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// SPDX-License-Identifier: MIT

pragma solidity ^0.7.3;

import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";

import "./GraphTokenLock.sol";
import "./IGraphTokenLockManager.sol";

/**
 * @title GraphTokenLockWallet
 * @notice This contract is built on top of the base GraphTokenLock functionality.
 * It allows wallet beneficiaries to use the deposited funds to perform specific function calls
 * on specific contracts.
 *
 * The idea is that supporters with locked tokens can participate in the protocol
 * but disallow any release before the vesting/lock schedule.
 * The beneficiary can issue authorized function calls to this contract that will
 * get forwarded to a target contract. A target contract is any of our protocol contracts.
 * The function calls allowed are queried to the GraphTokenLockManager, this way
 * the same configuration can be shared for all the created lock wallet contracts.
 *
 * NOTE: Contracts used as target must have its function signatures checked to avoid collisions
 * with any of this contract functions.
 * Beneficiaries need to approve the use of the tokens to the protocol contracts. For convenience
 * the maximum amount of tokens is authorized.
 */
contract GraphTokenLockWallet is GraphTokenLock {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    // -- State --

    IGraphTokenLockManager public manager;
    uint256 public usedAmount;

    uint256 private constant MAX_UINT256 = 2**256 - 1;

    // -- Events --

    event ManagerUpdated(address indexed _oldManager, address indexed _newManager);
    event TokenDestinationsApproved();
    event TokenDestinationsRevoked();

    // Initializer
    function initialize(
        address _manager,
        address _owner,
        address _beneficiary,
        address _token,
        uint256 _managedAmount,
        uint256 _startTime,
        uint256 _endTime,
        uint256 _periods,
        uint256 _releaseStartTime,
        uint256 _vestingCliffTime,
        Revocability _revocable
    ) external {
        _initialize(
            _owner,
            _beneficiary,
            _token,
            _managedAmount,
            _startTime,
            _endTime,
            _periods,
            _releaseStartTime,
            _vestingCliffTime,
            _revocable
        );
        _setManager(_manager);
    }

    // -- Admin --

    /**
     * @notice Sets a new manager for this contract
     * @param _newManager Address of the new manager
     */
    function setManager(address _newManager) external onlyOwner {
        _setManager(_newManager);
    }

    /**
     * @dev Sets a new manager for this contract
     * @param _newManager Address of the new manager
     */
    function _setManager(address _newManager) private {
        require(_newManager != address(0), "Manager cannot be empty");
        require(Address.isContract(_newManager), "Manager must be a contract");

        address oldManager = address(manager);
        manager = IGraphTokenLockManager(_newManager);

        emit ManagerUpdated(oldManager, _newManager);
    }

    // -- Beneficiary --

    /**
     * @notice Approves protocol access of the tokens managed by this contract
     * @dev Approves all token destinations registered in the manager to pull tokens
     */
    function approveProtocol() external onlyBeneficiary {
        address[] memory dstList = manager.getTokenDestinations();
        for (uint256 i = 0; i < dstList.length; i++) {
            token.safeApprove(dstList[i], MAX_UINT256);
        }
        emit TokenDestinationsApproved();
    }

    /**
     * @notice Revokes protocol access of the tokens managed by this contract
     * @dev Revokes approval to all token destinations in the manager to pull tokens
     */
    function revokeProtocol() external onlyBeneficiary {
        address[] memory dstList = manager.getTokenDestinations();
        for (uint256 i = 0; i < dstList.length; i++) {
            token.safeApprove(dstList[i], 0);
        }
        emit TokenDestinationsRevoked();
    }

    /**
     * @notice Forward authorized contract calls to protocol contracts
     * @dev Fallback function can be called by the beneficiary only if function call is allowed
     */
    fallback() external payable {
        // Only beneficiary can forward calls
        require(msg.sender == beneficiary, "Unauthorized caller");

        // Function call validation
        address _target = manager.getAuthFunctionCallTarget(msg.sig);
        require(_target != address(0), "Unauthorized function");

        uint256 oldBalance = currentBalance();

        // Call function with data
        Address.functionCall(_target, msg.data);

