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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";
import "@routerprotocol/evm-gateway-contracts/contracts/IGateway.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";
import "./interfaces/IAssetBridge.sol";
import "@routerprotocol/asset-forwarder/src/interfaces/IMessageHandler.sol";
import "./interfaces/IDexSpan.sol";
import "./interfaces/IWETH.sol";
import "./interfaces/IBurnableERC20.sol";
import "./ReentrancyGuard.sol";

/// @title Handles ERC20 deposits and relay executions.
/// @author Router Protocol.
/// @notice This contract is intended to be used with the Bridge contract.
contract AssetBridge is Context, AccessControl, ReentrancyGuard, Pausable, IAssetBridge {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    bytes32 public constant RESOURCE_SETTER = keccak256("RESOURCE_SETTER");
    bytes32 public constant PAUSER = keccak256("PAUSER");

    // NOTE: Change chainId everytime we deploy
    string public constant ROUTER_CHAIN_ID = "router_9600-1";
    bytes32 public constant ROUTER_CHAIN_ID_BYTES = keccak256(bytes(ROUTER_CHAIN_ID));
    // only dest gas limit specified 6 mill, rest is 0
    bytes public constant AssetBridge_REQUEST_METADATA =
        hex"00000000005B8D80000000000000000000000000000000000000000000000000000000000000000000000000000000000000";

    address private constant ETH_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
    // Instance of the gateway contract
    IGateway public immutable gateway;
    IDexSpan public dexSpan;

    // NOTE: Change ROUTER_BRIDGE_ADDRESS everytime we deploy
    string public constant ROUTER_BRIDGE_ADDRESS = "router17p9rzwnnfxcjp32un9ug7yhhzgtkhvl9jfksztgw5uh69wac2pgsmpev85";
    bytes32 public constant ROUTER_BRIDGE_ADDRESS_BYTES = keccak256(bytes(ROUTER_BRIDGE_ADDRESS));
    address public immutable wrappedNative;
    uint256 public depositNonce;
    // keccak256(abi.encode(destChainId)) + depositNonce => Revert Executed?
    mapping(bytes32 => mapping(uint256 => bool)) public _executionRevertCompleted;
    // token => isBurnable
    mapping(address => address) public _contractToLP;
    mapping(address => address) public _lpToContract;

    // token contract address => is reserve
    mapping(address => uint256) public _tokenWhitelist;

    // keccak256(abi.encode(sourceChainId)) + nonce => isExecuted
    mapping(bytes32 => mapping(uint256 => bool)) public executeRecord;

    // codeId:
    // 1 -> Only Gateway contract
    // 2 -> array length mismatch
    // 3 -> contract address cannot be zero address
    // 4 -> provided contract is not whitelisted
    // 5 -> Either reserve handler or dest caller address is zero address
    // 6 -> Insufficient native assets sent
    // 7 -> token not whitelisted
    // 8 -> min amount lower than required
    // 9 -> invalid data
    // 10 -> invalid token addresses
    // 11 -> data for reserve transfer
    // 12 -> data for LP transfer
    // 13 -> only AssetBridge middleware
    // 14 -> already reverted
    // 15 -> no deposit found
    // 16 -> dest chain not configured
    // 17 -> InvalidChainID
    // 18 -> InvalidMiddlewareAddress
    error AssetBridgeError(uint8 codeId);

    modifier isGateway() {
        if (msg.sender != address(gateway)) {
            // Only gateway contracts
            revert AssetBridgeError(1);
        }
        _;
    }

    modifier isLengthSame(uint256 l1, uint256 l2) {
        if (l1 != l2) {
            // array length mismatch
            revert AssetBridgeError(2);
        }
        _;
    }

    constructor(
        address _dexSpan,
        address _wrappedNative,
        address _gatewayAddress,
        string memory chainId,
        string memory routerBridgeAddress,
        uint256 startNonce
    ) {
        _setupRole(DEFAULT_ADMIN_ROLE, msg.sender);
        _setupRole(RESOURCE_SETTER, msg.sender);
        _setupRole(PAUSER, msg.sender);

        dexSpan = IDexSpan(_dexSpan);
        wrappedNative = _wrappedNative;
        gateway = IGateway(_gatewayAddress);

        if (ROUTER_CHAIN_ID_BYTES != keccak256(bytes(chainId))) {
            revert AssetBridgeError(17);
        }
        if (ROUTER_BRIDGE_ADDRESS_BYTES != keccak256(bytes(routerBridgeAddress))) {
            revert AssetBridgeError(18);
        }
        depositNonce = startNonce;
    }

    /// @notice Pauses deposits on the handler.
    /// @notice Only callable by an address that currently has the PAUSER role.
    function pause() external onlyRole(PAUSER) whenNotPaused {
        _pause();
    }

    /// @notice Unpauses deposits on the handler.
    /// @notice Only callable by an address that currently has the PAUSER role.
    function unpause() external onlyRole(PAUSER) whenPaused {
        _unpause();
    }

    function isNative(address token) internal pure returns (bool) {
        return token == ETH_ADDRESS;
    }

    function setLiquidityPoolMulti(
        address[] memory _tokens,
        address[] memory _lptokens
    ) public onlyRole(RESOURCE_SETTER) isLengthSame(_tokens.length, _lptokens.length) {
        uint8 length = uint8(_tokens.length);
        for (uint8 i = 0; i < length; i++) {
            require((_tokenWhitelist[_tokens[i]] != 0), "provided some token is not whitelisted");
            _lpToContract[_lptokens[i]] = _tokens[i];
            _contractToLP[_tokens[i]] = _lptokens[i];
        }
    }

    function setWhiteListTokenMulti(
        address[] memory _tokens,
        uint256[] memory types
    ) public onlyRole(RESOURCE_SETTER) isLengthSame(_tokens.length, types.length) {
        uint8 length = uint8(_tokens.length);
        for (uint8 i = 0; i < length; i++) {
            if (_tokens[i] == address(0)) {
                // token address can't be zero
                revert AssetBridgeError(3);
            }
            _tokenWhitelist[_tokens[i]] = types[i];
        }
    }

    function setDappMetadata(string memory feePayer) external payable onlyRole(RESOURCE_SETTER) {
        gateway.setDappMetadata{ value: msg.value }(feePayer);
    }

