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// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;

import "./interfaces/AdapterInterface.sol";
import "../external/interfaces/WETH9Interface.sol";

// @dev Use local modified CrossDomainEnabled contract instead of one exported by eth-optimism because we need
// this contract's state variables to be `immutable` because of the delegateCall call.
import "./CrossDomainEnabled.sol";
import "@eth-optimism/contracts/L1/messaging/IL1StandardBridge.sol";

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

/**
 * @notice Interface for Synthetix custom bridge to Optimism.
 */
interface SynthetixBridgeToOptimism is IL1StandardBridge {
    /**
     * @notice Send tokens to Optimism.
     * @param to Address to send tokens to on L2.
     * @param amount Amount of tokens to send.
     */
    function depositTo(address to, uint256 amount) external;
}

/**
 * @notice Contract containing logic to send messages from L1 to Optimism.
 * @dev Public functions calling external contracts do not guard against reentrancy because they are expected to be
 * called via delegatecall, which will execute this contract's logic within the context of the originating contract.
 * For example, the HubPool will delegatecall these functions, therefore it's only necessary that the HubPool's methods
 * that call this contract's logic guard against reentrancy.
 */

// solhint-disable-next-line contract-name-camelcase
contract Optimism_Adapter is CrossDomainEnabled, AdapterInterface {
    using SafeERC20 for IERC20;
    uint32 public immutable l2GasLimit = 200_000;

    WETH9Interface public immutable l1Weth;

    IL1StandardBridge public immutable l1StandardBridge;

    // Optimism has the ability to support "custom" bridges. These bridges are not supported by the canonical bridge
    // and so we need to store the address of the custom token and the associated bridge. In the event we want to
    // support a new token that is not supported by Optimism, we can add a new custom bridge for it and re-deploy the
    // adapter. A full list of custom optimism tokens and their associated bridges can be found here:
    // https://github.com/ethereum-optimism/ethereum-optimism.github.io/blob/master/optimism.tokenlist.json
    address public immutable dai = 0x6B175474E89094C44Da98b954EedeAC495271d0F;
    address public immutable daiOptimismBridge = 0x10E6593CDda8c58a1d0f14C5164B376352a55f2F;
    address public immutable snx = 0xC011a73ee8576Fb46F5E1c5751cA3B9Fe0af2a6F;
    address public immutable snxOptimismBridge = 0x39Ea01a0298C315d149a490E34B59Dbf2EC7e48F;

    /**
     * @notice Constructs new Adapter.
     * @param _l1Weth WETH address on L1.
     * @param _crossDomainMessenger XDomainMessenger Optimism system contract.
     * @param _l1StandardBridge Standard bridge contract.
     */
    constructor(
        WETH9Interface _l1Weth,
        address _crossDomainMessenger,
        IL1StandardBridge _l1StandardBridge
    ) CrossDomainEnabled(_crossDomainMessenger) {
        l1Weth = _l1Weth;
        l1StandardBridge = _l1StandardBridge;
    }

    /**
     * @notice Send cross-chain message to target on Optimism.
     * @param target Contract on Optimism that will receive message.
     * @param message Data to send to target.
     */
    function relayMessage(address target, bytes calldata message) external payable override {
        sendCrossDomainMessage(target, uint32(l2GasLimit), message);
        emit MessageRelayed(target, message);
    }

    /**
     * @notice Bridge tokens to Optimism.
     * @param l1Token L1 token to deposit.
     * @param l2Token L2 token to receive.
     * @param amount Amount of L1 tokens to deposit and L2 tokens to receive.
     * @param to Bridge recipient.
     */
    function relayTokens(
        address l1Token,
        address l2Token,
        uint256 amount,
        address to
    ) external payable override {
        // If the l1Token is weth then unwrap it to ETH then send the ETH to the standard bridge.
        if (l1Token == address(l1Weth)) {
            l1Weth.withdraw(amount);
            l1StandardBridge.depositETHTo{ value: amount }(to, l2GasLimit, "");
        } else {
            address bridgeToUse = address(l1StandardBridge);

            // Check if the L1 token requires a custom bridge. If so, use that bridge over the standard bridge.
            if (l1Token == dai) bridgeToUse = daiOptimismBridge; // 1. DAI
            if (l1Token == snx) bridgeToUse = snxOptimismBridge; // 2. SNX

