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// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "IERC20.sol";
import "IStateChainGateway.sol";
import "IKeyManager.sol";
import "IFlipIssuer.sol";
import "IFLIP.sol";
import "AggKeyNonceConsumer.sol";
import "GovernanceCommunityGuarded.sol";

/**
 * @title    State Chain Gateway contract
 * @notice   Manages the funding and redemption FLIP from/to stateChain accounts.
 *           Accounts on the FLIP state chain basically have full control
 *           of FLIP leaving the contract. FLIP can be added to the StateChain
 *           account via `fundStateChainAccount` with their stateChain nodeID.
 *
 *           This contract also handles the minting and burning of FLIP after the
 *           initial supply is minted during FLIP's creation. At any time, a
 *           valid aggragate signature can be submitted to the contract which
 *           updates the total supply by minting or burning the necessary FLIP.
 */
contract StateChainGateway is IFlipIssuer, IStateChainGateway, AggKeyNonceConsumer, GovernanceCommunityGuarded {
    /// @dev    The FLIP token address. To be set only once after deployment via setFlip.
    // solhint-disable-next-line var-name-mixedcase
    IFLIP private _FLIP;

    /// @dev    The minimum amount of FLIP needed to fund an account, to prevent spamming
    uint256 private _minFunding;
    /// @dev    Holding pending redemptions for the 48h withdrawal delay
    mapping(bytes32 => Redemption) private _pendingRedemptions;
    /// @dev   Time after registerRedemption required to wait before call to executeRedemption
    // solhint-disable-next-line var-name-mixedcase
    uint48 public immutable REDEMPTION_DELAY;

    /// @dev    The last block number in which the State Chain updated the totalSupply
    uint256 private _lastSupplyUpdateBlockNum = 0;

    // Defined in IStateChainGateway, just here for convenience
    // struct Redemption {
    //     uint amount;
    //     address redeemAddress;
    //     // 48 so that 160 (from redeemAddress) + 48 + 48 is 256 they can all be packed
    //     // into a single 256 bit slot
    //     uint48 startTime;
    //     uint48 expiryTime;
    //     address executor;
    // }

    constructor(
        IKeyManager keyManager,
        uint256 minFunding,
        uint48 redemptionDelay
    ) AggKeyNonceConsumer(keyManager) nzUint(redemptionDelay) {
        _minFunding = minFunding;
        REDEMPTION_DELAY = redemptionDelay;
    }

    /// @dev   Get the governor address from the KeyManager. This is called by the onlyGovernor
    ///        modifier in the GovernanceCommunityGuarded. This logic can't be moved to the
    ///        GovernanceCommunityGuarded since it requires a reference to the KeyManager.
    function _getGovernor() internal view override returns (address) {
        return getKeyManager().getGovernanceKey();
    }

    /// @dev   Get the community key from the KeyManager. This is called by the isCommunityKey
    ///        modifier in the GovernanceCommunityGuarded. This logic can't be moved to the
    ///        GovernanceCommunityGuarded since it requires a reference to the KeyManager.
    function _getCommunityKey() internal view override returns (address) {
        return getKeyManager().getCommunityKey();
    }

    /**
     * @notice  Get the FLIP token address
     * @dev     This function and it's return value will be checked when updating the FLIP issuer.
     *          Do not remove nor modify this function in future versions of this contract.
     * @return  The address of FLIP
     */
    function getFLIP() external view override returns (IFLIP) {
        return _FLIP;
    }

    /// @dev   Ensure that a new keyManager has the getGovernanceKey() and getCommunityKey()
    ///        functions implemented. These are functions required for this contract to
    ///        to at least be able to use the emergency mechanism.
    function _checkUpdateKeyManager(IKeyManager keyManager, bool omitChecks) internal view override {
        address newGovKey = keyManager.getGovernanceKey();
        address newCommKey = keyManager.getCommunityKey();

        if (!omitChecks) {
            // Ensure that the keys are the same
            require(newGovKey == _getGovernor() && newCommKey == _getCommunityKey());

            Key memory newAggKey = keyManager.getAggregateKey();
            Key memory currentAggKey = getKeyManager().getAggregateKey();

            require(
                newAggKey.pubKeyX == currentAggKey.pubKeyX && newAggKey.pubKeyYParity == currentAggKey.pubKeyYParity
            );
        } else {
            // Check that the addresses have been initialized
            require(newGovKey != address(0) && newCommKey != address(0));
        }
    }

    //////////////////////////////////////////////////////////////
    //                                                          //
    //                  State-changing functions                //
    //                                                          //
    //////////////////////////////////////////////////////////////

    /**
     * @notice  Sets the FLIP address after initialization. We can't do this in the constructor
     *          because FLIP contract requires this contract's address on deployment for minting.
     *          First this contract is deployed, then the FLIP contract and finally setFLIP
     *          should be called. Deployed via DeployerContract.sol so it can't be frontrun.
     *          The FLIP address can only be set once.
     * @param flip FLIP token address
     */
    function setFlip(IFLIP flip) external override nzAddr(address(flip)) {
        require(address(_FLIP) == address(0), "Gateway: Flip address already set");
        _FLIP = flip;
        emit FLIPSet(address(flip));
    }