    /// @notice Sets DexSpan address.
    /// @param _dexSpan Address of DexSpan contract
    function setDexSpanAddress(address _dexSpan) external onlyRole(RESOURCE_SETTER) {
        if (_dexSpan == address(0)) {
            // contract address cannot be zero address
            revert AssetBridgeError(3);
        }
        dexSpan = IDexSpan(_dexSpan);
    }

    function iSend(bytes memory packet, uint256 value) internal {
        bytes memory requestPacket = abi.encode(ROUTER_BRIDGE_ADDRESS, packet);
        gateway.iSend{ value: value }(1, 0, "", ROUTER_CHAIN_ID, AssetBridge_REQUEST_METADATA, requestPacket);
    }

    function getTransferPacket(
        bytes32 destChainIdBytes,
        address srcTokenAddress,
        uint256 srcTokenAmount,
        bytes memory recipient,
        uint256 partnerId
    ) internal returns (bytes memory) {
        unchecked {
            ++depositNonce;
        }
        return
            abi.encode(
                uint8(0),
                destChainIdBytes,
                srcTokenAddress,
                srcTokenAmount,
                msg.sender,
                recipient,
                depositNonce,
                partnerId
            );
    }

    function getTransferWithInstructionPacket(
        bytes32 destChainIdBytes,
        address srcTokenAddress,
        uint256 srcTokenAmount,
        bytes memory recipient,
        uint256 partnerId,
        uint64 gasLimit,
        bytes calldata instruction
    ) internal returns (bytes memory) {
        unchecked {
            ++depositNonce;
        }
        return
            abi.encode(
                uint8(1),
                destChainIdBytes,
                srcTokenAddress,
                srcTokenAmount,
                msg.sender,
                recipient,
                depositNonce,
                partnerId,
                gasLimit,
                instruction
            );
    }

    function tokenAndAmountValidation(address token) internal view {
        if (_tokenWhitelist[token] == 0) {
            revert AssetBridgeError(7); // token not whitelisted
        }
    }

    function safeTransferETH(address to, uint256 value) internal {
        require(to != address(0), "safeTransferETH: transfer to address 0");
        (bool success, ) = to.call{ value: value }(new bytes(0));
        require(success, "safeTransferETH: ETH transfer failed");
    }

    function safeTransferFrom(address token, address from, address to, uint256 amount) internal {
        if (from == address(this)) {
            IERC20(token).transfer(to, amount);
        } else {
            IERC20(token).transferFrom(from, to, amount);
        }
    }

    function lockOrBurnToken(address token, address from, uint256 amount) internal {
        uint256 tokenType = _tokenWhitelist[token];
        if (tokenType == 1) {
            if (from != address(this)) safeTransferFrom(token, from, address(this), amount);
        } else if ( tokenType == 2) {
            // Old ERC20 Contracts
            IBurnableERC20V1(token).burn(from,amount);
        } else if ( tokenType == 3) {
            // New ERC20 Contracts
            if (from == address(this)) {
                IBurnableERC20V2(token).burn(amount);
            } else {
                IBurnableERC20V2(token).burnFrom(from, amount);
            }
        } else {
            revert AssetBridgeError(7); // token not whitelisted 
        }
    }

    function transferToken(TransferPayload memory transferPayload) external nonReentrant payable whenNotPaused {
        tokenAndAmountValidation(transferPayload.srcTokenAddress);
        bool isSourceNative = isNative(transferPayload.srcTokenAddress);
        if (!isSourceNative)
            lockOrBurnToken(transferPayload.srcTokenAddress, msg.sender, transferPayload.srcTokenAmount);
        else {
            if (msg.value < transferPayload.srcTokenAmount) {
                // No native assets sent
                revert AssetBridgeError(6);
            }
            IWETH(wrappedNative).deposit{ value: transferPayload.srcTokenAmount }();
            transferPayload.srcTokenAddress = wrappedNative;
        }
        bytes memory packet = getTransferPacket(
            transferPayload.destChainIdBytes,
            transferPayload.srcTokenAddress,
            transferPayload.srcTokenAmount,
            transferPayload.recipient,
            transferPayload.partnerId
        );
        if (!isSourceNative) iSend(packet, msg.value);
        else iSend(packet, msg.value.sub(transferPayload.srcTokenAmount));

        emit TokenTransfer(
            transferPayload.destChainIdBytes,
            transferPayload.srcTokenAddress,
            transferPayload.srcTokenAmount,
            transferPayload.recipient,
            transferPayload.partnerId,
            depositNonce
        );
    }

    function transferTokenWithInstruction(
        TransferPayload memory transferPayload,
        uint64 destGasLimit,
        bytes calldata instruction
    ) external nonReentrant payable whenNotPaused {
        tokenAndAmountValidation(transferPayload.srcTokenAddress);
        bool isSourceNative = isNative(transferPayload.srcTokenAddress);
        if (!isSourceNative)
            lockOrBurnToken(transferPayload.srcTokenAddress, msg.sender, transferPayload.srcTokenAmount);
        else {
            if (msg.value < transferPayload.srcTokenAmount) {
                // No native assets sent
                revert AssetBridgeError(6);
            }
            IWETH(wrappedNative).deposit{ value: transferPayload.srcTokenAmount }();
            transferPayload.srcTokenAddress = wrappedNative;
        }
        bytes memory packet = getTransferWithInstructionPacket(
            transferPayload.destChainIdBytes,
            transferPayload.srcTokenAddress,
            transferPayload.srcTokenAmount,
            transferPayload.recipient,
            transferPayload.partnerId,
            destGasLimit,
            instruction
        );
        if (!isSourceNative) iSend(packet, msg.value);
        else iSend(packet, msg.value.sub(transferPayload.srcTokenAmount));

        emit TokenTransferWithInstruction(
            transferPayload.destChainIdBytes,
            transferPayload.srcTokenAddress,
            transferPayload.srcTokenAmount,
            transferPayload.recipient,
            transferPayload.partnerId,
            destGasLimit,
            instruction,
            depositNonce
        );
    }

