CELO Price: $0.80 (+4.88%)
Gas: 10 GWei

Contract

0x2736B33455A872dC478E1E004106D04c35472468

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0x60a06040222198172023-10-31 15:54:43169 days ago1698767683IN
 Create: Staking
0 CELO0.0345883410

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Contract Source Code Verified (Exact Match)

Contract Name:
Staking

Compiler Version
v0.8.9+commit.e5eed63a

Optimization Enabled:
Yes with 1000000 runs

Other Settings:
default evmVersion
File 1 of 21 : Staking.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2;

import '@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol';
import '@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol';
import '@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol';
import '@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol';

import './interfaces/HMTokenInterface.sol';
import './interfaces/IEscrow.sol';
import './interfaces/IRewardPool.sol';
import './interfaces/IStaking.sol';
import './libs/Stakes.sol';
import './utils/Math.sol';

/**
 * @title Staking contract
 * @dev The Staking contract allows Operator, Exchange Oracle, Recording Oracle and Reputation Oracle to stake to Escrow.
 */
contract Staking is IStaking, OwnableUpgradeable, UUPSUpgradeable {
    using SafeMath for uint256;
    using Stakes for Stakes.Staker;

    // Token address
    address public token;

    // Reward pool address
    address public override rewardPool;

    // Minimum amount of tokens an staker needs to stake
    uint256 public minimumStake;

    // Time in blocks to unstake
    uint32 public lockPeriod;

    // Staker stakes: staker => Stake
    mapping(address => Stakes.Staker) public stakes;

    // List of stakers
    address[] public stakers;

    // Allocations : escrowAddress => Allocation
    mapping(address => IStaking.Allocation) public allocations;

    /**
     * @dev Emitted when `staker` stake `tokens` amount.
     */
    event StakeDeposited(address indexed staker, uint256 tokens);

    /**
     * @dev Emitted when `staker` unstaked and locked `tokens` amount `until` block.
     */
    event StakeLocked(address indexed staker, uint256 tokens, uint256 until);

    /**
     * @dev Emitted when `staker` withdraws `tokens` staked.
     */
    event StakeWithdrawn(address indexed staker, uint256 tokens);

    /**
     * @dev Emitted when `staker` was slashed for a total of `tokens` amount.
     */
    event StakeSlashed(
        address indexed staker,
        uint256 tokens,
        address indexed escrowAddress,
        address slasher
    );

    /**
     * @dev Emitted when `staker` allocated `tokens` amount to `escrowAddress`.
     */
    event StakeAllocated(
        address indexed staker,
        uint256 tokens,
        address indexed escrowAddress,
        uint256 createdAt
    );

    /**
     * @dev Emitted when `staker` close an allocation `escrowAddress`.
     */
    event AllocationClosed(
        address indexed staker,
        uint256 tokens,
        address indexed escrowAddress,
        uint256 closedAt
    );

    /**
     * @dev Emitted when `owner` set new value for `minimumStake`.
     */
    event SetMinumumStake(uint256 indexed minimumStake);

    /**
     * @dev Emitted when `owner` set new value for `lockPeriod`.
     */
    event SetLockPeriod(uint32 indexed lockPeriod);

    /**
     * @dev Emitted when `owner` set new value for `rewardPool`.
     */
    event SetRewardPool(address indexed rewardPool);

    /// @custom:oz-upgrades-unsafe-allow constructor
    constructor() {
        _disableInitializers();
    }

    function initialize(
        address _token,
        uint256 _minimumStake,
        uint32 _lockPeriod
    ) external payable virtual initializer {
        __Ownable_init_unchained();

        __Staking_init_unchained(_token, _minimumStake, _lockPeriod);
    }

    function __Staking_init_unchained(
        address _token,
        uint256 _minimumStake,
        uint32 _lockPeriod
    ) internal onlyInitializing {
        token = _token;
        _setMinimumStake(_minimumStake);
        _setLockPeriod(_lockPeriod);
    }

    /**
     * @dev Set the minimum stake amount.
     * @param _minimumStake Minimum stake
     */
    function setMinimumStake(
        uint256 _minimumStake
    ) external override onlyOwner {
        _setMinimumStake(_minimumStake);
    }

    /**
     * @dev Set the minimum stake amount.
     * @param _minimumStake Minimum stake
     */
    function _setMinimumStake(uint256 _minimumStake) private {
        require(_minimumStake > 0, 'Must be a positive number');
        minimumStake = _minimumStake;
        emit SetMinumumStake(minimumStake);
    }

    /**
     * @dev Set the lock period for unstaking.
     * @param _lockPeriod Period in blocks to wait for token withdrawals after unstaking
     */
    function setLockPeriod(uint32 _lockPeriod) external override onlyOwner {
        _setLockPeriod(_lockPeriod);
    }

    /**
     * @dev Set the lock period for unstaking.
     * @param _lockPeriod Period in blocks to wait for token withdrawals after unstaking
     */
    function _setLockPeriod(uint32 _lockPeriod) private {
        require(_lockPeriod > 0, 'Must be a positive number');
        lockPeriod = _lockPeriod;
        emit SetLockPeriod(lockPeriod);
    }

    /**
     * @dev Set the destionations of the rewards.
     * @param _rewardPool Reward pool address
     */
    function setRewardPool(address _rewardPool) external override onlyOwner {
        _setRewardPool(_rewardPool);
    }

    /**
     * @dev Set the destionations of the rewards.
     * @param _rewardPool Reward pool address
     */
    function _setRewardPool(address _rewardPool) private {
        require(_rewardPool != address(0), 'Must be a valid address');
        rewardPool = _rewardPool;
        emit SetRewardPool(_rewardPool);
    }

