Contract Address Details

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.8;

import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol";
import "../interfaces/CrosschainFunctionCallInterface.sol";
import "./common/CbcDecVer.sol";
import "../interfaces/NonAtomicHiddenAuthParameters.sol";
import "./common/ResponseProcessUtil.sol";
import "../interfaces/IFuturesGateway.sol";

contract FuturesAdapter is
    CrosschainFunctionCallInterface,
    CbcDecVer,
    NonAtomicHiddenAuthParameters,
    ResponseProcessUtil,
    ReentrancyGuardUpgradeable,
    PausableUpgradeable
{
    // 	0x77dab611
    bytes32 internal constant CROSS_CALL_EVENT_SIGNATURE =
    keccak256("CrossCall(bytes32,uint256,address,uint256,address,bytes)");

    IFuturesGateway public futuresGateway;

    // How old events can be before they are not accepted.
    // Also used as a time after which crosschain transaction ids can be purged from the
    // replayProvention map, thus reducing the cost of the crosschain transaction.
    // Measured in seconds.
    uint256 public timeHorizon;

    // Used to prevent replay attacks in transaction.
    // Mapping of txId to transaction expiry time.
    mapping(bytes32 => uint256) public replayPrevention;

    uint256 public myBlockchainId;

    // Use to determine different transactions but have same calldata, block timestamp
    uint256 txIndex;

    /**
   * Crosschain Transaction event.
   *
   * @param _txId Crosschain Transaction id.
   * @param _timestamp The time when the event was generated.
   * @param _caller Contract or EOA that submitted the crosschain call on the source blockchain.
   * @param _destBcId Destination blockchain Id.
   * @param _destContract Contract to be called on the destination blockchain.
   * @param _destFunctionCall The function selector and parameters in ABI packed format.
   */
    event CrossCall(
        bytes32 _txId,
        uint256 _timestamp,
        address _caller,
        uint256 _destBcId,
        address _destContract,
        uint8 _destMethodID,
        bytes _destFunctionCall
    );

    event CallFailure(string _revertReason);

    /**
     * @param _myBlockchainId Blockchain identifier of this blockchain.
     * @param _timeHorizon How old crosschain events can be before they are
     *     deemed to be invalid. Measured in seconds.
     */
    function initialize(
        uint256 _myBlockchainId,
        uint256 _timeHorizon
    ) public initializer {
        __ReentrancyGuard_init();
        __Ownable_init();
        __Pausable_init();

        myBlockchainId = _myBlockchainId;
        timeHorizon = _timeHorizon;
    }

    function crossBlockchainCall(
    // NOTE: can keep using _destBcId and _destContract to determine which blockchain is calling
        uint256 _destBcId,
        address _destContract,
        uint8 _destMethodID,
        bytes calldata _destData
    ) external override {
        txIndex++;
        bytes32 txId = keccak256(
            abi.encodePacked(
                block.timestamp,
                myBlockchainId,
                _destBcId,
                _destContract,
                _destData,
                txIndex
            )
        );
        emit CrossCall(
            txId,
            block.timestamp,
            msg.sender,
            _destBcId,
            _destContract,
            _destMethodID,
            _destData
        );
    }

    // For server
    function crossCallHandler(
        uint256 _sourceBcId,
        address _cbcAddress,
        bytes calldata _eventData,
        bytes calldata _signature
    ) public {
        address relayer = msg.sender;
        decodeAndVerifyEvent(
            _sourceBcId,
            _cbcAddress,
            CROSS_CALL_EVENT_SIGNATURE,
            _eventData,
            _signature,
            relayer
        );

        // Decode _eventData
        // Recall that the cross call event is:
        // CrossCall(bytes32 _txId, uint256 _timestamp, address _caller,
        //           uint256 _destBcId, address _destContract, bytes _destFunctionCall)
        bytes32 txId;
        uint256 timestamp;
        address caller;
        uint256 destBcId;
        address destContract;
        bytes memory functionCall;
        (txId, timestamp, caller, destBcId, destContract, functionCall) = abi
        .decode(
            _eventData,
            (bytes32, uint256, address, uint256, address, bytes)
        );

        require(replayPrevention[txId] == 0, "Transaction already exists");

        require(
            timestamp < block.timestamp,
            "Event timestamp is in the future"
        );
        require(timestamp + timeHorizon > block.timestamp, "Event is too old");
        replayPrevention[txId] = timestamp;

        require(
            destBcId == myBlockchainId,
            "Incorrect destination blockchain id"
        );

