) external returns (bool);\n\n    /**\n     * @dev Moves `amount` tokens from `from` to `to` using the\n     * allowance mechanism. `amount` is then deducted from the caller's\n     * allowance.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * Emits a {Transfer} event.\n     */\n    function transferFrom(\n        address from,\n        address to,\n        uint256 amount\n    ) external returns (bool);\n}\n"
    },
    "@openzeppelin/contracts/utils/Address.sol": {
      "content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)\n\npragma solidity ^0.8.1;\n\n/**\n * @dev Collection of functions related to the address type\n */\nlibrary Address {\n    /**\n     * @dev Returns true if `account` is a contract.\n     *\n     * [IMPORTANT]\n     * ====\n     * It is unsafe to assume that an address for which this function returns\n     * false is an externally-owned account (EOA) and not a contract.\n     *\n     * Among others, `isContract` will return false for the following\n     * types of addresses:\n     *\n     *  - an externally-owned account\n     *  - a contract in construction\n     *  - an address where a contract will be created\n     *  - an address where a contract lived, but was destroyed\n     * ====\n     *\n     * [IMPORTANT]\n     * ====\n     * You shouldn't rely on `isContract` to protect against flash loan attacks!\n     *\n     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets\n     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract\n     * constructor.\n     * ====\n     */\n    function isContract(address account) internal view returns (bool) {\n        // This method relies on extcodesize/address.code.length, which returns 0\n        // for contracts in construction, since the code is only stored at the end\n        // of the constructor execution.\n\n        return account.code.length > 0;\n    }\n\n    /**\n     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\n     * `recipient`, forwarding all available gas and reverting on errors.\n     *\n     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\n     * of certain opcodes, possibly making contracts go over the 2300 gas limit\n     * imposed by `transfer`, making them unable to receive funds via\n     * `transfer`. {sendValue} removes this limitation.\n     *\n     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\n     *\n     * IMPORTANT: because control is transferred to `recipient`, care must be\n     * taken to not create reentrancy vulnerabilities. Consider using\n     * {ReentrancyGuard} or the\n     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\n     */\n    function sendValue(address payable recipient, uint256 amount) internal {\n        require(address(this).balance >= amount, \"Address: insufficient balance\");\n\n        (bool success, ) = recipient.call{value: amount}(\"\");\n        require(success, \"Address: unable to send value, recipient may have reverted\");\n    }\n\n    /**\n     * @dev Performs a Solidity function call using a low level `call`. A\n     * plain `call` is an unsafe replacement for a function call: use this\n     * function instead.\n     *\n     * If `target` reverts with a revert reason, it is bubbled up by this\n     * function (like regular Solidity function calls).\n     *\n     * Returns the raw returned data. To convert to the expected return value,\n     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\n     *\n     * Requirements:\n     *\n     * - `target` must be a contract.\n     * - calling `target` with `data` must not revert.\n     *\n     * _Available since v3.1._\n     */\n    function functionCall(address target, bytes memory data) internal returns (bytes memory) {\n        return functionCall(target, data, \"Address: low-level call failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\n     * `errorMessage` as a fallback revert reason when `target` reverts.\n     *\n     * _Available since v3.1._\n     */\n    function functionCall(\n        address target,\n        bytes memory data,\n        string memory errorMessage\n    ) internal returns (bytes memory) {\n        return functionCallWithValue(target, data, 0, errorMessage);\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n     * but also transferring `value` wei to `target`.\n     *\n     * Requirements:\n     *\n     * - the calling contract must have an ETH balance of at least `value`.