            IERC20(l1Token).safeIncreaseAllowance(bridgeToUse, amount);
            if (l1Token == snx) SynthetixBridgeToOptimism(bridgeToUse).depositTo(to, amount);
            else IL1StandardBridge(bridgeToUse).depositERC20To(l1Token, l2Token, to, amount, l2GasLimit, "");
        }
        emit TokensRelayed(l1Token, l2Token, amount, to);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >0.5.0 <0.9.0;

/**
 * @title IL1ERC20Bridge
 */
interface IL1ERC20Bridge {
    /**********
     * Events *
     **********/

    event ERC20DepositInitiated(
        address indexed _l1Token,
        address indexed _l2Token,
        address indexed _from,
        address _to,
        uint256 _amount,
        bytes _data
    );

    event ERC20WithdrawalFinalized(
        address indexed _l1Token,
        address indexed _l2Token,
        address indexed _from,
        address _to,
        uint256 _amount,
        bytes _data
    );

    /********************
     * Public Functions *
     ********************/

    /**
     * @dev get the address of the corresponding L2 bridge contract.
     * @return Address of the corresponding L2 bridge contract.
     */
    function l2TokenBridge() external returns (address);

    /**
     * @dev deposit an amount of the ERC20 to the caller's balance on L2.
     * @param _l1Token Address of the L1 ERC20 we are depositing
     * @param _l2Token Address of the L1 respective L2 ERC20
     * @param _amount Amount of the ERC20 to deposit
     * @param _l2Gas Gas limit required to complete the deposit on L2.
     * @param _data Optional data to forward to L2. This data is provided
     *        solely as a convenience for external contracts. Aside from enforcing a maximum
     *        length, these contracts provide no guarantees about its content.
     */
    function depositERC20(
        address _l1Token,
        address _l2Token,
        uint256 _amount,
        uint32 _l2Gas,
        bytes calldata _data
    ) external;

    /**
     * @dev deposit an amount of ERC20 to a recipient's balance on L2.
     * @param _l1Token Address of the L1 ERC20 we are depositing
     * @param _l2Token Address of the L1 respective L2 ERC20
     * @param _to L2 address to credit the withdrawal to.
     * @param _amount Amount of the ERC20 to deposit.
     * @param _l2Gas Gas limit required to complete the deposit on L2.
     * @param _data Optional data to forward to L2. This data is provided
     *        solely as a convenience for external contracts. Aside from enforcing a maximum
     *        length, these contracts provide no guarantees about its content.
     */
    function depositERC20To(
        address _l1Token,
        address _l2Token,
        address _to,
        uint256 _amount,
        uint32 _l2Gas,
        bytes calldata _data
    ) external;

    /*************************
     * Cross-chain Functions *
     *************************/

    /**
     * @dev Complete a withdrawal from L2 to L1, and credit funds to the recipient's balance of the
     * L1 ERC20 token.
     * This call will fail if the initialized withdrawal from L2 has not been finalized.
     *
     * @param _l1Token Address of L1 token to finalizeWithdrawal for.
     * @param _l2Token Address of L2 token where withdrawal was initiated.
     * @param _from L2 address initiating the transfer.
     * @param _to L1 address to credit the withdrawal to.
     * @param _amount Amount of the ERC20 to deposit.
     * @param _data Data provided by the sender on L2. This data is provided
     *   solely as a convenience for external contracts. Aside from enforcing a maximum
     *   length, these contracts provide no guarantees about its content.
     */
    function finalizeERC20Withdrawal(
        address _l1Token,
        address _l2Token,
        address _from,
        address _to,
        uint256 _amount,
        bytes calldata _data
    ) external;
}

// SPDX-License-Identifier: MIT
pragma solidity >0.5.0 <0.9.0;

import "./IL1ERC20Bridge.sol";

/**
 * @title IL1StandardBridge
 */
interface IL1StandardBridge is IL1ERC20Bridge {
    /**********
     * Events *
     **********/
    event ETHDepositInitiated(
        address indexed _from,
        address indexed _to,
        uint256 _amount,
        bytes _data
    );

    event ETHWithdrawalFinalized(
        address indexed _from,
        address indexed _to,
        uint256 _amount,
        bytes _data
    );

    /********************
     * Public Functions *
     ********************/

    /**
     * @dev Deposit an amount of the ETH to the caller's balance on L2.
     * @param _l2Gas Gas limit required to complete the deposit on L2.
     * @param _data Optional data to forward to L2. This data is provided
     *        solely as a convenience for external contracts. Aside from enforcing a maximum
     *        length, these contracts provide no guarantees about its content.
     */
    function depositETH(uint32 _l2Gas, bytes calldata _data) external payable;