    /**
     * @dev Return if escrowAddress is use for allocation.
     * @param _escrowAddress Address used as signer by the staker for an allocation
     * @return True if _escrowAddress already used
     */
    function isAllocation(
        address _escrowAddress
    ) external view override returns (bool) {
        return _getAllocationState(_escrowAddress) != AllocationState.Null;
    }

    /**
     * @dev Getter that returns if an staker has any stake.
     * @param _staker Address of the staker
     * @return True if staker has staked tokens
     */
    function hasStake(address _staker) external view override returns (bool) {
        return stakes[_staker].tokensStaked > 0;
    }

    /**
     * @dev Getter that returns if an staker has any available stake.
     * @param _staker Address of the staker
     * @return True if staker has available tokens staked
     */
    function hasAvailableStake(
        address _staker
    ) external view override returns (bool) {
        return stakes[_staker].tokensAvailable() > 0;
    }

    /**
     * @dev Return the allocation by escrow address.
     * @param _escrowAddress Address used as allocation identifier
     * @return Allocation data
     */
    function getAllocation(
        address _escrowAddress
    ) external view override returns (Allocation memory) {
        return _getAllocation(_escrowAddress);
    }

    /**
     * @dev Return the allocation by job ID.
     * @param _escrowAddress Address used as allocation identifier
     * @return Allocation data
     */
    function _getAllocation(
        address _escrowAddress
    ) private view returns (Allocation memory) {
        return allocations[_escrowAddress];
    }

    /**
     * @dev Return the current state of an allocation.
     * @param _escrowAddress Address used as the allocation identifier
     * @return AllocationState
     */
    function getAllocationState(
        address _escrowAddress
    ) external view override returns (AllocationState) {
        return _getAllocationState(_escrowAddress);
    }

    /**
     * @dev Return the current state of an allocation, partially depends on job status
     * @param _escrowAddress Job identifier (Escrow address)
     * @return AllocationState
     */
    function _getAllocationState(
        address _escrowAddress
    ) private view returns (AllocationState) {
        Allocation storage allocation = allocations[_escrowAddress];

        if (allocation.staker == address(0)) {
            return AllocationState.Null;
        }

        IEscrow escrow = IEscrow(_escrowAddress);
        IEscrow.EscrowStatuses escrowStatus = escrow.status();

        if (
            allocation.createdAt != 0 &&
            allocation.tokens > 0 &&
            escrowStatus == IEscrow.EscrowStatuses.Pending
        ) {
            return AllocationState.Pending;
        }

        if (
            allocation.closedAt == 0 &&
            escrowStatus == IEscrow.EscrowStatuses.Launched
        ) {
            return AllocationState.Active;
        }

        if (
            allocation.closedAt == 0 &&
            (escrowStatus == IEscrow.EscrowStatuses.Complete ||
                escrowStatus == IEscrow.EscrowStatuses.Cancelled)
        ) {
            return AllocationState.Completed;
        }

        return AllocationState.Closed;
    }

    /**
     * @dev Get the total amount of tokens staked by the staker.
     * @param _staker Address of the staker
     * @return Amount of tokens staked by the staker
     */
    function getStakedTokens(
        address _staker
    ) external view override returns (uint256) {
        return stakes[_staker].tokensStaked;
    }

    /**
     * @dev Get staker data by the staker address.
     * @param _staker Address of the staker
     * @return Staker's data
     */
    function getStaker(
        address _staker
    ) external view override returns (Stakes.Staker memory) {
        return stakes[_staker];
    }

    /**
     * @dev Get list of stakers
     * @return List of staker's addresses, and stake data
     */
    function getListOfStakers()
        external
        view
        override
        returns (address[] memory, Stakes.Staker[] memory)
    {
        address[] memory _stakerAddresses = stakers;
        uint256 _stakersCount = _stakerAddresses.length;

        if (_stakersCount == 0) {
            return (new address[](0), new Stakes.Staker[](0));
        }

        Stakes.Staker[] memory _stakers = new Stakes.Staker[](_stakersCount);

        for (uint256 _i = 0; _i < _stakersCount; _i++) {
            _stakers[_i] = stakes[_stakerAddresses[_i]];
        }

        return (_stakerAddresses, _stakers);
    }

    /**
     * @dev Deposit tokens on the staker stake.
     * @param _tokens Amount of tokens to stake
     */
    function stake(uint256 _tokens) external override {
        require(_tokens > 0, 'Must be a positive number');

        Stakes.Staker memory staker = stakes[msg.sender];
        require(
            staker.tokensSecureStake().add(_tokens) >= minimumStake,
            'Total stake is below the minimum threshold'
        );

        if (staker.tokensStaked == 0) {
            staker = Stakes.Staker(0, 0, 0, 0);
            stakes[msg.sender] = staker;
            stakers.push(msg.sender);
        }

        _safeTransferFrom(msg.sender, address(this), _tokens);

        stakes[msg.sender].deposit(_tokens);

        emit StakeDeposited(msg.sender, _tokens);
    }

    /**
     * @dev Unstake tokens from the staker stake, lock them until lock period expires.
     * @param _tokens Amount of tokens to unstake
     */
    function unstake(uint256 _tokens) external override {
        Stakes.Staker storage staker = stakes[msg.sender];

        require(_tokens > 0, 'Must be a positive number');
        require(
            staker.tokensAvailable() >= _tokens,
            'Insufficient amount to unstake'
        );

        uint256 newStake = staker.tokensSecureStake().sub(_tokens);
        require(
            newStake == 0 || newStake >= minimumStake,
            'Total stake is below the minimum threshold'
        );

        uint256 tokensToWithdraw = staker.tokensWithdrawable();
        if (tokensToWithdraw > 0) {
            _withdraw(msg.sender);
        }

        staker.lockTokens(_tokens, lockPeriod);

        emit StakeLocked(
            msg.sender,
            staker.tokensLocked,
            staker.tokensLockedUntil
        );
    }