\n     * - the called Solidity function must be `payable`.\n     *\n     * _Available since v3.1._\n     */\n    function functionCallWithValue(\n        address target,\n        bytes memory data,\n        uint256 value\n    ) internal returns (bytes memory) {\n        return functionCallWithValue(target, data, value, \"Address: low-level call with value failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\n     * with `errorMessage` as a fallback revert reason when `target` reverts.\n     *\n     * _Available since v3.1._\n     */\n    function functionCallWithValue(\n        address target,\n        bytes memory data,\n        uint256 value,\n        string memory errorMessage\n    ) internal returns (bytes memory) {\n        require(address(this).balance >= value, \"Address: insufficient balance for call\");\n        require(isContract(target), \"Address: call to non-contract\");\n\n        (bool success, bytes memory returndata) = target.call{value: value}(data);\n        return verifyCallResult(success, returndata, errorMessage);\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n     * but performing a static call.\n     *\n     * _Available since v3.3._\n     */\n    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {\n        return functionStaticCall(target, data, \"Address: low-level static call failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\n     * but performing a static call.\n     *\n     * _Available since v3.3._\n     */\n    function functionStaticCall(\n        address target,\n        bytes memory data,\n        string memory errorMessage\n    ) internal view returns (bytes memory) {\n        require(isContract(target), \"Address: static call to non-contract\");\n\n        (bool success, bytes memory returndata) = target.staticcall(data);\n        return verifyCallResult(success, returndata, errorMessage);\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n     * but performing a delegate call.\n     *\n     * _Available since v3.4._\n     */\n    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {\n        return functionDelegateCall(target, data, \"Address: low-level delegate call failed\");\n    }\n\n    /**\n     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\n     * but performing a delegate call.\n     *\n     * _Available since v3.4._\n     */\n    function functionDelegateCall(\n        address target,\n        bytes memory data,\n        string memory errorMessage\n    ) internal returns (bytes memory) {\n        require(isContract(target), \"Address: delegate call to non-contract\");\n\n        (bool success, bytes memory returndata) = target.delegatecall(data);\n        return verifyCallResult(success, returndata, errorMessage);\n    }\n\n    /**\n     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the\n     * revert reason using the provided one.\n     *\n     * _Available since v4.3._\n     */\n    function verifyCallResult(\n        bool success,\n        bytes memory returndata,\n        string memory errorMessage\n    ) internal pure returns (bytes memory) {\n        if (success) {\n            return returndata;\n        } else {\n            // Look for revert reason and bubble it up if present\n            if (returndata.length > 0) {\n                // The easiest way to bubble the revert reason is using memory via assembly\n\n                assembly {\n                    let returndata_size := mload(returndata)\n                    revert(add(32, returndata), returndata_size)\n                }\n            } else {\n                revert(errorMessage);\n            }\n        }\n    }\n}\n"
    },
    "contracts/VotingEscrow.sol": {
      "content": "// SPDX-License-Identifier: UNLICENSED\npragma solidity ^0.8.14;\n\nimport \"@openzeppelin/contracts/access/Ownable.sol\";\nimport \"@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol\";\nimport \"@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol\";\nimport \"@openzeppelin/contracts/security/ReentrancyGuard.sol\";\nimport \"./interfaces/IVotingEscrow.sol\";\nimport \"./interfaces/IVotingEscrowMigrator.sol\";\nimport \"./interfaces/IVotingEscrowDelegate.sol\";\nimport \"./libraries/Integers.sol\";\n\n/**\n * @title Voting Escrow\n * @author LevX (team@levx.io)\n * @notice Votes have a weight depending on time, so that users are\n *         committed to the future of (whatever they are voting for)\n * @dev Vote weight decays linearly over time. Lock time cannot be\n *      more than `MAXTIME`.