    /**
     * @dev Deposit an amount of ETH to a recipient's balance on L2.
     * @param _to L2 address to credit the withdrawal to.
     * @param _l2Gas Gas limit required to complete the deposit on L2.
     * @param _data Optional data to forward to L2. This data is provided
     *        solely as a convenience for external contracts. Aside from enforcing a maximum
     *        length, these contracts provide no guarantees about its content.
     */
    function depositETHTo(
        address _to,
        uint32 _l2Gas,
        bytes calldata _data
    ) external payable;

    /*************************
     * Cross-chain Functions *
     *************************/

    /**
     * @dev Complete a withdrawal from L2 to L1, and credit funds to the recipient's balance of the
     * L1 ETH token. Since only the xDomainMessenger can call this function, it will never be called
     * before the withdrawal is finalized.
     * @param _from L2 address initiating the transfer.
     * @param _to L1 address to credit the withdrawal to.
     * @param _amount Amount of the ERC20 to deposit.
     * @param _data Optional data to forward to L2. This data is provided
     *        solely as a convenience for external contracts. Aside from enforcing a maximum
     *        length, these contracts provide no guarantees about its content.
     */
    function finalizeETHWithdrawal(
        address _from,
        address _to,
        uint256 _amount,
        bytes calldata _data
    ) external;
}

// SPDX-License-Identifier: MIT
pragma solidity >0.5.0 <0.9.0;

/**
 * @title ICrossDomainMessenger
 */
interface ICrossDomainMessenger {
    /**********
     * Events *
     **********/

    event SentMessage(
        address indexed target,
        address sender,
        bytes message,
        uint256 messageNonce,
        uint256 gasLimit
    );
    event RelayedMessage(bytes32 indexed msgHash);
    event FailedRelayedMessage(bytes32 indexed msgHash);

    /*************
     * Variables *
     *************/

    function xDomainMessageSender() external view returns (address);

    /********************
     * Public Functions *
     ********************/

    /**
     * Sends a cross domain message to the target messenger.
     * @param _target Target contract address.
     * @param _message Message to send to the target.
     * @param _gasLimit Gas limit for the provided message.
     */
    function sendMessage(
        address _target,
        bytes calldata _message,
        uint32 _gasLimit
    ) external;
}

// 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) (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. Compatible with tokens that require the approval to be set to
     * 0 before setting it to a non-zero value.
     */
    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/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
pragma solidity ^0.8.0;

/* Interface Imports */
import { ICrossDomainMessenger } from "@eth-optimism/contracts/libraries/bridge/ICrossDomainMessenger.sol";

/**
 * @title CrossDomainEnabled
 * @dev Helper contract for contracts performing cross-domain communications between L1 and Optimism.
 * @dev This modifies the eth-optimism/CrossDomainEnabled contract only by changing state variables to be
 * immutable for use in contracts like the Optimism_Adapter which use delegateCall().
 */
contract CrossDomainEnabled {
    // Messenger contract used to send and recieve messages from the other domain.
    address public immutable messenger;

    /**
     * @param _messenger Address of the CrossDomainMessenger on the current layer.
     */
    constructor(address _messenger) {
        messenger = _messenger;
    }

    /**
     * Enforces that the modified function is only callable by a specific cross-domain account.
     * @param _sourceDomainAccount The only account on the originating domain which is
     *  authenticated to call this function.
     */
    modifier onlyFromCrossDomainAccount(address _sourceDomainAccount) {
        require(msg.sender == address(getCrossDomainMessenger()), "invalid cross domain messenger");

        require(
            getCrossDomainMessenger().xDomainMessageSender() == _sourceDomainAccount,
            "invalid cross domain sender"
        );

        _;
    }

    /**
     * Gets the messenger, usually from storage. This function is exposed in case a child contract
     * needs to override.
     * @return The address of the cross-domain messenger contract which should be used.
     */
    function getCrossDomainMessenger() internal virtual returns (ICrossDomainMessenger) {
        return ICrossDomainMessenger(messenger);
    }

    /**
     * Sends a message to an account on another domain
     * @param _crossDomainTarget The intended recipient on the destination domain
     * @param _message The data to send to the target (usually calldata to a function with
     *  onlyFromCrossDomainAccount())
     * @param _gasLimit The gasLimit for the receipt of the message on the target domain.
     */
    function sendCrossDomainMessage(
        address _crossDomainTarget,
        uint32 _gasLimit,
        bytes calldata _message
    ) internal {
        // slither-disable-next-line reentrancy-events, reentrancy-benign
        getCrossDomainMessenger().sendMessage(_crossDomainTarget, _message, _gasLimit);
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;

