Contract

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.4;

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

interface IVotingToken is IERC20 {
    function delegate(address delegatee) external;
}

/// @title a timelock for tokens allowing for bulk delegation
/// @author Fei Protocol
/// @notice allows the timelocked tokens to be delegated by the beneficiary while locked
contract FixedQuadraticTimelockedDelegatorUpgradeable is FixedQuadraticTokenTimelockUpgradeable {
    /// @notice accept beneficiary role over timelocked TRIBE
    function acceptBeneficiary() public override {
        _setBeneficiary(msg.sender);
    }

    /// @notice delegate all held TRIBE to the `to` address
    function delegate(address to) public onlyBeneficiary {
        IVotingToken(address(lockedToken)).delegate(to);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)

pragma solidity ^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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `from` to `to` 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 from,
        address to,
        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: GPL-3.0-or-later
pragma solidity ^0.8.4;

import "@openzeppelin/contracts/proxy/utils/Initializable.sol";
import "./FixedTokenTimelockUpgradeable.sol";

contract FixedQuadraticTokenTimelockUpgradeable is Initializable, FixedTokenTimelockUpgradeable {

    function initialize(
        address _beneficiary,
        uint256 _duration,
        address _lockedToken,
        uint256 _cliffDuration,
        address _clawbackAdmin,
        uint256 _lockedAmount,
        uint256 _startTime
    ) external initializer {
        __FixedTokenTimelock_init(
            _beneficiary, 
            _duration, 
            _lockedToken, 
            _cliffDuration,
            _clawbackAdmin,
            _lockedAmount
        );

        if (_startTime != 0) {
            startTime = _startTime;
        }
    }

    function _proportionAvailable(
        uint256 initialBalance,
        uint256 elapsed,
        uint256 duration
    ) internal pure override returns (uint256) {
        return initialBalance * elapsed * elapsed / duration / duration;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.0;

import "../../utils/Address.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To initialize the implementation contract, you can either invoke the
 * initializer manually, or you can include a constructor to automatically mark it as initialized when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() initializer {}
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        // If the contract is initializing we ignore whether _initialized is set in order to support multiple
        // inheritance patterns, but we only do this in the context of a constructor, because in other contexts the
        // contract may have been reentered.
        require(_initializing ? _isConstructor() : !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} modifier, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    function _isConstructor() private view returns (bool) {
        return !Address.isContract(address(this));
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.4;

import "./TokenTimelockUpgradeable.sol";

abstract contract FixedTokenTimelockUpgradeable is TokenTimelockUpgradeable {
    /// @notice amount of tokens already claimed
    uint256 public claimedAmount;

    function __FixedTokenTimelock_init(
        address _beneficiary,
        uint256 _duration,
        address _lockedToken,
        uint256 _cliffDuration,
        address _clawbackAdmin,
        uint256 _lockedAmount
    ) internal onlyInitializing {
        __TokenTimelock_init(
            _beneficiary, 
            _duration, 
            _cliffDuration,
            _lockedToken, 
            _clawbackAdmin
        );

        require(_lockedAmount > 0, "FixedTokenTimelock: no amount locked");
        initialBalance = _lockedAmount;
    }

    // Prevents incoming LP tokens from messing up calculations
    modifier balanceCheck() override {
        _;
    }

    /// @notice amount of tokens released to beneficiary
    function alreadyReleasedAmount() public view override returns (uint256) {
        return claimedAmount;
    }

    function _release(address to, uint256 amount) internal override {
        claimedAmount = claimedAmount + amount;
        lockedToken.transfer(to, amount);
        emit Release(beneficiary, to, amount);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @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
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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");

        (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");

        (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");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

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

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

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal 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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.4;

// Inspired by OpenZeppelin TokenTimelock contract
// Reference: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/TokenTimelock.sol

import "@openzeppelin/contracts/proxy/utils/Initializable.sol";
import "../utils/TimedUpgradeable.sol";
import "./ITokenTimelock.sol";

abstract contract TokenTimelockUpgradeable is Initializable, ITokenTimelock, TimedUpgradeable {