        // Add authentication information to the function call.
        bytes memory functionCallWithAuth = encodeNonAtomicAuthParams(
            functionCall,
            _sourceBcId,
            caller
        );

        bool isSuccess;
        bytes memory returnValueEncoded;
        (isSuccess, returnValueEncoded) = destContract.call(
            functionCallWithAuth
        );
        require(isSuccess, getRevertMsg(returnValueEncoded));
    }

    //TODO implement
    function withdraw(
        address _manager,
        address _trader,
        uint256 _amount
    ) internal {
        futuresGateway.withdraw(_manager, _trader, _amount);
    }

    function updateFuturesGateway(address _address) external onlyOwner {
        futuresGateway = IFuturesGateway(_address);
    }
}
        

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

interface ILightClient {
    /**
     * Decode and verify event information. Use require to fail the transaction
     * if any of the information is invalid.
     *
     * @param _blockchainId The blockchain that emitted the event. This could be
     *    used to determine which sets of signing keys are valid.
     * @param _eventSig The event function selector. This will be for a Start event,
     *    a Segment event, or a Root event. Not all implementations will need to
     *    use this value. Others may need this to allow then to find the event in a
     *    transaction receipt.
     * @param _payload The abi.encodePacked of the blockchain id, the Crosschain
     *    Control contract's address, the event function selector, and the event data.
     * @param _signature Signatures or proof information that an implementation can
     *    use to check that _signedEventInfo is valid.
     */
    function decodeAndVerifyEvent(
        uint256 _blockchainId,
        bytes32 _eventSig,
        bytes calldata _payload,
        bytes calldata _signature,
        address _relayer
    ) external view;
}
          

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

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal onlyInitializing {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts. Equivalent to `reinitializer(1)`.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * `initializer` is equivalent to `reinitializer(1)`, so a reinitializer may be used after the original
     * initialization step. This is essential to configure modules that are added through upgrades and that require
     * initialization.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized < type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }
}
          

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

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.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 PausableUpgradeable is Initializable, ContextUpgradeable {
    /**
     * @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.
     */
    function __Pausable_init() internal onlyInitializing {
        __Pausable_init_unchained();
    }

    function __Pausable_init_unchained() internal onlyInitializing {
        _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());
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuardUpgradeable is Initializable {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being 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.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    function __ReentrancyGuard_init() internal onlyInitializing {
        __ReentrancyGuard_init_unchained();
    }

    function __ReentrancyGuard_init_unchained() internal onlyInitializing {
        _status = _NOT_ENTERED;
    }

    /**
     * @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 work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}
          

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

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @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
     * ====
     *
     * [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://diligence.consensys.net/posts/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/v0.5.11/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 functionCall(target, data, "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");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason 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 {
            // 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 v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";

/**
 * @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 ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
    }

    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

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

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}
          

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

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_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) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @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] = _HEX_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);
    }
}
          

/*
 * Copyright 2021 ConsenSys Software Inc
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
pragma solidity >=0.8;

/**
 * Crosschain Function Call Interface allows applications to call functions on other blockchains
 * and to get information about the currently executing function call.
 *
 */
interface CrosschainFunctionCallInterface {
    /**
     * Call a function on another blockchain. All function call implementations must implement
     * this function.
     *
     * @param _bcId Blockchain identifier of blockchain to be called.
     * @param _contract The address of the contract to be called.
     * @param _functionCallData The function selector and parameter data encoded using ABI encoding rules.
     */
    function crossBlockchainCall(
        uint256 _bcId,
        address _contract,
        uint8 _destMethodID,
        bytes calldata _functionCallData
    ) external;
}
          

pragma solidity ^0.8.0;

interface IFuturesGateway {
    function withdraw(address manager, address trader, uint256 amount) external;
}
          

/*
 * Copyright 2021 ConsenSys AG.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
pragma solidity >=0.8;

abstract contract NonAtomicHiddenAuthParameters {
    /**
     * Add authentication parameters to the end of an existing function call.
     *
     * @param _functionCall       Function selector and an arbitrary list of parameters.
     * @param _sourceBlockchainId Blockchain identifier of the blockchain that is calling the function.
     * @param _sourceContract     The address of the contract that is calling the function.
     */
    function encodeNonAtomicAuthParams(
        bytes memory _functionCall,
        uint256 _sourceBlockchainId,
        address _sourceContract
    ) internal pure returns (bytes memory) {
        return
            bytes.concat(
                _functionCall,
                abi.encodePacked(_sourceBlockchainId, _sourceContract)
            );
    }