/**
 * @notice Sends cross chain messages and tokens to contracts on a specific L2 network.
 * This interface is implemented by an adapter contract that is deployed on L1.
 */

interface AdapterInterface {
    event MessageRelayed(address target, bytes message);

    event TokensRelayed(address l1Token, address l2Token, uint256 amount, address to);

    /**
     * @notice Send message to `target` on L2.
     * @dev This method is marked payable because relaying the message might require a fee
     * to be paid by the sender to forward the message to L2. However, it will not send msg.value
     * to the target contract on L2.
     * @param target L2 address to send message to.
     * @param message Message to send to `target`.
     */
    function relayMessage(address target, bytes calldata message) external payable;

    /**
     * @notice Send `amount` of `l1Token` to `to` on L2. `l2Token` is the L2 address equivalent of `l1Token`.
     * @dev This method is marked payable because relaying the message might require a fee
     * to be paid by the sender to forward the message to L2. However, it will not send msg.value
     * to the target contract on L2.
     * @param l1Token L1 token to bridge.
     * @param l2Token L2 token to receive.
     * @param amount Amount of `l1Token` to bridge.
     * @param to Bridge recipient.
     */
    function relayTokens(
        address l1Token,
        address l2Token,
        uint256 amount,
        address to
    ) external payable;
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;

/**
 * @notice Interface for the WETH9 contract.
 */
interface WETH9Interface {
    /**
     * @notice Burn Wrapped Ether and receive native Ether.
     * @param wad Amount of WETH to unwrap and send to caller.
     */
    function withdraw(uint256 wad) external;

    /**
     * @notice Lock native Ether and mint Wrapped Ether ERC20
     * @dev msg.value is amount of Wrapped Ether to mint/Ether to lock.
     */
    function deposit() external payable;

    /**
     * @notice Get balance of WETH held by `guy`.
     * @param guy Address to get balance of.
     * @return wad Amount of WETH held by `guy`.
     */
    function balanceOf(address guy) external view returns (uint256 wad);

    /**
     * @notice Transfer `wad` of WETH from caller to `guy`.
     * @param guy Address to send WETH to.
     * @param wad Amount of WETH to send.
     * @return ok True if transfer succeeded.
     */
    function transfer(address guy, uint256 wad) external returns (bool);
}

{
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "remappings": [],
  "viaIR": true,
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"contract WETH9Interface","name":"_l1Weth","type":"address"},{"internalType":"address","name":"_crossDomainMessenger","type":"address"},{"internalType":"contract IL1StandardBridge","name":"_l1StandardBridge","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"target","type":"address"},{"indexed":false,"internalType":"bytes","name":"message","type":"bytes"}],"name":"MessageRelayed","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"l1Token","type":"address"},{"indexed":false,"internalType":"address","name":"l2Token","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"address","name":"to","type":"address"}],"name":"TokensRelayed","type":"event"},{"inputs":[],"name":"dai","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"daiOptimismBridge","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"l1StandardBridge","outputs":[{"internalType":"contract IL1StandardBridge","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"l1Weth","outputs":[{"internalType":"contract WETH9Interface","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"l2GasLimit","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"messenger","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"target","type":"address"},{"internalType":"bytes","name":"message","type":"bytes"}],"name":"relayMessage","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"l1Token","type":"address"},{"internalType":"address","name":"l2Token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"to","type":"address"}],"name":"relayTokens","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"snx","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"snxOptimismBridge","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc200000000000000000000000025ace71c97b33cc4729cf772ae268934f7ab5fa100000000000000000000000099c9fc46f92e8a1c0dec1b1747d010903e884be1

-----Decoded View---------------
Arg [0] : _l1Weth (address): 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2
Arg [1] : _crossDomainMessenger (address): 0x25ace71c97B33Cc4729CF772ae268934F7ab5fA1
Arg [2] : _l1StandardBridge (address): 0x99C9fc46f92E8a1c0deC1b1747d010903E884bE1

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2
Arg [1] : 00000000000000000000000025ace71c97b33cc4729cf772ae268934f7ab5fa1
Arg [2] : 00000000000000000000000099c9fc46f92e8a1c0dec1b1747d010903e884be1