    /// @notice ERC20 basic token contract being held in timelock
    IERC20 public override lockedToken;

    /// @notice beneficiary of tokens after they are released
    address public override beneficiary;

    /// @notice pending beneficiary appointed by current beneficiary
    address public override pendingBeneficiary;

    /// @notice initial balance of lockedToken
    uint256 public override initialBalance;

    uint256 internal lastBalance;

    /// @notice number of seconds before releasing is allowed
    uint256 public cliffSeconds;

    address public clawbackAdmin;

    function __TokenTimelock_init(
        address _beneficiary,
        uint256 _duration,
        uint256 _cliffSeconds,
        address _lockedToken,
        address _clawbackAdmin
    ) internal onlyInitializing {
        __Timed_init_unchained(_duration);
        __TokenTimelock_init_unchained(
            _beneficiary,
            _duration,
            _cliffSeconds,
            _lockedToken,
            _clawbackAdmin
        );
    }

    function __TokenTimelock_init_unchained(
        address _beneficiary,
        uint256 _duration,
        uint256 _cliffSeconds,
        address _lockedToken,
        address _clawbackAdmin
    ) internal onlyInitializing {
        require(_duration != 0, "TokenTimelock: duration is 0");
        require(
            _beneficiary != address(0),
            "TokenTimelock: Beneficiary must not be 0 address"
        );

        beneficiary = _beneficiary;
        _initTimed();

        _setLockedToken(_lockedToken);

        cliffSeconds = _cliffSeconds;

        clawbackAdmin = _clawbackAdmin;
    }

    // Prevents incoming LP tokens from messing up calculations
    modifier balanceCheck() virtual {
        if (totalToken() > lastBalance) {
            uint256 delta = totalToken() - lastBalance;
            initialBalance = initialBalance + delta;
        }
        _;
        lastBalance = totalToken();
    }

    modifier onlyBeneficiary() {
        require(
            msg.sender == beneficiary,
            "TokenTimelock: Caller is not a beneficiary"
        );
        _;
    }

    /// @notice releases `amount` unlocked tokens to address `to`
    function release(address to, uint256 amount) external override onlyBeneficiary balanceCheck {
        require(amount != 0, "TokenTimelock: no amount desired");
        require(passedCliff(), "TokenTimelock: Cliff not passed");

        uint256 available = availableForRelease();
        require(amount <= available, "TokenTimelock: not enough released tokens");

        _release(to, amount);
    }

    /// @notice releases maximum unlocked tokens to address `to`
    function releaseMax(address to) external override onlyBeneficiary balanceCheck {
        require(passedCliff(), "TokenTimelock: Cliff not passed");
        _release(to, availableForRelease());
    }

    /// @notice the total amount of tokens held by timelock
    function totalToken() public view override virtual returns (uint256) {
        return lockedToken.balanceOf(address(this));
    }

    /// @notice amount of tokens released to beneficiary
    function alreadyReleasedAmount() public view override virtual returns (uint256) {
        return initialBalance - totalToken();
    }

    /// @notice amount of held tokens unlocked and available for release
    function availableForRelease() public view override returns (uint256) {
        uint256 elapsed = timeSinceStart();

        uint256 totalAvailable = _proportionAvailable(initialBalance, elapsed, duration);
        uint256 netAvailable = totalAvailable - alreadyReleasedAmount();
        return netAvailable;
    }

    /// @notice current beneficiary can appoint new beneficiary, which must be accepted
    function setPendingBeneficiary(address _pendingBeneficiary)
        public
        override
        onlyBeneficiary
    {
        pendingBeneficiary = _pendingBeneficiary;
        emit PendingBeneficiaryUpdate(_pendingBeneficiary);
    }