    /**
     * @notice          Add FLIP funds to a StateChain account identified with a nodeID
     * @dev             Requires the funder to have called `approve` in FLIP
     * @param amount    The amount of FLIP tokens
     * @param nodeID    The nodeID of the account to fund
     */
    function fundStateChainAccount(bytes32 nodeID, uint256 amount) external override nzBytes32(nodeID) {
        IFLIP flip = _FLIP;
        require(address(flip) != address(0), "Gateway: Flip not set");
        require(amount >= _minFunding, "Gateway: not enough funds");
        // Assumption of set token allowance by the user
        flip.transferFrom(msg.sender, address(this), amount);
        emit Funded(nodeID, amount, msg.sender);
    }

    /**
     * @notice  Redeem FLIP from the StateChain. The State Chain will determine the amount
     *          that can be redeemed, but a basic calculation for a validator would be:
     *          amount redeemable = stake + rewards - penalties.
     * @param sigData   Struct containing the signature data over the message
     *                  to verify, signed by the aggregate key.
     * @param nodeID    The nodeID of the account redeeming the FLIP
     * @param amount    The amount of funds to be locked up
     * @param redeemAddress    The redeemAddress who will receive the FLIP
     * @param expiryTime  The last valid timestamp that can execute this redemption (uint48)
     * @param executor    The address that can execute the redemption (zero address if anyone)
     */
    function registerRedemption(
        SigData calldata sigData,
        bytes32 nodeID,
        uint256 amount,
        address redeemAddress,
        uint48 expiryTime,
        address executor
    )
        external
        override
        onlyNotSuspended
        nzBytes32(nodeID)
        nzUint(amount)
        nzAddr(redeemAddress)
        consumesKeyNonce(
            sigData,
            keccak256(abi.encode(this.registerRedemption.selector, nodeID, amount, redeemAddress, expiryTime, executor))
        )
    {
        require(
            // Must be fresh or have been executed & deleted, or past the expiry
            block.timestamp > uint256(_pendingRedemptions[nodeID].expiryTime),
            "Gateway: a pending redemption exists"
        );

        uint48 startTime = uint48(block.timestamp) + REDEMPTION_DELAY;
        require(expiryTime > startTime, "Gateway: expiry time too soon");

        _pendingRedemptions[nodeID] = Redemption(amount, redeemAddress, startTime, expiryTime, executor);
        emit RedemptionRegistered(nodeID, amount, redeemAddress, startTime, expiryTime, executor);
    }

    /**
     * @notice  Execute a pending redemption to get back funds. Cannot execute a pending
     *          redemption before 48h have passed after registering it, or after the specified
     *          expiry time
     * @dev     No need for nzUint(nodeID) since that is handled by `redemption.expiryTime > 0`
     * @param nodeID    The nodeID of the funder
     */
    function executeRedemption(bytes32 nodeID) external override onlyNotSuspended returns (address, uint256) {
        Redemption memory redemption = _pendingRedemptions[nodeID];
        require(
            block.timestamp >= redemption.startTime && redemption.expiryTime > 0,
            "Gateway: early or already execd"
        );

        // Housekeeping
        delete _pendingRedemptions[nodeID];

        if (block.timestamp <= redemption.expiryTime) {
            if (redemption.executor != address(0)) {
                require(msg.sender == redemption.executor, "Gateway: not executor");
            }
            emit RedemptionExecuted(nodeID, redemption.amount);

            // Send the tokens
            _FLIP.transfer(redemption.redeemAddress, redemption.amount);
            return (redemption.redeemAddress, redemption.amount);
        } else {
            emit RedemptionExpired(nodeID, redemption.amount);
            return (redemption.redeemAddress, 0);
        }
    }

    /**
     * @notice  Compares a given new FLIP supply against the old supply and mints or burns
     *          FLIP tokens from this contract as appropriate.
     *          It requires a message signed by the aggregate key.
     * @dev     Hardcoded to only mint and burn FLIP tokens to/from this contract.
     * @param sigData               Struct containing the signature data over the message
     *                              to verify, signed by the aggregate key.
     * @param newTotalSupply        new total supply of FLIP
     * @param stateChainBlockNumber State Chain block number for the new total supply
     */
    function updateFlipSupply(
        SigData calldata sigData,
        uint256 newTotalSupply,
        uint256 stateChainBlockNumber
    )
        external
        override
        onlyNotSuspended
        nzUint(newTotalSupply)
        consumesKeyNonce(
            sigData,
            keccak256(abi.encode(this.updateFlipSupply.selector, newTotalSupply, stateChainBlockNumber))
        )
    {
        require(stateChainBlockNumber > _lastSupplyUpdateBlockNum, "Gateway: old FLIP supply update");
        _lastSupplyUpdateBlockNum = stateChainBlockNumber;
        IFLIP flip = _FLIP;
        uint256 oldSupply = flip.totalSupply();
        if (newTotalSupply < oldSupply) {
            uint256 amount = oldSupply - newTotalSupply;
            flip.burn(address(this), amount);
        } else if (newTotalSupply > oldSupply) {
            uint256 amount = newTotalSupply - oldSupply;
            flip.mint(address(this), amount);
        }
        emit FlipSupplyUpdated(oldSupply, newTotalSupply, stateChainBlockNumber);
    }