    function swapAndTransferToken(
        SwapTransferPayload memory transferPayload
    ) external nonReentrant payable whenNotPaused {
        bool isSourceNative = isNative(transferPayload.tokens[0]);
        if (!isSourceNative)
            safeTransferFrom(transferPayload.tokens[0], msg.sender, address(dexSpan), transferPayload.srcTokenAmount);
        else {
            if (msg.value < transferPayload.srcTokenAmount) {
                // No native assets sent
                revert AssetBridgeError(6);
            }
            IWETH(wrappedNative).deposit{ value: transferPayload.srcTokenAmount }();
            IWETH(wrappedNative).transfer(address(dexSpan), transferPayload.srcTokenAmount);
            transferPayload.tokens[0] = wrappedNative;
        }
        address toToken = transferPayload.tokens[transferPayload.tokens.length - 1];
        uint256 oldBalance = IBurnableERC20V2(toToken).balanceOf(address(this));
        uint256 returnAmount = dexSpan.swapMultiWithRecipient(
            transferPayload.tokens,
            transferPayload.srcTokenAmount,
            transferPayload.minToAmount,
            transferPayload.flags,
            transferPayload.dataTx,
            true,
            address(this)
        );
        uint256 newBalance = IBurnableERC20V2(toToken).balanceOf(address(this));
        assert(oldBalance + returnAmount == newBalance);
        tokenAndAmountValidation(toToken);
        lockOrBurnToken(toToken, address(this), returnAmount);
        bytes memory packet = getTransferPacket(
            transferPayload.destChainIdBytes,
            toToken,
            returnAmount,
            transferPayload.recipient,
            transferPayload.partnerId
        );
        if (!isSourceNative) iSend(packet, msg.value);
        else iSend(packet, msg.value.sub(transferPayload.srcTokenAmount));

        emit TokenTransfer(
            transferPayload.destChainIdBytes,
            toToken,
            returnAmount,
            transferPayload.recipient,
            transferPayload.partnerId,
            depositNonce
        );
    }

    function swapAndTransferTokenWithInstruction(
        SwapTransferPayload memory transferPayload,
        uint64 destGasLimit,
        bytes calldata instruction
    ) external nonReentrant payable whenNotPaused {
        bool isSourceNative = isNative(transferPayload.tokens[0]);
        if (!isSourceNative)
            safeTransferFrom(transferPayload.tokens[0], msg.sender, address(dexSpan), transferPayload.srcTokenAmount);
        else {
            if (msg.value < transferPayload.srcTokenAmount) {
                // No native assets sent
                revert AssetBridgeError(6);
            }
            IWETH(wrappedNative).deposit{ value: transferPayload.srcTokenAmount }();
            IWETH(wrappedNative).transfer(address(dexSpan), transferPayload.srcTokenAmount);
            transferPayload.tokens[0] = wrappedNative;
        }
        address toToken = transferPayload.tokens[transferPayload.tokens.length - 1];
        uint256 oldBalance = IBurnableERC20V2(toToken).balanceOf(address(this));
        uint256 returnAmount = dexSpan.swapMultiWithRecipient(
            transferPayload.tokens,
            transferPayload.srcTokenAmount,
            transferPayload.minToAmount,
            transferPayload.flags,
            transferPayload.dataTx,
            true,
            address(this)
        );
        uint256 newBalance = IBurnableERC20V2(toToken).balanceOf(address(this));
        assert(oldBalance + returnAmount == newBalance);
        tokenAndAmountValidation(toToken);
        lockOrBurnToken(toToken, address(this), returnAmount);
        bytes memory packet = getTransferWithInstructionPacket(
            transferPayload.destChainIdBytes,
            toToken,
            returnAmount,
            transferPayload.recipient,
            transferPayload.partnerId,
            destGasLimit,
            instruction
        );
        if (!isSourceNative) iSend(packet, msg.value);
        else iSend(packet, msg.value.sub(transferPayload.srcTokenAmount));

        emit TokenTransferWithInstruction(
            transferPayload.destChainIdBytes,
            toToken,
            returnAmount,
            transferPayload.recipient,
            transferPayload.partnerId,
            destGasLimit,
            instruction,
            depositNonce
        );
    }

    /// @notice Function to handle the request for execution received from Router Chain
    /// @param requestSender Address of the sender of the transaction on the source chain.
    /// @param srcChainId request source chain id.
    /// @param packet Packet coming from the router chain.
    function iReceive(
        string memory requestSender,
        bytes memory packet,
        string memory srcChainId
    ) external isGateway nonReentrant whenNotPaused {
        if (keccak256(bytes(srcChainId)) != ROUTER_CHAIN_ID_BYTES) {
            // only AssetBridge middleware
            revert AssetBridgeError(13);
        }
        if (keccak256(bytes(requestSender)) != ROUTER_BRIDGE_ADDRESS_BYTES) {
            // only AssetBridge middleware
            revert AssetBridgeError(17);
        }

        uint8 txType = abi.decode(packet, (uint8));
        // Refunding deposited token in case of some issues on dest chain
        if (txType == 2) {
            (, bytes32 destChainIdBytes, IAssetBridge.DepositData memory depositData) = abi.decode(
                packet,
                (uint8, bytes32, IAssetBridge.DepositData)
            );
            if (_executionRevertCompleted[destChainIdBytes][depositData.depositNonce]) {
                // already reverted
                revert AssetBridgeError(14);
            }
            if (depositData.srcTokenAddress == address(0)) {
                // no deposit found
                revert AssetBridgeError(15);
            }
            _executionRevertCompleted[destChainIdBytes][depositData.depositNonce] = true;

            executeProposalForReserveToken(depositData.srcTokenAddress, depositData.srcTokenAmount, depositData.sender);
            emit DepositReverted(
                destChainIdBytes,
                depositData.depositNonce,
                depositData.sender,
                depositData.srcTokenAddress,
                depositData.srcTokenAmount
            );
            return;
        }

        if (txType == 0) {
            // mint token
            (, bytes32 srcChainIdBytes, IAssetBridge.ExecuteInfo memory executeDetails) = abi.decode(
                packet,
                (uint8, bytes32, IAssetBridge.ExecuteInfo)
            );
            require(!executeRecord[srcChainIdBytes][executeDetails.depositNonce], "already executed");
            executeRecord[srcChainIdBytes][executeDetails.depositNonce] = true;