    /**
     * @dev Withdraw staker tokens based on the locking period.
     */
    function withdraw() external override {
        _withdraw(msg.sender);
    }

    /**
     * @dev Withdraw staker tokens once the lock period has passed.
     * @param _staker Address of staker to withdraw funds from
     */
    function _withdraw(address _staker) private {
        uint256 tokensToWithdraw = stakes[_staker].withdrawTokens();
        require(
            tokensToWithdraw > 0,
            'Stake has no available tokens for withdrawal'
        );

        _safeTransfer(_staker, tokensToWithdraw);

        emit StakeWithdrawn(_staker, tokensToWithdraw);
    }

    /**
     * @dev Slash the staker stake allocated to the escrow.
     * @param _staker Address of staker to slash
     * @param _escrowAddress Escrow address
     * @param _tokens Amount of tokens to slash from the indexer stake
     */
    function slash(
        address _slasher,
        address _staker,
        address _escrowAddress,
        uint256 _tokens
    ) external override onlyOwner {
        require(_escrowAddress != address(0), 'Must be a valid address');

        Stakes.Staker storage staker = stakes[_staker];

        Allocation storage allocation = allocations[_escrowAddress];

        require(_tokens > 0, 'Must be a positive number');

        require(
            _tokens <= allocation.tokens,
            'Slash tokens exceed allocated ones'
        );

        staker.unallocate(_tokens);
        allocation.tokens = allocation.tokens.sub(_tokens);

        staker.release(_tokens);

        _safeTransfer(rewardPool, _tokens);

        // Keep record on Reward Pool
        IRewardPool(rewardPool).addReward(
            _escrowAddress,
            _staker,
            _slasher,
            _tokens
        );

        emit StakeSlashed(_staker, _tokens, _escrowAddress, _slasher);
    }

    /**
     * @dev Allocate available tokens to an escrow.
     * @param _escrowAddress The allocationID will work to identify collected funds related to this allocation
     * @param _tokens Amount of tokens to allocate
     */
    function allocate(
        address _escrowAddress,
        uint256 _tokens
    ) external override {
        _allocate(msg.sender, _escrowAddress, _tokens);
    }

    /**
     * @dev Allocate available tokens to an escrow.
     * @param _staker Staker address to allocate funds from.
     * @param _escrowAddress The escrow address which collected funds related to this allocation
     * @param _tokens Amount of tokens to allocate
     */
    function _allocate(
        address _staker,
        address _escrowAddress,
        uint256 _tokens
    ) private {
        require(_escrowAddress != address(0), 'Must be a valid address');
        require(
            stakes[msg.sender].tokensAvailable() >= _tokens,
            'Insufficient amount of tokens in the stake'
        );
        require(_tokens > 0, 'Must be a positive number');
        require(
            _getAllocationState(_escrowAddress) == AllocationState.Null,
            'Allocation already exists'
        );

        Allocation memory allocation = Allocation(
            _escrowAddress, // Escrow address
            _staker, // Staker address
            _tokens, // Tokens allocated
            block.number, // createdAt
            0 // closedAt
        );

        allocations[_escrowAddress] = allocation;
        stakes[_staker].allocate(allocation.tokens);

        emit StakeAllocated(
            _staker,
            allocation.tokens,
            _escrowAddress,
            allocation.createdAt
        );
    }

    /**
     * @dev Close an allocation and free the staked tokens.
     * @param _escrowAddress The allocation identifier
     */
    function closeAllocation(address _escrowAddress) external override {
        require(_escrowAddress != address(0), 'Must be a valid address');

        _closeAllocation(_escrowAddress);
    }

    /**
     * @dev Close an allocation and free the staked tokens.
     * @param _escrowAddress The allocation identifier
     */
    function _closeAllocation(address _escrowAddress) private {
        Allocation storage allocation = allocations[_escrowAddress];
        require(
            allocation.staker == msg.sender,
            'Only the allocator can close the allocation'
        );

        AllocationState allocationState = _getAllocationState(_escrowAddress);
        require(
            allocationState == AllocationState.Completed,
            'Allocation has no completed state'
        );

        allocation.closedAt = block.number;
        uint256 diffInBlocks = Math.diffOrZero(
            allocation.closedAt,
            allocation.createdAt
        );
        require(diffInBlocks > 0, 'Allocation cannot be closed so early');

        uint256 _tokens = allocation.tokens;

        stakes[allocation.staker].unallocate(_tokens);
        allocation.tokens = 0;

        emit AllocationClosed(
            allocation.staker,
            _tokens,
            _escrowAddress,
            allocation.closedAt
        );
    }

    function _safeTransfer(address to, uint256 value) internal {
        SafeERC20Upgradeable.safeTransfer(IERC20Upgradeable(token), to, value);
    }

    function _safeTransferFrom(
        address from,
        address to,
        uint256 value
    ) internal {
        SafeERC20Upgradeable.safeTransferFrom(
            IERC20Upgradeable(token),
            from,
            to,
            value
        );
    }

    // solhint-disable-next-line no-empty-blocks
    function _authorizeUpgrade(address) internal override onlyOwner {}

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[43] private __gap;
}

File 1 of 21 : OwnableUpgradeable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";