    /**
     * @notice  Updates the address that is allowed to issue FLIP tokens. This will be used when this
     *          contract needs an upgrade. A new contract will be deployed and all the FLIP will be
     *          transferred to it via the redemption process. Finally the right to issue FLIP will be transferred.
     * @dev     The new issuer must be a contract and, in a standard upgrade, it must have the reference FLIP address.
     *          In a special case where the check is omitted, the new issuer must be a contract, never an EOA.
     * @param sigData     Struct containing the signature data over the message
     *                    to verify, signed by the aggregate key.
     * @param newIssuer   New contract that will issue FLIP tokens.
     * @param omitChecks Allow the omission of the extra checks in a special case
     */
    function updateFlipIssuer(
        SigData calldata sigData,
        address newIssuer,
        bool omitChecks
    )
        external
        override
        onlyNotSuspended
        nzAddr(newIssuer)
        consumesKeyNonce(sigData, keccak256(abi.encode(this.updateFlipIssuer.selector, newIssuer, omitChecks)))
    {
        if (!omitChecks) {
            require(IFlipIssuer(newIssuer).getFLIP() == _FLIP, "Gateway: wrong FLIP ref");
        } else {
            require(newIssuer.code.length > 0);
        }

        _FLIP.updateIssuer(newIssuer);
    }

    /**
     * @notice      Set the minimum amount of funds needed for `fundStateChainAccount` to be able
     *              to be called. Used to prevent spamming of funding.
     * @param newMinFunding   The new minimum funding amount
     */
    function setMinFunding(uint256 newMinFunding) external override nzUint(newMinFunding) onlyGovernor {
        emit MinFundingChanged(_minFunding, newMinFunding);
        _minFunding = newMinFunding;
    }

    /**
     * @notice Withdraw all FLIP to governance address in case of emergency. This withdrawal needs
     *         to be approved by the Community, it is a last resort. Used to rectify an emergency.
     *         Transfer the issuance to the governance address if this contract is the issuer.
     */
    function govWithdraw() external override onlyGovernor onlyCommunityGuardDisabled onlySuspended {
        IFLIP flip = _FLIP;
        uint256 amount = flip.balanceOf(address(this));

        // Could use msg.sender or getGovernor() but hardcoding the get call just for extra safety
        address governor = getKeyManager().getGovernanceKey();
        flip.transfer(governor, amount);
        emit GovernanceWithdrawal(governor, amount);

        // Check issuer to ensure this doesn't revert
        if (flip.getIssuer() == address(this)) {
            flip.updateIssuer(governor);
        }
    }

    /**
     * @notice Update the FLIP Issuer address with the governance address in case of emergency.
     *         This needs to be approved by the Community, it is a last resort. Used to rectify
     *         an emergency.
     */
    function govUpdateFlipIssuer() external override onlyGovernor onlyCommunityGuardDisabled onlySuspended {
        address governor = getKeyManager().getGovernanceKey();
        _FLIP.updateIssuer(governor);
    }

    //////////////////////////////////////////////////////////////
    //                                                          //
    //                  Non-state-changing functions            //
    //                                                          //
    //////////////////////////////////////////////////////////////

    /**
     * @notice  Get the minimum amount of funds that's required for funding
     *          an account on the StateChain.
     * @return  The minimum amount (uint)
     */
    function getMinimumFunding() external view override returns (uint256) {
        return _minFunding;
    }

    /**
     * @notice  Get the pending redemption for the input nodeID. If there was never
     *          a pending redemption for this nodeID, or it has already been executed
     *          (and therefore deleted), it'll return (0, 0x00..., 0, 0)
     * @param nodeID   The nodeID which has a pending redemption
     * @return         The redemption (Redemption struct)
     */
    function getPendingRedemption(bytes32 nodeID) external view override returns (Redemption memory) {
        return _pendingRedemptions[nodeID];
    }

    /**
     * @notice  Get the last state chain block number of the last supply update
     * @return  The state chain block number of the last supply update
     */
    function getLastSupplyUpdateBlockNumber() external view override returns (uint256) {
        return _lastSupplyUpdateBlockNum;
    }
}

// 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

pragma solidity ^0.8.0;

import "IFLIP.sol";
import "IAggKeyNonceConsumer.sol";
import "IGovernanceCommunityGuarded.sol";
import "IFlipIssuer.sol";