            executeProposalForReserveToken(
                executeDetails.destTokenAddress,
                executeDetails.destTokenAmount,
                executeDetails.recipient
            );
            emit Execute(
                0,
                srcChainIdBytes,
                executeDetails.depositNonce,
                executeDetails.destTokenAddress,
                executeDetails.destTokenAmount,
                executeDetails.recipient
            );
            return;
        }

        if (txType == 1) {
            // mint token and execute
            (, bytes32 srcChainIdBytes, IAssetBridge.ExecuteInfo memory executeDetails, bytes memory instruction) = abi
                .decode(packet, (uint8, bytes32, IAssetBridge.ExecuteInfo, bytes));
            require(!executeRecord[srcChainIdBytes][executeDetails.depositNonce], "already executed");
            executeRecord[srcChainIdBytes][executeDetails.depositNonce] = true;

            executeProposalForReserveToken(
                executeDetails.destTokenAddress,
                executeDetails.destTokenAmount,
                executeDetails.recipient
            );
            (bool success, bytes memory data) = executeDetails.recipient.call(
                abi.encodeWithSelector(
                    IMessageHandler.handleMessage.selector, // function handleAssetBridgeMessage(address tokenSent, uint256 amount, bytes memory instruction) external;
                    executeDetails.destTokenAddress,
                    executeDetails.destTokenAmount,
                    instruction
                )
            );
            //TODO: do we need any check on data and success
            //TODO: there should be min gas left after call

            emit ExecuteWithMessage(
                1,
                srcChainIdBytes,
                executeDetails.depositNonce,
                executeDetails.destTokenAddress,
                executeDetails.destTokenAmount,
                executeDetails.recipient,
                success,
                data
            );
            return;
        }
    }

    function executeProposalForReserveToken(address token, uint256 amount, address recipient) internal {
        uint256 tokenType = _tokenWhitelist[token];
        require((tokenType != 0), "token not whitelisted");
        if (tokenType != 1) {
            IBurnableERC20V2(token).mint(recipient, amount);
        } else {
            uint256 reserveBalance;
            if (isNative(token)) {
                reserveBalance = address(this).balance;
            } else {
                reserveBalance = IBurnableERC20V2(token).balanceOf(address(this));
            }
            if (reserveBalance < amount) {
                require(_contractToLP[token] != address(0), "ERC20Handler: Liquidity pool not found");
                IBurnableERC20V2(_contractToLP[token]).mint(recipient, amount);
                // will there is liquidity provider type of concept here?
            } else {
                if (isNative(token)) {
                    IWETH(wrappedNative).withdraw(amount);
                    (bool success, ) = recipient.call{ value: amount }("");
                    require(success, "Transfer failed.");
                } else safeTransferFrom(token, address(this), recipient, amount);
            }
        }
    }

    /// @notice Used to stake ERC20 tokens into the LP.
    /// @param tokenAddress Address of the ERC20 token
    /// @param amount Amount of tokens to be staked
    function stake(
        address to,
        bool isSourceNative,
        address tokenAddress,
        uint256 amount
    ) external payable whenNotPaused {
        require(_contractToLP[tokenAddress] != address(0), "LP not created");
        if (isSourceNative && tokenAddress == wrappedNative) {
            require(amount == msg.value, "amount != msg.value");
            IWETH(wrappedNative).deposit{ value: msg.value }();
            IBurnableERC20V2(_contractToLP[tokenAddress]).mint(to, msg.value);
        } else {
            require(msg.value == 0, "No need to pass Native Tokens");
            safeTransferFrom(tokenAddress, msg.sender, address(this), amount);
            IBurnableERC20V2(_contractToLP[tokenAddress]).mint(to, amount);
        }
    }

    /// @notice Unstake the ERC20 tokens from LP.
    /// @param tokenAddress staking token of which liquidity needs to be removed.
    /// @param amount Amount that needs to be unstaked.
    function unstake(address to, bool isSourceNative, address tokenAddress, uint256 amount) external whenNotPaused {
        require(_lpToContract[tokenAddress] != address(0), "LP not created");
        if (isSourceNative && _lpToContract[tokenAddress] == wrappedNative) {
            IBurnableERC20V2(tokenAddress).burnFrom(msg.sender, amount);
            IWETH(wrappedNative).withdraw(amount);
            safeTransferETH(to, amount);
        } else {
            IBurnableERC20V2(tokenAddress).burnFrom(msg.sender, amount);
            safeTransferFrom(_lpToContract[tokenAddress], address(this), to, amount);
        }
    }

    //TODO: we should remove this
    /// @notice Function to withdraw funds from this contract.
    /// @notice Only DEFAULT_ADMIN can call this function.
    /// @param  token Address of token to withdraw. If native token, send address 0.
    /// @param  amount Amount of tokens to withdraw. If all tokens, send 0.
    /// @param  recipient Address of recipient.
    function withdrawFunds(
        address token,
        uint256 amount,
        address payable recipient
    ) external onlyRole(DEFAULT_ADMIN_ROLE) {
        if (token == address(0)) {
            amount = amount != 0 ? amount : address(this).balance;
            safeTransferETH(recipient, amount);
        } else {
            IBurnableERC20V2 _token = IBurnableERC20V2(token);
            amount = amount != 0 ? amount : _token.balanceOf(address(this));
            safeTransferFrom(token, address(this), recipient, amount);
        }
    }
}

// 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 v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

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

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/extensions/ERC20Burnable.sol)

pragma solidity ^0.8.0;

import "../ERC20.sol";
import "../../../utils/Context.sol";

/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        _spendAllowance(account, _msgSender(), amount);
        _burn(account, amount);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0 <0.9.0;

import "./Utils.sol";

/**
 * @dev Interface of the Gateway Self External Calls.
 */
interface IGateway {
    // requestMetadata = abi.encodePacked(
    //     uint256 destGasLimit;
    //     uint256 destGasPrice;
    //     uint256 ackGasLimit;
    //     uint256 ackGasPrice;
    //     uint256 relayerFees;
    //     uint8 ackType;
    //     bool isReadCall;
    //     bytes asmAddress;
    // )

    function iSend(
        uint256 version,
        uint256 routeAmount,
        string calldata routeRecipient,
        string calldata destChainId,
        bytes calldata requestMetadata,
        bytes calldata requestPacket
    ) external payable returns (uint256);

    function setDappMetadata(string memory feePayerAddress) external payable returns (uint256);

