Cryo Explorer Ethereum Mainnet

// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.18;

import {CommonErrors} from "./Errors.sol";

/// @title Auth
contract Auth {
    /// @dev Emitted when the Golem Foundation multisig address is set.
    /// @param oldValue The old Golem Foundation multisig address.
    /// @param newValue The new Golem Foundation multisig address.
    event MultisigSet(address oldValue, address newValue);

    /// @dev Emitted when ownership transfer is initiated.
    /// @param previousOwner Old multisig, one that initiated the process.
    /// @param newOwner New multisig, one that should finalize the process.
    event OwnershipTransferStarted(
        address indexed previousOwner,
        address indexed newOwner
    );

    /// @dev The multisig address.
    address public multisig;

    /// @dev Pending multisig address.
    address public pendingOwner;

    /// @param _multisig The initial Golem Foundation multisig address.
    constructor(address _multisig) {
        require(_multisig != address(0), CommonErrors.INVALID_ARGUMENT);
        multisig = _multisig;
        emit MultisigSet(address(0), multisig);
    }

    /**
     * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) external {
        require(newOwner != address(0));
        require(msg.sender == multisig, CommonErrors.UNAUTHORIZED_CALLER);
        pendingOwner = newOwner;
        emit OwnershipTransferStarted(multisig, newOwner);
    }

    /**
     * @dev The new owner accepts the ownership transfer.
     */
    function acceptOwnership() external {
        require(msg.sender == pendingOwner, CommonErrors.UNAUTHORIZED_CALLER);
        emit MultisigSet(multisig, pendingOwner);
        multisig = pendingOwner;
        pendingOwner = address(0);
    }
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.18;

library DepositsErrors {
    /// @notice Thrown when transfer operation fails in GLM smart contract.
    /// @return HN:Deposits/cannot-transfer-from-sender
    string public constant GLM_TRANSFER_FAILED =
        "HN:Deposits/cannot-transfer-from-sender";

    /// @notice Thrown when trying to withdraw more GLMs than are in deposit.
    /// @return HN:Deposits/deposit-is-smaller
    string public constant DEPOSIT_IS_TO_SMALL =
        "HN:Deposits/deposit-is-smaller";
}

library EpochsErrors {
    /// @notice Thrown when calling the contract before the first epoch started.
    /// @return HN:Epochs/not-started-yet
    string public constant NOT_STARTED = "HN:Epochs/not-started-yet";

    /// @notice Thrown when getFinalizedEpoch function is called before any epoch has been finalized.
    /// @return HN:Epochs/not-finalized
    string public constant NOT_FINALIZED = "HN:Epochs/not-finalized";

    /// @notice Thrown when getPendingEpoch function is called during closed decision window.
    /// @return HN:Epochs/not-pending
    string public constant NOT_PENDING = "HN:Epochs/not-pending";

    /// @notice Thrown when updating epoch props to invalid values (decision window bigger than epoch duration.
    /// @return HN:Epochs/decision-window-bigger-than-duration
    string public constant DECISION_WINDOW_TOO_BIG =
        "HN:Epochs/decision-window-bigger-than-duration";
}

library ProposalsErrors {
    /// @notice Thrown when trying to change proposals that could already have been voted upon.
    /// @return HN:Proposals/only-future-proposals-changing-is-allowed
    string public constant CHANGING_PROPOSALS_IN_THE_PAST =
        "HN:Proposals/only-future-proposals-changing-is-allowed";

    /// @notice Thrown when setting epochs multiple times.
    /// @return HN:Proposals/cannot-set-epochs-twice
    string public constant CANNOT_SET_EPOCHS_TWICE =
        "HN:Proposals/cannot-set-epochs-twice";

    /// @notice Thrown when setting proposal with zero address.
    /// @return HN:Proposals/invalid-proposal
    string public constant INVALID_PROPOSAL = "HN:Proposals/invalid-proposal";
}

library VaultErrors {
    /// @notice Thrown when trying to set merkle root for an epoch multiple times.
    /// @return HN:Vault/merkle-root-already-set
    string public constant MERKLE_ROOT_ALREADY_SET =
        "HN:Vault/merkle-root-already-set";

    /// @notice Thrown when trying to set invalid merkle root.
    /// @return HN:Vault/invalid-merkle-root
    string public constant INVALID_MERKLE_ROOT = "HN:Vault/invalid-merkle-root";

    /// @notice Thrown when trying to withdraw without providing valid merkle proof.
    /// @return HN:Vault/invalid-merkle-proof
    string public constant INVALID_MERKLE_PROOF =
        "HN:Vault/invalid-merkle-proof";