/**
 * @title    StateChainGateway interface
 */
interface IStateChainGateway is IGovernanceCommunityGuarded, IFlipIssuer, IAggKeyNonceConsumer {
    event Funded(bytes32 indexed nodeID, uint256 amount, address funder);
    event RedemptionRegistered(
        bytes32 indexed nodeID,
        uint256 amount,
        address indexed redeemAddress,
        uint48 startTime,
        uint48 expiryTime,
        address executor
    );
    event RedemptionExecuted(bytes32 indexed nodeID, uint256 amount);
    event RedemptionExpired(bytes32 indexed nodeID, uint256 amount);
    event MinFundingChanged(uint256 oldMinFunding, uint256 newMinFunding);
    event GovernanceWithdrawal(address to, uint256 amount);
    event FLIPSet(address flip);
    event FlipSupplyUpdated(uint256 oldSupply, uint256 newSupply, uint256 stateChainBlockNumber);

    struct Redemption {
        uint256 amount;
        address redeemAddress;
        // 48 so that 160 (from redeemAddress) + 48 + 48 is 256 they can all be packed
        // into a single 256 bit slot
        uint48 startTime;
        uint48 expiryTime;
        address executor;
    }

    /**
     * @notice  Sets the FLIP address after initialization. We can't do this in the constructor
     *          because FLIP contract requires this contract's address on deployment for minting.
     *          First this contract is deployed, then the FLIP contract and finally setFLIP
     *          should be called. OnlyDeployer modifer for added security since tokens will be
     *          minted to this contract before calling setFLIP.
     * @param flip FLIP token address
     */
    function setFlip(IFLIP flip) external;

    /**
     * @notice          Add FLIP funds to a StateChain account identified with a nodeID
     * @dev             Requires the funder to have called `approve` in FLIP
     * @param amount    The amount of FLIP tokens
     * @param nodeID    The nodeID of the account to fund
     */
    function fundStateChainAccount(bytes32 nodeID, uint256 amount) external;

    /**
     * @notice  Redeem FLIP from the StateChain. The State Chain will determine the amount
     *          that can be redeemed, but a basic calculation for a validator would be:
     *          amount redeemable = stake + rewards - penalties.
     * @param sigData   Struct containing the signature data over the message
     *                  to verify, signed by the aggregate key.
     * @param nodeID    The nodeID of the account redeeming the FLIP
     * @param amount    The amount of funds to be locked up
     * @param redeemAddress    The redeemAddress who will receive the FLIP
     * @param expiryTime   The last valid timestamp that can execute this redemption (uint48)
     */
    function registerRedemption(
        SigData calldata sigData,
        bytes32 nodeID,
        uint256 amount,
        address redeemAddress,
        uint48 expiryTime,
        address executor
    ) external;

    /**
     * @notice  Execute a pending redemption to get back funds. Cannot execute a pending
     *          redemption before 48h have passed after registering it, or after the specified
     *          expiry time
     * @dev     No need for nzUint(nodeID) since that is handled by `redemption.expiryTime > 0`
     * @param nodeID    The nodeID of the account redeeming the FLIP
     * @return          The address that received the FLIP and the amount
     */
    function executeRedemption(bytes32 nodeID) external returns (address, uint256);

    /**
     * @notice  Compares a given new FLIP supply against the old supply and mints or burns
     *          FLIP tokens from this contract as appropriate.
     *          It requires a message signed by the aggregate key.
     * @param sigData    Struct containing the signature data over the message
     *                   to verify, signed by the aggregate key.
     * @param newTotalSupply        new total supply of FLIP
     * @param stateChainBlockNumber State Chain block number for the new total supply
     */
    function updateFlipSupply(SigData calldata sigData, uint256 newTotalSupply, uint256 stateChainBlockNumber) external;

    /**
     * @notice  Updates the address that is allowed to issue FLIP tokens. This will be used when this
     *          contract needs an upgrade. A new contract will be deployed and all the FLIP will be
     *          transferred to it via the redemption process. Finally the right to issue FLIP will be transferred.
     * @param sigData     Struct containing the signature data over the message
     *                    to verify, signed by the aggregate key.
     * @param newIssuer   New contract that will issue FLIP tokens.
     * @param omitChecks Allow the omission of the extra checks in a special case
     */
    function updateFlipIssuer(SigData calldata sigData, address newIssuer, bool omitChecks) external;

    /**
     * @notice      Set the minimum amount of funds needed for `fundStateChainAccount` to be able
     *              to be called. Used to prevent spamming of funding.
     * @param newMinFunding   The new minimum funding amount
     */
    function setMinFunding(uint256 newMinFunding) external;

    /**
     * @notice Withdraw all FLIP to governance address in case of emergency. This withdrawal needs
     *         to be approved by the Community, it is a last resort. Used to rectify an emergency.
     *         The governance address is also updated as the issuer of FLIP.
     */
    function govWithdraw() external;

    /**
     * @notice Update the FLIP Issuer address with the governance address in case of emergency.
     *         This needs to be approved by the Community, it is a last resort. Used to rectify
     *         an emergency.
     */
    function govUpdateFlipIssuer() external;

    //////////////////////////////////////////////////////////////
    //                                                          //
    //                  Non-state-changing functions            //
    //                                                          //
    //////////////////////////////////////////////////////////////

    /**
     * @notice  Get the minimum amount of funds that's required for funding
     *          an account on the StateChain.
     * @return  The minimum amount (uint)
     */
    function getMinimumFunding() external view returns (uint256);