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/AccessControl.sol)

pragma solidity ^0.8.0;

import "./IAccessControl.sol";
import "../utils/Context.sol";
import "../utils/Strings.sol";
import "../utils/introspection/ERC165.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```solidity
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```solidity
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it. We recommend using {AccessControlDefaultAdminRules}
 * to enforce additional security measures for this role.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view virtual override returns (bool) {
        return _roles[role].members[account];
    }

    /**
     * @dev Revert with a standard message if `_msgSender()` is missing `role`.
     * Overriding this function changes the behavior of the {onlyRole} modifier.
     *
     * Format of the revert message is described in {_checkRole}.
     *
     * _Available since v4.6._
     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(account),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view virtual override returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleGranted} event.
     */
    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleRevoked} event.
     */
    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     *
     * May emit a {RoleRevoked} event.
     */
    function renounceRole(bytes32 role, address account) public virtual override {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * May emit a {RoleGranted} event.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     *
     * NOTE: This function is deprecated in favor of {_grantRole}.
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleGranted} event.
     */
    function _grantRole(bytes32 role, address account) internal virtual {
        if (!hasRole(role, account)) {
            _roles[role].members[account] = true;
            emit RoleGranted(role, account, _msgSender());
        }
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleRevoked} event.
     */
    function _revokeRole(bytes32 role, address account) internal virtual {
        if (hasRole(role, account)) {
            _roles[role].members[account] = false;
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

/// @title Interface for Voyager contracts that support deposits and deposit executions.
/// @author Router Protocol.
interface IAssetBridge {
    //TODO: can remove some field to optimize gas
    event TokenTransfer(
        bytes32 indexed destChainIdBytes,
        address indexed srcTokenAddress,
        uint256 srcTokenAmount,
        bytes recipient,
        uint256 partnerId,
        uint256 depositId
    );

    //TODO: can remove some field to optimize gas
    event TokenTransferWithInstruction(
        bytes32 indexed destChainIdBytes,
        address indexed srcTokenAddress,
        uint256 srcTokenAmount,
        bytes recipient,
        uint256 partnerId,
        uint64 destGasLimit,
        bytes instruction,
        uint256 depositId
    );

    event DepositReverted(
        bytes32 indexed destChainIdBytes,
        uint256 indexed depositNonce,
        address indexed sender,
        address srcSettlementToken,
        uint256 srcSettlementAmount
    );

    event Execute(
        uint8 executeType,
        bytes32 indexed sourceChainIdBytes,
        uint256 indexed depositNonce,
        address settlementToken,
        uint256 settlementAmount,
        address recipient
    );

    event ExecuteWithMessage(
        uint8 executeType,
        bytes32 indexed sourceChainIdBytes,
        uint256 indexed depositNonce,
        address settlementToken,
        uint256 settlementAmount,
        address recipient,
        bool flag,
        bytes data
    );
    struct ExecuteInfo {
        address recipient;
        address destTokenAddress;
        uint256 destTokenAmount;
        uint256 depositNonce;
    }

    struct DepositData {
        address sender;
        address srcTokenAddress;
        uint256 srcTokenAmount;
        uint256 depositNonce;
    }

    struct TransferPayload {
        bytes32 destChainIdBytes;
        address srcTokenAddress;
        uint256 srcTokenAmount;
        bytes recipient;
        uint256 partnerId;
    }
    
    struct SwapTransferPayload {
        bytes32 destChainIdBytes;
        address[] tokens; // index 0 will be src token and index n-1 will be to address
        uint256[] flags;
        bytes[] dataTx;
        uint256 srcTokenAmount;
        uint256 minToAmount;
        bytes recipient;
        uint256 partnerId;
    }

    function transferTokenWithInstruction(
        TransferPayload memory transferPayload,
        uint64 destGasLimit,
        bytes calldata instruction
    ) external payable;

    function transferToken(TransferPayload memory transferPayload) external payable;

    function swapAndTransferToken(SwapTransferPayload memory transferPayload) external payable;

    function swapAndTransferTokenWithInstruction(
        SwapTransferPayload memory transferPayload,
        uint64 destGasLimit,
        bytes calldata instruction
    ) external payable;
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.18;

/// @title Handles ERC20 deposits and deposit executions.
/// @author Router Protocol.
/// @notice This contract is intended to be used with the Bridge contract.
interface IMessageHandler {
    function handleMessage(
        address tokenSent,
        uint256 amount,
        bytes memory message
    ) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

contract IDexSpanConsts {
    // flags = FLAG_DISABLE_UNISWAP + FLAG_DISABLE_BANCOR + ...
    uint256 internal constant FLAG_DISABLE_UNISWAP = 0x400;
    uint256 internal constant FLAG_DISABLE_SPLIT_RECALCULATION = 0x800000000000;
    uint256 internal constant FLAG_DISABLE_ALL_SPLIT_SOURCES = 0x20000000;
    uint256 internal constant FLAG_DISABLE_UNISWAP_V2_ALL = 0x400;
    uint256 internal constant FLAG_DISABLE_EMPTY = 0x100000000000;

    uint256 internal constant FLAG_DISABLE_DFYN = 0x800;
    uint256 internal constant FLAG_DISABLE_PANCAKESWAP = 0x80;
    uint256 internal constant FLAG_DISABLE_QUICKSWAP = 0x40000000000;
    uint256 internal constant FLAG_DISABLE_SUSHISWAP = 0x1000000;
    uint256 internal constant FLAG_DISABLE_ONEINCH = 0x100000;
}

abstract contract IDexSpan is IDexSpanConsts {
    function getExpectedReturn(
        address fromToken,
        address destToken,
        uint256 amount,
        uint256 parts,
        uint256 flags // See constants in IOneSplit.sol
    ) public view virtual returns (uint256 returnAmount, uint256[] memory distribution);