        // Tracked used tokens in the protocol
        // We do this check after balances were updated by the forwarded call
        // Check is only enforced for revocable contracts to save some gas
        if (revocable == Revocability.Enabled) {
            // Track contract balance change
            uint256 newBalance = currentBalance();
            if (newBalance < oldBalance) {
                // Outflow
                uint256 diff = oldBalance.sub(newBalance);
                usedAmount = usedAmount.add(diff);
            } else {
                // Inflow: We can receive profits from the protocol, that could make usedAmount to
                // underflow. We set it to zero in that case.
                uint256 diff = newBalance.sub(oldBalance);
                usedAmount = (diff >= usedAmount) ? 0 : usedAmount.sub(diff);
            }
            require(usedAmount <= vestedAmount(), "Cannot use more tokens than vested amount");
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

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

        return c;
    }

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

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

        return c;
    }

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

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

        return c;
    }

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

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

        return c;
    }

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

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

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.3;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";

import "./Ownable.sol";
import "./MathUtils.sol";
import "./IGraphTokenLock.sol";

/**
 * @title GraphTokenLock
 * @notice Contract that manages an unlocking schedule of tokens.
 * @dev The contract lock manage a number of tokens deposited into the contract to ensure that
 * they can only be released under certain time conditions.
 *
 * This contract implements a release scheduled based on periods and tokens are released in steps
 * after each period ends. It can be configured with one period in which case it is like a plain TimeLock.
 * It also supports revocation to be used for vesting schedules.
 *
 * The contract supports receiving extra funds than the managed tokens ones that can be
 * withdrawn by the beneficiary at any time.
 *
 * A releaseStartTime parameter is included to override the default release schedule and
 * perform the first release on the configured time. After that it will continue with the
 * default schedule.
 */
abstract contract GraphTokenLock is Ownable, IGraphTokenLock {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    uint256 private constant MIN_PERIOD = 1;

    // -- State --

    IERC20 public token;
    address public beneficiary;

    // Configuration

    // Amount of tokens managed by the contract schedule
    uint256 public managedAmount;

    uint256 public startTime; // Start datetime (in unixtimestamp)
    uint256 public endTime; // Datetime after all funds are fully vested/unlocked (in unixtimestamp)
    uint256 public periods; // Number of vesting/release periods

    // First release date for tokens (in unixtimestamp)
    // If set, no tokens will be released before releaseStartTime ignoring
    // the amount to release each period
    uint256 public releaseStartTime;
    // A cliff set a date to which a beneficiary needs to get to vest
    // all preceding periods
    uint256 public vestingCliffTime;
    Revocability public revocable; // Whether to use vesting for locked funds

    // State

    bool public isRevoked;
    bool public isInitialized;
    uint256 public releasedAmount;

    // -- Events --

    event TokensReleased(address indexed beneficiary, uint256 amount);
    event TokensWithdrawn(address indexed beneficiary, uint256 amount);
    event TokensRevoked(address indexed beneficiary, uint256 amount);

    /**
     * @dev Only allow calls from the beneficiary of the contract
     */
    modifier onlyBeneficiary() {
        require(msg.sender == beneficiary, "!auth");
        _;
    }

    /**
     * @notice Initializes the contract
     * @param _owner Address of the contract owner
     * @param _beneficiary Address of the beneficiary of locked tokens
     * @param _managedAmount Amount of tokens to be managed by the lock contract
     * @param _startTime Start time of the release schedule
     * @param _endTime End time of the release schedule
     * @param _periods Number of periods between start time and end time
     * @param _releaseStartTime Override time for when the releases start
     * @param _vestingCliffTime Override time for when the vesting start
     * @param _revocable Whether the contract is revocable
     */
    function _initialize(
        address _owner,
        address _beneficiary,
        address _token,
        uint256 _managedAmount,
        uint256 _startTime,
        uint256 _endTime,
        uint256 _periods,
        uint256 _releaseStartTime,
        uint256 _vestingCliffTime,
        Revocability _revocable
    ) internal {
        require(!isInitialized, "Already initialized");
        require(_owner != address(0), "Owner cannot be zero");
        require(_beneficiary != address(0), "Beneficiary cannot be zero");
        require(_token != address(0), "Token cannot be zero");
        require(_managedAmount > 0, "Managed tokens cannot be zero");
        require(_startTime != 0, "Start time must be set");
        require(_startTime < _endTime, "Start time > end time");
        require(_periods >= MIN_PERIOD, "Periods cannot be below minimum");
        require(_revocable != Revocability.NotSet, "Must set a revocability option");
        require(_releaseStartTime < _endTime, "Release start time must be before end time");
        require(_vestingCliffTime < _endTime, "Cliff time must be before end time");

        isInitialized = true;