    /**
     * @notice  Get the pending redemption for the input nodeID. If there was never
     *          a pending redemption for this nodeID, or it has already been executed
     *          (and therefore deleted), it'll return (0, 0x00..., 0, 0)
     * @param nodeID   The nodeID which has a pending redemption
     * @return         The redemption (Redemption struct)
     */
    function getPendingRedemption(bytes32 nodeID) external view returns (Redemption memory);

    /**
     * @notice  Get the last state chain block number that the supply was updated at
     * @return  The state chain block number of the last update
     */
    function getLastSupplyUpdateBlockNumber() external view returns (uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "IERC20.sol";

/**
 * @title    FLIP interface for the FLIP utility token
 */
interface IFLIP is IERC20 {
    event IssuerUpdated(address oldIssuer, address newIssuer);

    //////////////////////////////////////////////////////////////
    //                                                          //
    //                  State-changing functions                //
    //                                                          //
    //////////////////////////////////////////////////////////////

    function mint(address account, uint amount) external;

    function burn(address account, uint amount) external;

    function updateIssuer(address newIssuer) external;

    //////////////////////////////////////////////////////////////
    //                                                          //
    //                  Non-state-changing functions            //
    //                                                          //
    //////////////////////////////////////////////////////////////

    function getIssuer() external view returns (address);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "IShared.sol";
import "IKeyManager.sol";

/**
 * @title    AggKeyNonceConsumer interface
 */

interface IAggKeyNonceConsumer is IShared {
    event UpdatedKeyManager(address keyManager);

    //////////////////////////////////////////////////////////////
    //                                                          //
    //                  State-changing functions                //
    //                                                          //
    //////////////////////////////////////////////////////////////
    /**
     * @notice  Update KeyManager reference. Used if KeyManager contract is updated
     * @param sigData    Struct containing the signature data over the message
     *                   to verify, signed by the aggregate key.
     * @param keyManager New KeyManager's address
     * @param omitChecks Allow the omission of the extra checks in a special case
     */
    function updateKeyManager(SigData calldata sigData, IKeyManager keyManager, bool omitChecks) external;

    //////////////////////////////////////////////////////////////
    //                                                          //
    //                          Getters                         //
    //                                                          //
    //////////////////////////////////////////////////////////////

    /**
     * @notice  Get the KeyManager address/interface that's used to validate sigs
     * @return  The KeyManager (IKeyManager)
     */
    function getKeyManager() external view returns (IKeyManager);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;
import "IERC20.sol";

/**
 * @title    Shared interface
 * @notice   Holds structs needed by other interfaces
 */
interface IShared {
    /**
     * @dev  SchnorrSECP256K1 requires that each key has a public key part (x coordinate),
     *       a parity for the y coordinate (0 if the y ordinate of the public key is even, 1
     *       if it's odd)
     */
    struct Key {
        uint256 pubKeyX;
        uint8 pubKeyYParity;
    }

    /**
     * @dev  Contains a signature and the nonce used to create it. Also the recovered address
     *       to check that the signature is valid
     */
    struct SigData {
        uint256 sig;
        uint256 nonce;
        address kTimesGAddress;
    }

    /**
     * @param token The address of the token to be transferred
     * @param recipient The address of the recipient of the transfer
     * @param amount    The amount to transfer, in wei (uint)
     */
    struct TransferParams {
        address token;
        address payable recipient;
        uint256 amount;
    }

    /**
     * @param swapID    The unique identifier for this swap (bytes32), used for create2
     * @param token     The token to be transferred
     */
    struct DeployFetchParams {
        bytes32 swapID;
        address token;
    }

    /**
     * @param fetchContract   The address of the deployed Deposit contract
     * @param token     The token to be transferred
     */
    struct FetchParams {
        address payable fetchContract;
        address token;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "IShared.sol";

/**
 * @title    KeyManager interface
 * @notice   The interface for functions KeyManager implements
 */
interface IKeyManager is IShared {
    event AggKeySetByAggKey(Key oldAggKey, Key newAggKey);
    event AggKeySetByGovKey(Key oldAggKey, Key newAggKey);
    event GovKeySetByAggKey(address oldGovKey, address newGovKey);
    event GovKeySetByGovKey(address oldGovKey, address newGovKey);
    event CommKeySetByAggKey(address oldCommKey, address newCommKey);
    event CommKeySetByCommKey(address oldCommKey, address newCommKey);
    event SignatureAccepted(SigData sigData, address signer);
    event GovernanceAction(bytes32 message);

    //////////////////////////////////////////////////////////////
    //                                                          //
    //                  State-changing functions                //
    //                                                          //
    //////////////////////////////////////////////////////////////

    function consumeKeyNonce(SigData memory sigData, bytes32 contractMsgHash) external;

    function setAggKeyWithAggKey(SigData memory sigData, Key memory newAggKey) external;

    function setAggKeyWithGovKey(Key memory newAggKey) external;

    function setGovKeyWithAggKey(SigData calldata sigData, address newGovKey) external;

    function setGovKeyWithGovKey(address newGovKey) external;

    function setCommKeyWithAggKey(SigData calldata sigData, address newCommKey) external;

    function setCommKeyWithCommKey(address newCommKey) external;

    function govAction(bytes32 message) external;