    function getExpectedReturnWithGasMulti(
        address[] memory tokens,
        uint256 amount,
        uint256[] memory parts,
        uint256[] memory flags,
        uint256[] memory destTokenEthPriceTimesGasPrices
    )
        public
        view
        virtual
        returns (uint256[] memory returnAmounts, uint256 estimateGasAmount, uint256[] memory distribution);

    function getExpectedReturnWithGas(
        address fromToken,
        address destToken,
        uint256 amount,
        uint256 parts,
        uint256 flags, // See constants in IOneSplit.sol
        uint256 destTokenEthPriceTimesGasPrice
    ) public view virtual returns (uint256 returnAmount, uint256 estimateGasAmount, uint256[] memory distribution);

    function setHandlerAddress(address _handlerAddress) external virtual returns (bool);

    function setReserveAddress(address _reserveAddress) external virtual returns (bool);

    function setBridgeAddress(address _bridgeAddress) external virtual returns (bool);

    function withdraw(address tokenAddress, address recipient, uint256 amount) public payable virtual returns (bool);

    function swap(
        address fromToken,
        address destToken,
        uint256 amount,
        uint256 minReturn,
        uint256 flags,
        bytes memory dataTx,
        bool isWrapper
    ) public payable virtual returns (uint256 returnAmount);

    function swapWithRecipient(
        address fromToken,
        address destToken,
        uint256 amount,
        uint256 minReturn,
        uint256 flags,
        bytes memory dataTx,
        bool isWrapper,
        address recipient
    ) public payable virtual returns (uint256 returnAmount);

    function swapMulti(
        address[] memory tokens,
        uint256 amount,
        uint256 minReturn,
        uint256[] memory flags,
        bytes[] memory dataTx,
        bool isWrapper
    ) public payable virtual returns (uint256 returnAmount);

    function swapMultiWithRecipient(
        address[] memory tokens,
        uint256 amount,
        uint256 minReturn,
        uint256[] memory flags,
        bytes[] memory dataTx,
        bool isWrapper,
        address recipient
    ) public payable virtual returns (uint256 returnAmount);

    function getExpectedReturnETH(
        address srcStablefromtoken,
        uint256 srcStableFromTokenAmount,
        uint256 parts,
        uint256 flags
    ) public view virtual returns (uint256 returnAmount);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

interface IWETH {
    function deposit() external payable;

    function transfer(address to, uint256 value) external returns (bool);

    function withdraw(uint256) external;

    function transferFrom(address src, address dst, uint256 wad) external returns (bool);

    function approve(address guy, uint256 wad) external returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IBurnableERC20V2 is IERC20 {
    function mint(address account, uint256 amount) external;

    function burn(uint256 amount) external;

    function burnFrom(address account, uint256 amount) external;
}

interface IBurnableERC20V1 is IERC20 {
    function mint(address account, uint256 amount) external;

    function burn(address account, uint256 amount) external;
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity ^0.8.18;

/**
 * @title A contract that provides modifiers to prevent reentrancy to state-changing and view-only methods. This contract
 * is inspired by https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/ReentrancyGuard.sol
 * and https://github.com/balancer-labs/balancer-core/blob/master/contracts/BPool.sol.
 * @dev The reason why we use this local contract instead of importing from uma/contracts is because of the addition
 * of the internal method `functionCallStackOriginatesFromOutsideThisContract` which doesn't exist in the one exported
 * by uma/contracts.
 */
contract ReentrancyGuard {
    bool internal _notEntered;

    constructor() {
        // Storing an initial non-zero value makes deployment a bit more expensive, but in exchange the refund on every
        // call to nonReentrant will be lower in amount. Since refunds are capped to a percentage of the total
        // transaction's gas, it is best to keep them low in cases like this one, to increase the likelihood of the full
        // refund coming into effect.
        _notEntered = true;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a nonReentrant function from another nonReentrant function is not supported. It is possible to
     * prevent this from happening by making the nonReentrant function external, and making it call a private
     * function that does the actual state modification.
     */
    modifier nonReentrant() {
        _preEntranceCheck();
        _preEntranceSet();
        _;
        _postEntranceReset();
    }

    /**
     * @dev Designed to prevent a view-only method from being re-entered during a call to a nonReentrant() state-changing method.
     */
    modifier nonReentrantView() {
        _preEntranceCheck();
        _;
    }

    /**
     * @dev Returns true if the contract is currently in a non-entered state, meaning that the origination of the call
     * came from outside the contract. This is relevant with fallback/receive methods to see if the call came from ETH
     * being dropped onto the contract externally or due to ETH dropped on the the contract from within a method in this
     * contract, such as unwrapping WETH to ETH within the contract.
     */
    function functionCallStackOriginatesFromOutsideThisContract() internal view returns (bool) {
        return _notEntered;
    }

    // Internal methods are used to avoid copying the require statement's bytecode to every nonReentrant() method.
    // On entry into a function, _preEntranceCheck() should always be called to check if the function is being
    // re-entered. Then, if the function modifies state, it should call _postEntranceSet(), perform its logic, and
    // then call _postEntranceReset().
    // View-only methods can simply call _preEntranceCheck() to make sure that it is not being re-entered.
    function _preEntranceCheck() internal view {
        // On the first call to nonReentrant, _notEntered will be true
        require(_notEntered, "ReentrancyGuard: reentrant call");
    }

    function _preEntranceSet() internal {
        // Any calls to nonReentrant after this point will fail
        _notEntered = false;
    }

    function _postEntranceReset() internal {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _notEntered = true;
    }
}

// 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 (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