        Ownable.initialize(_owner);
        beneficiary = _beneficiary;
        token = IERC20(_token);

        managedAmount = _managedAmount;

        startTime = _startTime;
        endTime = _endTime;
        periods = _periods;

        // Optionals
        releaseStartTime = _releaseStartTime;
        vestingCliffTime = _vestingCliffTime;
        revocable = _revocable;
    }

    // -- Balances --

    /**
     * @notice Returns the amount of tokens currently held by the contract
     * @return Tokens held in the contract
     */
    function currentBalance() public override view returns (uint256) {
        return token.balanceOf(address(this));
    }

    // -- Time & Periods --

    /**
     * @notice Returns the current block timestamp
     * @return Current block timestamp
     */
    function currentTime() public override view returns (uint256) {
        return block.timestamp;
    }

    /**
     * @notice Gets duration of contract from start to end in seconds
     * @return Amount of seconds from contract startTime to endTime
     */
    function duration() public override view returns (uint256) {
        return endTime.sub(startTime);
    }

    /**
     * @notice Gets time elapsed since the start of the contract
     * @dev Returns zero if called before conctract starTime
     * @return Seconds elapsed from contract startTime
     */
    function sinceStartTime() public override view returns (uint256) {
        uint256 current = currentTime();
        if (current <= startTime) {
            return 0;
        }
        return current.sub(startTime);
    }

    /**
     * @notice Returns amount available to be released after each period according to schedule
     * @return Amount of tokens available after each period
     */
    function amountPerPeriod() public override view returns (uint256) {
        return managedAmount.div(periods);
    }

    /**
     * @notice Returns the duration of each period in seconds
     * @return Duration of each period in seconds
     */
    function periodDuration() public override view returns (uint256) {
        return duration().div(periods);
    }

    /**
     * @notice Gets the current period based on the schedule
     * @return A number that represents the current period
     */
    function currentPeriod() public override view returns (uint256) {
        return sinceStartTime().div(periodDuration()).add(MIN_PERIOD);
    }

    /**
     * @notice Gets the number of periods that passed since the first period
     * @return A number of periods that passed since the schedule started
     */
    function passedPeriods() public override view returns (uint256) {
        return currentPeriod().sub(MIN_PERIOD);
    }

    // -- Locking & Release Schedule --

    /**
     * @notice Gets the currently available token according to the schedule
     * @dev Implements the step-by-step schedule based on periods for available tokens
     * @return Amount of tokens available according to the schedule
     */
    function availableAmount() public override view returns (uint256) {
        uint256 current = currentTime();

        // Before contract start no funds are available
        if (current < startTime) {
            return 0;
        }

        // After contract ended all funds are available
        if (current > endTime) {
            return managedAmount;
        }

        // Get available amount based on period
        return passedPeriods().mul(amountPerPeriod());
    }

    /**
     * @notice Gets the amount of currently vested tokens
     * @dev Similar to available amount, but is fully vested when contract is non-revocable
     * @return Amount of tokens already vested
     */
    function vestedAmount() public override view returns (uint256) {
        // If non-revocable it is fully vested
        if (revocable == Revocability.Disabled) {
            return managedAmount;
        }

        // Vesting cliff is activated and it has not passed means nothing is vested yet
        if (vestingCliffTime > 0 && currentTime() < vestingCliffTime) {
            return 0;
        }

        return availableAmount();
    }

    /**
     * @notice Gets tokens currently available for release
     * @dev Considers the schedule and takes into account already released tokens
     * @return Amount of tokens ready to be released
     */
    function releasableAmount() public override view returns (uint256) {
        // If a release start time is set no tokens are available for release before this date
        // If not set it follows the default schedule and tokens are available on
        // the first period passed
        if (releaseStartTime > 0 && currentTime() < releaseStartTime) {
            return 0;
        }

        // Vesting cliff is activated and it has not passed means nothing is vested yet
        // so funds cannot be released
        if (revocable == Revocability.Enabled && vestingCliffTime > 0 && currentTime() < vestingCliffTime) {
            return 0;
        }

        // A beneficiary can never have more releasable tokens than the contract balance
        uint256 releasable = availableAmount().sub(releasedAmount);
        return MathUtils.min(currentBalance(), releasable);
    }

    /**
     * @notice Gets the outstanding amount yet to be released based on the whole contract lifetime
     * @dev Does not consider schedule but just global amounts tracked
     * @return Amount of outstanding tokens for the lifetime of the contract
     */
    function totalOutstandingAmount() public override view returns (uint256) {
        return managedAmount.sub(releasedAmount);
    }