    //////////////////////////////////////////////////////////////
    //                                                          //
    //                  Non-state-changing functions            //
    //                                                          //
    //////////////////////////////////////////////////////////////

    function getAggregateKey() external view returns (Key memory);

    function getGovernanceKey() external view returns (address);

    function getCommunityKey() external view returns (address);

    function isNonceUsedByAggKey(uint256 nonce) external view returns (bool);

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "IShared.sol";

/**
 * @title    GovernanceCommunityGuarded interface
 */

interface IGovernanceCommunityGuarded is IShared {
    event CommunityGuardDisabled(bool communityGuardDisabled);
    event Suspended(bool suspended);

    //////////////////////////////////////////////////////////////
    //                                                          //
    //                  State-changing functions                //
    //                                                          //
    //////////////////////////////////////////////////////////////
    /**
     * @notice  Enable Community Guard
     */

    function enableCommunityGuard() external;

    /**
     * @notice  Disable Community Guard
     */
    function disableCommunityGuard() external;

    /**
     * @notice  Can be used to suspend contract execution - only executable by
     *          governance and only to be used in case of emergency.
     */
    function suspend() external;

    /**
     * @notice      Resume contract execution
     */
    function resume() external;

    //////////////////////////////////////////////////////////////
    //                                                          //
    //                          Getters                         //
    //                                                          //
    //////////////////////////////////////////////////////////////

    /**
     * @notice  Get the Community Key
     * @return  The CommunityKey
     */
    function getCommunityKey() external view returns (address);

    /**
     * @notice  Get the Community Guard state
     * @return  The Community Guard state
     */
    function getCommunityGuardDisabled() external view returns (bool);

    /**
     * @notice  Get suspended state
     * @return  The suspended state
     */
    function getSuspendedState() external view returns (bool);

    /**
     * @notice  Get governor address
     * @return  The governor address
     */
    function getGovernor() external view returns (address);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "IFLIP.sol";

/**
 * @title    Flip Issuer interface
 * @notice   This interface is required when updating the FLIP issuer.
 *           Additionally, any contract inheriting this should implement the
 *           mint and burn capabilities to interact with the FLIP contract.
 */
interface IFlipIssuer {
    /**
     * @notice  Get the FLIP token address
     * @return  The address of FLIP
     */
    function getFLIP() external view returns (IFLIP);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "IKeyManager.sol";
import "IAggKeyNonceConsumer.sol";
import "Shared.sol";

/**
 * @title    AggKeyNonceConsumer contract
 * @notice   Manages the reference to the KeyManager contract. The address
 *           is set in the constructor and can only be updated with a valid
 *           signature validated by the current KeyManager contract. This shall
 *           be done if the KeyManager contract is updated.
 */
abstract contract AggKeyNonceConsumer is Shared, IAggKeyNonceConsumer {
    /// @dev    The KeyManager used to checks sigs used in functions here
    IKeyManager private _keyManager;

    constructor(IKeyManager keyManager) nzAddr(address(keyManager)) {
        _keyManager = keyManager;
    }

    //////////////////////////////////////////////////////////////
    //                                                          //
    //                  State-changing functions                //
    //                                                          //
    //////////////////////////////////////////////////////////////

    /**
     * @notice  Update KeyManager reference. Used if KeyManager contract is updated
     * @param sigData    Struct containing the signature data over the message
     *                   to verify, signed by the aggregate key.
     * @param keyManager New KeyManager's address
     * @param omitChecks Allow the omission of the extra checks in a special case
     */
    function updateKeyManager(
        SigData calldata sigData,
        IKeyManager keyManager,
        bool omitChecks
    )
        external
        override
        nzAddr(address(keyManager))
        consumesKeyNonce(sigData, keccak256(abi.encode(this.updateKeyManager.selector, keyManager, omitChecks)))
    {
        // Check that the new KeyManager is a contract
        require(address(keyManager).code.length > 0);

        // Allow the child to check compatibility with the new KeyManager
        _checkUpdateKeyManager(keyManager, omitChecks);

        _keyManager = keyManager;
        emit UpdatedKeyManager(address(keyManager));
    }

    /// @dev   This will be called when upgrading to a new KeyManager. This allows the child's contract
    ///        to check its compatibility with the new KeyManager. This is to prevent the contract from
    //         getting bricked. There is no good way to enforce the implementation of consumeKeyNonce().
    function _checkUpdateKeyManager(IKeyManager keyManager, bool omitChecks) internal view virtual;

    //////////////////////////////////////////////////////////////
    //                                                          //
    //                          Getters                         //
    //                                                          //
    //////////////////////////////////////////////////////////////

    /**
     * @notice  Get the KeyManager address/interface that's used to validate sigs
     * @return  The KeyManager (IKeyManager)
     */
    function getKeyManager() public view override returns (IKeyManager) {
        return _keyManager;
    }