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

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

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// 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
pragma solidity >=0.8.0 <0.9.0;

library Utils {
    // This is used purely to avoid stack too deep errors
    // represents everything about a given validator set
    struct ValsetArgs {
        // the validators in this set, represented by an Ethereum address
        address[] validators;
        // the powers of the given validators in the same order as above
        uint64[] powers;
        // the nonce of this validator set
        uint256 valsetNonce;
    }

    struct RequestPayload {
        uint256 routeAmount;
        uint256 requestIdentifier;
        uint256 requestTimestamp;
        string srcChainId;
        address routeRecipient;
        string destChainId;
        address asmAddress;
        string requestSender;
        address handlerAddress;
        bytes packet;
        bool isReadCall;
    }

    struct CrossChainAckPayload {
        uint256 requestIdentifier;
        uint256 ackRequestIdentifier;
        string destChainId;
        address requestSender;
        bytes execData;
        bool execFlag;
    }

    enum AckType {
        NO_ACK,
        ACK_ON_SUCCESS,
        ACK_ON_ERROR,
        ACK_ON_BOTH
    }

    error IncorrectCheckpoint();
    error InvalidValsetNonce(uint256 newNonce, uint256 currentNonce);
    error MalformedNewValidatorSet();
    error MalformedCurrentValidatorSet();
    error InsufficientPower(uint64 cumulativePower, uint64 powerThreshold);
    error InvalidSignature();
    // constants
    string constant MSG_PREFIX = "\x19Ethereum Signed Message:\n32";
    // The number of 'votes' required to execute a valset
    // update or batch execution, set to 2/3 of 2^32
    uint64 constant CONSTANT_POWER_THRESHOLD = 2791728742;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/Math.sol";
import "./math/SignedMath.sol";

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `int256` to its ASCII `string` decimal representation.
     */
    function toString(int256 value) internal pure returns (string memory) {
        return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMath.abs(value))));
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }

    /**
     * @dev Returns true if the two strings are equal.
     */
    function equal(string memory a, string memory b) internal pure returns (bool) {
        return keccak256(bytes(a)) == keccak256(bytes(b));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// 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 (last updated v4.9.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

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

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

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

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

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

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

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

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

    /**
     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SignedMath.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard signed math utilities missing in the Solidity language.
 */
library SignedMath {
    /**
     * @dev Returns the largest of two signed numbers.
     */
    function max(int256 a, int256 b) internal pure returns (int256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two signed numbers.
     */
    function min(int256 a, int256 b) internal pure returns (int256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two signed numbers without overflow.
     * The result is rounded towards zero.
     */
    function average(int256 a, int256 b) internal pure returns (int256) {
        // Formula from the book "Hacker's Delight"
        int256 x = (a & b) + ((a ^ b) >> 1);
        return x + (int256(uint256(x) >> 255) & (a ^ b));
    }

    /**
     * @dev Returns the absolute unsigned value of a signed value.
     */
    function abs(int256 n) internal pure returns (uint256) {
        unchecked {
            // must be unchecked in order to support `n = type(int256).min`
            return uint256(n >= 0 ? n : -n);
        }
    }
}