\n * @dev Ported from vyper (https://github.com/curvefi/curve-dao-contracts/blob/master/contracts/VotingEscrow.vy)\n */\n\n// Voting escrow to have time-weighted votes\n// Votes have a weight depending on time, so that users are committed\n// to the future of (whatever they are voting for).\n// The weight in this implementation is linear, and lock cannot be more than maxtime:\n// w ^\n// 1 +        /\n//   |      /\n//   |    /\n//   |  /\n//   |/\n// 0 +--------+------> time\n//       maxtime\n\ncontract VotingEscrow is Ownable, ReentrancyGuard, IVotingEscrow {\n    using SafeERC20 for IERC20;\n    using Integers for int128;\n    using Integers for uint256;\n\n    struct Point {\n        int128 bias;\n        int128 slope; // - dweight / dt\n        uint256 ts;\n        uint256 blk; // block\n    }\n\n    struct LockedBalance {\n        int128 amount;\n        int128 discount;\n        uint256 start;\n        uint256 end;\n    }\n\n    int128 public constant DEPOSIT_FOR_TYPE = 0;\n    int128 public constant CRETE_LOCK_TYPE = 1;\n    int128 public constant INCREASE_LOCK_AMOUNT = 2;\n    int128 public constant INCREASE_UNLOCK_TIME = 3;\n    uint256 internal constant MULTIPLIER = 1e18;\n\n    uint256 public immutable override interval;\n    uint256 public immutable override maxDuration;\n    address public immutable override token;\n    string public override name;\n    string public override symbol;\n    uint8 public immutable override decimals;\n\n    address public override migrator;\n    mapping(address => bool) public override isDelegate;\n\n    uint256 public override supply;\n    mapping(address => bool) public override migrated;\n    mapping(address => address[]) public override delegateAt;\n    mapping(address => LockedBalance) public override locked;\n    uint256 public override epoch;\n\n    mapping(uint256 => Point) public override pointHistory; // epoch -> unsigned point\n    mapping(address => mapping(uint256 => Point)) public override userPointHistory; // user -> Point[user_epoch]\n    mapping(address => uint256) public override userPointEpoch;\n    mapping(uint256 => int128) public override slopeChanges; // time -> signed slope change\n\n    constructor(\n        address _token,\n        string memory _name,\n        string memory _symbol,\n        uint256 _interval,\n        uint256 _maxDuration\n    ) {\n        token = _token;\n        name = _name;\n        symbol = _symbol;\n        decimals = IERC20Metadata(_token).decimals();\n\n        interval = _interval;\n        maxDuration = (_maxDuration / _interval) * _interval; // rounded down to a multiple of interval\n\n        pointHistory[0].blk = block.number;\n        pointHistory[0].ts = block.timestamp;\n    }\n\n    modifier beforeMigrated(address addr) {\n        require(!migrated[addr], \"VE: LOCK_MIGRATED\");\n        _;\n    }\n\n    modifier onlyDelegate {\n        require(isDelegate[msg.sender], \"VE: NOT_DELEGATE\");\n        _;\n    }\n\n    /**\n     * @notice Check if the call is from an EOA or a whitelisted smart contract, revert if not\n     */\n    modifier authorized {\n        if (msg.sender != tx.origin) {\n            require(isDelegate[msg.sender], \"VE: CONTRACT_NOT_DELEGATE\");\n        }\n        _;\n    }\n\n    function delegateLength(address addr) external view returns (uint256) {\n        return delegateAt[addr].length;\n    }\n\n    /**\n     * @notice Get the most recently recorded rate of voting power decrease for `addr`\n     * @param addr Address of the user wallet\n     * @return Value of the slope\n     */\n    function getLastUserSlope(address addr) external view override returns (int128) {\n        uint256 uepoch = userPointEpoch[addr];\n        return userPointHistory[addr][uepoch].slope;\n    }\n\n    /**\n     * @notice Get the timestamp for checkpoint `_idx` for `_addr`\n     * @param _addr User wallet address\n     * @param _idx User epoch number\n     * @return Epoch time of the checkpoint\n     */\n    function getCheckpointTime(address _addr, uint256 _idx) external view override returns (uint256) {\n        return userPointHistory[_addr][_idx].ts;\n    }\n\n    /**\n     * @notice Get timestamp when `_addr`'s lock finishes\n     * @param _addr User wallet\n     * @return Epoch time of the lock end\n     */\n    function unlockTime(address _addr) external view override returns (uint256) {\n        return locked[_addr].end;\n    }\n\n    function setMigrator(address _migrator) external override onlyOwner {\n        require(migrator == address(0), \"VE: MIGRATOR_SET\");\n\n        migrator = _migrator;\n\n        emit SetMigrator(_migrator);\n    }\n\n    function setDelegate(address account, bool _isDelegate) external override onlyOwner {\n        isDelegate[account] = _isDelegate;\n\n        emit SetDelegate(account, _isDelegate);\n    }\n\n    /**\n     * @notice Record global and per-user data to checkpoint\n     * @param addr User's wallet address. No user checkpoint if 0x0\n     * @param old_locked Pevious locked amount / end lock time for the user\n     * @param new_locked New locked amount / end lock time for the user\n     */\n    function _checkpoint(\n        address addr,\n        LockedBalance memory old_locked,\n        LockedBalance memory new_locked\n    ) internal {\n        Point memory u_old;\n        Point memory u_new;\n        int128 old_dslope;\n        int128 new_dslope;\n        uint256 _epoch = epoch;\n\n        if (addr != address(0)) {\n            // Calculate slopes and biases\n            // Kept at zero when they have to\n            if (old_locked.end > block.timestamp && old_locked.amount > 0) {\n                u_old.slope = old_locked.amount / maxDuration.toInt128();\n                u_old.bias = u_old.slope * (old_locked.end - block.timestamp).toInt128();\n            }\n            if (new_locked.end > block.timestamp && new_locked.amount > 0) {\n                u_new.slope = new_locked.amount / maxDuration.toInt128();\n                u_new.bias = u_new.slope * (new_locked.end - block.timestamp).toInt128();\n            }\n\n            // Read values of scheduled changes in the slope\n            // old_locked.end can be in the past and in the future\n            // new_locked.end can ONLY by in the FUTURE unless everything expired: than zeros\n            old_dslope = slopeChanges[old_locked.end];\n            if (new_locked.end != 0) {\n                if (new_locked.end == old_locked.end) new_dslope = old_dslope;\n                else new_dslope = slopeChanges[new_locked.end];\n            }\n        }\n\n        Point memory last_point = Point({bias: 0, slope: 0, ts: block.timestamp, blk: block.number});\n        if (_epoch > 0) last_point = pointHistory[_epoch];\n        uint256 last_checkpoint = last_point.ts;\n        // initial_last_point is used for extrapolation to calculate block number\n        // (approximately, for *At methods) and save them\n        // as we cannot figure that out exactly from inside the contract\n        Point memory initial_last_point = Point(last_point.bias, last_point.slope, last_point.ts, last_point.blk);\n        uint256 block_slope; // dblock/dt\n        if (block.timestamp > last_point.ts)\n            block_slope = (MULTIPLIER * (block.number - last_point.blk)) / (block.timestamp - last_point.ts);\n        // If last point is already recorded in this block, slope=0\n        // But that's ok b/c we know the block in such case\n\n        {\n            // Go over weeks to fill history and calculate what the current point is\n            uint256 t_i = (last_checkpoint / interval) * interval;\n            for (uint256 i; i < 255; i++) {\n                // Hopefully it won't happen that this won't get used in 5 years!\n                // If it does, users will be able to withdraw but vote weight will be broken\n                t_i += interval;\n                int128 d_slope;\n                if (t_i > block.timestamp) t_i = block.timestamp;\n                else d_slope = slopeChanges[t_i];\n                last_point.bias -= last_point.slope * (t_i - last_checkpoint).toInt128();\n                last_point.slope += d_slope;\n                if (last_point.bias < 0)\n                    // This can happen\n                    last_point.bias = 0;\n                if (last_point.slope < 0)\n                    // This cannot happen - just in case\n                    last_point.slope = 0;\n                last_checkpoint = t_i;\n                last_point.ts = t_i;\n                last_point.blk = initial_last_point.blk + (block_slope * (t_i - initial_last_point.ts)) / MULTIPLIER;\n                _epoch += 1;\n                if (t_i == block.timestamp) {\n                    last_point.blk = block.number;\n                    break;\n                } else pointHistory[_epoch] = last_point;\n            }\n        }\n\n        epoch = _epoch;\n        // Now point_history is filled until t=now\n\n        if (addr != address(0)) {\n            // If last point was in this block, the slope change has been applied already\n            // But in such case we have 0 slope(s)\n            last_point.slope += (u_new.slope - u_old.slope);\n            last_point.bias += (u_new.bias - u_old.bias);\n            if (last_point.slope < 0) last_point.slope = 0;\n            if (last_point.bias < 0) last_point.bias = 0;\n        }\n\n        // Record the changed point into history\n        pointHistory[_epoch] = last_point;\n\n        if (addr != address(0)) {\n            // Schedule the slope changes (slope is going down)\n            // We subtract new_user_slope from [new_locked.end]\n            // and add old_user_slope to [old_locked.end]\n            if (old_locked.end > block.timestamp) {\n                // old_dslope was <something> - u_old.slope, so we cancel that\n                old_dslope += u_old.slope;\n                if (new_locked.end == old_locked.end) old_dslope -= u_new.slope; // It was a new deposit, not extension\n                slopeChanges[old_locked.end] = old_dslope;\n            }\n\n            if (new_locked.end > block.timestamp) {\n                if (new_locked.end > old_locked.end) {\n                    new_dslope -= u_new.slope; // old slope disappeared at this point\n                    slopeChanges[new_locked.end] = new_dslope;\n                }\n                // else: we recorded it already in old_dslope\n            }\n\n            // Now handle user history\n            uint256 user_epoch = userPointEpoch[addr] + 1;\n\n            userPointEpoch[addr] = user_epoch;\n            u_new.ts = block.timestamp;\n            u_new.blk = block.number;\n            userPointHistory[addr][user_epoch] = u_new;\n        }\n    }\n\n    /**\n     * @notice Deposit and lock tokens for a user\n     * @param _addr User's wallet address\n     * @param _value Amount to deposit\n     * @param _discount Amount to get discounted out of _value\n     * @param unlock_time New time when to unlock the tokens, or 0 if unchanged\n     * @param locked_balance Previous locked amount / timestamp\n     */\n    function _depositFor(\n        address _addr,\n        uint256 _value,\n        uint256 _discount,\n        uint256 unlock_time,\n        LockedBalance memory locked_balance,\n        int128 _type\n    ) internal {\n        LockedBalance memory _locked = locked_balance;\n        uint256 supply_before = supply;\n\n        supply = supply_before + _value;\n        LockedBalance memory old_locked;\n        (old_locked.amount, old_locked.discount, old_locked.start, old_locked.end) = (\n            _locked.amount,\n            _locked.discount,\n            _locked.start,\n            _locked.end\n        );\n        // Adding to existing lock, or if a lock is expired - creating a new one\n        _locked.amount += (_value).toInt128();\n        if (_discount != 0) _locked.discount += _discount.toInt128();\n        if (unlock_time != 0) {\n            if (_locked.start == 0) _locked.start = block.timestamp;\n            _locked.end = unlock_time;\n        }\n        locked[_addr] = _locked;\n\n        // Possibilities:\n        // Both old_locked.end could be current or expired (>/< block.timestamp)\n        // value == 0 (extend lock) or value > 0 (add to lock or extend lock)\n        // _locked.end > block.timestamp (always)\n        _checkpoint(_addr, old_locked, _locked);\n\n        if (_value > _discount) {\n            IERC20(token).safeTransferFrom(_addr, address(this), _value - _discount);\n        }\n\n        emit Deposit(_addr, _value, _discount, _locked.end, _type, block.timestamp);\n        emit Supply(supply_before, supply_before + _value);\n    }\n\n    function _pushDelegate(address addr, address delegate) internal {\n        bool found;\n        address[] storage delegates = delegateAt[addr];\n        for (uint256 i; i < delegates.length; ) {\n            if (delegates[i] == delegate) found = true;\n            unchecked {\n                ++i;\n            }\n        }\n        if (!found) delegateAt[addr].push(delegate);\n    }\n\n    /**\n     * @notice Record global data to checkpoint\n     */\n    function checkpoint() external override {\n        _checkpoint(address(0), LockedBalance(0, 0, 0, 0), LockedBalance(0, 0, 0, 0));\n    }\n\n    /**\n     * @notice Deposit `_value` tokens for `_addr` and add to the lock\n     * @dev Anyone (even a smart contract) can deposit for someone else, but\n     *      cannot extend their locktime and deposit for a brand new user\n     * @param _addr User's wallet address\n     * @param _value Amount to add to user's lock\n     */\n    function depositFor(address _addr, uint256 _value) external override nonReentrant beforeMigrated(_addr) {\n        LockedBalance memory _locked = locked[_addr];\n\n        require(_value > 0, \"VE: INVALID_VALUE\");\n        require(_locked.amount > 0, \"VE: LOCK_NOT_FOUND\");\n        require(_locked.end > block.timestamp, \"VE: LOCK_EXPIRED\");\n\n        _depositFor(_addr, _value, 0, 0, _locked, DEPOSIT_FOR_TYPE);\n    }\n\n    /**\n     * @notice Deposit `_value` tokens with `_discount` for `_addr` and lock for `_duration`\n     * @dev Only delegates can creat a lock for someone else\n     * @param _addr User's wallet address\n     * @param _value Amount to add to user's lock\n     * @param _discount Amount to get discounted out of _value\n     * @param _duration Epoch time until tokens unlock from now\n     */\n    function createLockFor(\n        address _addr,\n        uint256 _value,\n        uint256 _discount,\n        uint256 _duration\n    ) external override nonReentrant onlyDelegate beforeMigrated(_addr) {\n        _pushDelegate(_addr, msg.sender);\n\n        uint256 unlock_time = ((block.timestamp + _duration) / interval) * interval; // Locktime is rounded down to a multiple of interval\n        LockedBalance memory _locked = locked[_addr];\n\n        require(_value > 0, \"VE: INVALID_VALUE\");\n        require(_value >= _discount, \"VE: DISCOUNT_TOO_HIGH\");\n        require(_locked.amount == 0, \"VE: EXISTING_LOCK_FOUND\");\n        require(unlock_time > block.timestamp, \"VE: UNLOCK_TIME_TOO_EARLY\");\n        require(unlock_time <= block.timestamp + maxDuration, \"VE: UNLOCK_TIME_TOO_LATE\");\n\n        _depositFor(_addr, _value, _discount, unlock_time, _locked, CRETE_LOCK_TYPE);\n    }\n\n    /**\n     * @notice Deposit `_value` tokens for `msg.sender` and lock for `_duration`\n     * @param _value Amount to deposit\n     * @param _duration Epoch time until tokens unlock from now\n     */\n    function createLock(uint256 _value, uint256 _duration)\n        external\n        override\n        nonReentrant\n        authorized\n        beforeMigrated(msg.sender)\n    {\n        uint256 unlock_time = ((block.timestamp + _duration) / interval) * interval; // Locktime is rounded down to a multiple of interval\n        LockedBalance memory _locked = locked[msg.sender];\n\n        require(_value > 0, \"VE: INVALID_VALUE\");\n        require(_locked.amount == 0, \"VE: EXISTING_LOCK_FOUND\");\n        require(unlock_time > block.timestamp, \"VE: UNLOCK_TIME_TOO_EARLY\");\n        require(unlock_time <= block.timestamp + maxDuration, \"VE: UNLOCK_TIME_TOO_LATE\");\n\n        _depositFor(msg.sender, _value, 0, unlock_time, _locked, CRETE_LOCK_TYPE);\n    }\n\n    /**\n     * @notice Deposit `_value` additional tokens for `msg.sender`\n     *          without modifying the unlock time\n     * @param _addr User's wallet address\n     * @param _value Amount of tokens to deposit and add to the lock\n     * @param _discount Amount to get discounted out of _value\n     */\n    function increaseAmountFor(\n        address _addr,\n        uint256 _value,\n        uint256 _discount\n    ) external override nonReentrant onlyDelegate beforeMigrated(_addr) {\n        _pushDelegate(_addr, msg.sender);\n\n        LockedBalance memory _locked = locked[_addr];\n\n        require(_value > 0, \"VE: INVALID_VALUE\");\n        require(_value >= _discount, \"VE: DISCOUNT_TOO_HIGH\");\n        require(_locked.amount > 0, \"VE: LOCK_NOT_FOUND\");\n        require(_locked.end > block.timestamp, \"VE: LOCK_EXPIRED\");\n\n        _depositFor(_addr, _value, _discount, 0, _locked, INCREASE_LOCK_AMOUNT);\n    }\n\n    /**\n     * @notice Deposit `_value` additional tokens for `msg.sender`\n     *          without modifying the unlock time\n     *