    //////////////////////////////////////////////////////////////
    //                                                          //
    //                         Modifiers                        //
    //                                                          //
    //////////////////////////////////////////////////////////////

    /// @dev    Calls consumeKeyNonce in _keyManager
    modifier consumesKeyNonce(SigData calldata sigData, bytes32 contractMsgHash) {
        getKeyManager().consumeKeyNonce(sigData, contractMsgHash);
        _;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "IShared.sol";

/**
 * @title    Shared contract
 * @notice   Holds constants and modifiers that are used in multiple contracts
 * @dev      It would be nice if this could be a library, but modifiers can't be exported :(
 */

abstract contract Shared is IShared {
    /// @dev The address used to indicate whether transfer should send native or a token
    address internal constant _NATIVE_ADDR = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
    address internal constant _ZERO_ADDR = address(0);
    bytes32 internal constant _NULL = "";
    uint256 internal constant _E_18 = 1e18;

    /// @dev    Checks that a uint isn't zero/empty
    modifier nzUint(uint256 u) {
        require(u != 0, "Shared: uint input is empty");
        _;
    }

    /// @dev    Checks that an address isn't zero/empty
    modifier nzAddr(address a) {
        require(a != _ZERO_ADDR, "Shared: address input is empty");
        _;
    }

    /// @dev    Checks that a bytes32 isn't zero/empty
    modifier nzBytes32(bytes32 b) {
        require(b != _NULL, "Shared: bytes32 input is empty");
        _;
    }

    /// @dev    Checks that the pubKeyX is populated
    modifier nzKey(Key memory key) {
        require(key.pubKeyX != 0, "Shared: pubKeyX is empty");
        _;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "IGovernanceCommunityGuarded.sol";
import "AggKeyNonceConsumer.sol";
import "Shared.sol";

/**
 * @title    GovernanceCommunityGuarded contract
 * @notice   Allows the governor to perform certain actions for the procotol's safety in
 *           case of emergency. The aim is to allow the governor to suspend execution of
 *           critical functions.
 *           Also, it allows the CommunityKey to safeguard certain functions so the
 *           governor can execute them iff the communityKey allows it.
 */
abstract contract GovernanceCommunityGuarded is Shared, IGovernanceCommunityGuarded {
    /// @dev    Community Guard Disabled
    bool private _communityGuardDisabled;

    /// @dev    Whether execution is suspended
    bool private _suspended = false;

    /**
     * @notice  Get the governor's address. The contracts inheriting this (StateChainGateway and Vault)
     *          get the governor's address from the KeyManager through the AggKeyNonceConsumer's
     *          inheritance. Therefore, the implementation of this function must be left
     *          to the children. This is not implemented as a virtual onlyGovernor modifier to force
     *          the children to implement this function - virtual modifiers don't enforce that.
     * @return  The governor's address
     */
    function _getGovernor() internal view virtual returns (address);

    /**
     * @notice  Get the community's address. The contracts inheriting this (StateChainGateway and Vault)
     *          get the community's address from the KeyManager through the AggKeyNonceConsumer's
     *          inheritance. Therefore, the implementation of this function must be left
     *          to the children. This is not implemented as a virtual onlyCommunityKey modifier to force
     *          the children to implement this function - virtual modifiers don't enforce that.
     * @return  The community's address
     */
    function _getCommunityKey() internal view virtual returns (address);

    //////////////////////////////////////////////////////////////
    //                                                          //
    //                  State-changing functions                //
    //                                                          //
    //////////////////////////////////////////////////////////////

    /**
     * @notice  Enable Community Guard
     */
    function enableCommunityGuard() external override onlyCommunityKey onlyCommunityGuardDisabled {
        _communityGuardDisabled = false;
        emit CommunityGuardDisabled(false);
    }

    /**
     * @notice  Disable Community Guard
     */
    function disableCommunityGuard() external override onlyCommunityKey onlyCommunityGuardEnabled {
        _communityGuardDisabled = true;
        emit CommunityGuardDisabled(true);
    }

    /**
     * @notice Can be used to suspend contract execution - only executable by
     * governance and only to be used in case of emergency.
     */
    function suspend() external override onlyGovernor onlyNotSuspended {
        _suspended = true;
        emit Suspended(true);
    }

    /**
     * @notice      Resume contract execution
     */
    function resume() external override onlyGovernor onlySuspended {
        _suspended = false;
        emit Suspended(false);
    }

    //////////////////////////////////////////////////////////////
    //                                                          //
    //                          Getters                         //
    //                                                          //
    //////////////////////////////////////////////////////////////

    /**
     * @notice  Get the Community Key
     * @return  The CommunityKey
     */
    function getCommunityKey() external view override returns (address) {
        return _getCommunityKey();
    }

    /**
     * @notice  Get the Community Guard state
     * @return  The Community Guard state
     */
    function getCommunityGuardDisabled() external view override returns (bool) {
        return _communityGuardDisabled;
    }

    /**
     * @notice  Get suspended state
     * @return  The suspended state
     */
    function getSuspendedState() external view override returns (bool) {
        return _suspended;
    }