    /**
     * Extract authentication values from the end of the call data. The parameters are expected to have been
     * added to the end of the function call using encodeNonAtomicAuthParams.
     *
     * @return _sourceBlockchainId Blockchain identifier of the blockchain that is calling the function.
     * @return _sourceContract     The address of the contract that is calling the function.
     */
    function decodeNonAtomicAuthParams()
        internal
        pure
        returns (uint256 _sourceBlockchainId, address _sourceContract)
    {
        bytes calldata allParams = msg.data;
        uint256 len = allParams.length;

        assembly {
            calldatacopy(0x0, sub(len, 52), 32)
            _sourceBlockchainId := mload(0)
            calldatacopy(12, sub(len, 20), 20)
            _sourceContract := mload(0)
        }
    }
}
          

/*
 * Copyright 2021 ConsenSys Software Inc
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
pragma solidity >=0.8;

import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "../../interfaces/ILightClient.sol";

abstract contract CbcDecVer is OwnableUpgradeable{
    // Address of verifier contract to be used for a certain blockchain id.
    mapping(uint256 => ILightClient) private verifiers;

    // Address of Crosschain Control Contract on another blockchain.
    mapping(uint256 => address) internal remoteFuturesAdapterContracts;

    function addVerifier(uint256 _blockchainId, address _verifier)
        external
        onlyOwner
    {
        require(_blockchainId != 0, "Invalid blockchain id");
        require(_verifier != address(0), "Invalid verifier address");
        verifiers[_blockchainId] = ILightClient(_verifier);
    }

    function addRemoteFuturesAdapter(uint256 _blockchainId, address _cbc)
        external
        onlyOwner
    {
        remoteFuturesAdapterContracts[_blockchainId] = _cbc;
    }

    /**
     * Decode signatures or proofs and use them to verify an event.
     *
     * @param _blockchainId The blockchain that the event was emitted on.
     * @param _cbcAddress The Crosschain Control Contract that emitted the event.
     * @param _eventFunctionSignature The function selector of the event that emitted the event.
     * @param _eventData The emitted event data.
     * @param _signature The signature of proof across the ABI encoded combination of:
     *            _blockchainId, _cbcAddress, _eventFunctionSignature, and _signature.
     */
    function decodeAndVerifyEvent(
        uint256 _blockchainId,
        address _cbcAddress,
        bytes32 _eventFunctionSignature,
        bytes calldata _eventData,
        bytes calldata _signature,
        address _relayer
    ) internal view {
        // This indirectly checks that _blockchainId is an authorised source blockchain
        // by checking that there is a verifier for the blockchain.
        // TODO implment when deploy production
        ILightClient verifier = verifiers[_blockchainId];
        require(
            address(verifier) != address(0),
            "No registered verifier for blockchain"
        );

        require(
            _cbcAddress == remoteFuturesAdapterContracts[_blockchainId],
            "Data not emitted by approved contract"
        );

        bytes memory encodedEvent = abi.encodePacked(
            _blockchainId,
            _cbcAddress,
            _eventFunctionSignature,
            _eventData
        );
        verifier.decodeAndVerifyEvent(
            _blockchainId,
            _eventFunctionSignature,
            encodedEvent,
            _signature,
            _relayer
        );
    }
}
          

/*
 * Copyright 2020 ConsenSys Software Inc
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
pragma solidity >=0.7.1;

import "@openzeppelin/contracts/utils/Strings.sol";

abstract contract ResponseProcessUtil {
    function getRevertMsg(bytes memory _returnData)
        internal
        pure
        returns (string memory)
    {
        // A string will be 4 bytes for the function selector + 32 bytes for string length +
        // 32 bytes for first part of string. Hence, if the length is less than 68, then
        // this is a panic.
        // Another way of doing this would be to look for the function selectors for revert:
        // "0x08c379a0" = keccak256("Error(string)"
        // or panic:
        // "0x4e487b71" = keccak256("Panic(uint256)"
        if (_returnData.length < 36) {
            return
                string(
                    abi.encodePacked(
                        "Revert for unknown error. Error length: ",
                        Strings.toString(_returnData.length)
                    )
                );
        }
        bool isPanic = _returnData.length < 68;

        assembly {
            // Remove the function selector / sighash.
            _returnData := add(_returnData, 0x04)
        }
        if (isPanic) {
            uint256 errorCode = abi.decode(_returnData, (uint256));
            return
                string(
                    abi.encodePacked("Panic: ", Strings.toString(errorCode))
                );
        }
        return abi.decode(_returnData, (string)); // All that remains is the revert string
    }
}