    /// @notice Thrown when trying to withdraw multiple times.
    /// @return HN:Vault/already-claimed
    string public constant ALREADY_CLAIMED = "HN:Vault/already-claimed";

    /// @notice Thrown when trying to send empty payload list.
    /// @return HN:Vault/empty-payloads
    string public constant EMPTY_PAYLOADS = "HN:Vault/empty-payloads";
}

library CommonErrors {
    /// @notice Thrown when trying to call as an unauthorized account.
    /// @return HN:Common/unauthorized-caller
    string public constant UNAUTHORIZED_CALLER =
        "HN:Common/unauthorized-caller";

    /// @notice Thrown when failed to send eth.
    /// @return HN:Common/failed-to-send
    string public constant FAILED_TO_SEND = "HN:Common/failed-to-send";

    /// @notice Thrown when invalid argument provided.
    /// @return HN:Common/invalid-argument
    string public constant INVALID_ARGUMENT = "HN:Common/invalid-argument";
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.18;

import "./interfaces/IDeposits.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

import {DepositsErrors, CommonErrors} from "./Errors.sol";
import "./OctantBase.sol";

/// @title Contract tracking GLM deposits for Octant project.
/// @author Golem Foundation
/// @notice GLM can be locked or unlocked at any moment by its owner.
/// To be more capital effective, do lock at the end of an epoch,
/// and unlock at the beginning of an epoch.
/// @dev Please note that complexity of this contract should be kept as low as possible,
/// even at the cost of increased complexity of other contracts. Lets strive to limit
/// risk exposure of GLM deposits.
contract Deposits is OctantBase, IDeposits {
    /// @notice GLM token contract address
    ERC20 public immutable glm;

    event Locked(
        uint256 depositBefore,
        uint256 amount,
        uint256 when,
        address user
    );
    event Unlocked(
        uint256 depositBefore,
        uint256 amount,
        uint256 when,
        address user
    );

    /// @dev deposit amounts per user
    mapping(address => uint256) public deposits;

    /// @param glmAddress Address of Golem Network Token contract (updated, GLM).
    constructor(address glmAddress, address _auth) OctantBase(_auth) {
        require(glmAddress != address(0), CommonErrors.INVALID_ARGUMENT);
        glm = ERC20(glmAddress);
    }

    /// @notice Lock GLM to enable participation in Octant experiment.
    /// This can be done at any time, but it is most capital effective at the end of the epoch.
    /// @param amount Amount of GLM to be locked.
    function lock(uint256 amount) external {
        require(amount != 0, CommonErrors.INVALID_ARGUMENT);

        uint256 oldDeposit = deposits[msg.sender];
        deposits[msg.sender] = oldDeposit + amount;
        require(
            glm.transferFrom(msg.sender, address(this), amount),
            DepositsErrors.GLM_TRANSFER_FAILED
        );
        emit Locked(oldDeposit, amount, block.timestamp, msg.sender);
    }

    /// @notice Unlock GLM. This can be done at any time, but it is most capital effective at the beginning of the epoch.
    /// @param amount Amount of GLM to be unlocked.
    function unlock(uint256 amount) external {
        uint256 oldDeposit = deposits[msg.sender];
        require(oldDeposit >= amount, DepositsErrors.DEPOSIT_IS_TO_SMALL);
        deposits[msg.sender] = oldDeposit - amount;
        require(glm.transfer(msg.sender, amount));
        emit Unlocked(oldDeposit, amount, block.timestamp, msg.sender);
    }
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.18;

import {CommonErrors} from "./Errors.sol";
import "./Auth.sol";

/// @title OctantBase
/// @dev This is the base contract for all Octant contracts that have functions with access restricted
/// to deployer or the Golem Foundation multisig.
/// It provides functionality for setting and accessing the Golem Foundation multisig address.
abstract contract OctantBase {
    /// @dev The Auth contract instance
    Auth public immutable auth;

    /// @param _auth the contract containing Octant authorities.
    constructor(address _auth) {
        require(_auth != address(0), CommonErrors.INVALID_ARGUMENT);
        auth = Auth(_auth);
    }

    /// @dev Gets the Golem Foundation multisig address.
    function getMultisig() internal view returns (address) {
        return auth.multisig();
    }

    /// @dev Modifier that allows only the Golem Foundation multisig address to call a function.
    modifier onlyMultisig() {
        require(
            msg.sender == auth.multisig(),
            CommonErrors.UNAUTHORIZED_CALLER
        );
        _;
    }
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.18;

interface IDeposits {
    /// @notice function deposits() returns user's GLMs locked amount by address
    function deposits(address) external view returns (uint256);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

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

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

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

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

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

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

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

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

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

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

        return true;
    }

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

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

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

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

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

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

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

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

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

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

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}