Contract Address Details

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import "@openzeppelin/contracts/utils/introspection/IERC165.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "../../governance/implementation/Governed.sol";


contract FakeERC20 is ERC20, Governed, IERC165 {
    uint8 private immutable decimals_;

    constructor(
        IGovernanceSettings _governanceSettings,
        address _initialGovernance,
        string memory _name,
        string memory _symbol,
        uint8 _decimals
    )
        ERC20(_name, _symbol)
        Governed(_governanceSettings, _initialGovernance)
    {
        decimals_ = _decimals;
    }

    function mintAmount(address _target, uint256 amount) public onlyGovernance {
        _mint(_target, amount);
    }

    function burnAmount(uint256 _amount) public {
        _burn(msg.sender, _amount);
    }

    function decimals() public view override returns (uint8) {
        return decimals_;
    }

    /**
     * Implementation of ERC-165 interface.
     */
    function supportsInterface(bytes4 _interfaceId)
        external pure override
        returns (bool)
    {
        return _interfaceId == type(IERC165).interfaceId
            || _interfaceId == type(IERC20).interfaceId
            || _interfaceId == type(IERC20Metadata).interfaceId;
    }
}
        

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * 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}.
     *
     * 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 default value returned by this function, unless
     * it's 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 v4.9.0) (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);
}
          

// 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 v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
          

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import { GovernedBase } from "./GovernedBase.sol";
import { IGovernanceSettings } from "flare-smart-contracts/contracts/userInterfaces/IGovernanceSettings.sol";


/**
 * @title Governed
 * @dev For deployed, governed contracts, enforce non-zero addresses at create time.
 **/
abstract contract Governed is GovernedBase {
    constructor(IGovernanceSettings _governanceSettings, address _initialGovernance) {
        initialise(_governanceSettings, _initialGovernance);
    }
}
          

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import "flare-smart-contracts/contracts/userInterfaces/IGovernanceSettings.sol";
import "../interfaces/IGoverned.sol";

/**
 * @title Governed Base
 * @notice This abstract base class defines behaviors for a governed contract.
 * @dev This class is abstract so that specific behaviors can be defined for the constructor.
 *   Contracts should not be left ungoverned, but not all contract will have a constructor
 *   (for example those pre-defined in genesis).
 * @dev This version is compatible with both Flare (where governance settings is in genesis at the address
 *   0x1000000000000000000000000000000000000007) and Songbird (where governance settings is a deployed contract).
 * @dev It also uses diamond storage for state, so it is safer tp use in diamond structures or proxies.
 **/
abstract contract GovernedBase is IGoverned {
    struct GovernedState {
        IGovernanceSettings governanceSettings;
        bool initialised;
        bool productionMode;
        bool executing;
        address initialGovernance;
        mapping(bytes32 encodedCallHash => uint256 allowedAfterTimestamp) timelockedCalls;
    }

    modifier onlyGovernance {
        if (_timeToExecute()) {
            _beforeExecute();
            _;
        } else {
            _recordTimelockedCall(msg.data, 0);
        }
    }

    modifier onlyGovernanceWithTimelockAtLeast(uint256 _minimumTimelock) {
        if (_timeToExecute()) {
            _beforeExecute();
            _;
        } else {
            _recordTimelockedCall(msg.data, _minimumTimelock);
        }
    }

    modifier onlyImmediateGovernance {
        _checkOnlyGovernance();
        _;
    }

    constructor() {
    }

    /**
     * @notice Execute the timelocked governance calls once the timelock period expires.
     * @dev Only executor can call this method.
     * @param _encodedCall ABI encoded call data (signature and parameters).
     */
    function executeGovernanceCall(bytes calldata _encodedCall) external override {
        GovernedState storage state = _governedState();
        require(isExecutor(msg.sender), "only executor");
        bytes32 encodedCallHash = keccak256(_encodedCall);
        uint256 allowedAfterTimestamp = state.timelockedCalls[encodedCallHash];
        require(allowedAfterTimestamp != 0, "timelock: invalid selector");
        require(block.timestamp >= allowedAfterTimestamp, "timelock: not allowed yet");
        delete state.timelockedCalls[encodedCallHash];
        state.executing = true;
        //solhint-disable-next-line avoid-low-level-calls
        (bool success,) = address(this).call(_encodedCall);
        state.executing = false;
        emit TimelockedGovernanceCallExecuted(encodedCallHash);
        _passReturnOrRevert(success);
    }