    /**
     * @notice Gets surplus amount in the contract based on outstanding amount to release
     * @dev All funds over outstanding amount is considered surplus that can be withdrawn by beneficiary
     * @return Amount of tokens considered as surplus
     */
    function surplusAmount() public override view returns (uint256) {
        uint256 balance = currentBalance();
        uint256 outstandingAmount = totalOutstandingAmount();
        if (balance > outstandingAmount) {
            return balance.sub(outstandingAmount);
        }
        return 0;
    }

    // -- Value Transfer --

    /**
     * @notice Releases tokens based on the configured schedule
     * @dev All available releasable tokens are transferred to beneficiary
     */
    function release() external override onlyBeneficiary {
        uint256 amountToRelease = releasableAmount();
        require(amountToRelease > 0, "No available releasable amount");

        releasedAmount = releasedAmount.add(amountToRelease);

        token.safeTransfer(beneficiary, amountToRelease);

        emit TokensReleased(beneficiary, amountToRelease);
    }

    /**
     * @notice Withdraws surplus, unmanaged tokens from the contract
     * @dev Tokens in the contract over outstanding amount are considered as surplus
     * @param _amount Amount of tokens to withdraw
     */
    function withdrawSurplus(uint256 _amount) external override onlyBeneficiary {
        require(_amount > 0, "Amount cannot be zero");
        require(surplusAmount() >= _amount, "Amount requested > surplus available");

        token.safeTransfer(beneficiary, _amount);

        emit TokensWithdrawn(beneficiary, _amount);
    }

    /**
     * @notice Revokes a vesting schedule and return the unvested tokens to the owner
     * @dev Vesting schedule is always calculated based on managed tokens
     */
    function revoke() external override onlyOwner {
        require(revocable == Revocability.Enabled, "Contract is non-revocable");
        require(isRevoked == false, "Already revoked");

        uint256 unvestedAmount = managedAmount.sub(vestedAmount());
        require(unvestedAmount > 0, "No available unvested amount");

        isRevoked = true;

        token.safeTransfer(owner(), unvestedAmount);

        emit TokensRevoked(beneficiary, unvestedAmount);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.3;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

import "./IGraphTokenLock.sol";

interface IGraphTokenLockManager {
    // -- Factory --

    function setMasterCopy(address _masterCopy) external;

    function createTokenLockWallet(
        address _owner,
        address _beneficiary,
        uint256 _managedAmount,
        uint256 _startTime,
        uint256 _endTime,
        uint256 _periods,
        uint256 _releaseStartTime,
        uint256 _vestingCliffTime,
        IGraphTokenLock.Revocability _revocable
    ) external;

    // -- Funds Management --

    function token() external returns (IERC20);

    function deposit(uint256 _amount) external;

    function withdraw(uint256 _amount) external;

    // -- Allowed Funds Destinations --

    function addTokenDestination(address _dst) external;

    function removeTokenDestination(address _dst) external;

    function isTokenDestination(address _dst) external view returns (bool);

    function getTokenDestinations() external view returns (address[] memory);

    // -- Function Call Authorization --

    function setAuthFunctionCall(string calldata _signature, address _target) external;

    function unsetAuthFunctionCall(string calldata _signature) external;

    function setAuthFunctionCallMany(string[] calldata _signatures, address[] calldata _targets) external;

    function getAuthFunctionCallTarget(bytes4 _sigHash) external view returns (address);

    function isAuthFunctionCall(bytes4 _sigHash) external view returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.3;

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.3;

library MathUtils {
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.3;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IGraphTokenLock {
    enum Revocability { NotSet, Enabled, Disabled }

    // -- Balances --

    function currentBalance() external view returns (uint256);

    // -- Time & Periods --

    function currentTime() external view returns (uint256);

    function duration() external view returns (uint256);

    function sinceStartTime() external view returns (uint256);

    function amountPerPeriod() external view returns (uint256);

    function periodDuration() external view returns (uint256);

    function currentPeriod() external view returns (uint256);

    function passedPeriods() external view returns (uint256);

    // -- Locking & Release Schedule --

    function availableAmount() external view returns (uint256);

    function vestedAmount() external view returns (uint256);

    function releasableAmount() external view returns (uint256);

    function totalOutstandingAmount() external view returns (uint256);

    function surplusAmount() external view returns (uint256);

    // -- Value Transfer --

    function release() external;

    function withdrawSurplus(uint256 _amount) external;

    function revoke() external;
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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