    /// @notice pending beneficiary accepts new beneficiary
    function acceptBeneficiary() public override virtual {
        _setBeneficiary(msg.sender);
    }

    function clawback() public balanceCheck {
        require(msg.sender == clawbackAdmin, "TokenTimelock: Only clawbackAdmin");
        if (passedCliff()) {
            _release(beneficiary, availableForRelease());
        }
        _release(clawbackAdmin, totalToken());
    }

    function passedCliff() public view returns (bool) {
        return timeSinceStart() >= cliffSeconds;
    }

    function _proportionAvailable(uint256 initialBalance, uint256 elapsed, uint256 duration) internal pure virtual returns (uint256);

    function _setBeneficiary(address newBeneficiary) internal {
        require(
            newBeneficiary == pendingBeneficiary,
            "TokenTimelock: Caller is not pending beneficiary"
        );
        beneficiary = newBeneficiary;
        emit BeneficiaryUpdate(newBeneficiary);
        pendingBeneficiary = address(0);
    }

    function _setLockedToken(address tokenAddress) internal {
        lockedToken = IERC20(tokenAddress);
    }

    function _release(address to, uint256 amount) internal virtual {
        lockedToken.transfer(to, amount);
        emit Release(beneficiary, to, amount);
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.4;

import "@openzeppelin/contracts/proxy/utils/Initializable.sol";

/// @title an abstract contract for timed events
/// @author Fei Protocol
abstract contract TimedUpgradeable is Initializable {

    /// @notice the start timestamp of the timed period
    uint256 public startTime;

    /// @notice the duration of the timed period
    uint256 public duration;

    event DurationUpdate(uint256 oldDuration, uint256 newDuration);

    event TimerReset(uint256 startTime);

    function __Timed_init(uint256 _duration) internal onlyInitializing {
        __Timed_init_unchained(_duration);
    }

    function __Timed_init_unchained(uint256 _duration) internal onlyInitializing {
        _setDuration(_duration);
    }

    modifier duringTime() {
        require(isTimeStarted(), "Timed: time not started");
        require(!isTimeEnded(), "Timed: time ended");
        _;
    }

    modifier afterTime() {
        require(isTimeEnded(), "Timed: time not ended");
        _;
    }

    /// @notice return true if time period has ended
    function isTimeEnded() public view returns (bool) {
        return remainingTime() == 0;
    }

    /// @notice number of seconds remaining until time is up
    /// @return remaining
    function remainingTime() public view returns (uint256) {
        return duration - timeSinceStart(); // duration always >= timeSinceStart which is on [0,d]
    }

    /// @notice number of seconds since contract was initialized
    /// @return timestamp
    /// @dev will be less than or equal to duration
    function timeSinceStart() public view returns (uint256) {
        if (!isTimeStarted()) {
            return 0; // uninitialized
        }
        uint256 _duration = duration;
        uint256 timePassed = block.timestamp - startTime; // block timestamp always >= startTime
        return timePassed > _duration ? _duration : timePassed;
    }

    function isTimeStarted() public view returns (bool) {
        return startTime != 0;
    }

    function _initTimed() internal {
        startTime = block.timestamp;
        
        emit TimerReset(block.timestamp);
    }

    function _setDuration(uint256 newDuration) internal {
        require(newDuration != 0, "Timed: zero duration");

        uint256 oldDuration = duration;
        duration = newDuration;
        emit DurationUpdate(oldDuration, newDuration);
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.4;

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

/// @title TokenTimelock interface
/// @author Fei Protocol
interface ITokenTimelock {
    // ----------- Events -----------

    event Release(address indexed _beneficiary, address indexed _recipient, uint256 _amount);
    event BeneficiaryUpdate(address indexed _beneficiary);
    event PendingBeneficiaryUpdate(address indexed _pendingBeneficiary);

    // ----------- State changing api -----------

    function release(address to, uint256 amount) external;

    function releaseMax(address to) external;

    function setPendingBeneficiary(address _pendingBeneficiary) external;

    function acceptBeneficiary() external;


    // ----------- Getters -----------

    function lockedToken() external view returns (IERC20);

    function beneficiary() external view returns (address);

    function pendingBeneficiary() external view returns (address);

    function initialBalance() external view returns (uint256);

    function availableForRelease() external view returns (uint256);

    function totalToken() external view returns(uint256);

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

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

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