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

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal onlyInitializing {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

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

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

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

File 1 of 21 : draft-IERC1822Upgradeable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (interfaces/draft-IERC1822.sol)

pragma solidity ^0.8.0;

/**
 * @dev ERC1822: Universal Upgradeable Proxy Standard (UUPS) documents a method for upgradeability through a simplified
 * proxy whose upgrades are fully controlled by the current implementation.
 */
interface IERC1822ProxiableUpgradeable {
    /**
     * @dev Returns the storage slot that the proxiable contract assumes is being used to store the implementation
     * address.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy.
     */
    function proxiableUUID() external view returns (bytes32);
}

File 1 of 21 : IERC1967Upgradeable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (interfaces/IERC1967.sol)

pragma solidity ^0.8.0;

/**
 * @dev ERC-1967: Proxy Storage Slots. This interface contains the events defined in the ERC.
 *
 * _Available since v4.8.3._
 */
interface IERC1967Upgradeable {
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);

    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);

    /**
     * @dev Emitted when the beacon is changed.
     */
    event BeaconUpgraded(address indexed beacon);
}

File 1 of 21 : IBeaconUpgradeable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)

pragma solidity ^0.8.0;

/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeaconUpgradeable {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}

File 1 of 21 : ERC1967UpgradeUpgradeable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (proxy/ERC1967/ERC1967Upgrade.sol)

pragma solidity ^0.8.2;

import "../beacon/IBeaconUpgradeable.sol";
import "../../interfaces/IERC1967Upgradeable.sol";
import "../../interfaces/draft-IERC1822Upgradeable.sol";
import "../../utils/AddressUpgradeable.sol";
import "../../utils/StorageSlotUpgradeable.sol";
import "../utils/Initializable.sol";

/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 */
abstract contract ERC1967UpgradeUpgradeable is Initializable, IERC1967Upgradeable {
    function __ERC1967Upgrade_init() internal onlyInitializing {
    }

    function __ERC1967Upgrade_init_unchained() internal onlyInitializing {
    }
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;

    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlotUpgradeable.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(AddressUpgradeable.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlotUpgradeable.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }

    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }

    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(address newImplementation, bytes memory data, bool forceCall) internal {
        _upgradeTo(newImplementation);
        if (data.length > 0 || forceCall) {
            AddressUpgradeable.functionDelegateCall(newImplementation, data);
        }
    }

    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallUUPS(address newImplementation, bytes memory data, bool forceCall) internal {
        // Upgrades from old implementations will perform a rollback test. This test requires the new
        // implementation to upgrade back to the old, non-ERC1822 compliant, implementation. Removing
        // this special case will break upgrade paths from old UUPS implementation to new ones.
        if (StorageSlotUpgradeable.getBooleanSlot(_ROLLBACK_SLOT).value) {
            _setImplementation(newImplementation);
        } else {
            try IERC1822ProxiableUpgradeable(newImplementation).proxiableUUID() returns (bytes32 slot) {
                require(slot == _IMPLEMENTATION_SLOT, "ERC1967Upgrade: unsupported proxiableUUID");
            } catch {
                revert("ERC1967Upgrade: new implementation is not UUPS");
            }
            _upgradeToAndCall(newImplementation, data, forceCall);
        }
    }

    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;

    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlotUpgradeable.getAddressSlot(_ADMIN_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlotUpgradeable.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }

    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }

    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;

    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlotUpgradeable.getAddressSlot(_BEACON_SLOT).value;
    }

    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(AddressUpgradeable.isContract(newBeacon), "ERC1967: new beacon is not a contract");
        require(
            AddressUpgradeable.isContract(IBeaconUpgradeable(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlotUpgradeable.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }

    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(address newBeacon, bytes memory data, bool forceCall) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            AddressUpgradeable.functionDelegateCall(IBeaconUpgradeable(newBeacon).implementation(), data);
        }
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

File 1 of 21 : Initializable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/AddressUpgradeable.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.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```solidity
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 *
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * 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 prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

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

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: setting the version to 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

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

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized != type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _initializing;
    }
}

File 1 of 21 : UUPSUpgradeable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (proxy/utils/UUPSUpgradeable.sol)

pragma solidity ^0.8.0;

import "../../interfaces/draft-IERC1822Upgradeable.sol";
import "../ERC1967/ERC1967UpgradeUpgradeable.sol";
import "./Initializable.sol";

/**
 * @dev An upgradeability mechanism designed for UUPS proxies. The functions included here can perform an upgrade of an
 * {ERC1967Proxy}, when this contract is set as the implementation behind such a proxy.
 *
 * A security mechanism ensures that an upgrade does not turn off upgradeability accidentally, although this risk is
 * reinstated if the upgrade retains upgradeability but removes the security mechanism, e.g. by replacing
 * `UUPSUpgradeable` with a custom implementation of upgrades.
 *
 * The {_authorizeUpgrade} function must be overridden to include access restriction to the upgrade mechanism.
 *
 * _Available since v4.1._
 */
abstract contract UUPSUpgradeable is Initializable, IERC1822ProxiableUpgradeable, ERC1967UpgradeUpgradeable {
    function __UUPSUpgradeable_init() internal onlyInitializing {
    }

    function __UUPSUpgradeable_init_unchained() internal onlyInitializing {
    }
    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable state-variable-assignment
    address private immutable __self = address(this);