    /**
     * Cancel a timelocked governance call before it has been executed.
     * @dev Only governance can call this method.
     * @param _encodedCall ABI encoded call data (signature and parameters).
     */
    function cancelGovernanceCall(bytes calldata _encodedCall) external override onlyImmediateGovernance {
        GovernedState storage state = _governedState();
        bytes32 encodedCallHash = keccak256(_encodedCall);
        require(state.timelockedCalls[encodedCallHash] != 0, "timelock: invalid selector");
        emit TimelockedGovernanceCallCanceled(encodedCallHash);
        delete state.timelockedCalls[encodedCallHash];
    }

    /**
     * Enter the production mode after all the initial governance settings have been set.
     * This enables timelocks and the governance is afterwards obtained by calling
     * governanceSettings.getGovernanceAddress().
     */
    function switchToProductionMode() external onlyImmediateGovernance {
        GovernedState storage state = _governedState();
        require(!state.productionMode, "already in production mode");
        state.initialGovernance = address(0);
        state.productionMode = true;
        emit GovernedProductionModeEntered(address(state.governanceSettings));
    }

    /**
     * @notice Initialize the governance address if not first initialized.
     */
    function initialise(IGovernanceSettings _governanceSettings, address _initialGovernance) public virtual {
        GovernedState storage state = _governedState();
        require(state.initialised == false, "initialised != false");
        require(address(_governanceSettings) != address(0), "governance settings zero");
        require(_initialGovernance != address(0), "_governance zero");
        state.initialised = true;
        state.governanceSettings = _governanceSettings;
        state.initialGovernance = _initialGovernance;
        emit GovernanceInitialised(_initialGovernance);
    }

    /**
     * Returns the governance settings contract address.
     */
    function governanceSettings() public view returns (IGovernanceSettings) {
        return _governedState().governanceSettings;
    }

    /**
     * True after switching to production mode (see `switchToProductionMode()`).
     */
    function productionMode() public view returns (bool) {
        return _governedState().productionMode;
    }

    /**
     * Returns the current effective governance address.
     */
    function governance() public view returns (address) {
        GovernedState storage state = _governedState();
        return state.productionMode ? state.governanceSettings.getGovernanceAddress() : state.initialGovernance;
    }

    /**
     * Check if an address is one of the executors defined in governanceSettings.
     */
    function isExecutor(address _address) public view returns (bool) {
        GovernedState storage state = _governedState();
        return state.initialised && state.governanceSettings.isExecutor(_address);
    }

    function _beforeExecute() private {
        GovernedState storage state = _governedState();
        if (state.executing) {
            // can only be run from executeGovernanceCall(), where we check that only executor can call
            // make sure nothing else gets executed, even in case of reentrancy
            assert(msg.sender == address(this));
            state.executing = false;
        } else {
            // must be called with: productionMode=false
            // must check governance in this case
            _checkOnlyGovernance();
        }
    }

    function _recordTimelockedCall(bytes calldata _encodedCall, uint256 _minimumTimelock) private {
        GovernedState storage state = _governedState();
        _checkOnlyGovernance();
        bytes32 encodedCallHash = keccak256(_encodedCall);
        uint256 timelock = state.governanceSettings.getTimelock();
        if (timelock < _minimumTimelock) {
            timelock = _minimumTimelock;
        }
        uint256 allowedAt = block.timestamp + timelock;
        state.timelockedCalls[encodedCallHash] = allowedAt;
        emit GovernanceCallTimelocked(_encodedCall, encodedCallHash, allowedAt);
    }

    function _timeToExecute() private view returns (bool) {
        GovernedState storage state = _governedState();
        return state.executing || !state.productionMode;
    }

    function _checkOnlyGovernance() private view {
        require(msg.sender == governance(), "only governance");
    }

    function _governedState() private pure returns (GovernedState storage _state) {
        bytes32 position = keccak256("fasset.GovernedBase.GovernedState");
        // solhint-disable-next-line no-inline-assembly
        assembly {
            _state.slot := position
        }
    }

    function _passReturnOrRevert(bool _success) private pure {
        // pass exact return or revert data - needs to be done in assembly
        //solhint-disable-next-line no-inline-assembly
        assembly {
            let size := returndatasize()
            let ptr := mload(0x40)
            mstore(0x40, add(ptr, size))
            returndatacopy(ptr, 0, size)
            if _success {
                return(ptr, size)
            }
            revert(ptr, size)
        }
    }
}
          