    /**
     * @notice  Get governor address
     * @return  The governor address
     */
    function getGovernor() external view override returns (address) {
        return _getGovernor();
    }

    //////////////////////////////////////////////////////////////
    //                                                          //
    //                         Modifiers                        //
    //                                                          //
    //////////////////////////////////////////////////////////////

    /// @dev    Check that the caller is the Community Key address.
    modifier onlyCommunityKey() {
        require(msg.sender == _getCommunityKey(), "Governance: not Community Key");
        _;
    }

    /// @dev    Check that community has disabled the community guard.
    modifier onlyCommunityGuardDisabled() {
        require(_communityGuardDisabled, "Governance: community guard enabled");
        _;
    }

    /// @dev    Check that community has disabled the community guard.
    modifier onlyCommunityGuardEnabled() {
        require(!_communityGuardDisabled, "Governance: community guard disabled");
        _;
    }

    /// @notice Ensure that the caller is the governor address. Calls the getGovernor
    ///         function which is implemented by the children.
    modifier onlyGovernor() {
        require(msg.sender == _getGovernor(), "Governance: not governor");
        _;
    }

    // @notice Check execution is suspended
    modifier onlySuspended() {
        require(_suspended, "Governance: not suspended");
        _;
    }

    // @notice Check execution is not suspended
    modifier onlyNotSuspended() {
        require(!_suspended, "Governance: suspended");
        _;
    }
}

{
  "evmVersion": "paris",
  "optimizer": {
    "enabled": true,
    "runs": 800
  },
  "libraries": {
    "StateChainGateway.sol": {}
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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IKeyManager","name":"keyManager","type":"address"},{"internalType":"uint256","name":"minFunding","type":"uint256"},{"internalType":"uint48","name":"redemptionDelay","type":"uint48"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bool","name":"communityGuardDisabled","type":"bool"}],"name":"CommunityGuardDisabled","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"flip","type":"address"}],"name":"FLIPSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"oldSupply","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"newSupply","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"stateChainBlockNumber","type":"uint256"}],"name":"FlipSupplyUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"nodeID","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"address","name":"funder","type":"address"}],"name":"Funded","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"GovernanceWithdrawal","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"oldMinFunding","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"newMinFunding","type":"uint256"}],"name":"MinFundingChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"nodeID","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"RedemptionExecuted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"nodeID","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"RedemptionExpired","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"nodeID","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":true,"internalType":"address","name":"redeemAddress","type":"address"},{"indexed":false,"internalType":"uint48","name":"startTime","type":"uint48"},{"indexed":false,"internalType":"uint48","name":"expiryTime","type":"uint48"},{"indexed":false,"internalType":"address","name":"executor","type":"address"}],"name":"RedemptionRegistered","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bool","name":"suspended","type":"bool"}],"name":"Suspended","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"keyManager","type":"address"}],"name":"UpdatedKeyManager","type":"event"},{"inputs":[],"name":"REDEMPTION_DELAY","outputs":[{"internalType":"uint48","name":"","type":"uint48"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"disableCommunityGuard","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"enableCommunityGuard","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"nodeID","type":"bytes32"}],"name":"executeRedemption","outputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"nodeID","type":"bytes32"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"fundStateChainAccount","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getCommunityGuardDisabled","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getCommunityKey","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getFLIP","outputs":[{"internalType":"contract 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IShared.SigData","name":"sigData","type":"tuple"},{"internalType":"address","name":"newIssuer","type":"address"},{"internalType":"bool","name":"omitChecks","type":"bool"}],"name":"updateFlipIssuer","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"components":[{"internalType":"uint256","name":"sig","type":"uint256"},{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"address","name":"kTimesGAddress","type":"address"}],"internalType":"struct IShared.SigData","name":"sigData","type":"tuple"},{"internalType":"uint256","name":"newTotalSupply","type":"uint256"},{"internalType":"uint256","name":"stateChainBlockNumber","type":"uint256"}],"name":"updateFlipSupply","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"components":[{"internalType":"uint256","name":"sig","type":"uint256"},{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"address","name":"kTimesGAddress","type":"address"}],"internalType":"struct IShared.SigData","name":"sigData","type":"tuple"},{"internalType":"contract IKeyManager","name":"keyManager","type":"address"},{"internalType":"bool","name":"omitChecks","type":"bool"}],"name":"updateKeyManager","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000cd351d3626dc244730796a3168d315168ebf08be0000000000000000000000000000000000000000000000000de0b6b3a7640000000000000000000000000000000000000000000000000000000000000002a300

-----Decoded View---------------
Arg [0] : keyManager (address): 0xcd351d3626Dc244730796A3168D315168eBf08Be
Arg [1] : minFunding (uint256): 1000000000000000000
Arg [2] : redemptionDelay (uint48): 172800

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000cd351d3626dc244730796a3168d315168ebf08be
Arg [1] : 0000000000000000000000000000000000000000000000000de0b6b3a7640000
Arg [2] : 000000000000000000000000000000000000000000000000000000000002a300