    /**
     * @dev Check that the execution is being performed through a delegatecall call and that the execution context is
     * a proxy contract with an implementation (as defined in ERC1967) pointing to self. This should only be the case
     * for UUPS and transparent proxies that are using the current contract as their implementation. Execution of a
     * function through ERC1167 minimal proxies (clones) would not normally pass this test, but is not guaranteed to
     * fail.
     */
    modifier onlyProxy() {
        require(address(this) != __self, "Function must be called through delegatecall");
        require(_getImplementation() == __self, "Function must be called through active proxy");
        _;
    }

    /**
     * @dev Check that the execution is not being performed through a delegate call. This allows a function to be
     * callable on the implementing contract but not through proxies.
     */
    modifier notDelegated() {
        require(address(this) == __self, "UUPSUpgradeable: must not be called through delegatecall");
        _;
    }

    /**
     * @dev Implementation of the ERC1822 {proxiableUUID} function. This returns the storage slot used by the
     * implementation. It is used to validate the implementation's compatibility when performing an upgrade.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy. This is guaranteed by the `notDelegated` modifier.
     */
    function proxiableUUID() external view virtual override notDelegated returns (bytes32) {
        return _IMPLEMENTATION_SLOT;
    }

    /**
     * @dev Upgrade the implementation of the proxy to `newImplementation`.
     *
     * Calls {_authorizeUpgrade}.
     *
     * Emits an {Upgraded} event.
     *
     * @custom:oz-upgrades-unsafe-allow-reachable delegatecall
     */
    function upgradeTo(address newImplementation) public virtual onlyProxy {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallUUPS(newImplementation, new bytes(0), false);
    }

    /**
     * @dev Upgrade the implementation of the proxy to `newImplementation`, and subsequently execute the function call
     * encoded in `data`.
     *
     * Calls {_authorizeUpgrade}.
     *
     * Emits an {Upgraded} event.
     *
     * @custom:oz-upgrades-unsafe-allow-reachable delegatecall
     */
    function upgradeToAndCall(address newImplementation, bytes memory data) public payable virtual onlyProxy {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallUUPS(newImplementation, data, true);
    }

    /**
     * @dev Function that should revert when `msg.sender` is not authorized to upgrade the contract. Called by
     * {upgradeTo} and {upgradeToAndCall}.
     *
     * Normally, this function will use an xref:access.adoc[access control] modifier such as {Ownable-onlyOwner}.
     *
     * ```solidity
     * function _authorizeUpgrade(address) internal override onlyOwner {}
     * ```
     */
    function _authorizeUpgrade(address newImplementation) internal virtual;

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

File 1 of 21 : IERC20PermitUpgradeable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20PermitUpgradeable {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

File 1 of 21 : IERC20Upgradeable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @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);

    /**
     * @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);
}

File 1 of 21 : SafeERC20Upgradeable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20Upgradeable.sol";
import "../extensions/IERC20PermitUpgradeable.sol";
import "../../../utils/AddressUpgradeable.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 SafeERC20Upgradeable {
    using AddressUpgradeable for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20Upgradeable token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20Upgradeable 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(IERC20Upgradeable 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'
        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));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20Upgradeable token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20Upgradeable token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20Upgradeable token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20PermitUpgradeable token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @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(IERC20Upgradeable 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");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @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).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20Upgradeable token, bytes memory data) private returns (bool) {
        // 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 cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && AddressUpgradeable.isContract(address(token));
    }
}

File 1 of 21 : AddressUpgradeable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @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
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [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://consensys.net/diligence/blog/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/v0.8.0/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 functionCallWithValue(target, data, 0, "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");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or 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 {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // 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
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

File 1 of 21 : ContextUpgradeable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";

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

    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

File 1 of 21 : StorageSlotUpgradeable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/StorageSlot.sol)
// This file was procedurally generated from scripts/generate/templates/StorageSlot.js.

pragma solidity ^0.8.0;

/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```solidity
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, `uint256`._
 * _Available since v4.9 for `string`, `bytes`._
 */
library StorageSlotUpgradeable {
    struct AddressSlot {
        address value;
    }

    struct BooleanSlot {
        bool value;
    }

    struct Bytes32Slot {
        bytes32 value;
    }

    struct Uint256Slot {
        uint256 value;
    }

    struct StringSlot {
        string value;
    }

    struct BytesSlot {
        bytes value;
    }

    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `StringSlot` with member `value` located at `slot`.
     */
    function getStringSlot(bytes32 slot) internal pure returns (StringSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `StringSlot` representation of the string storage pointer `store`.
     */
    function getStringSlot(string storage store) internal pure returns (StringSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := store.slot
        }
    }

    /**
     * @dev Returns an `BytesSlot` with member `value` located at `slot`.
     */
    function getBytesSlot(bytes32 slot) internal pure returns (BytesSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BytesSlot` representation of the bytes storage pointer `store`.
     */
    function getBytesSlot(bytes storage store) internal pure returns (BytesSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := store.slot
        }
    }
}

File 1 of 21 : HMTokenInterface.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2;

interface HMTokenInterface {
    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(
        address indexed _owner,
        address indexed _spender,
        uint256 _value
    );

    /// @param _owner The address from which the balance will be retrieved
    /// @return balance The balance
    function balanceOf(address _owner) external view returns (uint256 balance);

    /// @notice send `_value` token to `_to` from `msg.sender`
    /// @param _to The address of the recipient
    /// @param _value The amount of token to be transferred
    /// @return success Whether the transfer was successful or not
    function transfer(
        address _to,
        uint256 _value
    ) external returns (bool success);