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6 <0.9;

import "flare-smart-contracts/contracts/userInterfaces/IGovernanceSettings.sol";


interface IGoverned {
    /**
     * Governance call was timelocked. It can be executed after `allowedAfterTimestamp` by one of the executors.
     * @param encodedCall ABI encoded call data, to be used in executeGovernanceCall
     * @param encodedCallHash keccak256 hash of the ABI encoded call data
     * @param allowedAfterTimestamp the earliest timestamp when the call can be executed
     */
    event GovernanceCallTimelocked(bytes encodedCall, bytes32 encodedCallHash, uint256 allowedAfterTimestamp);

    /**
     * Previously timelocked governance call was executed.
     * @param encodedCallHash keccak256 hash of the ABI encoded call data
     *      (same as `GovernanceCallTimelocked.encodedCallHash`)
     */
    event TimelockedGovernanceCallExecuted(bytes32 encodedCallHash);

    /**
     * Previously timelocked governance call was canceled.
     * @param encodedCallHash keccak256 hash of the ABI encoded call data
     *      (same as `GovernanceCallTimelocked.encodedCallHash`)
     */
    event TimelockedGovernanceCallCanceled(bytes32 encodedCallHash);

    /**
     * Governed contract was initialised (not yet in production mode).
     * @param initialGovernance the governance address used until switch to production mode
     */
    event GovernanceInitialised(address initialGovernance);

    /**
     * The governed contract has switched to production mode
     * Timelocks are now enabled and the governance address is `governanceSettings.getGovernanceAddress()`.
     * @param governanceSettings the system contract holding governance address, timelock and executors settings
     */
    event GovernedProductionModeEntered(address governanceSettings);

    /**
     * @notice Execute the timelocked governance calls once the timelock period expires.
     * @dev Only executor can call this method.
     * @param _encodedCall ABI encoded call data (signature and parameters).
     *      You should use `encodedCall` parameter from `GovernanceCallTimelocked` event.
     */
    function executeGovernanceCall(bytes calldata _encodedCall) external;

    /**
     * Cancel a timelocked governance call before it has been executed.
     * @dev Only governance can call this method.
     * @param _encodedCall ABI encoded call data (signature and parameters).
     *      You should use `encodedCall` parameter from `GovernanceCallTimelocked` event.
     */
    function cancelGovernanceCall(bytes calldata _encodedCall) external;

    /**
     * Enter the production mode after all the initial governance settings have been set.
     * This enables timelocks and the governance is afterwards obtained by calling
     * `governanceSettings.getGovernanceAddress()`.
     */
    function switchToProductionMode() external;

    /**
     * Returns the governance settings contract address.
     */
    function governanceSettings() external view returns (IGovernanceSettings);

    /**
     * True after switching to production mode (see `switchToProductionMode()`).
     */
    function productionMode() external view returns (bool);

    /**
     * Returns the current effective governance address.
     * Before switching to production, the effective governance is `initialGovernance`,
     * and afterwards it is `governanceSettings.getGovernanceAddress()`.
     */
    function governance() external view returns (address);

    /**
     * Check if an address is one of the executors defined in `governanceSettings`.
     */
    function isExecutor(address _address) external view returns (bool);
}
          

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6 <0.9;


/**
 * A special contract that holds Flare governance address.
 * This contract enables updating governance address and timelock only by hard forking the network,
 * meaning only by updating validator code.
 */
interface IGovernanceSettings {
    /**
     * Get the governance account address.
     * The governance address can only be changed by a hardfork.
     */
    function getGovernanceAddress() external view returns (address);
    
    /**
     * Get the time in seconds that must pass between a governance call and execution.
     * The timelock value can only be changed by a hardfork.
     */
    function getTimelock() external view returns (uint256);
    
    /**
     * Get the addresses of the accounts that are allowed to execute the timelocked governance calls
     * once the timelock period expires.
     * Executors can be changed without a hardfork, via a normal governance call.
     */
    function getExecutors() external view returns (address[] memory);
    
    /**
     * Check whether an address is one of the executors.
     */
    function isExecutor(address _address) external view returns (bool);
}