// 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);
}

{
  "remappings": [
    "@ethereum-waffle/=node_modules/@ethereum-waffle/",
    "@openzeppelin/=node_modules/@openzeppelin/",
    "@routerprotocol/=node_modules/@routerprotocol/",
    "eth-gas-reporter/=node_modules/eth-gas-reporter/",
    "ethpm-registry/=node_modules/ethpm-registry/",
    "ethpm-spec/=node_modules/ethpm-spec/",
    "ethpm/=node_modules/ethpm/",
    "hardhat-deploy/=node_modules/hardhat-deploy/",
    "hardhat/=node_modules/hardhat/",
    "tronbox/=node_modules/tronbox/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_dexSpan","type":"address"},{"internalType":"address","name":"_wrappedNative","type":"address"},{"internalType":"address","name":"_gatewayAddress","type":"address"},{"internalType":"string","name":"chainId","type":"string"},{"internalType":"string","name":"routerBridgeAddress","type":"string"},{"internalType":"uint256","name":"startNonce","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"uint8","name":"codeId","type":"uint8"}],"name":"AssetBridgeError","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"destChainIdBytes","type":"bytes32"},{"indexed":true,"internalType":"uint256","name":"depositNonce","type":"uint256"},{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":false,"internalType":"address","name":"srcSettlementToken","type":"address"},{"indexed":false,"internalType":"uint256","name":"srcSettlementAmount","type":"uint256"}],"name":"DepositReverted","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint8","name":"executeType","type":"uint8"},{"indexed":true,"internalType":"bytes32","name":"sourceChainIdBytes","type":"bytes32"},{"indexed":true,"internalType":"uint256","name":"depositNonce","type":"uint256"},{"indexed":false,"internalType":"address","name":"settlementToken","type":"address"},{"indexed":false,"internalType":"uint256","name":"settlementAmount","type":"uint256"},{"indexed":false,"internalType":"address","name":"recipient","type":"address"}],"name":"Execute","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint8","name":"executeType","type":"uint8"},{"indexed":true,"internalType":"bytes32","name":"sourceChainIdBytes","type":"bytes32"},{"indexed":true,"internalType":"uint256","name":"depositNonce","type":"uint256"},{"indexed":false,"internalType":"address","name":"settlementToken","type":"address"},{"indexed":false,"internalType":"uint256","name":"settlementAmount","type":"uint256"},{"indexed":false,"internalType":"address","name":"recipient","type":"address"},{"indexed":false,"internalType":"bool","name":"flag","type":"bool"},{"indexed":false,"internalType":"bytes","name":"data","type":"bytes"}],"name":"ExecuteWithMessage","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Paused","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"role","type":"bytes32"},{"indexed":true,"internalType":"bytes32","name":"previousAdminRole","type":"bytes32"},{"indexed":true,"internalType":"bytes32","name":"newAdminRole","type":"bytes32"}],"name":"RoleAdminChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"role","type":"bytes32"},{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":true,"internalType":"address","name":"sender","type":"address"}],"name":"RoleGranted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"role","type":"bytes32"},{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":true,"internalType":"address","name":"sender","type":"address"}],"name":"RoleRevoked","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"destChainIdBytes","type":"bytes32"},{"indexed":true,"internalType":"address","name":"srcTokenAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"srcTokenAmount","type":"uint256"},{"indexed":false,"internalType":"bytes","name":"recipient","type":"bytes"},{"indexed":false,"internalType":"uint256","name":"partnerId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"depositId","type":"uint256"}],"name":"TokenTransfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"destChainIdBytes","type":"bytes32"},{"indexed":true,"internalType":"address","name":"srcTokenAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"srcTokenAmount","type":"uint256"},{"indexed":false,"internalType":"bytes","name":"recipient","type":"bytes"},{"indexed":false,"internalType":"uint256","name":"partnerId","type":"uint256"},{"indexed":false,"internalType":"uint64","name":"destGasLimit","type":"uint64"},{"indexed":false,"internalType":"bytes","name":"instruction","type":"bytes"},{"indexed":false,"internalType":"uint256","name":"depositId","type":"uint256"}],"name":"TokenTransferWithInstruction","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Unpaused","type":"event"},{"inputs":[],"name":"AssetBridge_REQUEST_METADATA","outputs":[{"internalType":"bytes","name":"","type":"bytes"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"DEFAULT_ADMIN_ROLE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"PAUSER","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"RESOURCE_SETTER","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ROUTER_BRIDGE_ADDRESS","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ROUTER_BRIDGE_ADDRESS_BYTES","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ROUTER_CHAIN_ID","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ROUTER_CHAIN_ID_BYTES","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"_contractToLP","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"_executionRevertCompleted","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"_lpToContract","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"_tokenWhitelist","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"depositNonce","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"dexSpan","outputs":[{"internalType":"contract IDexSpan","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"executeRecord","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"gateway","outputs":[{"internalType":"contract IGateway","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"}],"name":"getRoleAdmin","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"grantRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"hasRole","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"requestSender","type":"string"},{"internalType":"bytes","name":"packet","type":"bytes"},{"internalType":"string","name":"srcChainId","type":"string"}],"name":"iReceive","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"pause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"renounceRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"revokeRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"feePayer","type":"string"}],"name":"setDappMetadata","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"_dexSpan","type":"address"}],"name":"setDexSpanAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"_tokens","type":"address[]"},{"internalType":"address[]","name":"_lptokens","type":"address[]"}],"name":"setLiquidityPoolMulti","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"_tokens","type":"address[]"},{"internalType":"uint256[]","name":"types","type":"uint256[]"}],"name":"setWhiteListTokenMulti","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"bool","name":"isSourceNative","type":"bool"},{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"stake","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"bytes32","name":"destChainIdBytes","type":"bytes32"},{"internalType":"address[]","name":"tokens","type":"address[]"},{"internalType":"uint256[]","name":"flags","type":"uint256[]"},{"internalType":"bytes[]","name":"dataTx","type":"bytes[]"},{"internalType":"uint256","name":"srcTokenAmount","type":"uint256"},{"internalType":"uint256","name":"minToAmount","type":"uint256"},{"internalType":"bytes","name":"recipient","type":"bytes"},{"internalType":"uint256","name":"partnerId","type":"uint256"}],"internalType":"struct IAssetBridge.SwapTransferPayload","name":"transferPayload","type":"tuple"}],"name":"swapAndTransferToken","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"bytes32","name":"destChainIdBytes","type":"bytes32"},{"internalType":"address[]","name":"tokens","type":"address[]"},{"internalType":"uint256[]","name":"flags","type":"uint256[]"},{"internalType":"bytes[]","name":"dataTx","type":"bytes[]"},{"internalType":"uint256","name":"srcTokenAmount","type":"uint256"},{"internalType":"uint256","name":"minToAmount","type":"uint256"},{"internalType":"bytes","name":"recipient","type":"bytes"},{"internalType":"uint256","name":"partnerId","type":"uint256"}],"internalType":"struct IAssetBridge.SwapTransferPayload","name":"transferPayload","type":"tuple"},{"internalType":"uint64","name":"destGasLimit","type":"uint64"},{"internalType":"bytes","name":"instruction","type":"bytes"}],"name":"swapAndTransferTokenWithInstruction","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"bytes32","name":"destChainIdBytes","type":"bytes32"},{"internalType":"address","name":"srcTokenAddress","type":"address"},{"internalType":"uint256","name":"srcTokenAmount","type":"uint256"},{"internalType":"bytes","name":"recipient","type":"bytes"},{"internalType":"uint256","name":"partnerId","type":"uint256"}],"internalType":"struct IAssetBridge.TransferPayload","name":"transferPayload","type":"tuple"}],"name":"transferToken","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"bytes32","name":"destChainIdBytes","type":"bytes32"},{"internalType":"address","name":"srcTokenAddress","type":"address"},{"internalType":"uint256","name":"srcTokenAmount","type":"uint256"},{"internalType":"bytes","name":"recipient","type":"bytes"},{"internalType":"uint256","name":"partnerId","type":"uint256"}],"internalType":"struct IAssetBridge.TransferPayload","name":"transferPayload","type":"tuple"},{"internalType":"uint64","name":"destGasLimit","type":"uint64"},{"internalType":"bytes","name":"instruction","type":"bytes"}],"name":"transferTokenWithInstruction","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"bool","name":"isSourceNative","type":"bool"},{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"unstake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address payable","name":"recipient","type":"address"}],"name":"withdrawFunds","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"wrappedNative","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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

-----Decoded View---------------
Arg [0] : _dexSpan (address): 0x6A0fD5577c540e16A3A49C40b51E0880a2a528ce
Arg [1] : _wrappedNative (address): 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2
Arg [2] : _gatewayAddress (address): 0x86DFc31d9cB3280eE1eB1096caa9fC66299Af973
Arg [3] : chainId (string): router_9600-1
Arg [4] : routerBridgeAddress (string): router17p9rzwnnfxcjp32un9ug7yhhzgtkhvl9jfksztgw5uh69wac2pgsmpev85
Arg [5] : startNonce (uint256): 0

-----Encoded View---------------
12 Constructor Arguments found :
Arg [0] : 0000000000000000000000006a0fd5577c540e16a3a49c40b51e0880a2a528ce
Arg [1] : 000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2
Arg [2] : 00000000000000000000000086dfc31d9cb3280ee1eb1096caa9fc66299af973
Arg [3] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000100
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [6] : 000000000000000000000000000000000000000000000000000000000000000d
Arg [7] : 726f757465725f393630302d3100000000000000000000000000000000000000
Arg [8] : 0000000000000000000000000000000000000000000000000000000000000041
Arg [9] : 726f7574657231377039727a776e6e6678636a703332756e397567377968687a
Arg [10] : 67746b68766c396a666b737a7467773575683639776163327067736d70657638
Arg [11] : 3500000000000000000000000000000000000000000000000000000000000000