    /// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from`
    /// @param _from The address of the sender
    /// @param _to The address of the recipient
    /// @param _value The amount of token to be transferred
    /// @return success Whether the transfer was successful or not
    function transferFrom(
        address _from,
        address _to,
        uint256 _value
    ) external returns (bool success);

    function transferBulk(
        address[] calldata _tos,
        uint256[] calldata _values,
        uint256 _txId
    ) external returns (uint256 _bulkCount);

    /// @notice `msg.sender` approves `_spender` to spend `_value` tokens
    /// @param _spender The address of the account able to transfer the tokens
    /// @param _value The amount of tokens to be approved for transfer
    /// @return success Whether the approval was successful or not
    function approve(
        address _spender,
        uint256 _value
    ) external returns (bool success);

    /// @param _owner The address of the account owning tokens
    /// @param _spender The address of the account able to transfer the tokens
    /// @return remaining Amount of remaining tokens allowed to spent
    function allowance(
        address _owner,
        address _spender
    ) external view returns (uint256 remaining);
}

File 1 of 21 : IEscrow.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2;

interface IEscrow {
    enum EscrowStatuses {
        Launched,
        Pending,
        Partial,
        Paid,
        Complete,
        Cancelled
    }

    function status() external view returns (EscrowStatuses);

    function addTrustedHandlers(address[] memory _handlers) external;

    function setup(
        address _reputationOracle,
        address _recordingOracle,
        address _exchangeOracle,
        uint8 _reputationOracleFeePercentage,
        uint8 _recordingOracleFeePercentage,
        uint8 _exchangeOracleFeePercentage,
        string memory _url,
        string memory _hash
    ) external;

    function abort() external;

    function cancel() external returns (bool);

    function complete() external;

    function storeResults(string memory _url, string memory _hash) external;

    function bulkPayOut(
        address[] memory _recipients,
        uint256[] memory _amounts,
        string memory _url,
        string memory _hash,
        uint256 _txId
    ) external;
}

File 1 of 21 : IRewardPool.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2;

interface IRewardPool {
    /**
     * @dev Keep track of slashers how much they slashed per allocations
     */
    struct Reward {
        address escrowAddress;
        address slasher;
        uint256 tokens; // Tokens allocated to a escrowAddress
    }

    function addReward(
        address _escrowAddress,
        address _staker,
        address _slasher,
        uint256 _tokens
    ) external;

    function getRewards(
        address _escrowAddress
    ) external view returns (Reward[] memory);

    function distributeReward(address _escrowAddress) external;

    function withdraw(address to) external;
}

File 1 of 21 : IStaking.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2;

import '../libs/Stakes.sol';

interface IStaking {
    /**
     * @dev Possible states an allocation can be
     * States:
     * - Null = Staker == address(0)
     * - Pending = not Null && tokens > 0 && escrowAddress status == Pending
     * - Active = Pending && escrowAddress status == Launched
     * - Closed = Active && closedAt != 0
     * - Completed = Closed && closedAt && escrowAddress status == Complete
     */
    enum AllocationState {
        Null,
        Pending,
        Active,
        Closed,
        Completed
    }

    /**
     * @dev Possible sort fields
     * Fields:
     * - None = Do not sort
     * - Stake = Sort by stake amount
     */
    enum SortField {
        None,
        Stake
    }

    /**
     * @dev Allocate HMT tokens for the purpose of serving queries of a subgraph deployment
     * An allocation is created in the allocate() function and consumed in claim()
     */
    struct Allocation {
        address escrowAddress;
        address staker;
        uint256 tokens; // Tokens allocated to a escrowAddress
        uint256 createdAt; // Time when allocation was created
        uint256 closedAt; // Time when allocation was closed
    }

    function rewardPool() external view returns (address);

    function setMinimumStake(uint256 _minimumStake) external;

    function setLockPeriod(uint32 _lockPeriod) external;

    function setRewardPool(address _rewardPool) external;

    function isAllocation(address _escrowAddress) external view returns (bool);

    function hasStake(address _indexer) external view returns (bool);

    function hasAvailableStake(address _indexer) external view returns (bool);

    function getAllocation(
        address _escrowAddress
    ) external view returns (Allocation memory);

    function getAllocationState(
        address _escrowAddress
    ) external view returns (AllocationState);

    function getStakedTokens(address _staker) external view returns (uint256);

    function getStaker(
        address _staker
    ) external view returns (Stakes.Staker memory);

    function stake(uint256 _tokens) external;

    function unstake(uint256 _tokens) external;

    function withdraw() external;

    function slash(
        address _slasher,
        address _staker,
        address _escrowAddress,
        uint256 _tokens
    ) external;

    function allocate(address escrowAddress, uint256 _tokens) external;

    function closeAllocation(address _escrowAddress) external;

    function getListOfStakers()
        external
        view
        returns (address[] memory, Stakes.Staker[] memory);
}

File 1 of 21 : Stakes.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2;

import '../utils/SafeMath.sol';
import '../utils/Math.sol';

/**
 * @title Structures, methods and data are available to manage the staker state.
 */
library Stakes {
    using SafeMath for uint256;
    using Stakes for Stakes.Staker;

    struct Staker {
        uint256 tokensStaked; // Tokens staked by the Staker
        uint256 tokensAllocated; // Tokens allocated for jobs
        uint256 tokensLocked; // Tokens locked for withdrawal
        uint256 tokensLockedUntil; // Tokens locked until time
    }

    /**
     * @dev Deposit tokens to the staker stake.
     * @param stake Staker struct
     * @param _tokens Amount of tokens to deposit
     */
    function deposit(Stakes.Staker storage stake, uint256 _tokens) internal {
        stake.tokensStaked = stake.tokensStaked.add(_tokens);
    }

    /**
     * @dev Release tokens from the staker stake.
     * @param stake Staker struct
     * @param _tokens Amount of tokens to release
     */
    function release(Stakes.Staker storage stake, uint256 _tokens) internal {
        stake.tokensStaked = stake.tokensStaked.sub(_tokens);
    }

    /**
     * @dev Add tokens from the main stack to tokensAllocated.
     * @param stake Staker struct
     * @param _tokens Amount of tokens to allocate
     */
    function allocate(Stakes.Staker storage stake, uint256 _tokens) internal {
        stake.tokensAllocated = stake.tokensAllocated.add(_tokens);
    }

    /**
     * @dev Unallocate tokens from a escrowAddress back to the main stack.
     * @param stake Staker struct
     * @param _tokens Amount of tokens to unallocate
     */
    function unallocate(Stakes.Staker storage stake, uint256 _tokens) internal {
        stake.tokensAllocated = stake.tokensAllocated.sub(_tokens);
    }

    /**
     * @dev Lock tokens until a lock period pass.
     * @param stake Staker struct
     * @param _tokens Amount of tokens to unstake
     * @param _period Period in blocks that need to pass before withdrawal
     */
    function lockTokens(
        Stakes.Staker storage stake,
        uint256 _tokens,
        uint256 _period
    ) internal {
        uint256 lockingPeriod = _period;

        if (stake.tokensLocked > 0) {
            lockingPeriod = Math.weightedAverage(
                Math.diffOrZero(stake.tokensLockedUntil, block.number), // Remaining lock period
                stake.tokensLocked,
                _period,
                _tokens
            );
        }

        stake.tokensLocked = stake.tokensLocked.add(_tokens);
        stake.tokensLockedUntil = block.number.add(lockingPeriod);
    }

    /**
     * @dev Unlock tokens.
     * @param stake Staker struct
     * @param _tokens Amount of tokens to unkock
     */
    function unlockTokens(
        Stakes.Staker storage stake,
        uint256 _tokens
    ) internal {
        stake.tokensLocked = stake.tokensLocked.sub(_tokens);
        if (stake.tokensLocked == 0) {
            stake.tokensLockedUntil = 0;
        }
    }

    /**
     * @dev Return all tokens available for withdrawal.
     * @param stake Staker struct
     * @return Amount of tokens available for withdrawal
     */
    function withdrawTokens(
        Stakes.Staker storage stake
    ) internal returns (uint256) {
        uint256 tokensToWithdraw = stake.tokensWithdrawable();

        if (tokensToWithdraw > 0) {
            stake.unlockTokens(tokensToWithdraw);
            stake.release(tokensToWithdraw);
        }

        return tokensToWithdraw;
    }

    /**
     * @dev Return all tokens available in stake.
     * @param stake Staker struct
     * @return Token amount
     */
    function tokensAvailable(
        Stakes.Staker memory stake
    ) internal pure returns (uint256) {
        return stake.tokensStaked.sub(stake.tokensUsed());
    }

    /**
     * @dev Return all tokens used in allocations and locked for withdrawal.
     * @param stake Staker struct
     * @return Token amount
     */
    function tokensUsed(
        Stakes.Staker memory stake
    ) internal pure returns (uint256) {
        return stake.tokensAllocated.add(stake.tokensLocked);
    }

    /**
     * @dev Return the amount of tokens staked which are not locked.
     * @param stake Staker struct
     * @return Token amount
     */
    function tokensSecureStake(
        Stakes.Staker memory stake
    ) internal pure returns (uint256) {
        return stake.tokensStaked.sub(stake.tokensLocked);
    }

    /**
     * @dev Tokens available for withdrawal after lock period.
     * @param stake Staker struct
     * @return Token amount
     */
    function tokensWithdrawable(
        Stakes.Staker memory stake
    ) internal view returns (uint256) {
        if (
            stake.tokensLockedUntil == 0 ||
            block.number < stake.tokensLockedUntil
        ) {
            return 0;
        }
        return stake.tokensLocked;
    }
}

File 2 of 21 : Math.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2;

import './SafeMath.sol';

/**
 * @title Math Library
 * @notice A collection of functions to perform math operations
 */
library Math {
    using SafeMath for uint256;

    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

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

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

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

    /**
     * @dev Calculates the weighted average of two values pondering each of these
     * values based on configured weights. The contribution of each value N is
     * weightN/(weightA + weightB).
     * @param valueA The amount for value A
     * @param weightA The weight to use for value A
     * @param valueB The amount for value B
     * @param weightB The weight to use for value B
     */
    function weightedAverage(
        uint256 valueA,
        uint256 weightA,
        uint256 valueB,
        uint256 weightB
    ) internal pure returns (uint256) {
        return
            valueA.mul(weightA).add(valueB.mul(weightB)).div(
                weightA.add(weightB)
            );
    }

    /**
     * @dev Returns the difference between two numbers or zero if negative.
     */
    function diffOrZero(uint256 x, uint256 y) internal pure returns (uint256) {
        return (x > y) ? x.sub(y) : 0;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10 ** 64) {
                value /= 10 ** 64;
                result += 64;
            }
            if (value >= 10 ** 32) {
                value /= 10 ** 32;
                result += 32;
            }
            if (value >= 10 ** 16) {
                value /= 10 ** 16;
                result += 16;
            }
            if (value >= 10 ** 8) {
                value /= 10 ** 8;
                result += 8;
            }
            if (value >= 10 ** 4) {
                value /= 10 ** 4;
                result += 4;
            }
            if (value >= 10 ** 2) {
                value /= 10 ** 2;
                result += 2;
            }
            if (value >= 10 ** 1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(
        uint256 value,
        Rounding rounding
    ) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return
                result +
                (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(
        uint256 value,
        Rounding rounding
    ) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return
                result +
                (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0);
        }
    }
}

File 2 of 21 : SafeMath.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2;

/**
 * @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;
    }
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"previousAdmin","type":"address"},{"indexed":false,"internalType":"address","name":"newAdmin","type":"address"}],"name":"AdminChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"staker","type":"address"},{"indexed":false,"internalType":"uint256","name":"tokens","type":"uint256"},{"indexed":true,"internalType":"address","name":"escrowAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"closedAt","type":"uint256"}],"name":"AllocationClosed","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"beacon","type":"address"}],"name":"BeaconUpgraded","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint8","name":"version","type":"uint8"}],"name":"Initialized","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint32","name":"lockPeriod","type":"uint32"}],"name":"SetLockPeriod","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"minimumStake","type":"uint256"}],"name":"SetMinumumStake","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"rewardPool","type":"address"}],"name":"SetRewardPool","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"staker","type":"address"},{"indexed":false,"internalType":"uint256","name":"tokens","type":"uint256"},{"indexed":true,"internalType":"address","name":"escrowAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"createdAt","type":"uint256"}],"name":"StakeAllocated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"staker","type":"address"},{"indexed":false,"internalType":"uint256","name":"tokens","type":"uint256"}],"name":"StakeDeposited","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"staker","type":"address"},{"indexed":false,"internalType":"uint256","name":"tokens","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"until","type":"uint256"}],"name":"StakeLocked","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"staker","type":"address"},{"indexed":false,"internalType":"uint256","name":"tokens","type":"uint256"},{"indexed":true,"internalType":"address","name":"escrowAddress","type":"address"},{"indexed":false,"internalType":"address","name":"slasher","type":"address"}],"name":"StakeSlashed","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"staker","type":"address"},{"indexed":false,"internalType":"uint256","name":"tokens","type":"uint256"}],"name":"StakeWithdrawn","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"implementation","type":"address"}],"name":"Upgraded","type":"event"},{"inputs":[{"internalType":"address","name":"_escrowAddress","type":"address"},{"internalType":"uint256","name":"_tokens","type":"uint256"}],"name":"allocate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"allocations","outputs":[{"internalType":"address","name":"escrowAddress","type":"address"},{"internalType":"address","name":"staker","type":"address"},{"internalType":"uint256","name":"tokens","type":"uint256"},{"internalType":"uint256","name":"createdAt","type":"uint256"},{"internalType":"uint256","name":"closedAt","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_escrowAddress","type":"address"}],"name":"closeAllocation","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_escrowAddress","type":"address"}],"name":"getAllocation","outputs":[{"components":[{"internalType":"address","name":"escrowAddress","type":"address"},{"internalType":"address","name":"staker","type":"address"},{"internalType":"uint256","name":"tokens","type":"uint256"},{"internalType":"uint256","name":"createdAt","type":"uint256"},{"internalType":"uint256","name":"closedAt","type":"uint256"}],"internalType":"struct IStaking.Allocation","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_escrowAddress","type":"address"}],"name":"getAllocationState","outputs":[{"internalType":"enum IStaking.AllocationState","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getListOfStakers","outputs":[{"internalType":"address[]","name":"","type":"address[]"},{"components":[{"internalType":"uint256","name":"tokensStaked","type":"uint256"},{"internalType":"uint256","name":"tokensAllocated","type":"uint256"},{"internalType":"uint256","name":"tokensLocked","type":"uint256"},{"internalType":"uint256","name":"tokensLockedUntil","type":"uint256"}],"internalType":"struct Stakes.Staker[]","name":"","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_staker","type":"address"}],"name":"getStakedTokens","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_staker","type":"address"}],"name":"getStaker","outputs":[{"components":[{"internalType":"uint256","name":"tokensStaked","type":"uint256"},{"internalType":"uint256","name":"tokensAllocated","type":"uint256"},{"internalType":"uint256","name":"tokensLocked","type":"uint256"},{"internalType":"uint256","name":"tokensLockedUntil","type":"uint256"}],"internalType":"struct Stakes.Staker","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_staker","type":"address"}],"name":"hasAvailableStake","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_staker","type":"address"}],"name":"hasStake","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"uint256","name":"_minimumStake","type":"uint256"},{"internalType":"uint32","name":"_lockPeriod","type":"uint32"}],"name":"initialize","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"_escrowAddress","type":"address"}],"name":"isAllocation","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lockPeriod","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"minimumStake","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"proxiableUUID","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"rewardPool","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint32","name":"_lockPeriod","type":"uint32"}],"name":"setLockPeriod","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_minimumStake","type":"uint256"}],"name":"setMinimumStake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_rewardPool","type":"address"}],"name":"setRewardPool","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_slasher","type":"address"},{"internalType":"address","name":"_staker","type":"address"},{"internalType":"address","name":"_escrowAddress","type":"address"},{"internalType":"uint256","name":"_tokens","type":"uint256"}],"name":"slash","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokens","type":"uint256"}],"name":"stake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"stakers","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"stakes","outputs":[{"internalType":"uint256","name":"tokensStaked","type":"uint256"},{"internalType":"uint256","name":"tokensAllocated","type":"uint256"},{"internalType":"uint256","name":"tokensLocked","type":"uint256"},{"internalType":"uint256","name":"tokensLockedUntil","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokens","type":"uint256"}],"name":"unstake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newImplementation","type":"address"}],"name":"upgradeTo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newImplementation","type":"address"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"upgradeToAndCall","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

Contract Creation Code

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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.